{"id":8086,"date":"2026-09-15T10:00:00","date_gmt":"2026-09-15T02:00:00","guid":{"rendered":"https:\/\/maxtormetal.com\/?p=8086"},"modified":"2026-10-27T19:50:04","modified_gmt":"2026-10-27T11:50:04","slug":"rotary-knife-overlap-settings-clean-edge-quality-slitting","status":"publish","type":"post","link":"https:\/\/maxtormetal.com\/fr\/rotary-knife-overlap-settings-clean-edge-quality-slitting\/","title":{"rendered":"Regolazione della Sovrapposizione delle Lame Circolari: Meccanica di Taglio, Finestre Materiale e Controllo Albero"},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"790\" height=\"706\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247211.jpg\" alt=\"Regolazione della Sovrapposizione delle Lame Circolari: Meccanica di Taglio, Finestre Materiale e Controllo Albero\" class=\"wp-image-4851\" style=\"width:580px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247211.jpg 790w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247211-300x268.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247211-768x686.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247211-13x12.jpg 13w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247211-600x536.jpg 600w\" sizes=\"(max-width: 790px) 100vw, 790px\" \/><\/figure><\/div><p>Dans le traitement continu des bobines m\u00e9talliques, l'obtention d'un bord propre, d'\u00e9querre et sans bavure constitue le crit\u00e8re principal d'une ligne de longitudinalage bien calibr\u00e9e. Derri\u00e8re chaque campagne de coupe \u00e0 haut rendement se trouvent deux param\u00e8tres g\u00e9om\u00e9triques critiques r\u00e9gissant la qualit\u00e9 du cisaillage : le jeu lat\u00e9ral horizontal et le recouvrement vertical des couteaux circulaires. Alors que le jeu horizontal r\u00e9git la concentration des contraintes sur la largeur de la bande, le recouvrement vertical d\u00e9termine la profondeur exacte de p\u00e9n\u00e9tration du couteau n\u00e9cessaire pour faire passer proprement le m\u00e9tal de la d\u00e9formation plastique \u00e0 une fracture contr\u00f4l\u00e9e.<\/p><p>L'importance op\u00e9rationnelle du recouvrement des couteaux circulaires ne saurait \u00eatre sous-estim\u00e9e. Le r\u00e9glage d'un recouvrement vertical correct minimise la hauteur des bavures, pr\u00e9serve la g\u00e9om\u00e9trie du bord de coupe et prolonge consid\u00e9rablement la dur\u00e9e de vie du couteau. \u00c0 l'inverse, un mauvais r\u00e9glage du recouvrement entra\u00eene le d\u00e9chirement des rives, une formation excessive de bavures, un \u00e9br\u00e9chage pr\u00e9matur\u00e9 de la lame, la production de rebuts et des arr\u00eats de ligne co\u00fbteux.<\/p><p>Pour les superviseurs de lignes de longitudinalage, les ing\u00e9nieurs proc\u00e9d\u00e9s et les directeurs d'usine, la ma\u00eetrise du calibrage du recouvrement est essentielle pour respecter des tol\u00e9rances de rives strictes. Les op\u00e9rateurs d'\u00e9quipements peuvent \u00e9liminer les approximations, prot\u00e9ger le stock de bobines \u00e0 haute valeur ajout\u00e9e et obtenir une qualit\u00e9 de bord constante et r\u00e9p\u00e9table sur diverses nuances de mat\u00e9riaux en d\u00e9ployant des protocoles d'ajustement dynamiques adapt\u00e9s au mat\u00e9riau aux c\u00f4t\u00e9s d'outillages rectifi\u00e9s de pr\u00e9cision.<\/p><p>Maxtor Metal&nbsp;designs and manufactures rotary slitting knives and arbor spacers to the dimensional tolerances this guide describes \u2014 including OD concentricity, face flatness, and hardness consistency across a full knife set \u2014 so that overlap settings made on paper translate directly to stable cut behavior on the line.<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Ce guide couvre<\/strong><br>Une r\u00e9f\u00e9rence technique et de r\u00e9glage pour le recouvrement vertical des couteaux circulaires en longitudinalage de bobines : pourquoi la profondeur de p\u00e9n\u00e9tration contr\u00f4le l'amor\u00e7age de la rupture, comment le recouvrement interagit avec le jeu horizontal pour d\u00e9terminer le ratio zone cisaill\u00e9e\/zone de rupture, les plages de d\u00e9part sp\u00e9cifiques selon le mat\u00e9riau pour l'acier au carbone, les AHSS, l'aluminium et l'acier inoxydable, et comment les syst\u00e8mes automatis\u00e9s de positionnement d'arbre maintiennent \u2014 ou perdent \u2014 un r\u00e9glage de recouvrement stable tout au long d'un cycle de production.<\/p><\/blockquote><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Who it\u2019s for<\/strong><br>Ing\u00e9nieurs proc\u00e9d\u00e9s d\u00e9finissant ou contr\u00f4lant le recouvrement pour une nouvelle nuance de mat\u00e9riau ou d'\u00e9paisseur ; responsables de maintenance r\u00e9solvant les probl\u00e8mes de bavures de rive et d'usure des couteaux li\u00e9s aux erreurs de p\u00e9n\u00e9tration ; op\u00e9rateurs d'\u00e9quipements calibrant les syst\u00e8mes automatis\u00e9s de positionnement d'arbre apr\u00e8s un rechargement\/aff\u00fbtage ; et responsables d'achats techniques \u00e9valuant les sp\u00e9cifications dimensionnelles des couteaux qui impactent la stabilit\u00e9 du recouvrement.<\/p><\/blockquote><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Comment l'utiliser sur une ligne en production :<\/strong>&nbsp;Commencez avec le tableau de recouvrement sp\u00e9cifique au mat\u00e9riau comme ligne de base \u2192 V\u00e9rifiez l'alignement de l'arbre et le diam\u00e8tre ext\u00e9rieur (OD) du couteau avant d'ajuster la p\u00e9n\u00e9tration \u2192 Effectuez une seule modification \u00e0 la fois et lancez une bande de v\u00e9rification courte \u2192 Consignez le r\u00e9sultat par rapport \u00e0 la plage d'acceptation des bavures avant de passer \u00e0 la vitesse de production.<\/p><\/blockquote><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Indicateurs cl\u00e9s \u00e0 suivre<\/strong><br><strong>Burr height<\/strong>&nbsp;as % of strip thickness at steady-state production speed \u00b7&nbsp;<strong>Burnish\/break ratio<\/strong>&nbsp;on the cut face (target ~1:2 to 1:3 for standard carbon steel) \u00b7&nbsp;<strong>Knife OD after each regrind<\/strong>&nbsp;(to recalculate required arbor height correction) \u00b7&nbsp;<strong>Edge condition at 30\u201350\u00d7<\/strong>&nbsp;after changeover and after speed ramp<\/p><\/blockquote><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Point de rep\u00e8re cl\u00e9 :<\/strong>&nbsp;La d\u00e9rive du recouvrement est presque toujours un probl\u00e8me dimensionnel \u2014 variation du diam\u00e8tre ext\u00e9rieur du couteau apr\u00e8s aff\u00fbtage, usure des entretoises ou flexion de l'arbre \u2014 et non une d\u00e9faillance du syst\u00e8me de commande. Corrigez la dimension, pas le r\u00e9glage.<\/p><\/blockquote><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h2 class=\"wp-block-heading\" id=\"db1d5e35-9d6d-4a05-855f-f6899b7dc2fe\">La Science du Recouvrement des Couteaux Circulaires<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"790\" height=\"626\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247311.jpg\" alt=\"La Science du Recouvrement des Couteaux Circulaires\" class=\"wp-image-4852\" style=\"width:612px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247311.jpg 790w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247311-300x238.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247311-768x609.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247311-15x12.jpg 15w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/\u5200\u7247311-600x475.jpg 600w\" sizes=\"(max-width: 790px) 100vw, 790px\" \/><\/figure><\/div><p>Rotary knife overlap (frequently termed penetration or vertical entry) is defined as the vertical distance that the outer periphery of the upper circular slitting blade extends below the top tangent line of the lower circular slitting blade. It represents the physical vertical engagement between opposing knife edges on the slitting arbor.<\/p><p>It is vital to distinguish vertical overlap from horizontal side clearance:<\/p><ul><li><strong>Vertical Overlap<\/strong>: Controls the depth of initial knife entry into the strip and influences the point along the cut line where internal tensile stress exceeds the material\u2019s ultimate shear strength.<\/li>\n\n<li><strong>Horizontal Side Clearance<\/strong>: Refers to the lateral gap between the cutting faces of the upper and lower blades, which directs the angle and propagation path of the shear fracture.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Points cl\u00e9s \u00e0 retenir<\/strong>: Vertical overlap controls how deeply the rotary knives penetrate the metal strip before fracture occurs, while horizontal side clearance directs the angle of propagation. Both parameters must work in tandem to establish a clean edge.<\/p><\/blockquote><p>The fundamental governing principle for setting vertical overlap is the&nbsp;<strong>minimum overlap for a stable cut rule<\/strong>. The optimal vertical overlap is the smallest penetration depth that produces a complete, continuous fracture across the full length and width of the coil without leaving uncut strands or slivers.<\/p><p>As a baseline reference across standard light-to-medium gauge carbon steels, vertical overlap typically falls within a window equal to&nbsp;<strong>5% to 15% of the strip thickness<\/strong>. However, this baseline must be dynamically adjusted depending on material ductiled tensile strength, strip gauge, and arbor rigidity.<\/p><h3 class=\"wp-block-heading\" id=\"0a288bf0-33b2-42da-b23c-b603d892105d\">The Consequences of Incorrect Overlap<\/h3><p>Deviating from the optimal overlap window compromises edge geometry and accelerates mechanical wear on slitting arbors and tooling.<\/p><h4 class=\"wp-block-heading\" id=\"0797c209-ee47-4f47-8397-8b6ca0ee2128\">1. Under-Overlap (Insufficient Penetration)<\/h4><p>When the upper knife does not penetrate deeply enough below the lower knife tangent plane:<\/p><ul><li><strong>Incomplete Separation<\/strong>: The metal strip fails to fracture completely, leading to uncut sections or persistent web strands that jam downstream coiling equipment.<\/li>\n\n<li><strong>Ragged and Torn Edges<\/strong>: Instead of a clean fracture, the metal undergoes excessive tensile stretching, resulting in torn, jagged edge profiles with heavy hanging burrs.<\/li>\n\n<li><strong>Slivers and Debris<\/strong>: Incomplete shearing creates fine metallic slivers and wire-like burrs that contaminate strip surfaces and damage tension stand rolls.<\/li><\/ul><p>For a complete root-cause diagnostic framework \u2014 covering clearance, knife condition, alignment, and tension as the full variable set \u2014 see the&nbsp;<a href=\"https:\/\/maxtormetal.com\/fr\/slitting-burr-reduction-root-causes-setup-windows\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>R\u00e9duction des bavures de refendage\u00a0: matrice des causes profondes, fen\u00eatres de configuration et protocole d\u2019inspection<\/em><\/strong><\/a>.<\/p><h4 class=\"wp-block-heading\" id=\"0416d1af-f7e5-423c-a955-9eb99396cacf\">2. Over-Overlap (Excessive Penetration)<\/h4><p>When the upper knife penetrates too deeply into the lower knife plane:<\/p><ul><li><strong>Increased Friction and Heat<\/strong>: Excessive blade engagement creates severe friction along the knife side faces, causing thermal expansion, localized overheating, and loss of edge hardness.<\/li>\n\n<li><strong>Edge Galling and Chipping<\/strong>: Heavy vertical loading forces metal against the blade side walls, causing material pickup (galling) on aluminum or stainless coils and micro-chipping along the knife cutting edge.<\/li>\n\n<li><strong>Metal Dust Formation<\/strong>: Deep penetration grinds the sheared edge, creating fine iron powder or metal dust that accumulates in arbor bearings and optical line sensors.<\/li>\n\n<li><strong>Accelerated Tool Wear<\/strong>: Excessive overlap forces the knives to perform unnecessary sliding work, shortening regrind intervals by up to 50%.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"e37448d7-1f58-4f2d-9697-c6f3a8863800\">Coordinating Overlap with Horizontal Clearance<\/h3><p>Vertical overlap cannot be adjusted in isolation. Shear cutting relies on a balanced two-stage fracture mechanism:<\/p><ol><li><strong>Plastic Deformation (Burnish\/Shear Band)<\/strong>: The knives penetrate the upper and lower surfaces of the strip, creating a smooth, shiny burnished band that typically accounts for the upper 20% to 35% of strip thickness.<\/li>\n\n<li><strong>Brittle Fracture (Break Band)<\/strong>: As vertical penetration reaches the critical strain threshold, cracks initiate from opposing knife tips and meet in the middle, creating a matte fracture zone that covers the remaining 65% to 80% of strip thickness.<\/li><\/ol><p>To maintain a clean edge profile (with a burnish-to-fracture ratio of roughly 1:2 or 1:3), vertical overlap and horizontal clearance must be balanced simultaneously. If horizontal clearance is widened for a harder material, vertical overlap must often be reduced slightly to prevent excessive bending moments across the shear zone.<\/p><p>That burnish-to-fracture split is not a universal constant\u2014it shifts sharply with material behavior, and reading it correctly is one of the fastest ways to judge whether a cut is running properly. In&nbsp;<strong>Advanced High-Strength Steel (AHSS)<\/strong>, high yield strength drives crack initiation almost the moment the blade engages, so the burnish zone can collapse to&nbsp;<strong>under 10% of strip thickness<\/strong>&nbsp;and the edge is dominated by a brittle break band.&nbsp;<strong>Mild carbon steel<\/strong>&nbsp;sits in the middle, producing the familiar burnish band of roughly&nbsp;<strong>20% to 35%<\/strong>.&nbsp;<strong>Soft aluminum alloys<\/strong>, with their high elongation and ductility, resist fracture far longer, yielding a noticeably&nbsp;<strong>thicker burnish band<\/strong>&nbsp;and a smaller fracture zone. This matters for edge specifications: a thick, shiny burnish zone points to excessive plastic deformation (deep penetration, or too-tight clearance), while a nearly absent burnish band suggests the material is fracturing almost instantly\u2014expected in AHSS, but a red flag if it appears on a ductile grade.<\/p><p>This balance is echoed in published tooling practice. The setup method described in U.S. Patent&nbsp;<a href=\"https:\/\/patents.google.com\/patent\/US4680851A\/en\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>US4680851A<\/strong><\/em><\/a>, for example, states that knife clearance should approximate&nbsp;<strong>10% of strip gauge for hard temper<\/strong>&nbsp;et&nbsp;<strong>5% for soft temper<\/strong>\u2014a direct illustration of how clearance must track material condition rather than follow a single fixed figure. Industry process references such as&nbsp;<a href=\"https:\/\/www.ispatguru.com\/flattening-levelling-slitting-and-shearing-of-coiled-flat-steel-product\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><em><strong>IspatGuru<\/strong><\/em><\/a>&nbsp;similarly note that knife horizontal clearance and vertical overlap are both critical to slit quality, warning that a large horizontal clearance can cause excessive edge roll-over and burr, while an excessively tight clearance risks premature knife wear or damage.<\/p><p>Furthermore, knife calibration is not a one-time setup. Both vertical overlap and horizontal clearance must be re-calculated and verified whenever:<\/p><ul><li>Knives are reground or replaced (accounting for blade outer diameter reduction).<\/li>\n\n<li>Stripper rings or arbor spacers are changed.<\/li>\n\n<li>The processing line shifts to a new coil thickness, temper, or material grade.<\/li><\/ul><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h2 class=\"wp-block-heading\" id=\"94cbf59a-0489-45b6-8aa9-5c1e605e0d6d\">Guide de Recouvrement Selon le Mat\u00e9riau<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1018\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Roll-Shear-Blade.jpg\" alt=\"Guide de Recouvrement Selon le Mat\u00e9riau\" class=\"wp-image-5558\" style=\"width:699px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Roll-Shear-Blade.jpg 1000w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Roll-Shear-Blade-295x300.jpg 295w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Roll-Shear-Blade-768x782.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Roll-Shear-Blade-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Roll-Shear-Blade-600x611.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div><p>A common pitfall in coil slitting operations is applying a fixed percentage rule across all metal grades. Material behavior during shear cutting varies dramatically based on yield strength, tensile strength, strain hardening exponent, ductility, and surface coating.<\/p><p>Advanced materials demand tighter operational windows:<\/p><ul><li><strong>Advanced High-Strength Steels (AHSS)<\/strong>: High yield strength means crack initiation occurs almost immediately upon blade entry. Excessive overlap causes severe shock loading and knife edge breakdown.<\/li>\n\n<li><strong>Coating-Sensitive Aluminum<\/strong>: Soft, ductile aluminum alloys possess high elongation properties and stickiness, making them prone to edge rollover and side-face galling if vertical entry is even slightly excessive.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"8122362a-726f-4a48-be0e-5d2c0a9effcd\">Recommended Overlap Ranges by Material<\/h3><p>The table below outlines baseline vertical overlap parameters, horizontal clearances, and characteristic edge outcomes across primary industrial coil alloys:<\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Material Family<\/th><th>Typical Yield Strength<\/th><th>Recommended Vertical Overlap (% of Strip Thickness)<\/th><th>Recommended Horizontal Clearance (% per side)<\/th><th>Edge Quality &amp; Process Behavior<\/th><\/tr><tr><td>Mild Carbon Steel (CR4, DD11, A36)<\/td><td>180 \u2013 350 MPa<\/td><td>10% \u2013 15% (Light gauge)5% \u2013 10% (Heavy gauge)<\/td><td>8% \u2013 10%<\/td><td>Broad processing window; smooth shear band; low sensitivity to minor setting drift.<\/td><\/tr><tr><td>Advanced High-Strength Steel (DP600, DP1000, TRIP)<\/td><td>600 \u2013 1200+ MPa<\/td><td>3% \u2013 8%<\/td><td>12% \u2013 18%<\/td><td>Extremely narrow window; brittle fracture occurs rapidly; requires reduced overlap to prevent blade micro-chipping.<\/td><\/tr><tr><td>Aluminum Alloys (3000, 5000, 6000 Series)<\/td><td>100 \u2013 300 MPa<\/td><td>5% \u2013 10%<\/td><td>5% \u2013 7%<\/td><td>High risk of edge burrs and pickup; minimal overlap required; demands highly polished knife faces.<\/td><\/tr><tr><td>Stainless Steel (304, 316, 430 Series)<\/td><td>250 \u2013 600 MPa<\/td><td>8% \u2013 12%<\/td><td>10% \u2013 15%<\/td><td>High work-hardening rate; requires precise penetration to snap the edge cleanly without dragging or work-hardening burrs.<\/td><\/tr><\/tbody><\/table><\/figure><p>A general rule of thumb applies to strip thickness:&nbsp;<strong>thinner, ductile metals require a higher percentage of vertical overlap to initiate crack propagation, whereas thicker, high-strength metals require significantly less vertical overlap because the material fractures under lighter entry depths.<\/strong><\/p><p>These process margins are framed by internationally recognized product standards. Slit width tolerances and edge classifications are governed by specifications such as&nbsp;<strong>ASTM A568\/A568M<\/strong>&nbsp;et&nbsp;<strong>ASTM A109\/A109M<\/strong>&nbsp;(which define edge conditions including No. 3 slit edge), while&nbsp;<strong>ASTM A480\/A480M<\/strong>&nbsp;covers edge conditions for stainless steel and&nbsp;<strong>ISO 9445-2<\/strong>&nbsp;sets dimensional and form tolerances for slit cold-rolled stainless strip. Note that the term &#8220;burr&#8221; is formally defined in&nbsp;<strong>ASTM A623<\/strong>&nbsp;as metal displaced beyond the surface plane by slitting or shearing. Clearance and overlap values themselves are not fixed by a single mandatory standard; they remain process-setting recommendations that must be tuned within the dimensional windows those standards define.<\/p><h3 class=\"wp-block-heading\" id=\"5dae8517-ce5e-404d-831a-68c5b2b82e20\">Precision Tooling for Stable Overlap<\/h3><p>Holding vertical overlap tolerances across a multi-knife arbor\u2014sometimes carrying 20 to 50 individual slitting heads\u2014requires sub-micron mechanical accuracy. If individual rotary knives vary in outer diameter, or if spacers suffer from axial thickness variation, vertical overlap will wobble across the arbor width. A variation of just 0.01 mm in knife radius translates directly to a 0.01 mm error in vertical penetration.<\/p><p>To eliminate overlap drift across the arbor:<\/p><ul><li>Rotary slitting knives must be manufactured from high-purity alloy steels refined through Electroslag Remelting (ESR), such as AISI D2 (1.2379), H13 (1.2344), High-Speed Steel (M2\/1.3343), or Powder Metallurgy (PM) steels. ESR processing eliminates primary eutectic carbide segregation (M\u2087C\u2083 and VC monocarbides), ensuring uniform toughness and edge wear resistance.<\/li>\n\n<li>Outer diameters and bore concentricity must be precision-ground to within \u00b10.001 mm tolerances.<\/li>\n\n<li>Precision arbor spacers must maintain strict parallelism to prevent cumulative axial runout and angular deflection under shear load.<\/li><\/ul><p>For spacer tolerance specifications, face flatness targets, and rubber ring compression standards that directly affect axial runout and overlap stability, see the\u00a0<a href=\"https:\/\/maxtormetal.com\/fr\/precision-slitting-spacers-rubber-rings-blade-life\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>guide des entretoises de refendage de pr\u00e9cision et des anneaux en caoutchouc<\/strong><\/em><\/a>. For the stack-up arithmetic showing how knife OD variation and spacer thickness errors accumulate into width deviation across a full arbor \u2014 including TIR target bands and worst-case vs RSS models \u2014 see <strong><a href=\"https:\/\/maxtormetal.com\/fr\/rotary-slitter-axial-runout-strip-width-tolerance\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Rotary Slitter Axial Runout: Stack-Up Math, TIR Targets &amp; Width Control<\/em><\/a><\/strong>.<\/p><p>High-precision tooling solutions manufactured by&nbsp;<strong>Maxtor Metal<\/strong>, including custom-ground rotary slitting knives and hardened spacers, ensure uniform vertical overlap settings across every cut pocket. Their material selection expertise and strict thermal treatment controls help extend blade working life, maintain consistent edge burr standards, and minimize planned line stops.<\/p><p>Maxtor Metal&#8217;s approach to overlap stability rests on four levers that buyers can specify and verify during procurement:<\/p><ol><li><strong>Material grade matched to the cut, not the catalog.<\/strong>&nbsp;Blade steel is selected against the target coil\u2014carbon steel, AHSS, aluminum, or stainless\u2014so that hardness and wear resistance suit the actual shear load rather than a generic default.<\/li>\n\n<li><strong>Controlled heat treatment for uniform hardness.<\/strong>&nbsp;Consistent austenitizing, quenching, and tempering cycles reduce soft spots and patchy hardness that would otherwise make one knife wear faster than its neighbors on the same arbor.<\/li>\n\n<li><strong>Precision grinding of OD, bore, and faces.<\/strong>&nbsp;Holding outer diameter, bore concentricity, and side-face flatness to tight tolerances keeps every knife in a multi-head arbor contributing the same effective penetration.<\/li>\n\n<li><strong>Dimensional verification as a deliverable.<\/strong>&nbsp;Because overlap drift is ultimately caused by dimensional variation, inspection of critical dimensions before shipment lets the customer confirm that a new knife set will interface with their existing spacers and arbors without introducing overlap error.<\/li><\/ol><p>This is the practical link between tooling quality and edge quality: because a variation of just 0.01 mm in knife radius becomes a 0.01 mm error in vertical penetration, controlling knife and spacer dimensions upstream is what allows the downstream overlap setting to remain stable.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/09\/image-8-1024x572.png\" alt=\"Infographic comparing recommended overlap ranges with edge quality outcomes for mild steel, AHSS, aluminum, and stainless steel\" class=\"wp-image-8087\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/09\/image-8-1024x572.png 1024w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/09\/image-8-300x167.png 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/09\/image-8-768x429.png 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/09\/image-8-18x10.png 18w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/09\/image-8-600x335.png 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/09\/image-8.png 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h2 class=\"wp-block-heading\" id=\"b5478f59-4188-4472-a7a0-a3d3113bc05f\">R\u00e9glage Dynamique du Recouvrement sur les Lignes de Longitudinalage Modernes<\/h2><p>Traditional slitting lines relied on manual handwheel adjustments and mechanical feeler gauges to set upper arbor heights. On modern, high-speed automated slitting lines, manual adjustments have been replaced by motorized upper arbor actuators integrated with digital recipe controls.<\/p><p>Automated upper arbor positioning systems dynamically reposition the upper slitting arbor relative to the fixed lower arbor based on pre-programmed material recipes. Key features of dynamic overlap control include:<\/p><ul><li><strong>Closed-Loop Linear Encoder Feedback<\/strong>: Optical or magnetic encoders continuously monitor the vertical position of the arbor bearing blocks with positioning accuracy down to 0.002 mm.<\/li>\n\n<li><strong>HMI Recipe Control<\/strong>: Equipment operators select the material grade, thickness, coil width, and knife outer diameter on the Human-Machine Interface (HMI). The control system automatically calculates and sets the required vertical penetration.<\/li>\n\n<li><strong>Compensation de d\u00e9flexion<\/strong>: Advanced controls automatically increase vertical penetration slightly toward the center of wide arbors to offset mechanical arbor flexing under heavy shear loads.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Conseil de pro<\/strong>: Always log reground knife outer diameters into your HMI control system. Failing to update the blade radius parameter after regrinding will cause automated positioning systems to under-penetrate the coil, resulting in severe edge burrs.<\/p><\/blockquote><p>A practical note on tooling compatibility with automated systems: closed-loop positioning accuracy is only as good as the dimensional consistency of the knives and spacers it is positioning. If knife OD varies across a set, or if spacer face thickness is not held to a tight tolerance, the encoder will report the commanded position accurately \u2014 but the actual penetration at each cut pocket will still drift.&nbsp;<strong>Maxtor Metal<\/strong>&#8216;s dimensional inspection protocol includes OD verification of every knife in a set and face parallelism checks on spacers before shipment, so that the physical stack matches the recipe input your HMI is working from.<\/p><h3 class=\"wp-block-heading\" id=\"b46d4a98-e7be-45a2-bbbc-ac76aa870044\">Setup Best Practices for Consistent Edge Quality<\/h3><p>To achieve consistent, burr-free edge quality run after run, slitting line crews should adhere to a structured setup protocol:<\/p><ol><li><strong>Establish the Baseline Minimal Overlap<\/strong>: Begin setup with the conservative minimum overlap recommended for the material gauge. Increase penetration only until a complete, clean shear is achieved across all strip mults. In practice, &#8220;complete, continuous fracture&#8221; is a judgment you make from several signals together, not from the dial alone:<ul><li><strong>No uncut strands.<\/strong>&nbsp;The most immediate check: run a short length and confirm the strip has fully separated across every mult, with no web strands or connected slivers bridging the cut. Even one surviving strand means penetration is still short of the minimum.<\/li>\n\n<li><strong>Break-band meets mid-thickness.<\/strong>&nbsp;Examine the cut face: a correct cut shows opposing crack fronts from the top and bottom meeting near the strip&#8217;s mid-plane. Cracks that stall and leave a rough ridge low on the edge point to under-penetration.<\/li>\n\n<li><strong>Confirm with a test strip.<\/strong>&nbsp;For a fast physical check, feed a thin test strip or use a feeler gauge to verify the knives are genuinely overlapping, since the commanded reading and real blade engagement diverge as knife OD shrinks.<\/li>\n\n<li><strong>Watch the burnish-to-break ratio.<\/strong>&nbsp;A burnish band well above roughly 35% of thickness signals you&#8217;ve already pushed past the minimum; a band that stays thick after increasing penetration means the extra overlap isn&#8217;t translating into fracture.<\/li><\/ul><\/li>\n\n<li><strong>Verify Arbor Alignment and Parallelism<\/strong>: Use dial indicators to verify that the upper and lower arbors remain perfectly parallel under clamping load. Angular misalignment causes excessive overlap on one side of the line and under-overlap on the other. For a structured TIR verification procedure \u2014 covering dial indicator setup, ISO fit class selection, and blue-check acceptance protocol \u2014 see the&nbsp;<a href=\"https:\/\/maxtormetal.com\/fr\/oem-slitter-knife-blueprint-spindle-fit-audit-checklist\/\" target=\"_blank\" rel=\"noreferrer noopener\">O<em><strong>EM Slitter Knife Blueprint: Spindle Fit Audit, ISO Tolerances &amp; TIR Gates<\/strong><\/em><\/a>.<\/li>\n\n<li><strong>Recheck Settings After Every Changeover<\/strong>: Never assume a previous setup applies to a new master coil. Even minor variations in coil thickness (e.g., from 1.0 mm to 1.15 mm) or yield strength require re-evaluating overlap and clearance settings.<\/li>\n\n<li><strong>Inspect Stripper Rings and Arbor Bearings<\/strong>: Ensure shore hardness and outer diameter of rubber stripper rings are matched to the knife setup. Worn arbor support bearings permit arbor movement during acceleration, causing vertical overlap to drift during high-speed running.<\/li>\n\n<li><strong>Track Edge Quality Trends<\/strong>: Regularly measure burr height using optical comparators or micrometer burr gauges. A sudden increase in burr height indicates either knife edge dulling or vertical overlap shift caused by thermal expansion.<\/li><\/ol><h3 class=\"wp-block-heading\" id=\"588815af-ce2e-431c-af8c-b54554f41858\">Field Notes: A First-Hand Troubleshooting Sequence<\/h3><p>Drawing on 10 years of coil slitting troubleshooting across carbon steel, AHSS, stainless, and aluminum processing lines,&nbsp;<strong>Jerry Chu<\/strong>, Technical Support Specialist at Maxtor Metal, offers the following field-tested diagnostic sequence. When an operator reports a sudden change in edge quality, the fastest path to root cause is to work through these variables in order \u2014 rather than reaching immediately for the overlap handwheel:<\/p><ol><li><strong>Separate the symptom from the cause.<\/strong>&nbsp;A burr that appears only on one side of the strip usually points to arbor misalignment or unequal spacer stacking, not to a global overlap error. A burr that appears on every mult points toward a shift in the shared setup parameter.<\/li>\n\n<li><strong>Check knife condition before geometry.<\/strong>&nbsp;A dull or micro-chipped edge mimics an under-overlap condition by tearing rather than shearing the metal. Confirm the cutting edge is sound before adjusting penetration, otherwise you risk compensating for a worn blade by over-driving the overlap.<\/li>\n\n<li><strong>Verify the actual overlap, not the dial reading.<\/strong>&nbsp;Encoders and handwheels report commanded position, not true blade engagement. After every regrind, confirm the real penetration with a feeler gauge or a thin test strip, because the reading and reality diverge as knife OD shrinks.<\/li>\n\n<li><strong>Look at the dust and slivers, not just the edge.<\/strong>&nbsp;Metal dust and fine iron powder accumulating around arbor bearings or on line sensors is a reliable sign of over-penetration \u2014 the knives are grinding the sheared edge rather than fracturing it cleanly. Metallic slivers or wire-like burrs trailing from the strip edge point in the opposite direction: insufficient penetration has left the fracture incomplete. The by-product tells you which direction the setting has drifted before the edge measurement does.<\/li>\n\n<li><strong>Re-baseline after any material change.<\/strong>&nbsp;Because each alloy, temper, and gauge combination shifts the crack-initiation threshold, the overlap that produced a clean edge on one coil may be wrong for the next. Treat the last good setup as a starting hypothesis, not a guarantee.<\/li><\/ol><h3 class=\"wp-block-heading\" id=\"ae8ba005-a074-4534-be96-fc42ac815eb5\">The Business Impact of Optimized Overlap<\/h3><p>Controlling rotary knife overlap is not merely a technical exercise\u2014it directly drives key performance indicators (KPIs) and operational profitability for steel service centers and metal fabricators.<\/p><p>The figures below reflect commonly observed shop-floor outcomes, separated by primary driver: overlap calibration alone (applicable to any line with manual or automated setup), and automated positioning systems (applicable only to lines with motorized arbor control and HMI recipe management). Improvements from both drivers compound when implemented together.<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>From overlap calibration discipline (manual or automated lines)<\/strong><\/p><\/blockquote><ul><li><strong>Up to 25% Reduction in Scrap<\/strong>: Eliminating edge slivers, heavy burrs, and off-spec slit widths prevents entire coil mults from being rejected at customer stamping plants.<\/li>\n\n<li><strong>Extended Tooling Life<\/strong>: Avoiding over-penetration reduces friction and thermal stress, allowing high-quality slitting blades to achieve up to 40% more tonnage between regrinds.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>From automated arbor positioning systems (motorized lines with recipe control)<\/strong><\/p><\/blockquote><ul><li><strong>Shorter Changeover Times<\/strong>: Automated, recipe-driven overlap positioning reduces setup times from 30 minutes to under 5 minutes per coil changeover.<\/li>\n\n<li><strong>Higher First-Pass Yield<\/strong>: Precise overlap eliminates trial-and-error test cuts, allowing lines to ramp directly to full operating speeds (up to 300 m\/min) with total edge confidence.<\/li><\/ul><p>If you&#8217;re evaluating whether a knife material upgrade can extend regrind intervals and improve overlap stability, the&nbsp;<a href=\"https:\/\/maxtormetal.com\/fr\/rotary-slitter-knife-roi-pm-hss-vs-tool-steel\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>guide de ROI des couteaux de refendage rotatifs<\/strong><\/em><\/a>&nbsp;provides a cost-per-ton model for PM-HSS vs tool steel across AHSS, stainless, and aluminum.<\/p><p>In a comprehensive total cost of ownership (TCO) model, reduced scrap rates, lower maintenance downtime, and extended tooling life work together to lower the total tooling cost per processed ton of metal coil.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Rotary-Slitting-Tool.jpg\" alt=\"R\u00e9glage Dynamique du Recouvrement sur les Lignes de Longitudinalage Modernes\" class=\"wp-image-5560\" style=\"width:650px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Rotary-Slitting-Tool.jpg 1000w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Rotary-Slitting-Tool-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Rotary-Slitting-Tool-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Rotary-Slitting-Tool-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Rotary-Slitting-Tool-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Rotary-Slitting-Tool-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Rotary-Slitting-Tool-100x100.jpg 100w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h2 class=\"wp-block-heading\" id=\"9f356ed2-9671-4394-8658-39a0bc64cc69\">Questions fr\u00e9quemment pos\u00e9es (FAQ)<\/h2><h3 class=\"wp-block-heading\" id=\"0425f112-4272-4973-b313-6609d699c0f7\">Q : Quelle est la diff\u00e9rence entre le recouvrement des couteaux et le jeu horizontal en longitudinalage ?<\/h3><p>Vertical knife overlap (or penetration) is the vertical depth that the upper circular knife extends past the lower knife&#8217;s top edge. Horizontal clearance is the sideways gap between the cutting faces of the upper and lower knives. Overlap controls the depth of initial blade entry, while horizontal clearance determines the angle of the fracture line through the metal.<\/p><h3 class=\"wp-block-heading\" id=\"195253f4-8b3d-4cce-a7b5-3a5cb8f52ef6\">Q : Comment calculer le recouvrement correct des couteaux circulaires pour le d\u00e9coupage de l'acier ?<\/h3><p>For standard carbon steels, a starting baseline for vertical overlap is&nbsp;5% to 15% of the strip thickness. For thin gauges (under 1.0 mm), use 10% to 15% of strip thickness; for thicker gauges (over 3.0 mm), reduce overlap to 3% to 8%. Consistent with the&nbsp;minimum overlap for a stable cut rule&nbsp;defined in the Science section above, always use the smallest vertical overlap that still delivers a complete, continuous fracture across the full strip width \u2014 no uncut strands or slivers left behind.<\/p><h3 class=\"wp-block-heading\" id=\"a8115270-46a1-469e-a868-73b12b489b99\">Q : Qu'est-ce qui provoque d'importantes bavures sur le bord d'une bobine m\u00e9tallique cisaill\u00e9e ?<\/h3><p>Heavy burrs are typically caused by either&nbsp;insufficient vertical overlap&nbsp;(which tears the metal rather than shearing it cleanly),&nbsp;excessive horizontal clearance, or&nbsp;dull knife cutting edges. If vertical penetration is too shallow, crack propagation fails to meet in the middle, leaving a raised metal ridge along the bottom edge.<\/p><h3 class=\"wp-block-heading\" id=\"86a51a4c-4f24-41d6-9972-f0add92c863a\">Q : Pourquoi l'acier haute r\u00e9sistance (AHSS) n\u00e9cessite-t-il moins de recouvrement que l'acier doux ?<\/h3><p>R : L'AHSS poss\u00e8de une limite d'\u00e9lasticit\u00e9 et une r\u00e9sistance \u00e0 la traction \u00e9lev\u00e9es, ce qui signifie que la contrainte interne atteint le seuil de rupture presque imm\u00e9diatement d\u00e8s l'attaque du couteau. Appliquer un recouvrement important sur l'AHSS provoque des chocs d'impact excessifs, l'\u00e9br\u00e9chure des ar\u00eates de coupe et une formation s\u00e9v\u00e8re de bavures. L'AHSS exige un faible recouvrement vertical combin\u00e9 \u00e0 un jeu horizontal plus large.<\/p><h3 class=\"wp-block-heading\" id=\"e6d4acd6-6f3e-463c-bd4e-1b463aed24b7\">Q : Comment le r\u00e9aff\u00fbtage des couteaux affecte-t-il les r\u00e9glages de recouvrement vertical ?<\/h3><p>R : Le r\u00e9aff\u00fbtage r\u00e9duit le diam\u00e8tre ext\u00e9rieur (OD) d'un couteau circulaire de longitudinalage. Si la hauteur de l'arbre sup\u00e9rieur n'est pas ajust\u00e9e vers le bas pour compenser le rayon r\u00e9duit du couteau, la p\u00e9n\u00e9tration verticale r\u00e9elle dans la bande sera inf\u00e9rieure \u00e0 la valeur attendue. Les op\u00e9rateurs doivent saisir le diam\u00e8tre exact du couteau apr\u00e8s aff\u00fbtage dans leur logiciel de configuration de ligne ou ajuster manuellement la position de l'arbre pour r\u00e9tablir un recouvrement correct.<\/p><h3 class=\"wp-block-heading\" id=\"ffd1e15c-7d46-43b2-9f54-df14cd515c83\">Q : Un mauvais recouvrement peut-il provoquer l'\u00e9br\u00e9chure ou la rupture des couteaux circulaires ?<\/h3><p>R : Oui. Un recouvrement vertical excessif force les faces lat\u00e9rales des couteaux sup\u00e9rieur et inf\u00e9rieur \u00e0 frotter l'une contre l'autre ou \u00e0 comprimer fortement la bande m\u00e9tallique. Cela g\u00e9n\u00e8re des charges axiales \u00e9lev\u00e9es et des contraintes thermiques, entra\u00eenant le grippage, la micro-\u00e9br\u00e9chure des ar\u00eates ou la rupture catastrophique du couteau, en particulier lors du traitement d'alliages durs ou d'acier inoxydable.<\/p><h3 class=\"wp-block-heading\" id=\"a04f20bd-0e81-4c13-92b1-7954bae864a8\">Q : La vitesse de la ligne de longitudinalage modifie-t-elle le recouvrement requis des couteaux ?<\/h3><p>R : Oui, la vitesse de ligne influe indirectement sur le comportement du recouvrement. \u00c0 mesure que la vitesse augmente, la chaleur g\u00e9n\u00e9r\u00e9e par le frottement dans la zone de cisaillement augmente \u00e9galement. Cette dilatation thermique modifie la relation effective entre les arbres sup\u00e9rieur et inf\u00e9rieur, de sorte qu'un r\u00e9glage offrant une ar\u00eate propre \u00e0 basse vitesse peut d\u00e9river vers une sous-p\u00e9n\u00e9tration ou une sur-p\u00e9n\u00e9tration \u00e0 haute vitesse. C'est pourquoi le recouvrement doit \u00eatre v\u00e9rifi\u00e9 \u00e0 la vitesse r\u00e9elle de production (ou tr\u00e8s proche) et non uniquement lors du fonctionnement en marche lente ou de l'engagement. Les lignes \u00e9quip\u00e9es d'une compensation thermique et de flexion maintiennent le recouvrement de mani\u00e8re plus constante lors de la mont\u00e9e en vitesse, mais les lignes manuelles doivent recontr\u00f4ler la qualit\u00e9 de l'ar\u00eate apr\u00e8s avoir atteint la vitesse de r\u00e9gime.<\/p><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h2 class=\"wp-block-heading\" id=\"e227c1e0-a844-4fe5-901a-e6f5a05077aa\">Conclusion<\/h2><p>Le recouvrement des couteaux circulaires est une variable fondamentale dans les op\u00e9rations de longitudinalage de bobines de pr\u00e9cision. Loin d'\u00eatre un r\u00e9glage statique, le recouvrement vertical est un param\u00e8tre dynamique qui influe directement sur la hauteur des bavures de la bordure coup\u00e9e, la g\u00e9om\u00e9trie de la zone de cisaillement, le taux d'usure des couteaux et le rendement global de la production.<\/p><p>En passant de r\u00e9glages empiriques manuels \u00e0 un \u00e9talonnage du recouvrement pilot\u00e9 par les donn\u00e9es et adapt\u00e9 au mat\u00e9riau \u2014et en associant le positionnement automatis\u00e9 des arbres \u00e0 des outils de coupe rectifi\u00e9s avec pr\u00e9cision\u2014, les transformateurs de bobines peuvent \u00e9liminer de mani\u00e8re constante les bavures sur les ar\u00eates et r\u00e9duire leurs co\u00fbts d'exploitation.<\/p><p>Upgrading your slitting line performance begins with tooling dimensioned to match your overlap targets \u2014 not generic catalog stock.&nbsp;<strong>Maxtor Metal<\/strong>&#8216;s technical team can review your current knife geometry, regrind history, and arbor configuration, then recommend a knife steel grade, coating, and dimensional specification that holds your overlap window across a full production run. Contact us to discuss&nbsp;<a href=\"https:\/\/maxtormetal.com\/fr\/produit\/lames-de-cisaille-a-rouleaux\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>custom-ground rotary slitting knives<\/em><\/strong><\/a>, precision arbor spacers, and a dimensional inspection package tailored to your line configuration and material mix.<\/p><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h2 class=\"wp-block-heading\" id=\"dc9b2753-9c2e-4dd4-964c-44f35bd9f6e4\">R\u00e9f\u00e9rences et Normes Applicable<\/h2><ul><li><a href=\"https:\/\/store.astm.org\/a0568_a0568m-19a.html\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>ASTM A568\/A568M<\/em><\/strong><\/a>&nbsp;\u2013 Standard Specification for Steel, Sheet, Carbon, Structural, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements for (slit width tolerances and edge conditions).<\/li>\n\n<li><a href=\"https:\/\/store.astm.org\/a0109_a0109m-25.html\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>ASTM A109\/A109M<\/em><\/strong><\/a>&nbsp;\u2013 Standard Specification for Steel, Strip, Carbon (0.25 Maximum Percent), Cold-Rolled (edge numbering, including No. 3 slit edge).<\/li>\n\n<li><a href=\"https:\/\/store.astm.org\/a0480_a0480m-25b.html\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>ASTM A480\/A480M<\/em><\/strong><\/a>&nbsp;\u2013 Standard Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip (stainless edge conditions).<\/li>\n\n<li><a href=\"https:\/\/store.astm.org\/a0623-22.html\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>ASTM A623<\/em><\/strong><\/a>&nbsp;\u2013 Standard Specification for Tin Mill Products, General Requirements (formal definition of burr).<\/li>\n\n<li><a href=\"https:\/\/www.iso.org\/standard\/44434.html\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>ISO 9445-2<\/em><\/strong><\/a>&nbsp;\u2013 Continuously cold-rolled stainless steel \u2013 Tolerances on dimensions and form \u2013 Part 2: Wide strip and plate\/sheet, including slit cold-rolled wide strip below 600 mm width.<\/li>\n\n<li><a href=\"https:\/\/patents.google.com\/patent\/US4680851A\/en\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>US4680851A<\/em><\/strong><\/a>&nbsp;\u2013 \u201cMethod of setting up rotary slitter tooling\u201d (U.S. patent describing clearance selection as a function of strip gauge and temper).<\/li>\n\n<li><a href=\"https:\/\/www.ispatguru.com\/flattening-levelling-slitting-and-shearing-of-coiled-flat-steel-product\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>IspatGuru<\/em><\/strong><\/a>&nbsp;\u2013 \u201cFlattening, Levelling, Slitting, and Shearing of Coiled Flat Steel Product\u201d (industry process reference covering knife horizontal clearance and vertical overlap).<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>The quantitative process ranges presented throughout this guide are intended as engineering starting points. Final overlap and clearance values should always be validated against the applicable product standard and confirmed on your specific slitting line configuration.<\/p><\/blockquote><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h2 class=\"wp-block-heading\" id=\"81637d75-80ae-4475-b1bf-c002663f27c6\">\u00c0 propos de l'auteur<\/h2><p>Jerry Chu is Technical Support Specialist at Maxtor Metal, with 10 years of field experience in coil slitting and precision cutting applications across carbon steel, AHSS, stainless, and aluminum processing lines.<\/p><p>His technical focus for this guide is overlap calibration and shear mechanics: understanding why a given penetration depth produces a clean fracture on one material and edge damage on another, how regrind cycles change effective overlap, and how automated arbor positioning systems can hold\u2014or lose\u2014a stable cut window across a production run. The material-specific overlap windows, burnish\/break ratio guidance, and troubleshooting sequence in this article reflect the diagnostic approach Jerry applies in Maxtor Metal&#8217;s after-sales support engagements.<\/p><p>He holds the&nbsp;<strong>PMP<\/strong>&nbsp;(Project Management Professional) and&nbsp;<strong>CMRP<\/strong>&nbsp;(Certified Maintenance &amp; Reliability Professional) certifications, supporting a structured, reliability-centered approach to tooling and process decisions.<\/p>","protected":false},"excerpt":{"rendered":"<p>In continuous metal coil processing, achieving a clean, square, and burr-free edge is the primary benchmark of a well-calibrated slitting line. Behind every high-yield slitting run are two critical geometric parameters governing shear-cut quality: horizontal side clearance and vertical rotary knife overlap. While horizontal clearance dictates the stress concentration across the strip width, vertical knife [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4851,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,1109],"tags":[1299],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Rotary Knife Overlap: Setup Guide for Clean Slit Edges<\/title>\n<meta name=\"description\" content=\"Rotary knife overlap guide: penetration windows by material, shear mechanics, arbor alignment tips, and automated positioning for coil slitting lines\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/maxtormetal.com\/fr\/rotary-knife-overlap-settings-clean-edge-quality-slitting\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rotary Knife Overlap Settings: Shear Mechanics, Material Windows &amp; 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Fond\u00e9e en 2006 sous le nom de Nanjing Metal Industrial CO., Limited, notre entreprise est sp\u00e9cialis\u00e9e dans la fabrication de lames et de couteaux pour machines industrielles, ainsi que dans les services d&#039;aff\u00fbtage propos\u00e9s \u00e0 des clients dans plus de 80 pays \u00e0 travers le monde.","legalName":"Nanjing Metal Industrial CO., Limited","foundingDate":"2006-02-18","numberOfEmployees":{"@type":"QuantitativeValue","minValue":"11","maxValue":"50"},"address":{"@id":"https:\/\/maxtormetal.com\/rotary-knife-overlap-settings-clean-edge-quality-slitting\/#local-main-place-address"},"telephone":[],"openingHoursSpecification":[{"@type":"OpeningHoursSpecification","dayOfWeek":["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"],"opens":"09:00","closes":"17:00"}],"email":"sales@maxtormetal.com","areaServed":"Worldwide","globalLocationNumber":"+86-158-6180-3357"},{"@type":"Person","@id":"https:\/\/maxtormetal.com\/fr\/#\/schema\/person\/94f8f44e6d04f5d162dc94aeca3da13a","name":"Tommy","image":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/maxtormetal.com\/fr\/#\/schema\/person\/image\/","url":"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/08\/cropped-logo-\u526f\u672c-\u526f\u672c-1.png","contentUrl":"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/08\/cropped-logo-\u526f\u672c-\u526f\u672c-1.png","caption":"Tommy"},"description":"Fort de plus de 13 ans d&#039;exp\u00e9rience dans la fabrication de pales industrielles, la gestion de production et l&#039;optimisation des processus, je m&#039;engage \u00e0 vous fournir un service d&#039;excellence, qu&#039;il s&#039;agisse de solutions sur mesure ou d&#039;assistance technique. Si vous recherchez des solutions m\u00e9caniques pour vos pales et un partenaire fiable, je suis la personne qu&#039;il vous faut. 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