{"id":4708,"date":"2026-07-20T12:07:22","date_gmt":"2026-07-20T04:07:22","guid":{"rendered":"https:\/\/www.graphitecutting.com\/?p=4708"},"modified":"2026-07-20T12:12:40","modified_gmt":"2026-07-20T04:12:40","slug":"decoupe-de-graphite-de-cuivre","status":"publish","type":"post","link":"https:\/\/www.graphitecutting.com\/fr\/copper-graphite-cutting\/","title":{"rendered":"D\u00e9coupe de graphite de cuivre avec une scie \u00e0 fil diamant\u00e9 : r\u00e9sultats sur le terrain d'une application Cu 75%"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A carbon brush manufacturer recently asked us a blunt question: can diamond wire actually cut copper graphite with 75% copper content, or does the wire load up with smeared copper within the first few cuts? Fair question. Metal-graphite composites sit in an awkward zone for copper graphite cutting \u2014 too metallic for standard graphite parameters, too abrasive and friable for conventional metal sawing. This article walks through the actual trial we ran on their material, the numbers we measured, and why the customer ended up ordering an <a href=\"https:\/\/www.graphitecutting.com\/fr\/scie-a-fil-a-coupe-profilee\/\" target=\"_blank\" rel=\"noreferrer noopener\">SV series vertical wire saw<\/a> even though our cutting speed on the high-copper grade was no faster than their existing process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That last part is worth repeating: on 75% copper graphite, we did not win on speed. We matched it. The purchase decision came down to kerf width, material recovery, operator safety, and automation \u2014 and for anyone slicing silver- or copper-loaded brush blanks, those factors dominate the cost equation anyway.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Is Copper Graphite So Difficult to Cut Cleanly?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Carbon brushes for low-voltage, high-current applications \u2014 forklift traction motors, starter motors, grounding brushes \u2014 use copper graphite grades running anywhere from 20% to 80% copper by weight. The copper raises current-carrying capacity; the graphite provides lubrication against the commutator or slip ring. Dimensional and tolerance requirements for these components are governed by standards such as <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/847\" data-type=\"link\" data-id=\"https:\/\/webstore.iec.ch\/en\/publication\/847\" rel=\"nofollow noopener\" target=\"_blank\">blank<\/a>\u201d , so the blanks have to come off the saw flat and square enough for downstream precision grinding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The manufacturing problem is that the two phases fail differently under a cutting edge. Graphite fractures and powders. Copper deforms plastically and smears. Run a toothed blade through a 75% Cu block and you get three familiar symptoms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Blade loading.<\/strong> Ductile copper packs into the gullets and onto the cutting edges, so cutting force climbs and surface quality degrades cut by cut.<\/li>\n\n\n\n<li><strong>Edge tearing.<\/strong> The blade pulls copper particles out of the graphite matrix at the exit edge instead of shearing them, leaving ragged edges that consume grinding stock.<\/li>\n\n\n\n<li><strong>Wide kerf.<\/strong> Circular blades sized to survive the copper content typically run 2\u20133 mm kerf. On a material where the copper powder alone can represent the majority of raw material cost, every millimeter of kerf is money converted directly into swarf.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">One thing that trips up a lot of first-time evaluators: they benchmark copper graphite cutting methods on speed alone. For electrographite that logic mostly holds. For metal-loaded grades, material recovery per block is usually the bigger lever \u2014 we will put numbers on that below.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There is also a process-control angle that gets overlooked. Because blade loading is progressive, a blade process cuts differently on Monday morning than on Friday afternoon. Slice thickness drifts, edge quality drifts, and the grinding department absorbs the variation with extra stock allowance. A process whose cutting edge condition stays stable \u2014 or is replaced as a cheap, quick-change consumable \u2014 removes that drift from the line.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Trial Material and Setup<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The customer supplied production blocks of two materials from their standard mix:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Mat\u00e9riau<\/th><th>Copper content<\/th><th>Block format<\/th><th>Requirement<\/th><\/tr><\/thead><tbody><tr><td>Copper graphite<\/td><td>75% Cu<\/td><td>Rectangular blocks, ~200 mm length class<\/td><td>Slabs and strips, min. 8 mm slice thickness<\/td><\/tr><tr><td>Natural graphite<\/td><td>0%<\/td><td>Rectangular blocks, ~210 mm length class<\/td><td>Batch slicing into brush blanks<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Their incumbent process was conventional blade sawing. The acceptance criteria we agreed on before the trial: dimensional consistency adequate for direct feed into precision grinding, no edge tearing on the copper phase, and a realistic wire-life observation \u2014 not a three-cut demo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We ran the trial on a vertical block-slicing machine from our SV family, using an <a href=\"https:\/\/www.endlesswiresaw.com\/electroplated-diamond-wire-loop\/\" rel=\"nofollow noopener\" target=\"_blank\">boucle en fil de diamant \u00e9lectrod\u00e9pos\u00e9<\/a> in the 0.6\u20131.0 mm diameter class that we use for graphite work. The closed-loop wire runs unidirectionally at high linear speed rather than reciprocating, which matters for metal-loaded materials: each diamond grit passes through the kerf in one direction with consistent chip clearance, and the loop\u2019s full circumference shares the wear instead of concentrating it on a short reversing segment.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Copper Graphite Cutting Results at 75% Cu<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.graphitecutting.com\/wp-content\/uploads\/2026\/07\/copper-graphite-cutting-with-diamond-wire-saw-\u2014-75-Cu-carbon-brush-blocks-sliced-into-blanks-1024x768.jpg\" alt=\"copper graphite cutting with diamond wire saw \u2014 75% Cu carbon brush blocks sliced into blanks\" class=\"wp-image-4709\" title=\"Solution de coupe au graphite\" srcset=\"\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-srcset=\"\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Feed rate on the 75% copper grade settled at <strong>8 mm\/min<\/strong>. To be direct about it: that is comparable to what the customer was achieving with their existing blade process. If your only metric is millimeters per minute on high-copper material, a diamond wire saw will not transform your throughput on that specific grade. Anyone who tells you otherwise hasn\u2019t cut much 75% Cu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What changed was everything around the feed rate:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Kerf width dropped to roughly 1 mm, from the 2.5\u20133 mm typical of blade sawing.<\/strong> On an 8 mm finished slice, moving from a ~3 mm kerf to a ~1 mm kerf takes the material consumed per slice from ~11 mm down to ~9 mm. Across a block, that is roughly one additional slice recovered for every five cut \u2014 a 15\u201320% improvement in usable yield from the same purchased block. At 75% copper content, the raw block price is driven by copper powder and the mixing\/pressing\/sintering behind it, so yield improvement flows almost directly to material cost per brush blank. This was the line item that carried the purchase decision.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Edge condition improved.<\/strong> The fine exposed diamond grit shears the copper phase rather than tearing it out, so the slabs came off the saw with clean edges and went to grinding without a deburring step. Less grinding stock allowance also feeds back into the yield math above.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>No progressive loading failure.<\/strong> Le bourrage de cuivre sur le fil est le mode de d\u00e9faillance classique auquel les gens s'attendent dans la coupe de cuivre-graphite, et nous l'avons surveill\u00e9 sp\u00e9cifiquement. Avec une vitesse de fil ad\u00e9quate et une avance contr\u00f4l\u00e9e, la boucle unidirectionnelle a continu\u00e9 \u00e0 d\u00e9gager la saign\u00e9e et la force de coupe est rest\u00e9e stable pendant l'essai plut\u00f4t que de monter comme le fait une lame charg\u00e9e. Avertissement : ceci est sensible aux param\u00e8tres. Poussez le taux d'avance pour rechercher le d\u00e9bit sur les nuances \u00e0 haute teneur en cuivre et vous pouvez charger n'importe quel outil abrasif. Le chiffre de 8 mm\/min est celui o\u00f9 le processus s'est d\u00e9roul\u00e9 de mani\u00e8re stable et r\u00e9p\u00e9table, et nous pr\u00e9f\u00e9rerions citer ce nombre plut\u00f4t qu'un pic de course h\u00e9ro\u00efque.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Que s'est-il pass\u00e9 sur le graphite naturel ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La seconde moiti\u00e9 de l'essai a racont\u00e9 l'histoire inverse. Sur le graphite naturel, le fil diamant\u00e9 est simplement un processus plus rapide que la scie \u00e0 ruban \u2014 le graphite pur est un mat\u00e9riau id\u00e9al pour cela, coupant \u00e0 sec avec des taux d'avance plusieurs fois sup\u00e9rieurs \u00e0 ce que permet la nuance de cuivre. Nos param\u00e8tres standard de coupe \u00e0 sec pour le graphite font fonctionner les vitesses de fil de 40\u201370 m\/s avec des taux d'avance de 100 mm\/min qui font para\u00eetre la scie \u00e0 ruban lente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Plus important encore pour un fabricant de balais, le format de la machine verticale permet <strong>le tranchage par lots<\/strong>: plusieurs blocs fix\u00e9s c\u00f4te \u00e0 c\u00f4te et coup\u00e9s en une seule passe, l'\u00e9paisseur de la tranche \u00e9tant r\u00e9gl\u00e9e une fois sur le contr\u00f4leur et r\u00e9p\u00e9t\u00e9e automatiquement. La ligne de graphite naturel du client est pass\u00e9e de la coupe d'un bloc \u00e0 la fois avec un op\u00e9rateur \u00e0 la machine \u00e0 des cycles de tranchage multi-blocs sans surveillance. Pour une gamme de produits o\u00f9 la m\u00eame g\u00e9om\u00e9trie de flan se r\u00e9p\u00e8te en volume, les heures machine par millier de flans ont consid\u00e9rablement diminu\u00e9, m\u00eame avant de compter les \u00e9conomies de saign\u00e9e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Donc, le r\u00e9sum\u00e9 honn\u00eate sur le m\u00e9lange de mat\u00e9riaux : sur les nuances \u00e0 haute teneur en cuivre, vitesse \u00e9gale mais rendement et qualit\u00e9 des bords consid\u00e9rablement meilleurs ; sur les nuances de graphite, mieux sur pratiquement tous les axes. Lequel de ces \u00e9l\u00e9ments est le plus important d\u00e9pend enti\u00e8rement de votre m\u00e9lange de production \u2014 un atelier qui est \u00e0 80 % d'\u00e9lectrographite voit cela diff\u00e9remment d'un atelier sp\u00e9cialis\u00e9 dans les contacts m\u00e9tal-graphite.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Dust, Safety, and Why Automation Mattered Here<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The wire saw configuration changed the risk profile in two ways. First, the cutting zone is enclosed and runs with dust extraction \u2014 graphite cuts dry on our machines, so extraction handles the fines at the source instead of letting them settle across the shop. Second, and this is the part the customer\u2019s production manager cared about most: once the block is fixtured and the recipe is loaded, the operator is not near the cut. Slice thickness, feed, and cycle count run from the touchscreen. An exposed spinning blade in a manual sawing operation is a different conversation with your safety auditor than an enclosed wire running in a guarded envelope.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Graphite dust is the operational headache nobody puts in the brochure. It is conductive, it migrates into electrical cabinets, and <a href=\"https:\/\/www.osha.gov\/chemicaldata\/487\" data-type=\"link\" data-id=\"https:\/\/www.osha.gov\/chemicaldata\/487\" rel=\"nofollow noopener\" target=\"_blank\">occupational exposure <\/a>to graphite dust is regulated in most jurisdictions. Blade sawing throws coarse dust and chips at high energy in an open cutting zone, which is also where the operator\u2019s hands are.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We would not claim the wire saw eliminated their dust management workload \u2014 extraction filters still need servicing, and copper-graphite fines are heavier and settle faster than pure graphite dust, which took some adjustment of the extraction setup during commissioning. But moving the operator out of the cutting zone and enclosing the dust source was, in their words, the difference between managing a hazard and engineering it out.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Limitations and Trade-Offs<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A few boundary conditions worth stating plainly, because this process is not a universal answer:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>High-copper feed rates are what they are.<\/strong> 8 mm\/min at 75% Cu is a stable, production-worthy number, but if your business case requires a step-change in throughput on 70\u201380% copper grades specifically, diamond wire copper graphite cutting alone will not deliver it. The case for the machine rests on yield, quality, and labor \u2014 not raw speed on that material.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Coolant strategy differs by material.<\/strong> Graphite grades cut dry with extraction on our machines. Some metal-loaded grades benefit from light lubrication depending on metal content and particle size, and that decision affects downstream cleaning of the blanks. It is a commissioning-stage parameter, not a catalog checkbox \u2014 another reason we insist on cutting your actual material first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Wire is a consumable.<\/strong> Cutting metal-loaded composites wears wire faster than cutting pure graphite. Wire life on graphite runs on the order of a week of single-shift use; on high-copper material, plan for shorter intervals and cost it into your per-blank calculation. We provide the wear data from sample cuts precisely so this number goes into the spreadsheet as a measurement, not a guess.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Very high silver or copper loadings need individual validation.<\/strong> Every metal-graphite grade behaves slightly differently depending on particle size, density, and sintering. We had cut copper graphite before this trial; we still ran the customer\u2019s actual material before quoting, and we would do the same for a silver graphite grade or an 80% Cu grade. Datasheet similarity is not process validation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Batch slicing gains depend on block standardization.<\/strong> The unattended multi-block runs on natural graphite worked because the customer\u2019s blocks were dimensionally consistent. A shop cutting one-off block sizes captures the kerf and safety benefits but less of the automation benefit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Next Steps If You Cut Metal-Graphite Composites<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If you are evaluating copper graphite cutting for brush blank production, do three things before comparing any equipment quotes. First, calculate your current material recovery: slices actually obtained per block versus the theoretical maximum at zero kerf \u2014 on metal-loaded grades this number is usually worse than anyone in the building assumes. Second, get your highest-metal-content grade cut as a sample, not your easiest one; any process looks good on electrographite. Third, ask for measured wire or blade life on your material so consumable cost enters the comparison honestly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We run free sample cuts on customer-supplied blocks as standard practice \u2014 you get back the cut slabs plus measured feed rate, kerf, and wire wear data for your own math.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Send us your block dimensions and material grades, and we will confirm the right machine configuration for your <a href=\"https:\/\/www.graphitecutting.com\/fr\/produits\/\" target=\"_blank\" rel=\"noreferrer noopener\">coupe de graphite<\/a> application. Contact: <a href=\"mailto:levy@endlesswiresaw.com\">levy@endlesswiresaw.com<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>A carbon brush manufacturer recently asked us a blunt question: can diamond wire actually cut copper graphite with 75% copper content, or does the wire load up with smeared copper within the first few cuts? Fair question. Metal-graphite composites sit in an awkward zone for copper graphite cutting \u2014 too metallic for standard graphite parameters, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4709,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[373],"tags":[],"class_list":["post-4708","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-graphite-cutting-use-cases"],"_links":{"self":[{"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/posts\/4708","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/comments?post=4708"}],"version-history":[{"count":2,"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/posts\/4708\/revisions"}],"predecessor-version":[{"id":4712,"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/posts\/4708\/revisions\/4712"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/media\/4709"}],"wp:attachment":[{"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/media?parent=4708"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/categories?post=4708"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.graphitecutting.com\/fr\/wp-json\/wp\/v2\/tags?post=4708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}