Skiving or scarfing is the process of cutting material off in slices, usually metal, but also leather or laminates. Skiving is used instead of rolling the material to shape when the material must not be work hardened, or must not shed minute slivers of metal later which is common in cold rolling processes.
In metalworking, skiving can be used to remove a thin dimension of material or to create thin slices in an existing material, such as heat sinks where a large amount of surface area is required relative to the volume of the piece of metal.
The process involves moving the strip past precision-profiled slotted tools made to an exact shape, or past plain cutting tools. The tools are usually made of tungsten carbide-based compounds. In early machines, it was necessary to precisely position the strip relative to the cutting tools, but newer machines use a floating suspension technology which enables tools to locate by material contact. This allows mutual initial positioning differences up to approximately 12 mm (0.47 in) followed by resilient automatic engagement. Products using this technology directly are automotive seatbelt springs, large power transformer winding strips, rotogravure plates, cable and hose clamps, gas tank straps, and window counterbalance springs. Products using the process indirectly are tubes and pipes where the edge of the strip is accurately beveled prior to being folded into tubular form and seam welded. The beveled edges enable pinhole free welds.
Skiving requires a minimum material feed rate to cut successfully. At speeds below those of metal planing or about 10 meters/minute (33 feet/minute), the skiving tools can be vibrated at high frequency to increase the relative speed between the tool and workpiece.
Another metal skiving application is for hydraulic cylinders, where a round and smooth cylinder bore is required for proper actuation. Several skiving knives on a round tool pass through a bore to create a perfectly round hole. Often, a second operation of roller burnishing follows to cold-work the surface to a mirror finish. This process is common among manufacturers of hydraulic and pneumatic cylinders.[1] Compared to honing, skiving and roller burnishing is faster and typically provides more precise tolerances and better inside surface finish control.[2]
Skiving can be applied to gear cutting, where internal gears are skived with a rotary cutter (rather than shaped or broached) in a process analogous to the hobbing of external gears.[3]
Skiving is also used for the manufacturing of heat sinks for PC cooling products. A PC cooler created by skiving has the benefit that the heat sink base and fins are created from a single piece of material (copper or aluminum), providing improved heat dissipation and heat transfer from base to fins. Additionally, the skiving process also increases the roughness of the fins. Unlike the underside of a heat sink, which needs to be smooth for maximum contact area with the heat source, the fins benefit from this roughness because it increases the fins' surface area on which to dissipate heat into the air. The fins may be made much thinner and closer together than by extrusion or formed sheet processes, which can offer greater heat transfer in high-performance waterblocks for water cooling.
^"Combination Skiving and Burnishing for Cylinder Bores". Retrieved August 13, 2012.
^Lee, Osmond. "Honing and Skiving&Burnishing Process for Manufacturing Cylinder Tubes". Honed Tube & Chrome Plated Steel Bar Manufacturer-Skyline Pipes. Retrieved 2018-11-27.
^Weppelmann, E; Brogni, J (March 2014), "A breakthrough in power skiving", Gear Production: A Supplement to Modern Machine Shop: 7–12, retrieved 2014-03-11.
External links
Skiving machine patent
The little-known life of the scarfing tool
March 11, 2023
skiving, metalworking, this, article, includes, list, general, references, lacks, sufficient, corresponding, inline, citations, please, help, improve, this, article, introducing, more, precise, citations, june, 2009, learn, when, remove, this, template, messag. This article includes a list of general references but it lacks sufficient corresponding inline citations Please help to improve this article by introducing more precise citations June 2009 Learn how and when to remove this template message Skiving or scarfing is the process of cutting material off in slices usually metal but also leather or laminates Skiving is used instead of rolling the material to shape when the material must not be work hardened or must not shed minute slivers of metal later which is common in cold rolling processes In metalworking skiving can be used to remove a thin dimension of material or to create thin slices in an existing material such as heat sinks where a large amount of surface area is required relative to the volume of the piece of metal The process involves moving the strip past precision profiled slotted tools made to an exact shape or past plain cutting tools The tools are usually made of tungsten carbide based compounds In early machines it was necessary to precisely position the strip relative to the cutting tools but newer machines use a floating suspension technology which enables tools to locate by material contact This allows mutual initial positioning differences up to approximately 12 mm 0 47 in followed by resilient automatic engagement Products using this technology directly are automotive seatbelt springs large power transformer winding strips rotogravure plates cable and hose clamps gas tank straps and window counterbalance springs Products using the process indirectly are tubes and pipes where the edge of the strip is accurately beveled prior to being folded into tubular form and seam welded The beveled edges enable pinhole free welds Skiving requires a minimum material feed rate to cut successfully At speeds below those of metal planing or about 10 meters minute 33 feet minute the skiving tools can be vibrated at high frequency to increase the relative speed between the tool and workpiece Another metal skiving application is for hydraulic cylinders where a round and smooth cylinder bore is required for proper actuation Several skiving knives on a round tool pass through a bore to create a perfectly round hole Often a second operation of roller burnishing follows to cold work the surface to a mirror finish This process is common among manufacturers of hydraulic and pneumatic cylinders 1 Compared to honing skiving and roller burnishing is faster and typically provides more precise tolerances and better inside surface finish control 2 Skiving can be applied to gear cutting where internal gears are skived with a rotary cutter rather than shaped or broached in a process analogous to the hobbing of external gears 3 Contents 1 Heat sinks 2 See also 3 References 4 External linksHeat sinks Edit Skiving machine producing copper heat sink fins Skiving is also used for the manufacturing of heat sinks for PC cooling products A PC cooler created by skiving has the benefit that the heat sink base and fins are created from a single piece of material copper or aluminum providing improved heat dissipation and heat transfer from base to fins Additionally the skiving process also increases the roughness of the fins Unlike the underside of a heat sink which needs to be smooth for maximum contact area with the heat source the fins benefit from this roughness because it increases the fins surface area on which to dissipate heat into the air The fins may be made much thinner and closer together than by extrusion or formed sheet processes which can offer greater heat transfer in high performance waterblocks for water cooling See also EditSkiving leathercraft References Edit Combination Skiving and Burnishing for Cylinder Bores Retrieved August 13 2012 Lee Osmond Honing and Skiving amp Burnishing Process for Manufacturing Cylinder Tubes Honed Tube amp Chrome Plated Steel Bar Manufacturer Skyline Pipes Retrieved 2018 11 27 Weppelmann E Brogni J March 2014 A breakthrough in power skiving Gear Production A Supplement to Modern Machine Shop 7 12 retrieved 2014 03 11 External links EditSkiving machine patent The little known life of the scarfing tool Retrieved from https en wikipedia org w index php title Skiving metalworking amp oldid 1102752446, wikipedia, wiki, book, books, library,
