Каталог Iscar вращающийся инструмент 2017 - страница 721

USER GUIDE Tap Surface Treatments and Coating Types TAPS The high speed steels we use grant high wear resistance TiAIN-COATING – TiAIN and toughness. This is a special coating for machining abrasive materials For machining certain materials, various surface such as: grey cast iron, alu-alloys with silicon, fiber treatments are an advantage. reinforced plastics, etc., or machining under high Steam Tempered (ST) temperatures, which means with insufficient cooling, or high speeds ≥ 600m/min. The TiAIN has a hardness of The steam tempered is a Fe O 3 4 oxide coating which approx. 3,000 HV and is temperature resistant up to reduces the friction between the tool and workpiece and approx. 800°. prevents cold welding. Color: Violet-grey coefficient of friction against steel : 0.4 Nitriding (NI) Hardslick-COATING – Hardslick Recommended surface treatment for machining hard Hardslick combines in a novel way the advantages of an wear/abrasive materials such as grey cast iron, extremely hard, thermally stable TiAIN-coating with the aluminum alloys with high silicon percentage (more sliding and lubricating properties of an outer than 10%). WC/C (Tungsten carbide/carbon) coating. The hardslick TiN Coating (TI) coating has a hardness of approx. 3,000 HV and is temperature-resistant up to approx. 800°. The TiN coating has a hardness of approximately 2,300 Color: Violet-grey coefficient of friction against steel : 0.2 HV and is temperature resistant up to approximately 600°C. This is an excellent golden colored coating Tolerances According to DIN EN 22857 for general applications. For taps with ISO metric threads. TiCN-COATING – TiCN The following chart gives a comparison between TiCN takes place of TiN when the conditions require the the new standard DIN EN 22857 and the withdrawn coating to have a different standard DIN 802 part 1. An important change is hardness and toughness. the re-classification from tap tolerance to tap The TiCN brings an advantage to machining very difficult application class. steels or cutting interrupted bores. The TiCN-coating has a hardness of approx. 3,000 HV, but is temperature-resistant up to approx. 400° only. That means TiCN needs excellent cooling for long service life. Color: Blue-grey coefficient of friction against steel : 0.4 Application class Tolerance class to Allotment of the for taps to withdrawn standard tolerance zones of the nut thread DIN EN 22857 DIN 802 part 1 to be cut Class 1 ISO 1 4H 4H 5H - - - Class 2 ISO 2 6H 5G 5G 6H - - Class 3 ISO 3 6G - - 6G 7H 8H - - 7G - - - 7G 8G A suitable transition period is to be expected. Codes for tolerance classes 7G/8G and tolerance zones have yet to be standardized within DIN EN 22857, and the values from DIN 802 part will remain valid. 717 717