Каталог Iscar высокоточные развертки и метчики 2022 - страница 52

USER GUIDE TAPS Tap Surface Treatments and Coating Types The high speed steels we use grant high wear resistance Hardslick-COATING – Hardslick and toughness. For machining certain materials, Hardslick combines in a novel way the advantages various surface treatments are an advantage. of an extremely hard, thermally stable TiAIN-coating with the sliding and lubricating properties of an outer Steam Tempered (ST) WC/C (Tungsten carbide/carbon) coating. The hardslick The steam tempered is a Fe3O4 oxide coating coating has a hardness of approx. 3,000 HV and which reduces the friction between the tool is temperature-resistant up to approx. 800°. Color: and workpiece and prevents cold welding. Violet-grey coefficient of friction against steel : 0.2 Nitriding (NI) Tolerances According to DIN EN 22857 Recommended surface treatment for machining hard For taps with ISO metric threads. wear/abrasive materials such as grey cast iron, aluminum The following chart gives a comparison between alloys with high silicon percentage (more than 10%). the new standard DIN EN 22857 and the withdrawn standard DIN 802 part 1. An important change is the TiN Coating (TI) re-classification from tap tolerance to tap application class. The TiN coating has a hardness of approximately 2,300 HV and is temperature resistant up to Tolerance Application approximately 600°C. This is an excellent golden class to Allotment of the class for colored coating for general applications. withdrawn tolerance zones of the taps to DIN standard DIN nut thread to be cut TiCN-COATING – TiCN EN 22857 802 part 1 TiCN takes place of TiN when the conditions require the Class 1 ISO 1 4H 4H 5H - - - coating to have a different hardness and toughness. Class 2 ISO 2 6H 5G 5G 6H - - The TiCN brings an advantage to machining very difficult Class 3 ISO 3 6G - - 6G 7H 8H steels or cutting interrupted bores. The TiCN-coating - - 7G - - - 7G 8G has a hardness of approx. 3,000 HV, but is temperature resistant up to approx. 400° only. That means TiCN A suitable transition period is to be expected. needs excellent cooling for long service life. Color: Codes for tolerance classes 7G/8G and tolerance Blue-grey coefficient of friction against steel : 0.4 zones have yet to be standardized within DIN EN 22857, and the values from DIN 802 part will remain valid. TiAIN-COATING – TiAIN This is a special coating for machining abrasive materials such as: grey cast iron, alu-alloys with silicon, fiber reinforced plastics, etc., or machining under high temperatures, which means with insufficient cooling, or high speeds ≥ 600m/min. TiAIN has a hardness of approx. 3,000 HV and is temperature resistant up to approx. 800°. Color: Violet-grey coefficient of friction against steel : 0.4 362 ISCAR