Каталог Iscar высокоточные развертки и метчики 2022 - страница 52

TAPS USER GUIDE 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 the new standard DIN EN 22857 and the withdrawn standard DIN 802 part 1.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 toapproximately 600°C. This is an excellent goldencolored coating for general applications.TiCN-COATING – TiCNApplicationclass fortaps to DINEN 22857Toleranceclass toAllotment of thewithdrawntolerance zones of thestandard DINnut thread to be cut802 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-coatinghas a hardness of approx. 3,000 HV, but is temperature--7G-- - 7G 8G 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