Каталог Iscar высокоточные развертки и метчики 2022 - страница 52
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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 | the new standard DIN EN 22857 and the withdrawn |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
| Application class for taps to DIN EN 22857 | Tolerance class to withdrawn standard DIN 802 part 1 | Allot tolera nut t | ment of the nce zones of the hread to be cut | |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 |
The TiCN brings an advantage to machining very difficult 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 A suitable transition period is to be expected. needs excellent cooling for long service life. Color: Codes for tolerance classes 7G/8G and <X> 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