We believe quality is our life. We always maintain the first class quality in the marketand be appreciated by our customers. 90% of our products are widely exported to America, Europe, Thailand, Vietnam etc.
So, for the drill bits test, every time we insist to test its performance.
For HSSM2 Tin coated drill bits, 4.1mm size, totally drill about 400 holes. we believe quality is first.
Each drill bits should have good quality. Usually we make such test, and show test report to our customers. if find some problems, we will discuss with our technical staff and improve drill bits performance.
Straight HSS drill bits performance test specification
(GB1436 — 1985)
1. Cutting standard as following:
diameter mm | Cutting speed m/min | Feeding length mm/r | Drilling depth mm | Number of holes | diameter mm | Cutting speed m/min | Feeding length mm/r | Drilling depth mm | Number of holes |
～ 2.0 | 30 | 手动 | 6 | 15 | ＞6.0～8.0 | 28 | 0.20 | 25 | 30 |
＞2.0～2.5 | 7 | 40 | ＞8.0～10.0 | 0.25 | |||||
＞2.5～3.0 | 9 | ＞10.0～12.0 | 0.28 | 30 | 20 | ||||
＞3.5 | 10 | ＞12.0～14.0 | 0.32 | ||||||
＞3.5～4.0 | 12 | ＞14.0～16.0 | 0.36 | ||||||
＞4.0～4.5 | 28 | 0.13 | 14 | 30 | ＞16.0～18.0 | 0.40 | 35 | ||
＞4.5～5.0 | 0.15 | 16 |
＞18.0～20.0
| 0.43 | 40 | ||||
＞5.0～6.0 | 0.17 | 20 |
Remark:
1. When the speed and feeding length of the machine are not in conformity with this standard, the feeding length per minute should be no less than the number calculated by the standard.
2. test material should be 45# or 50# steel which heat treatment. The hardness is HB170-200. The side of hole should be pre-process and perpendicular to the center line of the machine spindle.
3. cooling liquid should be emulsified oil.
4. Drilling blind hole