コーティングされた各種超硬合金ドリルによるＡｌ‐１７％Ｓｉ合金Ｔ６材の穴あけ加工性
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The drilling performance of the hyper-eutectic Al–17%Si–T6 extruded alloy was investigated by using cermet drill, cemented carbide drill, and cemented carbide drills coated with diamond layer, TiN single-layer and Ti–C–N multilayers. The drilling experiment was conducted with a CNC drilling center (step less drive) by changing machining parameters under a wet condition. The effect of coating material for the various drills on the drilling performance are discussed and evaluated to examine the tool wear, drilling force, chip form and height of burr. The main results are as follows: (1) The wearing behavior of diamond coated drill was very stable for the range of experimental parameters and its tool life is 100 times longer than the others. Therefore, it can be considered that the diamond coated carbide drill is one of the most realistic tool for drilling the hyper-eutectic Al–Si alloys. (2) The wearing behavior of drills, except diamond coated carbide tool, changed with incresing cutting speed and the flank wear of carbide drill was least at the high cutting speed (>1.1 m/s). (3) The cutting speed influences more remarkably on the chip form than the feed rate. The difference of drills is found to have no influence on the chip form. (4) Burr height on entrance circumference corner of drilled holes corresponded to the flank wear of drill; therefore it is affected by cutting conditions and the difference of drills.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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