The Manufacturing Engineering Research Association, jointly established by the three major automobile manufacturing groups in the United States and 10 enterprises, universities and research institutes, including tool manufacturers, aims at how to further improve aluminium alloy Parts dry drill hole The production efficiency and reduction of processing cost were studied. The researchers conducted in-depth and detailed research and simulation tests on the processing materials, cutting parameters, the geometric shape of the drill bit {HotTag}, surface coating, high-pressure cooling air and other technological issues, and optimized the design of fine trimming transverse edge, with 45 ° ground double spiral groove, 150 ° drill tip angle The PVD coated * * dry cutting drill can reach the expected life of 10000 holes when the spindle speed is 4000 rpm and the feed rate is 15 ipm.

In addition, LambTechnicon has also developed a new concept bit for dry drilling. The design intention is to make the high temperature generated by the drill point quickly flow out of the cutting area. The specific method is to machine a hole in the drill body axis, insert a hole with rapid heat transfer Copper tube A large amount of heat generated during cutting can be quickly transferred to the coolant in the copper pipe of the drill body, making the coolant become hot, resulting in steam, greatly reducing the cutting temperature, thus improving the life of the drill bit. The test results show that the life of the bit can be increased by 40%~60%. In order to facilitate use without reducing efficiency, the company has made some structural improvements: directly inject water into the shaft hole screw Just plug it. It is said that this new concept bit has a good market prospect in dry drilling.