It can be said that at present, we have been able to design more reasonable and more perfect drill tip parameters according to the processing needs, and use the semi-full automatic CNC tip grinding machine to efficiently and accurately mass produce multi-blade sharp group drill series products. Further research and promotion of group drills, from hardware to software, can provide sustainable development. The group drills invented in China will certainly occupy a certain position in the domestic and foreign markets.
In addition to the drill type, the twist drill is also constantly innovating in the groove type. In the 1970s, Jiangxi Tool Factory developed and produced a deep hole twist drill with a parabolic tooth back. The combination of the blade type and the deep hole twist drill achieves better results. Due to the thick core and good rigidity, the largest chip space is obtained while maintaining the strength of the cutter teeth. By properly grinding the chisel edge, the group drill with the large apex angle and the concave arc edge is more favorable for chip removal. It can drill deep holes with a length to diameter ratio of 15 and a working life of 3-4 times that of ordinary twist drills.
With the maturity of China's high-speed deep grinding technology, internally cooled twist drills have provided the market one after another. Since the end of the 20th century, solid carbide internal cooling twist drills have been used to process cast iron and steel. The carbide drill bit of the welding head can reduce the cost of the drill bit, can be re-grinded many times, and the machine clamp is not re-grinding the drill bit is also beginning to be applied.
Since the 21st century, machine-clamped carbide internal cooling drills with crowns have been used, which can greatly improve the drilling efficiency by using the new TiAlN coated inserts. It can use a cutting speed of 100m/min and a feed rate of 0.25~0.3mm/r. The amount of knife. At present, the use of hard alloy high-speed drilling is not limited to the processing of cast iron parts. It has been proved that alloy steel, stainless steel, especially the quenched and tempered steel with higher hardness, is a better process plan with high-speed drilling of hard alloy. Greatly improved.
In 2009, the affiliated factory of Shanghai University of Technology customized a multi-axis large-scale CNC drilling and milling machine, using high-speed internal cooling and machine-clamping bit processing technology to estimate the processing efficiency can be further increased by 10 times. How to use the advantages of group drilling in these occasions, and to study the blade shape suitable for high-speed drilling of cemented carbide, and the sharpening process of these drill types, etc., can be listed as topics for future research. I believe that the research and development of the group drill will continue to develop and make new contributions to the motherland becoming a manufacturing powerhouse!
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