损伤容限型钛合金正交车铣和车削切削加工性对比研究

Contrast Cutting Machinability between Orthogonal Turn-milling and Turning of Damage-tolerant Titanium Alloy

损伤容限型钛合金TC21广泛用于制造新型战机中重要的承力部件,但较差的切削加工性掣肘了其加工效率和加工质量的提高。采用单因素切削试验法,从切削力、切削温度、刀具耐用度和已加工表面完整性等方面探讨TC21钛合金车削和正交车铣的切削加工性。结果表明,相对于车削,正交车铣通过铣刀的高速旋转和断续切削,可有效降低切削力和切削温度,在材料去除率大于车削的情况下,仍能获得优于车削的刀具耐用度和已加工表面完整性。研究结果对于提高TC21钛合金等难加工材料的加工效率和加工质量具有实际应用价值。

Damage-tolerant titanium alloy TC21 is widely used in various important load-bearing parts of new aircraft,but its poor cutting machinability hinders improvement of processing efficiency and quality.In this work,cutting machinability of TC21 in turn-milling and turning is analyzed by single factor experimental way in some aspects such as cutting force,cutting temperature,tool life and machined surface integrity.The results show that orthogonal turn-milling is good for reducing cutting force and cutting temperature by the processing of high speed cutting and interrupted cutting,and it can obtain better tool life and machined surface integrity than turning of TC21 though cutting efficiency of turn-milling is higher than turning.The research has practical application value for improving processing efficiency and quality of hard-to-machine material such as TC21.