Development of a new tool to generate compressive residual stress within a machined surface
Development of a new tool to generate compressive residual stress within a machined surface
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DOI：
10.1016/j.ijmachtools.2004.03.010
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发表时间：
2004-09
影响因子：
14
通讯作者：
T. Segawa;H. Sasahara;M. Tsutsumi
中科院分区：
文献类型：
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作者：
T. Segawa;H. Sasahara;M. Tsutsumi
一般来说，关键的机加工零件，如飞机零件，需要高疲劳强度和抗应力腐蚀开裂。这些加工零件在铣削后几乎都在加工表面有拉伸残余应力。然而，如果仅通过铣削加工即可获得加工表面内的压残余应力，则有望提高加工部件的疲劳强度和抗应力腐蚀开裂能力。本研究的目的是开发一种新的刀具，可以在铣削过程中同时在加工表面产生压缩残余应力。该工具具有用于材料去除的切削刃和用于抛光过程的投影销。结果表明，该刀具在铣削加工过程中能够在加工表面产生有效的残余压应力。加工表面残余应力水平在−100 ~−200 MPa之间，表面以下0.05 mm处残余应力水平在−300 ~−400 MPa之间。这些水平几乎与喷丸强化工艺所获得的水平相当。
Generally, critical machined parts such as aircraft parts require high fatigue strength and resistance to stress corrosion cracking. These machined parts almost all usually have tensile residual stress within the machined surface after milling. However, if the compressive residual stress within the machined surface can be obtained by a milling process alone, it is expected that fatigue strength and resistance to stress corrosion cracking of the machined components will be improved. The purpose of this study is to develop a new tool that can generate compressive residual stress within the machined surface concurrently with the milling process. This tool has cutting edges for material removal and a projection pin for a burnishing-like process. It was shown that the proposed cutter could generate effective compressive residual stress within the machined surface during the milling process. Residual stress levels were in the region of −100 to −200 MPa on the machined surface, and −300 to −400 MPa at 0.05 mm beneath the surface. These levels are almost comparable with those obtained by the shot peening process.