铍材机加应力沿层深分布规律

采用X2 0 0 1应力分析仪测试了铍材经车加工和铣加工后的残余应力 ,研究了机加工参数对残余应力的影响及残余应力消除方法。结果表明 ,车加工和铣加工均使铍材表层产生压应力 ,随进刀量和吃刀深度的增加 ,压应力逐渐增大 ,其范围在 10 0～ 2 0 0MPa之间。化学蚀刻是消除铍材机加应力的有效方法。化学蚀刻后逐层测试所得应力沿深度分布与用多波长法测试结果趋势一致 ,大小略有差异

STUDY ON DISTRIBUTION OF MACHINING RESIDUAL STRESS FOR BERYLLIUM MATERIAL

By use of X2001 stress analyzer,the machining residual stress for beryllium material was measured. The influence of machining parameters on the stress and the methods for stress relieving were studied. The results showed that the compressive stress in surface layer of machined beryllium material was resulted from both turning and milling, and increases gradually with the increasing of cutting and feed depths. The chemical etching was an effective way for relieving of machining residual stress. The distribution of residual stress along depth gained through layer by layer measuring method after chemical etching is in line with that measured by multi wavelength method.