我们在加工中遇到一种特殊的大头螺钉,(如图1所示)。螺纹直径M5,螺纹长度短,头大,大端外圆φ15.5,厚0.5毫米。材料为奥氏体不锈钢1Cr 18Ni 9Ti,属于难加工材料之一。在车床上加工完外圆,端面和螺纹后,在卧式铣床上铣通槽,槽宽1.2、深1.2,按一般的加工方法加工异常困难。我们设计了如图2所示的夹具,一次装夹两个工件,提 We encountered in the processing of a special type of screws, (Figure 1). Thread diameter M5, thread length short, big head, large end of the outer diameter φ15.5, thickness 0.5 mm. The material is austenitic stainless steel 1Cr 18Ni 9Ti, which is one of the most difficult to machine materials. After machining the outer circle, the end surface and the thread on the lathe, the milling groove is milled on the horizontal milling machine, the groove width is 1.2 and the depth is 1.2. The machining is abnormally difficult according to the general processing method. We designed the fixture shown in Figure 2, two workpieces to be mounted at a time