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我厂产品中有个零件如图1所示,两平行孔相互交错,技术要求2-φ11孔平行度为0.15,材料是球墨铸铁,我们采用钻孔—铰孔工艺。由于两孔互相交错1.1mm,第二孔无法直接加工。我们先加工第一孔,然后堵死第一孔,再加工第二孔:再压出第一孔内心棒.无论采用钢质棒还是铸铁棒都很难保证要求,成品率只有40％,而且每件消耗一个心棒。后来我试用了第一孔插淬硬导向销(如图2)加工第二孔,又设计了在车床土用的酣转180°夹具(如图3),一次装夹,两头钻铰,第一孔完工塞淬硬导向销再加工第二孔。经过成批生产,成品率达到90％以上,每个导向销可加工100件以上。
I have a factory product parts shown in Figure 1, the two parallel holes intertwined, the technical requirements of 2-φ11 hole parallelism of 0.15, the material is ductile iron, we use drilling - reaming process. As the two holes are staggered 1.1mm, the second hole can not be processed directly. We first process the first hole, and then blocked the first hole, and then processing the second hole: then press out the first hole core rod. Whether steel or cast iron rods are difficult to guarantee the request, the yield is only 40%, and Each consumes one heart. Later, I experimented with the first hole hardened guide pin (Figure 2) processing the second hole, but also designed in the lathe soil rotation 180 ° fixture (Figure 3), a fixture, two drill hinge, the first A hole finished plug hardened guide pin and then processing the second hole. After mass production, the finished product rate reaches more than 90%, each guide pin can process more than 100 pieces.