Suggestions are given in the paper that the improvement of numerical control machining technique level should be fastened, so as to manufacture pistons with good quality and performance.
文中建议加快提高内燃机车活塞的数控加工技术水平，以制造出具有良好质量和性能的活塞。
Adopting the computerized Numerical Control Technique to machine the breakage groove of torshear type bolts can improve the machining precision of groove, guarantee the assembled quality.
扭剪型螺栓破断沟槽的加工采用数控技术、提高沟槽加工精度，确保配套质量；
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