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中文摘要：
目前现代深孔加工技术领域中长径比UDI〉20以上的等直径或两端大中间小超长通深孔加工已比较成熟，但对于两端小中间大，中部带有圆柱面、锥面、球面等复杂曲面的超长异形通深孔，即所谓的‘大肚子’孔零件大幅扩孔、粗精镗削加工没有得到解决。针对这一难题，开发设计了一种具有防振、自导向功能的高效精密变径镗刀。详细介绍了此种精密变径镗刀的结构特点、设计原理、装配使用情况。在实践中取得了良好的使用效果。
英文摘要：
At present,the super-deep hole which has a same aperture or a samll center and big endscould enlarge well in the realm of modern deep hole processing technology,wntte tne oetttea aeep hole with a big center and both small ends which has a special surface in the middle ,such as cylndrical surface, conical surface and spherical surface can not manufacture.Based on this problem, this paper develops and designs a special high precision adjustable boring cutter with antihunting and self-directed function.Details of such precision adjustable boring cutter of the structure,design principle,assembly use is introduced. In practice ,the processing achieved excellent results.
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