错齿BTA钻头刀体扭转强度模拟分析与实验研究

发布时间：2018-06-05 05:11

本文选题：错齿BTA钻头 + 有限元分析　；参考：《机械科学与技术》2017年03期

【摘要】：错齿BTA钻头刀体结构复杂,在钻削过程中既要承受较大的钻削力,又要具有足够大的排屑空间,解决刀体强度与排屑能力之间的矛盾是实现错齿BTA钻头优化设计的关键。采用有限元模拟分析与实验相结合的方法,对核电管板加工用错齿BTA钻头在扭转载荷作用下刀体强度及其应力应变分布特征进行了研究。结果表明:现有的错齿BTA钻头刀体在外齿根部与刀体中心两个排屑通道之间的横筋处为薄弱环节,存在较为严重的应力集中现象,扭矩实验中裂纹的产生部位与有限元模拟分析结果一致。通过采用形状优化及拓扑结构优化的方法对刀体薄弱环节进行优化改进,实现了刀体强度与排屑能力的综合优化,提高了错齿BTA钻头管板深孔加工效率。
[Abstract]:The structure of BTA bit with staggered teeth is complex. In the process of drilling, it is necessary to bear large drilling force and to have enough chip-removing space. It is the key to realize the optimum design of staggered BTA bit to solve the contradiction between the strength of the cutter and the ability of chip removal. By means of finite element simulation and experiment, the strength and stress and strain distribution characteristics of BTA bit with staggered teeth used in nuclear power tube plate processing under torsional load are studied. The results show that the transverse ribs between the two chip-removing channels in the outer tooth root and the center of the existing staggered BTA bit are weak links, and there is a serious stress concentration phenomenon. The location of the crack in torque experiment is consistent with the result of finite element simulation. By using the methods of shape optimization and topology optimization, the weak links of the cutter body are optimized and the comprehensive optimization of the strength and chip removal ability of the cutter body is realized, and the machining efficiency of the deep hole in the tube plate of the BTA bit with mismatched teeth is improved.
【作者单位】：西安理工大学机械与精密仪器工程学院;
【基金】：国家科技重大专项(2013ZX04009011)资助
【分类号】：TG52

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