磨鞋单齿正交切削三维力学模型分析
2018-11-12
作者：孙林平，伍世云，潘刚，崔怀丰
单位：四川文理学院
摘要：磨鞋是对井内落物进行磨铣的主要工具，其结构的合理性是提高磨铣效率的主要手段。本文从磨鞋单齿切削原理入手，综合考虑剪切面和侧剪切面的剪切作用，建立磨鞋单齿正交切削模型，得出磨鞋切削时的主切削力和主切削力矩的计算公式。基于JC本构方程建立磨鞋单齿切削有限元模型，得到磨鞋单齿主切削力的仿真解，并分别对比三维正交模型计算得出的主切削力值和二维平面下的平面应变模型值，验证了推导计算公式的准确性与可靠性。通过案例分析得出不同落物材料、齿前角等参数对主切削力的影响规律，给出了齿前角的推荐优化值为-15°或+10°。
关键词：磨鞋；正交切削；切削力；布齿规律
中图分类号：TG501.1；TH162 文献标志码：A
Analysis of Threedimensional Mechanical Model of Singletooth Orthogonal Cutting
Sun Linping，Wu Shiyun，Pan Gang，Cui Huaifeng
Abstract:Grinding shoes is the main tool for grinding the lining in the well，the rationality of the structure is the main means to improve the milling efficiency.Starting from the working principle of singletooth cutting，considering the shearing effect of shear plane and side shear plane，the orthogonal cutting model of the grinding shoe is established，and the calculation formula of the main cutting force and the main cutting moment of the grinding shoe are obtained.Based on the JC constitutive equation，the finite element model is established to obtain the simulation solution of the main cutting force.The results show that the accuracy and reliability of the derivation formula are verified by comparing the main cutting force values calculated by the threedimensional orthogonal model and the plane strain model values under the twodimensional plane.Finally，the influence of different parameters such as the falling material and the tooth front angle on the main cutting force is obtained through the case analysis，and the recommended value of the tooth angle is given as -15 ° or + 10 °.
Keywords:grinding shoes；orthogonal cutting；cutting force；cloth tooth rule