钻削GH4169高温合金薄壁件钻削力仿真研究

Simulation Research on Drilling Force of Drilling High Temperature Alloy GH4169 Thin-walled Parts

GH4169高温合金的薄壁钻孔与厚壁钻孔相比有特殊性,运用ABAQUS软件进行钻削GH4169高温合金薄壁件的仿真,研究钻削加工过程中钻削参数和工件厚度对钻削力的影响规律及变化特征,分析应力的分布规律。结果表明:钻削初期,横刃的挤压和主切削刃切削长度的增加使钻削力和扭矩增大;稳定钻削阶段,横刃切出后,主切削刃切削长度不变切削直径增加,钻削力和扭矩稳定增加;钻削后期,副切削刃参与切削,主切削刃切削长度减小,轴向钻削力和扭矩减小,但副刃与孔壁的挤压摩擦,曲线波动较大;钻削速度、进给量及工件厚度的增加都会导致轴向钻削力和扭矩的增加;钻削时的最大应力分布在横刃和主切削刃与工件的接触部位。

The thin-walled drilling of superalloy GH4169 is special compared with thick-walled drilling.In this paper,the ABAQUS software is used to simulate the thin-walled parts of high-temperature alloy GH4169.The influences and variation characteristics of drilling parameters and workpiece thickness on the drilling force during the drilling process are studied.The distribution of stress is analyzed.The results show that:in the initial stage of drilling,the cutting length of the main cutting edge and extrusion of the chisel edge drilling force and torque are increased,and the drilling stage is stabilized.After the chisel cutting,the cutting length of the main cutting edge does not change,and the drilling force and torque are steadily increased.In the later stage of drilling,the auxiliary cutting edge participates in the cutting,and the reduced cutting length of the main cutting edge makes the decrease of the axial drilling force and the torque.But due to the extrusion friction between the minor cutting edge and the hole wall,there are large fluctuations;the increase of drilling speed,feed rate and workpiece thickness will lead to an increase in axial drilling force and torque;the maximum stress during drilling is distributed at the contact between the chisel edge and the main cutting edge and the workpiece.