Finite Element Simulations of Temperature Fields and Stress Fields in Laser Cladding Repair Processes of Milling Cutter Disks

Abstract

Abstract: In order to determine whether thermal stress cracking would occur during laser cladding repair processes of milling cutter disks， the three-dimensional temperature fields and stress fields of the milling cutter disks were simulated.The three-dimensional repair model of milling cutter disks was established based on the characteristics of the damage failures. The grid model and boundary conditions of the repaired milling cutter disks were established by using hexahedral structured meshing method. The laser cladding processes of milling cutter disks were reappeared by combining the live and death element technology with the ANSYS APDL self-programming technology. The researches showed that, the high temperature gradient and geometrical constraints resulted in high residual thermal streses in the repaired areas.The maximum residual thermal stress is as 384 MPa. The applications show that the milling cutter disks do not crack after repaired, and the repair effectiveness is good, which verifies the correcteness of the simulation.

Key words: milling cutter disk, laser cladding, repair, live and death element technology, ANSYS APDL self-programming technology

摘要： 为了判定铣刀盘激光熔覆修复过程是否会发生热致应力开裂的问题，对铣刀盘激光熔覆修复过程的三维温度场和应力场进行模拟。根据铣刀盘损伤特征建立铣刀盘的三维修复模型，利用结构化网格划分方法构建修复后的铣刀盘分析模型及边界，将单元生死技术和ANSYS APDL自编程序相结合，重现铣刀盘激光熔覆修复成形过程。研究表明，大温度梯度和几何约束限制使刀盘修复部位产生高的残余应力，最大值为384 MPa。实际应用表明，铣刀盘修复后未产生开裂缺陷，修复效果良好，验证了仿真的正确性。

关键词: 铣刀盘, 激光熔覆, 修复, 单元生死技术, ANSYS APDL自编程序

CLC Number:

TG404

SHU Linsen1,2;WANG Jiasheng1. Finite Element Simulations of Temperature Fields and Stress Fields in Laser Cladding Repair Processes of Milling Cutter Disks[J]. China Mechanical Engineering.

舒林森1,2;王家胜1. 铣刀盘激光熔覆修复过程的温度场与应力场有限元仿真[J]. 中国机械工程.

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