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摘要随着螺纹旋铣加工技术的发展，对加工中切削力、温度场和残余应力的研究十分必要，而然目前对螺纹硬态旋铣过程的研究却较少。本文根据刀具工件的材料属性、Johnson-Cook本构模型、刀屑摩擦、材料失效准则及损伤演化、切削的热传递在ABAQUS中建立螺纹硬态旋风铣过程的二文有限元切削模型，处理了切屑的尖角的网格划分问题，对切削过程中的切削力、温度场以及残余应力分布进行了研究。由仿真结果可知切削力最大值在切削最大深度处，且切削力随最大切削深度和切削速度的增加而增大。温度场最大温度先增大后趋于稳定，随切削深度及切削速度增大而增大，随前角由5°到9°的增大而稍有减小。切削速度为4m/s时，形成了锯齿切屑，切削力及切削最大温度出现明显周期性波动。冷却前后残余应力明显减小，冷却后获得残余压应力，最大值约在加工表面下0.005mm处。30459
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关键词 螺纹旋铣 有限元 切削力 切削温度 残余应力
毕业论文设计说明书外文摘要
Title Finite Element Simulation of Hard Cutting Based on ABAQUS
Abstract
AS the innovation in thread whirling machining ,researches on the cutting force,temperature distribution and residual stress are essential.However,works on thread whirling remain scarce.A planner finite element model(FEM) has been created in ABAQUS to analyze hard whirling.The FEM was developed based on material properties,Johnson-Cook constitutive model,tool-chip interface friction,chip separation criterion,damage evolution and heat transfer.The mesh on the sharp corner of the chip was settled to simulate and study the cutting force,temperature distribution and the residual stress in cutting process.The maximum of a cutting force curve is around the maximum cutting depth.The cutting force increases as the maximum cutting depth increases.The maximum temperature in temperature distribution increases first and then tends to be stable, which increases obviously as cutting depth and cutting speed increase,while decreases by a small margin as the rake angle increases from 5°to 9°.The saw-tooth chip can be formed when cutting speed is 4m/s. The cutting force and maximum temperature fluctuate during saw-tooth chip formation.The residual stress decreases obviously after cooling.Residual compressive stress was obtained after cooling.The maximum of residual stress is about 0.005mm beneath work-piece surface.
Keywords hard whirling，finite element model，cutting force，temperature distribution， residual stress
目 次
1 绪论 1
1.1 引言 1
1.2 课题来源 1
1.3 硬态切削技术 1
1.4 课题研究方法现状 2
1.5 课题主要研究内容及意义 3
2 螺纹硬态旋风铣削有限元建模 5
2.1 引言 5
2.2 有限元方法概述及ABAQUS软件 6
2.3 几何模型的建立 10
2.4 材料属性及本构模型 13
2.5 材料失效准则 14
2.6 刀屑接触与传热 17
2.7 小结 20
3 基于ABAQUS的螺纹旋风铣有限元仿真结果析 21
3.1 引言 21
3.2 切削力的仿真结果及分析 21
3.3 温度场的仿真结果及分析 25
3.5 残余应力的仿真结果及分析 28
3.6 小结 29
结论与展望 30
致谢 31
参考文献 32
1 绪论
1.1 引言
近年来随着高温合金、淬硬钢、钛合金等高硬度材料的发展，其优异的材料性能使这些材料广泛应用于军工、航空航天及各类民用生产制造领域。对高硬度难加工金属材料的加工需要，促使硬态切削技术的快速发展。硬态切削的加工效率较高，硬态切削中通常使用的聚立方氮化硼（PCBN）刀具具有高硬度和高耐磨性，可得到较为理想的表面加工质量。