大型螺纹旋风硬铣削数值模拟及工艺参数优化

发布时间：2018-06-02 04:00

本文选题：螺纹旋风硬铣削 + 热力耦合　；参考：《浙江大学》2016年硕士论文

【摘要】：大型螺纹旋风硬铣削技术是多刀具断续渐进式成型切削,使得其切削特性不同于一般的切削方式。本文以新型螺纹旋风硬铣削技术为研究对象,从旋风硬铣削方法、热力耦合等角度展开优化研究,进行深入分析。首先,介绍了旋风铣削运动的原理,从几何学的角度利用坐标转换的方法对旋风硬铣削工艺的加工机理进行解析,建立了刀具廓形与螺纹滚道法向廓形的转换关系,详细阐述了螺旋滚道成形机理。同时,对旋风硬铣削切屑形成、工艺参数、误差成因进行了分析,为后续研究打下了基础。随后,对旋风硬铣削的动力学与热力耦合技术进行理论分析,构建了硬铣削系统的动力学模型,分析了硬铣削切削变形的铣削力与铣削热模型,建立了热力耦合的热弹塑性有限元控制方程,并对硬铣削的热力耦合过程进行了分析。然后,建立了硬铣削加工仿真简化模型,运用金属切削专用软件DEFORM-3D,将数值模拟技术与实验设计方法结合,针对铣削三要素进行正交实验设计,对模拟结果进行极差分析研究工艺参数对铣削热与铣削力的影响,综合考虑最大铣削热、最大主铣削力、最大有效铣削力等指标,获取了最优的参数组合。最后,对硬铣削工艺参数进行了研究。针对粒子群算法存在的缺陷,对其进行了改进优化,并将其与灰色关联度结合对应用到旋风硬铣削工艺参数的多目标优化问题中,取得了良好的效果。对旋风硬铣削工艺的推广具有重要意义。结尾在总结论文主要研究内容和研究成果的基础上,对未来进一步研究的前景做出了展望。
[Abstract]:The whirlwind hard milling technology of large screw thread is a multi-tool intermittent progressive cutting, which makes its cutting characteristics different from the common cutting methods. In this paper, a new type of whirlwind hard milling technology is taken as the research object. The optimization research is carried out from the point of view of whirlwind hard milling method and thermodynamic coupling, and the further analysis is carried out. Firstly, the principle of whirlwind milling is introduced, the machining mechanism of whirlwind hard milling technology is analyzed by coordinate transformation method from the angle of geometry, and the relationship between tool profile and thread rolling normal to profile is established. The forming mechanism of spiral raceway is described in detail. At the same time, the formation, process parameters and error causes of cyclone hard milling chip were analyzed, which laid a foundation for further research. Then, the coupling technology of dynamics and thermodynamics of whirlwind hard milling is analyzed theoretically, the dynamic model of hard milling system is constructed, and the milling force and heat model of hard milling deformation are analyzed. The thermoelastic-plastic finite element control equation of thermo-mechanical coupling is established, and the thermo-mechanical coupling process of hard milling is analyzed. Then, a simplified model of hard milling simulation is established. The numerical simulation technology is combined with the experimental design method, and the orthogonal experimental design for the three elements of milling is carried out by using the special metal cutting software DEFORM-3D. The influence of process parameters on milling heat and milling force is studied by means of range analysis of simulation results. The optimal parameter combination is obtained by considering the indexes of maximum milling heat, maximum main milling force and maximum effective milling force. Finally, the process parameters of hard milling are studied. Aiming at the defects of particle swarm optimization (PSO), this paper improves and optimizes it, and applies it to the multi-objective optimization problem of whirlwind hard milling process parameters by combining it with grey correlation degree, and obtains good results. It is of great significance for the popularization of whirlwind hard milling technology. At the end of this paper, based on the conclusion of the main research contents and research results, the prospect of further research is prospected.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG54

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