刀柄—热缩刀杆—刀具系统切削性能的研究

发布时间：2018-03-29 07:09

本文选题：大型深型腔模具　切入点：热缩刀杆　出处：《湘潭大学》2017年硕士论文

【摘要】：刀柄-热缩刀杆-刀具系统具有结构简单、夹持强度高、高夹持稳定性和抗弯刚度、有较好的的回转平衡性和易于到达工件型腔底部等特点,现已成为大型深型腔模具精加工和半精加工的主要方法之一。目前,关于刀柄-热缩刀杆-刀具系统在实际切削过程中切削参数的研究还比较少,对其在高速切削加工时的切削性能有待深入研究。本文以P20模具钢为高速铣削加工对象,通过正交试验对刀柄-热缩刀杆-刀具系统的加工表面粗糙度进行了研究,分析了刀具悬伸长度、主轴转速、铣削深度、铣削宽度和每齿进给量等加工参数对工件表面粗糙度的影响。结果表明,五个参数都是高度显著的,对P20模具钢铣削表面粗糙度影响最大的因素是铣削宽度,然后依次是每齿进给量?z,刀具悬伸长度L,主轴转速n和铣削深度。在正交试验结果的基础上,采用多元线性回归分析方法建立了刀柄-热缩刀杆-刀具系统加工表面粗糙度预测模型,并对预测模型和回归系数进行了显著性检验,结果表明所建模型高度显著。并且对模型预测值与实际测量值进行了对比,预测误差在1.58%-16.72%之间,具有较高的预测精度。利用有限元软件ANSYS分析刀具悬伸长度对给定径向力作用下热缩刀杆节点的最大等效应力的影响;分析了在给定径向力作用下,刀具悬伸长度对刀柄-热缩刀杆-刀具系统节点的最大偏移量的影响。使用不同刀具悬伸长度的刀柄-热缩刀杆-刀具系统进行高速铣削加工,研究了刀具悬伸长度对刀具磨损、高速铣削过程中铣削力以及表面粗糙度和表面形貌的影响。在相同的切削参数下,使用弹簧夹头刀柄和热缩刀杆A和B两种不同型号的热缩刀杆进行高速铣削试验。测量三种刀具系统在不同铣削时间之后的刀具底刃磨损情况、铣削力的变化、工件表面粗糙度以及工件表面形貌,通过比对可以发现,热缩刀杆B的各项性能都优于其他两种夹持元件。
[Abstract]:With simple structure, high clamping strength, high clamping stability and bending stiffness, the shank-hot shrinkage cutter-tool system has the advantages of good rotation balance and easy access to the bottom of the workpiece cavity, etc. It has become one of the main methods for finishing and semi-finishing of large deep cavity die. At present, the research on cutting parameters of shank, heat shrinkage tool rod and tool system in actual cutting process is relatively few. The cutting performance of P20 die steel in high speed cutting needs to be studied deeply. In this paper, the machining surface roughness of the tool shank, heat shrinkage tool rod and tool system is studied by orthogonal test, taking P20 die steel as the object of high speed milling. The influence of cutting parameters, such as tool length, spindle speed, milling depth, milling width and feed rate per tooth, on the surface roughness of the workpiece is analyzed. The results show that the five parameters are highly significant. The most important factor affecting the surface roughness of P20 die steel milling is milling width, followed by feed quantity per tooth. Based on the results of orthogonal test, the prediction model of machining surface roughness of cutter shank, heat shrinkage tool rod and tool system is established by using multiple linear regression analysis. The results show that the model is highly significant, and the prediction error is between 1.58% and 16.72%, compared with the actual measured value, and the prediction error is between 1.58% and 16.72%, and the prediction error is between 1.58% and 16.72%, and the prediction error is between 1.58% and 16.72%. The finite element software ANSYS is used to analyze the effect of tool elongation on the maximum equivalent stress of a given radial force, and the maximum equivalent stress at a given radial force is analyzed. The influence of tool suspension elongation on the maximum offset of the node of the cutter shank-heat shrinkage cutter rod-tool system. The tool shank-heat shrinkage cutter rod-tool system with different tool length is used for high speed milling. The effects of tool elongation on tool wear, milling force, surface roughness and surface morphology during high speed milling were studied. High speed milling experiments were carried out by using two different types of hot shrinkage cutter stem A and B with spring chuck shank and heat shrinkage cutter rod. The wear of bottom edge and the change of milling force of the three cutting tool systems were measured after different milling time. The surface roughness and the surface morphology of the workpiece show that the thermal shrinkage tool rod B has better performance than the other two kinds of clamping elements.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG54

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