直纹曲面的线切割工艺与表面粗糙度研究

发布时间：2018-07-11 15:52

本文选题：电火花线切割 + 直纹曲面　；参考：《燕山大学》2015年硕士论文

【摘要】：随着科学技术的不断发展,各行业中需要一些批量不大、精度要求高的空间曲面零件,仅仅依靠传统的切削方法很难满足这些零件的加工需求。在我国传统高速走丝电花线切割机床上,附加数控回转装置使工件实现转、摆联动是加工空间直纹曲面的有效方法之一。(1)根据空间直纹曲面电火花线切割加工的运动规律及加工特点,利用CAM软件五轴加工模块实现了符合线切割特点的复杂直纹曲面的识别以及刀路计算,解决了以往手工编程的难题,并对其后置处理算法进行了推导。(2)建立了极坐标加工坐标系,在该坐标系下对线切割直纹曲面的相对速度进行了分析,通过建立该坐标系通用数学模型推导了几种基本运动形式下所形成的典型直纹曲面各点的相对速度规律。(3)根据线切割加工直纹曲面的要求,设计了一种小型数控回转工作台以满足工业生产的需要,对其机械结构与控制部分进行了详细讨论。(4)利用高速走丝线切割机床进行了锥度切割实验以及平面切割实验,探究切割速度对表面粗糙度的影响;利用有限元软件,在强对流换热条件下模拟了移动热源的温度场得到了放电凹痕的大致形状,并根据模拟结果建立了其表面形貌数学模型。
[Abstract]:With the development of science and technology, many kinds of space curved surface parts with small batch and high precision are needed in various industries. It is difficult to meet the machining requirements of these parts only by traditional cutting methods. In the traditional high speed wire wire-cutting machine tool in our country, the workpiece can be rotated by adding numerical control rotary device. Pendulum linkage is one of the effective methods for machining spatial straight line surface. (1) according to the motion law and machining characteristics of EDM, Using the CAM software five-axis machining module to realize the recognition of complex straight surface and the calculation of cutter path which accord with the characteristics of linear cutting, and solve the difficult problem of manual programming in the past. The post processing algorithm is deduced. (2) the polar coordinate system is established, and the relative velocity of linear cutting straight surface is analyzed in this coordinate system. By establishing the general mathematical model of the coordinate system, the relative velocity law of the typical straight surface formed under several basic motion forms is derived. (3) according to the requirements of linear cutting machining straight line surface, A small NC rotary table is designed to meet the needs of industrial production. The mechanical structure and control part are discussed in detail. (4) Taper cutting experiments and plane cutting experiments are carried out by using high-speed wire-line cutting machine tools. The influence of cutting speed on surface roughness was investigated, and the approximate shape of discharge indentation was obtained by using finite element software under the condition of strong convection heat transfer, and the mathematical model of surface morphology was established according to the simulation results.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG484

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