硬质合金YG6的电火花线切割加工工艺参数研究

发布时间：2018-06-12 01:42

本文选题：电火花线切割 + 电参数　；参考：《太原理工大学》2015年硕士论文

【摘要】：高速走丝电火花线切割在当代机械加工制造行业中的应用越来越广泛，特别是在机械电子、兵器制造、航天工业以及仪器仪表等行业发挥着不可替代的作用。我国作为首先研发并制造出高速走丝电火花线切割机床的国家，已经在机床构造、技术水平以及工艺参数等方面具有进行了研究并取得了一定的发展。人们对产品的制造精度，表面质量不断提出更严格的要求，因此对相关领域模具的制造精度，高硬度，高耐磨性和高耐腐蚀性要求也不断提高。硬质合金因其良好的物理机械性能和化学稳定性的特性在模具制造行业的应用日益广泛，但是，由于其高硬度，韧性差的特性，一般的机械加工基本不可行，因此电火花线切割是加工硬质合金模具的首选方法。研究硬质合金电火花线切割的加工电参数，对提高硬质合金的加工效率和加工质量具有重要的现实意义。本文综合分析了影响高速走丝电火花线切割硬质合金YG6加工质量的因素。通过多种试验方法分析得到电参数与加工效率以及加工质量之间的关系。根据电火花线切割的加工原理以及通过试验数据的详细分析，得出加工硬质合金时，高效率、高精度的最优电参数组合。本文首先采用单因素实验法，选取各个电参数适当的范围，进行试验并记录试验数据。根据试验数据绘制相应的曲线图表，然后得出各个电参数对加工速度以及表面粗糙度的影响规律。其次根据单因素试验的试验结果，选定各个电参数适当的范围，进行正交试验，记录试验数据并运用极差分析对试验数据进行分析，得到各个电参数对加工速度以及表面粗糙度的影响大小的顺序，计算分析得出最优电参数组合，根据各个电参数对加工速度与表面粗糙度影响的趋势，推测出一组新的电参数组合，分别验证两组试验的加工速度与表面粗糙度，通过对记录与测量得到的试验数据进行比较得出较好的试验电参数组合，即表面粗糙度达到最小值时，最优电参数组合，以及加工速度达到最快时的最优电参数组合。最后为了更好地了解各个电参数在加工硬质合金YG6的过程中对加工速度以及表面粗糙度的具体影响比重，对正交试验结果进行了方差分析，得到各个电参数对提高加工速度以及降低表面粗糙度值的贡献率，即影响率，实现了各个电参数对试验指标的量化分析。根据试验要求，以及各个电参数贡献率的具体情况，设定不同的电参数组合，从而可达到较快的工件加工速度，或者较高加工精度要求。本文通过大量的试验，不仅通过单因素试验得到各个电参数对加工速度以及表面粗糙度的影响规律，而且根据试验情况设计正交试验，，并通过大量正交试验的数据分析，得到各个电参数对试试验试验验指标的影响大小顺序。为以后硬质合金YG6材料线切割加工提供了更好的依据。
[Abstract]:High speed wire WEDM (WEDM) has been widely used in modern machining industry, especially in the fields of mechanical electronics, weapon manufacturing, spaceflight industry and instrumentation and so on. As the first country to develop and manufacture high speed WEDM machine tools, our country has studied the machine tool structure, technical level and technological parameters, and has made some progress. The surface quality is more stringent, so the manufacturing precision, high hardness, high wear resistance and high corrosion resistance of the die in related fields are also improved. Cemented carbide is widely used in die manufacturing industry because of its good physical and mechanical properties and chemical stability. However, because of its high hardness and poor toughness, general machining is not feasible. Therefore, WEDM is the preferred method for machining cemented carbide dies. Study on Electrical parameters of WEDM for cemented Carbide, It is of great practical significance to improve the machining efficiency and quality of cemented carbides. In this paper, the factors affecting the machining quality of YG6 cemented carbides with high speed wire WEDM are comprehensively analyzed. The relationship between electrical parameters, machining efficiency and machining quality is obtained through various test methods. According to the principle of WEDM and the detailed analysis of test data, the optimal electrical parameters combination of high efficiency and high precision are obtained in the machining of cemented carbides. Select the appropriate range of electrical parameters, test and record the test data. According to the test data, the corresponding curve diagram is drawn, and then the influence of each electrical parameter on machining speed and surface roughness is obtained. Secondly, according to the test results of single factor test, the proper range of each electrical parameter is selected. The orthogonal test was carried out, the test data were recorded and the test data were analyzed by the range analysis. The order of the influence of each electric parameter on the machining speed and the surface roughness was obtained, and the optimum electric parameter combination was obtained by calculation and analysis. According to the trend of the influence of electrical parameters on machining speed and surface roughness, a new set of electrical parameters is deduced to verify the machining speed and surface roughness of the two groups of experiments, respectively. Through the comparison of the test data recorded and measured, a better combination of experimental electrical parameters is obtained, that is, when the surface roughness reaches the minimum value, the optimal combination of electrical parameters is obtained. Finally, in order to better understand the specific effects of each electrical parameter on the machining speed and surface roughness in the process of machining cemented carbide YG6, The variance analysis of the results of orthogonal test shows that the contribution rate of each electric parameter to increase the machining speed and reduce the value of surface roughness, that is, the influence rate, has been realized, and the quantitative analysis of each electrical parameter to the test index has been realized. According to the test requirements and the specific conditions of the contribution rate of each electric parameter, different electric parameter combinations can be set to achieve faster workpiece processing speed or higher machining precision requirement. In this paper, a large number of experiments have been carried out. Not only the influence of electrical parameters on machining speed and surface roughness is obtained by single factor test, but also the orthogonal test is designed according to the experimental conditions, and the data of a large number of orthogonal tests are analyzed. The order of the influence of each electric parameter on the test index is obtained. It provides a better basis for wire cutting of cemented carbide YG 6 material.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG484

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