【作者】 张新服；

【导师】 王彤；

【作者基本信息】 哈尔滨理工大学 ， 机械制造及其自动化， 2005， 硕士

【摘要】 电火花线切割加工技术在众多的工业生产领域起到了重要的作用。当前,电火花线切割加工技术的发展趋势为:精密微细化、智能化、个性化、绿色环保化和高效化。气中电火花线切割加工技术是近几年出现的一种新技术,它采用气体作为介质。与传统线切割加工相比,气中线切割加工技术具有加工表面直线度良好、放电间隙小、加工表面无电解腐蚀、无污染等特点,适用于电火花线切割精加工。本文概述了传统电火花线切割加工机理和工艺规律;并从理论上解释了气中线切割加工具有良好直线度的原因。本文还对实验仪器DK7632 低速走丝电火花线切割机床及2302 型表面轮廓测量仪进行了简要介绍。在大气和去离子水两种介质条件下采用相同的加工参数,对模具钢Cr12MoV 进行线切割精加工比较实验,并得出如下结论: 1.在其它加工条件相同情况下,气中加工的直线度都明显优于水中加工;气中加工的放电间隙都比水中的窄;气中加工的表面粗糙度值与水中加工相近。2.在其它加工条件相同情况下,气中加工的加工速度都比水中加工低,而适当选用较高的走丝速度有利于提高气中加工速度。3.在两种加工介质中,随着伺服进给速度的减小,以正常加工为前提的伺服电压可调范围(简称伺服基准电压可用范围)都变窄;而且气中的伺服基准电压可调范围比液中宽。4.与水中加工相比,伺服电压的变化对气中加工的评价指标的影响均较小。更多还原

【Abstract】 Wire Electrical Discharge Machining (WEDM) has important effect in a lot of industry stages. Nowadays the developing trends of WEDM are precise-microlization, intellectualization, individualization, environmental protection and high efficiency. WEDM in gas is a kind of newly developed technology, in which gas has been used as a dielectric. Comparing with the conventional WEDM, the new method has the features of better WEDMed surface straightness, smaller gap length, no electrochemical corrosion and no pollution in machining, so it is suitable for WEDM finishing. This paper summarized the mechanism and processing rules of WEDM, and theoretically explained the reasons for better WEDMed surface straightness with gas dielectric. Besides, the Low-Speed WEDM machine DK7632 and the 2302 surface surveying instrument were briefly introduced. The comparison experiments of finishing WEDM were conducted with mould steel Cr12MoV in water and atmosphere under the same machining parameters, and the following conclusions were obtained: 1. Under the same conditions (except the dielectric), the straightness of surfaces WEDMed in atmosphere is significantly better than that in water, and the discharge gap in atmosphere is smaller than that in water, and the surface roughness in atmosphere is nearly the same with that in water. 2. Under the same conditions (except the dielectric), the removal rate in atmosphere is lower than that in water. And the removal rate can be increased when higher winding speed is utilized. 3. With the decreasing of servo feed, the available value limits of servo voltage became smaller for both dielectrics, and the value limits in atmosphere is larger than that in water. 4. Comparing with traditional WEDM, the changing of servo voltage had less influence on evaluate parameters for WEDM in atmosphere.更多还原