气中电火花线切割精加工Cr12MoV实验研究  

Experimental Research on WEDM Finishing of Cr12MoV in Gas

作　　者：王彤[1] 高金鹏[1] 王孙菲 许小村[1] 

机构地区：[1]哈尔滨理工大学机械动力学院,黑龙江哈尔滨150080

出　　处：《硬质合金》2016年第6期398-403,共6页Cemented Carbides

基　　金：国家自然科学基金项目"电火花线切割加工的广义干式介质和可控介质研究"(50975069)

摘　　要：本文采用单向走丝线切割机,针对Cr12MoV模具钢,设计一种新的多次切割实验,前三次切割在去离子水中,第四次切割在大气和去离子水中进行。对比实验结果表明,气中精加工的表面粗糙度优于去离子水中,去离子水中加工表面有许多腐蚀形成的微孔,同时去离子水中的切割速度较高。第四次切割采用大气介质更容易获得较好的表面质量。为研究主要加工参数(脉冲宽度、脉冲间隔、峰值电流、伺服电压、主电源电压、伺服速度、电极丝的速度、偏移量)对工件表面粗糙度和加工切割速度的影响,进行了大气中的第四次切割实验。单因素实验结果表明,与去离子水中的精加工相比,大气中精加工时各加工参数对工艺指标的影响规律曲线有不同之处。本文对气中精加工实验结果进行了分析,并在实验取值范围内,通过比较获得了表面粗糙度和切割速度俱佳的几个主要参数取值。A new multiple cut test of mould steel Cr12MoV with low-speed WEDM was designed. The first cut, the second cut and the third cut were carried out in deionized water, and the fourth cut was carried out in atmosphere and deionized water, respectively. The results show that the surface roughness of Cr12MoV finished in atmosphere is better than that finished in deionized water. Many micro corrosion holes appear on the surface of Cr12MoV finished in water, meanwhile the cutting speed in deionized water is higher. So the fourth cut in atmosphere is feasible to have better surface quality. The fourth cut was especially carried out in atmosphere to investigate the effects of main process parameters including pulse duration, pulse interval, peak current, servo voltage, main power supply voltage, servo speed, wire speed and offset on the surface roughness and the cutting speed. The result of the single factor experiment shows that there are some differences between the influence curves obtained in atmosphere with those obtained in deionized water. The result of finishing in atmosphere is analyzed, and some optimal parameters for the best surface roughness and cutting speed are selected in the test ranges.

关 键 词：电火花线切割 气中精加工 切割速度 表面粗糙度 

分 类 号：TG484[金属学及工艺—焊接]