摘要
分别采用SiC混粉介质和常规介质对Cr12MoV模具钢进行电火花线切割多次切割加工对比试验。在相同加工条件下,采用混粉介质相较于常规介质火花放电加工,首次切割(粗加工)时,切割速度提高22.16%,工件表面粗糙度降低15.05%,电极丝损耗降低21.87%;第二次切割(半精加工)时,工件表面粗糙度降低10.05%,直线度误差降低15%;第三次切割(精加工)时,工件表面粗糙度降低27.12%,直线度误差降低50%。研究发现,极间SiC纳米微粒的串联放电,增大了放电间隙,改善了极间排屑条件,大大提高了线切割速度和表面加工质量。极间电火花放电通道的快速扩展,减弱了电极表面单位面积上的放电冲击力,大大提高了电极表面加工质量,降低了电极丝损耗。
Both SiC powder mixed medium and conventional medium were adopted to multiple cutting of reciprocating WEDM test of Cr12MoV die steel and the machining effects were compared.Under the same machining conditions,the cutting speed of the workpiece was increased by 22.16%,the surface roughness of workpiece was reduced by 15.05%and the loss of the wire electrode was reduced by 21.87%in the first cutting(rough machining)by using powder mixed medium compared to convertional medium.In the second cutting(semi finishing),the surface roughness of the workpiece was reduced by 10.05%,and the straightness error was reduced by 15%by using pouder mixed medium.In the third cutting(finishing),the surface roughness of the wokpiece was reduced by 27.12%,and the straightness error was reduced by 50%by using powder mixed medium.The series discharge of SiC nano-particles between electrodes could enlarge the discharge gap,improving the chip removal conditions between electrodes and greatly improving the wire cutting speed and the processing quality.At the same time,the rapid expansion of spark discharge channel between electrodes could attenuate the discharge impact force per unit area on the electrode surface,increase the processing quality of the electrode surface and reduce the loss of the wire electrode.
作者
马秀丽
滕凯
MA Xiuli;TENG Kai(Department of Numerical Control Technology,Xuzhou Mechanical and Electrical Technician College,Xuzhou 221131,China;School of Mechanical and Electrical Engineering,Xuzhou Institute of Technology,Xuzhou 221018,China)
出处
《现代制造工程》
CSCD
北大核心
2023年第8期75-79,共5页
Modern Manufacturing Engineering
基金
江苏省高等学校自然科学研究重大项目(19KJA560007)。
