Two-way synchronous wire EDM machine for stress groove of connecting rod

SU Guo-kang1,2, LI Yi-feng1,2, LI Jun-fei1,2, FENG Shang-xin3, ZHANG Yong-jun1,2
(1.School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;
2.Guangzhou Key Laboratory of Non-Traditional Manufacturing Technology and Equipment, Guangzhou 510006,
China; 3.Daitie CNC Machinery Co., Ltd., Foshan 528825, China)

Abstract: Aiming at the processing efficiency of connecting rod stress groove, equipment manufacturing cost, consistency of stress groove on both sides, constant depth of stress groove, based on the singlerod grooving machine, a twoway synchronous wire electrical discharge machining equipment for stress groove was proposed. The mechanical structure of support platform, grooving platform, alignment platform and adapter platform were designed. A special pulse power supply based on STM32F103 singlechip microcomputer and a control system based on Mitsubishi PLC were developed. The processing mode of twoway synchronous grooving was adopted to study the influence of various factors on the width of the groove. Furthermore, the optimized parameters were used to compare the machining efficiency between the prototype and the singlerod grooving machine. The results indicate that the current factor has the greatest influence on the groove width. The prototype can achieve higher efficiency by twoway synchronous grooving stress groove, and ensure good grooving quality and low equipment manufacturing cost.
Key words: fracture splitting machining; wire electrical discharge machining(WEDM); connecting rod stress groove; machine tool