Research on power supply and control system of WEDM cutting of stress-notches in fracture splitting processing of connecting rod

摘要

Stress-notches cutting is one of the key processes in fracture splitting processing of connecting rod. This paper has put forward a new process of WEDM notches cutting with the advantages of free threading low cost, high efficiency and convenient maintenance. In order to obtain stable cutting quality and higher processing efficiency, studies are carried out on the machine tool power supply and control system. Higher-voltage circuit for the pulse power supply is designed in the form of switching power supply with dual-controller, which brings the advantages of higher degree of integration, less weight, smaller volume, and cost reduction. Moreover, the output voltage is continuously adjustable and has the function of voltage regulator, thus better processing quality can be achieved. The control system is designed to obtain constant depth of notches while cutting regardless of various sizes and tolerances of inner holes of the connecting rods, thus it can eliminate the negative influences on fracture splitting process caused by inconsistency of stress notches. Experimental results show that the presented WEDM power supply and control system can fully meet the requirements of notches cutting in fracture splitting processing of connecting rod.