Development Of Inverted Duplex Station Equipment For The Wire Electrical Discharge Machining Of Connecting Rod Fracture Splitting Groove

Since the 90s of last century,the automobile industry has been developing rapidly and the fracture splitting technology of connecting rod has been born.The technology has the characteristics of simple process,time saving and material saving.Prepating the fracture splitting groove is a key process in the technology.For this reason,the research group of Guangdong University of Technology creatively invented wire cutting equipment for processing cracked connecting rod stress slots.In this paper a new method of“inverted double-station wire cutting for connecting rod grooving processing”was innovatively proposed,and a new wire cutting processing equipment was developed based on this method.In this paper the basic structure of machine tool equipment was designed,including the wire framework,the platform for fixture mounting,the fixture,the lifting mechanism,the mechanism of alignment movement and the mechanism of processing movement.The double station was designed to increase machining efficiency.The innovative design of the wire frame system structure solves the problems of the previous equipment in which the precision transmission parts were easily corroded by the working fluid and the wire cutting guide wheel was easily hit by the workpiece.Starting from the overall design logic of the control cabinet,the required electrical components were determined according to the flow chart of the motion control;the type of the PLC logic controller,core of the control cabinet,were selected;Specific types of stepping motors,stepper drives and Variable-frequency Drive were determined according to the motion requirements of each movement mechanism;according to the functional requirements of the inputs and outputs,the I/O signal port assignments of the PLC were arranged;a ladder logic control program was written and the man-machine operation interface was designed based on the movement requirements during the processing,which could make operator to grasp the details of each motion module of the machine tool better.After confirming the basic conditions of the experiment,an experimental scheme was formulated.By analyzing the results of the L₁₆?4⁵?orthogonal experiment,the processing parameters of the machine tool were optimized preliminarily,and the machine tool was fully verified to be reliable and stable due to its normal and stable operating status during multiple experiments.Combined with the actual operation of the machine tool,a comprehensive analysis of the overall structural design was conducted,and the points were found to further optimize the structure were found,and specific optimization schemes were proposed.