Research on Mechanism and Experi-Ments of Wire Electrode Wear in Wedm
|School||Harbin Institute of Technology|
|Course||Mechanical Manufacturing and Automation|
|Keywords||WEDM Wire loss ANSYS The slope of the current rise Transient Response|
EDM wire cutting technology as an important branch of power processing technology of the fastest growing , most widely used , and plays an important role in many areas . The WEDM there wire loss not only affects the machining accuracy , and will occur due to excessive wear and tear of the wire , broken wire . Because of its special processing mechanism and the complexity of the processing mechanism , no more mature theory to explain this phenomenon . Therefore carry out the wire loss mechanism and experimental research will not only help to improve the EDM wire cutting mechanism , and also has important practical significance to improve the machining accuracy and processing efficiency for guidance in the actual production . Access to large amounts of literature based on analysis of the microscopic mechanism of WEDM , the impact of mobile and wire electrode discharge channel loss factors . Consider thermal convection , the impact of the physical parameters vary with temperature and discharge channel mobile as process heat source with Gaussian heat source thermodynamic model , using ANSYS software peak current pulse width ratio and the current rise in the slope of the electrode wire loss temperature field simulation study . Power and current waveform controlled power switch tube wire loss experimental study , and plan a more reasonable processing path . Transient response analysis of the reasons for the current waveform controllable power increase inductance value of the current rise slope changes faint . Found that the main factors affecting the loss of the wire electrode is a current rising slope, followed by the ratio of the peak current and the pulse width and peak current through the wire electrode loss experiments . According to the above findings and experimental verification, in the case of a rising slope of a small current , low peak current and pulse width ratio and a small peak current , processing speed is reduced smaller cutting 105mm2 when the loss of the wire electrode of less than 5μm .