The Research And Development Of The Wire-feeding System For The WEDM-LS

This article mainly about the research on the development of the WEDM-LS, to WEDM-LS, the wire feed system is very important. Every part of the wire feed system has reflected the level and quality of the machine tool. The speed of the wire and the tension influence the surface quality of processing work piece directly. With the developing of micro and high precise manufacture, more requests on the stability of the wire-feeding system are called on, therefore, it has realistic meanings to research on the wire-feeding system.The new developments of WEDM-LS and wire-feeding system for WEDM-LS are stated firstly in this paper on basis of a lot of domestic and overseas technique literature on WEDM-LS. After analyzed and researching on the working theory of wire-feeding device,a method to control open loop tension using magnetic powder brake and wire feeding speed adopting step motor are putted forward; A wire-feeding system is researched with PC as main controlling unit, the kinetic control card of PCI bus and D/A output card of ISA bus as converting I/O,the magnetic powder brake as performing device and the step motor as the wire feeding motor; The working theory of main part of the wire-feeding system are analyzed. A math model of wire-feeding system is set up and a system transforming function is presented.The mechanic part of wire-feeding system is developed. On the research of key parts, the device to automatically adjust pressure between the tension pulley and the tension pressing pulley, and the device to adjust the pressure between the recovery pulley and the Pressing pulley are designed.The content voltage circuit and circuit to drive magnetic powder brake are designed and debugged, a real-time control software based on VB6.0 has been written, the wire-feeding system is controlled automatically have realized.After confirming the inside and outside parameters of the wire-feeding system, the general debugging is carried. Through testing, the wire-feeding controlling system can carry on real-time control and control method is confirmed.