Research On Micro-EDM Milling Interpolation And Path Plan Technology

There are more and more Mico-constructs in industry equipment. It demands more machining methods. Mico-EDM milling has great advantage and potential ability to machine Mico-constructs. Micro-EDM milling is a kind of manufacturing method of non-contact between tool and workpiece. It can machine many kinds of material and no cut force. But some weak points such as discharge energy, discharge distance and unstable discharge state make it hard to control the machining process and to get effective method. It is also difficult to meet the accuracy for the electrode corrosion. The electrode compensation is important to the accuracy. Therefore, it is necessary to solve short circuit and make accurate compensation and path plan.This paper present a new interpolation method based on square constraint which can preclude short circuit in Mcro-EDM milling. There is also a new storage structure for the NC code. Based on the new interpolation method, this paper researched the feed method and present available period feed method. Meanwhile, a lot of machining experiments have been done to find the optimal electrical parameter. In the machining experiments, the new interpolation method combined with the new feed method can solve the short circuit problem and enhance the efficiency largely. The optimal electrical parameter can enhance the efficiency more. Based on the compensation parameter, this paper researched the3D’ path plan and designs3D path with automatic compensation. Based on the researches above, this paper developed a numerical control software for Mico-EDM milling machine. The software contains control method, machining state display, compensation method, manual control and parameter adjustment. It can control movement of motors and platform to meet the accuracy through PMAC.In the experiments, the software can connect well with hardware and the accuracy can meet the design requirement. As no short circuit in the machining process, the machining efficiency was improved by30%. Also, using this system, the micro-3D structure can be machined in one time with automatic compensation.