Research On Processing Technology Of Large Chain Wheel Based On Wire Cutting

With the constant development of science and technology and the actual production required,big chain wheel are being put into a higher level: small quantities and many species develop in the direction of the flexible manufacturing,more and more high-precision manufacturing,low-cost,short cycle. strengthening the study on the new efficient large-diameter sprocket tooth trench processing system has been a priority of the agenda.At present, there are many processing methods,but there are a variety of disadvantage: low efficiency,large consumption of labor,high cost and so on.Such as traditional processing methods,usually the processing of double-arc tooth sprocket,use the shape tool (milling cutter or hob),if a small number and variety of different specifications,then the Factory at the general create the appropriate tools,according to information,24A tool takes more than 6000 RMB,32A should be more than 7000 RMB,but the more non-standard processing,the higher cost,so the large sprocket new processing system has been given top priority.After comparison of several processing methods,the paper chose to WEDM processing large sprocket groove.Even though EDM cutting technology has the advantages and can be used as a way of cutting large sprocket, but its slow and inefficient cutting have become a large exent shortcomings.At present,workpiece is placed along the X, Y coordinates of two-axis movement of table, driven by the table in accordance with the processing to exercise track interpolation. Wire electrode at a fixed wire shelves only does do closed loop mechanical exercise, dosen't do X, Y direction of movement, cutting at a certain range because of their mobile device limitations, the need for downtime for manual rotation of the workpiece for the next cutting , which is not continuous molding process.For the teeth of the cutting groove, this time not only to extend the cut, but each time the impact of artificial spin easy positioning accuracy and reduce processing efficiency.Therefore,we consider to improve the current HS-WEDM,while maintaining the accuracy of the original cutting,the use of many power, multi-electrode wire and rotating workpiece to improve the cutting efficiency and reduce labor consumption. Therefore, we proposed an electrode wire system installed in the X, Y coordinates table and the workpiece mounted on a rotation around its axis fixed table. This wire-electrode will cut for interpolation along the X, Y direction, the workpiece itself do X, Y direction of movement, only their own rotation.Whenever after processing a tooth, the workpiece rotation angle, so not only instead of artificial rotating the workpiece, but also to ensure that the positioning accuracy and improve processing efficiency. In order to rotate the workpiece in place, we have adopted as a sub-degree rotating disk carrying Units, through the motor to drive. The improvement of the most prominent characteristics is, no matter how big the workpiece can be processed for forming, at the same time by adjusting the distance between the electrode wire and workstations to processe with different diameters of the workpiece, the largest diameter of machinable sprocket greater than 10m.At present, cutting grooves in the teeth, the process at the time accounted for a significant portion of the assembly. However, the above method allows From the fixture to the molding process, the entire process is continuous, no artificial rotating workpiece. This make the whole process of assembly time greatly reduced, relative to a large extent to reduce the overall processing time, thereby significantly improve processing efficiency.At the same time, this article also theoretically proposed three ways to improve cutting speed: high pressure water jet method drives corrosion of metal particles, multi-electrode wiret, multi-processing power. According to the data, the former Soviet Union A207.26 and A207.60 can be used simultaneously for two electrode cutting wire. BL-based company Agie EDM machine tools for the modification, the electrode wire 10 can be processed. Many power processing, using a variety of power to process the same workpiece at the same time, because of the different discharge gap, the processing of different sizes (such as mold and the fixed die plate) that was many times the processing efficiency.Try from the "high efficiency", "automation" of the goal, this paper designed a new type of large-scale processing systems sprocket. This system not only to ensure machining accuracy and reduce labor consumption, but also improve the efficiency and speed of cutting to reduce processing costs, achieve a low-cost, high-precision machining of small equipment, large parts of the idea. In order to expand the application of WEDM,gradient device should be developed. It is part of the original director attached to the two UV-axis so that it will have Four control functions at the same time, three-dimensional processing can become more advanced as the control device.In this paper, through researching Large diameter Sprocket Tooth Trench Machining System,which enriches the theory of domestic wire cutting and has done ample preparations for new processing system. At the same time, improved equipment is applicable to laser, oxyacetylene, plasma cutting equipment. It enriches the theory of special processing and establishes a certain foundation to deepen the study of special processing HtheoryH.