Research On Wire Cutting Processing System Of Large Diameter Sprockets

As a common mechanical transmission，chain transmission is being used widely，and it has irreplaceable position in a number of areas. In our country，the production anduse of chain transmission products are increasing year by year，and the requirement typesof chain transmission products are becoming more and more rich. Due to the largerdiameter sprockets’ special transmission performance, now they are used in mining,power, ports and other heavy industrial fields. Along with the progress of science andtechnology and the demand of practical engineering, the people have higher requirementsfor the processing of the larger diameter sprockets. Through the study of several commonsprocket processing, find that these processing methods have some weaknesses, such ashigh processing cost, large labor consumption, and low processing efficiency. And someprocessing equipments cannot process the large diameter sprocket.Through the comparison of several processing technologies, this paper adopts wirecutting to process the larger diameter sprockets. Although wire cutting machine tool cancut the larger diameter sprockets, there are some weaknesses, such as high processingcost, low processing efficiency. Aiming at these weaknesses, this paper proposes animproved scheme. That is the walking wire agency and wire frame part of the originalmachine tool are fixed on the X、Y active platforms. The electrode wire does theclosed-loop motion, at the same time it does the interpolation motion along with the X、Yactive platforms. In addition, design a rotary worktable, and fix it on a guide rail. Thework piece is clamped on the rotary worktable, and determine the diameter of work pieceby moving the rotary worktable on the guide rail. Stepper motors supply power for themachine tool, and are closed-loop controlled by photoelectric encoders. When cutting therotary worktable keep fixed, the electrode wire makes the cutting path in accordance withthe procedures set. When cut a tooth, the rotary worktable drives the work piece to rotatea certain angle, and then the electrode wire returns along the original path, cutting thenext tooth. In the whole cutting process, the work piece is clamped and located once atthe beginning of cutting, and then it is cut continuously. So this can use small equipmentand low cost to manufacture large diameter and high precision sprockets. The improvedcutting system guaranteeing the premise of processing precision, has the advantages oflower cost, less consumption and higher processing efficiency, and has greatdevelopment value and broad market space. This paper built an experimental platform and did the drawing test, which verifiedthe feasibility of the design scheme. In addition to aiming at the weakness of beingunable to cut taper and pitch surface, this paper presents two improved schemes. One isfix a guiding device under the worktable to control the position of the electrode wire, andthe other is the worktable rotates a certain angle through a worm couple. The researchresults of this paper can also be used in laser cutting, plasma cutting and other fields,enrich the theory of special processing.