精密圓柱蝸桿的CNC磨削工藝研究
[Abstract]:Cylindrical worm transmission is one of the forms of dynamic and motion transfer between spatial staggered shafts. It is widely used in various mechanical indexing mechanisms and mechanical transmission devices. Cylindrical worm is the core part of worm drive, which tends to be machined with hard tooth surface and precision, and grinding has become a common processing form of worm gear with hard tooth surface. Compared with milling method and turning method, the forming grinding method has the advantages of high machining precision and good surface quality, which has become the final tooth shape and surface machining form of precision cylindrical worm. In the forming grinding, the profile accuracy of the formed grinding wheel directly determines the final grinding quality of the worm, so this paper combines the numerical calculation with the grinding test for the forming grinding of the precision cylindrical worm. The grinding theory of several kinds of precision cylindrical worm and the CNC modification method of grinding wheel are studied. Finally, the NC program of CNC worm grinder is formed by parameterized program. According to the forming principle of straight busbar around fixed axis spiral, the mathematical models of three kinds of worm of ZN,ZA,ZI are established, and the equations of end face section and axial section of these three kinds of worm are deduced. The end equations of these three kinds of worm are uniform in form, but the values of the parameters (base circle or guide circle) are different. The grinding models of three kinds of precise cylindrical worm are established. According to the tangent condition between the rotary surface of the grinding wheel and the helical surface of the worm, the space meshing model of the cylindrical worm grinding is established, and the contact line equation between the cylindrical worm and the grinding wheel is derived. The cutting data of three kinds of grinding wheel for cylindrical worm grinding are obtained. By using numerical calculation method, the end surface profile of cylindrical worm represented by discrete points is smoothed, fitted and interpolated by local fairing method, cubic spline function and equal distance method, and the ideal fitting effect is obtained. Through the projection transformation of the contact line equation, the axial section profile to the grinding wheel is obtained, which provides the programming data for the CNC modification of the grinding wheel. The composition and working principle of CNC grinding wheel dresser are described. The suitable grinding wheel and diamond roller parameters and the reasonable technological parameters of grinding wheel dressing are selected. A method of grinding wheel modification is presented. The modification R parameter is set and the grinding wheel modification program is written. The worm grinding experiment was carried out on the CNC worm grinder SK7732A, and the worm after grinding was tested on the gear measuring instrument P65. The test results show that the worm tooth profile precision after grinding can reach 3 grades. The precision cylindrical worm has been achieved.
【學位授予單位】:陜西理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG580.6
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