Machining Technology Improvement And Cutters Design Of Back Taper On Internal Spline

At present, in the cycloid rotational indexing processing back taper technique, machining requirements were achieved mainly through the method of using cycloid cluster to approach the involute, In the technique, cycloids approach the involute section by section from the dedendum, other than from the view of the overall involute . So it generates too many cycloids to make its advantage of high efficiency.The existing machining back taper cutters installed in cycloid spinning machines make use of Triangular blades. The inclinations of cutting edges and the revolution radiuses of the cutter tips are fixed. So the cutter is Specific, which can only process a corresponding back taper. Moreover, the manufacturing process of the cutter is complex and it is expensive, which bring about the back taper processing costs are high that the requirement of the cutter on economy cannot be satisfied. Against the above issues, this paper completed these following work.First of all, the mathematical model about cycloid was introduced, moreover, the structure of a cycloid spinning machine and the realization of cycloid spinning processing methods were described, which provided a theoretical basis for the subsequent improvement of the back taper processing with cycloid rotational indexing machining technique and the design of general-purpose back taper cutters.Secondly, according to the cycloid forming principle, the scope of allowed approximation error was given. Through the analysis of effects what various cycloid parameters had on the cycloidal shape, the methods of calculating the ranges of the parameters belong to cycloids what approximating the internal spline involute were determined, and then the method of calculating the best approximating cycloids was worked out to obtain the approximating cycloids of involute. The number of cycloids close to the internal spline involute was reduced. The improvement of the back taper processing with cycloid rotational indexing machining technique was completed.Thirdly, three structures of general-purpose cutters used to process back taper were presented. Through analysis and comparison, the most simple, economical, safe and stable solution was find, According to which, the method of determining the structural parameters of the cutter was described, and the cutter collision detection method was given.Finally, the simulative processing is carried out. The result demonstrates that the number of cycloids is one third of the previous and the machining time saves about 64%. This indicates that the improved method is feasible to machine back taper. According to the case, the parameters of the cutter was determined and the Interference test was carried out. The result was that there was non-interference between the cutter and the tooth profile of internal spline.