Improving the Finishing Efficiency of Coarse-Grained Gear Wheels
Purpose of research. Improving the finishing performance of coarse-grained gear wheels on software-controlled machines. Methods. The method of discrete copying, the theory of designing cutting tools, methods of mathematical and computer programming. Results. It is an urgent task to improve the performance of fine milling of coarse-grained gear wheels by using the capabilities of modern software-controlled equipment. Here we consider the issues of improving the finishing performance of coarse-grained gear wheels on software-controlled machines of hyperboloid mills equipped with interchangeable polyhedral plates (IPP) with a straight cutting edge located at an angle λ to the instrument axis of rotation. It is proposed a method for controlling the accuracy of shaping surfaces, generatrix of which forms a section (set of sections) of convex curves by installing a cutting tool relative to the evolvent profile (fourth axis of the machine) and relative to the feed direction (fifth axis of the machine). The authors have developed a discrete copying method with a set of hyperboloid cutters of tooth surface of coarse-grained gear wheels. It allows us to ensure the 6th degree of accuracy in the parameter of the tooth profile error. Conclusion. The results of the study improve the finishing performance treatment of the teeth of coarse-grained gear wheels on software-controlled machines by reducing the number of passes required for machining one side of the tooth in comparison with the methods of continuous rolling and high-speed end milling. The proposed designs of cutting tools have sufficient versatility to handle a wide range of coarse-grained gear wheels, which is important in the repair and small-scale production.