Hnatiuk A. Improvement of the finishing process of the lantern wheel profile of gerotor pair

The work is concerned with the improvement of the quality parameters of the profile surface of the lantern wheel of the gerotor pair due to the application of the concave area of the equidistant to the epicycloid as a forming profile of the circular abrasive tool, that working in the conditions of generating process. On the basis of the analysis of the known processing methods, a progressive scheme of processing was selected that involves the creation of a machine gearing in which the lantern wheel makes a planetary motion around a disk grinding wheel. As a tool profile, the convex part of the equidistant to the epicycloid is used (Convex PEE). Expediency of using the concave area as a forming profile of the grinding wheel has been justified. It has been theoretically proven that the use of the Concave PEE allows the roughness to be minimized and, accordingly to improve the basic grinding method. The simulation results show, that the use of Concave PEE allows for a mikro-roughness of 2.5-2.8 times less than Convex PEE, with the same design discrete step. The conditions for the existence of curves in the gearing are determined, namely, the existence of the violations of equidistant curve, which manifest themselves in the form of «degeneratedareas» and conditions for the existence of the peripheral of the equidistant group to the epicycloids in a single continuous form has also been performed. The methodology of synthesis of a grinding wheel profile on the basis of a concave part of the equidistant to the epicycloid was developed. Research results of the kinematics of the contact interaction between the tool and the profile surface of the wheel shows the variable velocity mode of the contact point of the profiles in the flat machine gearing. It has also been suggested to stabilize the process by linearizing the velocity of generating process which will allow achieving continuity of feed on the ossilation motion of the tool. In the process of practical realization of the grinding method of the lantern wheel, it was established that with commensurate fields of dispersion of the precision parameter, the use of Concave PEE provides 2.3-2.5 times better micro-roughness with the same processing conditions. Comparable precision dispersions is explained by the low stability of the profile on the basis of Convex PEE, which experimentally amounted 3 times less than for the Concave PEE. High stability of the profile on the basis of Concave PEE is allows be use a cheap abrasive tool on a ceramic bond. A number of innovative technical solutions for introduction of the machining technology of gerotor gears in the single and serial manufacturing are presented