REDUCTION OF ERRORS IN THE PROFILE OF THE TEETH OF GEARS IN THE PROCESSES OF GEAR MILLING WITH WORM CUTTERS

The article considers an approach to reducing the errors of the involute and longitudinal profiles of gears. The reduction of the profile error consists of several steps – evaluation of indicators relative to the limit values, identification of the technological structure, expert analysis of profilograms, which results in the content of corrective actions. Constant repetition of steps leads to a constant reduction of the most significant profile errors, which significantly reduces the risks of manufacturing wheels with inappropriate profile errors. The scheme is universal and can be used for any tooth processing operations. The article deals with the reduction of the error of profiles on the example of gear milling of cylindrical skew–toothed wheels with a worm gear cutter.

The Modification and Design Method of Large Gear

Due to the difficulty in large gear modification, a method that modifying gear tooth in the processing through correcting gear cutter was proposed. In this paper, modification theory of large gear and design method of gear cutter were introduced in detail. Based on gear meshing theory, the tooth equation of large gear was deduced from the equation of correcting cutter. The processing was simulated by using Matlab software, and it verified the validity of theoretical analysis.

The Influence of the Center-to-Center Distance on the Accuracy of the Serration with the New Gear Hob

A gear meshing mathematical model was set up according to the tooth profile normal line method. The influence of the gear cutter-workpiece center distance on the tooth profile accuracy was discussed in spur gear cutting using a new type of gear cutter, with the center distance errors being ±0.005, ±0.01, ±0.02 and ±0.04 respectively. The results show that the machined tooth profile errors at the root circle is less than 1μm, while errors at other parts of the tooth profile are even smaller.