Research On High-precision Grinding Of Involute Cam Of Grinder Y7125

Being basic transmission parts, high-precision master gears are widely used in national defense and equipment manufacturing fields, and their manufacturing accuracy is an important sign to evaluate gear manufacturing level of a country. As an important indicator of gear manufacturing, the tooth profile deviation directly impacts on gear drive noise, vibration and carrying capacity. So reducing the error can improve lots of the existing problems for gear transmission. Nowadays grinding process can improve gear's profile accuracy at the greatest extent. Gear grinder with involute cam-link stopper is usually used for grinding high-precision master gears for its higher rigidity of transmission chain and simple structure.The involute cam as an accessory of Y7125 is used for generating tooth form of an involute gear, and its profile error is one of the factors which decide the tooth form precision of gear. Therefore, improving the profile accuracy of involute cam can effectively increase the precision of gear. A grinding device with double-disc makes use of two base discs precision machinery to generate theoretical involute which is compared to the actual involute profile of cam to obtain profile deviation. For less error sources and errors homogenization between its double base discs, the device has the potential of accomplishing a high precise grinding of involute cams.Firstly, precise generating machinery of the device was studied in this paper. A involute cam component was designed, and it consisted of the involute cam section, the mandrel and two base discs. Manufacturing compensation method was used to align the component, and generating involute error caused by component's eccentricity was reduced to the minimum.Subsequently, measurement and adjustment methods of key components were systematically researched, which mainly included grinding wheel spindle axis, coupling eccentricity, gantry frame, driving plate, wheel dresser and static balance of cam component.Vibration experimental platform was built by means of dynamic signal analyzer and sensor to test and diagnosticate the device. By collecting and analyzing the vibration signal, vibration source was established. Finally reducing vibration measures were found.The main sources of grinding profile errors were analyzed, including comprehensive deviation of base discs, eccentricity of component and the position deviation of grinding tangent line. According to the analysis, error mathematical models were established, and evaluation of grinding error was realized through the models, which laid a theoretical foundation for the adjustment of device. Finally, grinding experiments were carried out on the double-disc involute grinding device. The experimental data shows that the device is able to accomplish high-precision grinding of involute cam.