Research On Processing Theory And Technology Of High-Precision Crown Involute Cam

The ultra-precision gear has important application value in aerospace, precision machinery, defense and other fields, and the tooth profile accuracy is an important evaluation index of ultra-precision involute gear. High profile deviation Involute master is the entities of involute, which can be used for verification measuring precision of three coordinates measuring machine or gear measuring instrument. Restricting the involute manufacturing precision is improved into the system precision grinding equipment exhibition and tooth profile processing technology. Involute cam baffle type gear grinding machine is generating the most sophisticated components in the system, crown involute cam can effectively eliminate the phenomenon of the edge mesh, Improves the cam and the damper installation flexibility, increase the generative stiffness of gear grinding system, in order to improve the ultra-precision and master of high precision involute gear tooth profile processing precision. In this paper, based on the best molding principle of involute, fine-tuning design crown quantity of institution and the cone grinding wheel dressing, grinding high precision crown involute cam.First of all, studied the mechanical generative mechanism of double roller-double guide principle of high precision crown involute cam grinding, analyses the guide wave flatness and grinding contact position error effect on the processing and the accuracy of measurement. Grinding wheel diameter, the width of the cam was established, the angle of the grinding wheel to the cone angle and the spindle and drum parameters, such as quantity of mathematical model.The second, in view of the drum and grinding wheel head parameter mapping relationship, using the upper and lower wedge fine-tune principle, and the permitted scope of elastic coupling shaft angle of the crown quantity continuously fine-tuning mechanism innovation design. Through studying the characteristics of end face the inner cone grinding wheel dressing design corresponding grinding wheel dresser.Preliminary discussion on the drum quantity size and involute cam contour shape precision and allow the installation of the relationship between the deflection angles to optimization of crown quantity. Through the balance of precision assembly and adjustment of the involute cam component, precision grinding the surface of the guide rails, crown probe measurement position adjustment to the greatest degree of reduce error sources.Finally, optimize the grinding process, through to the involute cam grinding and testing. Data show that after fine grinding of the cam, there are4μm tooth to crown degree, shape of tooth profile deviation in the exhibition of long range is less than0.5μm; And applies after the elaboration of crown involute cam Y7125precision grinding machine, precision master of grinding involute, master of tooth profile shape deviation is less than1.2μm.