| As an important component in construction machinery,gears have excellent performances such as high transmission efficiency,strong carrying capacity,long life,stable and reliable operation,and have been widely used in the manufacture of products in various industries such as aerospace,energy,automobiles,and ships.In order to meet the trend of high-efficiency,high-precision,low-cost and customized development of gear processing,and to solve the deficiencies of traditional gear processing methods in the production of gear processing accuracy,efficiency,flexibility and small-volume large-modulus gears,it is increasingly obvious The problem.A kind of enveloping milling method for flexible machining gears based on space free curved envelope theory and tooth surface accuracy characteristics using universal disc milling cutter and universal machining center is proposed.According to the tooth profile theory and the development process,the differential geometric characteristics of the tooth profile surface and the tooth surface precision characteristics are comprehensively considered to be allocated according to need in the process of tool path planning,and the constructed tool step in the direction of the tooth profile is used The calculation formula calculates the maximum distance of the tool step along the tooth profile direction,the step distance corresponding to each tool position when the general tool is cutting the tooth surface,and the involute angle of the tooth profile corresponding to each tool position,and then derives The calculation formula of both the involute angle of the involute profile and the residual height difference of the tooth profile of the flexible envelope milling tooth based on the accuracy characteristics of the tooth surface.This paper mainly studies the optimal matching relationship between the tool path and the accuracy characteristics of the tooth surface when the disk milling cutter is milled.The specific research contents are as follows:(1)Research the theory of flexible envelope milling based on universal disc milling cutters.Analyze the geometric principle of the flexible envelope milling of the disk milling cutter,and use the matrix transformation theory between the spatial coordinate systems to construct the transformation between the tool coordinate system of the universal disk milling cutter and the workpiece coordinate system of the involute cylindrical spur gear The relationship between the tooth surface coordinate equation and normal vector of the involute cylindrical spur gear and the universal disk milling cutter were established,and then the tool position of the flexible envelope milling process was solved.(2)Study the influence relationship between tool path and tooth surface accuracy characteristics.By introducing the characteristics of the common equal step control method,equal residual height difference control method and the contradiction between the accuracy and efficiency of gear processing,a flexible envelope of involute gears considering the differential geometric characteristics and precision characteristics of the tooth profile surface is proposed Milling infeed strategy;develop a simulation program through numerical simulation,study the relationship between the equal residual height difference control method and the tool path trajectory control method based on tooth surface accuracy characteristics and tooth surface error,and compare the same infeed times Under the conditions of the two feed methods,the tooth surface residuals are obtained;the influence of gear parameters(number of teeth,modulus,pressure angle)on the tooth surface error is analyzed.(3)Based on the characteristics of the tooth surface accuracy,the flexible envelope milling of involute cylindrical spur gears is simulated using a universal disc milling cutter.Relying on the auxiliary processing module of the simulation software for processing simulation,the tool is a universal disk milling cutter,and the processing object is an involute cylindrical spur gear.The simulation process mainly includes creating a three-dimensional digital model,setting the machining environment,perfecting the tool path file for machining according to the characteristics of the tooth surface,generating the tool path,performing post-processing and generating NC codes,and finally verifying the infeed by comparing the results of numerical simulation and simulated machining Feasibility of the way... |
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