Five-axis side milling method for planar double-enveloping worm

Abstract

The invention relates to a five-axis side milling method for a planar double-enveloping worm, which includes the processing steps of selecting a side milling cutter, determining side milling process parameters, roughing the bottom surface of a worm tooth root by means of five-axis linkage, roughing tooth surfaces on two sides of the worm by means of side milling, performing quenching heat treatment, finishing the bottom surface of the tooth root by means of five-axis linkage and finishing the tooth surfaces on the two sides of the worm by means of five-axis linkage side milling. The five-axis side milling method is characterized in that a side milling tool path is completely generated according to a tooth surface meshing contact line of the worm, a roughing side milling tool path is generated by offsetting the contact line along the normal direction of the tooth surfaces by the distance of roughing allowance, and a finishing side milling tool path is generated by completely overlapping a tool side blade with the tooth surface contact line. The five-axis side milling method effectively solves the problem of uneven roughing allowance of the planar double-enveloping worm, and finishing efficiency and tooth surface processing accuracy are improved.

Description

technical field [0001] The invention relates to the field of milling processing of plane quadratic enveloping toroidal worms, in particular to a five-axis numerical control side milling processing method of plane quadratic enveloping toroidal worms, in particular to parts suitable for plane enveloping toroidal worms Five-axis precision CNC machining. Background technique [0002] With the plane as the parent surface, the plane-enveloping toroidal worm is formed through the space envelope motion, and then the worm tooth surface is used as the parent surface, and the worm gear can be formed after the second envelope. The worm and worm gear formed by the two envelopes Matching, a plane secondary enveloping toroidal worm drive is formed. [0003] Compared with the cylindrical worm drive, the planar double-enveloping worm drive has the following advantages: the number of contact teeth is large during transmission, so that the load on each contact point is small; the lubrication ...

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Problems solved by technology

[0006] The turning of rough machining is to make the blade of the turning tool tangent to the base circle in a straight line, while the plane of the grinding wheel for finishing machining is a parent plane with an inclined angle and tangent to the base circle. The forming principles of the two are different. The former It belongs to the worm with constant tooth shape and equal tooth thickness, while the latter belongs to the worm with variable tooth shape and variable tooth thickness, so it causes the problem of uneven grinding allowance

[0007] Due to the discrepancy between the circular grinding wheel plane and the planar quadrilateral worm gear tooth surface during finishing, the grinding wheel plane can only cover a part of the theoretical worm gear tooth surface based on experience, resulting in errors in the machined worm tooth surface, and in the grinding process The grinding head needs to be turned over when the tooth surfaces are on both sides, which reduces the processing efficiency

Moreover, because the profiling method is used for processing, special equipment such as special grinding heads for worms and helical cutting cutters for worms are required.

[0008] So far in China, the method to solve the problem of equalization of the allowance is mainly the enveloping method of the plane milling cutter (Zhou Liangyong. The principle and manufacturing technology of the toroidal worm. Changsha: National Defense University Press, 2005), that is, using a The same milling cutter is used to process the tooth surface of the worm. The tooth surface after rough machining is the closest to the tooth surface after grinding by this method, but it needs to make a special milling cutter and milling head, which requires high rigidity of the machine tool and increases process and cost

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