Virtual forming method of worm wheel

Abstract

The invention relates to a virtual forming method of a worm wheel, in particular to a virtual forming method of a worm wheel tooth groove in an annular-surface worm pair. According to a spiral-surface forming method of an annular-surface worm, a section line of a virtual worm wheel hob is obtained based on a meshing principle, three different points and three spiral lines that the three different points, serving as control points, move relative to a worm wheel along with the virtual worm wheel hub are obtained from a shaft section where the section line is located, the shape of the section line keeps unchanged, the three control points move according to the three corresponding spiral lines, and a track curved surface of the section line is obtained. The above process is repeated on other section lines of the virtual worm wheel hub, a blank of the worm wheel is shorn through the track curved surfaces, a complete tooth groove of the worm wheel is obtained, the complete tooth groove forms a circumferential array on the worm wheel according to the tooth number, and then a three-dimensional digital model of the worm wheel is obtained. The density of the hob tooth section can be determined according to needs, and a high-accuracy worm wheel three-dimensional digital model is obtained.

Description

technical field [0001] The invention relates to a virtual forming method of a worm gear, in particular to a virtual forming method of a tooth groove of a worm gear in a toroidal worm pair, so as to meet the general numerical control machining requirements of the worm gear. Background technique [0002] Compared with the cylindrical worm drive, the toroidal worm drive has strong bearing capacity, small size, high transmission efficiency and long service life, and is widely used in transmission devices of mining and metallurgy, petrochemical, lifting and transportation, ships, power and light industrial machinery. However, the production of the hobbing worm gear hob for hobbing and cutting the worm gear is very complicated and difficult to manufacture. If the hobbing cutter is not used for hobbing and cutting the toroidal worm gear, but the general-purpose cutter is directly used for milling on a general-purpose CNC machine tool, the gear of the hobbing worm gear needs to be cu...

AI Technical Summary

Problems solved by technology

However, the production of the hobbing worm gear hob for hobbing and cutting the worm gear is very complicated and difficult to manufacture. If the hobbing cutter is not used for hobbing and cutting the toroidal worm gear, but the general-purpose cutter is directly used for milling on a general-purpose CNC machine tool, the gear of the hobbing worm gear needs to be cut. 3D digital model of the groove

There are two ways to obtain this three-dimensional digital model. One method is to obtain the discrete points on the tooth surface of the worm gear through the complex calculation of the meshing theory, and then obtain the tooth surface of the worm gear through fitting. Among them, the tooth surface of the worm gear is very complicated and often It is composed of the front transition surface, the rear transition surface, the original contact area and the new contact area tangent or superposition, and changes with the design parameters and modification amount; the second method is to use the worm entity or a certain axis of the worm Section, to simulate the relative motion of the worm and the worm gear, and use the Boolean subtraction operation to obtain the three-dimensional digital model of the worm gear. Because the amount of calculation data is very large, the rotation angle taken when simulating the relative motion of the worm and the worm gear is relatively large, and the precision of the obtained worm gear tooth surface is very low

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