During the cold extrusion forming of the inner ring gear tooth shape, the billet metal expands outward. When the upper punch leaves the blank, the metal is reset to the original position. This is the rebound of the metal, which is reflected in the cold extrusion. The size of the tooth tip circle and the root circle of the ring gear is smaller than the size of the punch on the die, so the tooth shape and size are increased, so that the wire cutting according to the size of the standard tooth shape cannot meet the requirement, and must be The tooth profile and size are corrected. The amount of shrinkage is related to the mechanical properties of the material, the size of the cold extrusion, the size of the extrusion force, etc., and can be calculated according to the elastoplastic theory. Since the assumptions of the calculation formula differ greatly from the actual one, the correction value The actual distance is large, and it is generally determined based on experience and corrected. The latter is determined by the die size of the inner ring gear.
The inner ring core structure has a blind spot in the processing of small modulus gears in China. Therefore, the shape of the tooth profile curve of the ring gear is designed by computer aided design. Then, according to the size of the inner ring gear teeth, the tooth profile curve on a single circumference is drawn. Finally, the coordinates of the feature points on the curve and the curvature radius and center coordinate value of the relevant arc are used to form the tooth profile of the inner ring gear. Line cutting program for punching blocks. Through computer-aided design, we have solved the problem of processing the main part and the upper punch in the core structure. Using computer-aided design, after designing the size of the tooth profile, the coordinates of the feature points on the tooth profile curve of a single segment and the radius of curvature and center coordinate of the associated arc.
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