Forming mold and forming method for ring gear

Abstract

The invention discloses a forming mold and forming method for a ring gear. The forming mold comprises an upper mold base and a lower mold base, wherein a convex mold base is arranged below the upper mold base; a punch mechanism is arranged below and connected with the convex mold base and comprises, from top to bottom, a punch seat, a punch and a guide head; the punch seat, the punch and the guidehead are detachably fixed on the convex mold base via fixed bolts; a detachable concave mold is arranged above the lower mold base; the internal diameter of the upper section of the concave mold is greater than the internal diameter of the lower section of the concave mold; guide pillars and guide sleeves are arranged at two sides of a part located between the upper mold base and the lower mold base; distance between the upper mold base and the lower mold base is adjusted through cooperation of the guide pillars and the guide sleeves; and a material returning mechanism is arranged between theupper mold base and the lower mold bas. The ring gear is molded by using a cold extruding process. The forming mold and the forming method provided by the invention have the advantages of low cost, good tooth form precision uniformity, long mold service life, high production efficiency and good mechanical properties of tooth parts and are applicable to preparation of ring gears with diameters of50 to 500 mm.

Description

technical field [0001] The invention relates to a processing molding die and a molding method, in particular to an inner ring gear molding die and a molding method. Background technique [0002] The existing processing methods of internal gears are mainly mechanical cutting. According to the traditional production process, it mainly includes: drilling, rough turning inner hole, fine turning inner hole, gear shaping, tooth pulling, etc. Among them, as far as the gear shaping is concerned, the processing time is long, and the material utilization rate is low, and the waste is serious. In addition, the traditional mechanical cutting process not only has many processing steps, long process route, low material utilization rate, high cost, low processing efficiency, but also poor consistency of gear accuracy, and due to the use of cutting processing, the mechanical properties are poor . In addition, for tooth broaching, the tool loss is large, the cost is high, and the accuracy ...

AI Technical Summary

Problems solved by technology

In the existing cold extrusion molding process of internal gears, since the tooth alignment accuracy of internal gears is affected by the movement deviation of the punch during extrusion, it is difficult to meet the precision requirements of conventional mechanical transmission; and the extrusion process is often limited to a specific size For internal gears, mold replacement is very frequent and production efficiency is relatively low; in addition, the current molds and methods for producing internal gears by cold extrusion molding are usually only suitable for the production of internal gears with small inner diameters, and their scope of application is narrow

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