Gear micro-texture flow control cold extrusion forming die and preparation method thereof

Abstract

The invention provides a gear micro-texture flow control cold extrusion forming die and a preparation method thereof. A pit micro-texture, a groove micro-texture or a triangular micro-texture is prepared at the tooth back of a tooth-shaped female die of a gear cold extrusion forming die, when microtexture is groove microtexture, an included angle a is formed between the edge, in the length direction, of the groove microtexture and the lower end face of the gear cold extrusion forming die, and when the microtexture is triangular microtexture, an included angle a is formed between the bevel edge of the triangular microtexture and the lower end face of the gear cold extrusion forming die. According to the gear micro-texture flow control cold extrusion forming die and the preparation method thereof, the area forming force and the metal flowing speed are actively controlled through the microtexture, and the problem that in the gear cold extrusion forming process, the gear forming quality is poor due to the fact that the tooth-shaped area forming force is larger, metal flowing is difficult, and tooth-shaped area filling is insufficient is solved.

Description

technical field [0001] The invention belongs to the field of gear precision forming, and in particular relates to a gear micro-texture control flow cold extrusion forming die and a preparation method thereof, which can realize flow control forming of a blank in a gear tooth shape area. Background technique [0002] Cold extrusion is an important production process for manufacturing gears. It has the unique advantages of high quality, high efficiency and low cost, and is being highly valued by the equipment manufacturing industry. Spur gear cold extrusion generally adopts the forward extrusion method, put the softened and annealed cylindrical billet into the concave mold cavity, and use the flat-bottomed punch to squeeze the billet downward, and the metal material flows downward under the action of extrusion force , Gradually fill the cavity of the concave mold to form a spur gear. During the cold extrusion forming process of the gear, due to the relatively closed tooth-shap...

AI Technical Summary

Problems solved by technology

[0007] The invention adopts a laser processing system to prepare pit micro-texture, groove micro-texture or triangular micro-texture at the tooth back of the tooth-shaped die of the gear cold extrusion forming mold, and actively controls the regional forming force and the triangular micro-texture through the micro-texture The metal flow speed solves the problem of poor gear forming quality due to the large forming force in the tooth profile area, difficulty in metal flow, and insufficient filling of the tooth profile area during the cold extrusion forming process of the gear.

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