Accurate forming method of special-shape deep-hole type parts

Abstract

The invention provides a precision forming method of special-shaped parts with deep holes, which relates to the metal machining field with almost no cutting, especially a precision cold forging forming technology of special-shaped parts with deep holes. The invention comprises the process of saw-setting, annealing, shot blasting and phosphorus-saponification of part blank, and back extrusion with tremendous deformation of the part blank; thus, the preformed body with deep holes is completed; then the process of low temperature annealing, shot blasting, phosphorus-saponification is repeated; and subsequently by a plurality of cold finishing, the final product which meets the requirements of structure property and dimension precision is obtained. The method has the beneficial effect that by back extrusion, the preformed body is once completed. The metal streamlines inside the product are continuously distributed according to the shape, and the product has compact microstructure and stable quality, thereby prolonging the service life of the product.

Description

Technical field [0001] The invention relates to the field of metal machining without cutting, in particular to a precision cold forging forming technology for special-shaped deep-hole parts. Background technique [0002] Among the cup-shaped parts, there is a type of parts that are deep-hole parts, and the ratio of their hole depth to the minimum inner diameter is greater than 3.5. If the inner hole is a complex special-shaped shape, it is called special-shaped deep-hole parts. Due to the deep inner hole and complex shape of such parts, they cannot be processed by ordinary hot forging methods. At present, there are two methods of producing this kind of products: one is casting first and then machining. The disadvantage of this production method is that casting pollution is large and machining is difficult; the other is powder metallurgy forming. This processing method has the advantages of easy processing, mold The advantages of long life and stable process, the disadvantag...

AI Technical Summary

Problems solved by technology

Due to the deep inner hole and complex shape of this kind of parts, it cannot be processed by ordinary hot forging method

At present, there are two methods of producing this kind of products: one is casting first and then machining. The disadvantage of this production method is that casting pollution is large and machining is difficult; the other is powder metallurgy forming. This processing method has the advantages of easy processing, mold The advantages of long life and stable process, the disadvantage is that it cannot meet the strength requirements of the product, and the service life of the product is short

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