A preparation method of eccentric cylinder forging with abrupt cross-section

Abstract

The invention discloses a preparation method of a section mutation eccentric cylinder forging. The preparation method comprises the following steps: the structure of a blank is determined according to a final forging of a section mutation eccentric cylinder, and need to satisfy the following two conditions: (1) the blank has a section mutation eccentric part, and the section mutation eccentric part of the blank need to totally cover a spherical cylinder forming cavity of a final forging mold, so that the spherical cylinder forming cavity satisfies reverse filling formation during final forging, and the folding generated in refluxing of forging materials is prevented through reverse filling formation; and (2) the contacted point of the section mutation eccentric part of the blank with a lower mold of the final forging mold is A; the contacted point of the main body part of the blank with the lower mold of the final forging mold is B; the highest point of the spherical column forming cavity of the lower mold of the final forging mold is C; the lowest point of a forming cavity of the main body part of the lower mold of the final forging mold is D; the height difference between the point A and the point B is a; the height difference between the point C and the point D is d; the height difference a is equal to the height difference b; the positioning is performed through the height difference; the blank is machined; and the final forging is prepared.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a method for preparing an eccentric cylinder forging with abrupt cross-section. Background technique [0002] For cylindrical forgings with general structure, at present, the round bar covering forging forming method or the upsetting preform forming method are mostly used. For eccentric cylindrical forgings with sudden cross-section, if the traditional round bar covered forging method or upsetting preform forming method is still used, folding defects will occur in the forging at the sudden cross-section, and the upsetting preform will form The method can also result in oversized burrs in forgings, as well as tearing or delamination defects at the burrs. Therefore, the pass rate of products for eccentric cylinder forgings with sudden cross-section has not been high at present. [0003] Such as figure 1 , 2 As shown, it is a final forging of an eccentric cylindrical...

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a method for preparing an eccentric cylindrical forging with a sudden cross-section, which can effectively avoid folding defects of the forging at the sudden cross-section, and can effectively avoid excessive burrs of the forging and tearing at the burrs. Crack or delamination defects, effectively improving the product qualification rate of eccentric cylindrical forgings with abrupt cross-section

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