An accurate mandrel reaming method for cylindrical forgings

Abstract

The invention discloses a cylindrical forge piece precise mandrel broaching method and belongs to the field of hot working of metal materials. The technical problem that a cylindrical forge piece cannot be accurately formed in the prior art is solved. The method comprises the steps that broaching rings are machined and manufactured on the basis that the outer diameter of each broaching ring is equal to the sum of the mandrel diameter and two times of the final wall thickness of the cylindrical forge piece; a combined mandrel composed of a mandrel, two semi-ring assemblies, two bushing rings, two broaching ring fastening double-screw bolt sets, N adjusting backing rings and two broaching rings are assembled, and the number of the adjusting backing rings is increased or decreased to enable the distance between the two broaching rings is equal to the final height of the cylindrical forge piece; the combined mandrel is inserted into an initial blank of the cylindrical forge piece and achieves centering, and the combined mandrel is placed on a mandrel supporter; a pressing machine with an upper anvil is pressed down, and mandrel broaching is started; the upper anvil is pressed down to the outer side faces of the broaching rings, and broaching is finished. The cylindrical forge piece precise mandrel broaching method is used for cylindrical forge piece broaching, and has the advantages that deformation is uniform and accurate, the force piece core portion is good in tightness, production efficiency is high, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of thermal processing of metal materials, and in particular relates to a precise mandrel reaming method for a cylindrical forging. Background technique [0002] In the technical field of thermal processing of metal materials, the mandrel reaming process is commonly used for forging cylindrical forgings. In the traditional mandrel reaming process, with the thinning of the wall thickness of the cylindrical forging, the inner and outer diameters expand at the same time, and the height increases. It is related to various factors such as friction conditions, and usually cannot be completely accurately predicted, and its end surface is not smooth enough. In addition, the reduction amount of each anvil during the deformation process cannot be accurately limited. Therefore, the traditional mandrel reaming process cannot be accurate. For forming cylindrical forgings, the end face smoothing process needs to be added ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a precise mandrel reaming method for cylindrical forgings, and to solve the technical problem that the prior art cannot accurately form cylindrical forgings

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