A corrosion-resistant alloy flange forging uniform forming process and mold

Abstract

The invention belongs to the field of corrosion-resistant alloy forging processing and relates to a technology and a die for uniformly molding a corrosion-resistant alloy forged flange. A pre-forging and finish-forging double molding technology is adopted, the size of an inner cavity of a pre-forging die is equal to the size of a small head inner cavity of a molding die, and dimensional correspondence acts according to set deformation quantities. The outer diameter A1 of the pre-forging die corresponds to the diameter A of a big head inner cavity of the finish-forging die according to the set deformation quantities. When the flange is forged by the pre-forging die, the diameter of the flange big head can exceed the pre-forging die for a certain quantity, the outer circle A2 of the flange big head can be forged to a size which exceeds the outer circle A1 of the die, and blanks are refilled to fillet Rc parts at the upper end and the lower end of the flange big head in the following forging chamfering process. When the corrosion-resistant alloy flange is molded, the deformation quantities of the flange big head and the flange small head can be accurately and uniformly controlled according to the set deformation quantities. Meanwhile, the problem that the lower part of the flange big head is not full filled when the corrosion-resistant alloy flange is premolded is solved, and the uniform molding of the upper part and the lower part of the flange is realized.

Description

technical field [0001] The invention belongs to the field of corrosion-resistant alloy forging processing. In particular, it relates to a uniform forming process and mold for a corrosion-resistant alloy forged flange. Background technique [0002] Corrosion-resistant alloys refer to alloys containing high Cr (17%~25%), high Ni (40%~50%), and high Mo (2%~5%). It has the characteristics of high temperature strength, good plasticity and toughness, and good corrosion resistance. Therefore, it is widely used in petrochemical, flue gas desulfurization, coal chemical, salt chemical, oil and gas field mining and other fields, and has become an indispensable metal corrosion-resistant material. [0003] Corrosion-resistant alloy flanges are currently produced by free forging. Due to the high deformation resistance of corrosion-resistant alloys, multiple forgings are generally required. During forging, the small head of the flange is usually forged first, and then returned to the furn...

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Problems solved by technology

[0006] In order to overcome the shortage of pre-forging dies used in the prior art, the purpose of the present invention is to provide a uniform forming process and die for forging corrosion-resistant alloy flanges, which can accurately control the uniform deformation of the flange in the final forming, and realize the big end and small end of the flange. At the same time, it solves the problem of insufficient filling of the lower part of the flange head. From the fillet filling of the flange head of about R40 to R6 during general forging, it saves materials, reduces machining allowances, and improves material utilization and production efficiency.

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