Axial closed rolling forming device and method for metallic thin circular plate with large radius-thickness ratio

Abstract

The invention discloses an axial closed rolling forming device and method for a metallic thin circular plate with a large radius-thickness ratio. The device comprises an upper die and a lower die, wherein a cavity is formed in the lower die, a boss matched with the cavity is arranged on the upper die, the bottom end surface of the boss is a conical surface, and the included angle between the conical surface and the horizontal plane is 4-12 degrees. The method comprises the following steps: heating a blank, and preheating an upper die and a lower die; putting the blank in a groove part of the lower die to be positioned; making the lower die rotate and the upper die apply pressure, wherein when the pressure reaches a specified stroke, the upper die stops pressing downwards, and the lower die continues to rotate to shape disk forgings; and after forging is finished, carrying out air cooling and heat treatment. A closed rotary forging technology is adopted, and the axial direction is adopted, so that on one hand, the problem of overlarge load can be solved, the requirements for equipment and cost are reduced, the forming temperature is reduced, the forming precision is improved, and grains are refined, and on the other hand, due to the stress and the needed positioning table arranged in the groove part, the center cracking condition can be avoided, and the structure consistency can be improved to a certain extent, and the performance isotropy is achieved.

Description

technical field [0001] The invention relates to the technical field of part forming, in particular to an axially closed rolling forming device and method for a metal thin circular plate with a large diameter-thickness ratio. Background technique [0002] At present, metal circular plate parts are mainly formed by open die forging. However, due to the large diameter of the metal circular plate and the large ratio of diameter to thickness, higher requirements are placed on the tonnage of forging equipment, and some Forming problems, such as the rapid temperature drop caused by the contact between the blank and the upper mold surface, the metal thin disc parts with large diameter-thickness ratio are easy to crack, and the edge of the disc is easy to warp and rebound; in addition, the metal disc parts formed by the current process The performance appears anisotropy, which is easy to produce weak areas, which is not conducive to the service process of finished products. [0003]...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a large-diameter-thick-ratio metal thin disc axial closed rolling forming device and method to solve the problems in the prior art. The axial closed rolling technology can solve the load on the one hand. If the problem is too large, reduce the requirements for equipment and cost, reduce the forming temperature, improve the forming accuracy and refine the grain. Cracking can also improve organizational consistency to a certain extent and achieve isotropic performance

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