Process utilizing upper flat and lower V-shaped anvil to forge stepped shafts

A process method and technology for stepped shafts, which are applied to the field of forging stepped shafts with upper and lower V anvils, can solve the problems of poor forging permeability, prolonged forging time, influence of forging temperature, etc., and achieve good internal stress state of billet, good stress state and good quality. The effect of forging

Inactive Publication Date: 2012-07-04
ZHONGYUAN SPECIAL STEEL +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When forging stepped shaft forgings, if the difference in the diameter of the steps is large, the upper and lower anvils are used to pull out longer, and the upper anvil needs to be replaced during forging, which will prolong the forging time, affect the forging temperature, and even increase the number of heating times; if the upper and lower V-shaped The an

Method used

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  • Process utilizing upper flat and lower V-shaped anvil to forge stepped shafts
  • Process utilizing upper flat and lower V-shaped anvil to forge stepped shafts

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[0026] Φ1365mm backup roll billet (material 70Cr3Mo) has a roll body size of Φ1365mm, large steps on both sides of the roll body are Φ815mm, and small steps are Φ560mm. The entire forging process is completed on a 5000t hydraulic press, which is divided into forged roll body and steps on both sides of the forged roll body Two stages; after the forging of the roller body is completed, the forging blank is Φ1365mm, and the forging blank is sent back to the heating furnace for heating. At the same time, the hydraulic press replaces the anvil, the upper anvil is replaced with a flat anvil with an axial width of 700mm, and the lower anvil is replaced with an upper axial anvil width. 700mm V-shaped anvil: V-shaped angle 120°, opening width 1180mm, such as figure 1 As shown, when the forging billet is heated to 1250±10°, step forging is carried out. First, the size of the steps on both sides of the roll body is extended to Φ815mm, and then the two ends are extended to a small step siz...

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Abstract

The invention relates to a process for forging stepped shafts, in particular to a process utilizing an upper flat and lower V-shaped anvil to forge stepped shafts. The method utilizing the upper flat and lower V-shaped anvil to forge the stepped shafts includes the following steps of rotating a blank by 45 degrees once the anvil is pressed, rotating the blank by 180 degrees at each step including four times of pressing of the anvil, and finally rotating the blank by 360 degrees in each cycle including two steps. The process has the advantages that a deformation area of a forged part has fine stress states, a center area of the forged part has excellent forge penetration, the offset of the axis of the deforming portion is low, the internal stress of the blank is fine, no tensile stress is applied to the transverse direction, and center compaction is facilitated.

Description

technical field [0001] The invention relates to a method for forging a stepped shaft, in particular to a process method for forging a stepped shaft with an upper flat and a lower V anvil. Background technique [0002] There are two methods of forging round shaft forgings on a hydraulic press: the flat anvil is drawn and then rounded, and the type anvil is directly drawn and lengthened. The commonly used methods for drawing the elongate axis of the shaped anvil include drawing the length of the upper and lower type anvils, and drawing the length of the upper and lower V-shaped anvils. When forging stepped shaft forgings, if the difference in the diameter of the steps is large, the upper and lower anvils are used to pull out longer, and the upper anvil needs to be replaced during forging, which will prolong the forging time, affect the forging temperature, and even increase the number of heating times; if the upper and lower V-shaped The anvil is long, no need to replace the ...

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Application Information

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IPC IPC(8): B21K1/10
Inventor 高全德崔晓宁梁晨王连东王金宝孙振环张建
Owner ZHONGYUAN SPECIAL STEEL
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