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Drawing-out method for high-speed steel cold roll neck

A technology for cold rolling and high-speed steel, which is applied in the field of elongation of high-speed steel cold rolling roll necks, can solve the problems of large residual stress in the core of forgings, increase in temperature of the core of forgings, and large accumulated deformation, so as to improve the qualification of forgings. rate, changing stress state, and the effect of uniform deformation

Inactive Publication Date: 2016-04-27
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, when the forging steps are drawn out, the cumulative deformation is relatively large due to repeated pressing and deformation at the same position. On the one hand, the residual stress caused by uneven deformation in the center of the forging is relatively large; As the temperature of the core of the forging rises, the strength of the billet will decrease. The above two factors are likely to cause defects in the core of the forging

Method used

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  • Drawing-out method for high-speed steel cold roll neck

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Comparison scheme
Effect test

Embodiment 1

[0029] The high-speed steel cold rolling roll blank, wherein the diameter of the roll neck part is φ900mm, and the length is 450mm, the roll neck part needs to be drawn now, and the specific process steps of the drawing method of the present invention are as follows:

[0030] a. After the billet is heated, it is transferred to the forging platform to press the shoulder;

[0031] b. Starting from the pressure shoulder, the lower anvil is drawn sequentially along the axial direction of the blank to the end. The width of the lower flat anvil is 500 mm, and the feeding amount is 0.5 to 0.7 times the width of the lower flat anvil. Therefore, the feeding amount of each time can be obtained It is 250-350mm, and the relative reduction is 8%-12%, so the reduction is controlled between 80-120mm;

[0032] c. Flip the blank by 90°, and lengthen the other side according to the parameters in step c. Similarly, the anvil is drawn from the shoulder along the axial direction of the blank, and ...

Embodiment 2

[0036] The high-speed steel cold rolling roll billet, wherein the diameter of the roll neck part is φ750mm, and the length is 400mm, the roll neck part needs to be drawn now, and the specific process steps of the drawing method of the present invention are as follows:

[0037] a. After the billet is heated, it is transferred to the forging platform to press the shoulder;

[0038] b. Starting from the pressure shoulder, the lower anvil is drawn sequentially along the axial direction of the blank to the end. The width of the lower flat anvil is 500 mm, and the feeding amount is 0.5 to 0.7 times the width of the lower flat anvil. Therefore, the feeding amount of each time can be obtained It is 250-350mm, and the relative reduction is 8%-12%, so the reduction is controlled between 60-90mm;

[0039] c. Flip the blank by 90°, and lengthen the other side according to the parameters in step c. Similarly, the anvil is drawn from the shoulder along the axial direction of the blank, and ...

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Abstract

The invention relates to a drawing-out method for a high-speed steel cold roll neck, and belongs to the technical field of forging. The drawing-out method includes the following process steps that back necking is preheated; then starting from the necking, a lower anvil is sequentially drawn out to the end in the axial direction of a blank; after each plane is drawn out, the blank is turned over by 90 degrees, a next adjacent plane is drawn out, and as well, starting from the necking, the lower anvil is sequentially drawn out to the end in the axial direction of the blank; and finally, chamfering is carried out on the blank which is drawn out to be in the size meeting the process requirement. By means of the drawing-out method, deformation of a forge piece can be more even in the axial direction, the stress state of the surface and the core can be changed, defects are prevented, and the percent of pass of the forge piece is improved.

Description

technical field [0001] The invention relates to a method for elongating a roll neck of a high-speed steel cold rolling roll, and belongs to the technical field of forging. Background technique [0002] When forging high-speed steel cold rolls, due to its high alloy content, high forging difficulty, low material utilization rate, and high production costs, the popularization and use of forged high-speed steel rolls is limited. When producing stepped shaft forgings, they usually rotate repeatedly at the same position when they are elongated and deformed. After the size of the forging at this position reaches the size required by the process, the forging is sent forward. In this way, when the forging steps are elongated, the cumulative deformation is relatively large due to repeated pressing and deformation at the same position. On the one hand, the residual stress caused by uneven deformation in the center of the forging is relatively large; As the temperature of the core of ...

Claims

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Application Information

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IPC IPC(8): B21J5/06
CPCB21J5/06
Inventor 李建辉李俊陈建祥
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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