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A kind of forging method of large back-up roll forging

A support roll, large-scale technology, applied in the field of free forging, to achieve the effect of good performance, shortened product manufacturing cycle, uniform hardness and structure

Active Publication Date: 2020-10-27
CITIC HEAVY INDUSTRIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a forging method for large back-up roll forgings, which solves the technical problem that some large back-up roll forgings must be upset twice to meet the forging ratio and core compaction

Method used

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  • A kind of forging method of large back-up roll forging
  • A kind of forging method of large back-up roll forging

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Roll body diameter D of a backup roll forging 0 =Φ1720mm, weight 65.58t, forged with 97t steel ingot, the ingot body weight is 75.24t.

[0042] After a limit upsetting (H / D=0.5) under the traditional process, the height of the ingot body is H=1450mm, and the average diameter of the ingot body is D=Φ2900mm. At this time, calculate the forging ratio of the back-up roll forging body after upsetting once, that is, (average diameter of steel ingot after upsetting D / diameter of finished forging body D 0 ) 2 =2.84, which cannot meet the manufacturing requirements of the back-up roll body forging ratio greater than 3.0, it is necessary to adopt a two-time upsetting process plan (such as figure 1 shown). Therefore, when forging with the traditional process, the first upsetting meets H / D not less than 0.5, so as to avoid the center sag during the elongation process of the ingot body; the second upsetting meets the total forging ratio greater than 3.0.

[0043] Adopt forging m...

Embodiment 2

[0051] Roll body diameter D of a backup roll forging 0 =Φ1420mm, weight 31.46t, forged with 47t steel ingot, the ingot body weight is 36.59t.

[0052] After a limit upsetting (H / D=0.5) under the traditional process, the height of the ingot body is H=1140mm, and the average diameter of the ingot body is D=Φ2280mm. At this time, calculate the forging ratio of the back-up roll forging body after upsetting once, that is, (average diameter of steel ingot after upsetting D / diameter of finished forging body D 0 ) 2 =2.58, which cannot meet the manufacturing requirements of the back-up roll body forging ratio greater than 3.0, it is necessary to adopt a two-time upsetting process plan (such as figure 1 shown). Therefore, when forging with the traditional process, the first upsetting meets H / D not less than 0.5, so as to avoid the depression in the center of the ingot body during the elongation process; the second upsetting meets the total forging ratio greater than 3.0.

[0053] A...

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Abstract

The invention discloses a forging method of a large supporting roller forge piece, and relates to the technical field of free forging. The forging method comprises the following steps of pressing a riser of a steel ingot with a jaw, rounding an ingot body of the steel ingot and cutting off an ingot tail of the steel ingot to obtain a steel ingot blank; heating the steel ingot blank to 1220-1270 DEG C and preserving heat, wherein the heat preservation time is set according to the size of the ingot body of the steel ingot; upsetting the ingot body of the steel ingot until the ratio of H to D ranges from 0.37 to 0.50; uniformly cooling the surface of the steel ingot to 1000-1100 DEG C so as to enable the inside and outside of the ingot body to form a temperature difference; drawing the ingotbody of the steel ingot by adopting a wide flat anvil; and reheating the drawn blank, drawing out the step of each part of the forge piece to the designed size, cutting off water openings at the two ends of the steel ingot and riser leftovers and forming the finished product. According to the forging method, the effective compaction of a core of the steel ingot can be realized by means of one-timeupsetting and drawing, the technical problem that the large supporting roller forge piece usually needs two-time upsetting is solved, the kinetic energy consumption in the production process of the supporting roller is greatly reduced, and the product manufacturing period is further shortened.

Description

technical field [0001] The invention relates to the technical field of free forging, in particular to a forging method of a large backup roll forging. Background technique [0002] The back-up roll is an important part of the rolling mill equipment. It bears alternating bending stress for a long time during the rolling process, and the working conditions are harsh. It usually needs to be produced by free forging. When the free forging process is used to forge the back-up roll, the forging ratio is generally used to measure the deformation of the forging. A large forging ratio indicates that the forging has been fully deformed during the forging process, so that the defect structure in the core of the ingot can be effectively compacted. Forgings are denser in structure and better in service performance. Therefore, it is generally required in the prior art that the forging ratio of the backup roll body should be greater than 3.0. Due to the structural characteristics of the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21K29/00B21B29/00
CPCB21B29/00B21J5/002B21K29/00
Inventor 刘旺宋玉冰李昌义李春辉金明于保宁薛秋云秦红付汪雨昌郑跃功王永涛
Owner CITIC HEAVY INDUSTRIES CO LTD
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