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A Forging Method for Improving Transverse Mechanical Properties of Flat Square Forgings

A technology for transverse mechanical properties and forgings, applied in the field of free forging, can solve the problems of insufficient consideration of transverse properties, low transverse properties, single forging fiber structure, etc.

Active Publication Date: 2015-08-05
CITIC HEAVY INDUSTRIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the shape of the forging (attached figure 1 ), the traditional process of upsetting and drawing is adopted, the direction of the metal flow line is consistent with the longitudinal direction of the forging, the forging fiber structure is single, the longitudinal performance is much greater than the transverse tangential performance, the anisotropy of the forging performance is obvious, and the transverse performance is the lowest. It does not meet the technical requirements, and the transverse performance shows a decreasing trend with the increase of forging ratio
At present, the production process design of large forgings mainly focuses on the mechanical performance requirements in the longitudinal and tangential directions of forgings, but does not take into account the transverse performance. When users have high requirements for the transverse mechanical properties of forgings, they are often scrapped because the transverse properties of forgings are unqualified.

Method used

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  • A Forging Method for Improving Transverse Mechanical Properties of Flat Square Forgings

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Firstly, the steel ingot WHF method is used for upsetting and drawing to ensure that the core of the steel ingot is fully forged; after drawing, the square is 1400×700×440, that is, the longitudinal length is 1400mm, the transverse length is 700mm, and the tangential length is 440mm. It is consistent with the axis of the steel ingot, that is, the metal flow direction is consistent with the transverse direction of the forging, which improves the transverse performance of the forging; secondly, upsetting along the length direction of 1400mm to H=910mm, and the deformation is controlled at about 35%; flattening along the direction of 910mm to the finished product The size can improve the obvious fiber directionality caused by the main deformation, improve the transverse tangential performance and at the same time improve the performance directionality; 4) heat treatment for forgings; 5) take test bars in transverse direction of forgings for inspection. After the transverse ...

Embodiment 2

[0025] Firstly, the steel ingot WHF method is used for upsetting and drawing to ensure that the core of the steel ingot is fully forged; after drawing, the square is 1400×700×440, that is, the longitudinal length is 1400mm, the transverse length is 700mm, and the tangential length is 440mm. It is consistent with the axis of the steel ingot, that is, the metal flow direction is consistent with the transverse direction of the forging, which improves the transverse performance of the forging; secondly, upsetting along the length direction of 1400mm to H=980mm, and the deformation is controlled at about 30%; flattening along the direction of 980mm to the finished product The size can improve the obvious fiber directionality caused by the main deformation, improve the transverse tangential performance and at the same time improve the performance directionality; 4) heat treatment for forgings; 5) take test bars in transverse direction of forgings for inspection. After the transverse ...

Embodiment 3

[0027] Firstly, the steel ingot WHF method is used for upsetting and drawing to ensure that the core of the steel ingot is fully forged; after drawing, the square is 1400×700×440, that is, the longitudinal length is 1400mm, the transverse length is 700mm, and the tangential length is 440mm. It is consistent with the axis of the steel ingot, that is, the metal flow direction is consistent with the transverse direction of the forging, which improves the transverse performance of the forging; secondly, upsetting along the length direction of 1400mm to H=840mm, and the deformation is controlled at about 40%; flattening along the direction of 840mm to the finished product The size can improve the obvious fiber directionality caused by the main deformation, improve the transverse tangential performance and at the same time improve the performance directionality; 4) heat treatment for forgings; 5) take test bars in transverse direction of forgings for inspection. After the transverse ...

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Abstract

The invention discloses a forging method for improving the horizontal mechanical property of a flat and square forging piece. The secondary upsetting and drawing in different directions can be increased by changing the forging direction to control metal streamline direction in the process, so that the purposes of improving the comprehensive mechanical property while improving the horizontal mechanical property of the forging piece can be fulfilled. The forging method is realized by the following scheme that: a steel ingot is upsetted thick and drawn long, the forging piece is horizontally drawn to be flat and square and is then upsetted thick and drawn long secondarily along the vertical direction, heat treatment is conducted, and finally, mechanical property test is carried out. According to the forging method, the horizontal mechanical property of the forging piece is effectively improved, and the reliability of the forging piece is improved.

Description

technical field [0001] The invention belongs to the technical field of free forging, in particular to a forging method for improving the transverse mechanical properties of flat square forgings. Background technique [0002] At present, flat and square forgings are often used in some fields, and require such forgings to have high transverse strength and longitudinal strength. For example, a 30CrMnSiNi2A flat and square forging for an aerospace industry has complex shapes and special requirements for use. The transverse and tangential mechanical properties of forgings have high requirements and there is no obvious difference. Among them, the transverse tensile strength is greater than 1530MPa, and the tangential tensile strength is greater than 1540MPa. According to the shape of the forging (attached figure 1 ), the traditional process of upsetting and drawing is adopted, the direction of the metal flow line is consistent with the longitudinal direction of the forging, the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00C21D8/06C21D1/19C21D1/26C21D1/28
Inventor 张连振姬立功宋玉冰薛秋云李昌义宋新双马斌陈明董文斐韩利杰阮鑫张思维
Owner CITIC HEAVY INDUSTRIES CO LTD