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A kind of forging method of ld steel disc blade

A disc blade and forging blank technology, which is applied in the field of ferrous metal material production technology, can solve the problems of blank bending, forging bending section, reducing service life, etc., and achieves increased forging blank thickness, increased forging ratio, and improved non-uniformity. Effect

Active Publication Date: 2018-08-14
TAIER HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using LD, a steel with ledeburite characteristics, to make a single-piece disc blade with a large cross-section and a small thickness, if a billet with a small diameter and a large thickness is used as the billet, it is easy to cause serious bending of the billet during forging. Make the forging process not work properly
In order to ensure the normal operation of the forging process, only billets with larger diameters and smaller thicknesses can be used. However, when forging such billets, due to the small thickness of the billets, they can only be upset and cannot be elongated, otherwise it is easy to cause the forging along the The circumference is bent or even the section is cracked
However, because upsetting forging belongs to unidirectional deformation, the inhomogeneity of carbides such as reticular carbides in LD steel slabs cannot be significantly improved, which directly affects the quality of disc blades and reduces their service life. The shear amount of the steel plate is unstable, and failure forms such as chipping and cracking generally occur when the steel plate is about 500 tons

Method used

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  • A kind of forging method of ld steel disc blade
  • A kind of forging method of ld steel disc blade

Examples

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Effect test

example 1

[0013] Example 1: Forging example of LD steel disc blade for shearing silicon steel

[0014] The finished geometric size of the disc blade is φ400mm*43mm. When forging a single-piece forging blank, the raw material size is φ300mm*116mm, and the forging blank is upset into a forging blank with a size of φ417mm*54mm. The forging ratio is slightly higher than 2, and the carbide grade is 3. grade, the disc blades made have a very low service life. At this time, the metallographic structure of the forging is as follows: figure 1 Shown: the carbides are about grade 5, the structure is coarse, and the carbides are distributed in a network and large blocks (500 X).

[0015] When adopting the forging method of the present invention to forge, the forging blanks of 5 disc blades are combined for forging. That is, when the size of the disc blade is φ400mm*43mm, the blanking size is φ300mm*595mm, the size after the first upsetting is φ417mm*300mm, and the size after the first stretching ...

example 2

[0016] Example 2: Forging example of LD steel disc blade for shearing stainless steel

[0017] The finished geometric size of the disc blade is φ320mm*15mm. When forging a single-piece forging blank, the raw material size is φ250mm*54mm, and it is upset into a forging blank with a size of φ330mm*30mm. The forging ratio is less than 2 and the grade of carbide is 5. The disc blades made have a very low service life. At this time, the metallographic structure of the forging is as follows: figure 1 Shown: the carbides are about grade 5, the structure is coarse, and the carbides are distributed in a network and large blocks (500 X).

[0018] When adopting the forging method of the present invention to forge, the forging blanks of 5 disc blades are combined for forging. That is, when the size of the disc blade is φ320mm*15mm, the blanking size is φ250mm*270mm, the size after the first upsetting is φ332mm*150mm, the size after the first elongation is φ248mm*270mm, and the second up...

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Abstract

The invention discloses a forging method of LD steel disc blades. According to the cross-sectional size and thickness of the disc blades, five disc blades are combined into one forging billet for forging. The specific method is as follows: (1) Cutting: blanking according to the cross-sectional size of one disk and the sum of the thicknesses of five disks; (2) Free forging: three upsetting and three pulling, that is, three times of upsetting and three times of pulling out during forging, at intervals; (3 ) Divide the obtained forging into 5 pieces along the thickness direction. The advantages of the forging method of the present invention: due to the increase in the thickness of the forging billet, "three piercings and three pulling out" can be achieved during forging, which not only increases the forging ratio, but also makes the carbides such as reticular carbides in the LD steel billet uneven performance has been significantly improved.

Description

technical field [0001] The invention relates to a production process of ferrous metal materials, more specifically, the invention relates to a forging method of a LD steel disc blade forging blank. Background technique [0002] Cold-rolled disc blades are important equipment in continuous annealing, pickling, recoiling, slitting, trimming and other strip finishing production units. The quality of the disc blade not only restricts the continuous production capacity of the unit, but also directly determines the precision and quality of the sheared steel plate. When the disc blade works, it bites into the strip to be sheared through the relative movement between the upper and lower disc blades, and separates the strip under great pressure. Therefore, the disc blade is subject to great compressive stress and friction, and its failure forms are mainly wear, chipping and blunt edges. Therefore, the cold-rolled disc blade should have high hardness, strong fatigue resistance, stro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21J5/08
CPCB21J5/002B21J5/08
Inventor 杨晓红高胡鹤马继堂李新根
Owner TAIER HEAVY IND
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