Forging process of plate element

A process and plate technology, which is applied in the field of plate forging process, can solve the problems of difficult correction, large outer circle size and thin thickness of mirror plates and head slabs, so as to avoid uneven hardness, meet processing requirements, Guarantee the effect of special requirements

Inactive Publication Date: 2010-09-08
ERZHONG GROUP DEYANG HEAVY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are as follows: 1) Since the axial thickness of the blank tends to decrease as a whole, in step c, due to the small axial thickness of the blank, the overall warping deformation is prone to occur during stretching, because the mirror plate and the head The outer circle of the slab is large and thin, and it is difficult to correct after deformation
2) In step c, due to the large outer diameter of the billet, it is impossible to upset as a whole, so

Method used

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  • Forging process of plate element
  • Forging process of plate element
  • Forging process of plate element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] After heating the extra-large steel ingot 1 in a heating furnace with good furnace temperature uniformity, use a 160MN hydraulic press to follow the forging process of "cutting → upsetting, punching → reaming → elongating → reaming → gas cutting → flattening → gas cutting" The process produces mirror panels for 700MW units, and the results are as follows:

[0044] 1) From the results of flaw detection (UT-ultrasonic testing, MT-magnetic particle testing, PT-penetration testing), the mirror plate forgings did not find any defects that should be recorded, and the quality was good.

[0045] 2) Forging is easy, and it can effectively prevent quality problems such as concave center of the end face, eccentricity of inner and outer diameters, and warping of the end face during hole reaming.

[0046] 3) Uniform deformation during the forging process and consistent final forging temperature are more conducive to the refinement and uniformity of grains, fully ensuring the special...

Embodiment 2

[0049] The same forging process as in Example 1 is used to produce the head slab, but the inner hole in the slab 5 is not processed during the final gas cutting, that is, the head slab is formed, and the results are as follows:

[0050] 1) According to the results of flaw detection (UT, MT, PT), the head slab forgings did not find any defects that should be recorded, and the quality is good.

[0051] 2) The problem of the limitation of the head slab forming equipment is solved.

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Abstract

The invention discloses a forging process of a plate element with better processing quality. The process is characterized by comprising the following steps of: upsetting and punching a steel ingot and then forging the formed blank into a barrel-shaped intermediate blank; then splitting the barrel-shaped intermediate blank and then flattening to form a plate blank; and finally obtaining a finished product by cutting on the plate blank. In the invention, through forging the blank into the barrel-shaped intermediate blank to realize the axial-enlarging deformation mode of the blank, instead of a axial-upsetting deformation way, a laminated defect easily occurring when a cake-shaped part is forged is avoided, and the forging penetration performance is better; a forging tissue with more compact inner and outer surfaces is reserved by utilizing the finished product cut from the plate blank with uniform deformation and coincident final forging temperature, which is more beneficial to crystal grain refining and crystal grain uniformity and fully ensures the special requirement for the quality of a forging part; and in addition, the process also effectively avoids rigidity nonuniformity caused by the radial C segregation of the steel ingot. Thus, through the process, the processing quality of the product can be markedly improved, and the processing requirement of a large mirror plate or an end sealing plate blank is satisfied.

Description

technical field [0001] The invention relates to the field of forging, in particular to a forging process of a plate. Background technique [0002] The "plate" mentioned in this application includes a pie-shaped piece with or without holes. Its general D / H (ratio of outer diameter to height) ≥ 15. For example, mirror plates for hydroelectric generators, head slabs for pressure vessels, etc. [0003] Taking the large mirror plate in a 700MW hydroelectric generator set as an example, its outer diameter is close to 5500mm, its inner diameter is close to 4000mm, and its thickness is close to 150mm. Such as Figure 1-7 As shown, the existing forming process for the mirror plate includes the following steps: a. Upsetting and punching the steel ingot 1 to form a blank; b. Reaming the blank so as to maintain the blank while increasing the inner and outer diameter of the blank. The thickness in the axial direction is basically unchanged, and then it is flattened in the axial direct...

Claims

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Application Information

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IPC IPC(8): B21J5/00
Inventor 孙海燕张清华孟相利孙嫘
Owner ERZHONG GROUP DEYANG HEAVY EQUIP
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