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Hourglass-shaped forging method for preventing surface cracks

A surface crack, hourglass-shaped technology, applied in the field of forging, can solve problems such as surface cracks, achieve uniform deformation, improve deformation uniformity, and facilitate engineering.

Active Publication Date: 2019-09-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide an hourglass-shaped forging method for preventing surface cracks, which is used to solve the problem of surface cracks caused by surface tensile stress in the production process of forgings

Method used

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  • Hourglass-shaped forging method for preventing surface cracks
  • Hourglass-shaped forging method for preventing surface cracks
  • Hourglass-shaped forging method for preventing surface cracks

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Embodiment

[0040] like figure 1 As shown, the embodiment of the present invention provides a method for simulating and determining the hourglass-shaped process design. Computer simulation software is used to calculate the upsetting and pressing process of ordinary cylindrical blanks. The bulge produced by pressing is used to mark the feature points and reverse calculation to obtain the position of the feature points in the original blank, and based on this, the calculation model of the hourglass-shaped blank is designed. Simulate the upsetting process of the hourglass-shaped billet calculation model, analyze and compare after pressing to the required deformation, correct the size, and calculate again to obtain the size of the hourglass-shaped billet that does not produce a belly under the required upset reduction.

[0041] like figure 2 As shown, the embodiment of the present invention provides an hourglass-shaped blank with a maximum diameter of 1 m. After the first upsetting and elonga...

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Abstract

The invention belongs to the field of forging, and particularly relates to an hourglass-shaped forging method for preventing surface cracks; and the method is applicable to upsetting production processes of forge pieces. The method comprises the following steps of firstly, designing a hourglass-shaped blank, specifically determining the size of the hourglass-shaped blank which does not generate bulging under the required upsetting rolling reduction by utilizing a computer simulation software; prefabricating thehourglass-shaped blank, specifically in the drawing process, forming the outside ofthe blank into a hourglass shape, or adopting a riveting upsetting or end surface rolling method to obtain the hourglass-shaped blank; and finally forming, specifically upsetting the blank according to the required rolling reduction, and finally forging the blank into the required specification size.According to the method, the problem that in the production process of forge pieces, the surfaces of the forge piecesare subjected to upsetting to form transverse surface cracks or transverse surface crack sources is solved; and by adopting the forging method, the crack defects on the surfaces of the forge pieces can be avoided, and the deformation uniformity of the forge pieces can be improved.

Description

technical field [0001] The invention belongs to the field of forging, in particular to an hourglass-shaped forging method for preventing surface cracks, which is suitable for the upsetting production process of forgings. Background technique [0002] As the core components of large-scale complete sets of equipment in the fields of metallurgical machinery, petrochemical industry, transportation, energy and electric power, forgings play an extremely important role in national economic construction, national defense equipment and major scientific installations. Its production capacity and quality level are measured It is an important symbol of a country's autonomy and national strength. Therefore, it is of great significance to improve the quality of forgings and ensure their safety and reliability during operation. [0003] Upsetting is an extremely important process in the production of forgings. It can destroy the as-cast dendritic structure, refine the grains of the intern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00
CPCB21J5/00
Inventor 徐斌刘生张军强孙明月李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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