Forging method for efficiently healing hole flaws inside blank with large height-diameter ratio

A technology of internal holes and height-to-diameter ratio, which is applied in the field of forging, can solve the problems of inability to completely forge the internal hole defects and axis looseness of billets with large height-to-diameter ratios, achieve good results, reduce scrap, and increase the internal strain of billets

Active Publication Date: 2012-10-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a forging method with a small reduction rate and high efficiency for healing the internal hole defects of the large height-to-diameter ratio billet, so as to solve the inability to completely forge the internal hole type defects of the large height-to-diameter ratio billet caused by the current forging method, Especially the problem of loose axis

Method used

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  • Forging method for efficiently healing hole flaws inside blank with large height-diameter ratio
  • Forging method for efficiently healing hole flaws inside blank with large height-diameter ratio
  • Forging method for efficiently healing hole flaws inside blank with large height-diameter ratio

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Embodiment 1

[0044] The blanks with large aspect ratio used in this example are 9 continuous casting blanks, the original size is Φ600mm×2000mm, the aspect ratio is 3.33, the material is S45C+B, and the blank with large aspect ratio weighs about 4.4 tons. The temperature is 1200°C. Such as Figure 5a and Figure 5b As shown, there is a very serious penetrating shrinkage cavity defect in the center of the continuous casting slab. Due to the relatively large height and diameter of the continuous casting slab, the upsetting process cannot be used for it, and it can only be directly elongated. First use the wide anvil radial compaction method to press down, and after pressing into a flat square, return it to the furnace and heat it to 1200°C and keep it warm for 3 hours. Figure 6 This is the distribution diagram of the equivalent strain field of the blank when the wide anvil radial compaction method is used for 20% reduction obtained through finite element simulation. It can be seen from t...

Embodiment 2

[0048] The billet with large aspect ratio used in this example is a steel ingot, the original size is Φ1000mm×3000mm, the height-diameter ratio is 3, the material is No. 45 steel, the billet with large aspect ratio weighs about 18 tons, and the heating temperature of the billet is 1200°C . There are relatively serious shrinkage porosity in the center of the steel ingot. Due to the relatively large height and diameter of the steel ingot billet, the upsetting process cannot be used for it, and it can only be directly elongated. First use the wide anvil radial compaction method to press down, and after pressing into a flat square, return it to the furnace and heat it to 1200°C and keep it warm for 5 hours. After the heat preservation is over, turn the billet 90° and use the WHF method to draw it two times, and the reduction rate is 20% each time. After the two passes, continue to elongate the blank and round it to Φ600mm. After the forging is completed, flaw detection is carri...

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Abstract

The invention belongs to the field of forging, and specifically relates to a forging method with a small screw-down rate, which is capable of efficiently healing hole flaws inside a blank with a height-diameter ratio. The forging method adopts a numerical simulation technique to research the distribution status of strain inside the blank in the conventional forging process, thus providing a radial wide anvil compaction process which comprises the following steps of: pressing down the blank by virtue of the radial wide anvil compaction process, wherein flat plates serve as upper and lower anvil; after radial the wide anvil compaction process, returning the blank to a furnace to be re-heated and be subjected to thermal insulation; and turning over the blank by 90 degrees and drawing out the blank by the upper and lower anvil. The forging method is suitable for a free forging process for various blanks (for example continuous-casting blanks) or steel ingots with a large height-diameter ratio and the like, and particularly has good effects on the blank with the large height-diameter ratio and serious centre looseness. Forged pieces produced by the forging method can ensure the healing of the hole flaws inside the blank with the large height-diameter ratio, so that the possibility of forged piece scrapping caused by the loosened and non-forged center of the forged piece is greatly reduced; and moreover, a forged piece with a larger size can be manufactured by virtue of a small screw-down rate.

Description

technical field [0001] The invention belongs to the field of forging, specifically a forging method for healing internal hole-type defects of large-height-diameter ratio billets with small reduction rate and high efficiency. It is suitable for various large-height-diameter ratio billets (such as continuous casting billets) or large Free forging process of high-diameter ratio steel ingots, etc. Background technique [0002] Forging is an important process in the processing of most metal materials. Through forging, the internal quality of forgings can be improved, that is, the as-cast structure is broken, the grains are refined, the structure is uniform, and the shrinkage cavity and pores produced by the metal during the smelting process can be forged. Defects such as cracking and porosity are of great significance to improving the quality of forgings. [0003] During the pouring and subsequent solidification of steel ingots, cavity defects such as shrinkage cavities, porosit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00
Inventor 徐斌孙明月李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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