A high-efficiency forging method for healing internal hole-type defects of billets with large aspect 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 loose axes of billets with large height-to-diameter ratios, achieve good results, reduce scrap, and increase the internal strain of billets

Active Publication Date: 2016-03-02
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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  • A high-efficiency forging method for healing internal hole-type defects of billets with large aspect ratio
  • A high-efficiency forging method for healing internal hole-type defects of billets with large aspect ratio
  • A high-efficiency forging method for healing internal hole-type defects of billets with large aspect ratio

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Effect test

Embodiment 1

[0043] 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. 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 5 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 the figure that the strain of the wide anvil radial compaction is concentrated in the center of the blank, which can be up to 0.4 or more. And as figur...

Embodiment 2

[0047] 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 for healing internal hole-type defects of a large-height-diameter ratio billet with a small reduction rate and high efficiency. The present invention uses numerical simulation technology to study the distribution of the internal strain of the billet in the traditional free forging process, and proposes a wide-anvil radial compaction process: 1) Use flat plates as the upper and lower anvils, and use the wide-anvil radial compaction process to compact the billet Bottom; 2) After the wide anvil is radially compacted, the billet is returned to the furnace to be reheated and kept warm; 3) The billet is turned over 90°, and the upper and lower flat anvils are used for elongation. The invention is applicable to the free forging process of various high-height-diameter-ratio billets (such as continuous casting billets) or high-height-diameter-ratio steel ingots, etc., and has a good effect especially on high-height-diameter ratio billets with severe central looseness. The forgings produced by the invention can ensure the healing of hole-type defects inside the billet with large height-to-diameter ratio, greatly reduce the possibility of scrapping the forgings because the center is loose and not forged, and can manufacture larger-sized forgings due to the lower reduction 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 Patents(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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