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Method for eliminating method of inner cavity of shaft type heavy forged piece

A technology for large forgings and shafts, which is applied in the field of modification processing of metal materials, can solve the problems of reduced material strength and increased material cost, and achieve the goal of eliminating internal cavities, avoiding the reduction of material strength, and reducing the cross-sectional area Effect

Inactive Publication Date: 2012-06-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since the existence of voids will inevitably lead to a reduction in the strength of the material, in the past, in order to achieve the predetermined design strength, the design size of the part was often increased, and the weakening of the material strength by the internal voids was offset by increasing the input of materials, so it will be Increase in material cost

Method used

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  • Method for eliminating method of inner cavity of shaft type heavy forged piece
  • Method for eliminating method of inner cavity of shaft type heavy forged piece
  • Method for eliminating method of inner cavity of shaft type heavy forged piece

Examples

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Effect test

Embodiment 1

[0032] The large shaft forgings are carbon steel 08 steel with low carbon content (carbon content: 0.05-0.11wt%). Such as figure 1 As shown, the shaft-type large forging is a cuboid steel ingot 10 with a cross-sectional size of 500mm×500mm. It is found by radiographic inspection that there is a cavity 20 with a maximum diameter of 2.0mm near the center. Forging and controlling the amount of unidirectional compression deformation The method removes holes. The material of the lower anvil 31 and the last anvil 32 is designed to be H13, the anvil X direction (left and right direction) dimension L=800mm, and the Y direction (front and rear direction) dimension B=300mm. In the left-right direction (X-axis direction) of the cross-section of the large shaft-type forging, the dimensions of the lower anvil 31 and the upper anvil 32 should be at least 50% larger than the cross-section of the large shaft-type forging.

[0033] Check the forging manual to determine that the initial forgi...

Embodiment 2

[0040]In this example, the steel ingot material of the large shaft forging is changed to carbon steel 35 steel with a middle carbon content (carbon content: 0.32-0.39%); first heat the steel ingot to 1250°C in a heating furnace according to the data in the manual, and keep it warm for 35 minutes. The steel ingot was forged according to the operation process of Example 1. After testing, when the unidirectional compression deformation reached 28.5%, the radiographic flaw detection showed that the cavities had completely bonded to each other.

Embodiment 3

[0042] In this example, the steel ingot material of the large shaft forging is changed to carbon steel 60 steel with higher carbon content (carbon content: 0.57-0.65%), and the steel ingot is first heated to 1200°C in the heating furnace according to the data in the manual, and kept for 30 minutes According to the operation process of Example 1, the steel ingot was forged. After testing, when the unidirectional compression deformation reached 30.6%, the radiographic flaw detection showed that the cavities had completely bonded to each other.

[0043] In the above examples, the heating temperature and holding time can be determined by consulting the forging manual; and the required compression amount does not change much with the replacement of the carbon steel material grade, only because low carbon steel is compared with high carbon steel. , the strength is low, the plasticity is good, and the amount of compression deformation required to eliminate the cavity is small, while t...

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Abstract

The invention discloses a method for eliminating the inner cavity of a shaft type heavy forged piece, which comprises the steps of firstly heating and preserving heat in accordance with the heating specification specified by a forging and stamping manual according to the trademark of carbon steel material of the shaft type heaving forged piece; then horizontally arranging one segment of the heated steel ingot in the middle of a lower anvil of a forging hammer under the condition of maintaining the temperature of the shaft type heavy forged piece to be 900 DEG C, and striking the upper anvil downwards along with the head of the forging hammer so as to deform the shaft type heavy forged piece and make the single-way compression deformation of the shaft type heavy forged piece reach 28-32% under the condition of not overturning the shaft type heavy forged piece; eliminating the cavity in the stricken segment of the shaft type heavy forged piece; and continuing to strike the shaft type heavy forged piece after moving the shaft type heavy forged piece by 70-80% of the width of the upper anvil along the length direction, and eliminating the cavity in the whole shaft type heavy forged piece. The method can improve the strength of the material and reduce the product cost when eliminating the cavity in the shaft type heavy forged piece.

Description

technical field [0001] The invention relates to a modification processing method of metal materials, in particular to a method for eliminating internal cavities of large shaft forgings. Background technique [0002] Large shaft forgings refer to steel ingot forgings with a weight of more than five tons. The material of the steel ingot is generally carbon steel, and the cross-sectional size is generally a square with a side length of 400-500mm. Due to the large size of the steel ingot, during the solidification process of the steel ingot, the closer to the surface of the workpiece, the lower the temperature, so the solidification process expands from the surface to the center, that is, the surface solidifies first and the core solidifies later. When the core begins to solidify, a solid and thick shell has formed on the surface. Due to the phenomenon of thermal expansion and contraction, the volume shrinkage of the core material during solidification will not be supplemented, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/06
Inventor 夏琴香程秀全黎明宗伟奇宋阿生霍育林谢合清向延平
Owner SOUTH CHINA UNIV OF TECH
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