Method for forging large steel shaft forging

A technology for forgings and shafts, which is applied in the processing field of steel shaft forgings, can solve the problems that are difficult to eliminate or not enough to eliminate internal defects of materials, and achieve the effects of avoiding waste, eliminating internal defects, and reducing damage

Inactive Publication Date: 2010-12-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although four forgings have been carried out on the large end of the forging, the maximum single deformation is 27%, which is often not enough to eliminate the internal defects of the material, which can be

Method used

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  • Method for forging large steel shaft forging
  • Method for forging large steel shaft forging
  • Method for forging large steel shaft forging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 2 As shown, the material of a large-scale shaft forging is a standard ten-ton octagonal steel ingot of No. 30 steel. In the damage control inspection, there is a hole defect with a maximum diameter of about 2mm inside the material. Its forging process includes such as image 3 Steps shown:

[0026] (1) Chamfering and rounding: At the initial forging temperature of 1250°C, the flat anvil is used to carry out chamfering and rounding on the forging hammer, and the deformation is 10% above the final forging temperature of 800°C, and the diameter is reduced from an average of 850mm to 770mm ;

[0027] (2) First overall elongation: heat the forging to the initial forging temperature of 1250°C, and use a flat anvil on the forging hammer to elongate. The deformation amount reaches 29% above the effective hole welding temperature of 900°C, and the diameter decreases to 550mm to eliminate internal defects of forgings;

[0028] (3) Overall elongation again: heat ...

Embodiment 2

[0032] like figure 2 As shown, the material of a large-scale shaft forging is a standard ten-ton octagonal steel ingot of No. 35 steel. For flaw detection, there are holes with a maximum diameter of about 2mm inside the material. Its forging process includes such as Figure 4 Steps shown:

[0033] (1) Chamfering and rounding: at the initial forging temperature of 1250°C, the flat anvil is used to carry out chamfering and rounding on the forging hammer, and the deformation amount reaches 10% above the final forging temperature of 800°C, and the diameter is reduced from 850mm to 770mm;

[0034] (2) The first overall elongation: heat the forging to the initial forging temperature of 1250°C, and use a flat anvil to elongate it on the forging hammer. The deformation reaches 30% above the effective hole welding temperature of 900°C, and the diameter is reduced to 540mm;

[0035] (3) Overall elongation again: heat the forging to the initial forging temperature of 1250°C, and use...

Embodiment 3

[0039] like figure 2 As shown, the material of a large-scale shaft forging is a standard ten-ton octagonal steel ingot of No. 40 steel. For flaw detection, there are holes with a maximum diameter of about 2mm inside the material. Its forging process includes such as Figure 5 Steps shown:

[0040] (1) Chamfering and rounding: At the initial forging temperature of 1200°C, the flat anvil is used to carry out chamfering and rounding on the forging hammer, and the deformation is 10% above the final forging temperature of 800°C, and the diameter is reduced from 850mm to 770mm;

[0041] (2) The first overall elongation: heat the forging to the initial forging temperature of 1200°C, and use a flat anvil on the forging hammer to elongate, and the deformation will reach 31% above the effective hole welding temperature of 900°C, and the diameter will decrease to 530mm;

[0042] (3) Overall elongation again: heat the forging to the initial forging temperature of 1200°C, and use a fl...

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Abstract

The invention discloses a method for forging a large steel shaft forging. The method comprises the following steps of: performing cogging, chamfered edge rounding, whole stretching for the first time, whole stretching again, section-by-section forging and the like on a medium carbon steel standard octagon ingot of which the carbon content is 0.3 to 0.4 percent. The step of whole stretching for the first time comprises the following steps of: heating a forged piece to a primary forging temperature; stretching on a forging hammer with a flat anvil; and reaching the deformation rate of 29 to 31 percent at the effective hole welding temperature of over 900 DEG C so as to overcome internal defects of the forged piece. The step of whole stretching again comprises the following steps of: heating the forged piece to the primary forging temperature; stretching on the forging hammer with the flat anvil; and reaching the deformation rate of 15 to 20 percent at the final forging temperature of 800 DEG C. And the single-time deformation rate of each section when the section-by-section forging is performed should not be less than 20 percent. The method of the invention effectively overcomes the internal defects of the material, reduces the material and working time waste, more reasonably distributes the deformation rate of each step, contributes to the reduction of the forging deforming force and realizes ideal material mechanical property.

Description

technical field [0001] The invention relates to a processing method for a steel shaft forging, in particular to a forging process flow for a large steel shaft forging. Background technique [0002] Large-scale shaft forgings generally refer to forgings with a weight of more than five tons. The material of the steel ingot is generally medium carbon steel, and there are inevitably some defects such as looseness and air bubbles in the steel ingot. The existence of these defects will seriously reduce the strength of the part, so in the end These defects are not permitted in acceptable parts. The processing flow of large shaft forgings is generally "forging-rough turning-flaw detection-heat treatment". The purpose of flaw detection is to check whether the above-mentioned defects still exist after the workpiece is forged. If internal defects are found during the flaw detection process, the forging must be re-forged to eliminate internal cracks or holes by thickening, elongating, ...

Claims

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Application Information

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IPC IPC(8): B21K1/06
Inventor 夏琴香宋阿生程秀全黄苏黎明周驰宗伟奇梁卫良
Owner SOUTH CHINA UNIV OF TECH
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