Method for forging thick-walled ring-shaped parts

A technology of annular parts and process steps, applied in the field of forging, can solve the problems of low qualified rate of ultrasonic flaw detection, excessive density of forgings, difficult quality assurance, etc., and achieve the effects of improving segregation and inclusion defects, improving internal quality, and improving the qualified rate.

Inactive Publication Date: 2012-01-18
JIANGYIN ZENKUNG FORGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. The original forging process and existing problems
Although the forging ratio is large enough (up to 3.5~7) using this process method, due to the RST effect Excessive upsetting ratio is not conducive to the improvement of internal quality.

Method used

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  • Method for forging thick-walled ring-shaped parts
  • Method for forging thick-walled ring-shaped parts
  • Method for forging thick-walled ring-shaped parts

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Embodiment Construction

[0020] The thick-walled ring forging method of the present invention comprises the following process steps:

[0021] Step 1. Steel ingot sawing and blanking

[0022] Step 2, upsetting and punching

[0023] Step 3. Pull out the mandrel

[0024] Step 4, the second upsetting and finishing forming.

[0025] Through theoretical calculations, simulation experiments and production practice, we have determined that the method and deformation of the mandrel have a great influence on the quality of the forgings, and adopt the upper flat lower V-shaped anvil forging method And the draw ratio is controlled at

[0026] The best effect is between 1.8 and 2.2. The improved forging process such as Figure 1a )~d).

[0027] Notes:

[0028] Note: RST effect: Rigid Slid Tearing Effect—rigid sliding tearing effect—"Large Castings and Forgings" 1991-4).

[0029] Note: Forging method of upper flat and lower V-shaped anvil: see figure 2 .

[0030] Note: Steel ingot without riser, se...

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Abstract

The invention relates to a method for forging thick-walled ring-shaped parts. The method includes the following process steps: step 1: steel ingot sawing; step 2: upsetting and punching; step 3: drawing out on a mandril: the drawing-out ratio is controlled at 1.8 to 2.2; and step 4: secondary upsetting and finishing. Since the method adds the processes of drawing out on the mantril and secondary upsetting after punching, in the process of drawing out on the mantril or reaming, the effective wall thickness of the forging is already quite small, pressure can be easily transferred to the central part of the forging during forging, the deformation pressure can deform the core of the billet due to the great reduction of the effective forged thickness, moreover, the core receives pressure stress in three directions, the as-cast structure of the steel ingot is changed, in-situ pores are forged to be closed, the defects of segregation and inclusion are improved, and thereby the internal quality of the forging is greatly improved.

Description

technical field [0001] The invention relates to a method for forging a thick-walled ring. It belongs to the field of forging technology. Background technique [0002] 1. Common problems of thick-walled ring forgings [0003] For thick-walled ring parts with a wall thickness greater than 500mm and a height greater than 450mm, the pass rate of ultrasonic flaw detection is low, and it shows that the larger the diameter of the forging and the heavier the tonnage, the less likely it is to pass the ultrasonic flaw detection. According to the experimental analysis, the ultrasonic flaw detection of such products is unqualified, mainly because the as-cast structure in the forging has not completely changed, and there are defects such as dendrites, looseness, and segregation. These defects are accompanied by non-metallic inclusions, forming so-called tiny pores and cracks. , resulting in unqualified ultrasonic flaw detection. The reason is that the internal compressive stress and d...

Claims

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Application Information

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IPC IPC(8): B21J5/06
Inventor 刘圣祥周顺华
Owner JIANGYIN ZENKUNG FORGING CO LTD
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