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Method for improving surface quality of die forging

A technology of surface quality and die forgings, which is applied in the forging of stainless steel blade forgings and stainless steel die forgings. The effect of fire times, avoiding insufficient machining allowance for forgings, and preventing accumulation

Active Publication Date: 2014-03-26
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the past, in the die forging process, we often only paid attention to the size of the forging, and did not pay special attention to the surface quality defects of the forging such as scale and wrinkles. These defects not only affect the accuracy of the magnetic particle flaw detection (MT) of the forging, but also affect the forging itself. beautiful
With the advancement of forging technology and the improvement of customer requirements, forging has been developing in the direction of precision forging with small margins. Therefore, such defects have become less and less accepted by customers.

Method used

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  • Method for improving surface quality of die forging
  • Method for improving surface quality of die forging

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Process a long blade whose length L is 900mm, its structure see figure 2 , figure 2 Middle A is the air inlet side of the blade. The forging heating temperature is set to 1130°C, and the temperature is kept for 30-60 minutes. The mold is designed according to the center difference of the forging. strike forging;

[0027] After forging, the surface of the forging is cleaned. First, the blade is shot blasted with 1.2mm diameter alloy steel shots, and then the defect parts of the blade are polished. It is required to remove all defects such as edges, folds, and burrs.

[0028] After polishing, thermal shaping is carried out. The thermal shaping temperature is 1130°C, and the holding time is 15-30 minutes (half of the original time). During the thermal shaping, the 2mm thick contact plate is removed, and one-shot molding is performed.

[0029] After the hot shaping, the blades are shot blasted again with alloy steel shots. After the shot blasting, visual inspection is c...

Embodiment 2

[0032] Process a long blade whose length L is 600mm, its structure see image 3 , the forging heating temperature is set to 1145°C, and the temperature is kept for 20-40 minutes. The mold is designed according to the center difference of the forging. After the 2mm thick touch plate is placed on the lower mold cavity, the forging hammer is used for 2-3 blow forging;

[0033] After forging, the surface of the forging is cleaned. First, the blade is shot blasted with 1.2mm diameter alloy steel shots, and then the defect parts of the blade are polished. It is required to remove all defects such as edges, folds, and burrs.

[0034] After polishing, thermal shaping is carried out. The thermal shaping temperature is 1145°C, and the holding time is 10-20 minutes (half of the original time). During the thermal shaping, the 2mm thick contact plate is removed, and one-shot molding is performed.

[0035] After the hot shaping, the blades are shot blasted again with alloy steel shots. Afte...

Embodiment 3

[0038] Process a long blade whose length L is 1400mm, its structure see Figure 4 , Figure 4 Middle B is the air inlet side of the blade; the forging heating temperature is set to 1135°C, and the temperature is kept for 40-80 minutes. The mold is designed according to the center difference of the forging. strike forging;

[0039] After forging, the surface of the forging is cleaned. First, the blade is shot blasted with 1.2mm diameter alloy steel shots, and then the defect parts of the blade are polished. It is required to remove all defects such as edges, folds, and burrs.

[0040] After polishing, thermal shaping is carried out. The thermal shaping temperature is 1135°C, and the holding time is 20-40 minutes (half of the original time). During the thermal shaping, the 2mm thick contact plate is removed, and one-shot molding is performed.

[0041] After the hot shaping, the blades are shot blasted again with alloy steel shots. After the shot blasting, visual inspection is ...

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Abstract

The invention provides a method for improving the surface quality of a die forging. The method can obviously improve the surface quality of a forged forging and guarantee the magnetic powder inspection precision effect of the forging. The method is characterized in that the method comprises the following steps of (1) designing a forging die, (2) forging on a hot die forging device, (3) conducting surface cleaning on the forging after forging is finished and (4) conducting hot die forging shaping on the forging after surface cleaning, wherein in the step (1), the forging die is designed according to the medium tolerance of the thickness size envelope amount of the forging; in the step (2), during forging, collision die plates are placed on the two sides of a lower die cavity of the forging die and the closing height of the forging die during forging is controlled through the collision die plates so as to guarantee the thickness size of the forging; in the step (3), shot blasting and a local grinding and modifying method are adopted; in the step (4), the collision die plates are removed during hot die forging shaping.

Description

technical field [0001] The invention relates to the technical field of forging stainless steel blade forgings, in particular to the technical field of forging stainless steel die forgings with large deformation, in particular to a method for improving the surface quality of die forgings. Background technique [0002] In the past, in the die forging process, we often only paid attention to the size of the forging, and did not pay special attention to the surface quality defects of the forging such as scale and wrinkles. These defects not only affect the accuracy of the magnetic particle flaw detection (MT) of the forging, but also affect the forging itself. beautiful. With the advancement of forging technology and the improvement of customer requirements, forging has been developing in the direction of precision forging with small allowances. Therefore, such defects are increasingly unacceptable by customers. Contents of the invention [0003] In view of the above problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K3/04
Inventor 冯晓明李伟姚恒烨
Owner WUXI TURBINE BLADE
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