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Forging process of large axle-shaped forgings

A technology for shafts and forgings, applied in the processing of large shaft forgings, can solve the problems of affecting product quality, many impurities in the riser, easy to produce brittle cracks, etc., and achieve the effects of good product quality, stable structure and uniform chemical composition.

Active Publication Date: 2016-11-09
ANHUI RUIJIE FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the cracks are very small, and after rough machining, there may be surface cracks that have not been found before the first time. Careful people will find that most of this situation occurs at the riser end of the steel ingot, because the riser has many impurities and the surface quality is rubbed. Uneven, brittle cracks are prone to occur during the forging process, appearing on the surface of forgings in the form of surface cracks, surface and internal cracks of large shaft forgings, affecting product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A forging process for large shaft forgings, the process is composed of the following steps:

[0014] (1) Select the blank, remove the riser and the nozzle, and the removal amount is 5%;

[0015] (2) Put the blanks into the furnace, leave a gap between the blanks, and the gap distance is 4mm;

[0016] (3) Heat the billet in the furnace once, the heating temperature is 1100°C, and then heat preservation treatment, the heat preservation temperature is 1100°C, the heat preservation time is 20 minutes, and then upsetting and elongation are carried out. The forging ratio is 4;

[0017] (4) Perform secondary heating on the large shaft forgings in the furnace, the secondary heating temperature is 1000°C, and then carry out secondary heat preservation treatment, the secondary heat preservation temperature is 1000°C, the secondary heat preservation time is 40 minutes, and then upsetting Thick and long, the forging ratio is 3;

[0018] (5) The large shaft forgings in the furnac...

Embodiment 2

[0022] A forging process for large shaft forgings, the process is composed of the following steps:

[0023] (1) Select the blank, remove the riser and nozzle, and the removal amount is 9%;

[0024] (2) Put the blanks into the furnace, leave a gap between the blanks, and the gap distance is 8mm;

[0025] (3) The billet in the furnace is heated once, the heating temperature is 1150°C, and then heat preservation treatment is carried out, the heat preservation temperature is 1150°C, the heat preservation time is 22 minutes, and then upsetting and elongation are carried out. The forging ratio is 4.3;

[0026] (4) Perform secondary heating on the large shaft forgings in the furnace, the secondary heating temperature is 1025°C, and then carry out secondary heat preservation treatment, the secondary heat preservation temperature is 1025°C, the secondary heat preservation time is 45 minutes, and then upsetting Thick and long, the forging ratio is 3.3;

[0027] (5) The large-scale sh...

Embodiment 3

[0031] A forging process for large shaft forgings, the process is composed of the following steps:

[0032] (1) Select the blank, remove the riser and the nozzle, and the removal amount is 13%;

[0033] (2) Put the billets into the furnace, leave a gap between the billets, and the gap distance is 12mm;

[0034] (3) Heat the billet in the furnace once, the heating temperature is 1200°C, and then heat preservation treatment, the heat preservation temperature is 1200°C, the heat preservation time is 25 minutes, and then upsetting and elongation are carried out. The forging ratio is 4.5;

[0035] (4) Perform secondary heating on the large shaft forgings in the furnace, the secondary heating temperature is 1050°C, and then carry out secondary heat preservation treatment, the secondary heat preservation temperature is 1050°C, the secondary heat preservation time is 50 minutes, and then upsetting Thick and long, the forging ratio is 3.5;

[0036] (5) The large shaft forgings in th...

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Abstract

The invention discloses a forging process of large axle-shaped forgings, and belongs to the technical field of machining of the large axle-shaped forgings. The process comprises the following steps that (1) blanks are selected, and risers and water gaps are cut off; (2) the blanks are put into a furnace, and gaps are reserved among the blanks; (3) the blanks inside the furnace are subjected to primary heating, primary heat insulation treatment, upsetting and drawing out in sequence, and the forging ratio is 4-5; (4) secondary heating, secondary heat insulation treatment, upsetting and drawing out are conducted in sequence, and the forging ratio is 3-4; (5) thrice heating, thrice heat insulation treatment, upsetting and drawing out are conducted in sequence, and the forging ratio is 1.8-3.1; and (6) the large axle-shaped forgings are subjected to normalization treatment immediately. The surfaces and the interiors of the large axle-shaped forgings are free of cracks; the chemical components of the large axle-shaped forgings are uniform and stable in structure; and the large axle-shaped forging products are good in quality and high in economic benefit.

Description

technical field [0001] The invention belongs to the technical field of processing large-scale shaft forgings, and in particular relates to a forging process for large-scale shaft forgings. Background technique [0002] In the free forging industry, it is very common to forge large shaft forgings, but when forging large shaft forgings, the whole steel ingot is generally used for blanking, and forgings often fail ultrasonic flaw detection, and surface cracks are often found. Moreover, the cracks are very small, and after rough machining, there may be surface cracks that have not been found before the first time. Careful people will find that most of this situation occurs at the riser end of the steel ingot, because the riser has many impurities and the surface quality is rubbed. Unevenness, brittle cracks are prone to occur during the forging process, appearing on the surface of forgings in the form of surface cracks, surface and internal cracks of large shaft forgings, affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 吕美莲刘春超冯宝倪吕俊吕诚
Owner ANHUI RUIJIE FORGING
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