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A Quenching Method for Large Shaft Forgings

A large-scale, forging technology, applied in the direction of quenching agent, furnace type, furnace, etc., can solve the problems of uneven internal structure, slow cooling speed, insufficient hardness, etc., to avoid insufficient hardness, prevent quenching cracking, and slow heat transfer. Effect

Active Publication Date: 2016-11-30
马鞍山金泉工业介质科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the fact that the existing quenching methods tend to cause insufficient hardness, uneven internal structure and quenching cracks in large shaft forgings after quenching, the present invention provides a quenching method for large shaft forgings. The quenching liquid of the present invention is cooled at a high temperature stage. The quenching speed is slightly higher than that of quenching oil and close to ordinary distilled water. The cooling speed is very slow at Ar1 temperature, and the quenching liquid close to fast oil can make the surface of large shaft forgings made of 35CrMo steel uniform after normalizing. Heat transfer is slow in the low temperature stage, which effectively releases tissue stress and prevents quenching cracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of quenching method of large-scale shaft forging, described large-scale shaft forging is 35CrMo steel large-scale shaft forging, and its steps are:

[0037] (1) Prepare the quenching liquid, the composition and mass parts of the quenching liquid are: polypropylene grafted glycidyl methacrylate (referred to as PP-g-GAM, purchased from Hangzhou Tuomu Technology Co., Ltd.) and polyacrylamide mixture 10 parts (the mass ratio of polypropylene-methacrylic acid to polyacrylamide is 1:1), 3 parts of random copolymer of ethylene oxide and propylene oxide (average molecular weight is 20000), polyamide polyethylene glycol 3 Part, 0.4 part of defoamer (polyether, average molecular weight is 6000), 5 parts of water, 4 parts of dispersant (polydimethylsiloxane);

[0038] (2) Heat the large shaft forging (10 meters in length and 500mm in diameter) to 880°C, and then keep it warm for 2.2 hours;

[0039] (3) quenching by immersing the large-scale shaft forging after the heat prese...

Embodiment 2

[0049] A kind of quenching method of large-scale shaft forging, described large-scale shaft forging is 35CrMo steel large-scale shaft forging, and its steps are:

[0050] (1) Prepare the quenching liquid, the composition and mass parts of the quenching liquid are: polypropylene grafted glycidyl methacrylate (referred to as PP-g-GAM, purchased from Hangzhou Tuomu Technology Co., Ltd.) and polyacrylamide mixture 8 parts (the mass ratio of polypropylene-methacrylic acid to polyacrylamide is 1:1), 4 parts of random copolymer of ethylene oxide and propylene oxide (average molecular weight is 25000), polyamide polyethylene glycol 2 Part, 0.5 part of defoamer (polyether, average molecular weight is 8000), 7 parts of water, 2 parts of dispersant (polydimethylsiloxane);

[0051] (2) Heat the large shaft forging (8 meters in length and 450mm in diameter) to 850°C, and then keep it warm for 3 hours;

[0052] (3) quenching by immersing the large-scale shaft forging after the heat preserv...

Embodiment 3

[0062] A kind of quenching method of large-scale shaft forging, described large-scale shaft forging is 35CrMo steel large-scale shaft forging, and its steps are:

[0063] (1) Prepare the quenching liquid, the composition and mass parts of the quenching liquid are: polypropylene grafted glycidyl methacrylate (referred to as PP-g-GAM, purchased from Hangzhou Tuomu Technology Co., Ltd.) and polyacrylamide mixture 12 parts (the mass ratio of polypropylene-methacrylic acid to polyacrylamide is 1:1), 2 parts of random copolymer of ethylene oxide and propylene oxide (average molecular weight is 30000), polyamide polyethylene glycol 4 Part, 0.6 part of defoamer (polyether, average molecular weight is 7000), 3 parts of water, 5 parts of dispersant polydimethylsiloxane;

[0064] (2) Heat a large shaft forging (5 meters in length, 400mm in diameter, with 3 grooves and 2 through holes on the shaft forging) to above 990°C, and then keep it warm for 2 hours;

[0065] (3) quenching by immer...

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Abstract

The invention discloses a method for quenching a large-size forged shaft piece, and belongs to the technical field of thermal treatment quenching. The method is mainly applicable to quenching of large-size 35CrMo steel forged shaft pieces. A quenching liquid used for quenching consists of a mixture of polypropylene-methacrylic acid and polyacrylamide, a random copolymer of ethylene oxide and propylene epoxide, polyamide polyethylene glycol, a defoaming agent and water. The method is simple in process, the conventional double-liquid / three-liquid quenching process is changed, the large-size 35CrMo steel forged shaft pieces are effectively prevented from being cracked when being quenched, the quenching effect is good, the defects that the large-size 35CrMo steel forged shaft pieces are insufficient in hardness, not uniform in internal tissue form, easy to crack and the like when being quenched by using ordinary rapid quenching oil are overcome.

Description

technical field [0001] The invention belongs to the technical field of heat treatment and quenching, and more specifically relates to a quenching method for a large shaft forging. Background technique [0002] The earliest historical records of the quenching process can be found in the "Clear Water Quenching its Peak" in "Han Shu·Wang Bao Biography". In 1863, a British metallographer and geologist showed six different metallographic structures of steel under a microscope, proving that when steel is heated and cooled, the internal structure will change, and the phase at high temperature in the steel will transform when it is quenched as a harder phase. Therefore, metals usually use heat treatment to improve the strength and metallographic structure of the metal to obtain the desired properties, and the quenching medium is one of the key factors to obtain high quenching quality. Commonly used quenching mediums include brine, water , mineral oil, air, etc. The traditional wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D1/60C21D9/28
CPCC21D1/18C21D1/60C21D9/28
Inventor 郑益刘凌赵慧李海岩
Owner 马鞍山金泉工业介质科技有限公司