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Uniform-speed cooling medium and application thereof in cooling control process after forging

A technology of cooling medium and controlled cooling, which is applied in the field of post-forging cooling of steel forgings, forging and heat treatment of steel forgings, and can solve the problems of difficult promotion of dry cutting technology, anisotropy of mechanical properties, poor low-temperature impact performance, etc. Tissue uniformity, ensuring hardness uniformity, and reducing burns

Active Publication Date: 2014-05-14
NANJING KERUN LUBRICANTS +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0018] Purpose of the invention: To provide a uniform cooling medium for controlling post-forging cooling and a compatible process method, improve metallurgy and forging genetic structure, and solve problems such as anisotropy of mechanical properties, poor low-temperature impact performance, large heat treatment deformation, and difficult promotion of dry cutting technology. Technical problems in the development of machinery industry
[0019] Technical solution: the principle of the invention, to solve the problem of banded segregation, the problem of high temperature diffusion in the two-phase region must be fundamentally solved first

Method used

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  • Uniform-speed cooling medium and application thereof in cooling control process after forging
  • Uniform-speed cooling medium and application thereof in cooling control process after forging
  • Uniform-speed cooling medium and application thereof in cooling control process after forging

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example 1

[0051] Example 1: 20CrMnTi rear axle passive tooth blanks, outer diameter 480mm, effective thickness about 50mm, 10 pieces were selected for controlled cooling after forging, directly put into 25% uniform cooling medium after forging for immersion cooling, and compared with the traditional air cooling method. The final forging temperature is about 980°C, and the infrared instrument is used to judge the outlet temperature. The outlet temperature is controlled at 500-600°C, and then transferred to a 640°C soaking furnace for 2 hours of soaking time, and finally air-cooled to room temperature. The stock solution of uniform cooling medium is prepared according to the following formula: polyvinylpyrrolidone accounts for 8%, sodium carboxymethylcellulose (CMC) accounts for 5%, triethanolamine 3% (rust inhibitor), high carbon alcohol defoamer 1 %, 1% isothiazolinone (fungicide), and the rest is water, of which polyvinylpyrrolidone has a molecular weight of 150,000-200,000. The unifor...

example 2

[0055] Example 2: 45# steel front axle (see Figure 7 ), the effective thickness of the fist part is about 100mm, and the effective thickness of the I-beam part is 20-30mm. The traditional method is to cool by air cooling or air cooling after forging, and then perform quenching and tempering treatment (quenching and high temperature tempering). After quenching and tempering treatment, subcutaneous 10mm tissue requires grade 1-4 (testing standard GB / T13320), but traditional methods have always had genetic tissue problems such as Widmanstattenite and reticulated ferrite, and the subsequent heat treatment process cannot be adjusted from Fundamentally solve the problem of unqualified organizations, generally controlled at 4-5 levels.

[0056] After the front axle is forged, it is immersed in 20% uniform cooling medium, and the infrared meter is used to judge the liquid temperature. The temperature of the liquid is controlled at 100-200 ° C, and then air-cooled to room temperature....

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Abstract

The invention relates to a method for controlling cooling after a forging steel part is forged, and belongs to the field of steel forging and heat treatment. The method is characterized in that a forged workpiece is immerged into a uniform-speed cooling medium for cooling; a cooling process takes the fact that a non-equilibrium state structure is not generated on a surface as a principle and can adopt a cooling mode of cooling to proper temperature and then equalizing the temperature or other cooling modes according to the size of a material and a workpiece. The method for controlling cooling after forging, which is disclosed by the invention, can solve the problems of rough and large structure, hereditary structures, such as a banded structure, and structure nonuniformity of the traditional forging stock, ensure the rigidity uniformity of the forging stock, impulse the popularization of a dry cutting technology, improve the mechanical properties, namely anisotropy, impact ductility and the like of a product which is subjected to heat treatment, improve the uniformity of a structure which is not subjected to the heat treatment and effectively cooperate with the heat treatment deformation control.

Description

technical field [0001] The invention relates to the field of forging and heat treatment of steel forgings, in particular to the field of cooling after forging of steel forgings. Background technique [0002] Casting, forging, and heat treatment are three thermal processing processes with high energy consumption and high pollution. There is a close and complementary relationship between the three. However, there is an obvious separation problem among the three in the domestic machinery industry, and effective cooperation cannot be carried out. It can be simply understood that there is an inevitable connection between cooling after casting, cooling after forging and quenching cooling. Through effective cooperation, the subsequent heat treatment process, such as annealing, normalizing, etc., can be greatly reduced, and the energy consumption of heat treatment can be reduced. [0003] At present, the main problems that plague heat treatment are insufficient mechanical properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/84C21D1/60
Inventor 聂晓霖左永平
Owner NANJING KERUN LUBRICANTS
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