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Smithing exhaust heat quenching process for caterpillar track node with node pitch more than 200mm

A technology of forging waste heat quenching and waste heat quenching, which is applied in the field of heat treatment technology, can solve the problems of inability to meet the performance requirements of chain links, coarse grains, and thickening of thickness.

Active Publication Date: 2008-12-03
南京汽车锻造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no domestic manufacturer using the second process to complete the heat treatment of chain rail joints with a pitch greater than 200mm. Because the pitch is large, the volume of the forging will increase and the thickness will become thicker. Although it can be hardened through the second process, the hardness of the metallographic It can also meet the requirements, but the crystal grains are coarse, below grade 3, which cannot meet the performance requirements of the chain link

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A chain rail link with a pitch of 203mm is produced by hot die forging. The billet is heated to a temperature of 1130°C and the billet is made. The deformation is 24%. For quenching, the whole process from heating the blank to 1130°C to entering the quenching medium for quenching takes 48 seconds. The temperature of the forging when it exits the quenching medium is 58°C, and the forging stays in the quenching tank for 105 seconds. The high temperature maximum cooling rate V of the quenching medium used in this embodiment above 600°C max =150°C / s, the low-temperature cooling rate at 300°C V=65°C / s, the temperature of the medium during quenching is less than 45°C, and the forging is tempered 15 hours after quenching to measure δ b =1160Mpa, δ 0.2 =1060Mpa, the grain size is grade 6, and the hardness is HRC52, fully meeting the design requirements of forgings.

Embodiment 2

[0016] A chain rail link with a pitch of 216mm is produced by hot die forging. The billet is heated to a temperature of 1180°C and then made into a billet with a deformation of 27%. For quenching, the whole process from heating the billet to 1160°C to entering the quenching medium for quenching takes 53 seconds. The temperature of the forging when it exits the quenching medium is 58°C, and the forging stays in the quenching tank for 110 seconds. The high temperature maximum cooling rate V of the quenching medium used in this embodiment above 600°C max =145°C / s, the low-temperature cooling rate at 300°C V=75°C / s, the temperature of the medium during the quenching process is less than 50°C, and the forging is measured after tempering within 22 hours after quenching b =1150Mpa, δ 0.2 =1050Mpa, the grain size is grade 6, and the hardness is HRC51, fully meeting the design requirements of forgings.

Embodiment 3

[0018] A chain rail link with a pitch of 228mm is produced by hot die forging. The billet is heated to a temperature of 1160°C and then made into a billet with a deformation of 25%. For quenching, the whole process from heating the billet to 1160°C to entering the quenching medium for quenching takes 55 seconds. The temperature of the forging when it exits the quenching medium is 57°C, and the forging stays in the quenching tank for 120 seconds. The high temperature maximum cooling rate V of the quenching medium used in this embodiment above 600°C max =150°C / s, the low-temperature cooling rate at 300°C V=75°C / s, the temperature of the medium during quenching is less than 55°C, and the forging is measured after tempering within 8 hours after quenching b =1140Mpa, δ 0.2 =1040Mpa, the grain size is grade 5, and the hardness is HRC52, fully meeting the design requirements of forgings.

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PUM

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Abstract

The invention relates to a heat treatment process, in particular to a track link forging-remnant-heat quenching process, the pitch of which is more than 200mm. The process comprises a stock heating working procedure, a performing working procedure, a dummying working procedure, a finish forging working procedure and a trimming and piercing working procedure, and also comprises a remnant-heat quenching working procedure and a tempering working procedure; wherein, the remnant-heat quenching temperature ranges from 890 to 950 DEG C, the temperature of a forgeable piece ranges from 50 to 60 DEG C when being taken out of a quenching medium, and the quenching time is 100 to 120 seconds; the tempering working procedure is executed within 24 hours after the forgeable piece is quenched, and the tempering temperature ranges from 420 to 480 DEG C in the quenching working procedure. The track link forging-remnant-heat quenching process has the advantages that the forging technology and the heat treatment process are combined together, and the functions of the deformation strengthening and the heat treatment strengthening are exerted at the same time, thereby achieving the comprehensive mechanical property which a single strengthening method cannot realize.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a residual heat quenching process for forging chain rail links with a pitch of more than 200 mm. Background technique [0002] The chain rail link is the core component of the track, widely used in construction machinery and military products, such as excavators, bulldozers, tanks, self-propelled artillery, etc., the working conditions are harsh and used in chains, and the reliability requirements are very high. At present, hot die forging is mainly used way of production. The post-forging heat treatment of this product is a key process that determines the comprehensive mechanical properties of the product. There are two main heat treatment processes used by domestic manufacturers: one is conventional quenching and tempering treatment, reheating the cooled product after forging to 840-860 ° C, After holding for a certain period of time, enter the medium for quenching. After quenching,...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/18B21J5/00
CPCY02P10/20
Inventor 成功周永南张丽程坚朱德嵩张进王文祥刘德群
Owner 南京汽车锻造有限公司