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Steel plate quenching cooling method and device

A technology of cooling equipment and cooling method, applied in the direction of quenching device, heat treatment equipment, furnace type, etc., can solve the problems of the difference in cooling intensity between the upper and lower plates, and the steam film cannot be discharged smoothly, and achieve the effect of reducing the time difference

Active Publication Date: 2014-03-19
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can quickly and conveniently immerse the steel plate into the liquid at an inclined angle, which solves the problem that a large amount of steam film on the lower surface of the steel plate cannot be smoothly discharged after the steel plate is placed horizontally and immersed in the liquid, resulting in a large difference in cooling strength between the upper and lower plate surfaces, and at the same time reduces the The time difference between the first immersion side and the second immersion side of the steel plate vertically immersed in the liquid

Method used

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  • Steel plate quenching cooling method and device
  • Steel plate quenching cooling method and device
  • Steel plate quenching cooling method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The product to be processed in this example is a low-carbon alloy steel plate with a length of 10000 mm, a width of 5000 mm and a thickness of 200 mm. It is required to obtain martensite, lower bainite and a small amount of retained austenite along the entire cross-section after quenching and cooling, and at the same time, it is required to control the distortion Control within a certain range.

[0036] In order to avoid cracking during the quenching process, the water-air alternate time-controlled quenching and cooling process is adopted, that is, the process of water quenching + air cooling + water quenching + air cooling + ... is carried out under the premise of strict control of time.

[0037] The steel plate quenching cooling equipment structure that present embodiment adopts is as follows figure 1As shown, it consists of a lifting drive device 1, a quenched steel plate 2, a material rack 3, a rotating shaft 4, a water discharge gate 5, a gate guide frame 6, an inn...

Embodiment 2

[0049] The product object processed in this example is a low-carbon steel plate with a length of 12000mm, a width of 3500mm, and a thickness of 150mm. It is required that the mechanical properties along the entire section after quenching and cooling be higher than the set value, and the amount of distortion must be controlled within a certain range.

[0050] Since the material of the quenched steel plate is low-carbon steel, cracking will not occur even under high cooling intensity, so the entire quenching and cooling process is completed by one-time immersion and liquid discharge.

[0051] The steel plate quenching cooling equipment structure that present embodiment adopts is as follows figure 1 As shown, it is the same as in Embodiment 1, consisting of a lifting drive device 1, a quenched steel plate 2, a rack 3, a rotating shaft 4, a water discharge gate 5, a gate guide frame 6, an inner tank body 7, an outer tank body 8, and a water injection pipe for the inner tank Road 9...

Embodiment 3

[0057] The product to be processed in this example is P20 plastic mold steel with a length of 7000 mm, a width of 2000 mm and a thickness of 500 mm. It is required to obtain martensite, lower bainite and a small amount of retained austenite along the entire cross-section after quenching and cooling.

[0058] In order to avoid cracking during the quenching process, the water-air alternate time-controlled quenching and cooling process is adopted, that is, the process of water quenching + air cooling + water quenching + air cooling + ... under the premise of strict control of time.

[0059] The steel plate quenching cooling equipment structure that present embodiment adopts is as follows figure 1 As shown, it is the same as in Embodiment 1, consisting of a lifting drive device 1, a quenched steel plate 2, a rack 3, a rotating shaft 4, a water discharge gate 5, a gate guide frame 6, an inner tank body 7, an outer tank body 8, and a water injection pipe for the inner tank Road 9, p...

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Abstract

The invention provides a steel plate quenching cooling method and device. The method comprises the following steps of: placing a steel plate on a material rack above a quenching tank in a way of enabling the plate surface of the steel plate to be parallel to the liquid level, downwards rotating the material rack to a certain angle by taking one side of the material rack in the length direction as a rotating shaft under the drive of a driving device to partially immerse the steel plate into liquid, simultaneously injecting the liquid into the quenching tank to enable the liquid level of the liquid in the quenching tank to rise till the steel plate is completely immersed, and further realizing oblique quenching cooling of the steel plate. The steel plate quenching cooling device comprises a quenching steel plate oblique liquid immersion and liquid outlet system, a system for water injection from an outer tank body into an inner tank body and a rapid water drainage system. According to the method and the device, disclosed by the invention, the steel plate can be immersed into the liquid with a certain inclination angle quickly and conveniently, the problem of great difference of cooling intensity between the upper plate surface and the lower plate surface caused by incapability of smoothly exhausting a large quantity of steam film on the lower surface of the steel plate after the steel plate is horizontally placed and immersed into the liquid can be solved, and the time difference between one side which is firstly immersed into the liquid and the side which is later immersed into the liquid when the steel plate is immersed into the liquid in a vertical way can be simultaneously reduced.

Description

technical field [0001] The invention relates to the field of heat treatment quenching and cooling, in particular to a steel plate quenching and cooling method and corresponding equipment. Background technique [0002] Heat treatment refers to the process of cooling the steel in the austenitic state at an appropriate speed to obtain the expected structure and properties. In addition to the changes in the structure and properties of steel during quenching and cooling, it is also accompanied by cracking and distortion. If the steel is cracked during quenching, it will be scrapped. Quenching cracking can be avoided through appropriate processes and quenching methods; quenching distortion refers to the change of the original size or shape of the workpiece during quenching and cooling, no matter what measures are taken (change heating Quenching distortion cannot be avoided due to the cooling process, clamping method, quenching medium type, and quenching method, but the difference...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D1/63C21D9/00
Inventor 陈乃录戎咏华左训伟贾晓帅
Owner SHANGHAI JIAOTONG UNIV
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