Method for preventing end-face spray quenching cracking of quenching piece by changing spray angle

A spray angle, quenching and cracking technology, applied in the direction of quenching agent, quenching device, furnace type, etc., can solve the problems of easy peeling, limited use, inability to use large-sized quenched parts, etc., to achieve simple implementation, slow cooling strength, The effect of increasing infiltration time and area

Inactive Publication Date: 2007-08-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cladding material used in this invention to prevent quenching and cracking is a disposable coating material, which cannot be applied to large-sized quenched parts, because the end face area of ​​large-sized quenched parts is large, and the material to be coated is long-term. During the heating process of time and the transfer process of quenched parts, it is easy to peel off, especially at the corners, so the use in actual production is limited

Method used

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  • Method for preventing end-face spray quenching cracking of quenching piece by changing spray angle

Examples

Experimental program
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Effect test

Embodiment 1

[0016] There is an alloy steel forging, size: length 6000mm×width 1500mm×thickness 500mm, after forging, cut the end face of width 1500mm×thickness 500mm with electric saw, then heat to austenitizing temperature, put the forging on a quenching workbench spray quenching treatment. The quenching medium used is water. The structure of the equipment is to set densely arranged water pipes 1 on both sides of the quenching area, and to install nozzles 2 in the direction where the water pipes 1 face the quenching area. The quenching parts are placed between the densely arranged water pipes 1 on both sides. (Right) The side 4 is parallel to the water pipe 1, the end surface 3 of the quenching part is perpendicular to the water pipe 1, the direction of the nozzle 2 is at an angle a to the water pipe 1, a is between greater than 0° and less than 90°, and the nozzle 2 sprays out The medium and the end face 3 of the quenched part form an angle of 90°-a. The specific working process is: t...

Embodiment 2

[0018] Shafts made of carbon steel, size: Φ500mm×6000mm, after being heated to the austenitizing temperature, hang the shaft horizontally in the quenching area of ​​the quenching equipment, and the quenching process is a combination of spraying, immersion and air cooling Quenching, the quenching medium is a water-soluble quenching medium. The structure of the liquid spray quenching equipment is as follows: densely arranged water pipes 1 and nozzles 2 at an angle a to the water pipes 1 are arranged on both sides of the quenching area in the length direction, and a is between greater than 0° and less than 90°. The specific working process is: the quenching medium flows through the water pipe 1 and is sprayed from the nozzle 2 at an angle a to the water pipe 1 to the left (right) side 4 of the quenching piece and the upper (lower) side 5 of the quenching piece, and the nozzle 2 is sprayed The quenching medium and the end face 3 of the quenching piece are at an angle of 90°-a. As ...

Embodiment 3

[0020] The quenching object is an alloy steel forging, size: length 5000mm×width 2000mm×thickness 300mm, after forging, cut the two end faces of width 2000mm×thickness 300mm with an electric saw, then heat to the austenitizing temperature, hang the forging on the quenching In the quenching area of ​​the equipment, the quenching process is a combination of liquid spray and air cooling, and the quenching medium is water. The water pipe 1 and the nozzle 2 at an angle a to the water pipe are arranged at the corresponding positions of the left (right) side 4 of the quenching piece and the upper (lower) side 5 of the quenching piece, and a is between greater than 0° and less than 90°. The specific working process is: the quenching medium flows through the water pipe 1 and is sprayed from the nozzle 2 at an angle a to the water pipe 1 to the left (right) side 4 of the quenching piece and the upper (lower) side 5 of the quenching piece, and the nozzle 2 is sprayed The quenching medium...

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Abstract

The invention discloses an end-face spray quenching crack-preventing method of quenching piece through changing spraying angle in the heat disposal domain of metal material, which is characterized by the following: placing quenching piece in the quenching equipment with pipe; making quenching piece with lateral and end faces; setting lateral face as rapid freezing face only; paralleling lateral face and pipe; setting the end face of quenching piece perpendicular to pipe; flowing quenching dielectric through pipe; displaying angle a (0-90 deg) for pipe and lateral face of quenching piece; fitting for cooling lateral face of quenching piece; avoiding crack effectively.

Description

technical field [0001] The invention relates to a method in the technical field of heat treatment of metal materials, in particular to a method for changing the spraying angle to prevent the cracking of the end surface of a quenched part by liquid spraying. Background technique [0002] Quenching refers to heating the steel part to A C3 or A C1 A certain temperature above the point, keep it for a certain time, and then cool at an appropriate speed to obtain the heat treatment process of the desired structure. Due to the large size of the quenched part and the large heat capacity of the quenched part, it must have a sufficiently large cooling rate during quenching and cooling, resulting in a large temperature difference between the surface and the core during the cooling process and the asynchronous transformation of the structure, making the quenched part A large internal stress is generated, which increases the risk of cracking. In order to obtain the expected structure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/667C21D9/00C21D11/00C21D1/56C21D1/60
Inventor 潘健生张伟民陈乃录曹福顺李强左训伟徐骏
Owner SHANGHAI JIAO TONG UNIV
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