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Heat treatment method of 9cr2mo straightening roll based on exhaust quenching process

A heat treatment method and technology for straightening rolls, applied in the field of straightening roll processing, can solve the problems of contradiction between processing procedures and processing effects, difficult to effectively avoid the influence of quenching medium, influence of tempering temperature, etc., to achieve good toughness, improved hardness, The effect of reducing quenching deformation

Active Publication Date: 2017-10-13
马鞍山市恒泰重工机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal filling will affect the tempering temperature during tempering, and the filling needs to be removed before tempering, and the process is cumbersome
However, if no filler is added, it is difficult to effectively avoid the influence of the quenching medium on the quenching effect, resulting in a contradiction between the processing procedure and the processing effect.

Method used

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  • Heat treatment method of 9cr2mo straightening roll based on exhaust quenching process
  • Heat treatment method of 9cr2mo straightening roll based on exhaust quenching process
  • Heat treatment method of 9cr2mo straightening roll based on exhaust quenching process

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Effect test

Embodiment 1

[0040] A heat treatment method for 9Cr2Mo straightening rollers based on the exhaust quenching process in this embodiment, the components contained in the 9Cr2Mo straightening rollers and their weight percentages are: C: 0.85%, Si: 0.23%, Mn: 0.28%, Cr : 2.1%, Mo: 0.40%, P≤0.02, S≤0.02, and the rest are iron and unavoidable impurities. The material is heat treated after forging and machining, and quenching protection is carried out by quenching tooling during the heat treatment process.

[0041] combine figure 2 , the quenching frock used in this embodiment includes a boom 9, a lower platen 2, an upper platen 4 and an inflation ring 5, the lower end of the boom 9 is connected with a baffle plate 1, and the lower end of the boom 9 is covered with a lower platen 2. When in use, Both sides of the lower platen are filled with high-temperature cotton 6 for sealing. The upper part of the suspender 9 is provided with external threads, the upper platen 4 and the inflation ring 5 ar...

Embodiment 2

[0063] In this embodiment, the radius difference between the upper platen 4, the lower platen 2, and the suspender 9 is controlled to be 1-5 mm, which is helpful for the sealing and filling of the high-temperature cotton. If the gap is too large, the high-temperature cotton is difficult to fill tightly, and the sealing effect is not good. ideal. In this embodiment, the radius difference is selected as 2 mm. The diameters of the lower pressing plate 2 and the upper pressing plate 4 are not less than 0.8 times of the diameter of the end face of the roll body 3, so as to be able to form protection for the end face of the roll body.

Embodiment 3

[0065] In this embodiment, bayonets 8 are provided on the side wall of the compression nut 7 , and the bayonets 8 are symmetrically distributed along the radial direction of the compression nut 7 . After the roller body 3 is heated, workers cannot approach it, so they can clamp the bayonet 8 by means of calipers, thereby rotating the compression nut 7 . Therefore, in step a and step c of the exhaust process, a caliper or other device can be used to snap into the bayonet 8 so as to rotate and loosen the compression nut 7 . Other structures can also be provided to assist the rotation of the compression nut 7, such as protruding blocks, slots, etc., without specific limitations.

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Abstract

The invention discloses a 9Cr2Mo straightening roll heat treatment method based on an exhausting and quenching process and belongs to the field of straightening roll processing. The 9Cr2Mo straightening roll heat treatment method comprises the following steps: sealing the central hole and the end surfaces of a roll body with a quenching tool, and arranging an expansion ring between an upper pressing plate and a clamp nut to form effective sealing; during quenching treatment, first preheating the roll body, then exhausting high-temperature gas from the central hole, and next, heating the roll body; and during quenching, first performing repeated lifting water quenching, then immersing the roll body in oil to cool the roll body, and finally performing tempering repeatedly. According to the 9Cr2Mo straightening roll heat treatment method, negative pressure is generated in the central holes of the roll body, so that a quenching medium cannot enter the end surfaces and the central hole; and after being quenched, the roll body has high external hardness and good internal toughness, so that cracks are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of straightening roll processing, and more specifically relates to a heat treatment method for 9Cr2Mo straightening rolls based on an exhaust quenching process. Background technique [0002] Straightening machine is a mechanical equipment for straightening profiles and bars, and its straightening roller is the key component. For large straightening rolls, the diameter is large, the outer surface requires higher hardness, and the core needs to maintain good toughness. Therefore, how to heat-treat straightening rolls has become a key technology in production and processing. [0003] For current straightening rolls, regardless of the size of the roll diameter, in order to improve their comprehensive performance, overall quenching is required. For different materials and specific applications of straightening rollers, water quenching or oil quenching will be selected appropriately. For oil quenching, it is not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/38C21D1/18C21D1/70C22C38/18C22C38/02C22C38/04C22C38/12
CPCC21D1/18C21D1/70C21D9/38C21D2221/10C22C38/02C22C38/04C22C38/12C22C38/18
Inventor 陈道龙丁一宏赵龙申周骏立
Owner 马鞍山市恒泰重工机械有限公司
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