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Double quenching technique for 9Cr2Mo leveler roll

A process method, double-liquid quenching technology, applied in the direction of manufacturing tools, heat treatment process control, furnace, etc., can solve problems such as difficult simultaneous guarantee, intense cooling, and difficulty in achieving the hardness of the roll body

Inactive Publication Date: 2008-03-05
CITIC HEAVY INDUSTRIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The straightening roll needs overall quenching, the hardness of the roll body is above HRC54, and the toughness of the core is guaranteed, but the following problems exist in the quenching process: 1) Due to the large cross-section, the hardness of the roll body is difficult to reach HRC54 during oil quenching; For this kind of material, the cooling is too intense and it is easy to crack; 2) The hardness of the roll body is required to be greater than HRC54, so the quenching deformation should be controlled according to the amount of grinding, which is more difficult for such a large piece; 3) The hardness of the roll body should reach HRC54 or more , in order to ensure the toughness of the core and subsequent machining, the hardness requirements of the end face and the core are reduced to HRC35-40, which is not easy to ensure at the same time during overall quenching; 4) The edge of the straightening roller is easy to overheat when heated, and easy to crack when quenched

Method used

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  • Double quenching technique for 9Cr2Mo leveler roll

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Embodiment Construction

[0013] As shown in Figure 1, the two-liquid quenching process method of described a kind of 9Cr2Mo straightening roller, its concrete process is:

[0014] 1. Lift the roller body (3) of the straightening roller through the sling (1), the roller body (3) and the sling (1) are equipped with compacted loess (4), and the roller body (3) of the straightening roller ) The upper end is equipped with a cover plate (2), and then hoisted into the 105KW well-type electric furnace.

[0015] 2. Heat up to 840±10°C with the furnace and keep warm for 3.5 hours.

[0016] 3. After coming out of the oven, quickly lift the straightening roller to the sky above the water tank, pre-cool it in the air for 2 minutes, and then use a Φ24mm leather tube to pour water on the surface of the roller cover to make it fully pre-cooled. Stop watering after the top edge of the cover plate and rollers turn black, and water again after the temperature rises, repeat this 2-3 times, and at the same time, the lowe...

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Abstract

The double liquid quenching process of 9Cr2Mo straightening roller includes the first quick cooling in water to avoid high temperature decomposition of overcooling austenite to the martensite transformation temperature, and the subsequent cooling in oil for martensite transformation to raise the hardness, reduce quenching deformation and avoid cracking. Before being loaded to furnace, the straightening roller has its end surfaces and central through hole covered with plates to reduce the quench cooling of these parts and ensure hardness of HRC 35-40.

Description

Technical field: [0001] The invention relates to the technical field of production and manufacture of bar straightening machines, in particular to a two-liquid quenching process for 9Cr2Mo straightening rollers. Background technique: [0002] At present, in the production and manufacturing process of the bar straightening machine, the straightening roller whose material is 9Cr2Mo is the key component, and the heat treatment process of the straightening roller is complicated and difficult, and has become the key to production. The straightening roll needs overall quenching, the hardness of the roll body is above HRC54, and the toughness of the core is guaranteed, but the following problems exist in the quenching process: 1) Due to the large cross-section, the hardness of the roll body is difficult to reach HRC54 during oil quenching; For this kind of material, the cooling is too intense and it is easy to crack; 2) The hardness of the roll body is required to be greater than H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/38C21D1/18C21D11/00
Inventor 于文平李德福邵文华尤明张峰姜长春李圣聂新林陈艳芳于慎君
Owner CITIC HEAVY INDUSTRIES CO LTD
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