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Thermal treatment method for casting waste heat of high-speed steel roller

A heat treatment method and high-speed steel technology, applied in the field of metallurgy, can solve the problems of polluting the environment, using a large amount of energy, and high energy consumption, and achieve the effects of high hardness, excellent performance and cost reduction.

Inactive Publication Date: 2019-04-19
江苏凯达重工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current traditional heat treatment process often consumes a lot of energy, and also uses a large amount of cooling water and quenching agent, which pollutes the environment. Therefore, it is necessary to design a heat treatment method that does not use cooling water and quenching agent and saves energy.

Method used

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  • Thermal treatment method for casting waste heat of high-speed steel roller

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this embodiment, a high-speed steel roll with a diameter of 380 mm and a length of 650 mm is centrifugally cast. The unpacking time is calculated according to the formula: T=1.3×3.8=4.94 hours, and the actual unpacking time is 5 hours and 3 minutes. The surface temperature of the roll is 803°C, and there is no casting defect in the surface inspection. The high-temperature roll out of the box is quickly moved into the box-type trolley resistance furnace for 6 hours, and then the temperature is quickly raised to 1050°C at a heating rate of 80°C / h. After 8 hours of heat preservation, The hardness of the roll is 83-85HSD according to the process requirements. The tempering temperature determined according to the process requirements is 530±5°C for tempering treatment. The holding time is 48 hours. After cooling out of the furnace, the hardness test is 84HSD. Meet the process requirements.

[0018] Compared with the traditional heat treatment power consumption of high-spe...

Embodiment 2

[0020] In this embodiment, when a high-speed steel roll with a diameter of 500 mm and a length of 1500 mm is centrifugally cast, the unpacking time is calculated according to the formula: T=1.2×5=6 hours, and the actual unpacking time is 6 hours and 20 minutes for unpacking. The surface temperature of the roll is 828°C, and there is no casting defect in the surface inspection. The high-temperature roll out of the box is quickly moved into the box-type trolley resistance furnace for 7 hours, and then the temperature is rapidly raised to 1060°C at a heating rate of 70°C / h. After 7 hours of heat preservation, The hardness of the roll is 85-88HSD according to the process requirements. The tempering temperature determined according to the process requirements is 505±5°C for tempering treatment. The holding time is 58 hours. After cooling out of the furnace, the hardness test is 86HSD. Meet the process requirements.

[0021] Compared with the traditional heat treatment power consump...

Embodiment 3

[0023] When centrifugally casting a high-speed steel roll with a diameter of 700mm and a length of 1700mm, the unpacking time is calculated according to the formula: T=1.4×7=9.8 hours, the actual unpacking time is 9 hours and 30 minutes, and the surface temperature of the rolled roll is The temperature is 842°C, and there is no casting defect in the surface inspection. The high-temperature roll out of the box is quickly moved into the box-type trolley resistance furnace for 8 hours, and then the temperature is rapidly raised to 1080°C at a heating rate of 50°C / h. After 6 hours of heat preservation, it is blown out and quenched To 450°C, the hardness of the roll required by the process is 83-85HSD, the tempering temperature determined according to the process requirements is 540±5°C for tempering treatment, the holding time is 60 hours, and the hardness test is 85HSD after cooling out of the furnace, which meets the process requirements .

[0024] Compared with the traditional ...

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Abstract

The invention discloses a thermal treatment method for casting waste heat of a high-speed steel roller, comprising the following steps of: S1: unpacking, after centrifugal casting is completed, the high-speed steel roller is crystallized, solidified and cooled in a casting mold, and then the roller is unpacked according to the unpacking time calculated by a formula; the formula is Time = unpackingcoefficient * diameter of the roller casting, unit: time - h, diameter - dm; S2: quenching, the high-speed steel roller resistance furnace is evenly heated for a period of time, the temperature is rapidly increased, then the temperature is kept; and then the furnace is cooled by air; S3: tempering. According to the invention, the unpacking time is calculated by the formula obtained through a large number of tests; compared with the traditional cold unpacking roller, the energy saving in the thermal treatment link can be more than 50%, the thermal treatment cycle and the manufacturing cost ofthe roller are shortened, the roller obtained through treatment has high hardness, fine crystal grains, no carbide aggregation and growth phenomenon, excellent performance; and the energy and time consumption in the thermal treatment link are greatly reduced.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a high-speed steel roll casting waste heat heat treatment method. Background technique [0002] Traditional heat treatment is a metal thermal processing process that puts metal materials in some kind of heating equipment, heats them in a certain medium, heats them up, cools them down, and changes their properties by changing the surface or internal crystal structure of the material. The current traditional heat treatment process often consumes a lot of energy, and also uses a large amount of cooling water and quenching agent, which pollutes the environment. Therefore, it is necessary to design a heat treatment method that does not use cooling water and quenching agent and saves energy. Contents of the invention [0003] The object of the present invention is to provide a high-speed steel roll casting waste heat heat treatment method. [0004] The technical solution for realizing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/613C21D9/38
CPCC21D1/18C21D1/613C21D9/38
Inventor 许健钱百能许云鹏
Owner 江苏凯达重工股份有限公司
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