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Heat treatment method of roll shaft

A heat treatment method and roller shaft technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of poor ultrasonic flaw detection, poor mechanical properties, coarse grains, etc., and meet the requirements of no cracking, reduced deformation and cracking, and small transformation Effect

Pending Publication Date: 2021-11-19
南京联银重型机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the heat treatment of existing roller shafts, oil cooling or water cooling is generally used, and problems such as coarse grains, mixed crystals, and poor ultrasonic flaw detection often occur after forging, and the mechanical properties are poor.

Method used

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  • Heat treatment method of roll shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to an embodiment of the present invention combined with figure 1 show. A heat treatment method for a roller, comprising the steps of:

[0019] (1) Put the roller shaft into a heat treatment furnace, raise the temperature to 660°C, and keep it warm for 2 hours;

[0020] (2) Raise the furnace temperature to 925°C at a heating rate of 100°C / h and keep it warm for 2 hours;

[0021] (3) Alternately put the roller shaft into brine and air for water cooling and air cooling, and finally put it into quenching oil for oil cooling, so that the temperature of the roller shaft is reduced to 220 ° C, and keep warm for 2 hours;

[0022] (4) Raise the furnace temperature to 660°C at a heating rate of 50°C / h and keep it warm for 2 hours; then raise the furnace temperature to 865°C at a heating rate of 100°C / h and keep it warm for 2 hours;

[0023] (5) Alternately put the roller shaft into brine and air again for water cooling and air cooling, and finally put it into quenchi...

Embodiment 2

[0032] A heat treatment method for a roller, comprising the steps of:

[0033] (1) Put the roller shaft into a heat treatment furnace, raise the temperature to 665°C, and keep it warm for 2.5 hours;

[0034] (2) Raise the furnace temperature to 930°C at a heating rate of 100°C / h and keep it warm for 3 hours;

[0035] (3) Alternately put the roller shaft into brine and air for water cooling and air cooling, and finally put it into quenching oil for oil cooling, so that the temperature of the roller shaft is reduced to 225°C and kept for 2.5 hours;

[0036] (4) Raise the furnace temperature to 665°C at a heating rate of 50°C / h and keep it warm for 2.5 hours; then raise the furnace temperature to 870°C at a heating rate of 100°C / h and keep it warm for 3 hours;

[0037] (5) Alternately put the roller shaft into salt water and air again for water cooling and air cooling, and finally put it into quenching oil for oil cooling, so that the temperature of the roller shaft is reduced t...

Embodiment 3

[0046] A heat treatment method for a roller, comprising the steps of:

[0047] (1) Put the roller shaft in a heat treatment furnace, raise the temperature to 670°C, and keep it warm for 3 hours;

[0048] (2) Raise the furnace temperature to 935°C at a heating rate of 100°C / h and keep it warm for 4 hours;

[0049] (3) Alternately put the roller shaft into brine and air for water cooling and air cooling, and finally put it into quenching oil for oil cooling to reduce the temperature of the roller shaft to 230°C and keep it warm for 3 hours;

[0050] (4) Raise the furnace temperature to 670°C at a heating rate of 50°C / h and keep it warm for 3 hours; then raise the furnace temperature to 875°C at a heating rate of 100°C / h and keep it warm for 4 hours;

[0051] (5) Alternately put the roller shaft into brine and air again for water cooling and air cooling, and finally put it into quenching oil for oil cooling, so that the temperature of the roller shaft is reduced to 220°C and kep...

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Abstract

The invention provides a heat treatment method of a roll shaft. The heat treatment method comprises the following steps of heating the roll shaft to 660-670 DEG C, and keeping the temperature for 2-3 hours; raising the furnace temperature to 925-935 DEG C, and keeping the temperature for 2-4 hours; alternately carrying out water cooling and air cooling on the roll shaft, finally conducting oil cooling, reducing the temperature of the roll shaft to 220-230 DEG C, and keeping the temperature for 2-3 hours; raising the furnace temperature to 660-670 DEG C, and keeping the temperature for 2-3 hours; raising the furnace temperature to 865-875 DEG C, and keeping the temperature for 2-4 hours; alternately carrying out water cooling and air cooling on the roll shaft again, finally carrying out oil cooling, enabling the temperature of the roll shaft to be reduced to 200-220 DEG C, and keeping the temperature for 2-3 hours; raising the furnace temperature to 640-650 DEG C, and keeping the temperature for 3-4 hours; and then performing whole-course furnace cooling, reducing the temperature to 150 DEG C, and conducting discharging . According to the heat treatment method, the thermal stress during water cooling is reduced, and the deformation and cracking tendency of the roll shaft is reduced.

Description

technical field [0001] The invention relates to the field of heat treatment of castings, in particular to a method for heat treatment of a roller shaft. Background technique [0002] The roller shaft is an important part of heavy equipment, and its quality level directly affects the overall level and operational reliability of major equipment. It is one of the key technologies in the field of major equipment manufacturing. Its service environment is complex and safety requirements are high. If premature failure or safety accident occurs during use, the loss will be unbearable. Therefore, it must have excellent mechanical properties, and a reasonable and scientific heat treatment process is the guarantee for the roll to obtain the expected mechanical properties and safe and effective service. Post-forging heat treatment is an important prerequisite for reducing forging residual stress, improving microstructure uniformity, avoiding and reducing the risk of hydrogen embrittleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/25C21D9/38C21D1/58
CPCC21D1/25C21D9/38C21D1/58C21D2211/009
Inventor 韩美华黄海峰吴加兵
Owner 南京联银重型机械有限公司
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