Method for preheating forged steel cold roll before induction quenching

A technology of induction hardening and induction preheating, which is applied in the field of preheating before induction hardening of forged steel cold rolls, can solve the problems of low processing efficiency, slow heat conduction, and high energy consumption, and achieves fast heating speed, convenient hoisting operation, and high processing efficiency. Efficient effect

Inactive Publication Date: 2012-11-07
耿震宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]A resistance furnace is used to preheat the roll as a whole. The preheating temperature is generally between 200°C and 400°C. The furnace relies on hot air circulation, and the heat conduction is relatively slow. It takes a long time, usually 12 to 18 hours, and the processing efficiency is low; the heating energy utilization rate of the resistance furnace is about 50%, and the energy consumption is high; Higher, it is not convenient for workers to operate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A batch of cold rolls produced for factory A, the material requirement is 86CrMoV7, the diameter of the roll body is ￠400mm, the hardness of the roll body is required to be 90HSD~95HSD, and the hardened layer is ≥15mm.

[0015] Induction preheating: the temperature is set to 680°C, the moving speed is set to 100mm / min, the preheating process ends, and when the roll returns to the initial quenching position, it takes about 30 minutes, during which the surface heat is conducted to the core, and the surface measurement temperature is 210 ℃ ~ 228℃, which meets the process requirements of the overall preheating temperature of 220℃. The process parameters of the final quenching process are basically the same as those of the quenching process after overall preheating.

[0016] After testing, the hardness of the cold roll body of this batch is 90-93HSD, and after the user uses it to the scrapped diameter, it is tested, the hardened layer is ≥ 15mm, the product quality fully mee...

Embodiment 2

[0018] For the cold roll produced by Factory B, the material requirement is MC3 (Cr3), the diameter of the roll body is ￠470mm, the hardness of the roll body is required to be 75HSD~80HSD, and the cold roll with a hardened layer ≥ 25mm is taken as an example.

[0019] Induction preheating: the temperature is set to 700°C, the moving speed is set to 110mm / min, the preheating process ends, and when the roll returns to the initial quenching position, it takes about 35 minutes, during which the surface heat is conducted to the core, and the surface measurement temperature is 290 ℃ ~ 310℃, meeting the overall preheating process requirements of 300℃. The process parameters of the final quenching process are basically the same as those of the quenching process after overall preheating.

[0020] After testing, the hardness of the cold roll body is 75-78 HSD, and after the user uses it to the scrapped diameter, it is tested, and the hardened layer is ≥ 25mm. The product quality fully m...

Embodiment 3

[0022] For the cold rolled roll produced by Factory C, the material requirement is MC5 (Cr5), the roll body diameter is ￠560mm, the roll body hardness requirement is 90HSD~95HSD, and the cold rolled roll with hardened layer ≥ 30mm is taken as an example.

[0023] Induction preheating: the temperature is set to 720°C, the moving speed is set to 100mm / min, the preheating process ends, and when the roll returns to the initial quenching position, it takes about 40 minutes, during which the surface heat is conducted to the core, and the surface measurement temperature is 345 ℃ ~ 356 ℃, meeting the overall preheating process requirements of 350 ℃. The process parameters of the final quenching process are basically the same as those of the quenching process after overall preheating.

[0024] After testing, the hardness of the cold rolling roll body is 92-95HSD, and after the user uses it to the scrapped diameter, the test shows that the hardened layer is ≥ 30mm, the product quality f...

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PUM

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Abstract

The invention discloses a method for preheating a forged steel cold roll before induction quenching. A quench machining tool is used for induction preheating at the proper temperature lower than AC1. A preheated part of the cold roll is not water-cooled during moving. By matching the heating temperature with the movement speed of the cold roll, surface heat is transferred inward during movement of the cold roll, and the inside and the outside of the cold roll are uniformly heated. The cold roll moves to an initial position after preheating. The surface temperature of the cold roll is controlled to 200-400 DEG C, and the overall heating is achieved. By the induction heating high in heating speed, the whole preheating process takes about 40 minutes, and machining efficiency is high. The induction heating depends on electromagnetic induction, energy utilization rate reaches more than 90% generally, and energy consumption is far lower than that of preheating by a resistance furnace. The initial temperature of the roll is low, and accordingly the roll is convenient for an operator to lift. The method achieves the effect of overall preheating that is achieved by the resistance furnace, and induction quenching can be performed right after the preheating.

Description

technical field [0001] The invention relates to a method for preheating a forged steel cold roll before induction quenching. Background technique [0002] Due to the increasingly high requirements for the depth of the hardened layer of cold rolls, domestic and foreign manufacturers basically use induction hardening in the production process of forged steel cold rolls. In order to improve the hardened layer and reduce the residual stress, the electric resistance furnace is used to preheat the roll as a whole before induction hardening, and after preheating, the roll is hoisted to the quenching machine for induction hardening. [0003] A resistance furnace is used to preheat the roll as a whole. The preheating temperature is generally between 200°C and 400°C. The furnace relies on hot air circulation, so the heat conduction is relatively slow, and the holding time is long. Generally, it takes 12 to 18 hours, and the processing efficiency is low. ; The heating energy utilizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/42C21D9/38C21D1/18
CPCY02P10/25
Inventor 耿震宇苗连军苏亚昕耿笠博苏亚琪苗雨欣高颖萱
Owner 耿震宇
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