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Emergency soaking treatment process of tufftriding product

A treatment process, soft nitriding technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of product size expansion, abnormal change of metallographic structure, product scrapping, etc., to ensure qualified rate effect

Active Publication Date: 2012-02-08
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the actual production of nitrocarburization, when the products in the furnace cannot be automatically operated or adjusted according to the normal rhythm due to some equipment failure or other reasons, this situation is called simmering furnace, and the products will continue to burn in the furnace due to improper handling. Heated, resulting in product size expansion or abnormal changes in metallographic structure, resulting in product scrapping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0017] An emergency simmering furnace treatment process for soft nitriding products, comprising the following steps:

[0018] When the products in the nitrocarburizing furnace cannot be normally and automatically operated or adjusted within 20 minutes due to a fault, close the nitrocarburizing gas supply system and stop the NH 3 , CO 2 supply;

[0019] Shut down all the heating systems of the equipment, create a furnace pressure failure, flush the furnace for 1 hour, adjust the control system of each step of the equipment, and make the equipment run to the safe initial state of each step, then shut down the operation control system of the equipment;

[0020] After flushing the furnace, adjust the N 2 flow, so that N 2 With 2-2.5M 3 The flow rate of / H is continuously passed into the nitrocarburizing furnace, and the nitrocarburizing furnace and each N in the front and rear chambers are closed at the same time. 2 purge valve;

[0021] The workpiece cools down with...

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PUM

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Abstract

The invention relates to an emergency soaking treatment process of a tufftriding product. The process comprises the following steps of: closing a tufftriding gas supply system and all heating systems, rush-sweeping a furnace hearth to ensure that N2 is introduced into the tufftriding furnace hearth continuously at a flow speed of 2-2.5M<3> / H, closing N2 rush-sweeping valves of the tufftriding furnace hearth as well as a front chamber and a rear chamber, cooling a workpiece with a tufftriding furnace, waiting for repairing of the device, keeping the supply of a device main power supply, an UPS(Uninterruptible Power Supply), nitrogen and compressed air, maintaining the furnace pressure of the device to be above 3mbar, maintaining continuous supply of the compressed air to a tufftriding device, after each device is restored normal, raising the temperature of the whole furnace, directly introducing tufftriding gas according to the process requirement by the furnace pressure or introducing tufftriding gas after the furnace hearth is rush-swept, after the tufftriding gas is introduced for 10 minutes, starting the device for automatically operating, and directly discharging the soaking product in the furnace hearth. The process provided by the invention can effectively guarantee that the product in the furnace hearth does not generate quality abrupt change, thereby ensuring the qualification rate of the product in the furnace hearth.

Description

technical field [0001] The invention relates to a nitrocarburization heat treatment process for a product, in particular to an emergency simmering furnace treatment process for a nitrocarburized product. When the products in the nitrocarburizing furnace cannot be automatically operated or adjusted according to the normal rhythm due to certain equipment failures or others, the process of the present invention can effectively ensure that the quality of the products in the furnace does not change suddenly, ensuring the pass rate of the products in the furnace. Background technique [0002] In the actual production of nitrocarburization, when the products in the furnace cannot be automatically operated or adjusted according to the normal rhythm due to certain equipment failures or other reasons, this situation is called simmering furnace, and the products will continue to burn in the furnace due to improper handling. When heated, the size of the product will expand or the metall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/24
Inventor 徐萍刘小珍
Owner JIANGLING MOTORS