Automatic pressure stabilization and gas nitriding control method

A technology of gas nitriding and voltage stabilization, which is applied in the field of gas chemical heat treatment, can solve problems such as excess flow, potential safety hazards, and equipment overpressure, and achieve the effect of ensuring pressure

Inactive Publication Date: 2018-02-23
法垄热工技术(上海)有限公司
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Problems solved by technology

In actual production, it will lead to overpressure and overflow of equipment, resulting in potential safety hazards

Method used

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  • Automatic pressure stabilization and gas nitriding control method

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] When the material of a certain alloy composition needs to be gas nitrided, according to the technical requirements, different nitrogen potential Kn values ​​need to be applied in different process sections, such as switching from Kn=2 to Kn=1.

[0042] When the system is at Kn=2, NH3=3Nm3 / h, DNH3=1Nm3 / h, the furnace pressure is P1=1020mbar, the hydrogen probe measured and calculated Kn-real=2.0;

[0043] After a period of time, the Kn setting value is automatically switched to Kn=1. At this time, the actual Kn-real=2.0 in the system is far > 1. According to the PID parameters, it is calculated that DNH3 needs to be increased by 2Nm3 / h.

[0044] According to the traditional method, the total flow F=3+3=6Nm3 / h. It will increase by 50% compared with the original flow rate of 4Nm3 / h, and the furnace pressure will rise greatly in a short period of ti...

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Abstract

The invention discloses an automatic pressure stabilization and gas nitriding control method. The method comprises the steps that (1) the partial pressure, stability and other technological parametersof ammonia gas and hydrogen gas in an atmosphere are obtained through a hydrogen probe or other measuring means; (2) the partial pressure of the ammonia gas and the partial pressure of the hydrogen gas are transmitted to a PLC; (3) the PLC calculates the nitrogen potential value Kn according to a set formula, so that the value Kn-real is obtained; (4) the nitrogen potential value Kn-real obtainedthrough measuring is compared with the value Kn-set which is set by the technology, and a deviation value is obtained; (5) a command is output to a mass flowmeter MFC according to the deviation valueand a control unit of the PLC, and flow control is conducted; (6) after the flow is changed, thus, the value Kn of the atmosphere in a furnace keeps being changed and measured by the hydrogen probe,and closed-loop control is completed; and (7) a pressure sensor or a probe P is additionally arranged to directly measure pressure change, and flow control is optimized through new variables.

Description

technical field [0001] The invention will be widely used in the field of gas chemical heat treatment, and is mainly used in the industrial application of nitriding by using the mixed atmosphere of ammonia gas and nitrogen gas and hydrogen gas. Such as the surface nitriding process of metal parts, stainless steel plate, wire, bright annealing process of parts, brazing process in protective atmosphere, etc., especially involves an automatic control method for voltage-stabilizing gas nitriding. Background technique [0002] The gas nitriding process is an important process in the surface heat treatment of metal materials, and it is widely used in metal parts such as gears, bearings, and connecting rods. Through the gas nitriding process, the surface of metal parts can obtain high hardness, wear resistance, corrosion resistance and other excellent properties. [0003] There are many control methods for the process of gas nitriding, including the traditional flow control method,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/24
CPCC23C8/24
Inventor 蒋志俊
Owner 法垄热工技术(上海)有限公司
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