Control system of carbon intensity distribution of low-pressure carburized layer and control method thereof

A technology of low-pressure carburizing and distribution control, which is applied in the direction of comprehensive factory control, comprehensive factory control, electrical program control, etc., and can solve problems such as inability to correctly control the concentration distribution of carburized layer, control, and boundary conditions.

Active Publication Date: 2011-05-18
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this literature uses the average carbon flow rate to solve the diffusion partial differential equation, which has the following two disadvantages: ① Taking the average carbon flow rate as the boundary condition does not conform to the actual situation, so the process specification obtained by this method cannot achieve the correct control of the concentration distribution of the carburized layer ② "average carbon flow" is a function of the three variables of steel composition, carburizing temperature and carburizing time
The low-pressure pulse carburizing control system proposed

Method used

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  • Control system of carbon intensity distribution of low-pressure carburized layer and control method thereof
  • Control system of carbon intensity distribution of low-pressure carburized layer and control method thereof
  • Control system of carbon intensity distribution of low-pressure carburized layer and control method thereof

Examples

Experimental program
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Effect test

Embodiment 2

[0066] The ICBD horizontal vacuum low-pressure pulse carburizing furnace from ECM Company is selected, with a power of 1000kW. Furnace loading capacity 500kg. Use C3H8 as carburizing gas. The throughput is 3800 liters / hour. The nitrogen flow rate is 1500 liters / hour. The maximum vacuum degree in the furnace is 10 -2 mbar. The pressure in the furnace during the carburizing stage is 300mbar. The pressure in the furnace during the diffusion stage is 70mbarmin.

[0067] Select DELL model industrial control machine.

[0068] Choose DRUCK / IFM / KELLER / Rosemount pressure sensor. The nitrogen regulating valve model is TYCO / BURKERT / COAX. The diameter of the nitrogen input pipe is 50mm. Carburizing gas input pipe diameter 25mm. The carburizing gas regulating valve model is VALPES. The vacuum pump model is BOC / RIETSCHLE.

[0069] Attach the above equipment and devices to the figure 1 The way shown is linked to become a low pressure pulse carburizing layer concentration distrib...

Embodiment 3

[0076] The SJTUVLC-75 vacuum low-pressure pulse carburizing furnace developed by Shanghai Jiaotong University is selected, with a power of 75kW. The size of the charging area is 600mm×600mm×900mm, and the furnace loading capacity is 400kg. use C 2 h 2 for carburizing gas. Flux 750 l / h. The nitrogen flow rate is 1500 liters / hour. The maximum vacuum degree in the furnace is 10 -2 mbar. The pressure in the furnace during the carburizing stage is 150mbar. The pressure in the furnace during the diffusion stage is 75mbar.

[0077] Select Advantech IPC610 industrial control machine as the controller.

[0078] Choose DRUCK / IFM / KELLER / Rosemount pressure sensor. The nitrogen regulating valve model is TYCO / BURKERT / COAX. The diameter of the nitrogen input pipe is 30 mm. Carburizing gas input pipe diameter 20mm. The carburizing gas regulating valve model is VALPES. The vacuum pump model is BOC / RIETSCHLE.

[0079] Attach the above equipment and devices to the figure 1 The way...

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Abstract

The invention relates to a control system of the carbon intensity distribution of a low-pressure carburized layer and a control method thereof, belonging to the technical field of metal heat treatment. The control system comprises a low-pressure carburizing furnace, a controller, a pressure sensor, a thermoelectric couple, a nitrogen regulating valve, a nitrogen input pipe, a carburizing gas regulating valve, a carburizing gas input pipe, a vacuum system and a gas suction pipe. The invention simulates automatic optimized low-pressure pulse process parameters by using carburized layer concentration distribution values and realizes the control functions; the carburizing gas regulating valve executes on/off action according to an order of the controller to control carburizing section time and diffusing section time, therefore the accurate control of the intensity distribution of the carburized layer is realized; and in addition, the invention can keep high carburizing speed and prevent the tolerance of surface carbides, accurately controls the surface carbon intensity and the depth and the intensity distribution of the carburized layer, reduces the accumulated carbon black inside the low-pressure carburizing furnace, is free from depending on a gas component sensor and has the advantages of configuration simplification, easy implementation, high reliability and easy maintenance.

Description

technical field [0001] The invention relates to a control device and a control method in the technical field of metal heat treatment, in particular to a low-pressure carburizing layer carbon concentration distribution control system and a control method thereof. Background technique [0002] Low-pressure carburizing, also known as vacuum carburizing, is a carburizing process carried out in a carburizing atmosphere below atmospheric pressure, which is carried out by decomposing and absorbing carbonitride gas on the steel surface. [0003] The carburizing reaction that occurs when methane is used is: [0004] [0005] The carburizing reaction that occurs when propane is used is: [0006] [0007] The carburizing reaction that occurs when ethane is used is: [0008] [0009] After searching the existing technology, it is found that the document [1] "Ipsen Avac Acetylene Low Pressure Carburizing Process Equipment and Its Industrial Application" Ipsen Industrial Furnac...

Claims

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Application Information

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IPC IPC(8): G05B19/418C23C8/20
CPCY02P90/02
Inventor 潘健生钱初钧沈玉明顾剑锋孔铭
Owner SHANGHAI JIAO TONG UNIV
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