Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method

A technology for exhaust manifolds and oxide layers, which is applied to exhaust devices, coatings, solid-state diffusion coatings, etc., and can solve the problems of poor appearance quality, easy rust and corrosion on the outer wall of the exhaust manifold, and poor wear resistance of the joint surface And other problems, to achieve good wear resistance and stability, improve appearance quality, improve the effect of sealing

Active Publication Date: 2007-01-31
FEILONG AUTO COMPONENTS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing engine exhaust manifolds on the market, due to the irregular shape and complex structure of the exhaust manifold parts, the traditional manufacturing process is cast iron as a whole, and the surface treatment method of the cast exhaust manifold parts usually adopts traditional anti-rust oil Rust process, the joint surface of this exhaust manifold is not resistant to wear, and because the working environment of the exhaust manifold is harsh, the rust-proof period of the anti-rust oil is only 6 months, and the outer wall of the exhaust manifold is easy to rust and corrode. Poor appearance

Method used

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  • Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method
  • Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method
  • Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Clean the cast iron exhaust manifold;

[0022] 2) Install the workpiece in the fixture, and put the fixture with the workpiece into the steam oxidation treatment furnace at room temperature;

[0023] 3) Set the furnace temperature instrument at 300°C, turn on the power to raise the temperature, and open the nitrogen valve to feed in nitrogen while the temperature is rising. The speed of nitrogen feeding is 16m 3 / h;

[0024] 4) After the furnace temperature reaches the set temperature of 300°C, keep it warm for 1.5 hours. While keeping warm, nitrogen gas is introduced at a speed of 16m 3 / h;

[0025] 5) Set the furnace temperature instrument at 630°C, continue to heat up while maintaining the nitrogen gas flow, turn off the nitrogen gas when the temperature reaches the set temperature, and pass in water vapor, the speed of water vapor is 5±1m 3 / h (the measurement error of water vapor is ±1m 3 / h);

[0026] 6) Keep the furnace temperature at the set temperature ...

Embodiment 2

[0029] 1) Clean the cast iron exhaust manifold;

[0030] 2) Install the workpiece in the fixture, and put the fixture with the workpiece into the steam oxidation treatment furnace at room temperature;

[0031] 3) Set the furnace temperature instrument at 350°C, turn on the power supply to raise the temperature, and open the nitrogen valve to feed nitrogen gas while heating up, and the nitrogen gas feeding speed is 18m3 / h;

[0032] 4) After the furnace temperature reaches the set temperature of 350°C, it is kept for 1.5 hours, and nitrogen gas is introduced at the same time as the temperature is kept at a rate of 18m3 / h;

[0033] 5) Set the furnace temperature instrument at 670°C, continue to raise the temperature while maintaining the nitrogen gas flow, turn off the nitrogen gas when the temperature reaches the set temperature of 670°C, and let water vapor flow in at a speed of 5±1m3 / h ( The measurement error of water vapor is ±1m3 / h);

[0034] 6) Keep the furnace temperatur...

Embodiment 3

[0037] 1) Clean the cast iron exhaust manifold;

[0038] 2) Install the workpiece in the fixture, and put the fixture with the workpiece into the steam oxidation treatment furnace at room temperature;

[0039] 3) Set the furnace temperature instrument at 420°C, turn on the power supply to raise the temperature, and open the nitrogen valve to feed nitrogen gas while heating up, and the nitrogen gas feeding speed is 20m3 / h;

[0040] 4) After the furnace temperature reaches the set temperature of 420°C, it is kept for 1.5 hours, and nitrogen gas is introduced at the same time as the temperature is kept at a rate of 20m3 / h;

[0041] 5) Set the furnace temperature instrument at 690°C, continue to raise the temperature while maintaining the nitrogen gas flow, turn off the nitrogen gas when the temperature reaches the set temperature of 690°C, and let water vapor flow in at a speed of 5±1m3 / h (the measurement error of water vapor is ±1m3 / h);

[0042] 6) Keep the furnace temperatur...

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Abstract

The inventive surface oxidizing process of a cast-iron exhaust manifold comprises the following steps of putting the work piece in the steam oxidation treatment furnace; switching on the power supply and starting to raising temperature; turning on the nitrogen valve and leading in the nitrogen while raising temperature and meanwhile going on raising temperature; closing the nitrogen when the temperature reaches the setting one and then leading in steam pressure for a certain time; closing steam when the furnace temperature is lowered to the setting one and then opening the furnace lid and lifting the work piece. By using the above process, a compact ferriferrous oxide film is formed on the surface of the cast-iron exhaust manifold.

Description

technical field [0001] The invention belongs to the technical field of automobile engine accessories, and in particular relates to a cast iron exhaust manifold with an oxidized layer on the surface and a surface oxidized method thereof. Background technique [0002] Existing engine exhaust manifolds on the market, due to the irregular shape and complex structure of the exhaust manifold parts, the traditional manufacturing process is cast iron as a whole, and the surface treatment method of the cast exhaust manifold parts usually adopts traditional anti-rust oil Rust process, the joint surface of this exhaust manifold is not resistant to wear, and because the working environment of the exhaust manifold is harsh, the rust-proof period of the anti-rust oil is only 6 months, and the outer wall of the exhaust manifold is easy to rust and corrode. Poor appearance quality. Contents of the invention [0003] Aiming at the problems existing in the existing cast iron exhaust manifo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N7/06C23C8/14F01N13/06
Inventor 孙耀忠冯长虹赵书峰王瑞金李振河杨书善袁铁英杨兰芹梁慧丽胡宾
Owner FEILONG AUTO COMPONENTS CO LTD
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