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Preparation method of exhaust door

A technology of exhaust valves and raw materials, which is applied in the field of automotive machinery parts, can solve the problems of large heating area, large heating area of ​​the head, complex processing, etc., and achieve the effect of improving wear resistance and heat resistance

Inactive Publication Date: 2018-01-12
李林君
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spherical top valve is suitable for the exhaust valve, which has high strength, low exhaust resistance and good exhaust gas elimination effect, but it has a large heating area, large mass and inertia, and complex processing
The trumpet type has a certain streamline shape, which can reduce the intake resistance, but its head has a large heating area, so it is only suitable for the intake valve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing an exhaust valve, characterized in that it comprises the following steps: (1) melting and forging raw materials to obtain an exhaust valve blank; (2) straightening; (3) surface treatment: The end face of the blank is nano-treated and polished to grind the cone surface; (4) Surfacing alloy treatment on the end of the exhaust valve; (5) Tempering treatment; (6) Nitriding treatment, (7) Grinding the cone surface after polishing .

[0018] The weight percent composition of the raw materials is: 9% Cr, 15% Mn, 5% Ni, 5% N, and the rest is iron.

[0019] In step (4), the alloy in the surfacing alloy treatment is titanium alloy.

[0020] Nitriding temperature is 360°C.

Embodiment 2

[0022] A method for preparing an exhaust valve, characterized in that it comprises the following steps: (1) melting and forging raw materials to obtain an exhaust valve blank; (2) straightening; (3) surface treatment: The end face of the blank is nano-treated and polished to grind the cone surface; (4) Surfacing alloy treatment on the end of the exhaust valve; (5) Tempering treatment; (6) Nitriding treatment, (7) Grinding the cone surface after polishing .

[0023] The weight percent composition of the raw materials is: 8% Cr, 18% Mn, 6% Ni, 3% N, and the rest is iron.

[0024] In step (4), the alloy in the surfacing alloy treatment is titanium alloy.

[0025] Nitriding temperature is 450°C.

Embodiment 3

[0027] A method for preparing an exhaust valve, characterized in that it comprises the following steps: (1) melting and forging raw materials to obtain an exhaust valve blank; (2) straightening; (3) surface treatment: The end face of the blank is nano-treated and polished to grind the cone surface; (4) Surfacing alloy treatment on the end of the exhaust valve; (5) Tempering treatment; (6) Nitriding treatment, (7) Grinding the cone surface after polishing .

[0028] The weight percent composition of the raw materials is: 10% Cr, 16% Mn, 5% Ni, 5% N, and the rest is iron.

[0029] In step (4), the alloy in the surfacing alloy treatment is titanium alloy.

[0030] Nitriding temperature is 540°C.

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PUM

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Abstract

The invention discloses a preparation method of an exhaust door. The preparation method of the exhaust door comprises the following steps: (1) raw materials are smelted for forging to prepare an exhaust door blank (2) the straightening is performed; (3) surface treatment: after the nanometer polishing is performed on the end surface of the exhaust door blank, a conical surface is grinded; (4) thealloy overlaying is performed at the tail end of the exhaust door; (5) the tempering is performed; (6) the nitriding is performed; and (7) the conical surface is grinded after polishing. The surface treatment technology is combined with the terminal alloy overlaying technology to effectively improve the wear resistance and the heat resistance of the intake door.

Description

technical field [0001] The invention relates to the field of automobile mechanical parts, in particular to a method for preparing an exhaust valve. Background technique [0002] The function of the valve is to be responsible for inputting air into the engine and discharging the exhaust gas after combustion. From the structure of the engine, it is divided into intake valve and exhaust valve. The role of the intake valve is to draw air into the engine and mix it with fuel for combustion; the role of the exhaust valve is to discharge the burned exhaust gas and dissipate heat. [0003] The valve is composed of a valve head and a stem. The temperature of the valve head is very high (intake valve 570-670K, exhaust valve 1050-1200K), and it also bears the pressure of the gas, the force of the valve spring and the inertial force of the transmission component. The lubrication and cooling conditions are poor, and the valve must be It has certain strength, rigidity, heat resistance ...

Claims

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Application Information

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IPC IPC(8): B23P15/00
Inventor 李林君
Owner 李林君
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