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Manufacture of air valve seat specially for gas engine

A technology for a gas engine and a manufacturing method, which is applied in the metallurgical field, can solve the problems of valve leakage, corrosion, and the engine cannot work normally, and achieves the effect of meeting the use requirements and improving the thermal hardness and corrosion resistance.

Inactive Publication Date: 2004-04-07
济南轻骑发动机有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The valve seat prepared by this method is suitable for fuel engines, but once the liquefied petroleum gas is used as fuel, the corrosion resistance of the powder metallurgy sintered valve seat is significantly reduced. When the motorcycle runs to 1000Km, corrosion begins to appear. After running 2000Km , the corrosion is serious, causing the valve to leak, and the engine cannot work normally

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] 1) Casting blanks: The process includes sand mixing, modeling, smelting, pouring, and sand falling that are commonly used for valve seats.

[0013] 2) Heat treatment:

[0014] According to the common heat treatment method of valve seat, temperature control: normalizing temperature 1000℃, heat preservation 6 hours, air cooling; tempering temperature 320℃, heat preservation 2.5 hours, air cooling;

[0015] 3) Machining:

[0016] According to the commonly used machining methods of the valve seat, the procedures are: deburring, flat end face, end face grinding, fine turning external circle, rough grinding external circle, chamfering external angle, car inner hole, fine grinding external circle.

[0017] Raw materials are added during the above smelting

[0018] Serial number

[0019] Ingredients

[0020] Serial number

[0021] Ingredients

[0022] Serial number

[0023] Ingredients

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PUM

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Abstract

The manufacture of air valve seat specially for gas combustion engine belongs to the field of metallurgy technology. The present invention features that the materials for the air valve seat consists of C 1.4-2.0 wt%, Si 1.5-2.4 wt%, Mn 0.5-0.9 wt%, Cr 16-23 wt%, Mo 3.0-4.2 wt%, Ni 1.2-1.6 wt%, B 0.5-1.4 wt% and V 0.5-0.9 wt% except Fe chemically and include cast iron, ferrochromium, ferromolybdenum, ferroboron, ferrovanadium, nickel block, ferromanganese, etc. and the manufacture process includes casting blank, heat treatment and machining. The air valve seat of the present invention has high hardness and high corrosion resistance, and the bench experiment for 200 hr and the road experiment for 16000 Km with LPG as fuel shows no corrosion. It is especially suitable for gas burning engine for motor bicycle.

Description

[0001] Field [0002] The invention relates to a method for manufacturing a special valve seat for a gas engine, in particular to a method for manufacturing a special valve seat for a gas engine for motorcycles and mopeds, and belongs to the technical field of metallurgy. Background technique [0003] At present, domestic and international engine valve seat materials for motorcycles are powder metallurgy, which is mainly made by the general method of sintering, so it is also called "sintered valve seat". The valve seat prepared by this method is suitable for fuel-fueled engines, and once the LPG is used as the fuel, the corrosion resistance of the powder metallurgy sintered valve seat is significantly reduced. When the motorcycle runs to 1000Km, it begins to corrode. After running 2000Km , The corrosion is serious, causing the valve to leak and the engine can not work normally. Summary of the invention [0004] In order to improve the corrosion resistance of the gas engine valve s...

Claims

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Application Information

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IPC IPC(8): C21D9/00C22C38/24F01L3/02
Inventor 陈革新刘永志张根生陈建龙王冰
Owner 济南轻骑发动机有限公司
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