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Machining technology for cylinder head valve seat ring and valve guide pipe hole

A valve seat ring and valve guide technology, which is applied in the direction of lift valves, engine components, machines/engines, etc., can solve problems such as large density differences of raw materials, poor uniformity of finished products, and harsh working conditions, and achieve uniform machining allowances, The production process is reasonable and the effect of improving the cooling effect

Inactive Publication Date: 2017-11-24
上柴动力海安有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercially available powder metallurgy valve seat is mainly iron-based powder metallurgy valve seat, which is mainly made of iron powder added with chromium-molybdenum alloy powder, graphite, and zinc stearate, mixed evenly according to the proportion, molded, sintered and melted. In this production method, due to the complex composition of materials and the large difference in raw material density, the finished product has the disadvantages of poor uniformity and high production cost. At the same time, due to the harsh working conditions, it needs to be processed under high temperature environment Bear the impact and wear of the valve, as well as the erosion and oxidation of the intake and exhaust flow, so there are extremely high requirements for the high temperature resistance, wear resistance and oxidation resistance of the valve seat ring

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A process for processing a cylinder head valve seat ring and a valve guide hole, comprising the following steps:

[0019] (1), raw material preparation: described cylinder head valve seat ring comprises the raw material composition of following weight percent: carbon 2.8%, chromium 20%, titanium 0.04%, vanadium 0.5%~0.8%, silicon 0.7%, manganese 0.6%, 0.2% copper, 0.35% molybdenum, 0.08% rare earth, and the balance is iron; the hardness of the raw material alloy of the valve seat ring is HRC45;

[0020] (2) Preliminary molding: feed and pressurize the base layer through the automatic formwork, press the base layer and control the height of the base layer, then press the leaching layer, and finally demould, and then sinter and immerse through the sintering furnace, respectively through pre-sintering and sintering , immersion, forming a blank, and then heat treatment;

[0021] (3) Finishing: the conical surface of the valve seat is processed by turning and boring, and th...

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PUM

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Abstract

The invention proposes a process for processing a cylinder head valve seat ring and a valve guide hole, comprising the following steps: (1) preparation of raw materials; (2) initial molding; (3) finishing; (4) inspection. The production process proposed by the present invention is reasonable, ensures the processing accuracy of the product, and effectively improves the production efficiency. At the same time, the process flow is optimized, and the production efficiency is improved through the CBN cutter. The single-edged reamer is used to overcome the machining allowance The machining error caused by offset, and the use of internal coolant flow improves the cooling effect and facilitates chip removal to ensure the cleanliness of the air passage. The positioning method makes the machining allowance uniform and reduces the generation of unqualified products. Reduced production costs.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a process for processing cylinder head valve seat rings and valve guide holes. Background technique [0002] The engine valve seat is an important part of the engine. It is the portal for the air to enter when the fuel of the internal combustion engine is burned and the exhaust gas to be discharged after combustion. Its main purpose is to ensure the sealing of the combustion chamber. At present, the commercially available powder metallurgy valve seat is mainly iron-based powder metallurgy valve seat, which is mainly made of iron powder added with chromium-molybdenum alloy powder, graphite, and zinc stearate, mixed evenly according to the proportion, molded, sintered and melted. In this production method, due to the complex composition of materials and the large difference in raw material density, the finished product has the disadvantages of poor uniformity and high production co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00F01L3/06
Inventor 姜金文
Owner 上柴动力海安有限公司
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