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Remelting processing method for suction and exhaust valve casing of internal combustion engine

A technology for the intake and exhaust of an internal combustion engine and its treatment method, which is applied to lift valves, valve devices, mechanical equipment, etc., can solve problems such as the inability to effectively resist exhaust gas erosion, and achieve the purpose of avoiding the remelting of the weld, improving the bonding strength, and ensuring the bonding strength. Effect

Active Publication Date: 2015-06-24
CRRC CHANGZHOU DIESEL ENGINE COMPONENTS CO LTD +1
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AI Technical Summary

Problems solved by technology

[0005] However, since the structure of the sprayed layer is a layered structure formed by interlacing tiny particles, it is porous, and even some pores continue from the surface of the coating to the surface of the substrate to be protected, so it is still not effective against diesel engine emissions. Exhaust erosion

Method used

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Examples

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Effect test

Embodiment 1

[0027] This embodiment is a method for remelting the intake and exhaust valve housing of an internal combustion engine, including the following steps:

[0028] ①The brazing surface of the fine car valve casing; the brazing surface of the valve casing includes the parts where the upper valve body and the lower valve body are connected and matched, and the parts where the lower valve body and the valve seat are connected and matched.

[0029] ②Sandblasting the brazing surface and spraying surface of the valve housing; the spraying surface of the valve housing includes the outer circular surface of the valve housing and the inner hole flow channel surface of its intake and exhaust passages.

[0030] ③ Use a wire brush and acetone to scrub the brazing surface and all sprayed surfaces of the valve housing to remove oxides and dirt on the surface.

[0031] ④Preset brazing filler metal at the brazing seam of the valve housing; the brazing filler metal is copper or nickel-based brazin...

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Abstract

The invention discloses a remelting processing method for a suction and exhaust valve casing of an internal combustion engine. The method comprises the following steps of 1, finishing the brazing surface of the valve casing; 2, sandblasting the brazing surface and the coating surface of the valve casing; 3, scrubbing the brazing surface and the coating surface of the valve casing with a wire brush; 4, pre-arranging a brazing filler metal in the brazing seams of the valve casing; 5, fastening the upper valve body, the lower valve body and the valve seat of the valve casing by using bolts; 6, spraying a high-temperature anti-corrosion coating layer on the coating surface of the valve casing; and 7, placing the valve casing into a high-temperature reducing furnace, simultaneously brazing the three parts of the valve casing, and remelting of the high-temperature anti-corrosion coating layer. According to the method, the brazing seams of the valve casing are protected effectively and prevented from being corroded by an exhaust gas, thereby preventing brazing seam leakage caused by brazing seam corrosion.

Description

technical field [0001] The invention relates to a remelting treatment method for an intake and exhaust valve housing of an internal combustion engine, in particular to a remelting treatment method for an intake and exhaust valve housing of an internal combustion engine formed by high-temperature brazing of an upper valve body, a lower valve body and a valve seat. Background technique [0002] The intake and exhaust valve casing of the internal combustion engine is a key part of the gas distribution mechanism of the internal combustion engine. It has a circulating water cooling structure and a complex structure. It is generally welded by a valve seat with a high-temperature wear-resistant alloy surfacing layer and a valve body with a water-cooled structure. Generally, it can be divided into two-section valve casing and three-section valve casing. The two-section valve casing is generally made of cast steel valve body and valve seat by vacuum electron beam welding. The three-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/12C23C4/08F01L3/04C23C4/06
Inventor 李灵敏林英豪
Owner CRRC CHANGZHOU DIESEL ENGINE COMPONENTS CO LTD
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