Air inlet valve and manufacturing method thereof

An intake valve and alloy composition technology, applied in mechanical equipment, lift valves, engine components, etc., can solve the problems of toughness that cannot meet the standards of industrial applications, high price, etc., improve mechanical and chemical properties, and improve surface strength. , The effect of improving friction and wear performance

Inactive Publication Date: 2014-03-12
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This material can be greatly improved in terms of high temperature resistance, however, its toughness is not yet up to the standard for industrial applications, and there are problems with high prices

Method used

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  • Air inlet valve and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The intake valve is processed by surface nanometerization, low-temperature nitriding, surfacing welding tungsten-zirconium alloy and other processes. The specific steps are as follows:

[0024] (1) Ingredients, alloy weight percentage composition: C: 0.32%; Si: 0.17%; Mo: 2.5%; Mn: 0.50%; Cr: 0.80%; W: 0.50%; the remaining material is Fe with a purity of 99.8% , mix the alloy material evenly;

[0025] (2) Melting in a vacuum induction furnace at a temperature of 1600°C for 1.5 hours;

[0026] (3) Adopt forging molding to obtain the valve blank;

[0027] (4) Carry out quenching and tempering heat treatment, that is, heat preservation at 850 ° C for 1 hour, quenching, then heating to 500 ° C, heat preservation for 2 hours, and finally air cooling; then cutting, the processing conditions are: the impact head is spherical, and the output end is circular The radius is 2mm, the rotation speed is 200r / min; the amplitude of the impact head is 5μm; finally, the surface is ultr...

Embodiment 3

[0043] The intake valve is processed by surface nanometerization, low-temperature nitriding, surfacing welding tungsten-zirconium alloy and other processes. The specific steps are as follows:

[0044] (1) Ingredients, alloy weight percentage composition is: C: 0.34%; Si: 0.25%; Mo: 2.75%; Mn: 0.60%; Cr: 1.00%; W: 0.80%; the rest is Fe with a purity of 99.8% , mix the alloy material evenly;

[0045] (2) Melting in a vacuum induction furnace at a temperature of 1630°C for 1.2 hours;

[0046] (3) Adopt forging molding to obtain the valve blank;

[0047] (4) Carry out quenching and tempering heat treatment, that is, heat preservation at 800°C for 1.5h, quenching, then heating to 500°C, heat preservation for 2 hours, and finally air cooling; then cutting, the processing conditions are: the impact head is spherical, and the output end is round The radius of the arc is 2mm, the rotation speed is 200r / min; the amplitude of the impact head is 5μm; finally, the surface is ultrasonical...

Embodiment 4

[0053] The intake valve is processed by surface nanometerization, low-temperature nitriding, surfacing welding tungsten-zirconium alloy and other processes. The specific steps are as follows:

[0054] (1) Ingredients, alloy weight percentage composition: C: 0.36%; Si: 0.27%; Mo: 2.95%; Mn: 0.67%; Cr: 0.87%; W: 0.68%; the remaining material is Fe with a purity of 99.8% , mix the alloy material evenly;

[0055] (2) Melting in a vacuum induction furnace at a temperature of 1600°C for 1 hour;

[0056] (3) Adopt forging molding to obtain the valve blank;

[0057] (4) Carry out quenching and tempering heat treatment, that is, heat preservation at 825°C for 1h, quenching, then heating to 480°C, heat preservation for 2.5 hours, and finally air cooling; then cutting, the processing conditions are: the impact head is spherical, and the output end is circular The radius is 2mm, the rotation speed is 200r / min; the amplitude of the impact head is 5μm; finally, the surface is ultrasonical...

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Abstract

The invention discloses an air inlet valve and a manufacturing method thereof. Alloy for manufacturing the air inlet valve comprises the following components in percentage by weight: 0.32-0.40% of C, 0.17-0.37% of Si, 2.5-3.5% of Mo, 0.50-0.80% of Mn, 0.80-1.10% of Cr, 0.50-1.0% of W, less than or equal to 0.030% of Ni, less than or equal to 0.015 of P, less than or equal to 0.015 of S, less than or equal to 0.010% of Cu and the balance of Fe. The air inlet valve is manufactured by the technologies such as surface nanocrystallization, low-temperature nitriding and surfacing of tungsten-zirconium alloy and the like. The air inlet valve has high surface strength, high hardness, good abrasion performance and long service life.

Description

technical field [0001] The invention relates to the fields of mechanical manufacturing and metal materials, in particular to an intake valve and a preparation method thereof. Background technique [0002] The valve is one of the key parts of the engine, and it is a direct part used to open or close the intake and exhaust passages. The valves are divided into intake valves and exhaust valves. The air enters the engine cylinder through the intake valve and is mixed with fuel for combustion. The exhaust gas generated after combustion is discharged from the cylinder through the exhaust valve, so that fresh air enters the cylinder and burns to generate the driving force of the vehicle. Get rid of exhaust gas. At present, the engine is generally provided with a plurality of valves. It is common to have 4 valves per cylinder, and a 4-cylinder engine has a total of 16 valves. This multi-valve structure is easy to form a compact combustion chamber, and the fuel injector is in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22F01L3/02B23P15/00
Inventor 杨卫国
Owner JIANGSU UNIV OF SCI & TECH
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