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Wear-resistant intake valve and preparation method thereof

An intake valve and alloy composition technology, applied in mechanical equipment, lift valves, valve devices, etc., can solve the problems of high price, toughness can not meet the standards of industrial applications, etc., to improve surface strength, mechanical and chemical properties improvement , the effect of improving the overall 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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  • Wear-resistant intake valve and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0024] (1) Ingredients, the weight percentage of the alloy material used is: C: 0.32%; Si: 0.17%; Mo: 1.2%; Mn: 0.50%; Nb: 0.5%; Cr: 0.80%; W: 0.50%; For 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, th...

Embodiment 2

[0033] The wear-resistant intake valve is processed by surface nano-technology, low-temperature nitriding, surfacing welding tungsten-zirconium alloy and other processes. The specific steps are as follows:

[0034] (1) Ingredients, the weight percentage of the alloy material used is: C: 0.40%; Si: 0.27%; Mo: 0.5%; Mn: 0.80%; Nb: 0.2%; Cr: 1.10%; W: 1.0%; For Fe with a purity of 99.8%, mix the alloy material evenly.

[0035] (2) Melting in a vacuum induction furnace at a temperature of 1650°C for 1 hour;

[0036] (3) Adopt forging molding to obtain the valve blank;

[0037] (4) Carry out quenching and tempering heat treatment, that is, heat preservation at 850°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 rotational speed is 200r / min; the amplitude of the impact head is 5μm; finally, th...

Embodiment 3

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

[0044] (1) Ingredients, the weight percentage of the alloy material used is: C: 0.34%; Si: 0.25%; Mo: 0.75%; Mn: 0.60%; Nb: 0.3%; Cr: 1.00%; W: 0.80%, the remainder For 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 hour, quenching, then heating to 500°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...

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Abstract

The invention discloses a wear-resistant intake valve and a preparation method thereof. The intake valve adopts the following alloying constituents by weight percent: 0.32-0.40 percent of C, 0.17-0.27 percent of Si, 0.5-1.2 percent of Mo, 0.50-0.80 percent of Mn, 0.2-0.5 percent of Nb, 0.80-1.10 percent of Cr, 0.50-1.0 percent of W, no more than 0.030 percent of Ni, no more than 0.015 percent of S, no more than 0.010 percent of Cu and the balance of Fe. The intake valve is processed by the processes of surface nanocrystallization, low-temperature nitridation, build-up welding of tungsten zirconium alloy and the like and has the advantages of high surface strength and rigidity, good wear-resisting property and long service life.

Description

technical field [0001] The invention relates to the fields of mechanical manufacturing and metal materials, in particular to a wear-resistant 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 injec...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C33/04C21D8/00F01L3/02
Inventor 杨卫国
Owner JIANGSU UNIV OF SCI & TECH
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