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Enhanced engine valve and manufacturing process thereof

A technology for engine valve and preparation process, which is applied to engine components, machines/engines, mechanical equipment, etc., can solve problems such as difficulty in meeting valve usage requirements, high working temperature of valve cone surfaces, and large working stress, and achieve good product reliability. , Good processing technology, wide application effect

Inactive Publication Date: 2017-02-15
HUNAN TYEN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the valve is nitrided as a whole, it can improve the wear resistance of the valve stem, cone surface, rod end surface and lock clip groove. Due to the low working stress of the valve stem, lock clip groove, and some engine valve stem end surfaces, the valve The nitrided layer can meet the requirements of the valve, but it will not meet the requirements for the end face of the valve stem with a large working stress
However, the working temperature of the valve cone surface is relatively high and the working stress is relatively large. The nitrided layer can only improve the initial wear resistance of the valve cone surface, and the nitrided layer will be completely worn away later, so it is difficult to meet the requirements of the valve.

Method used

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  • Enhanced engine valve and manufacturing process thereof
  • Enhanced engine valve and manufacturing process thereof
  • Enhanced engine valve and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] see image 3 , taking the valve made of GH4080A material in the national standard GB / T12773-2008 "Steel and Alloy Bars for Internal Combustion Engine Valves" as an example, to prepare the reinforced engine valve in this embodiment, the preparation process is as follows:

[0033] In the first step, GH4080A material is used for batching and smelting treatment;

[0034] Step 2, blank forming;

[0035] Step 3, cut the total length to ensure the total length of the valve;

[0036] Step 4, solution treatment, the solution temperature is 1050°C, and the solution time is 1h;

[0037] Step 5, forging the valve cone surface and rod end surface;

[0038] Step 6, aging treatment, the aging temperature is 710°C, and the air cooling time is 16h.

[0039] After the processing of the valve formed by GH4080A material is completed, the hardness of the valve cone surface and the end surface of the rod is 40HRC-48HRC.

Embodiment 2

[0041] see image 3 , taking the NCF3015 material in the valve material national standard GB / T12773-2008 "Steel and Alloy Bars for Internal Combustion Engine Valves" as an example to prepare the reinforced engine valve in this embodiment, the preparation process is as follows:

[0042] The first step is to use NCF3015 material for batching and smelting treatment;

[0043] Step 2, blank forming;

[0044] Step 3, cut the total length to ensure the total length of the valve;

[0045] Step 4, solution treatment, the solution temperature is 1050°C, and the solution time is 0.5h;

[0046] Step 5, forging the cone surface of the valve; Step 6, aging treatment, the aging temperature is 710°C, and the air cooling time is 4h.

[0047] After the processing of the NCF3015 material molded valve is completed, the hardness of the valve cone surface is 44HRC-52HRC.

Embodiment 3

[0049] see Figure 4 , taking the NCF3015 material in the valve material national standard GB / T12773-2008 "Steel and Alloy Bars for Internal Combustion Engine Valves" as an example to prepare the reinforced engine valve in this embodiment, the preparation process is as follows:

[0050] The first step is to use NCF3015 material for batching and smelting treatment (the hardness of the raw material is lower than 30HRC: austenitic materials such as "solid solution state" and "solid solution and semi-solid solution critical state");

[0051] Step 2, blank forming (the valve blank is formed by hot forging, and the hardness of the valve cone surface after hot forging will be lower than that of the raw material before forming);

[0052] Step 3, cut the total length to ensure the total length of the valve;

[0053] Step 4, forging the valve cone surface and rod end surface;

[0054] Step 5, aging treatment, the aging treatment temperature is 750°C, and the air cooling time is 4h.

...

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Abstract

The invention discloses an enhanced engine valve. The enhanced engine valve comprises a valve retainer part and a valve rod part which are integrally molded together with the valve retainer part, wherein both the valve retainer part and the valve rod part are made from an austenite material; the conical surface of the valve retainer part is treated through a forging process to form a first hardened layer of which the hardness is 40HRC to 52HRC; the rod end face of the valve rod part is treated through the forging process to form a second hardened layer of which the hardness is 40HRC to 52HRC. The invention further discloses a manufacturing process of the enhanced engine valve. The manufacturing process has the beneficial effects that the conical surface and the rod end face needing to be hardened are hardened in at a blank stage of the valve, and the hardness of a surface being subjected to surface hardening treatment is higher than that of a surface being subjected to the conventional rolling treatment.

Description

technical field [0001] The invention relates to the technical field of engine valves, in particular to a reinforced engine valve and a preparation process thereof. Background technique [0002] Due to the high operating temperature of the intake and exhaust valves of the engine, the exhaust valve disc is often made of austenitic heat-resistant steel or austenitic superalloy valve material, and in some cases the intake valve disc is also made of austenitic type. Air valve material. [0003] Austenitic steel has an austenitic structure at room temperature, is non-magnetic and has excellent corrosion resistance, high toughness and plasticity. However, due to the low hardness and poor wear resistance of austenitic steel, its surface wear resistance cannot meet the requirements of wear resistance. The use environment with high performance requirements greatly reduces its service life. [0004] In order to improve the wear resistance of the valve cone surface and the rod end sur...

Claims

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Application Information

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IPC IPC(8): F01L3/02C21D7/04
CPCF01L3/02C21D7/04
Inventor 江文广刘旭晶卢钟祎李桥赵宇波施强元
Owner HUNAN TYEN MACHINERY
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