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Reinforcing air intake valve for diesel engine of diesel locomotive and its manufacture

A technology for internal combustion locomotives and diesel engines, which is applied in the field of intake valves, can solve problems such as performance that cannot meet the working requirements, affect the service life of the valve, and cannot meet the service life, etc., and achieve excellent performance, extended maintenance period, and improved wear-resistant life. Effect

Inactive Publication Date: 2003-11-05
BEIJING TEYE IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The conical surface of the valve disc is strengthened by cladding the high-temperature hard-faced wear-resistant alloy by cone welding (as shown in Figure 1), which is not only complicated in process and difficult to manufacture, but also affects the overall structural performance of the valve. Over 10,000 kilometers of overlay welding area cracks and blocks are also one of the main causes of diesel engine valve accidents, which seriously affect the service life of the valve
[0004] 2. The performance of the valve material 4Cr4Ni14W2Mo cannot meet the working requirements of the intake valve of the diesel locomotive diesel engine, and the service life cannot meet the requirements of the reliability management of the Ministry of Railways' maintenance department for the valve: that is, no maintenance requirements, the valve runs ≥ 300,000 kilometers, and the service life of the valve It is required to reach the target value of 800,000 kilometers ± 100,000 kilometers for locomotive overhaul

Method used

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  • Reinforcing air intake valve for diesel engine of diesel locomotive and its manufacture

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Effect test

Embodiment 1

[0022] The manufacturing material of the highly strengthened intake valve of the diesel engine of the diesel locomotive of the present invention is strengthened strong martensitic steel MS41, and its chemical composition specification (wt%) can be selected as: C: 0.35 / 0.4; Si: 2.5 / 2.6; Mn: 0.45 / 0.6; Ni≤0.50; Cr: 10 / 10.5; S≤0.002; P≤0.003; Mo: 0.25 / 0.3; the rest is Fe.

Embodiment 2

[0024] The manufacturing material of the high-strengthened intake valve for diesel locomotive engine of the present invention is strengthened strong martensitic steel MS41, and its chemical composition specification (wt%) can be selected as: C: 0.4 / 0.45; Si: 2.6 / 2.8; Mn: 0.35 / 0.45; Ni≤0.50; Cr: 8.5 / 9.5; S≤0.002; P≤0.003; Mo: 0.3; the rest is Fe.

Embodiment 3

[0026] The manufacturing material of the highly strengthened intake valve of the diesel engine of the diesel locomotive of the present invention is strengthened strong martensitic steel MS41, and its chemical composition specification (wt%) can be selected as: C: 0.4 / 0.5; Si: 2.9 / 3.6; Mn: 0.35 / 0.4; Ni≤0.50; Cr: 9.5 / 10.5; S≤0.002; P≤0.003; Mo: 0.2 / 0.25; the rest is Fe.

[0027] Under the chemical composition ratio of any of the above-mentioned embodiments, the manufacturing method of the high-strength intake valve for diesel locomotive diesel engine is: material preparation→valve blank electrothermal upsetting forming→heat treatment→machining

[0028] 1. Material preparation: cut the polished bar into a fixed length, and make a specific R at the deformed end

[0029] 2. Electrothermal upsetting of valve blanks: During electrothermal upsetting, the forming temperature of valve bulbs is 1050°C-1100°C, the deformation speed of bulbs is 1.5-2mm / s, and the initial forging temperatur...

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Abstract

The reinforcing air intake valve for diesel engine of diesel locomotive is manufactured with reinforced martensite steel comprising C 0.38-0.50 wt%, Si 2.50-3.75 wt%, Mn less than or equal to 0.80 wt%, Ni less than or equal to 0.50, Cr 8.5-11.0 wt%, S less than or equal to 0.002 wt%, P less than or equal to 0.003 wt%, Mo 0.2-0.3 wt% other than Fe. The gate material has good performance and machinability, stable quality and high performance / cost ratio. The gate after heat treatment has high strength, excellent comprehensive performance, high roughness and good fitting with plastic.

Description

technical field [0001] The invention relates to an intake valve, in particular to a high-strength intake valve for a diesel engine of a gas-fired locomotive and a manufacturing method thereof. Background technique [0002] The intake valve of the valve train of diesel locomotive diesel engine is an important moving part of the engine. Its service conditions are harsh and the working environment is harsh. Therefore, the valve is required to have excellent comprehensive performance, not only high temperature strength and thermal stability, but also Excellent high temperature gas corrosion resistance, oxidation resistance and wear resistance, the comprehensive manifestation of the above properties basically depends on the structure, material properties and manufacturing methods of the valve. The performance of the valve directly affects the power performance, service life and reliability of the main engine. The destructive failure of the valve during locomotive operation will ...

Claims

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Application Information

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IPC IPC(8): C22C38/44F01L3/02F01L3/06
CPCY02T10/12
Inventor 张绵胜姚正刚张志勇
Owner BEIJING TEYE IND & TRADE
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