Method of manufacture reinforcing air intake valve for diesel engine of diesel locomotive

A technology for diesel locomotives and production methods, applied in the direction of internal combustion piston engines, combustion engines, machines/engines, etc., can solve problems such as performance that cannot meet the work requirements, service life that cannot be met, and service life of valves that are lagging behind, so as to achieve excellent performance, Improved wear life and extended maintenance period

Inactive Publication Date: 2006-10-25
BEIJING TEYE IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The destructive failure of the valve during the operation of the locomotive will lead to engine accidents and seriously endanger the operation safety of the locomotive
Dongfeng series diesel locomotives powered by 240 series and 280 series diesel engines are the main driving force for my country's main railway transportation, and occupy an important position in railway transportation. However, the service life of the valves is still at a relatively backward level, and valve early Failure, such as cracks, falling blocks and broken valve accidents, for this reason, the issue of improving the reliability and service life of the valve has received great attention from the railway operation department and the internal combustion engine manufacturing department
[0003] 1. The conical surface of the valve disc is strengthened, and the high-temperature hard surface wear-resistant alloy is clad by the cone welding method (as shown in Figure 1). Not only is the process complicated and the manufacturing is difficult, but it also affects the overall structural performance of the valve. The occurrence of cracks and block drop in the cone welding zone over 150,000 kilometers is also one of the main causes of diesel engine valve accidents, which seriously affects 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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  • Method of manufacture reinforcing air intake valve for diesel engine of diesel locomotive

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Embodiment 1

[0016] The material of the intake valve of the internal combustion engine diesel engine of the present invention is martensitic steel MS41, and its chemical composition standard weight percentage can be selected as: C: 0.35 or 0.4, Si: 2.5 or 2.6, Mn: 0.45 or 0.6, Ni≤0.50, Cr : 10 or 10.5, S ≤ 0.002, P ≤ 0.003, Mo: 0.25 or 0.3, the rest is iron.

Embodiment 2

[0018] The material of the intake valve of the internal combustion engine diesel engine of the present invention is martensitic steel MS41, and its chemical composition standard weight percentage can be selected as: C: 0.4 or 0.45, Si: 2.6 or 2.8, Mn: 0.35 or 0.45, Ni≤0.50, Cr : 8.5 or 9.5, S≤0.002, P≤0.003, Mo: 0.3, the rest is iron.

Embodiment 3

[0020] The material of the intake valve of the internal combustion engine diesel engine of the present invention is martensitic steel MS41, and its chemical composition standard weight percentage can be selected as: C: 0.4 or 0.5, Si: 2.9 or 3.6, Mn: 0.35 or 0.4, Ni≤0.50, Cr : 9.5 or 10.5, S ≤ 0.002, P ≤ 0.003, Mo: 0.2 or 0.25, the rest is iron.

[0021] Under the chemical composition ratio of any of the above-mentioned embodiments, the manufacturing method of the intake valve of the diesel locomotive of the internal combustion engine, its process is: material preparation→valve blank electrothermal upsetting forming→heat treatment→mechanical processing; wherein,

[0022] 1. Preparation: Cut the polished bar into a fixed length, and make the deformed end into a garlic shape.

[0023] 2. The electrothermal upsetting process of the valve blank is as follows: during electrothermal upsetting, the forming temperature of the valve bulb is 1050°C-1100°C, the deformation speed of the b...

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PUM

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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 a method for manufacturing an intake valve, in particular to a method for manufacturing an intake valve for an internal combustion engine diesel locomotive Background technique [0002] The intake valve of the diesel locomotive diesel engine valve train 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 method 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 operatio...

Claims

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Application Information

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