Processing method of sealing surface of exhaust valve of low-speed diesel engine

A processing method and exhaust valve technology, applied in metal processing equipment, manufacturing tools, welding equipment and other directions, can solve the problems of high manufacturing cost, long procurement cycle and parking accidents of the overall nickel-based superalloy, and achieve broad promotion value and Market prospect, extension of overhaul period, effect of manufacturing cost control

Active Publication Date: 2012-08-01
CHONGQING YUEJIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The exhaust valve is the key moving part of the heart of the diesel engine, which determines the performance and reliability of the diesel engine: it is also the basic part of the diesel engine, which plays a very important role in supporting the whole diesel engine; it is also a consumable part, and it needs to be partially disassembled when replacing it Diesel engines are labor-intensive and time-consuming. If they fail during use, they will definitely cause parking accidents. This is absolutely not allowed.
[0003] my country is still quite backward in the design and manufacture of exhaust valves for low-speed diesel engines, and has always relied on imports, with long procurement cycles and high prices.
At present, my country adopts the spray (build-up) welding process for the cone surface of the low-speed diesel engine exhaust valve, and welds a layer of NiCr12B or Stellite 6# alloy to improve the surface hardness of the low-speed diesel engine exhaust valve sealing surface and increase wear resistance. It is limited to increase the hardness of the sealing surface by surfacing welding
At the end of the last century, after the exhaust valve made of integral nickel-based superalloy was used on a two-stroke diesel engine, the overhaul period has easily exceeded 20,000 hours. However, the manufacturing cost of integral nickel-based superalloy is expensive, and its application in the market has certain limitations.

Method used

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  • Processing method of sealing surface of exhaust valve of low-speed diesel engine
  • Processing method of sealing surface of exhaust valve of low-speed diesel engine
  • Processing method of sealing surface of exhaust valve of low-speed diesel engine

Examples

Experimental program
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Effect test

Embodiment 1

[0025] a) Surfacing GH4169, a deformed high-temperature Ni-Cr alloy material containing Nb, in the tapered groove 2 until the tapered groove 2 is filled;

[0026] b) The surfacing alloy surface is an irregular surface, which needs to be turned, so that the surfacing alloy surface is flush with the conical surface 1a of the exhaust valve 1, so as to facilitate subsequent rolling processing;

[0027] c) Carry out rolling processing on the surfacing alloy surface to form three grooves with a depth of 2-2.5mm, and the distance between the corresponding positions of adjacent grooves 3 is 6±0.5mm;

[0028] The rolling equipment used in the rolling process includes a turntable, rolling tools, and a hydraulic press. The axial load of the equipment is ≥15t, and the rolling line speed is ≥50m / min. The rolling tool uses a rotating roller with a diameter of φ160mm. The outer edge of the roller is Symmetrical 90° included angle, the top of the included angle is R2.5 rounded, the rotation s...

Embodiment 2

[0037] Inconel 718, a deformed high-temperature Ni-Cr alloy material containing Nb, has a slight difference in the composition of the alloy material Inconel 718 and GH4169. The alloy material code-named GH4169 is generally used in China, and the alloy material code-named Inconel 718 is generally used abroad. Compared with the embodiment, the method steps and rolling equipment used are mainly different in the secondary age hardening treatment process in step d). The alloy material Inconel 718 is used for the second age hardening treatment. The holding temperature of the first stage is 720°C, the holding time is 8 hours, and the furnace temperature is cooled to 620°C. The holding temperature of the second stage is 620°C, the holding time is 6 hours, and the furnace temperature is cooled. to below 400°C.

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Abstract

The invention discloses a processing method of a sealing surface of an exhaust valve of a low-speed diesel engine, which is characterized in that a deformed and high-temperature Ni-Cr precipitation-hardening alloy containing Nb is utilized to be overlaid in a ring groove of the exhaust valve, and a reticular precipitation tissue with hardness of HV10540-580 is formed through rolling and aging precipitation-hardening processing. By the method, the hardness of the sealing surface is improved; and when in use, the sealing surface has small possibility of cracking, the production cost is controlled effectively, major repair time of the diesel engine is prolonged, and the method has a wide promotion value and market prospect.

Description

technical field [0001] The invention belongs to a production method of an exhaust valve of a low-speed diesel engine, specifically, a method for processing the sealing surface of an exhaust valve of a low-speed diesel engine. Background technique [0002] Low-speed diesel engines are used as the main power of large ships in the world due to their excellent performance, good reliability, convenient use and maintenance, ability to burn low-quality fuel, and low fuel consumption. The exhaust valve is the key moving part of the diesel engine heart, which determines the performance and reliability of the diesel engine: it is also the basic part of the diesel engine, which plays a very important role in supporting the whole diesel engine; it is also a consumable part, which needs to be partially disassembled when replacing Diesel engines are labor-intensive and time-consuming. If a breakdown occurs during use, it will definitely cause a parking accident, which is absolutely not a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B23K31/02B23P9/02C22F1/10
Inventor 张先智陈以建严中明明国建
Owner CHONGQING YUEJIN MACHINERY
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