High-performance engine inlet valve and preparing method thereof

An intake valve and valve technology, applied in engine components, machines/engines, mechanical equipment, etc., can solve problems such as incompetence, and achieve the effect of ensuring high temperature resistance, reducing equipment investment, and excellent high temperature performance

Inactive Publication Date: 2016-02-03
杨秋香
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The valve can serve for a long time at a high temperature above 500°C, but when the performance of the engine is improved and the valve is required to serve at a temperature above 550°C, this material is not competent

Method used

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  • High-performance engine inlet valve and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Prepare the ingredients according to the alloy composition range, C: 0.30%; Si: 0.1%; Mo: 0.17%; Mn: 0.5%; Cr: 1.04%; W: 0.93%; Ce: 0.11%; Nb: 0.06%; Cu: 0.08%. Mix the alloy materials evenly;

[0027] (2) Smelting in a vacuum induction furnace with the temperature controlled at 1650°C for 2.5 hours;

[0028] (3) Perform three forgings at 1100°C, 1050°C, and 950°C respectively, and control the deformation ratio to 70% to obtain the intake valve blank;

[0029] (4) Insulate at 820°C for 1.5h, quench, then heat to 450°C, hold for 2 hours, and finally air cool;

[0030] (5) Remove the surface oxide skin, perform smooth treatment, and then perform surface ultrasonic treatment. Ultrasonic treatment is carried out at room temperature and the frequency is controlled at 30,000 Hz, followed by nitriding treatment at 350°C;

[0031] (6) Use milling machine to process the surface finish of the cone surface;

[0032] (7) Surfacing molybdenum-zirconium alloy on the cone surf...

Embodiment 2

[0035] (1) Prepare the ingredients according to the alloy composition range, C: 0.35%; Si: 0.05%; Mo: 0.14%; Mn: 0.75%; Cr: 0.87%; W: 1.0%; Ce: 0.1%; Nb: 0.1%; Cu: 0.05%. Mix the alloy materials evenly;

[0036] (2) Smelting in a vacuum induction furnace with the temperature controlled at 1650°C for 2 hours;

[0037] (3) Perform three forgings at 1100°C, 1050°C, and 950°C respectively, and control the deformation ratio to 72% to obtain the intake valve blank;

[0038] (4) Insulate at 800°C for 1.5h, quench, then heat to 500°C, hold for 2 hours, and finally air cool;

[0039] (5) Remove the surface oxide skin, perform smooth treatment, and then perform surface ultrasonic treatment. Ultrasonic treatment is carried out at room temperature and the frequency is controlled at 30,000 Hz, and then nitriding treatment is carried out at 330°C;

[0040] (6) Use milling machine to process the surface finish of the cone surface;

[0041] (7) Surfacing molybdenum-zirconium alloy on the co...

Embodiment 3

[0044] (1) Prepare the ingredients according to the alloy composition range, C: 0.40%; Si: 0.065%; Mo: 0.2%; Mn: 0.80%; Cr: 0.80%; W: 0.9%; Ce: 0.2%; Nb: 0.05%; Cu: 0.1%. Mix the alloy materials evenly;

[0045] (2) Smelting in a vacuum induction furnace with the temperature controlled at 1620°C for 2 hours;

[0046] (3) Perform three forgings at 1100°C, 1050°C, and 950°C respectively, and control the deformation ratio to 73% to obtain the intake valve blank;

[0047] (4) Insulate at 850°C for 1 hour, quench, then heat to 500°C, hold for 2.5 hours, and finally air cool;

[0048] (5) Remove the surface oxide skin, perform smooth treatment, and then perform surface ultrasonic treatment. Ultrasonic treatment is carried out at room temperature and the frequency is controlled at 35,000 Hz, followed by nitriding treatment at 360°C;

[0049] (6) Use milling machine to process the surface finish of the cone surface;

[0050] (7) Surfacing molybdenum-zirconium alloy on the cone sur...

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Abstract

The invention discloses an engine inlet valve and a preparing method thereof. The inlet valve is prepared from, by weight percentage, 0.32% to 0.40% of C, 0.17% to 0.37% of Si, 2.5% to 3.5% of Mo, 0.50% to 0.80% of Mn, 0.80% to 1.10% of Cr, 0.50% to 1.0% of W, smaller than or equal to 0.013% of Ni, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, smaller than or equal to 0.010% of Cu and the balance Fe. The inlet valve is manufactured through the processes including surface nanocrystallization, low-temperature nitriding, tungsten and zirconium alloy bead welding and the like. The inlet valve is large in surface strength, high in hardness, good in abrasion resistance and long in service life.

Description

technical field [0001] The invention relates to the field of new materials, in particular to an intake valve and a preparation method thereof. Background technique [0002] The engine is the core component of the locomotive, and the valve is one of the key parts of the engine. The valve is a direct part used to open or close the intake and exhaust passages. Its working environment is harsh and it has high requirements on the performance of the material. 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. In this process, the thermal energy of fuel combustion is converted into mechanical energy. The temperature of the valve head is very high, and it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/16C22C38/12C22C38/02C22C38/04F01L3/02
Inventor 杨秋香
Owner 杨秋香
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