Steel piston and preparation method thereof

A piston and steel technology, applied in the field of steel piston and its preparation, can solve the problems of uneven temperature distribution, serious heating, poor heat dissipation conditions, etc.

Active Publication Date: 2021-04-27
中内凯思汽车新动力系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The top of the piston is an integral part of the combustion chamber. It bears alternating mechanical loads and thermal loads during work, and is exposed to high temperature, high pressure, high speed, and poor lubrication conditions for a long time. It is in direct contact with high temperature gas. The instantaneous temperature can reach above 2500K. The heat is severe and the heat dissipation conditions are poor, resulting in a high temperature when the piston is working, and its top is as high as 600-700K, and the temperature distribution is very uneven

Method used

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  • Steel piston and preparation method thereof
  • Steel piston and preparation method thereof
  • Steel piston and preparation method thereof

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preparation example Construction

[0048] Based on the composition and percentage of the above-mentioned steel piston, the present invention also provides a preparation method of the steel piston, comprising the steps of:

[0049] S01: Preparation of alloy rods

[0050] After mixing carbon source, silicon source, phosphorus source, sulfur source, manganese source, copper source, nitrogen source, vanadium source, titanium source and iron source, the alloy bar is obtained through smelting, deoxidation and hot rolling.

[0051] In this case, there are no special restrictions on the types and sources of carbon sources, silicon sources, phosphorus sources, sulfur sources, manganese sources, copper sources, and iron sources. The raw materials for low-alloy steel smelting well known to those skilled in the art can be used. Elemental material of composition. The amount ratio of carbon source, silicon source, phosphorus source, sulfur source, manganese source, copper source, nitrogen source, vanadium source, titanium s...

Embodiment 1

[0082] Mix carbon, silicon, phosphorus, sulfur, manganese, copper, vanadium, titanium, nitrogen and iron, and accurately weigh each raw material for smelting. The smelting temperature is 1600-1620°C. After smelting, the obtained alloy liquid is blown with oxygen. Make slagging to reduce phosphorus, sulfur and other elements to the required composition range, and carry out slagging treatment, continuous casting and rolling, rolling temperature 1150 ~ 1250 ℃, air cooling to room temperature after rolling.

[0083] The alloy bar is divided into blanks of predetermined specifications, which are forged into piston heads and piston skirts. During this process, the heating temperature of the forging billet is 1200-1300°C. The final forging temperature in the forging process is 1100-1200°C, and the preheating temperature of the mold during the forging process is 200-300°C.

[0084] In the cooling process after forging of the present invention, the method for controlling cooling is: ...

Embodiment 2

[0102] Mix carbon, silicon, phosphorus, sulfur, manganese, copper, lead and iron, and accurately weigh each raw material for smelting. The smelting temperature is 1580-1600°C. Phosphorus, sulfur and other elements are reduced to the required composition range, and the slag removal treatment is carried out, and continuous casting and rolling are carried out. The rolling temperature is 1150-1250 ° C. After rolling, it is air-cooled to room temperature.

[0103] In this embodiment, the blanks of the piston head and the piston skirt are forged. The heating temperature of forging blank is 1200~1300℃. The final forging temperature in the forging process is 1100-1200°C. The preheating temperature of the mold during the forging process is 200-300°C.

[0104] In the cooling process after embodiment forging, the method for controlling cooling is:

[0105] Rapid cooling of the forged blank to 600-650°C by means of spray cooling, and then air cooling to room temperature to obtain steel...

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Abstract

The invention provides a steel piston, the composition and weight percentage of which are: C: 0.3-0.45wt%, Si: 0.5-1.0wt%, P: 0-0.025wt%, S: 0.02-0.1wt%, Mn: 1.2~2.0wt%, Cu: 0.1~1.0wt%, N: 0.01~0.05wt%, V: 0.08~0.2wt%, Ti: 0.01~0.03wt%, Al: 0.01~0.03wt%, others The content is Fe; the hardness is 250-310HBW; the matrix structure is composed of fine flaky pearlite + ferrite + no more than 10% of bainite, martensite and retained austenite; the grain size of reticulated ferrite is larger than level 4. By adjusting the ratio of various components, the tensile strength and yield strength of the steel piston can be improved, and the plasticity of the steel piston can be improved. The interlamellar spacing between pearlite can be reduced by controlling the Mn content, and the combination of Mn and S Improve the cutting performance of steel pistons and reduce processing costs. The invention also provides a preparation method of the steel piston.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a steel piston and a preparation method thereof. Background technique [0002] With the continuous improvement of engine power and explosion pressure, higher requirements are put forward for the engine and its spare parts. As the key component of the A-level engine, the piston is used to withstand the gas pressure and drive the crankshaft to rotate through the connecting rod through the piston pin. [0003] The top of the piston is an integral part of the combustion chamber. It bears alternating mechanical loads and thermal loads during work, and is exposed to high temperature, high pressure, high speed, and poor lubrication conditions for a long time. It is in direct contact with high temperature gas. The instantaneous temperature can reach above 2500K. The heat is severe, and the heat dissipation condition is very poor, so the temperature of the piston is very high when it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/60C22C38/04C22C38/16C22C38/12C22C38/14C22C38/06F02F3/00B23P15/10
CPCB23P15/10C21D2211/001C21D2211/002C21D2211/005C21D2211/008C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16C22C38/60F02F3/0084
Inventor 薛亚辉张亮亮刘亚辉汤健王鹏菲张传珍
Owner 中内凯思汽车新动力系统有限公司
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