Method for manufacturing compound piston blank used for internal combustion engine

A manufacturing method and composite technology, applied in the field of automobile manufacturing, can solve the problems of high cost, many processes, and complicated manufacturing process, and achieve the effect of light weight, simple process, and low cost

Active Publication Date: 2011-10-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two methods can meet the requirements of increasing strength and reducing weight at the same time, the manufacturing process is complicated, there are many processes, and the cost is also high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Gravity cast steel top aluminum skirt composite piston. The material used for the top of the piston is cast steel, and its composition is, by mass %, containing C: 0.5-0.8%, Si: 3%, Mn: less than 3%, S: less than 0.2%, Ni: less than 10%, Cr: 7-10%, Cu: 6% or less, Nb: 0.05-8%, and the remainder is composed of iron and unavoidable impurities. The material used for the piston skirt is AC8A eutectic aluminum-silicon alloy, and its composition is, by mass%, containing Cu: 0.8-1.3%, Si: 11-13%, Mg: 0.47-1.30%, Zn: 0.1%, Fe : 0.8%, Mn: 0.1%, Ni: 1.0-2.5%, Ti: 0.2%, and the rest is composed of aluminum and unavoidable impurities.

[0022] The concrete steps of this embodiment are: (1) make the melt of above-mentioned two kinds of alloys, prepare to cast. The pouring temperature of the alloy melt used to prepare the piston top is 1590-1610°C, and the pouring temperature of the alloy melt used to prepare the piston skirt is 740-780°C. (2) When pouring, the gravity casting met...

Embodiment 2

[0025] Gravity cast aluminum top magnesium skirt composite piston. The material used for the top of the piston is AC9B hypereutectic aluminum-silicon alloy, and its composition is, by mass%, containing Cu: 0.5-1.1%, Si: 19-20%, Mg: 0.5-1.5%, Zn: 0.2%, Fe : 0.8%, Mn: 0.5%, Ni: 0.5-1.5%, Ti: 0.2%, and the rest is composed of aluminum and unavoidable impurities. The material used for the piston skirt is heat-resistant magnesium alloy with high rare earth content. 0.6%, the remainder consists of magnesium and unavoidable impurities.

[0026] The concrete steps of this embodiment are: (1) make above-mentioned two kinds of alloy melts, prepare to cast. The pouring temperature of the alloy melt used to prepare the piston top is 740-780°C, and the pouring temperature of the alloy melt used to prepare the piston skirt is 720-760°C. (2) When pouring, adopt the gravity casting method, place the top of the piston mold downward and place it on the bottom of the mold, the skirt of the pist...

Embodiment 3

[0029] Squeeze cast aluminum top magnesium skirt composite piston. The material used for the top of the piston is AC8A eutectic aluminum-silicon alloy, and its composition is, by mass%, containing Cu: 0.8-1.3%, Si: 11-13%, Mg: 0.47-1.30%, Zn: 0.1%, Fe: 0.8%, Mn: 0.1%, Ni: 1.0-2.5%, Ti: 0.2%, and the remainder is composed of aluminum and unavoidable impurities. The material used for the piston skirt is heat-resistant magnesium alloy with high rare earth content. 0.6%, the remainder consists of magnesium and unavoidable impurities.

[0030] The concrete steps of this embodiment are: (1) make above-mentioned two kinds of alloy melts, prepare to cast. The pouring temperature of the alloy melt used to prepare the piston top is 720-760°C, and the pouring temperature of the alloy melt used to prepare the piston skirt is 710-750°C. (2) When pouring, adopt the squeeze casting method, place the top of the piston mold downward and place it on the bottom of the mold, and the skirt of t...

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PUM

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Abstract

The invention relates to a method for manufacturing a compound piston blank used for an internal combustion engine and belongs to the technical field of vehicle manufacturing. In the method, a melt of a cast steel, a AC9B transcocrystallized Al-Si alloy, a AC8A cocrystallized Al-Si alloy, a heat-resistant magnesium alloy with high rare earth content, a heat-resistant rare-earth magnesium alloy or a metallic matrix composite thereof is utilized as a top melt of a piston, and a melt of the AC8A cocrystallized Al-Si alloy, the heat-resistant rare-earth magnesium alloy, a common heat-resistant magnesium alloy or the metallic matrix composite thereof is utilized as a skirt part melt of the piston, wherein the skirt part melt of the piston and the top melt of the piston are made of different materials; and manufacturing the compound piston blank by using a gravity casting method or an extrusion casting method to process the two melts. An end product manufactured by using the method can meet the demands of enhancing the strength, reducing the weight and lowering the cost.

Description

technical field [0001] The invention relates to a manufacturing method in the technical field of automobile manufacturing, in particular to a manufacturing method of a composite piston blank for an internal combustion engine. Background technique [0002] The piston is one of the hardest working parts of an internal combustion engine. Due to its extremely harsh working conditions, its working capacity has a major impact on the strengthening, reliability and durability of the engine. [0003] The top of the piston is in contact with high-temperature and high-pressure gas, so the working temperature is high and the heat load is large; the skirt of the piston plays the role of guiding and transmitting power. Generally, the temperature of the top of the piston can reach above 300°C, the first ring groove bank of the gasoline engine piston may be in the range of 260°C, and the first ring groove bank of the diesel engine piston may exceed 315°C. With the advancement of current e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16
Inventor 王渠东尹冬弟
Owner SHANGHAI JIAO TONG UNIV
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