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Method for manufacturing compound piston blank used for internal combustion engine

A composite, internal combustion engine technology, applied in the field of automobile manufacturing, can solve the problems of complex manufacturing process, high cost, and many processes, and achieve the effects of light weight, low cost and simple process

Active Publication Date: 2014-07-02
SHANGHAI JIAOTONG 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 casting steel top aluminum skirt compound piston. The material used for the top of the piston is cast steel, and its composition is, by mass%, C: 0.5-0.8%, Si: 3%, Mn: 3% or less, S: 0.2% or less, Ni: 10% or less, Cr: 7-10%, Cu: 6% or less, Nb: 0.05-8%, the remainder is composed of iron and inevitable 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%, the remainder is composed of aluminum and inevitable impurities.

[0022] The specific steps of this embodiment are as follows: (1) Prepare the melt of the above two alloys and prepare for pouring. The casting temperature of the alloy melt used to prepare the top of the piston is 1590-1610°C, and the casting temperature of the alloy melt used to prepare the piston skirt is 740-780°C. (2) When pouring, gravity casting is used, and the t...

Embodiment 2

[0025] Gravity casting aluminum top magnesium skirt compound 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%, the remainder is composed of aluminum and unavoidable impurities. The material used for the piston skirt is a heat-resistant magnesium alloy with high rare earth content. Its composition is, in mass %, containing Y: 12-14%, Gd: 4-8%, Zn: 0.5-2%, Zr: 0.2- 0.6%, the remainder is composed of magnesium and unavoidable impurities.

[0026] The specific steps of this embodiment are as follows: (1) Prepare the above two alloy melts and prepare them for pouring. The casting temperature of the alloy melt used to prepare the top of the piston is 740-780°C, and the casting temperature of the alloy melt used to prepare the piston skirt is 720-760°C. (2) When pouring, the gravity casting method i...

Embodiment 3

[0029] Squeeze cast aluminum top magnesium skirt compound 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%, the remainder is composed of aluminum and inevitable impurities. The material used for the piston skirt is a heat-resistant magnesium alloy with high rare earth content. Its composition is, in mass %, containing Y: 12-14%, Gd: 4-8%, Zn: 0.5-2%, Zr: 0.2- 0.6%, the remainder is composed of magnesium and unavoidable impurities.

[0030] The specific steps of this embodiment are as follows: (1) Prepare the above two alloy melts and prepare them for pouring. The casting temperature of the alloy melt used to prepare the top of the piston is 720-760°C, and the casting temperature of the alloy melt used to prepare the piston skirt is 710-750°C. (2) When pouring, the squeeze casting method is adopte...

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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 most powerful components in internal combustion engines. Due to its extremely harsh working conditions, its working capacity has a significant 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, which has high working temperature and large thermal load; the piston skirt plays a role of guiding and transmitting power. Generally, the temperature at the top of the piston can reach above 300°C, the first ring groove of a gasoline engine piston may be in the range of 260°C, and the first ring groove of a diesel engine piston may exceed 315°C. With the advancement of engine technology, its power continu...

Claims

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Application Information

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