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A preparation mold for a piston used in a high-power engine and a method for preparing the piston

An engine and high-power technology, used in manufacturing tools, heat treatment equipment, casting and molding equipment, etc., can solve problems such as poor overall performance consistency, achieve the effect of improving piston performance, eliminating pore defects, and promoting density and structure refinement

Active Publication Date: 2020-03-17
XIAN KANGBO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a preparation mold and piston preparation method for high-power engine pistons, so as to overcome the problems of shrinkage, porosity, and poor overall performance consistency in the prior art

Method used

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  • A preparation mold for a piston used in a high-power engine and a method for preparing the piston
  • A preparation mold for a piston used in a high-power engine and a method for preparing the piston
  • A preparation mold for a piston used in a high-power engine and a method for preparing the piston

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The chemical composition of the eutectic Al-Si alloy is by weight percentage:

[0031] Si: 12.5%; Cu: 3%; Ni: 2%; Mg: 1.0%; Mn≤0.5%; Fe: ≤0.3%; Zr: ≤0.3%; Ti: ≤0.3%; V≤0.2; the rest It is aluminum; the chemical composition of the ring aluminizing solution used in the piston preparation process includes aluminum, silicon, and magnesium, and its chemical composition by weight percentage is: Si: 7%, Mg: 0.3%; the rest is aluminum.

[0032] A method for preparing a piston for a high-power engine, comprising the following steps:

[0033] Step 1: Preliminary preparation

[0034] a. Preparation of aluminum alloy melt for piston and ring aluminizing solution: clean the ingot surface of aluminum alloy for piston and aluminizing solution respectively, and melt it in a graphite crucible resistance furnace at 300°C for 4 hours after heat preservation. And adjust the composition of the melt, as well as the process of modification, refining and refinement.

[0035] b. Salt core he...

Embodiment 2

[0042] The chemical composition of the eutectic Al-Si alloy is by weight percentage:

[0043] Si: 11%; Cu: 3.8%; Ni: 2.5%; Mg: 0.7%; Mn≤0.5%; Fe: ≤0.3%; Zr: ≤0.3%; Ti: ≤0.3%; V≤0.2; It is aluminum; the chemical composition of the ring aluminizing solution used in the piston preparation process includes aluminum, silicon, and magnesium, and its chemical composition by weight percentage is: Si: 8%, Mg: 0.5%; the rest is aluminum.

[0044] A method for preparing a piston for a high-power engine, comprising the following steps:

[0045] Step 1: Preliminary preparation

[0046] a. Preparation of aluminum alloy melt for piston and ring aluminizing solution: clean the ingot surface of aluminum alloy for piston and aluminizing solution respectively, and melt it in a graphite crucible resistance furnace at 300°C for 4 hours after heat preservation. And adjust the composition of the melt, as well as the process of modification, refining and refinement.

[0047] b. Salt core heat pres...

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Abstract

The invention provides a preparation mold for a piston for a high-power engine and a piston preparation method. In the prior art, the problems that the casting defects such as shrinkage porosity of the center of the top of a blank are more, more air hole defects exist on the top of a piston, and the performance difference between the skirt part of the piston and the top of the piston is relativelylarge exist. The provided preparation mold comprises a top mold, a side mold and a core mold, a pressure air channel and a dead head structure are arranged in the top mold, and a cooling water channel is formed in each of the side mold and the core mold; and the preparation mold is characterized in that a pressure adjusting device is connected to the pressure air channel in the mold, the coolingwater channel on the side mold is in a wave shape, and an emitting head of an ultrasonic generator is arranged on the core mold. The problems of shrinkage porosity, the air holes and the poor overallperformance consistency in the prior art are well solved.

Description

technical field [0001] The invention belongs to the field of aluminum alloy material forming, and relates to a mold for preparing a piston for a high-power engine and a method for preparing the piston. Background technique [0002] With the development of variable turbocharging technology and high-pressure common rail direct injection technology, the density, power, compactness and thermal load of the engine are getting higher and higher. The temperature rises from 350°C to above 425°C. In order to meet the requirements of use, the piston needs to have higher strength and toughness, high temperature resistance, thermal stability and thermal fatigue resistance. Make higher demands. [0003] The existing high-power engine piston preparation mold includes a top mold, a side mold and a core mold. The piston blank is arranged in the cavity formed by the top mold, the side mold and the core mold. The top mold is provided with a pressure air channel and a riser structure. , The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/22B22D27/18B22D27/15B22D27/13C21D9/00
CPCB22C9/22B22D27/13B22D27/15B22D27/18C21D9/0068
Inventor 郭永春夏峰杨伟杨忠李建平
Owner XIAN KANGBO NEW MATERIAL TECH
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