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High-counter-pressure casting method for high-tensile and high-density aluminum silicon alloy

An aluminum-silicon alloy and differential pressure casting machine technology, which is applied in the field of casting technology and alloy preparation, can solve the problems that it is difficult to meet the production of high mechanical properties and high-density castings, and the improvement of casting density and internal quality is limited, so as to achieve solidification The effect of speeding up, improving mechanical properties and density, and improving feeding ability

Inactive Publication Date: 2011-01-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional differential pressure casting technology has limited improvement of casting density and internal quality, and it is difficult to meet the requirements of producing high mechanical properties and high density castings, and then provide a high strength, toughness and high density aluminum High pressure differential pressure casting method of silicon alloy

Method used

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  • High-counter-pressure casting method for high-tensile and high-density aluminum silicon alloy
  • High-counter-pressure casting method for high-tensile and high-density aluminum silicon alloy
  • High-counter-pressure casting method for high-tensile and high-density aluminum silicon alloy

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specific Embodiment approach 1

[0017] Specific implementation mode 1: The steps of a high-pressure differential pressure casting method for a high-strength, toughness and high-density aluminum-silicon alloy in this embodiment are:

[0018] Step 1: Adjust the differential pressure casting machine: increase the thickness of the upper and lower working tank walls of the differential pressure casting machine to 14mm respectively, adjust the low-pressure air valve of the air circuit control system to a high-pressure air valve, and adjust the locking force of the locking ring Make the working pressure of the differential pressure casting machine reach 3.0MPa, forming a high pressure differential pressure casting machine;

[0019] Step 2: Preparation of Al-Si Alloy:

[0020] a. Weigh high-strength, toughness and high-density aluminum-silicon alloy raw materials: Weigh 32.3% to 43.2% of high-purity aluminum with a mass purity of 99.99wt%, 0.4% to 0.6% of high-purity magnesium with a mass purity of 99.99wt%, and 54....

specific Embodiment approach 2

[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in the a of step two, 35.3% of the mass purity is 99.99wt% high-purity aluminum, 0.6% of the mass purity is 99.99wt% high-purity magnesium, 60.6% Al-12Si master alloy, 0.5% Al-10Sr master alloy and 3% Al-5Ti-1B master alloy. Compared with ordinary differential pressure casting, the aluminum-silicon alloy obtained under high differential pressure in this embodiment has a further reduced grain size, a further increased density of the aluminum-silicon alloy, improved density, and improved mechanical properties of the casting. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0029]Specific embodiment three: the difference between this embodiment and specific embodiment one is that in the a of step two, 38.5% of the mass purity is 99.99wt% high-purity aluminum, 0.5% of the mass purity is 99.99wt% high-purity magnesium, 57.6% Al-12Si master alloy, 0.4% Al-10Sr master alloy and 3% Al-5Ti-1B master alloy. Compared with ordinary differential pressure casting, the aluminum-silicon alloy obtained under high differential pressure in this embodiment has a further reduced grain size, a further increased density of the aluminum-silicon alloy, improved density, and improved mechanical properties of the casting. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention provides a high-counter-pressure casting method for a high-tensile and heavy aluminum silicon alloy, which relates to a counter-pressure casting method for the high-tensile and high-density aluminum silicon alloy. The invention solves the problem that the conventional counter-pressure casting technology cannot meet the requirement of producing castings with high mechanical propertiesand high density due to the limit on the density and internal quality increase of the castings. The invention has the following main steps of: regulating a counter-pressure casting machine to an operating bearing pressure of 3.0 MPa, preparing aluminum silicon alloy, controlling the temperature of the fusant after thinning and modification at 720 DEG C to 740 DEG C, and carrying out the liquid lifting, mold filling, pressurization, pressure maintaining and pressure relief of high-counter-pressure casting with the counter-pressure casting machine. The invention obviously eliminates internal pinholes, micro-shrinkage porosity and tiny cracks in the castings, and enhances the mechanical properties and density of the castings; because of small thermal resistance between the fusant and the mold wall, the setting rate of the castings accelerates, and the setting structure is obviously thinned, thereby further enhancing the mechanical properties of the castings. The method is especially suitable for the cast form of large-sized complex thin-wall parts.

Description

technical field [0001] The invention relates to a differential pressure casting method of a high-strength, toughness and high-density aluminum-silicon alloy, which belongs to the technical fields of casting technology and alloy preparation. Background technique [0002] Cast aluminum-silicon alloy not only has excellent casting performance, fatigue resistance and corrosion resistance, but also has high comprehensive mechanical properties, so it is widely used in aviation, aerospace and automobile industries. Differential pressure casting, as an advanced casting molding process for the production of large thin-walled parts, has received more and more attention. During differential pressure casting, the molten metal has a high filling capacity, and at the same time, the molten metal solidifies under a certain pressure, which improves the The density and mechanical properties of castings can meet the general performance requirements of casting manufacturing. [0003] In recent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D17/00
Inventor 李豹王宏伟邹鹑鸣朱兆军魏尊杰
Owner HARBIN INST OF TECH
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