A high-pressure differential pressure forming method for large thin-walled SIC-reinforced 2014 aluminum alloy matrix composite castings

A technology of aluminum alloy base and composite materials, which is applied in the field of high-pressure differential pressure forming, can solve the problems of micro-crack sources and uneven distribution of SiC reinforcement, and achieve the effect of improving uniformity, eliminating micro-crack sources, and achieving uniform distribution

Active Publication Date: 2020-05-22
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem of uneven distribution of SiC reinforcement in the forming process of existing large thin-walled SiC-reinforced 2014 aluminum alloy-based composite material castings, and the problem that micro-cracks are generated at the parts where SiC is concentrated due to mutual contact between particles, and further proposes a large-scale thin-walled High pressure differential pressure forming method of SiC reinforced 2014 aluminum alloy matrix composite casting

Method used

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  • A high-pressure differential pressure forming method for large thin-walled SIC-reinforced 2014 aluminum alloy matrix composite castings
  • A high-pressure differential pressure forming method for large thin-walled SIC-reinforced 2014 aluminum alloy matrix composite castings

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specific Embodiment approach 1

[0020] Specific Embodiment 1: In this embodiment, a high pressure differential pressure forming method for a large thin-walled SiC reinforced 2014 aluminum alloy matrix composite material casting is carried out according to the following steps:

[0021] Step 1. Take the SiC-reinforced 2014 aluminum alloy-based composite material and divide it into two parts, A and B, wherein part A accounts for 30% of the total weight of the SiC-reinforced 2014 aluminum-alloy-based composite material, and the rest is part B;

[0022] Step 2. Put part A in the crucible of the lower pressure tank of the anti-gravity forming device, and when it melts to 740°C, add part B, control the melt temperature at 700°C, and keep it warm for 20 minutes;

[0023] Step 3, then close the lower pressure tank, insert the riser pipe into the crucible, place and lock the mold, install the upper pressure tank and close it;

[0024] Step 4. Open the communication valve between the upper pressure tank and the lower p...

specific Embodiment approach 2

[0029] Specific implementation mode two: In this implementation mode, a high-pressure differential pressure forming method of a large thin-walled SiC reinforced 2014 aluminum alloy matrix composite material casting is carried out according to the following steps:

[0030] Step 1. Take the SiC-reinforced 2014 aluminum alloy-based composite material and divide it into two parts, A and B, wherein part A accounts for 40% of the total weight of the SiC-reinforced 2014 aluminum-alloy-based composite material, and the rest is part B;

[0031] Step 2. Put part A in the crucible of the lower pressure tank of the anti-gravity forming device, and when it melts to 720°C, add part B, control the melt temperature at 690°C, and keep it warm for 40 minutes;

[0032] Step 3, then close the lower pressure tank, insert the riser pipe into the crucible, place and lock the mold, install the upper pressure tank and close it;

[0033] Step 4. Open the communication valve between the upper pressure t...

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Abstract

The invention discloses a high-pressure differential pressure forming method for a large thin-walled SiC enhanced 2014 aluminum alloy-based composite casting, relates to a high-pressure differential pressure forming method and aims to solve the problem of penetrative cracks of an existing large thin-walled SiC enhanced 2014 aluminum alloy-based composite casting. The high-pressure differential pressure forming method comprises the steps that firstly, a SiC enhanced 2014 aluminum alloy-based composite is divided into a part A and a part B; secondly, when the part A is melted to 720 DEG C-740 DEG C, the part B is added, and the melt temperature is controlled to keep warm; thirdly, a lower pressure tank is closed, a liquid rising pipe is inserted into a crucible, a casting mold is put and locked, and an upper pressure tank is installed and closed; fourthly, an interflow valve between the upper pressure tank and the lower pressure tank is opened, meanwhile, high-pressure gas is fed into the lower pressure tank until the pressure in the tank reaches 1.8 MPa-3.2 MPa, and the interflow valve is closed; and fifthly, the upper pressure tank is controlled to exhaust gas, and differential pressure casting forming is carried out. The uniformity degree of SiC particle distribution of the casting acquired through the method is increased by 70% or above.

Description

technical field [0001] The invention relates to a high-pressure differential pressure forming method; in particular, it relates to a high-pressure differential pressure forming method for a large thin-walled SiC reinforced 2014 aluminum alloy-based composite material casting. Background technique [0002] Large thin-walled SiC reinforced 2014 aluminum alloy matrix composite castings are widely used in ships, underwater and military industries. Its manufacturing process involves casting, machining and other processing processes. Since the SiC reinforced 2014 aluminum alloy matrix composite material has strong cutting resistance, reducing the machining process can significantly reduce the cost and manufacturing difficulty. Therefore, the wall thickness of the casting is generally designed relatively Thin, because of its thinner wall thickness, the difficulty of casting is more prominent. The main problem at present is that the distribution of SiC reinforcement is not uniform. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/04C22C21/00C22C32/00
CPCB22D18/04C22C21/00C22C32/0063
Inventor 邹鹑鸣张荣王志刚刘闯魏尊杰王宏伟
Owner HARBIN INST OF TECH
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