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High-pressure differential pressure forming method for large thin-walled SiC enhanced 2014 aluminum alloy-based composite casting

An aluminum alloy-based and composite material technology, applied in the field of high pressure differential pressure forming, can solve the problems of uneven distribution of SiC reinforcement, micro-crack sources, etc., and achieve the effects of eliminating micro-crack sources, improving uniformity, and strong squeezing effect.

Active Publication Date: 2018-08-28
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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  • High-pressure differential pressure forming method for large thin-walled SiC enhanced 2014 aluminum alloy-based composite casting
  • High-pressure differential pressure forming method for large thin-walled SiC enhanced 2014 aluminum alloy-based composite casting

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specific Embodiment approach 1

[0020] Embodiment 1: The high pressure differential pressure forming method of a large-scale thin-walled SiC reinforced 2014 aluminum alloy matrix composite casting in this embodiment is carried out according to the following steps:

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

[0022] Step 2, placing part A in the crucible of the lower pressure tank of the anti-gravity forming device, when melting to 740°C, adding part B, controlling the melt temperature at 700°C, and maintaining the temperature for 20min;

[0023] Step 3. Then close the lower pressure tank, insert the liquid riser into the crucible, place and lock the casting mold, install the upper pressure tank and seal;

[0024] Step 4: Open the intercommunication valve between the upper pressure...

specific Embodiment approach 2

[0029] Specific embodiment 2: The high pressure differential pressure forming method of a large-scale thin-walled SiC reinforced 2014 aluminum alloy matrix composite casting in this embodiment is carried out according to the following steps:

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

[0031] Step 2, placing part A in the crucible of the lower pressure tank of the antigravity forming device, when melting to 720°C, adding part B, controlling the melt temperature at 690°C, and maintaining the temperature for 40min;

[0032] Step 3. Then close the lower pressure tank, insert the liquid riser into the crucible, place and lock the casting mold, install the upper pressure tank and seal;

[0033] Step 4: Open the intercommunication valve between the upper ...

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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 to a high-pressure differential pressure forming method for a large-scale thin-walled SiC reinforced 2014 aluminum alloy matrix 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. The processing and manufacturing process involves casting, machining and other processing processes. Due to the strong cutting resistance of SiC-reinforced 2014 aluminum alloy matrix composites, reducing the machining process can significantly reduce the cost and manufacturing difficulty. Therefore, the wall thickness of the casting is generally designed to be larger. Thin, due to its thin wall thickness, the casting difficulty is more prominent. The main problem currently faced is that the distribution of SiC reinforcement is not uniform, ...

Claims

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Application Information

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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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