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Method of forming thixotropic soft core of aluminum-steel bimetal member through composite forging

A forging forming, bi-metal technology, applied in metal processing equipment, manufacturing tools, forging/pressing/hammer devices, etc., can solve the problems of uncoordinated deformation of aluminum-steel, interface cracks of aluminum-steel, inability to obtain metallurgical interface, etc. Element diffusion and reaction, improving the uniformity of microstructure and properties, and the effect of reliable and stable metallurgical interface

Active Publication Date: 2019-05-28
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the conventional aluminum-steel composite forging technology mainly faces several problems. First, the deformation of aluminum and steel is not coordinated. Both metals of aluminum and steel adopt thermoplastic forming technology. The aluminum alloy core still has a large deformation resistance, resulting in deformation of steel and aluminum. Out of synchronization, which in turn causes the steel layer to have serious uneven thickness, folding, local damage and other defects; second, the poor bonding of the aluminum-steel interface, due to the large difference in thermal expansion coefficient between steel and aluminum alloy, it is easy to cause cracks at the aluminum-steel interface. , because a dense oxide film is easy to form on the surface of aluminum, it is difficult to effectively break the oxide film in the conventional composite forging process, so that a reliable metallurgical interface cannot be obtained, which seriously affects the bonding performance of the interface

Method used

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  • Method of forming thixotropic soft core of aluminum-steel bimetal member through composite forging
  • Method of forming thixotropic soft core of aluminum-steel bimetal member through composite forging
  • Method of forming thixotropic soft core of aluminum-steel bimetal member through composite forging

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Step 1: Prepare a mold for composite forging and forming aluminum-steel bimetal components, the mold includes a mold cavity 8, and the shape of the mold cavity 8 is gear-shaped;

[0049] Step 2: Process the 7075 aluminum alloy bar stock into a cylinder with a diameter of 35 mm and a height of 58 mm, as the aluminum alloy core 5, process the 45# steel pipe into an outer diameter of 45 mm, a wall thickness of 4 mm, and a height of 50 mm The torus of millimeter, as steel sleeve 6;

[0050] Step 3: using an infrared heating furnace to heat the aluminum alloy core body 5 to 620°C and keep it warm for 30 minutes, so that the aluminum alloy core body 5 is transformed into a semi-solid state with a liquid phase rate of 40%;

[0051] Step 4: During the heat preservation in step 3 for about 25 minutes, use an electromagnetic induction heating furnace to heat the steel jacket 6 to 1000°C, use an infrared thermometer to monitor the steel jacket 6 in real time, and feed back the tem...

Embodiment 2

[0056] Step 1: Prepare a mold for composite forging and forming aluminum-steel bimetal components, the mold includes a mold cavity 8, and the shape of the mold cavity 8 is gear-shaped;

[0057] Step 2: Process the 2024 aluminum alloy bar into a cylinder with a diameter of 35 mm and a height of 58 mm as the aluminum alloy core 5, and process the 304 stainless steel pipe into an outer diameter of 45 mm, a wall thickness of 4 mm, and a height of 50 mm The torus, as the steel sleeve 6;

[0058] Step 3: using an infrared heating furnace to heat the aluminum alloy core body 5 to 630° C. and keep it warm for 30 minutes, so that the aluminum alloy core body 5 is transformed into a semi-solid state with a liquid phase ratio of 40%;

[0059] Step 4: During the heat preservation in step 3 for about 25 minutes, use an electromagnetic induction heating furnace to heat the steel jacket 6 to 900°C, use an infrared thermometer to monitor the steel jacket 6 in real time, and feed back the temp...

Embodiment 3

[0064] Step 1: Prepare a mold for composite forging and forming aluminum-steel bimetal components, the mold includes a mold cavity 8, and the shape of the mold cavity 8 is gear-shaped;

[0065] Step 2: Process the 6061 aluminum alloy bar stock into a cylinder with a diameter of 35 mm and a height of 58 mm as the aluminum alloy core 5, and process the 40CrMo pipe into a cylinder with an outer diameter of 45 mm and a wall thickness of 4 mm and a height of 50 mm. Torus, as steel sleeve 6;

[0066] Step 3: using an infrared heating furnace to heat the aluminum alloy core body 5 to 630° C. and keep it warm for 30 minutes, so that the aluminum alloy core body 5 is transformed into a semi-solid state with a liquid phase ratio of 40%;

[0067] Step 4: During the heat preservation in step 3 for about 25 minutes, use an electromagnetic induction heating furnace to heat the steel jacket 6 to 1000°C, use an infrared thermometer to monitor the steel jacket 6 in real time, and feed back the...

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Abstract

The invention discloses a method of forming a thixotropic soft core of an aluminum-steel bimetal member through composite forging. The method comprises the following steps of: firstly manufacturing analuminum alloy core body and a steel sleeve which have certain sizes and shapes, heating the aluminum alloy core body and carrying out heat preservation until the aluminum alloy core body is in a semi-solid texture state, heating the steel sleeve until the steel sleeve is in a thermoplastic state, quickly guiding the aluminum alloy core body and the steel sleeve into a mold, and assembling to complete the composite forging. By utilizing the good fluidity of the aluminum alloy in the semi-solid state, the coordinated deformation of the aluminum alloy core body and the steel sleeve is realized,so that the composite member is more precisely formed; in addition, a liquid phase portion in the semi-solid aluminum alloy core body reacts with the steel sleeve to form a stable interface with highbonding strength. The metallurgical combination of aluminum-steel bimetal coordinated deformation and interface reliability is realized; and the high-performance advantage of steel and the lightweight advantage of the aluminum alloy are effectively integrated.

Description

technical field [0001] The invention relates to a forming method of a bimetal component in the technical field of material processing, in particular to a thixotropic soft core composite forging forming method of an aluminum-steel bimetal component. Background technique [0002] With the increasingly severe energy supply, more and more countries around the world pay more and more attention to green environmental protection, energy saving and emission reduction. Among them, lightweight materials and their molding manufacturing technology are of great significance to modern industry, and have been used in the automotive industry and weaponry, etc. fields are widely used. [0003] Aluminum-steel composite is an important lightweight method, which is manufactured by composite forging process of steel layer and aluminum core. Steel materials are used for the outer layer of the composite component due to high performance requirements, and aluminum alloy material is used for the in...

Claims

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Application Information

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IPC IPC(8): B21J5/02B21J13/02B21J1/06
Inventor 陈刚张顺常旭升陈强张鸿名韩飞赵祖德
Owner HARBIN INST OF TECH AT WEIHAI
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