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A method for additive manufacturing of aluminum-magnesium alloy structural parts

An aluminum-magnesium alloy and additive manufacturing technology, which is applied in the direction of manufacturing tools, metal processing equipment, welding equipment, etc., can solve the problems of large residual stress, incomplete penetration, and spheroidization, so as to improve the average tensile strength and save magnesium Aluminum alloy material, the effect of enhancing the bond strength

Active Publication Date: 2019-12-27
常州长东增材制造有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has the advantages of high forming efficiency, low cost, and compact parts. Scientific research institutions around the world have conducted a lot of research on it. According to the different cladding processes of additive manufacturing, it can be divided into laser welding (LAW) and plasma arc welding (PAW). , gas metal arc welding (GMAW), non-gas metal arc welding (GTAW), electron beam welding (EBW), etc. Compared with other additive manufacturing technologies, arc welding additive manufacturing technology has low cost, high efficiency, There are many controllable parameters, good mechanical properties, good applicability of metal materials, etc., but there are still some problems that need to be solved: there is a certain gap between the forming accuracy and the net shape parts, the residual stress is large, and the controllability of the molten pool is not good. , lack of special molding materials and poor working environment
However, the main problem of the additive manufacturing of aluminum-magnesium alloys is: due to the unclean cleaning of the substrate and the surface of the aluminum-magnesium alloy wire, the heating and cooling speed during the welding process is too fast, so that the H+ in the molten pool cannot completely escape, and it is easy to Form hydrogen pores; in addition, the chemical combination of aluminum and oxygen is very strong, and it is easy to form a thin oxide film (Al2O3) on the surface. Due to the high melting point of the oxide film (2050 ° C), the bonding cannot be carried out normally. It hinders the good combination between metals and easily produces incomplete penetration defects, which leads to poor forming quality of aluminum-magnesium alloy products formed by laser additive manufacturing technology, and is prone to defects such as spheroidization, pores, slag inclusions, and cracks

Method used

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  • A method for additive manufacturing of aluminum-magnesium alloy structural parts
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Examples

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Embodiment 1

[0028] A method for additive manufacturing of aluminum-magnesium alloy structural parts, specifically comprising the following steps:

[0029] (1) Substrate pretreatment: Firstly, the aluminum alloy substrate material is ground and polished with sandpaper, and then, at a temperature of 40° C., a hydrofluoric acid solution with a concentration of 3% and a sulfuric acid solution with a concentration of 8% are used in a mass ratio of 1 : Clean with an acid solution composed of 3 for 20-30 minutes, then wash it with water, then put it into acetone, ethanol and ultrapure water for 5-10 minutes to ultrasonically clean it in order to remove surface impurities, take it out and dry it, and use laser marking machine to process the surface microstructure to form a truss-shaped microstructure with a pitch of 50 μm, ready for use;

[0030] (2) Preparation of aluminum-magnesium alloy wire: 1. the mass fraction is 8% of pure magnesium ingot, 70% of aluminum powder, and 22% of iron-based allo...

Embodiment 2

[0035] A method for additive manufacturing of aluminum-magnesium alloy structural parts, specifically comprising the following steps:

[0036] (1) Substrate pretreatment: Firstly, the aluminum alloy substrate material is ground and polished with sandpaper, and then, at a temperature of 30° C., with a hydrofluoric acid solution with a concentration of 3% and a sulfuric acid solution with a concentration of 8% in a mass ratio of 1 : Wash with acid solution composed of 3 for 20-30 minutes, then wash with water, then put it into acetone, ethanol and ultrapure water for 5-10 minutes to ultrasonically clean it in order to remove surface impurities, take it out and dry it, and use laser marking The surface microstructure is processed by a machine to form a truss-shaped microstructure with a spacing of 100 μm, which is ready for use;

[0037] (2) Preparation of aluminum-magnesium alloy wire: 1. the mass fraction is 5% of pure magnesium ingot, 65% of aluminum powder, and 30% of iron-ba...

Embodiment 3

[0042] A method for additive manufacturing of aluminum-magnesium alloy structural parts, specifically comprising the following steps:

[0043] (1) Substrate pretreatment: Firstly, the aluminum alloy substrate material is ground and polished with sandpaper, and then, at a temperature of 50° C., use a hydrofluoric acid solution with a concentration of 3% and a sulfuric acid solution with a concentration of 8% in a mass ratio of 1 : Clean with an acid solution composed of 3 for 20-30 minutes, then wash it with water, then put it into acetone, ethanol and ultrapure water for 5-10 minutes to ultrasonically clean it in order to remove surface impurities, take it out and dry it, and use laser marking machine to process the surface microstructure to form a truss-shaped microstructure with a pitch of 200 μm, ready for use;

[0044] (2) Preparation of aluminum-magnesium alloy wire: 1. the mass fraction is 10% of pure magnesium ingot, 75% of aluminum powder, and 15% of iron-based alloy p...

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Abstract

The invention belongs to the technical field of electric arc fuse wire additive manufacturing and particularly relates to an aluminum-magnesium alloy structural component additive manufacturing method. The aluminum-magnesium alloy structural component additive manufacturing method is characterized in that a self-made argon protective device is placed on a workbench, an aluminum alloy base material is placed inside the argon protective device, and high-purity argon is fed in advance so that the oxygen content in a cavity can be 50-80 microlitre / L; an aluminum-magnesium alloy wire material is fed into a molten bath generated by electric arc through a special-made wire feeding device, so that an electric arc cladding layer combined with the pre-treated base material is formed; then cladding is conducted layer by layer through a numerical control processing program on each layer, and finally the high-performance fully-dense three-dimensional aluminum-magnesium alloy structural component which has the rapid solidification structure feature and is in a complicated shape is obtained finally. By the adoption of the aluminum-magnesium alloy structural component additive manufacturing method, the manufacturing cost is low, the manufacturing period is short, the material utilization rate is high, performance is stable, a complicated part can be rapidly manufactured, the structural strength of the aluminum-magnesium alloy structural component is greatly improved, and pores, cracks and other structure defects in alloy are reduced.

Description

technical field [0001] The invention belongs to the technical field of arc fuse additive manufacturing, and in particular relates to an additive manufacturing method for aluminum-magnesium alloy structural parts. Background technique [0002] Additive manufacturing technology (AM) is a technology based on discrete-accumulation thinking, through CAD design data, and adopts a layer-by-layer accumulation method to process and generate solid parts. It has the advantages of high forming efficiency, low cost, and compact parts. Scientific research institutions around the world have conducted a lot of research on it. According to the different cladding processes of additive manufacturing, it can be divided into laser welding (LAW) and plasma arc welding (PAW). , gas metal arc welding (GMAW), non-gas metal arc welding (GTAW), electron beam welding (EBW), etc. Compared with other additive manufacturing technologies, arc welding additive manufacturing technology has low cost, high eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/04B23K9/173B23K9/23B23K9/235
CPCB23K9/04B23K9/173B23K9/23B23K9/235
Inventor 梁鹏程
Owner 常州长东增材制造有限公司
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