Selective laser melting device and preparation method for gradient material

A selective laser melting and powder technology, applied in the field of 3D printing, which can solve the problems such as the inability to achieve a smooth transition of composition and organization

Inactive Publication Date: 2019-10-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention can only lay a single type of powder at one time, and different powders are laid alternately between layers. The formed composition transition zone and the depth of the molten pool are on the same order of magnitude, and it is also impossible to achieve smooth composition and organization in the vertical direction. transition

Method used

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  • Selective laser melting device and preparation method for gradient material
  • Selective laser melting device and preparation method for gradient material
  • Selective laser melting device and preparation method for gradient material

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Embodiment 1

[0059] This embodiment is a selective laser melting device, including a raw material bin 1, a powder mixing chamber 2, a powder storage bin 3, a powder dropper 13, a forming chamber 12, a powder recovery bin 7, a servo motor 8, a piston 9 and a computer 4, wherein , the number of raw material bins 1 is 2 to 5 according to actual printing requirements, and they are named in sequence from the first raw material bin to the Pth raw material bin, where P is the number of raw material bins, and P≤5. The number of the raw material bins is the same as the number of powder types required for actually printing the target sample.

[0060] The outlets of each of the raw material bins communicate with the inlet of the powder mixing chamber 2 through powder delivery pipes, and a flow monitor 15 and a control valve 14 are installed between the outlets of each raw material bin and the inlet of the powder mixing chamber 2 . The outlet of the powder mixing chamber communicates with the powder s...

Embodiment 2

[0069] This embodiment is a method for preparing composite gradient parts using the selective laser melting device. Said part is made of TC4-TA15.

[0070] The concrete process of this embodiment is:

[0071] Step 1, material pretreatment.

[0072] The material pretreatment is the drying of powder.

[0073] TC4 powder and TA15 powder were selected as raw materials, and the two powders were dried under vacuum conditions at 120°C to reduce the moisture in the powder and improve the fluidity of the powder.

[0074] The particle diameters of the TC4 powder and the TA15 powder are both 15-53 μm. Each of the powders is respectively placed in two raw material bins of the selective laser melting device.

[0075] In this embodiment, the forming width of the powder bed 5 is a×d=300mm×250mm, where a and d are the side lengths of the powder bed.

[0076] Step 2, establish the 3D model of the formed part.

[0077] The formed part 10 is a cuboid. A three-dimensional model of the part i...

Embodiment 3

[0120] This embodiment is a method for preparing composite gradient parts using the selective laser melting device. Said part adopts TC4-TA15-Ti 2 Made of AlNb.

[0121] The concrete process of this embodiment is:

[0122] Step 1, material pretreatment.

[0123] The material pretreatment is the drying of powder.

[0124] Choose TC4 powder, TA15 powder and Ti 2 AlNb powder was used as the raw material, and the three powders were dried under vacuum at 120°C to reduce the moisture in the powder and improve the fluidity of the powder.

[0125] The TC4 powder, TA15 powder and Ti 2 The particle size of the AlNb powder is 15-53 μm. Each of the powder materials is respectively placed in three raw material bins of the selective laser melting device.

[0126] In this embodiment, the forming width of the powder bed 5 is a×d=250mm×250mm, and a and d are both side lengths of the powder bed.

[0127] Step 2, establish the 3D model of the formed part.

[0128] The formed part 10 is a ...

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Abstract

The invention discloses a selective laser melting device and a preparation method for a gradient material. The device is provided with 2-5 raw material bins, and each raw material bin, a powder mixingroom, a powder storage bin, a powder dropper and a control valve define a powder feeding system with 2-5 channels, and an outlet of the powder storage bin communicates with an inlet of the powder dropper. Alloy powder needed for each slice layer is mixed in proportion, and is printed and formed through processes of raw material bin powder-feeding, mixing room powder-mixing, powder storage bin powder storage and powder dropper powder-dropping, so that preparation for the gradient material with components continuously changing in a vertical direction is realized; and the obtained formed part issmoothly transited in component and texture in macro-scale, so that component and performance mutation caused by metallurgical bonding, formed by layer-by-layer alternated printing of various powderin the prior art, of molten pool scale are eliminated, and therefore, integrated integral manufacturing of structure and function is realized. Uniform transition performance indexes in space scale canavoid the problems of discordant deformation and stress concentration, so that using performance of the formed part is favorably improved.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a device and method for preparing gradient materials by selective laser melting. Background technique [0002] Gradient material is a material whose chemical composition, organizational structure and performance characteristics present a specific gradient distribution inside the material through purposeful optimization and design of the internal composition and structure of the material during the material forming process, which can meet the needs of different parts of the part. Different performance requirements can meet the adaptation to multiple complex environments. At present, the preparation of gradient materials mainly uses technologies such as vapor deposition, plasma spraying, powder metallurgy, and self-propagating high-temperature synthesis. The forming size and shape complexity of gradient materials are limited, so it is necessary to find a method that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00B33Y30/00
CPCB33Y10/00B33Y30/00B22F10/00B22F10/36B22F10/32B22F10/366B22F12/17B22F12/44B22F10/28B22F12/67B22F10/73Y02P10/25
Inventor 王猛张丹李闯闯张云鹏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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