Method for preparing functionally graded material based on selective laser melting technology, computer readable storage medium and electronic device

A functionally graded material and computer technology, applied in the direction of additive processing, etc., can solve the problems of powder feeding uniformity and density, destruction of powder uniformity and integrity, and inability to realize material gradient preparation, etc., to achieve organizational performance Accurate and controllable, reduced preparation cost, high degree of manufacturing freedom

Active Publication Date: 2022-03-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder in the powder bin is a single material during the entire additive manufacturing process, and the printing parameters used for printing are stable throughout the entire printing process, and the gradient preparation of materials cannot be achieved in both horizontal and vertical directions.
Patent WO2019184659A1 adjusts the alloy element composition of the powder during the printing process by gradient mixing powder to realize the printing of functionally graded materials by selective laser melting technology. This method complicates the printing process, and more importantly, the powder mixing destroys the powder Uniformity and integrity, with potential impact on print quality
Patent CN105386037B realizes the printing of functionally graded materials by selective laser melting technology by adding a second material powder feeding hopper above the powder bin. This method makes the equipment more complicated, and the powder hopper feeds powder by splashing. The uniformity and density of powder feeding need to be verified

Method used

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  • Method for preparing functionally graded material based on selective laser melting technology, computer readable storage medium and electronic device
  • Method for preparing functionally graded material based on selective laser melting technology, computer readable storage medium and electronic device
  • Method for preparing functionally graded material based on selective laser melting technology, computer readable storage medium and electronic device

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preparation example Construction

[0050] An embodiment of the present invention provides a method for preparing a functionally graded material, comprising the following steps:

[0051] S10, establishing a three-dimensional model of the target functionally graded material on a computer;

[0052] S20, setting a printing strategy and printing parameters to control different evaporation amounts of alloying elements in different regions;

[0053] S30, subdividing the three-dimensional model based on the printing strategy and printing parameters, obtaining outline printing data of each section, and inputting the printing data into a printer;

[0054] S40, based on the printing data, the alloy powder is printed into shape by adopting a printing method of layer-by-layer powder feeding and layer-by-layer laser scanning and melting.

[0055] Wherein, the printing strategy is to control any one of the number of laser scanning times, heat input or pressure in the alloy powder chamber between different alloy powder layers...

Embodiment approach 1

[0058] Embodiment 1: The printing strategy is to control the number of laser scans between different alloy powder layers, and perform b from the 1st+(n-1)a layer to the nath layer n Laser scanning times, where a is 100 to 1000, n is a continuous integer greater than or equal to 1, b n Take any integer from 0 to 30, and b n and b n-1 Take different values.

[0059] see figure 1 , n takes 1, 2, 3, 4, 5, 6..., after the 1st to a layer is powdered, perform b 1 Laser scans, b after powdering layers 1+a to 2a 2 Laser scan times, powdering in turn for laser scanning, from the 1st+(n-1)a layer to the nath layer for b n laser scans. b 1 , b 2 , b 3 …b n Take any integer from 0 to 30, and b 1 and b 2 different values, b 2 and b 3 The value of different...b n and b n-1 The values ​​are different.

[0060] This embodiment can prepare functionally graded materials with arbitrary arrangement of high and low alloy element contents in the vertical direction.

Embodiment approach 2

[0061] Embodiment 2: The printing strategy is to control the number of laser scans between different alloy powder layers, and perform b from the 1st+(n-1)a layer to the nath layer n Laser scanning times, where a is 100 to 1000, n is a continuous integer greater than or equal to 1, b n Take any integer from 0 to 30, and b n >b n-1 .

[0062] This embodiment can prepare a functionally graded material in which the content of alloy elements in the vertical direction decreases gradually from bottom to top. Said bottom-up means from layer 1 to layer na, please refer to figure 2 .

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Abstract

The invention relates to a method for preparing functionally graded materials, comprising the following steps: establishing a three-dimensional model of a target functionally graded material on a computer; setting a printing strategy and printing parameters to control different evaporation amounts of alloy elements in different regions; based on the printing strategy and The printing parameters are used to subdivide the three-dimensional model to obtain the outline printing data of each section, and input the printing data to the printer; based on the printing data, the alloy powder is printed by layer-by-layer powder feeding and layer-by-layer laser scanning and melting Printing and forming; wherein, the printing strategy is to control any difference in the number of laser scans, heat input or pressure in the alloy powder chamber between different alloy powder layers or different regions of the same layer of alloy powder layer. The invention further relates to computer readable storage media and electronic devices.

Description

technical field [0001] The invention relates to the technical field, in particular to a functionally graded material prepared based on selective laser melting technology and a preparation method thereof, a computer-readable storage medium and electronic equipment. Background technique [0002] The concept of functionally graded materials (FuncTionally Graded Materials) was first proposed in the 1880s by Japanese scholars Shinno Masayuki and others. Functionally graded materials refer to materials whose material properties such as elastic modulus, thermal expansion coefficient, and thermal conductivity change continuously from one end to the other. Such gradient functional changes are caused by gradient changes in the material's elemental composition, microstructural structure, and atomic arrangement. Due to the continuously changing coefficient of thermal expansion, functionally graded materials were mainly used for thermal stress relief in the early days. With the advance...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B22F3/105B33Y10/00B33Y30/00
CPCB33Y10/00B33Y30/00
Inventor温鹏刘金戈秦瑜
OwnerTSINGHUA UNIV