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Method for adjusting printing process parameters in microstructure arrangement form

A technology of microstructure and process parameters, applied in the field of additive manufacturing, can solve the problems of high experience and shorten process adjustment process, and achieve the effect of reducing experience requirements, shortening process adjustment process, and reducing unnecessary experiments

Active Publication Date: 2020-12-11
航天科工(长沙)新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This scheme proposes a method to adjust the printing process parameters through the arrangement of the microstructure, which solves the problem of requiring too much experience for the experimenter, and gives clearer indicative features as the basis for adjusting the printing process parameters, shortening the process adjustment. process, reducing repetitive printing experiment tasks

Method used

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  • Method for adjusting printing process parameters in microstructure arrangement form
  • Method for adjusting printing process parameters in microstructure arrangement form
  • Method for adjusting printing process parameters in microstructure arrangement form

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0047] A method for adjusting printing process parameters through microstructure arrangement, comprising the following steps:

[0048] S1: Print the sample. After the sample is surface treated, observe the microstructure arrangement of the printed vertical side of the sample through a metallographic microscope;

[0049] S2: If the observation is in the form of a scale-like and neatly superimposed arrangement, print the stretching rod and perform a mechanical test; if the observation is in the form of a non-fish-scale arrangement, adjust the printing parameters and repeat step S1.

[0050] In step S1, there are 100 samples to be printed. The samples that affect the printing process during the printing process (such as the phenomenon of warping during the printing process) stop printing. The unscreened sample is subjected to surface treatment, the surface treatment is first metallographic polishing and then acid etching, the roughness of the metallographic polishing is equal to ...

Embodiment 2

[0055] Printing aluminum alloy powder, particle size 15um-53um, initial printing parameters: powder layer thickness 30um, laser power 380W, dot pitch 120um, exposure time 50us; the observation state after initial printing is scattered and sparsely arranged in the shape of multiple hills ;

[0056] It presents the arrangement form of several small peak melting pools scattered with a height of about 40um and a distance of about 30-50um from each other;

[0057] Adjust the printing parameters, the dot pitch is decreased by 10um each time from the original parameters, and the laser dot pitch of the initial printing parameters is adjusted to be smaller. After adjustment, the parameters are: powder layer thickness 30um, laser power 380W, dot pitch 90um, exposure time 50us;

[0058] After printing again, it is observed that the number of melting pools in the form of small peaks that appeared before has increased, and the small peaks overlap each other or the distance between small pe...

Embodiment 3

[0060] Printing aluminum alloy powder, particle size 15um-53um, initial printing parameters: powder layer thickness 30um, laser power 380W, dot pitch 80um, exposure time 100us; the observation state after the initial printing is in the form of many peaks with different heights,

[0061] You can see several ultra-large, ultra-long and bright molten pools with a length of 60um-120um and a width greater than 120um. Reduce the laser power or shorten the exposure time.

[0062] Adjust the printing parameters, and reduce the exposure time by 10% each time on the original parameters;

[0063] Adjusted parameters: powder layer thickness 30um, laser power 380W, dot pitch 80um, exposure time 70us;

[0064] After printing again, it is observed that the length and width of the ultra-large and ultra-long molten pool are reduced, and the color of the edge of the molten pool is darkened. Continue to adjust the printing parameters until the observation reaches the orderly superimposed arrange...

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Abstract

The invention relates to a method for adjusting printing process parameters in a microstructure arrangement form. The method comprises the following steps that S1, sample pieces are printed, and afterthe sample pieces are subjected to surface treatment, the microstructure arrangement form of the sample pieces with the vertical side faces printed is observed through a metallographic microscope; and S2, if the arrangement form of neat overlapping in scales is observed, stretching rods are printed, and a mechanical test is carried out; and if the non-scaled arrangement form is observed, the printing parameters are adjusted, and the step S1 is repeated. The method solves the problem that a traditional method for adjusting the printing process parameters depends on experience-based judgment ofpractitioners, and the experience requirement for the practitioners is lowered; therefore, the method for adjusting the printing process parameters has rules to follow, experience does not need to beused as the most important basis, the printing process parameters can be quantitatively adjusted according to the observed state, and the observed result can be qualitatively and quantitatively adjusted.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a method for adjusting printing process parameters through the arrangement of microstructures. Background technique [0002] Metal powder additive manufacturing technology (also known as "3D printing") is to slice the three-dimensional data model in the computer layer by layer to obtain the profile data of the cross-sections of each layer. Based on this information, the computer controls the laser to selectively melt layer by layer. Metal powder materials are piled up layer by layer to form three-dimensional metal parts. Metal powder additive manufacturing technology comprehensively uses advanced technologies in many engineering fields such as laser technology, computer technology, powder metallurgy technology, numerical control technology, and new materials. Metal powder direct molding has complex structural metal parts with metallurgical bonding structure, relat...

Claims

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Application Information

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IPC IPC(8): B22F3/105B33Y50/02
CPCB33Y50/02Y02P10/25
Inventor 颜铁林曹玄杨李晓庚宰雄飞陈钰青严雷明
Owner 航天科工(长沙)新材料研究院有限公司