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A method for cleaning residual powder on the surface and inside of a laser selective melting molding

A technology of laser selective melting and cleaning method, which is applied in the field of additive manufacturing, can solve problems affecting the surface quality of molded parts, and achieve the effect of improving surface quality

Active Publication Date: 2021-03-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the powder of the above two relationships cannot be cleaned, the uncleaned powder will completely bond with the surface of the molded part during the subsequent heat treatment, thereby affecting the surface quality of the molded part

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this embodiment, the method for cleaning the surface and internal residual powder of laser selective melting molded parts includes the following steps:

[0018] (1) Use an explosion-proof vacuum cleaner to clean the floating powder on the surface of the molded part;

[0019] (2) Vibration cleaning the molded parts after cleaning on a mechanical vibration table, the vibration frequency is 50Hz, and the vibration time is 25min;

[0020] (3) Use 0.5MPa low-pressure gas (inert protective gas, such as: argon, helium and nitrogen, etc.) to perform low-pressure flushing on the molded parts after mechanical vibration, so as to remove the floating powder formed after vibration;

[0021] (4) Use 1MPa high-pressure gas (inert protective gas, such as: argon, helium and nitrogen, etc.) to perform high-pressure flushing on the surface and internal structure (such as: inner runner, etc.) of the molded part in order to remove the adhesion on the molding Powder on the surface of the...

Embodiment 2

[0024] In this embodiment, the method for cleaning the surface and internal residual powder of laser selective melting molded parts includes the following steps:

[0025] (1) Use an explosion-proof vacuum cleaner to clean the floating powder on the surface of the molded part;

[0026] (2) Vibrate and clean the formed parts after cleaning on a mechanical vibrating table, with a vibration frequency of 100 Hz and a vibration time of 15 min;

[0027] (3) Use 0.55MPa low-pressure gas (inert protective gas, such as: argon, helium, etc.) to perform low-pressure flushing on the molded parts after mechanical vibration, so as to remove the floating powder formed after vibration;

[0028] (4) Use 1.5MPa high-pressure gas (inert protective gas, such as: argon, helium and nitrogen, etc.) to perform high-pressure flushing on the surface and internal structure (such as: inner runner, etc.) of the molded part in order to remove the adhesion on the Powder on the surface of molded parts;

[0...

Embodiment 3

[0031] In this embodiment, the method for cleaning the surface and internal residual powder of laser selective melting molded parts includes the following steps:

[0032] (1) Use an explosion-proof vacuum cleaner to clean the floating powder on the surface of the molded part;

[0033] (2) Vibrate and clean the formed parts after cleaning on a mechanical vibrating table, with a vibration frequency of 150 Hz and a vibration time of 20 min;

[0034] (3) Use 0.45MPa low-pressure gas (inert protective gas, such as: argon, helium and nitrogen, etc.) to perform low-pressure flushing on the molded parts after mechanical vibration, so as to remove the floating powder formed after vibration;

[0035] (4) Use 1.8MPa high-pressure gas (inert protective gas, such as: argon, helium and nitrogen, etc.) to perform high-pressure flushing on the surface and internal structure (such as: inner runner, etc.) of the molded part in order to remove the adhesion on the Powder on the surface of molded...

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PUM

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Abstract

The invention belongs to the field of additive manufacturing, and in particular relates to a method for cleaning residual powder on the surface and inside of a laser selective melting molded part. The method comprises the following steps: 1) using an explosion-proof vacuum cleaner to clean the floating powder on the surface of the molded part; 2) vibrating the cleaned molded part on a mechanical vibrating table with a vibration frequency of 5-200 Hz and a vibration time of 5-30 min; 3. ) Use inert gas less than 0.6MPa to perform low-pressure flushing on the molded parts after mechanical vibration; 4) Use inert gas from 0.6MPa to 2.5MPa to perform high-pressure flushing on the surface and internal structure of the molded parts; 5) Repeat the above process at least 5 times , until there is no obvious powder during mechanical vibration and high and low pressure gas flushing. The method of the invention can comprehensively, conveniently and quickly clean the metal powder in the surface and internal complex structure of the laser selective melting molding.

Description

Technical field: [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a method for cleaning residual powder on the surface and inside of a laser selective melting molded part. Background technique: [0002] The laser selective melting technology adopts the basic principle of rapid prototyping. The three-dimensional solid model of the molded part is sliced ​​and layered through special software to obtain the contour data of each section, and then these data are imported into the molding equipment. The equipment will control the laser according to the contour data. The beam selectively melts each layer of metal powder material, which is gradually stacked into a three-dimensional metal shape. The working principle of laser selective melting technology is: before the laser beam starts to scan, the powder spreading unit spreads the metal powder on the substrate, and the laser beam will selectively melt the powder on the substrate accor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F10/28B22F10/73B22F3/24B33Y40/00
CPCB22F3/24B33Y40/00B22F10/00B22F10/28B22F10/68Y02P10/25
Inventor 蔡雨升吉海宾雷家峰杨锐张宏伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI