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Device and method for 3D-printing part model reverse-calculating through layer-by-layer detecting and defect positioning

A technology for 3D printing, parts, applied in measurement devices, optical testing for flaws/defects, additive manufacturing, etc., to avoid destructive testing

Active Publication Date: 2017-09-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Find the cause and propose solutions by analyzing the printing defects of the parts

Method used

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  • Device and method for 3D-printing part model reverse-calculating through layer-by-layer detecting and defect positioning
  • Device and method for 3D-printing part model reverse-calculating through layer-by-layer detecting and defect positioning
  • Device and method for 3D-printing part model reverse-calculating through layer-by-layer detecting and defect positioning

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Embodiment

[0032] as the picture shows. The invention discloses a 3D printing layer-by-layer detection and reverse parts model and a device for locating defects, including a laser head 3, a scanning galvanometer 9, a computer 1, a half-transparent mirror 16, a high-speed camera 20, and a controller 2; The high-speed camera 20 is telecommunications connected with the computer 1 through the controller 2;

[0033] The laser light path 17 of the laser head 3 is reflected into the scanning vibrating mirror 9 through the semi-transparent mirror 16, and the laser beam is controlled by the scanning vibrating mirror 9 to selectively melt the metal powder laid on the work platform 15; The mirror 9 collects the molten pool radiation, and transmits it to the high-speed camera 20 through the half-transparent mirror 16, and the high-speed camera 20 processes the molten pool radiation data, and converts the image information into the controller 2, and the controller 2 uses It is used to process the im...

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Abstract

The invention discloses a device and method for 3D-printing part model reverse-calculating through layer-by-layer detecting and defect positioning. The device comprises a scanning galvanometer, a half transparent and half reflecting mirror, an optical filter, a laser head, a high-speed camera, a controller and the like. The scanning galvanometer is used for controlling a laser beam to melt metal powder selectively, and molten pool radiation is reflected into the high-speed camera by the half transparent and half reflecting mirror and transformed into pictorial information to be transmitted to the controller. According to the device and method for 3D-printing part model reverse-calculating through layer-by-layer detecting and defect positioning, the device conducts monitoring on powder melting in the SLM machining process in an aiming mode, and feeds back to a computer software interface, molten pool characteristics of different positions are reflected in real time, the outline of each molten layer is measured accurately, and a part model is obtained through a reverse-calculating mode; and comparing and analyzing are conducted on the model and an original three-dimensional model, errors between a metal 3D printed part and original model data at the aspects of precision and dimension is obtained; the positions and the three-dimensional shapes of internal defects in the 3D printing process can be acquired precisely, and a destructive test aiming at the part in the later period of part printing is avoided.

Description

technical field [0001] The invention relates to metal 3D printing process monitoring and precise quality control, in particular to a 3D printing layer-by-layer detection reverse part model and a device and method for locating defects. Background technique [0002] Selective Laser Melting (SLM) technology is a rapid prototyping 3D printing technology that can directly form high-density, high-precision metal parts, but more than 50 different factors are at play in the melting process, such as size and Shape errors, voids in the fused layer, high residual stress in the final part, and the interrelationship of various variables such as material properties make the printing process difficult to quantitatively control. [0003] The development of quality monitoring has led to a significant improvement in the surface roughness and performance of the molded parts in additive manufacturing technology, reducing the deformation of the internal structure. A series of key parameters nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105G01N21/88B33Y30/00B33Y50/02
CPCG01N21/8851B22F3/003B33Y30/00B33Y50/02G01N2021/8887B22F10/00B22F10/38B22F12/49B22F12/90B22F10/31B22F10/28B22F12/44Y02P10/25
Inventor 王迪王艺锰杨永强
Owner SOUTH CHINA UNIV OF TECH
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