Scanning/molding method for improving additive manufacturing/molding quality of metal part

A molding method and additive manufacturing technology, applied in the field of scanning molding, can solve the problems of low molding efficiency, uneven powder laying, affecting the quality of powder laying, etc., so as to improve the density, reduce thermal stress, and reduce the probability of warping defects. Effect

Active Publication Date: 2016-08-31
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The current scan forming method for support is to scan the contour of each layer, which is less efficient in forming, and to

Method used

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  • Scanning/molding method for improving additive manufacturing/molding quality of metal part
  • Scanning/molding method for improving additive manufacturing/molding quality of metal part
  • Scanning/molding method for improving additive manufacturing/molding quality of metal part

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Experimental program
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Effect test

Embodiment

[0033] Such as figure 1 As shown, after the laser beam is focused by the metal additive manufacturing equipment, a processing point with concentrated energy (focused laser spot 1) will be obtained, and the metal powder will be melted through the processing point. However, there is a heat-affected zone at the processing point, which makes the forming melt channel wider than the processing point. The size of the forming melt channel 2 is a relatively important parameter, and the scanning parameters should be adjusted according to the size in the scanning forming.

[0034] Especially when scanning the contours of supports and parts, processing compensation is required, and the compensation value is usually set to half the size of the forming melt channel 2.

[0035] Such as figure 2 and image 3 As shown, if the laser spot compensation is not set during processing, when scanning the edge of the contour, the scanning track 5 at the center of the laser spot coincides with the t...

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PUM

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Abstract

The invention discloses a scanning/molding method for improving additive manufacturing/molding quality of a metal part. According to the scanning/molding method, a scanning method is divided into support scanning and entity scanning; during the support scanning, an interlayer scanning manner is adopted; the entity scanning comprises profile offset scanning of a shell and square block partition scanning of an interior part; after the profile shell scanning of an entity is completed, layer-by-layer offset partition scanning is carried out on the interior part; according to the size of the part, square blocks which are 5*5mm to 10*10mm are filled in the interior part; the scanning line directions between every two adjacent square blocks are 90-degree orthogonal to each other; during the entity scanning in the inner part of the part, the focusing spot diameter is improved through optical path adjustment so as to improve the processing efficiency. The partition square blocks in the interlayer sections are rotated 60 degrees layer by layer, so that the square blocks at the upper and lower layers are prevented from being overlapped so as to possibly eliminate the edge embossing defect, and the stress accumulation defect generated in the multi-layer stacking process can be prevented. The scanning/molding method can be widely applied to the field of additive manufacturing.

Description

technical field [0001] The invention relates to the field of additive manufacturing of metal parts, in particular to a scanning forming method for improving the forming quality of additive manufacturing of metal parts. Background technique [0002] Additive manufacturing, also commonly known as 3D printing, is a technology that uses CAD design data to accumulate material layer by layer to manufacture solid parts. Compared with traditional material removal (cutting) technology, it is a "bottom-up" material accumulation process. Manufacturing method. Compared with traditional manufacturing technologies, additive manufacturing has the advantages of being able to form parts with complex shapes, high forming precision, and saving materials. Metal additive manufacturing has become the most popular manufacturing technology because it can directly manufacture high-precision metal parts with dense structure and metallurgical bonding. [0003] At present, the forming materials of me...

Claims

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Application Information

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IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/38B22F10/36B22F10/366B22F10/364B22F10/47B22F10/28Y02P10/25
Inventor 王迪杨永强邓诗诗张自勉
Owner SOUTH CHINA UNIV OF TECH
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