A scanning forming method for improving the forming quality of metal parts additive manufacturing

A molding method and technology of metal parts, applied in the field of scanning molding, can solve the problems of low molding efficiency, affecting the quality of powder coating, and uneven powder coating, and achieve the effects of improving density, reducing the probability of warping defects, and reducing thermal stress

Active Publication Date: 2018-05-15
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • 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 too many support scans will affect the quality of powder coating during molding, and it is easy to cause uneven powder coating

Method used

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  • A scanning forming method for improving the forming quality of metal parts additive manufacturing
  • A scanning forming method for improving the forming quality of metal parts additive manufacturing
  • A scanning forming method for improving the forming quality of metal parts additive manufacturing

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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 the molding quality of metal parts additive manufacturing. The method divides the scanning method into two parts: support scanning and entity scanning. Contour offset scanning and internal square partition scanning are combined. After the solid contour shell is scanned, the interior is deflected layer by layer and partitioned, and the interior is filled with 5*5mm‑10*10mm squares according to the size of the part. The direction of the scanning line between two adjacent block partitions is 90° orthogonal, and the diameter of the focused spot is increased by adjusting the optical path to improve the processing efficiency when the object is scanned inside the part. Rotating the internal partition blocks of the interlayer cross-section by 60° layer by layer not only prevents the overlapping of the upper and lower blocks, eliminates edge protrusion defects as much as possible, but also prevents stress accumulation defects generated during the multi-layer accumulation process. This method can be widely used in 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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Patent Type & Authority Patents(China)
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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