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Scanning method used for metal laser selective melting forming process

A laser selective melting and forming process technology, applied in the field of additive forming manufacturing, can solve problems such as cracking and warping deformation, and achieve the effect of avoiding warping deformation, reducing residual stress, and reducing process difficulty

Active Publication Date: 2019-03-08
NAT INST CORP OF ADDITIVE MFG XIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problems existing in the existing scanning methods, the present invention comprehensively considers the causes of defects such as thermal stress concentration, warping deformation, and cracking during the forming process of metal parts, and proposes narrow edge areas of contours, Thiessen polygon partitions, and non-adjacent A scanning method for the metal laser selective melting forming process, which combines random selection scanning, vertical cross remelting of the same section, etc., ensures the forming quality of the final part

Method used

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  • Scanning method used for metal laser selective melting forming process
  • Scanning method used for metal laser selective melting forming process
  • Scanning method used for metal laser selective melting forming process

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Embodiment Construction

[0053] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0054] A scanning method for metal laser selective melting, the main steps include:

[0055] 1. Contour offset

[0056] Obtain the first-layer cross-sectional shape of the part entity, and offset the outer contour line of the part entity toward the center of the part entity by 0.5-2 mm to form an inner contour line, thereby dividing the first-layer cross-sectional shape into an inner contour area and A narrow-edge outer contour area; the part entity is composed of N sections; such as figure 1 As shown in , the specific offset distance can be determined according to the wall thickness of the part at the current position and the quality requirements of the side of the part;

[0057] 2. If figure 2 As shown, the partition graph is divided, and the Thiessen polygon is constructed;

[0058] 2.1) Construct a triangle network;

[0059] 2.1.1) Randomly s...

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Abstract

The invention relates to a scanning method used for a metal laser selective melting forming process. By means of the method, the probability that thermal stress concentration, stress concentration, cracking and other defects happen in the metal part forming process is greatly reduced, and the forming quality of final parts is ensured. The method comprises the main steps that (1) contour offset iscarried out; (2) multiple Thiessen polygons are constructed in an inner contour area; (3) the inner contour area is canned; (4) a narrow-side outer contour area is scanned; (5) the steps from 1 to 4 are repeated till scanning of all of N-1 layers of sections is completed; and (6) the Nth section is scanned.

Description

technical field [0001] The invention belongs to the technical field of additive forming manufacturing, and in particular relates to a scanning method for a metal laser selective melting forming process. Background technique [0002] Additive manufacturing technology (also known as "3D printing") is a high-end digital rapid manufacturing technology that has developed rapidly in recent years. It is suitable for the near-net shape of complex components. The formed parts manufactured by additive manufacturing technology have excellent mechanical properties. , suitable for rapid prototyping of various materials, and the material utilization rate is high. Selective Laser Melting (SLM) technology is a typical representative of additive manufacturing. It transforms the traditional three-dimensional manufacturing process into a planar manufacturing-cumulative superposition process, and realizes the manufacture of three-dimensional complex precision parts through layer-by-layer meltin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/364B22F10/28B22F10/366Y02P10/25
Inventor 张树哲陈祯魏培邹亚桐卢秉恒
Owner NAT INST CORP OF ADDITIVE MFG XIAN
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