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Numerical simulation method for selective laser melting process

A technology of laser selective melting and numerical simulation, which is applied in the field of laser printing, can solve the problems of reducing the scrap rate and achieve the effect of preventing warping and optimizing printing parameters

Inactive Publication Date: 2018-05-22
XIAN BRIGHT ADDTIVE TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

In view of the warpage and deformation problems existing in the actual printing process of parts, CAE simulates the entire printing process to predict the final deformation and residual stress distribution of parts, and provide effective guidance for supporting structure design and reducing scrap rate

Method used

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  • Numerical simulation method for selective laser melting process
  • Numerical simulation method for selective laser melting process
  • Numerical simulation method for selective laser melting process

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] Adopt following technology in the numerical simulation method of a kind of laser selective melting process of the present invention:

[0040] 1. Digitize and discretely process the 3D model of the printed part;

[0041] The 3D printing process is to complete the superposition of materials layer by layer, and finally stack them to form the entire print; the 3D model of the printed part is digitized and discrete, that is, the CAD model file is converted into a digital model with a slice layer; the size of the model is the same as the original The model error should be within the error required by the project; among them, the transformation of the whole slice layer thickness and the laser scanning contour route is the key to the simulation process.

[0042] 2. Establishment of finite element model for additive manufacturing process simul...

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Abstract

The invention discloses a numerical simulation method for a selective laser melting process. The method comprises a first step of establishment of a finite element model of additive manufacturing process simulation; a second step of meshing on the finite element model of the additive manufacturing process, wherein full-hexahedron meshing is adopted; a third step of definition of printing powder material properties and thermal physical performance parameters which must be determined for temperature field analysis in the additive manufacturing process; a fourth step of loading of a control equation of a mobile heat source; and a fifth step of analysis of thermal stress field and total deformation changes in the additive manufacturing process and after sintering is finished. Through the numerical simulation method for the selective laser melting process, printing parameters can be optimized, and warping and deformation of parts can be prevented; and the method provides effective guidancefor supporting structural design and a printing strategy (speed and direction), lowering the rejection rate and realizing ''success at a time''.

Description

technical field [0001] The invention belongs to the technical field of laser printing, and in particular relates to a numerical simulation method for a laser selective melting process. Background technique [0002] Laser selective melting technology (3D Printing Technology) is a technology based on digital model files to form object models by printing metal powder and other materials layer by layer. The forming principle is: first use CAD software to design the 3D solid model of the part on the computer, and then slice and layer the 3D model through the slicing software to obtain the contour data of each section, and fill the scanning path generated by the contour data. The equipment will follow the Fill the scanning line, control the laser beam to selectively melt each layer of metal powder materials, and gradually stack them into three-dimensional metal parts. [0003] Laser selective melting technology is a major achievement in the field of manufacturing in recent years....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06T17/20
CPCG06T17/20G06F30/23G06F2111/10G06F2119/06G06F2119/08
Inventor 赵晓明李晓敏王佳骏胡桥薛蕾
Owner XIAN BRIGHT ADDTIVE TECH CO LTD
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