Design and manufacturing method used for selective laser sintering sand mould regional strength change

A technology of laser selective sintering and manufacturing method, which is applied in design optimization/simulation, calculation, special data processing applications, etc., can solve the problems of difficult realization and complicated scanning trajectory division, and achieves improved sintering efficiency, improved sand mold design, and improved adaptability sexual effect

Active Publication Date: 2017-05-17
XI AN JIAOTONG UNIV
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Problems solved by technology

On the other hand, the sand mold strength requirement is continuously changing, but the continuously changing sintering process parameters make the scanning trajectory division more complicated and difficult to realize, and it does not mean good performance and efficiency

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  • Design and manufacturing method used for selective laser sintering sand mould regional strength change
  • Design and manufacturing method used for selective laser sintering sand mould regional strength change
  • Design and manufacturing method used for selective laser sintering sand mould regional strength change

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Embodiment Construction

[0021] The content of the present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the practical application of the invention is not limited to the following embodiments.

[0022] refer to figure 1 , a method for designing and manufacturing laser selective sintering sand molds with variable strength in different regions, comprising the following steps:

[0023] 1) Design a three-dimensional model of the gating system with a gating riser according to the shape characteristics of the casting parts;

[0024] 2) Divide the three-dimensional model of the gating system into finite element models for numerical simulation;

[0025] 2.1) Generate a consistent grid at the interface between the casting and the sand mold, and additionally generate the surface unit of the interface. The main body of the grid is a tetrahedral grid, and the interface is set as an expansion layer. The unit type is selected as a triangular prism unit...

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Abstract

The invention provides a design and manufacturing method used for selective laser sintering sand mould regional strength change. Firstly, a belt casting system three-dimensional model is designed according to appearance characteristics of a cast part and divided into finite element meshes used for numerical simulation, fluid-solid coupling and thermal stress calculation are conducted on the finite element meshes, stress distribution of a sand mould in the filling and solidifying processes is obtained, the stress distribution is converted into equivalent stress according to a sand mould material strength standard, and strength required distribution of the sand mould is obtained; secondly, sintering efficiency is taken into consideration, process parameters meeting requirements are extracted from a process parameter library, and regions using different process parameters are divided out; thirdly, the sand mould model obtained after partition is sliced to generate a regional variable-process-parameter scanning strategy; fourthly, the regional variable-process-parameter scanning strategy is imported into a selective laser sintering device for layered sintering and manufacturing, and finally the sand mould with regional strength is obtained. The method is capable of improving efficiency of manufacturing the sand mould through the laser sintering technology and improving adaptability of the sand mould to the casting process.

Description

technical field [0001] The invention relates to the technical field of selective laser sintering, in particular to a design and manufacture method for laser selective sintering sand molds with variable strength in different regions. Background technique [0002] Selective Laser Sintering (SLS for short) is an additive manufacturing technology that uses laser heating powder sintering. Laser selective sintering process experiments show that process parameters (laser power, scanning distance, etc.) have a direct impact on performance indicators such as strength, manufacturing efficiency, and dimensional accuracy of sintered parts. In fact, various performance indicators restrict each other and cannot all achieve the best performance. For this reason, how to choose the optimal process parameters is a hot spot in the field of laser sintering. [0003] At present, most laser selective sintering equipment adopts fixed process parameters. This process parameter is aimed at the mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 田小永钟琪曹毅李涤尘黄小康同治强
Owner XI AN JIAOTONG UNIV
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