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Novel laser area array selective melting additive manufacturing process simulation method

An additive manufacturing and process simulation technology, applied in additive processing, 3D modeling, instruments, etc., can solve the problems of long scanning time and uneven stress distribution, and achieve the effect of improving processing efficiency, promoting development and reducing deformation.

Active Publication Date: 2020-08-25
INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: adopting the point-by-point scanning method, there is a long scanning time in the face of large cross-section melting, and the point scanning has problems such as uneven stress distribution caused by different sequences. The present invention provides a novel method for solving the above problems Laser area array selection fusion additive manufacturing process simulation method, this method is highly feasible, suitable for combining numerical simulation with actual processing, using simulation as an auxiliary means for prediction and parameter optimization, and helpful for the actual production of area array technology Realization of area exposure

Method used

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  • Novel laser area array selective melting additive manufacturing process simulation method
  • Novel laser area array selective melting additive manufacturing process simulation method
  • Novel laser area array selective melting additive manufacturing process simulation method

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Experimental program
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Embodiment 1

[0043] This embodiment provides a novel method for simulating a laser surface array selective fusion additive manufacturing process, and the specific steps are as follows:

[0044] Step 1. Design point source array

[0045] Under the condition of 200mm×200mm×25mm substrate, simulate the area array exposure area of ​​80mm×80mm, the size of the exposure area can be adjusted and optional in the simulation step; put 80×80 dot matrix spots in this area, and the density of dot matrix spots can be adjusted , The number is adjustable; the distance between each spot is 0.1mm-1mm, and the radius of a single spot heat source is 50μm-500μm.

[0046] This step needs to set the material properties and its thermophysical parameters.

[0047] Step 2, stl format file slice batch boundary extraction and grayscale processing

[0048] Export the designed 3D model as an stl format file, write a program to call the model for slice processing and output pictures of each layer, write a program to c...

Embodiment 2

[0060] In this embodiment, taking the low-melting point metal Sn-9Zn alloy as an example, a simulated area-array exposure molten metal additive manufacturing experiment is carried out on a substrate with a length of 200 mm x a width of 200 mm x a height of 25 mm. This embodiment is used to illustrate the temperature field simulation process of custom spot shape, such as figure 1 with figure 2 shown.

[0061] First design the point source array. Create a substrate of 200mm×200mm×25mm, and create an area array exposure area of ​​80mm×80mm at the same time. The size of the exposure area can be adjusted and optional in the simulation step; an 80×80 array spot is placed in this area, and the density of the array point spot is adjustable and the number Adjustable; spot spacing 1mm, single spot heat source radius 500μm.

[0062] The substrate material is set as Sn-9Zn, and its thermophysical parameters are set to simulate the temperature field of processing Sn-9Zn alloy powder. ...

Embodiment 3

[0065] In this example, 6061 series aluminum alloy is taken as an example to simulate an area array exposure molten metal additive manufacturing experiment on a substrate with a length of 200 mm × width 200 mm × height 25 mm. This example is used to illustrate the role and effect of point source non-uniform regulation .

[0066] Design point source arrays. Create a substrate of 200mm×200mm×25mm, and create an area array exposure area of ​​80mm×80mm at the same time. The size of the exposure area can be adjusted and optional in the simulation step; an 80×80 array spot is placed in this area, and the density of the array point spot is adjustable and the number Adjustable; spot spacing 1mm, single spot heat source radius 500μm.

[0067] The substrate material is set to 6061 series aluminum alloy, and its thermophysical parameters are set to simulate the temperature field of processing 6061 aluminum alloy powder. In this embodiment, the simulated light spot pattern does not come...

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Abstract

The invention discloses a novel laser area array selective melting additive manufacturing process simulation method which comprises the following steps of S1, designing a point source array, wherein point sources are heat sources forming point-shaped light spots; S2, comparing the point source array with a to-be-exposed pattern, and lightening related point sources to form planar light spots; S3,setting boundary conditions of the planar light spots, and loading a heat source; and S4, adjusting the temperature distribution of the exposure area by adjusting the thermal power and / or exposure time of the corresponding point source. The method is high in feasibility, is suitable for combining numerical simulation with actual processing, takes the simulation as an auxiliary means for predictionand parameter adjustment parameter optimization, and facilitates the implementation of actual area array exposure of an area array process.

Description

technical field [0001] The invention relates to the fields of additive manufacturing and rapid prototyping, in particular to a novel laser surface array selection melting additive manufacturing process simulation method. Background technique [0002] Metal additive manufacturing is a new additive manufacturing method in the field of additive manufacturing, which is mainly based on the principle of fusion deposition. Electron beams or lasers are mostly used as energy sources for metal melting and deposition, and the relevant process methods are constantly being innovated and optimized, which have gradually attracted the attention of researchers in this field. The powder-spreading selective laser melting process in the traditional metal fusion deposition technology is a typical process method in the additive manufacturing process. This process has the advantages of high precision, short processing cycle, high forming density and good forming quality, which solves the difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06T17/00B33Y50/00G06F119/08
CPCG06F30/20G06T17/00B33Y50/00G06F2119/08Y02P10/25
Inventor 王晨光沈显峰王国伟王开甲吴鸿飞孙凯华陈金明
Owner INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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