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A method to eliminate edge stacking in laser additive manufacturing

A laser additive and edge technology, applied in the field of additive manufacturing, can solve the problems of inability to take into account the compactness of forming blocks, the generation mechanism of edge stacking is unclear, and the density of blocks cannot be taken into account, so as to reduce the phenomenon of edge stacking. , Eliminate or edge pile-up phenomenon, improve the effect of forming surface quality

Active Publication Date: 2019-06-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although changing the process parameters can improve the edge stacking height, it cannot take into account the compactness of the block, thereby further reducing the formability
At the same time, they also found that: the use of partitioned scanning has little effect on the edge stacking height; contour scanning makes the edge stacking height more significant; gradient laser power scanning can improve the edge stacking height but also cannot take into account the compactness of the formed block
[0007] At present, the mechanism of edge stacking in the SLM forming process is not clear, and how to eliminate or reduce the edge stacking while densely forming has not yet been proposed.

Method used

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  • A method to eliminate edge stacking in laser additive manufacturing
  • A method to eliminate edge stacking in laser additive manufacturing
  • A method to eliminate edge stacking in laser additive manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment adopts the edge remelting control method, which specifically includes the following steps:

[0041] (1) Processing model. Using Magics software, the original model is divided into two parts, the remelted frame and the core. The remelted border has a certain thickness, and its outer border coincides with the outer border of the original model. Move the graphics so that the center and the lower surface of the two parts of the graphics coincide, and finally export the STL file.

[0042] (2) Graphics import. Import the processed graphics into the processing equipment control software. The import sequence is the kernel, the remelted frame, and the processing sequence is the same.

[0043] (3) Process parameter setting. In each forming layer, the optimized process parameters are used to process the inner core to ensure the compactness and performance of the forming, and the remelted frame is processed with low energy density to remelt the edge position of...

Embodiment 2

[0047] This embodiment adopts the edge remelting control method, which is different from Embodiment 1 only in the setting of process parameters, and its process parameters are set as:

[0048] Kernel process parameter setting: Kernel process parameter setting: laser power P=350W, scanning speed v=1000mm / s, scanning distance l=0.1mm, scanning method is linear grating. Wherein, the phase angle can be selected as A=105°, and the powder layer thickness can be selected as D=0.04mm.

[0049] Remelting frame process parameter setting: laser power P=140W, scanning speed v≥2000mm / s, frame thickness 0.2mm, scanning distance l=0.1mm, phase angle can be selected as A=105°, and scanning method is linear grating;

[0050] If the traditional method is used for forming, the edge position of the forming block is 80 μm higher than the inner surface. In this embodiment, the height difference between the edge position of the final forming block and the inner surface is almost 10 μm, which elimina...

Embodiment 3

[0052] This embodiment adopts the edge remelting control method, which is different from Embodiment 2 only in the setting of process parameters, and its process parameters are set as:

[0053] Kernel process parameter setting: Kernel process parameter setting: laser power P=400W, scanning speed v=1500mm / s, scanning distance l=0.12mm, and scanning method is linear grating. Wherein, the phase angle can be selected as A=67°, and the powder layer thickness can be selected as D=0.04mm.

[0054] Remelting frame process parameter setting: laser power P=240W, scanning speed v≥3000mm / s, frame thickness 0.3mm, scanning distance l=0.12mm, phase angle can be selected as A=67°, and scanning method is linear grating;

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Abstract

The invention discloses a method for eliminating edge stacking in laser additive manufacturing, which belongs to the field of additive manufacturing, and adopts an edge remelting control method to control the phenomenon of edge stacking in additive manufacturing technology. By dividing the original model, it is divided into a remelted frame layer and a core layer, and setting appropriate process parameters to form different parts, so as to obtain almost fully dense processed parts without stacking height. It can eliminate or reduce the phenomenon of edge stacking, effectively improve the surface quality of forming, thereby further improving the dimensional accuracy, mechanical properties and forming efficiency of formed parts. The invention has the advantages of simple implementation, cost saving, easy engineering application, and can be widely used in manufacturing and processing parts by additive technology.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a method for eliminating or alleviating the phenomenon of edge stacking in the laser additive manufacturing forming process by an edge remelting method, which is used to improve the surface quality, dimensional accuracy, forming performance and forming efficiency of workpieces. Background technique [0002] Selective Laser Melting (SLM) is one of the main additive manufacturing technologies for manufacturing high-performance complex precision metal parts today. Based on the principle of discrete / superposition, the 3D CAD model is first sliced ​​and layered, and fine focusing is used to The laser beam with spot and high power density selectively melts the preset metal powder point by point, line by line, and layer by layer, and finally obtains high-precision, high-performance, and nearly fully dense three-dimensional metal parts. [0003] At present, SLM technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/364B22F10/36B22F10/28B22F10/366B22F10/80Y02P10/25
Inventor 刘家赫朱海红胡志恒张珞曾晓雁殷杰
Owner HUAZHONG UNIV OF SCI & TECH