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Laser scanning method for laser melting in selected area

A selective laser melting and laser scanning technology, which is applied in the direction of improving process efficiency and energy efficiency, can solve the problems of affecting scanning efficiency, discrete distribution, and small span of strip scanning partitions.

Active Publication Date: 2015-04-29
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common partitioning methods are strip and checkerboard. The strip scanning partition has a small span, but the residual stress in one direction is not sufficiently discretely distributed; the checkerboard scanning residual stress distribution is discrete, but the scanning direction needs to be changed frequently, and the span is large , affecting the scanning efficiency

Method used

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  • Laser scanning method for laser melting in selected area
  • Laser scanning method for laser melting in selected area
  • Laser scanning method for laser melting in selected area

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Embodiment Construction

[0031] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] A laser scanning method for selective laser melting, the main steps of which include:

[0033] 1. Partition graphic division

[0034] According to the cross-sectional information of the workpiece, the workpiece area is divided into several partition graphics, the partition graphics include several grid-shaped regular triangles with a side length of 1mm~10mm and several irregular graphics on the boundary, and the gap between adjacent partition graphics The value of G is -1mm~1mm,

[0035] When G>0, there is a certain distance between adjacent partitions, such as figure 1 shown;

[0036] When G=0, adjacent partitions share one edge, such as figure 2 shown;

[0037] When G image 3 shown.

[0038] 2. Partition graphics scan

[0039] The irregular figure of the boundary is regarded as a partitioned regular triangle for scanning processing, an...

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Abstract

The invention discloses a laser scanning method for laser melting in a selected area. The laser scanning method comprises the following steps: dividing a workpiece area into a plurality of latticed regular triangles with side length being 1mm-10mm and a plurality of irregular figures at borders according to the cross section information of a workpiece, taking a gap G between the adjacent figures from -1mm to 1mm; scanning the irregular figures at the borders as the zoning regular triangles and adopting an equidistant scanning line for successively finishing the zoning figure scanning; according to the zoning direction, adopting the equidistant scanning line for successively finishing the gap scanning; scanning along a practical outline of the workpiece or the outline deviating within 1mm inward or outward to the practical outline of the workpiece according to the requirement, or repeatedly scanning along a plurality of outlines deviating from the practical outline of the workpiece within 1mm, thereby finishing the cross section canning for the workpiece. According to the scanning method provided by the invention, the scattering effect of residual stress in the workpiece during a laser scanning process is improved, the laser scanning direction during the scanning process does not need to be repeatedly changed, the scanning efficiency is high, the technique control is simple, and the compactness and the precision of the workpiece are ensured.

Description

technical field [0001] The invention relates to a metal direct and rapid manufacturing technology, in particular to a laser scanning method of a selective laser melting technology. Background technique [0002] Selective laser melting technology is a rapid manufacturing technology that scans layer by layer by controlling laser, and superimposes layers to form three-dimensional workpieces. The process flow is as follows: 1. First, slice the 3D model of the workpiece to obtain the contour information of each layer of the workpiece; 2. Spread the powdery material evenly on the surface of the working platform, and the laser selectively melts it according to the system instructions Powder; 3. After a section is completed, a new layer of material is laid on it, and scanning is continued selectively according to the section information corresponding to the three-dimensional object. By repeating steps 2 and 3, a three-dimensional workpiece is finally obtained. The advantage of thi...

Claims

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Application Information

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IPC IPC(8): B22F3/105
CPCY02P10/25
Inventor 许小曙徐峰苏婷边宏
Owner HUNAN FARSOON HIGH TECH CO LTD
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