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Laser scanning method for manufacturing three-dimensional objects

A technology of laser scanning and three-dimensional objects, which is applied in the direction of improving process efficiency, improving energy efficiency, and additive processing. Performance, uniform power density, avoiding the effect of edge overburning

Inactive Publication Date: 2015-08-19
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, when the laser scanning system is started, the galvanometer and the laser are turned on at the same time and cooperate to scan, so that although the sintering of the three-dimensional object can be completed, the edge of the sintered three-dimensional object has overburning phenomenon. , thus affecting the surface quality and internal performance of three-dimensional object parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A laser scanning method for manufacturing a three-dimensional object, comprising the steps of:

[0046] Step 11: When the scanning signal is received, turn on the vibrating mirror system;

[0047] It is understandable that the galvanometer system works according to instructions, for example, its movement speed is also controlled by instructions, but what needs to be explained here is that when the galvanometer system is turned on, it will not immediately reach the speed required by the instruction, but needs to start from zero. Accelerate to reach the speed required by the command; similarly, when the galvanometer system receives the shutdown command, it is impossible to stop immediately, but it needs to stop by decelerating from a certain speed.

[0048] Step 12: When the galvanometer system is moving at a constant speed, turn on the laser, so that the laser emitted by the laser scans the first line of the corresponding area under the control of the galvanometer system...

Embodiment 2

[0058] This embodiment is a preferred version of the present invention, and the distinguishing features from Embodiment 1 are as follows:

[0059] When the laser emitted by the laser completes the current line scan of the corresponding area, the laser is turned off, and the vibrating mirror system is controlled to decelerate and jump;

[0060] When the galvanometer system is accelerated after jumping, and when the galvanometer system is moving at a constant speed, the laser is turned on so that the laser emitted by the laser scans the next line of the corresponding area.

[0061] What needs to be explained here is that in this embodiment, jumping and the deceleration of the vibrating mirror system start at the same time. During the whole jumping process, the vibrating mirror system can be in the following states. The first is to decelerate to zero, and the other One is to decelerate to a certain speed greater than zero, and then accelerate. Of course, the galvanometer system c...

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PUM

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Abstract

The invention provides a laser scanning method for manufacturing three-dimensional objects. The laser scanning method comprises the following steps: when a scanning signal is received, a galvanometer system and a laser are controlled to be turned on and off, respectively, in the process when the laser emits laser for scanning, the galvanometer system is in a constant-speed motion state, and in this way, the laser power density received by powder needing to be sintered within a working plane is evener, and therefore, the disadvantage of edge overburning of a three-dimensional object product can be avoided; as a result, according to the laser scanning method for manufacturing the three-dimensional objects, the surface quality and internal properties of the three-dimensional object products can be improved.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping, and in particular relates to a laser scanning method for manufacturing three-dimensional objects. Background technique [0002] Rapid Prototyping (RP) is an advanced manufacturing technology with distinctive features such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, fast speed, and rich and diverse material types. Since the late 1980s, So far, it has become a pillar technology in modern advanced manufacturing technology. The specific process mainly includes layered slicing, powder feeding, and laser scanning steps. The laser scanning step is a key factor affecting the precision and molding speed of three-dimensional objects. In the prior art, when the laser scanning system is started, the galvanometer and the laser are turned on at the same time and cooperate to scan, so that although the sintering of the three-dimensional object can be completed...

Claims

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Application Information

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IPC IPC(8): B22F3/105B29C67/00B33Y10/00
CPCY02P10/25
Inventor 陈虎清曾思齐许小曙
Owner HUNAN FARSOON HIGH TECH CO LTD
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