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-dimensiona

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0044] Example one

[0045] The laser scanning method for manufacturing three-dimensional objects includes the following steps:

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

[0047] It is understandable that the galvanometer system works according to instructions. For example, its movement speed is also controlled by instructions. However, it should be noted that when the galvanometer system is turned on, it will not reach the instruction speed immediately, but needs to start from scratch. The command speed is reached by accelerating; in the same way, when the galvanometer system receives the closing command, it is impossible to stop immediately, but needs to stop by decelerating from a certain speed.

[0048] Step 12: When the galvanometer system is moving at a uniform 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 in a uniform motio...

Example Embodiment

[0057] Example two

[0058] This embodiment is a preferred solution of the present invention, and its distinguishing features from the first embodiment are as follows:

[0059] When the laser emitted by the laser completes the current line scan of the corresponding area, turn off the laser and control the galvanometer system to decelerate and jump;

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

[0061] It should be noted that in this embodiment, the jump and the deceleration of the galvanometer system start at the same time. During the whole jump, the galvanometer system can be in the following states. The first one 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 may also include other states, which will...

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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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