Laser output device and 3D printer

Abstract

The invention relates to a laser output device, which includes a controller, lasers, optical elements, laser scanning vibrating mirrors and focusing lenses arranged in sequence. The laser is used to generate a laser beam, and the laser beam enters the laser scanning vibrating mirror through the optical element and is output to a region to be printed, and then converges to a scanning focus through the focusing lens. The laser output device also includes a translation device, a position sensing device and a stopper device electrically connected to the controller. The translation device is used to drive the optical element to move, and the position sensing device is used to detect the position of the driven optical element. The stopping device is arranged on the moving route of the optical element and can stop the optical element at different positions, thereby changing the position of the scanning focus. The invention also provides a 3D printer with the laser output device.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a laser output device and a 3D printer with the laser output device. Background technique [0002] 3D printer, also known as three-dimensional printer, is a kind of rapid prototyping technology, based on digital model files, using metal or non-metallic materials to form powder, melting / melting the laid flat powder to be formed layer by layer, and then Solidification build-up molding to construct three-dimensional solid printing equipment. With the rapid development of 3D printing technology, 3D printers have been widely used in product manufacturing. Among them, the laser output device is an important part of the 3D printer. [0003] At present, the laser output device usually uses a simple fixed-focus optical path, and there are two situations for the laser scanning sintering point: first, the laser scanning sintering and melting / melting of the powder to be formed by the l...

AI Technical Summary

Problems solved by technology

[0003] At present, the laser output device usually uses a simple fixed-focus optical path, and there are two situations for the laser scanning sintering point: first, the laser scanning sintering and melting / melting of the powder to be formed by the laser output device are carried out at a fixed focus, That is to say, the scanning sintering point is at the focus position. At this time, the laser spot is the smallest, and the line width of each scan is also the thinnest. Although the smallest spot scanning is suitable for scanning the inner and outer contours of the part, it can ensure the accuracy of the part contour. Will result in lower 3D molding efficiency

At this time, people will think of improving the efficiency of 3D molding by increasing the output laser power. However, when a relatively large laser power is output at the focal point, the powder to be molded will be partially vaporized and splash will occur, which in turn will affect the accuracy of 3D molding. and density

Second, the laser scanning sintering and melting / melting of the powder to be formed by the laser output device are not carried out at a fixed focus, that is, the scanning sintering point is not at the focal point. If the spot increases, the accuracy of the part outline cannot be guaranteed

Therefore, the 3D molding efficiency is low when the scanning sintering point is at the focus position, and the part contour accuracy cannot be guaranteed when the scanning sintering point is not at the focus position

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