3D (three dimensional) printing process with laser beam scanning in archimedes spiral way

Abstract

A 3D (three dimensional) printing process with laser beam scanning in archimedes spiral way comprises a laser and optical system, a turntable and guide rail guide frame system, a spindle motor and guide frame shift servo motor system, and a computer control system. A laser is mounted on a turntable laser disc or a turntable guide frame, or is mounted independently from a turntable, a laser beam is focused onto a printer working plane by a stationary reflector of turntable optical system and a reflector and a lens on the guide frame, or, a laser beam of a laser on the guide frame is focused onto the printer working plane by the lens; when the turntable is driven by a spindle motor to rotate in local constant angular velocity or constant angular velocity, and the guide frame is driven by a servo motor to move horizontally in constant velocity, omission-free and no-repeat archimedes spiral scanning of the laser beam on SLA, SLS, SLM and LOM printing working planes can be completed, and after layer-by-layer processing, a workpiece body is obtained. The printing process can realize no-distortion and high quality scanning of ultra large working planes and processing of ultra large workpieces, has the advantages of simple structure, low cost and excellent quality, is especially suitable for printing aerospace, aviation, electric power, marine, construction and other large complex workpieces.

Description

Technical field: [0001] The present invention relates to 3D printing technology. Background technique: [0002] At present, several mainstream 3D printing processes that use laser beam printing, such as SLA, SLS, SLM, LOM, etc., whether they use the scanning method before the objective lens or the scanning method after the objective lens, can obtain high High-precision scanning effect, the scanning point on the working surface has a small and consistent size, or the defocus error is small within the depth of focus; however, when scanning a large working surface, if the front scanning method of the objective lens is used , because the flat field lens (F-Theta lens) with a larger working area is expensive to manufacture, and the focal length is longer, the application is difficult, the focal plane glazing class becomes larger, and the scanning pattern distortion on the working surface becomes larger, which affects the scanning effect ; If the objective lens rear scanning meth...

AI Technical Summary

Problems solved by technology

[0002] At present, several mainstream 3D printing processes that use laser beam printing, such as SLA, SLS, SLM, LOM, etc., whether they use the scanning method before the objective lens or the scanning method after the objective lens, can obtain high High-precision scanning effect, the scanning point on the working surface has a small and consistent size, or the defocus error is small within the depth of focus; however, when scanning a large working surface, if the front scanning method of the objective lens is used , because the flat field lens (F-Theta lens) with a larger working area is expensive to manufacture, and the focal length is longer, the application is difficult, the focal plane glazing class becomes larger, and the scanning pattern distortion on the working surface becomes larger, which affects the scanning effect ; If the objective lens rear scanning method is adopted, the optical class will be seriously distorted due to the large defocus error on the working surface edge; length, reduce the deflection angle, and reduce the optical class distortion, but in this way, the geometric size of the entire optical system will increase, which will also cause difficulties in application

Therefore, based on the above reasons, the current SLA, SLS, SLM and LOM that use laser beams and X-axis Y-axis galvanometer deflection scanning to print large-sized workpieces on a large working surface are severely limited.

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