High-efficiency large-scale selective laser melting forming device

Abstract

The invention discloses a high-efficiency large-scale selective laser melting forming device. Since the vibrating mirror scanning device can reciprocate in the powder spreading direction to realize the multi-station working state, it can realize the forming of large-sized parts and overcome the single vibrating mirror system. The forming size is small, and the vibrating mirror scanning device is installed outside the forming chamber as a whole, which can reduce the inert gas protection space, save the use of inert gas, and make the forming chamber compact in structure. At the same time, the blowing and smoking mechanism installed in the forming chamber It can be moved to the same station synchronously with the galvanometer scanning device, and the smooth realization of smoke and dust removal can be achieved during laser sintering at different stations, and the blowing and smoking frame of the blowing and smoking mechanism can move up and down relative to the support plate, which can realize the scraper working. The avoidance of the scraper does not interfere with the work of the scraper, which greatly improves the overall structural compactness of the forming chamber.

Description

technical field [0001] The invention relates to the field of selective laser melting, in particular to a high-efficiency large-scale selective laser melting forming device. Background technique [0002] Selective laser melting, also known as SLM, is a technology that uses metal powder to be completely melted under the heat of a laser beam, then cooled and solidified to form a shape. Under the action of high laser energy density, the metal powder is completely melted, and after heat dissipation and cooling, it is metallurgically welded with solid metal. It is through this process that selective laser melting forms a three-dimensional entity layer by layer. According to the layered slicing information of the 3D CAD model of the molded part, the scanning system controls the laser beam to act on the powder in the area to be formed. After one layer of scanning is completed, the working platform will drop a distance after one layer and then the powder feeding system will deliver a...

AI Technical Summary

Problems solved by technology

[0003] Due to the limitations of the scanning range of the optical galvanometer scanning system and the effective blowing and smoking range, the forming size of selective laser melting equipment in the world is limited to a small size range. For example, the maximum forming size of the EOS selective laser melting equipment M400 of the German 3D printing company Size 400mm×400mm, SLM solutions company SLM500 maximum forming size 500mm×280mm, Concept Laser company X LINE 2000R maximum forming size 800mm×400mm, large selective laser melting equipment is yet to be developed

[0004] In order to develop large-scale selective laser melting equipment, there is a multi-galvanometer structure in the prior art. Although this can be adapted to the forming of large-sized workpieces, due to the increase in the size range, there is too much smoke in the forming chamber, and the The laser system is extremely sensitive to dust, and excessive dust can easily cause greater damage. This requires timely and effective cleaning of a large amount of smoke generated during laser processing, otherwise it will seriously affect the quality of formed parts , It will even cause the interruption of the processing process, and the selective laser melting process is carried out in an inert gas atmosphere, so the selective laser melting equipment needs a high-efficiency laser smoke filtration system to achieve both filtering smoke and inert gas recycling

[0005] Although in the prior art, there is also a laser melting device that can remove the smoke and dust in the forming chamber, but its structure is complicated, and because it is also installed in the forming chamber, and in order to better ensure the dust collection effect, it is necessary to install the dust collection device Set it as close to the table of the forming table as possible, so that it is easy to hinder the reciprocating movement of the scraper during the powder spreading process during use; moreover, the laser melting equipment in the prior art that can eliminate the smoke and dust in the forming chamber is also not suitable for large-scale Formed parts, cannot form a good fit with the existing multi-galvanometer structure

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