A laser sintering printer

Abstract

The invention discloses a laser sintering printer, which belongs to the field of additive manufacturing and includes a frame, a cylinder body, a workbench, a lead screw and a nut pair, and a powder supply and spreading mechanism; the cylinder body includes an upper cylinder body and a lower cylinder body, The upper and lower cylinders are connected by a telescopic structure; the workbench is located inside the lower cylinder and is fixedly connected with the lower cylinder; the screw nut pair is located at the center of the outer bottom of the lower cylinder, and is aligned with the Z axis of the cylinder. Consistent; the outside of the lower cylinder is provided with a directional guide rail that supports the cylinder and cooperates with the screw nut pair to make the lower cylinder move up and down. The purpose of the present invention is to provide a retractable laser sintering printer which can solve the problems of sealing, cleaning, reducing the quality of the molding cylinder, and improving the quality and efficiency of powder spreading.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to a laser sintering printer. Background technique [0002] With the development of 3D printing technology, the research on laser sintering technology is getting more and more in-depth. The process of laser sintering processing parts is that the powder supply mechanism spreads a certain amount of powder on the workbench, and then the powder is leveled by the scraper, and then the laser head sinters the current layer of powder. After the processing is completed, the supplier The powder spreading mechanism spreads the powder, continues to scrape, and repeats this process to obtain the required parts. [0003] In laser sintering technology, the sealing condition of the molding chamber is very high. Most of the current technologies focus on how to use external conditions to realize the sealing state of the molding chamber, such as setting a vacuum pump outside the molding chamber ...

AI Technical Summary

Problems solved by technology

[0003] In laser sintering technology, the sealing condition of the molding chamber is very high. Most of the current technologies focus on how to use external conditions to realize the sealing state of the molding chamber, such as setting a vacuum pump outside the molding chamber and using vacuum to achieve sealing; or How to design a better sealing part or material to realize the sealing between the workbench and the forming cylinder wall, but the above-mentioned existing technologies cannot achieve a relatively ideal sealing effect, and some of the sealing effects are also damaged due to wear and tear. Getting worse, leading to a series of maintenance problems due to the need to replace seals frequently, and more importantly, resulting in substandard quality of molded parts

[0004] Due to the close contact between the workbench and the molding cylinder wall, this will cause the powder to enter the seal during the processing. If the powder needs to be replaced for the processing of various parts, the powder must be cleaned. However, the existence of the seal , making it difficult to remove the powder

[0005] In addition, the molding quality of parts is largely determined by the quality of powder coating. If the quality of powder coating is not high, the powder coating effect will not be good. If the powder contains pores and is uneven, the processed parts will have defects such as pores and poor structure.

The current powder spreading and scraping methods in some technologies are not satisfactory. For example, after powder spreading in many powder spreading devices, the powder is unevenly distributed on the workbench, making it difficult to scrape flat; some other devices are complex in design and affect efficiency

Images