A powder spreading device and a powder spreading method capable of automatically updating scrapers

Abstract

The invention provides a scraper-automatically-replaced powder spreading device and a powder spreading method. The device comprises a scraper holder, a first tensioning wheel, a second tensioning wheel, a flexible wire, a first winding device and a second winding device; the first tensioning wheel and the second tensioning wheel are arranged at the two ends of the scraper holder correspondingly and are oppositely arranged; one end of the flexible wire and the first tensioning wheel form a pulley structure, and the end of the flexible wire is wound around the first winding device; the other endof the flexible wire and the second tensioning wheel form a pulley structure, and the end of the flexible wire is wound around the second winding device; the each of the parts, connected with the first tensioning wheel and the second tensioning wheel correspondingly, of the flexible wire is used as a scraper, and the first winding device and the second winding device are arranged on the scraper holder. According to the device and the method, the tensioned flexible wire is adopted as the scrapers, one end of the flexible wire is wound around the first winding device, the other end of the flexible wire is wound around the second winding device, and when the scrapers need to be replaced, the two winding devices are used for winding the old flexible wire, and an another new flexible wire is unwound, so that the scrapers can be automatically replaced.

Description

technical field [0001] The invention relates to the technical field of powder bed 3D printing technology and equipment, in particular to a powder spreading device and a powder spreading method capable of automatically updating a scraper. Background technique [0002] In the 3D printing process using powder as material, such as SLS process and SLM process, it is necessary to accurately lay a layer of powder material before forming each layer. The quality of material laying directly affects the printing quality and stability. [0003] The existing scraper manufacturing and installation schemes must first solve the straightness of the scraper blade and the parallelism between the scraper and the printing plane, in order to meet the basic process requirements. With the increase of the number of printing layers, the accuracy of the scraper will inevitably decrease due to wear, or foreign matter sticking to the scraper will also affect the quality of powder coating. The general s...

AI Technical Summary

Problems solved by technology

With the increase of the number of printing layers, the accuracy of the scraper will inevitably decrease due to wear, or foreign matter sticking to the scraper will also affect the quality of powder coating

The general solution is to replace the scraper with a new one. This solution not only needs to suspend the printing process, but the process is cumbersome and inconvenient to operate, and it is difficult to ensure the accuracy of repeated installation and the continuity of the printing process.

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