Powder spreading device and powder spreading method capable of automatically switching scrapers in SLM forming process

Abstract

The invention provides a powder spreading device and a powder spreading method capable of automatically switching scrapers in the SLM forming process. The powder spreading device comprises a powder spreading trolley, scraper frames, a flexible scraper, a hard scraper, motors and a control system. A software program selects the flexible scraper or the hard scraper according to the shape of a current slicing layer of a part for powder spreading, the control system receives an instruction of the software program, then the selected scraper is descended to a powder spreading surface through the corresponding motor, and meanwhile, the unselected scraper is lifted by a certain distance and is separated from the contact with the powder spreading surface; and when the scrapers need to be switched,the control system firstly lowers the selected scraper to the same height as the previous powder spreading scraper through the corresponding motor, and then the previous powder spreading scraper is lifted by a certain distance and is separated from the contact with the powder spreading surface. According to the powder spreading device and the powder spreading method, the problem that for a part which has a large breadth or a fine structure and has high size precision requirement, a scraper is prone to be clamped or the part is prone to be scratched when the scraper is used for powder spreadingon the part is solved.

Description

technical field [0001] The invention relates to the technical field of SLM forming equipment, in particular to a powder spreading device and a powder spreading method that can automatically replace scrapers during the SLM forming process. Background technique [0002] The scrapers used in the powder spreading device of the existing SLM forming equipment are mainly rubber scrapers, ceramic scrapers or cemented carbide scrapers. There are advantages and disadvantages to using scrapers of different materials. Rubber scrapers can form large-format structures and fine structures well, but it is easy to cause deviations in the final size of parts. Ceramic scrapers or hard alloy scrapers are easy to jam or even damage the scraper for large-format structures, and easy to scratch parts for fine structures, but they can be well formed for other shapes and ensure the dimensional accuracy of the parts. [0003] The powder spreading devices of the existing SLM forming equipment all use ...

AI Technical Summary

Problems solved by technology

[0003] The powder spreading device of the existing SLM forming equipment adopts a single material scraper

For parts with large format or fine structure and high dimensional accuracy requirements, it is often impossible to meet them at the same time. There is a lack of powder spreading devices for the above parts. In order to meet the above requirements, the industry needs to implement powder spreading devices that meet the relevant requirements and improve the forming efficiency. And meet the dimensional accuracy requirements

At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

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