Laser selective laser melting rapid preheating and powder spreading device

Abstract

The invention discloses a laser selective laser melting rapid preheating and powder spreading device. The laser selective laser melting rapid preheating and powder spreading device comprises a closedcavity, wherein a forming cavity and a recycling cavity are arranged in the closed cavity; an automatic powder adding mechanism is arranged on the upper portion of the forming cavity; and a scraper powder spreading mechanism with an adjusting assembly is arranged on the automatic powder adding mechanism in a matched manner. A metal powder preheating unit is directly integrated in a powder storagecabin, powder which is about to participate in printing only needs to be rapidly preheated to a set temperature, residual stress generated in a forming process of the metal powder is reduced, the shape accuracy and the dimensional accuracy of a forming piece are ensured, quantitative powder feeding can be realized by a scarper portion, bidirectional powder spreading is implemented, and online leveling of a scraper can be implemented.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a laser selective melting rapid preheating powder spreading device. Background technique [0002] Laser selective melting is a typical representative of additive manufacturing technology. Based on the basic idea of ​​additive manufacturing rapid prototyping, it transforms the traditional three-dimensional manufacturing process into a cumulative and superimposed planar manufacturing process. By slicing the three-dimensional model of the part to obtain the parts of each layer Contour data, the laser beam is used to melt the metal powder layer by layer according to the contour of each layer, and the solid parts are manufactured layer by layer, so the laser selective melting technology is suitable for the manufacture of metal parts of almost any complex shape. [0003] However, in the laser selective melting process, the metal powder will undergo a process of rapid mel...

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Problems solved by technology

The patent "Preheating Device and Preheating Method for Powder Delivery Cylinder of Selective Laser Melting SLM Equipment" (Patent No.: CN103100713B) proposes a method of using electromagnetic induction to heat the powder delivery cylinder to preheat metal powder. Although this method can preheat Hot metal powder, but the powder in the powder-carrying cylinder is heated unevenly, and the entire powder-carrying cylinder is heated, not only the heating efficiency is low but also the energy loss is large

The patent "a powder preheating device and preheating method for laser selective melting equipment" (application number: CN106623919A) proposes a method of using multiple heating units embedded in the side of the main body of the forming cylinder to heat the main body of the forming cylinder. This method can make the parts cool down slowly during the printing process and reduce the internal stress concentration. However, if the heating unit circulates the molding cylinder for a long time, it will affect its overall shape and internal structure, and there is no temperature monitoring function, so it cannot be real-time. Monitor its heating temperature

At the same time, the current laser selective melting forming system generally uses the powder spreading method to ensure the levelness and uniformity of the metal powder layer. Therefore, the scraper part related to the powder spreading effect directly affects the forming quality of the part, and the convenience of the scraper part is also a factor. affect work efficiency

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