A bidirectional powder spreading device and powder spreading method for selective laser melting SLM equipment

Abstract

The invention discloses a two-way powder spreading device of SLM equipment and a powder spreading method. The powder spreading device comprises a powder spreading device body, two parallel auxiliary linear motor guide rails and two parallel linear motor movable sliding blocks, wherein the linear motor movable sliding blocks are arranged on the auxiliary linear motor guide rails; the powder spreading device body is arranged on the linear motor movable sliding blocks in an erecting mode and comprises a powder carrying device and two powder supply gears arranged inside the powder carrying device; the circle center position of each powder supply gear is provided with a servo motor transmission shaft; the two powder supply gears are arranged at the equal altitude; the gear top circles of the two powder supply gears are tangent in the radial direction; flexible powder scraping brushes are arranged on the two sides of the powder carrying device. By means of the powder spreading device, the redundant steps in the powder spreading process are reduced, powder is spread in the back and forth direction, the evenness and flatness of the spread powder are ensured through the flexible powder scraping brushes on the two sides, and the good repairing function is achieved on the process instability.

Description

technical field [0001] The invention relates to the technical field of laser selective melting SLM equipment, in particular to a two-way powder spreading device and powder spreading method for laser selective melting SLM equipment. Background technique [0002] Laser selective melting SLM integrates laser, precision transmission, new materials, CAD / CAM and other technologies. Through the fine laser focus spot of 30-80 microns, the selected area on the new powder layer is overlapped and scanned line by line, and the surface contour is formed. Layer-to-layer stacking and forming, so as to directly obtain metal functional parts with almost any shape and complete metallurgical bonding, and the density can reach nearly 100%. SLM simplifies complex three-dimensional geometry into two-dimensional plane manufacturing, and the manufacturing cost does not depend on the complexity of the part, but on the volume and molding direction of the part. [0003] As an important way to directl...

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Problems solved by technology

[0008] However, most of the existing laser selective melting SLM equipment is a double-cylinder, and the powder coating needs to span the two cylinders, and it only works in a single stroke, and then returns to the initial position. This method consumes a long time. The amount is small, the powder is uneven before and after spreading, the powder supply is large, and the demand for preset molding materials increases, and the scraping brush is made of silica gel, which is easy to wear and tear, which will affect the subsequent powder spreading. Therefore, this patent adopts quantitative powder feeding and two-way powder spreading The advanced flexible powder scraping system saves powder supply, shortens the powder spreading time by half, and the powder spreading process has a good repair effect on process instability

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