A vertical force floating powder coating scraper device for metal additive manufacturing

Abstract

The invention discloses a vertical force floating powder spreading scraper device for metal additive manufacturing, which solves the technical problems in the prior art that the scraper avoids surface defects in selected areas of laser sintering and spheroidizes bumps, and the main points of the technical scheme It includes a scraper bracket with an external drive source and a scraper connected between the scraper bracket and the powder bed. A floating knife holder is arranged on the scraper bracket near the scraper. The scraper is rotatably connected to the floating knife holder. When the sintering defect bump is reached, the floating knife holder drives the central axis of the upper end surface of the scraper to swing around the sintering defect bump, so that the scraper rotates to avoid the bump on the powder bed, and there is no direct collision between the scraper and the sintering defect bump. Cutting and other moving components that are destructive to the structure function eliminate the fatal defects of uneven powder spreading, loose powder bed, and backward transfer of defects in other forms of scraper powder spreading. The product yield rate is greatly improved, and the mechanism is simple and takes up space. Small technical effect.

Description

technical field [0001] The invention relates to a laser selective area melting molding device, more specifically, it relates to a powder spreading scraper device used in laser selective area sintering equipment. Background technique [0002] Metal additive manufacturing, also known as laser selective melting molding technology, is an emerging rapid manufacturing process. Its working principle is to use the existing CAD / CAM software to design the path of the laser beam and fill it with an inert protective gas. The metal powder is laid layer by layer in the airtight molding chamber, and the laser beam is controlled to scan the metal powder distributed in layers according to the designed path to obtain the single-layer shape of the molded part; then, the molding cylinder is controlled to drop a layer thick distance, and the powder spreading device is restarted. Spread the powder and repeat the above molding process, so that the metal parts with specific geometric shapes are fin...

AI Technical Summary

Problems solved by technology

[0006] In the technical solution of Comparative Document 1, the avoidance of bumps is to make the powder spreading scraper pass through the bumps smoothly by moving the scraper up and down. However, when the scraper falls through the bumps, the scraper will produce a downward take-off process. , this process directly impacts the powder bed when it touches the metal powder behind the bump, which will cause a vibration pattern on the surface of the powder bed. After laser sintering, this vibration pattern will reduce the surface quality of the molded product, that is, increase the surface quality. defect

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