Dynamically-adjustable flexible powder spreading device for selective laser melting system

Abstract

The invention discloses a dynamically-adjustable flexible powder spreading device for a selective laser melting system. The dynamically-adjustable flexible powder spreading device for the selective laser melting system comprises a movable support, a cylinder core support, a powder spreading cylinder and a drive device, wherein the powder spreading cylinder is connected below the movable support through the cylinder core support; an elastic gasket is arranged between the cylinder core support and the movable support; the powder spreading cylinder is clamped by clamping devices mounted at two sides of the movable support; the power input of the powder spreading cylinder is connected with the drive device fixedly arranged below the movable support; a wireless camera is mounted on the movable support; the signal output of the wireless camera is wirelessly connected with the data input of a computer; the signal output of the computer is wirelessly connected with the control of the drive device. The wireless camera performs image collection on a powder spreading surface, on the basis of computer evaluation, if the quality of powder spreading is unqualified, the drive device is remotely controlled to rotate the powder spreading cylinder, and the powder spreading working face is adjusted in real time, thereby realizing closed-loop control. The quality of powder spreading in the whole manufacturing process can be guaranteed, the impact can be reduced, powder bouncing and powder flying are avoided, and the service life of the powder spreading device is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of laser selective melting, in particular to a dynamically adjustable flexible powder spreading device of a laser selective melting forming system. Background technique [0002] Selective Laser Melting (SLM) is an advanced additive manufacturing technology that has emerged rapidly in recent years. Metal parts of any shape with a density close to 100% can be directly manufactured. [0003] The working process of laser selective melting is as follows: in the molding chamber, the powder spreading device moves horizontally to spread the metal powder from the powder supply cylinder on the molding cylinder evenly. Under the control of the computer, the laser beam is layered and sliced ​​according to the 3D model of the part. The cross-section information of the powder is selected to scan the powder, so that the metal powder in the target area is melted, and the geometric shape of a certain cross-section of the pa...

AI Technical Summary

Problems solved by technology

When the rotary powder spreading roller is spreading powder, the roller rotates relative to the powder surface, which is prone to electrostatic adsorption and powder sticking. At the same time, the powder spreading work surface of the roller is constantly changing, resulting in extremely unstable powder spreading quality.

The scraper type powder spreading device overcomes the defects of the powder spreading roller, and the quality of powder spreading is improved. However, because the shearing force is easily generated between the scraper type powder spreading device and the molding surface, once the powder scraper encounters an obstacle, it will generate a large The impact of the impact will cause the phenomenon of flying powder and powder, affecting the forming quality, and even destroying the parts, resulting in molding failure.

In addition, once the working surface of the scraper is damaged, the quality of subsequent powder spreading will be affected, and the scraper will be completely scrapped, so it must be replaced frequently, which costs a lot

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