Selective laser melting device

Abstract

The invention discloses a selective laser melting device. The selective laser melting device comprises a rigid powder laying device, a milling tool cutting device and a control device. The rigid powder laying device comprises a scraping knife mechanism, a guide rail mechanism, a power mechanism and an overcurrent detection mechanism. The power mechanism drives the scraping knife mechanism to movealong the guide rail mechanism. The overcurrent detection mechanism is arranged on the scraping knife mechanism and is connected with the control device. The milling tool cutting device comprises a mechanical arm and a milling tool. The control device is used for receiving and analyzing detection information transmitted by the overcurrent detection mechanism and controls the mechanical arm and themilling tool to realize the high point cutting action according to the detection information. The selective laser melting device conducts forced scraping on high points by means of the rigidity of ascraping knife in the powder laying process. If the high points are cut off by the scraping knife, the powder laying action can be completed smoothly. If the scraping knife gets stuck, cutting of thehigh points is realized through monitoring of the overcurrent detection mechanism and cutting of the milling tool cutting device. It is guaranteed that no high point exist in the manufacturing process. The defect rate of parts is greatly reduced. The precision of the parts is improved.

Description

technical field [0001] The invention relates to the technical field of laser selective melting, in particular to a laser selective melting device. Background technique [0002] Additive Manufacturing (AM) technology is a technology that uses the method of gradually accumulating materials to manufacture solid parts. Compared with the traditional material removal-cutting technology, it is a "bottom-up" manufacturing method. Selective Laser Melting (SLM) direct manufacturing technology, also known as metal 3D printing technology, is the cutting-edge technology of additive manufacturing. Before processing, first slice and discretize the CAD model of the part through professional data processing software and add necessary support structures, and then plan the scanning path. The processed data will contain contour information that can control the movement of the laser beam. Then import this data into the molding equipment, the computer transfers the profile information layer by l...

AI Technical Summary

Problems solved by technology

However, there are unavoidable defects in the flexible powder spreading device. When the scraper passes the high point, this high point is very likely to become a source of defects, which increases the probability of air holes, inclusions, cracks, etc. in the finished product

In addition, most of the waste slag generated during the processing is taken away by the circulating air, but a small part will fall on the powder bed. After the waste slag falls into the powder bed, it also forms high points. The flexible powder spreading device cannot take away these high point waste slag , but press it into the powder bed, affecting the quality of the final product

[0004] It can be seen that the above-mentioned existing laser selective melting equipment obviously still has inconvenience and defects in structure, method and use, and needs to be further improved urgently.

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