Flexible scraper device and selective laser melting powder laying device

Abstract

The invention relates to the technical field of metal powder laser melting additive manufacturing, and particularly discloses a flexible scraper device and a selective laser melting powder laying device comprising the flexible scraper device. The flexible scraper device comprises a scraper support and a scraper body, wherein the scraper body comprises a scraper rigid body and a flexible scraper; and limiting collision blocks are arranged at the two ends of the scraper support correspondingly. According to the flexible scraper device, through effective combination of rigid materials and flexible materials, the problem of installation deformation of a traditional flexible scraper is solved; and in addition, when the flexible scraper device is applied to the selective laser melting powder laying device, the strength needed by scraper powder laying is guaranteed, collision between the scraper and powder bed protruding points can be effectively avoided, equipment stagnation in the powder laying process is greatly reduced, the flatness of the powder laying face is protected, and the precision of a formed workpiece is effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of metal powder laser melting additive manufacturing, in particular to a flexible scraper device and a selective laser melting powder spreading device. Background technique [0002] Selective laser melting (SLM) technology is a kind of additive manufacturing technology, which uses high-energy beam laser to melt pre-laid thin-layer metal powder layer by layer to form high-performance complex metal parts. Compared with metal processing methods such as conventional machining, casting, forging and welding, SLM has outstanding advantages in forming complex structures such as complex inner cavities and flow channels, as well as structures that cannot be realized by traditional methods such as micro-grids. [0003] In the forming process of metal additive manufacturing, the flatness of powder coating is one of the key indicators for evaluating the quality of finished products. However, since the energy of the laser...

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Problems solved by technology

Among them, the rigid scraper is made of metal or ceramic material, and the rigid scraper will collide with the bumps produced during the powder spreading process. This impact force not only directly affects the surface accuracy of the laminated manufacturing, but also causes damage to the scraper. In severe cases, it even affects The accuracy of the mechanical structure of the entire equipment requires recalibration and restoration of the accuracy of the equipment; the flexible scraper is made of flexible materials such as rubber, which can effectively avoid the collision between the scraper and the bumps of the powder bed, but due to the characteristics of flexible materials such as rubber, screws or metal When the briquetting block is connected to the main bracket of the scraper, it will cause the scraper to deform, and it is difficult to guarantee the straightness of the scraper itself, which will affect the quality of powder spreading

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