Preheating powder spreading device for selective laser melting metal 3D printing

Abstract

The invention discloses a preheating powder spreading device for selective laser melting metal 3D printing. The preheating powder spreading device comprises a powder supply tank body, a heat conduction cylinder, a powder spreading tank body, a powder feeding roller body, powder spreading filter screens, a powder spreading brush and a forming platform; and powder recycling boxes and a forming working cylinder are arranged at the bottom of the forming platform, a powder spreading mechanism and a powder supply preheating mechanism are installed above the forming platform, the powder spreading filter screens are arranged in a ">" shape, and a plurality of powder spreading through holes are formed in the powder spreading filter screens. According to the preheating powder spreading device, the device only needs to drive the powder spreading brush to move left and right to spread the powder, so that the energy consumption is saved; the plurality of powder spreading through holes are formed inthe powder spreading filter screens, metal powder can be dispersed more uniformly in the process of sliding down of the metal powder, and the paving efficiency is higher; large-particle metal particles can directly fall into the powder recycling boxes along slag falling grooves in the two sides, and the 3D printing product quality problem due to doping of the large-particle metal particles is avoided; and the metal powder is preheated in advance, the time for heating and melting the paved metal powder is saved, and the 3D printing efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of laser selective melting of additive manufacturing, and more specifically, it relates to a preheating powder spreading device for 3D printing of laser selective melting of metals. Background technique [0002] SLM metal 3D printing is called selective laser melting 3D printing. Metal parts are directly formed by melting metal powder by laser. Laser selective melting (SLM) is one of the research hotspots in the field of additive manufacturing technology. It is used in complex molds, personalized medical parts, It has outstanding technical advantages in the fields of aerospace, automobile, artwork and electronic fine products. [0003] In real life, when it is necessary to print and grow thin plate products with small and complex structures on thin plates, for example, printing artwork or patterns on thin plates, printing fine components on circuit boards, etc., the thin plate products generally have a small thickn...

AI Technical Summary

Problems solved by technology

Such products are difficult to process and costly to use traditional processing methods. Using SLM metal 3D printing can solve this problem very well.

[0004] At present, in the SLM metal 3D printing technology, the laser selective melting forming system generally uses the powder spreading method to ensure the levelness and uniformity of the metal powder layer. Therefore, the scraper part related to the powder spreading effect directly affects the molding quality of the part.

For example, the Chinese patent (authorized announcement number: CN206104881U) discloses a laser selective melting SLM equipment mobile hopper type two-way powder spreading device, although it can realize the tile processing of metal powder, but it uses the whole powder spreading device to move left and right Powder spreading in this way consumes a lot of energy, and the powder spreading operation is complicated. Secondly, the two-way powder leakage powder spreading device outputs the powder from both sides, and then spreads the powder by the spreading brush, which is not conducive to the uniform dispersion of the metal powder, and the spreading efficiency is low. The large particles of metal doped in it cannot be separated, which affects the quality of 3D printing, and does not have the function of preheating, resulting in a long time for the flat metal powder to be heated to melt, reducing the efficiency of 3D printing

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