Reciprocating Powder Spreader for Selective Laser Melting

Abstract

The invention discloses a reciprocating powder laying device for selective laser melting. The reciprocating powder laying device comprises a powder laying mechanism which can lay powder in a reciprocating manner. The powder laying mechanism comprises powder laying box which can transversely move in a reciprocating manner and a partition, wherein the partition is disposed in the powder laying box, powder laying cavities are formed on two transverse sides of the partition, the lower end of the partition communicates the powder laying cavities and powder outlets below the powder laying box in an openable manner. When the powder laying box moves, the partition can transversely swing to allow the rear powder laying cavity in the advancing direction of the powder laying box to be communicated with the powder outlets. The reciprocating powder laying device has the advantages that twice powder laying is performed by one reciprocation, no idle running exists in the middle, time waste is reduced greatly, work efficiency is increased, pausing during powder laying can be avoided, and the device is suitable for large parts; an upper power feeding manner is used, compactness in structure is achieved, overall structural space is reduced greatly, circulating power feeding can be achieved, sufficient powder can be fed at one step, and powder can be saved effectively.

Description

technical field [0001] The invention relates to the field of powder laser sintering additive manufacturing, in particular to a reciprocating powder spreading device for selective laser melting. Background technique [0002] Powder spreading is an important part of selective laser melting. The powder spreading effect affects the compactness of the powder, which in turn directly affects the molding quality of the part. During the powder spreading process, the compactness of the powder is related to factors such as the flow of the powder and the pressure on the lower layer of powder. The existing powder spreading method is composed of a powder supply bin, a forming bin, a powder collecting bin, and a scraper, etc., and is realized by moving the powder supply bin upward to push out excess powder, and the scraper moves and spreads in the forming bin. Usually an additional feed bin is moved up to provide the powder. Its disadvantages are: adopting the bottom powder supply method...

AI Technical Summary

Problems solved by technology

Its disadvantages are: adopting the bottom powder supply method, the additional powder supply chamber increases the overall structural space, the powder amount needs to be added at one time, and the powder supply cannot be carried out in a cycle; the scraper needs to move back and forth to complete a powder coating, resulting in an empty stroke , a waste of time; not suitable for the processing of large parts; for powder spreading on large platforms, the uniformity of powder spreading before and after the powder spreading process cannot be guaranteed; and the structure is complex and the control is complicated

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