Selective spreading device and spreading method

Abstract

The invention provides a selective spreading device, which is applied to a 3D printing process. The selective spreading device comprises a developing drum, a developing module, a material bed, and a driving device; the developing surface of the developing drum is in a truncated cone shape and rotates around a first axis; the developing module is used for forming a printing material layer of a preset pattern on the developing surface of the developing drum during rotation of the developing drum; the material bed rotates around a third axis and is cooperated with the developing drum for receiving the printing material layer on the developing drum; and the driving device is used for driving relative motion between the developing drum and the material bed so that the distance between the developing drum and the material bed can be enlarged step by step or continuously enlarged during printing. The selective spreading device in the invention can greatly improve the printing speed, is suitable for multiple forming methods and is stronger in application type.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a selective material laying device and a material spreading method. Background technique [0002] Existing 3D printing devices, such as SLS (Selective Laser Sintering), SLM (Selective Laser Sintering Melting), or 3DP (selective spraying of binders on powder beds to make models layer by layer) and other printing methods, on the workbench (or called Powder bed) A layer of powder material is laid with a material laying device, and then controlled by the control system, according to the information of the printed model, the laser beam is controlled to irradiate the laid powder layer or the binder injector is used to selectively spray the laid powder to form Selective curing layer. Then the worktable is lowered by one material layer thickness, and then the powder layer is laid and selectively solidified on the powder layer, and this process is repeated until the 3D model is print...

AI Technical Summary

Problems solved by technology

The material laying device lays the printing material through reciprocating motion. There is an empty stroke in the reciprocating motion, and there is a start-stop process. The material spreading speed is slow, and often only a single material can be laid, and the laying of composite materials cannot be realized generally; in addition, the above-mentioned laying Material and curing are carried out in time, further affecting the printing speed

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