SLM (selective laser melting) method for processing horizontal suspended structure without longitudinal supports

A technology of vertical support and laser melting, which is applied in the direction of additive processing, process efficiency improvement, additive manufacturing, etc., can solve problems such as difficult processing, and achieve the effects of reducing production costs, enhancing capabilities, and simplifying processing and post-processing processes
CN110369727AActive Publication Date: 2019-10-25INTELLIGENT MFG INST OF HFUT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INTELLIGENT MFG INST OF HFUT
Publication Date
2019-10-25

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Abstract

The invention discloses an SLM (selective laser melting) method for processing horizontal suspended structure without longitudinal supports. The method is characterized in that an initial layer, a repair layer and a conventional layer are sequentially formed; the initial layer is printed and formed by adopting a light spot in a defocused state in a scanning mode lower than the conventional rate, so that Plateau-Rayleigh instability occurs to each melt channel in the initial layer, and the initial layer with a specific texture structure is formed; the repair layer is printed and formed on the upper surface of the initial layer in a scanning mode higher than the conventional speed and in a continuous laser output mode by adopting a light spot in a focused state, and transition from transitional process parameters to conventional process parameters is completed within the set processing layer number; the conventional layer is printed on the upper surface of the repair layer by adopting conventional process parameters, and the horizontal suspended structure without longitudinal supports is formed. According to the method, the stable horizontal suspended structure is directly formed without the longitudinal supports, and the practical application of the SLM technology is effectively expanded.
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Description

technical field

[0001] The invention relates to the technical field of additive manufacturing, that is, 3D printing, in particular to a method for forming and processing a horizontal suspended structure in selective laser melting (Selective Laser Melting-SLM) processing of metal materials. Background technique

[0002] Selective laser melting (SLM) is one of the mainstream technologies of metal additive manufacturing. Based on the concept of layered manufacturing, this technology obtains the corresponding processing data by establishing a digital model of the workpiece, layering the slices, and planning the path, and then uses the laser to melt the workpiece. Print out layer by layer. Selective laser melting (SLM) is different from the traditional cutting manufacturing process. In theory, its manufacturing process is not limited by the structure of metal parts, and can be widely used in aerospace, medical and automobile manufacturing and other fields.

[0003] The suspended...

Claims

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