3D printing system and method for improving interlayer connection strength through irradiation heating

Abstract

The invention discloses a 3D printing system and method for improving interlayer connection strength through irradiation heating. An infrared lamp tube is of an annular structure, and is arranged on a printer nozzle in a sleeve mode through a fixing device, and a semi-crystalline polymer material for printing passes through the center of the infrared lamp tube to achieve preheating; and a printed layer and a layer to be printed arranged on a substrate below the printer nozzle are secondarily heated through the infrared lamp tube. According to the system and method, the connection strength between layers is effectively improved; and meanwhile, the heat preservation effect is achieved for a period of time, and the interlayer connection can be effectively improved on the basis of previous preheating.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a 3D printing system and method for improving interlayer connection strength by using radiation heating. Background technique [0002] As an advanced manufacturing technology that has developed rapidly in recent years, 3D printing has been widely used in the fields of biomedicine, aerospace and automobile manufacturing. The most common low-cost printing method in the 3D printing method is the melt extrusion molding method. The main process of the melt extrusion molding method is to heat the continuous filament through the nozzle to reach a semi-liquid state, and then extrude it on the platform or before A method on the print layer. The main advantages of the melt extrusion method are its low cost, fast printing speed, and relatively simple printing process. However, due to the strong anisotropy inherent in the method itself, the printed parts are in the printing ...

AI Technical Summary

Problems solved by technology

Although laser heating has good precision and high heating efficiency, the whole system is complex and costly; the most critical point is that when using laser for preheating, the relative position of the entire laser preheating device and the melt extrusion nozzle It remains unchanged, that is, the position of the laser preheating will not switch with the switching of the printing path. Only when the print head prints in a certain direction can a good preheating effect be achieved, so there must be a uniform printing In the process of layering, the laser cannot be preheated in advance, resulting in uneven connection strength between layers, and for high melting point semi-crystalline polymer materials, the temperature of the printing material at the nozzle is different from the ambient temperature Larger, which causes the temperature of the material to dissipate quickly after printing, and the material between the layers does not have enough time to complete the diffusion, resulting in a lower connection strength between the layers. This is also the current stage to improve An urgent problem to be solved in the connection strength between layers

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