| Summary: | 碩士 === 國立虎尾科技大學 === 機械與電腦輔助工程系碩士班 === 104 === Since 2008, 3D printing technologies have been enhanced considerably following the expiration of 3D printing patents. Previously, 3D printers were limited to providing product proofs for designers; current technologies overcome challenges typically associated with manufacturing difficulties, the inability to process directly, and lengthy lead times because 3D printers can directly print components for end products.
This study modified the structure of existing 3D printers to construct a 3D metallic powder-sintering device through integrating printing processing technology with metallic powders The structure included a powder feeder, compacting mechanism, and substrate-plate lifting mechanism. Copper was used as the powder material for selective laser sintering. The substrate plate was covered with an evenly distributed layer of metallic powder, which was levelled using a flattener The sintering device fused the selected objects by selectively sintering the metallic powder with a laser beam, and the feeding mechanism distributed a new layer of powder after the substrate plate was lowered. The steps of feeding, levelling, and laser sintering were repeated until the final product was produced.
A dial indicator was employed to measure the repeatability of the x- and z-axes. Through the powder-feeding experiment, we determined that the thickness of each layer of the sintered body can be adjusted between 0.1 and 0.4 mm to ensure the feasibility of a simple 3D metallic powder-sintering mechanism. Furthermore, in the powder-sintering experiments, parameters such as the laser power, velocity, frequency, and path interval were adjusted An electron microscope and Vickers hardness tester were employed to inspect the sintered products after the sintering experiment. The Taguchi method was used to obtain the optimal combination of parameters.
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