以快速原型技術製作不鏽鋼工件

Manufacturing stainless steel workpiece with rapid prototyping technology

陳威宇(Wei-Yu Chen)

指導教授 ： 嚴孝全 ； 湯華興

國立臺北科技大學/機電學院/機電整合研究所/碩士(2013年)

摘要

現有商品化的金屬快速原型機，例如EOS M280，價格非常昂貴，難以推廣。本研究目的為證實以瀝鑄法快速原型製程製作不鏽鋼工件的可行性，期望將來能開發出較低成本的金屬快速原型機及製程。
使用快速原型製程製作不鏽鋼生胚，再將生胚高溫燒結成緻密金屬。以市售粒徑大小10μm的316L不鏽鋼粉經乾球磨後，分篩出細粉末，並做出工件比較其差異。一般較細的金屬粉末，鋪層時，顆粒排列較緊密，所以燒結後較緻密，但價格昂貴。而粗粉末雖燒結後緻密度較低，但價格便宜，容易取得，且工件仍可使用。粗粉末的顆粒較重，在漿料儲存槽中較易沉澱，故使用一個攪拌系統，使粉末能在製作時不發生沈澱，使舖層順利，並得到較均質的工件。再由阿基米德原理量測生胚與燒結後的緻密度，並計算其x、y、z三軸之收縮率。
實驗結果顯示，使用較細之金屬粉末製作之生胚工件可得到較佳的性質，且燒結完成後的缺陷也較少。

關鍵字

快速原型 ； 不鏽鋼

並列摘要

The existing commercialized rapid prototyping apparatuses for producing metal parts, such as EOS M280, are is very expensive, and is difficult to promote. The aim of this study is verification of the feasibility of manufacturing stainless steel workpiece with slip casting of rapid prototyping. Based on this study, we hope a process and a lower-cost a rapid prototyping apparatuses for producing metal parts can be developed in the future,.
The stainless steel green part was fabricated with the slip casting process, and then sintered at high-temperature to be a densed metal part. The commercial Stainless steel powder(316L, Φ50=10μm) was milled, and then fine and coarse particles were separated by sieving. Workpieces were fabricated by fine and coarse particles respectively, and were compared with each other. Generally, the particle of the fine metal powder can be closer during layer paving, and result in a metal part with high density after sintering; but the fine powder is it’s more expensive. Although the part made of coarse particles can only obtain low density metal part after sintering, but the coarse particles it is cheaper and affordable; the workpiece is still can be used. Because sedimentation of the coarse particles occurred in the slurry storage vessel during the layer casting, a blender was employed to prevent the sedimentation, and then uniform workpieces were obtained. The density and uniformity of the green part and sintered part were observed. The shrinkage along the X-Y-Z axis was measured as well.
The experimental results showed that higher density and strength were achieved when the green parts were fabricated of fine powder. Besides, the sintered parts made of fine powder had less defects than that made of coarse powder.

並列關鍵字

rapid prototyping ； stainless steel

參考文獻

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