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精密低壓射蠟模具快速製造技術之開發

Development of Rapid Manufacturing for Precision Low Pressure Wax Injection Mold

摘要


精密鑄造技術被視為一種大量生產金屬件的經濟方法。運用融熔擠製沉積成型快速原型系統可以快速製作出低壓射蠟模具,然而所製作出的快速模具之尺寸精度與表面精度卻不理想,主要的原因為快速模具係運用層加工來製作,為了解決此一問題,本研究提出一個高尺寸精度與低表面粗糙度之低壓射蠟模具快速製造技術。研究結果發現,運用此低壓射蠟模具所製作之蠟型不但具有優良尺寸精度,而且還具有優良表面粗糙度。蠟型之尺寸相對誤差率由1.76%被改善至0.66%,表面粗糙度改善率可以達85.71%。本研究所提出之精密低壓射蠟模具之尺寸修整補償涵蓋方法簡單、製程具備彈性、縮短模具開發時間、無複雜數學運算、降低設計尺寸錯誤、低製作成本以及優良尺寸精度。

並列摘要


Investment casting process is considered as an economic method for mass production of metal parts. Improvement of mold surface quality and geometric accuracy in the fused deposition rapid tooling is a major concern. In this paper, a new technique is proposed for rapid manufacturing a low pressure wax injection mold with acceptable surface finish and acceptable dimensional accuracy. Wax patterns produced from this mold have not only better dimensional accuracy but also better surface finish. The average relative error of dimension of wax patterns can be reduced from 1.76% to 0.66%. Surface roughness improvement rate of wax patterns of up to 85.71% can be achieved. Advantages of this technique include low manufacturing cost, simple manufacturing process and flexible process capability.

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