低音長笛設計與射出成型製程最適化

本研究主要目標為低音長笛設計與其製程最適化。研究先行設計一套低音長笛樂器造型，並利用田口品質工程作為實驗設計方法，同時藉由射出成型獲得低音長笛雛型，再以實際演奏及灰關聯理論將樂音資料進行蒐集與量化處理，並進行參數要因分析，藉由因子水準回應表與因子水準回應圖找出最適化參數組合。結果發現影響低音長笛音頻穩定性之主要因子水準為模溫50 ℃，其次為料溫215 ℃，最後為保壓壓力215 Mpa、射出時間4 s等，且由音頻分析發現所開發之低音長笛各單音音頻誤差皆小於管樂器音頻檢測標準2 %內，同時與傳統低音長笛音頻誤差相比，誤差值更是縮減了1 % ～2 %以上，證明研究所得之最適參數組合能提升低音長笛射出製程穩定性，期望未來提供管樂器製造業一套標準化設計製造流程，不僅能降低相關成本，更能提升產品品質與產量。

關鍵字

低音長笛；田口品質工程；音頻分析；灰關聯理論

並列摘要

This thesis aims to propose a most suitable process with Taguchi method and Grey Relation Analysis for the bass flute design through injection molding. First, Taguchi method was conducted as the experimental design, The actual performance and Grey Relation Analysis were utilized for collecting data and quantitative processing. Moreover, Factor Analysis was applied to find the optimal parameters from the factor response table and diagram. The results show that the stable audio frequency of the bass flute appears on the molding temperature 50 ℃, the material temperature 215 ℃, the dwell pressure 215 Mpa, and the injecting time 4 s. Besides, the audio frequency of the bass flute developed with audio analysis reveals the error 2 %less than the standard frequency of wind instrument. In comparison with the frequency of traditional bass flutes, the error is reduced 1 % ～2 %. It is proven that the studied optimal parameters could enhance the injection stability of bass flutes. It is expected to provide wind instrument manufacturers with a standard manufacturing procedure so as to reduce the cost and to promote the quality and yield of the products.