自行車花鼓常以冷鍛製程製造,以達到其應有的形狀與強度,然而業界對此製程之規劃與模具設計大部分仍憑著經驗與嚐試錯誤,極需有學理根據之製程設計與分析,以提高製品品質,降低生產成本。本文提出由已知之傳統製程道次進行製程改善的方法。花鼓冷鍛之製程設計,其中成形力量、材料變形及沖頭負荷等採用有限元素法模擬分析,擠壓速度40mm/sec、胚料退火三次達到製程最佳,原三道次縮短為二道次胚料可充填飽滿,降低不良29.45%。顯現本文研究結果比傳統製程可減少道次、降低不良率,減少成本損失之優點。
Normally a bicycle Hub is made by cold forging to form its required shape & strength. However, biking industry largely depends on trial and error to design a mold and manufacturing process. Thus, it is necessary to utilize theories to analyze design and process for a better quality and lower cost. This document is exactly meant to do so. In a manufacturing process of a cold forged hub, the shaping force and material deformation and a load of a mold punch are analyzed by using DEFORM to evaluate process courses and pre-forming ability. For instance, a forged part which is annealed 3 times and punched at a speed of 40mm/sec. would achieve most optimum stage by downing 3 courses to 2 and thus reducing error rate by 29.45%. this research shows has advantages over conventionally manufacturing process and workability.