具高深寬比深微孔精微零件之擠壓成形研究

A study of extrusion for the micro-meso parts with high aspect ratio hole

李俊賢(Chun-Hsien Lee)

國立虎尾科技大學/工程學院/動力機械工程研究所/碩士(2005年)

摘要

本研究係對具高深寬比深微孔精微零件之擠壓進行研究，利用具有盲孔之胚料填入填充料進行前向擠壓，以獲得具高深寬比深微孔的精微零件。應用有限元素模擬分析軟體DEFORM進行模擬分析，以暸解其變形趨勢發展，再利用自行建構的精微擠壓成形模具進行前向擠壓實驗，將模擬與實驗的結果進行分析比較。
研究後發現：擠製比越大時所需之擠壓負荷也隨之提升，而且填充料易穿出胚料造成破壞。填充料直徑和材料強度係數越小，擠壓件內孔徑的精度較高。當胚料和填充料的材料強度係數差異過大時進行有限元素模擬分析較為不易。

並列摘要

The study was designed to obtain the micro-meso parts with high aspect ratio hole by the extrusion processes. The forward extrusion was employed to process the billets with blind holes filled with fillers. The finite element simulation package DEFORM was also applied to analyze the tendency and development of the billet deformation in micro-extrusion. Then, the experiments of micro forward extrusion were conducted using the forming die designed and manufactured by the author. The comparison of the results between the simulation and experiments was also analyzed.
Results of the study indicate that the higher the extrusion ratio is applied, the higher the extrusion load will be. In addition, the extrusion parts tend to fail when the fillers are bursting out from the billets. The precision of inside diameter in the extruded parts is higher when the diameter and materials strength coefficient of the filler are small. Furthermore, it is much more difficult to utilize the finite element simulation when the difference of the material strength coefficient between the billets and the filler exist significantly.

參考文獻

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