植牙用鈦合金螺絲之打頭成形與製程設計

Process Design and Heading of Titanium Alloy Screws for Dental Implants

黃永茂(Yeong-Maw Hwang) ； 陳博鴻(Bo-Hong Chen) ； 閻其暘(Chi-Yung Yen)

《鍛造》 26卷3期 (2017/10) Pp. 7-16

摘要

鈦合金具有高強度、質量輕、耐腐蝕，且對人體無害，因此被廣泛運用在航太產業，近年來則開始應用在生醫領域。本研究利用有限元素法進行鈦合金Ti-6Al-4V植牙螺絲之打頭以及輾牙製程模擬，探討各項製程參數對鍛造力與成形性的影響。本研究首先透過Gleeble 3800熱機模擬試驗機進行鈦合金之圓柱壓縮試驗，再將所得到不同溫度及應變率之塑流應力匯入DEFORM有限元素分析軟體進行打頭與輾牙製程模擬。打頭製程分為軸部成形與頭部成形兩個道次，藉由改變第一道次衝程以及兩道次沖頭速度可以求得較省時且所需鍛造力較小、成品外形無缺陷之較佳製程條件。輾牙製程模擬則為探討牙板間相對位置及摩擦因子對螺紋外型與高度之影響。

並列摘要

Titanium alloy with high strength, light weight, corrosion resistance, and is not harmful to humen, so it is widely used in aerospace industry. Recently, it began to applied in biomedical fields. The finite element method is adopted to analyze the heading and threading of dental implants of Ti-6Al-4V, and the effects on forging force and formability of process parameters are investigated. At first, the flow stresses of different forming temperatures and strain rates could be obtained by doing compression test of Ti-6Al-4V from Gleeble 3800. They were input into DEFORM, the finite element analysis software to perform heading and threading process simulation. There are two stages of heading process, one is forming the shaft of the screw, another is forming its head part. The stroke of first stage and punch velocities of the two stages were adjusted to obtain a lower forging force, time saving and non-defect products. The effects on the thread shape and height of the relative position between the screw dies and the friction factor between die and billet were discussed in the FE simulations of the threading process.