鈦合金超塑性成形及擴散接合技術研究

Superplastic Forming and Diffusion Bonding of Titanium Alloys

曾炳瑋(Ping-Wei Tseng)

指導教授 ： 鄭榮和

國立臺灣大學/工學院/機械工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.00057

摘要

本研究為配合中山科學院二所以SPF/DB製程製作大型工件，協助院方對於製程參數的掌握。研究中使用Ti-6Al-4V為材料，並借助商用有限素軟體「ABAQUS」建立三維有限元素模型。研究主軸共有兩大部份：

第一部份為超塑性吹製之模擬分析與驗證；探討傳統吹製方法：定壓及定應變率控制方式的優缺點；另外加入了定局部流集中因子控制方式，以大幅提高生產效率。

第二部份則為超塑性成形及擴散接合複合加工技術製程分析：先回顧擴散接合理論，提供一個可以估算接合所需時間的程式以做為決定接合時間的依據；再藉由模擬分析來解決由於內外板使用板材厚度之不同，所造成成品於靠近補強處會產生不平整的現象。

關鍵字

中空結構 ； 有限元素分析 ； 超塑性成形 ； 局部流集中因子 ； 破壞判準 ； 擴散接合

並列摘要

Superplastic forming is a modern industrial manufacturing technology，which can form complicated products. Diffusion bonding is a kind of solid bonding methods，and the bonding strength could be as strong as source materials. Since the forming conditions of these two forming processes are similar，they can be proceeded in the same time，that is what so called “Superplastic and Diffusion bonding technology(SPF/DB)” .

In this research，we created three-dimensional finite element models to analyze SPF/DB forming process by using commercial finite element analysis software ABAQUS. The report is divided into two main parts：The first part is the simulation and analysis of superplastic blow forming process，including the verification of analysis results. Since traditional superplastic forming methods，such as “constant pressure” or “constant strain rate” control methods are not so efficient，we applied “constant flow localization factor” method to control the value of flow localization factor as a constant. Hence，the producing efficiency can be improved enormously.

In the second part，we discuss the existence of grooves which occurred on diffusion bonding products. The solution is to change the thickness of outer sheet，and we can find out the initial thickness of outer sheet by finite element analysis.

並列關鍵字

SPF ； SPF/DB ； flow localization factor ； finite element analysis ； fracture criterion ； DB ； diffusion bonding ； hollow structure ； superplastic forming

參考文獻

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