7075鋁合金鑄鍛合一製程之研究

Study of Hybrid Casting and Forging Process for 7075 Aluminum Alloy

李忠翰 ； 張峰旗 ； 黃文星(W. s. Huang) ； 吳春甫(C. F. Wu) ； 楊俊彬(Jin-Bin Yang)

《鍛造》 11卷4期 (2002/11) Pp. 74-79

摘要

鑄鍛合一製程是結合了鑄造與鍛造的優點，先鑄造一個接近最後成品（near net shape）的形體再進行鍛造。如此一來，可以減少因鑄造而產生的內部缺陷，如氣孔及縮孔；又可以減少鍛造製程的程序，如此可以大幅降低製造的成本。本研究採用了7075鍛造用鋁合金來進行鑄鍛的實驗。研究中設計5mm、10mm及15mm三種厚度的鑄件進行鍛造，以求得不同的預成型厚度需要多少的壓縮率才可以完全消除內部的孔洞。由實驗的結果得知7075鋁合金之5mm厚度的試片需要29.69%的壓縮率才可以完全消除孔洞；10mm厚度的試片需要40.86％的壓縮率才可以完全消除孔洞；而15mm厚度的試片需要52.03%的壓縮率才可以完全消除孔洞。

關鍵字

7075鋁合金,鑄造,鍛造,鑄鍛合一

並列摘要

Hybrid casting and forging process combines the advantages of casting and forging process. It is desirable to cast a near net shape perform first and subsequently forge it. The cast defects such as air holes and shrinkage porosity are eliminated by forging and the forging procedures are reduced. Therefore, the cost can be reduced. In this study, castings with stepwise cross section are die cast with 7075 aluminum alloy. The stepwise cross section has three different thicknesses, which are 15mm, 10mm and 5mm. The aim of this study is to obtain how much compression ratios are required to eliminate the porosities inside the casting with various thicknesses, where porosity contents are different. The experimental results show that for 7075 aluminum it requires a compression ratio of29.69% to eliminate all the porosities in the casting section of 5mm in thickness. For the casting section of 10mm in thickness, it requires a compression ratio of 40.86% to eliminate all the porosities. For the casting section of 15mm in thickness, it requires a compression ratio of 52.03% to eliminate all the porosities.

並列關鍵字

7075 Aluminum,Casting,Forging,Hybrid Casting and Forging