精密鑄造脫蠟法自1940年代即被應用到工業界，目前主要應用於航空太空及一般機械產業，期間也經過多次的開發與改良，但鑄件冷卻後所產生的熱變形問題卻一直無法被完全改善。
　　本文利用有限元素數值分析軟體ABAQUS，對航空引擎中一個鎳基INCONEL738LC軸對稱擴散器的熱變形鑄件，進行平面度與真圓度等問題的熱矯直改善研究，將鎳基材料假設成完全塑性和線性加工硬化兩種材料行為，作為此鑄件之材料參數依據，並以850℃作為熱矯直之溫度。
　　在本文所設之位移拘束與兩種熱變形相互影響最小的條件下，此鑄件的平面度變形量3~9mm時，完全塑性材料行為所需的熱矯直力為15.1~19.4kN(矯直壓力3.5~4.5MPa)；線性加工硬化材料行為所需的熱矯直力為23.7~36.7kN(矯直壓力5.5~8.5MPa)。鑄件真圓度直徑變形量 1~4mm時，線性加工硬化材料行為所需的熱矯直力為12.2~16.5kN(矯直壓力17~23MPa)；線性加工硬化材料行為所需的熱矯直力為17.9~25.1kN(矯直壓力25~35MPa)。因受工件結構剛性差異的影響，在相同變形量條件下，真圓度變形所需之熱矯直力與平面度變形所需之熱矯直力會有所不同。

　　The investment casting has been used in industry since 1940 year. The airspace industry is the main users of investment castings. It has been improved several times. However, problems of thermal deformation are still under investigation.
　　The objective of this thesis is to study thermal deformation of the shell-like casting of engine parts with finite element method by ABAQUS. In the simulation of hot-strengthening, the material is assumed to be either perfectly plastic materials or linear working hardening materials.
　　Under the specified constrained conditions, as the thermal deformation along axial direction is ranged 3~9mm, the hot-straightening force for perfectly plastic materials and linear working hardening materials are 15.1kN~19.4kN and 23.7~36.7kN, respectively. As the thermal deformation along radial direction is ranged 1~4mm, the hot-straightening force for perfectly plastic materials and linear working hardening materials are 12.2~16.5kN and 17.9~25.1kN, respectively. Under the condition of the same thermal deformation, the required hot-straightening force for flattening case and rounding case are quite different.

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