중공 장축 대두 실린더 제조를 위한 슬라이딩 금형 단조 공법의 개념설계
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In this paper, a new forging process with a controlled sliding die is proposed to fabricate a long hollow cylinder with large head. The conceptual design is given. In the process, an end of seamless pipe of initial material is partially heated. A sliding die is used to prevent the heated region of the material from being buckled and its velocity is controlled to exert forming load upward in the early stroke and downward in the remaining stroke on the material. Finite element predictions of the conceptual design are given, indicating that the metal flows are sound even if the thickness and height of the head is very large compared to the thickness of the cylinder.