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두 개의 압출빌렛을 사용하는 'Λ' 단면 앵글 구조재의 압출굽힘가공에 관한 연구
이경국,진인태,Lee K. K.,Jin I. T. 한국소성가공학회 2005 소성가공 : 한국소성가공학회지 Vol.14 No.2
In the present study about extru-bending of angle product, the bending of extruded angle products with the $'\Lambda'$ section and 'ㄱ', section can be obtained using two extrusion billets by the hot metal extru-bending machine with the two punches moving in the different velocity. The bending curvature can be controlled by the different velocity of billets through the two-hole container. This paper describes simulations and experiments of extru-bending process that can make bending during extruding by the difference of stem velocities. And they are applied to two kinds of dies, that is, one of them is conical dies with symmetry $'\Lambda'$ section and the other one is conical dies with asymmetry 'ㄱ' section. The results of the forming simulation by $DEFORM^{TM}-3D$ and results of experiments show that the bending phenomenon at the die exit during extrusion can be obtained with two extrusion billet by the two stems moving in the different velocity. And it was known that it is possible to design the structure of conical cavity of extrusion dies and to control the curvature of product through the simulation and experiment of extru-bending process.
이경국,진인태,Lee, Kyeng-Kook,Jin, In-Tai 한국금형공학회 2008 한국금형공학회지 Vol.2 No.5
It was investigated that two rods of aluminium can be welded by hot extru-pressure welding method with stepped welding dies, and that the welding pressure on the welding surface were analyzed by computer simulation according to the stepped shapes of welding dies. It was known by computer simulation that welding pressure on the welding section of rods welded using stepped welding dies. And it was known by experime- nts that two rods of aluminium can be welded on the end sections by hot pressure welding method using stepped welding dies without relative rotational movement of contacted aluminium rods needed for the purpose of friction heating and pressure.
이경국(K. K. Lee),이문용(M. Y. Lee),진인태(I. T. Jin) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
It was investigated that two plates of aluminum can be welded by hot extru-shear welding process with extru-shear welding dies, and that the welding strength and metal flow on the welding section were analyzed by computer simulation according to the welding variables such as inclined angle of cutter and overlapped length of plates and temperature of plates. It was known by computer simulation that welding strength on the welding section of plates could be influenced by the inclined angle of cutter and overlapped length of plates and temperature of plates. And it was known by experiments that two plates of aluminum can be welded on the end sections by hot extru-shear welding process using extru-shear welding dies, and that welding strength is the highest when inclined angle of dies is 70°, and overlapped length is 1.2㎜, and temperature is 520°, when aluminum 5052 two plates with 1.6㎜ thickness are used as welding material.