Effects of simulation conditions on evaluation of tool temperature in hot extrusion-forging

Minami, Akihiro; Marumo, Yasuo; Saiki, Hiroshi; Ruan, Liqun; Shizuma, Osamu

doi:10.1016/j.jmatprotec.2006.04.077

Cited by 6 publications

(2 citation statements)

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“…Furthermore, flow stress should be also minimized. In addition, flow stress value is abruptly changed according to the strain rate under hot temperature, thus extrusion speed should be slowed down to minimize the flow stress [7][8][9][10][11][12]. The opposite side of the circular cylinder can be produced as an embossing by the compression load from the die.…”

Section: Design Of Plastic Workingmentioning

confidence: 99%

“…Therefore, a process design was executed to make the forming possible from two processes of hot extrusion and warm forging. Process design and die design drawing on experience from the workers at the site would not only increase process development time, but also could increase process cost and die cost due to trial and error [5][6][7][8][9][10]. For complex shapes, a simulation using a forming analysis program should be necessarily implemented.…”

Section: Introductionmentioning

confidence: 99%

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Simulation and Experiment of Manufacturing Process for Structural Aluminum Parts with Hard to Plastic Forming

Jin

2019

Metals

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A process comprising a hot extrusion process and a warm forging process was designed to form an umbrella-shaped aluminum structural component with a high degree of difficulty for the plastic forming method. A circular cylindrical part was extruded with a hot extrusion process, and then an embossing part was produced with a warm forging process. The formability and the maximum load required for forming were then determined using a forming analysis program. The hot extrusion process was executed at 450 °C under the extrusion speed at 6 mm/s, while the warm forging process was executed at 260 °C under the forging speed at 150 mm/s. The simulation results showed that the load required for hot extrusion was 1019 ton, while the load required for the warm forging was 534 ton. The umbrella-shaped part was manufactured by using a 1600 ton capacity press. The graphite lubricant was coated on the mold as well as the material. A forming experiment was performed under the same condition with the simulation condition. The portion where extrusion was done became elliptical with the α-Al phase elongated towards extrusion direction. Whereas, the α-Al phase became circular in the forged portion. The tensile strength value was found as 345 MPa, while elongation rate was 12%. Meanwhile, Vickers hardness value at the extruded portion was 105 HV, and it was 110 HV at the forged portion.

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