| Summary: | 碩士 === 國立高雄第一科技大學 === 機械與自動化工程研究所 === 103 === With the competition in the industry, the development of the forging technology for material saving, production high speed and size precision, which aims to reduce production costs and improve the product competitiveness. To achieve the above objectives of development, that should be introduced into the multi-action closed forging module technology, while the manufacturing process is mainly used for multi-axis hollow bore pipe fittings. In this study, the development and research process of horizontal multi-action hot forging for vehicles of the three axes pipe fittings. Forging near net shape and have hollow bore of forgings, which material used SUS 304 stainless steel.
The study by CAD-aided design software to design the mold, cutting size and the forging process parameters, and then use finite element software DEFORM-3D to analyze material formability in hot forging. After confirm the feasibility, then analysis of billet’s forming temperature to the forming load and die stress. Finally, design the actual structure with overall module, mold design, manufacturing and verification for forging machine.
By DEFORM-3D simulation results that forgings flowability, stress, strain and the die stress are normal and reasonable. It’s surface without cracks or defects, and the forging of multi-action can reduce the billet’s volume than conventional forging about 63631.15mm3, even can save about 35% of the material. In analysis of billet’s temperature to the forming load and die stress, the billet can be learned when the forming temperature is higher, the lower the forming load and die stress. When the forming temperature between 950°C~1050°C, the forming load and die stress values significantly lower. When heated to 1250°C, its load and stress is beginning to show slowing down.
In forging experiment, when the billet temperature at 950°C~1050°C, the material formability is poor that caused the forming force is greater than the preset clamping force 450tons, the upper and lower die are distraction that the forgings size is too large and not to fill. When the billet temperature to 1150°C~1250°C, the forging surface quality without much affected by temperature differences, and the forming force gradually decreased and are able to preset the 450tons clamping force to support, and fully formed. The results showed that the forging flow lines is uniformly by horizontal multi-action forging die set, and the dimensions are roughly in line with the requirements of the drawing. In the traditional flash forging process, the material has 1435g, and the utilization rate of the material is only 60% to 65%, up more than 35% of waste, and the horizontal multi-action closed forging process just only has 936g, it also improve the utilization of the material to reach more than 95%, even can save the follow-up of machining time.
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