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標題: 加載軸向力對小彎徑金屬管迴轉彎曲製程研究
On Draw Bending Process of a Metal Tube in Small Bend Radius with Axial Load
作者: 謝武燈
Hsieh, Wu-Teng
關鍵字: Draw-Bending;迴轉彎曲法;Metal Tube;Metal Tube in Small Bend Radius;Axial Force;金屬彎管;小彎徑彎管;軸向力
出版社: 機械工程學系

Nowadays, becoming lighter and smaller is an important direction for product design. Metal tubes which are broadly used to transport the materials and energy should therefore diminish their application volume without any weakening their function and losing the safety. For this reason metal tubes bent into small radius becomes more and more significant. However, in processing metal tubes into small bend radius, some defects will exist, such as hollows on them or thinning on their outer walls. These defects might lose the function of metal tubes. Thus this research attempts to modify the draw bending process which is mostly applied in the industry to bend the metal tube into small radius, so that the defects might be eliminated. A test platform with a stroke controllable mandrel and a mechanism pushing metal tube in the axial direction was setup. The mandrel positioning, axial loading, and bending speed as well as lubricant status are therefore investigated experimentally in this research.
The experiment results show that there is no significant difference found between various bending speeds. Regarding lubrication on the tube inner wall, a stick slip phenomenon can be found during tube bending, if no lubricant is applied. By positioning the mandrel firstly deeper beyond the bend center and then moving back during the bending process to its normal position, the hollowing on the tube can be reduced. However, if the mandrel moves deeper during the bending process from its normal position, the wall thickness can be conversely thinned. An axial loading imposed on the tube bending process can reduce the flattening of the bent tube. Superposing an axial loading on the tube bent with a mandrel can induce an excellent cross-section of the bent metal tube. The results obtained in this research regarding the mandrel positioning and the imposed axial loading can be offered for tube bending application industry to improve the tube bending process particularly into small bend radius.
Appears in Collections:機械工程學系所

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