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Guo Yuqin
College of Mechanical Engineering,
Xi’an Jiaotong University,
Xi’an 710049, China
Li Fuzhu
Technology Institute,
Xuzhou Normal University,
Xuzhou 221011, China
Jiang Hong
Wang Xiaochun
College of Mechanical Engineering,
Xi’an Jiaotong
University,
Xi’an 710049, China |
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DIAGONAL POINT
BY POINT SURFACE
DEVELOPMENT METHOD BASED ON NURBS
SURFACE FOR BLANK SHAPE
ESTIMATION OF
COVER PANEL
Abstract:
According to the characteristics of a complex cover panel, its geometry shape is described by the NURBS surface with great description capability. With the reference to the surface classification determined by Gauss curvature, the proportion of the mid-surface area between before and after being developed is derived from the displacement variation of the mid-surface in the normal vector direction of the sheet metal during the sheet metal forming process. Hereby, based on the curve development theory in differential geometry, a novel diagonal point by point surface development method is put forward to estimate a complex cover panel’s blank contour efficiently. By comparing the sample’s development result of diagonal point by point surface development method with that of available one-step method, the validity of the proposed surface development method is verified.
Key words:
NURBS Cover panel Surface development Blank shape estimation Differential geometry
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