Unfolding method of double-curvature plate

A technology of hyperbolic and curved plates, applied in the field of expansion of hyperbolic plates, can solve the problems of shrinkage of hull plate and difference in expansion area, and achieve the effects of improving efficiency, uniform deformation and good precision

Active Publication Date: 2019-11-19
WUHAN UNIV OF TECH
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Problems solved by technology

2. The sheet metal parts are formed by stamping process, which will cause the extension of the plate during the processing; while the hull plate adopts the water and fire bending process, the processing process will cause the shrinkage of the hull plate
Therefore, there is a large difference in the developed area between the two

Method used

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  • Unfolding method of double-curvature plate

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specific Embodiment approach

[0035] An unfolding method for a double-curvature plate. On the basis of considering the thickness of the plate and the forming method of the curved plate, a finite element discretization method is used to discretize the curved plate, and then splicing is carried out after approximately unfolding. The specific implementation of the unfolding method is as follows:

[0036] Such as figure 1 Shown is a flow chart of a method for unfolding a hyperbolic slab. The specific expansion steps are as follows

[0037] 1. Surface fitting: through a series of three-dimensional space points of a given hyperbolic plate, it is fitted into a curved B-spline surface, which can realize the interpolation of any point on the surface and the calculation of the curvature. The B-spline surface S(u,v) of order k×l can be expressed as:

[0038]

[0039] In the formula,

[0040] {d i,j}(i=0,1,...,m; j=0,1,...,n) is an array of control vertices in a given space (m+1)(n+1), N i,k (u)(i=0,1,...,m) ...

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Abstract

According to the unfolding method of a double-curvature plate, a geometric unfolding method is adopted. In the unfolding process, the influence of the plate thickness on the unfolding result is eliminated through deviation of a theoretical surface; meanwhile, a finite element discretization method is adopted, the bent plate is divided into a plurality of battens along a base line, then the battensare divided into small triangular bent plates, the bent plate is approximately replaced by a flat plate, and the battens are unfolded; and finally, different forming machining methods of the hyperbolic plate are considered, the battens are spliced in different modes, and the unfolding outline of the hyperbolic plate is formed. The hyperbolic plate unfolding method better reflects the actual deformation situation in the hyperbolic plate forming process, so that the unfolding result precision is high, and meanwhile the method can be suitable for unfolding of single curvature and thin plates.

Description

technical field [0001] The invention belongs to the field of machinery manufacturing such as shipbuilding, aircraft manufacturing and automobile manufacturing. In particular, it relates to a method for unfolding a hyperbolic plate. Background technique [0002] Double curvature plates are widely used in shipbuilding, aerospace, automobile, high-speed rail, construction and other industries, and generally require straight plates to be processed and formed. [0003] Unfolding refers to the process of flattening a part from a three-dimensional surface to a two-dimensional plane, and is mainly used for blanking and cutting of parts. In the process of shipbuilding, due to the existence of a large number of hull plating with complex curvature, unfolding is also particularly important. However, due to the complex curvature of the outer plate, most of them are processed by water and fire bending, which will lead to shrinkage and deformation of the outer plate during the processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06T3/00
CPCG06T3/0031
Inventor 胡勇黄朝炎陈兴怖
Owner WUHAN UNIV OF TECH
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