A Water-fire Bending Evaluation Method Based on Surface Vector Slope Difference Ratio

Abstract

The invention discloses a line heating forming evaluation method based on a surface vector gradient difference ratio. The method is mainly applied to the overall bending forming process for a ship hull plate based on a line heating technology in the shipbuilding industry. The method mainly comprises the following steps: (1) randomly selecting points on a forming plate and finding points corresponding to the points on a standard plate; (2) working out the vector gradients of the points on the forming plate and the corresponding points on the standard plate respectively; (3) calculating the vector gradient difference ratio of the randomly selected points and the corresponding points on the standard plate, and if the vector gradient difference ratio is smaller than 10%, successfully matching the points on the forming plate with the corresponding points on the standard plate; (4) calculating the proportion of the successfully matched points on the forming plate in all points to finish the forming evaluation. According to the method, starting with vector gradients of points on a curved surface, the D-values of the vector gradients of the points on the curved surface and the corresponding points on the standard plate are compared, so that the line heating forming effect can be effectively judged and evaluated.

Description

technical field [0001] The present invention relates to the technical field of forming evaluation of large and complex hull plates, in particular to a water-fire bending plate forming evaluation method based on the slope difference ratio of the outer surface vector, which is mainly used in the shipbuilding industry for forming the curved surface of the hull plate based on the curvature difference ratio testing and evaluation. Background technique [0002] Water and fire bending, also known as line heating or line heat of forming, is a forming process that uses local thermoelastoplastic deformation of the metal plate after local heating and cooling to achieve overall bending. The water-fire bending process method originated in Japan in the 1950s and 1960s. Due to the advantages of fast processing, flexible operation, no need for other equipment, and suitable for forming complex shapes, it has been rapidly and widely used in shipyards around the world. It has become the main ...

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Problems solved by technology

[0004] The present invention proposes a water-fire bending plate forming evaluation method based on the surface vector slope difference ratio, through which the forming effect of water-fire bending plate can be judged and evaluated, and the problem that it is difficult to judge the forming effect of bending plate firing is solved

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