Deformation prediction method and system for laser thermoforming of hull skins

Abstract

The invention provides a laser thermoforming deformation prediction method and system for a hull outer plate, including: step 1: establishing a process window about heat source parameters and plate parameters; step 2: performing multiple sets of thermal elastic-plastic finite element based on the process window Simulate and extract the equivalent inherent strain results; Step 3: Establish a predictive neural network model based on the equivalent inherent strain results, and generalize the equivalent inherent strain results under other process parameters in the process window; Step 4: Combine the equivalent inherent strain results It is given to the model in the form of anisotropic thermal expansion coefficient as the initial property of the model; Step 5: By applying a unit temperature load to the model, ensure that the size and direction of the thermal strain distribution obtained by calculation are the same as the equivalent inherent strain distribution; Step 6: The thermoelastic finite element simulation is performed to obtain the deformation displacement of the material. The invention can quickly solve the deformation results of large-sized plate parts and complex paths, and realizes the automatic laser heating forming processing of the hull outer plate.

Description

technical field [0001] The invention relates to the technical field of laser thermoforming processing of hull outer panels, and in particular, to a method and system for predicting laser thermoforming deformation of hull outer panels. Background technique [0002] The hull plate is an important part of the main structure of the ship, and its function is to ensure the watertightness, strength and rigidity of the hull. For a ship, a considerable part of the hull outer plate needs to be surface-processed. At present, the surface forming process of the hull outer plate mainly relies on manual processing, which has become a bottleneck restricting the automation of the shipbuilding industry. Due to the complex modeling and difficult processing of ship curved surface parts, how to realize the automation of the curved surface forming of the hull outer plate is a hot research topic at home and abroad. Although various surface forming methods have been widely used in manufacturing, t...

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Problems solved by technology

[0005] For the laser heating forming of the hull outer plate, the selection of processing parameters is an important part. The effect of processing and forming can be predicted by the thermoelastic finite element model, but it is applied to the calculation of large-size plates and complex processing paths. When processing deformation effects, there are problems such as small application range and slow calculation time

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