Method and system for predicting laser thermoforming deformation of hull plate

Abstract

The invention provides a method and a system for predicting laser thermal forming deformation of a hull plate. The method comprises the following steps: step 1, establishing a process window about heat source parameters and plate parameters; 2, performing multi-group thermal elastic-plastic finite element simulation based on a process window, and extracting an equivalent inherent strain result; 3, establishing a prediction neural network model based on the equivalent inherent strain result, and generalizing the equivalent inherent strain result under other process parameters in the process window; 4, endowing the equivalent inherent strain result to the model in the form of an anisotropic thermal expansion coefficient, and taking the equivalent inherent strain result as an initial attribute of the model; 5, by applying unit temperature load to the model, guaranteeing that the size and direction of thermal strain distribution obtained through calculation are the same as those of equivalent inherent strain distribution; and 6, performing thermoelastic finite element simulation to obtain deformation displacement of the material. By means of the method and system, deformation results of large-size plates and complex paths can be rapidly solved, and full-automatic laser heating forming machining of ship hull plates is achieved.

Description

technical field [0001] The invention relates to the technical field of laser thermoforming processing of hull outer plates, in particular to a laser thermoforming deformation prediction method and system for hull outer plates. 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 plate needs to be curved. At present, the curved surface of the hull plate mainly relies on manual processing. This process has become a bottleneck restricting the automation of the shipbuilding industry. Due to the complex shape and difficult processing of ship curved surface parts, how to realize the automation of hull shell surface forming is a hot research topic at home and abroad. Although various curved surface forming methods have been widely used in processing and manufacturing, due to the characteristics of small bat...

AI Technical Summary

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

Images