US 6,560,498 B1 · Formation method and device for curved plates

Abstract

This invention includes the generation of forming information and its manipulation scheme as a method to form curved plates in ship hull-pieces. This invention consists of three components as follows: one is to construct and utilize a database which includes data about flat plates, objective curved plates, plates which are being formed, and their forming information, another is to infer new forming information with an artificial neural network system, and the third is to obtain forming information through calculating in-plane and bending strains. In the third, initial forming information is obtained by calculating strains from relationship between flat plates and objective curved plates. And new forming information is yielded through calculating the strains from relationship between partially formed curved plates and objective curved plates. Final objective plate are reached by repeatedly performing the measurement of the difference between plates in the proceeding steps and final objective plates and the calculation of the new strains in each process. Therefore, through this invention standardization and automation can be realized in the formation of curved plates.

Claims8

Dependent claims

A ship hull-piece forming method comprising:

(a) constructing a product database by using a relational database management system and by building a product model on a basis of information modeling about formation data;
(b) measuring the shape of a plate and process information;
(c) performing numerical analyses on a basis of thermal elastic-plastic theory, which have forming information on the measured plate and information on heating position as an off-line training or programming;
(d) inferring forming information to be applied to the plate obtained through an artificial neural network based on data obtained by numerical simulations and measured from previous works;
and
(e) generating information on heating paths and heat conditions by calculating in-plane and bending strains from the relationship between the plate and an objective curved plate and from the relationship between the objective curved plate and the plate partially formed in the middle of formation;
wherein the difference between any shaped plate partially formed in the middle of formation and the objective curved plate is measured during the process, and the in-plane and bending strains are numerically calculated based on that difference to provide the forming information;
and
wherein formation is completed by repeatedly making measurement and calculation at each processing step.

6 more elements

An information-generation system for ship hull-piece formation comprising:

a measurement module in which a shape of a plate and forming information is measured;
a numerical analysis module in which heating conditions are calculated and verified, using a numerical analysis program for thermal elastic-plastic analysis;
a display module in which forming information is displayed, via a monitor, and is printed, via a printer;
a data access module in which measuring and forming information is stored to and retrieved from a product database and a STEP physical file that has measuring and forming information is available;
an inference module in which forming information and heating conditions regarding the plate are predicted from data of the product database by using an artificial neural network method;
an information-generating and control module in which each module previously described is controlled and is obtained through calculation of in-plane and bending strains in the processing stages, wherein heating paths or locations are determined;
a communication module through which the information-generating and control module transmits forming information, heating conditions and heating paths to a numerical control machine through which the measured and formation results are transmitted and stored to the product database.

4 more elements

Dependencies are inferred from the claim text.

Formation method and device for curved plates

Life of this patent

Formation method and device for curved plates

Life of this patent

Abstract

Claims8