Ship Hull Plate Surface Thermoforming Process Automation Key Technology Research

Heat stress is a process sheet metal forming important molding method. Currentlyhigh-strength steel has been widely used in ship production but not yet a maturehigh-strength steel thermal stress molding technology. No mature technology can not do alarge amount of steel processing tasks, this technology has become the bottleneck of theentire shipbuilding process. Therefore, automating key technology research based on shiphull plate forming surface has a very realistic thermal engineering background andsignificance.This article is in such an engineering background, a study of high-frequency inductionbending forming. Forming a high-frequency induction thermal stress is locally rapidlyheated to a high temperature and then rapid cooling process. The dramatic changes intemperature throughout the plate with time and space, the physical properties of the materialparameters are also dramatic changes with temperature. Therefore, the analysis of highfrequency induction temperature field is a typical nonlinear transient heat conductionproblems. Because the high-frequency induction temperature distribution is uneven, in theprocess of induction heating and cooling will produce considerable stress and deformation.High frequency induction stress and deformation of computing nonlinear problems bothlarge strain, large deformation nonlinear problems have materials such as plasticdeformation. To carry out secondary issues, on the basis of previous research results,through theoretical analysis and numerical simulation of finite element method ofcombining simulate a high frequency induction bending forming process.The main contents of this paper include:(1) material properties with temperaturechanges in the calculation process, which belongs to the material non-linear problems, thispaper presents a study of the physical properties of high strength steels based Jmatpro ofheat.(2) No.45on the basis of bent steel plate forming the finite element model, combinedwith thermo-physical properties of the parameter number AH32steel, has been applied toNo. AH32steel magneto-thermal-structural finite element model of multi-field couplingand validate its model effectiveness.(3) the establishment of a magneto-thermal-structural finite element multi-field coupling prediction model, and in the context of a givendifferent process parameters (heating time, thickness, current intensity, frequency, size,cooling mode), using the finite element model No. AH32steel bending deformation prediction results, the results of the real production process have some guidance value.(4)In surface measurement techniques, the researchers measured the point of generatingadaptive triangular mesh model algorithm, the measurement path optimization problem for areasonable description, and the three-dimensional sphere radius compensation algorithmsare explored. Finally, the corresponding theoretical methods, matlab based on the discretepoints obtained by fitting the corresponding reverse bending surface model.Through research and numerical example, the paper established a viabletwo-dimensional temperature field of high frequency induction bending, stress simulationanalysis method for forming the structure of the complex thermal stress analysis oftwo-dimensional temperature field of high frequency induction bending stress providestheoretical basis and guidance to promote the application of finite element analysistechnology thermal stress analysis and engineering molding.