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Method for calculating heating program in linear heating

A heating program, linear technology, applied in computing, computer-aided design, special data processing applications, etc., can solve the problems of destroying the local accuracy of the curved surface, impossible to greatly improve the local accuracy of the surface, tolerance and other problems

Inactive Publication Date: 2003-05-28
JAPAN MARINE UNITED CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, additional residual stresses are caused around the heating wire, thus compromising the local precision of the curved surface
[0011] Moreover, problems arise in this method including the steps of: dividing the target shape of the surface into fine mesh regions; setting the surface stress of each mesh region; approximately calculating the surface stress of the mesh region and the The second differential between the surface stresses of the area obtains the second extreme finite difference; the simultaneous equations are formed under the assumption that the second order finite difference in the surface stress and the compatibility R between the grid area and its surrounding area are equal ; and the surface stress is obtained according to the three simultaneous equations
However, this additional stress produces residual stress
Accordingly, it is not possible to substantially improve the local accuracy of the obtained surfaces

Method used

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  • Method for calculating heating program in linear heating
  • Method for calculating heating program in linear heating
  • Method for calculating heating program in linear heating

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no. 2 example

[0063] 4 to 9B show a second embodiment of the present invention. In the method of deriving the heating program, the method is similar to the first preferred embodiment illustrated in FIG. 4 . However, the heating lines in the direction of the maximum bending principal stress (y direction), which are arranged in the calculation grid 1, are grouped, each group has two heating lines 21y and 22y arranged in parallel at a certain interval, and Not a plus line 2y. Moreover, by selecting the heating rate Vx of the heating wire 2x in the direction of the minimum bending principal stress (x direction) perpendicular to the direction of the maximum bending principal stress (y direction), the amount of bending deformation generated by the heating rate Vx can realize the target shape of the curved surface maximum bending principal stress. Then, the two heating wires 21y and 22y are heated separately. In this case, the respective heating speeds of the heating wires 21y and 22y are selec...

no. 3 example

[0091] Figure 4 shows a third embodiment of the invention, which is similar to the second embodiment, as demonstrated with reference to Figures 4 to 9B. However, the third preferred embodiment differs from the second preferred embodiment in the following point. In the second preferred embodiment, on the surface of the steel plate 3 as the material, a group of heating wires is arranged, each group has two heating wires 21y and 22y, and is arranged in parallel with a certain interval (refer to Figure 6 ). However, in the third preferred embodiment, the heating wires 21y and 22y constituting one set are respectively provided on the front and rear surfaces of the steel plate 3 next to each other, and are positioned in parallel at intervals in the horizontal direction. FIG. 4 shows a state where the heater wire 21y is arranged on the front surface and the heater wire 22y is arranged on the rear surface.

[0092] When the heating wire 22y provided on the rear surface of the steel...

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Abstract

A distribution of bending principal strains giving a target shape of a curved surface is obtained (Step S1), and a calculation grid is divided along the direction of the bending principal strains (Step S2). A database storing actual measurement values of relations between heating conditions and deformation amounts is prepared (Step S3). The directions of the bending principal strains are divided into the directions of the maximum and minimum bending principal strains (Step S4) for each calculation grid. Then, a heating condition for obtaining a bending strain satisfying the maximum bending principal strain is obtained by a heating line perpendicular to the direction of the maximum bending principal strain, and a membrane strain generated accompanying with heating in this case is obtained by referring to the database (Step S5). Membrane strains generating a deflection of the target shape of a curved surface are calculated in consideration of the distribution of the membrane strains obtained in Step S5, and a heating condition satisfying the membrane strains in the two principal axis directions is obtained (Step S6). Then, a heating procedure is determined (Step S7).

Description

technical field [0001] The present invention relates to a method of deriving a heating program in linear heating, wherein the arrangement of heating lines and heating conditions are determined so as to perform a bending operation, such as in a shipyard, an operation of bending a sheet material into a peripheral curved plate constituting a ship's hull (sheet metal forming operations on target shapes with curved faces). Background technique [0002] In recent years, a bending operation of a metal plate using a linear heating bending operation has been applied to ships and the like. [0003] Linear heating is a technique that utilizes the characteristics of a metal plate, in which a metal plate is linearly heated using a point heat source such as a gas burner to generate elastic tension and deform under the constraints of its periphery. Moreover, linear heating is also an operation technique for forming a metal plate into a target shape of a curved surface by setting heating p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D11/20G06F17/50
CPCG06F2217/80G06F17/5018G06F2119/08G06F30/23B21D11/20
Inventor 石山隆庸小林顺
Owner JAPAN MARINE UNITED CORP