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A method for generating a three-dimensional sheet-metal model utilizing a feature for generating a general solid model without a sheet-metal attribution is provided. The method includes the steps of estimating a thickness of a sheet-metal from a cross section designated by a user, representing a ben

A method for generating a three-dimensional sheet-metal model utilizing a feature for generating a general solid model without a sheet-metal attribution is provided. The method includes the steps of estimating a thickness of a sheet-metal from a cross section designated by a user, representing a bent portion of the sheet-metal by rotating a cross section designated by the user around a set axis in accordance with a bending direction designated by the user and by sweeping the rotated cross section by a length designated by the user, representing an abutting portion by sweeping a cross section designated by the user by a length designated by the user, and realizing sheet division by a sweep slit that is formed by sweeping a tiny cross section including a division line designated by the user on a plane designated by the user.

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1. A method for generating a three-dimensional sheet-metal model on a computer screen using a CAD for generating a solid model by a general feature without a sheet-metal attribution, the method comprising the steps of:(a) estimating a thickness of a sheet-metal from a cross section designated by a u

1. A method for generating a three-dimensional sheet-metal model on a computer screen using a CAD for generating a solid model by a general feature without a sheet-metal attribution, the method comprising the steps of:(a) estimating a thickness of a sheet-metal from a cross section designated by a user; (b) representing a bent portion of the sheet-metal by rotating a cross section designated by the user around a set axis in accordance with a bending direction designated by the user and by sweeping the rotated cross section by a length designated by the user; (c) representing an abutting portion by sweeping a cross section designated by the user by a length designated by the user; and (d) realizing sheet division by a sweep slit that is formed by sweeping a tiny cross section including a division line designated by the user on a plane designated by the user. 2. A method according to claim 1, wherein the step (a) for estimating a thickness of a sheet-metal includes the substeps of searching an edge that is closest to a point designated by the user for designating the cross section, searching an edge that is opposed to the edge in parallel, and estimating a distance between the two searched edges as the thickness of the sheet-metal.3. A method according to claim 1, wherein if the cross section designated by the user includes a curve edge in the step (b) for representing a bent portion of the sheet-metal, the step (b) includes the substep of determining a cross section for bending that is a rectangular cross section area including a point designated by the user for designating the cross section except for the curve edge area.4. A method according to claim 1, wherein if the cross section designated by the user includes a curve edge in the step (c) for representing an abutting portion, the step (c) includes the substep of determining a cross section to be swept that is selected from a group of (i) a rectangular cross section area including a point designated by the user for designating the cross section except for the curve edge area, (ii) the rectangular cross section area plus the curve edge area and (iii) the entire area of cross section designated by the user.5. A computer program that is installed in and executed by a computer as a CAD program for generating a three-dimensional sheet-metal model on a computer screen, the program cooperating with a CAD program for generating a solid model by a general feature without a sheet-metal attribution and making the computer execute the process including the steps of:(a) estimating a thickness of a sheet-metal from a cross section designated by a user; (b) representing a bent portion of the sheet-metal by rotating a cross section designated by the user around a set axis in accordance with a bending direction designated by the user and by sweeping the rotated cross section by a length designated by the user; (c) representing an abutting portion by sweeping a cross section designated by the user by a length designated by the user; and (d) realizing sheet division by a sweep slit that is formed by sweeping a tiny cross section including a division line designated by the user on a plane designated by the user. 6. A computer program according to claim 5, wherein the step (a) for estimating a thickness of a sheet-metal includes the substeps of searching an edge that is closest to a point designated by the user for designating the cross section, searching an edge that is opposed to the edge in parallel, and estimating a distance between the two searched edges as the thickness of the sheet-metal.7. A computer program according to claim 5, wherein if the cross section designated by the user includes a curve edge in the step (b) for representing a bent portion of the sheet-metal, the step (b) includes the substep of determining a cross section for bending that is a rectangular cross section area including a point designated by the user for designating the cross section except for the curve edge area.8. A computer program according to claim 5, wherein if the cross section designated by the user includes a curve edge in the step (c) for representing an abutting portion, the step (c) includes the substep of determining a cross section to be swept that is selected from a group of (i) a rectangular cross section area including a point designated by the user for designating the cross section except for the curve edge area, (ii) the rectangular cross section area plus the curve edge area and (iii) the entire area of cross section designated by the user.9. A recording medium than can be read by a computer and stores a program recited in claim 5 for generating a three-dimensional sheet-metal model on a computer screen using a CAD for generating a solid model by a general feature without a sheet-metal attribution.