Claims
- 1. A method for determining a heating point in the bending of a steel plate, comprising:determining the number of a plurality of congruent isosceles triangles, which are connected together while sharing their equal sides, on the basis of the radius of a curve of a target shape of the steel plate to be bent, the radius of a curve of a measured shape of the steel plate, and a separately set bending angle of the steel plate so that when the curve of the target shape of the steel plate is regarded as an arc, the arc of the target shape of the steel plate can be approximated by a fold line defined by the bases of the plural congruent isosceles triangles and that when the curve of the measured shape of the steel plate is regarded as an arc, the arc of the measured shape of the steel plate can be approximated by a fold line defined by the bases of a plurality of other congruent isosceles triangles which are connected together while sharing their equal sides, the number of the latter isosceles triangles being the same as the number of the former isosceles triangles whose bases constitute the approximating fold line for the target shape; dividing the arc of the measured shape by the number of the isosceles triangles to form respective points on the arc; and using the respective points as heating points.
- 2. A method for determining a heating point in the bending of a steel plate, comprising:dividing a curve of a target shape of the steel plate to be bent, into a plurality of successive segments; similarly dividing a curve of a measured shape of the steel plate into a plurality of successive segments in correspondence with the curve of the target shape; determining the number of a plurality of congruent isosceles triangles, which are connected together while sharing their equal sides, for each segment on the basis of the radius of a division of the curve in each segment of the target shape of the steel plate, the radius of a division of the curve in each segment of the measured shape of the steel plate, and a separately set bending angle of the steel plate so that when the division of the curve in each segment of the target shape of the steel plate is regarded as an arc, the arc in each segment of the target shape of the steel plate can be approximated by a fold line defined by the bases of the plural congruent isosceles triangles and that when the division of the curve in each segment of the measured shape of the steel plate is regarded as an arc, the arc in each segment of the measured shape of the steel plate can be approximated by a fold line defined by the bases of a plurality of other congruent isosceles triangles which are connected together while sharing their equal sides, the number of the latter isosceles triangles being the same as the number of the former isosceles triangles whose bases constitute the approximating fold line for the target shape; dividing the arc of the measured shape in each segment by the number of the isosceles triangles to form respective points on the arc; and using the respective points as heating points.
- 3. A system for determining a heating point in the bending of a steel plate, comprising:a heating point determining unit which reads in target shape data on a target shape of a steel plate to be bent, and steel plate shape measurement data to be obtained by measuring a surface shape of the steel plate; determines the number of a plurality of congruent isosceles triangles, which are connected together while sharing their equal sides, on the basis of the radius of a curve of the target shape of the steel plate, the radius of a curve of the measured shape of the steel plate, and a separately set bending angle of the steel plate so that when the curve of the target shape of the steel plate is regarded as an arc, the arc of the target shape of the steel plate can be approximated by a fold line defined by the bases of the plural congruent isosceles triangles and that when the curve of the measured shape of the steel plate is regarded as an arc, the arc of the measured shape of the steel plate can be approximated by a fold line defined by the bases of a plurality of other congruent isosceles triangles which are connected together while sharing their equal sides, the number of the latter isosceles triangles being the same as the number of the former isosceles triangles whose bases constitute the approximating fold line for the target shape; divides the arc of the measured shape by the number of the isosceles triangles to form respective points on the arc; and calculates the coordinates of the respective points as heating points.
- 4. A system for determining a heating point in the bending of a steel plate, comprising:a heating point determining unit which reads in target shape data on a target shape of a steel plate to be bent, and steel plate shape measurement data to be obtained by measuring a surface shape of the steel plate; divides a curve of the target shape of the steel plate into a plurality of successive segments; similarly divides a curve of the measured shape of the steel plate into a plurality of successive segments in correspondence with the curve of the target shape; determines the number of a plurality of congruent isosceles triangles, which are connected together while sharing their equal sides, for each segment on the basis of the radius of a division of the curve in each segment of the target shape of the steel plate, the radius of a division of the curve in each segment of the measured shape of the steel plate, and a separately set bending angle of the steel plate so that when the division of the curve in each segment of the target shape of the steel plate is regarded as an arc, the arc in each segment of the target shape of the steel plate can be approximated by a fold line defined by the bases of the plural congruent isosceles triangles and that when the division of the curve in each segment of the measured shape of the steel plate is regarded as an arc, the arc in each segment of the measured shape of the steel plate can be approximated by a fold line defined by the bases of a plurality of other congruent isosceles triangles which are connected together while sharing their equal sides, the number of the latter isosceles triangles being the same as the number of the former isosceles triangles whose bases constitute the approximating fold line for the target shape; divides the arc of the measured shape in each segment by the number of the isosceles triangles to form respective points on the arc; and calculates the coordinates of the respective points as heating points.
Priority Claims (4)
Number |
Date |
Country |
Kind |
9-263748 |
Sep 1997 |
JP |
|
9-263751 |
Sep 1997 |
JP |
|
10-261088 |
Sep 1998 |
JP |
|
10-261089 |
Sep 1998 |
JP |
|
Parent Case Info
This application is a divisional of application Ser. No. 09/159,758, filed on Sep. 24, 1998, now U.S. Pat. No. 6,298,310 the entire contents of which are hereby incorporated by reference and for which priority is claimed under 35 U.S.C. §120; and this application claims priority of Application Nos. 9-263748; 9-263751; 10-261088; and 10-261089 filed in Japan on Sep. 29, 1997; Sep. 29, 1997; Sep. 16, 1998; and Sep. 16, 1998 under 35 U.S.C. §119.
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Number |
Name |
Date |
Kind |
4120187 |
Mullen |
Oct 1978 |
A |
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Number |
Date |
Country |
0575646 |
Dec 1993 |
EP |
94021402 |
Sep 1994 |
WO |
95002475 |
Jan 1995 |
WO |
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Entry |
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