Method and system for bending

A bending method, comprising:

• creating a three-dimensional stereoscopic diagram including a desired bending angle, based on graphic information of a product;
• obtaining a test piece of a material proposed for use in the product;
• bending the test piece based on a preliminary spring back amount and a preliminary elongation amount;
• measuring a bending angle and a flange dimension of the bent test piece after a load is removed and comparing the measured bending angle and the flange dimension with the desired bending angle and a desired flange dimension;
• calculating a stroke value and a back gauge value using a difference between the desired bending angle and flange dimension values and the measured bending angle and flange dimension values;
• bending a product piece based on the calculated stroke value and the back gauge value;
• measuring a bending angle and a flange dimension of the product piece after a load for the bending is removed and determining whether the measured bending angle and the measured flange dimension of the product piece are within tolerances relative to the desired bending angle and the desired flange dimension;
• and
• when it is determined that the measured bending angle and the measured flange dimension are within the tolerances, the bending is terminated;
• and when it is determined that at least one of the measured bending angle and the measured flange dimension are not within the tolerances, a correction stroke value is obtained from a difference between the desired bending angle and the measured bending angle, a correction back gauge value is obtained from a difference between the desired flange dimension and the measured flange dimension, so as to be stored in a data base, and corrective bending is carried out according to the correction stroke value and the correction back gauge value.

A bending system for manufacturing a product by bending a sheet material using a bending machine, comprising:

• a three-dimensional stereoscopic diagram creator that creates a three-dimensional stereoscopic diagram including a desired bending angle based on graphic information of the product;
• a test piece displayer that displays a test piece of a material proposed for use in the product;
• a bending angle measuring device for measuring bending angles of the test piece bent by the bending machine, and for measuring angles of the product bent by the bending machine;
• a spring back amount determiner that determines a spring back amount for the test piece;
• and
• a stroke calculator that calculates a stroke value corresponding to the desired bending angle for the product considering the spring back amount obtained by the spring back amount determiner.

A bending method, comprising:

• bending a test piece by applying a load, measuring bending angles before and after a load removal, and measuring an elongation amount of flange width due to the bending;
• calculating a spring back amount of the test piece from the measured bending angles of the test piece before and after the load is removed, obtaining a stroke value from the calculated spring back amount of the test piece, and obtaining a back gauge value from the measured elongation amount of flange width of the test piece;
• bending a product piece based on the calculated stroke value and the back gauge value,
• measuring a bending angle and a flange width of the product piece after a load removal, and determining whether the measured bending angle and the measured flange width of the product piece are within predetermined tolerances;
• and
• terminating the bending when the measured bending angle and the measured flange width of the product piece are within the tolerances;
• and when the measured bending angle and the measured flange width of the product piece are not within the tolerances, obtaining a correction stroke value and a correction back gauge value, and performing corrective bending according to the correction values.

A bending method, comprising:

• bending a test piece based on a preliminary spring back amount and a preliminary flange elongation amount, by applying a load, and measuring a bending angle and a flange dimension of the bent test piece after the load is removed;
• calculating a stroke value and a back gauge value using a difference between a desired bending angle and the measured bending angle, and a difference between a desired flange dimension and the measured flange dimension;
• bending a product piece based on the calculated stroke value and the back gauge value, measuring a bending angle and a flange dimension of the bent product piece after a load is removed, determining whether the measured bending angle and the measured flange dimension are within predetermined tolerances;
• and
• terminating the bending when the measured bending angle and the measured flange dimension of the product piece are within the tolerances;
• and when the measured bending angle and the measured flange dimension of the produce piece are not within the tolerances, obtaining a correction stroke value and a correction back gauge value, and performing corrective bending according to the correction values.

A bending system for manufacturing a product by bending a sheet material using a bending machine, comprising:

• a bending angle measuring device that measures bending angles of a test piece before and after the test piece is bent by the bending machine;
• a spring back amount determiner that determines a spring back amount for the bent test piece;
• and
• a stroke calculator that calculates a stroke value corresponding to a desired bending angle for a product piece based on the spring back amount obtained by the spring back amount determiner for the test piece.