| 摘要 |
PROBLEM TO BE SOLVED: To efficiently improve bending accuracy by specifying a measurable factor with little dispersion, controlling a spring back quantity, and adjusting a bending moment according to a measured value, in the bend-working of an extruded shape using a movable bending die whose bending radius or bending angle can be adjusted according to a moving amount. SOLUTION: A working condition compensating a spring back quantity is determined by measuring the hardness of an object to be worked at the time of bend-working and converting obtained hardness into a yield strength value. For instance, the ratio of the theoretical moving amount and the actual moving amount of a movable bending die is set to a correction factor. This correction factor is expressed by the functional formula of the Young's modulus, the section modulus, the yield strength value and the bending radius of the object to be worked. A constant in the functional formula is previously determined by an experiment, etc. At the time of bend-working, the hardness of the object to be worked is measured, and obtained hardness is converted into the yield strength value. A correction factor is found by substituting the yield strength value for the functional formula with a necessary bending radius. Bend- working is performed by determining the actual moving amount of the movable bending die. This method is suitably applied to an A6063 material as well.
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