| 摘要 |
PURPOSE:To prevent an artificial miss and to perform bending with high efficiency by storing characteristics of a steel plate in an automatic control mechanism, and deciding the rolling direction of the steel plate and calculating a proper initial bending angle and a next bending angle. CONSTITUTION:This method consists of a steel plate presser 25, a holding leaf 21 which bends the steel plate 11, an encoder 23 as a means which detects its angle of rotation, and a sensor 22 which detects the gap when the holding leaf 21 leaves the steel material 11. Further, an automatic controller 24 which calculates and records the deflection quantity and spring-back quantity of the steel material 11 by being supplied with output signals of both detecting means is provided and characteristic values of elastic deformation and plastic deformation of the steel material 11 are recorded. Then, characteristic values of elastic deformation and plastic deformation when an unworked plate type member is bent for the 1st time are compared with the recorded characteristic values the decide on the relation between the direction of bending and the rolling direction, and the angle of rotation of the holding leaf in next bending by which plastic deformation is obtained almost to a target angle of bending is calculated.
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