在板材弯曲确定平坯料的长度时,一般采用表格、经验法及试凑法。但是,坯料长度不仅取决于弯曲半径、材料厚度、弯曲角度,而且还取决于所采用的具体材料,因此,以上几种方法所得到的结果往往不能令人满意。较好的方法是用适合于各种材料的一套公式来计算弯曲修正值及弯曲部份长度。如果已知材料的强度及延展性,则可以直接使用公式。如果不知道,则可做一简单的弯曲试验确定材料的性质,以试验所得的数据用公式对该弯曲进行计算。为减少计算工作量,可将各公式编 Bending plate in determining the length of the flat material, the general form, experience and try to make law. However, the length of the blank depends not only on the bending radius, the thickness of the material, the bending angle, but also on the specific material used, so the results obtained by the above methods are often unsatisfactory. It is a good idea to calculate the bend correction and the length of the bend using a set of equations that fit a variety of materials. If you know the strength and ductility of the material, you can use the formula directly. If you do not know, you can do a simple bending test to determine the nature of the material, the test data obtained using the formula to calculate the bending. To reduce the computational workload, the formulas can be compiled