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板料弯曲时,断面中性层的圆弧半径R用下式计算有足够的精确度(图1)。 R=r+χs r-弯曲件的内径(毫米); s-板料厚度(毫米); χ——中性层移动系数,为实验数值,其大小与比值r/s和材料的机械性能有关。下表为弯曲角度90°、内径r=0.1～15毫米、板厚S≤3毫米、材料的强度极限δ_b不大于40公斤/毫米～2时所得到的弧长R数值。π值取为3.1416。系数χ数值按资料PTM34-65选取(见原文的参考资料〔1〕——编者)。对于强度极限大于40公斤/毫米～2的材料,系数χ有较小的数值。该表仅适用于宽度大于板厚二倍的零件(条料)。表列弧长适用于比值10>r/s≥0.3的
When the sheet is bent, the radius R of the circular section of the neutral section of the section is calculated with sufficient accuracy (Figure 1). R = r + χs r - inner diameter of the bending member in millimeters; s - thickness of the sheet in millimeters; χ - movement coefficient of the neutral layer as an experimental value, the magnitude of which is related to the ratio r / s and the mechanical properties of the material . The following table for the bending angle of 90 °, the inner diameter r = 0.1 ~ 15 mm, thickness S ≤ 3 mm, the material strength limit δ_b is not greater than 40 kg / mm ~ 2 obtained when the arc length R value. The value of π is taken as 3.1416. The value of the coefficient χ was chosen on the basis of the data PTM 34-65 (see original reference [1] - editor). For materials with strength limits greater than 40 kg / mm 2, the coefficient χ has a smaller value. This table only applies to parts (bars) that are more than twice the width of the board. Table arc length for the ratio of 10> r / s ≥ 0.3