HTML5 Webook

226/248

ill/lB68R12456789 sepmaxEnoitacppAataDilsepmaxEnoitacppAataDTable of Standard Bending Loads (Unit: kN) Simplified Chart of Bending Loads Corresponding to Thickness and LengthsSoft brassSoft aluminumAluminum alloyStainless steelChromium molybdenum steelBending equationPlate thickness t (mm)2.32.63.24.02752262841772263431471862754221181572263531081271963048811817726578108157235699813721688127196118177167157Work piece: SS400(tensile strength: 400 N/mm2)Data0.60.849781.53959101.629491339162.5203.225303540457.55055 (Standard width of the lower die)60106510.5701175128013Example: The load required to bend an steel plate 3.2 mm 8514901595161001711018120201.01.21.41.62.0108881271676913717798591081371967849108177598839496988137395969108495988497869thick and 3 m long can be obtained as follows. The standard width B is approx. 8t ≈ 25. The table indicates the corresponding necessary load per meter as 275 kN. Accordingly, the total necessary load is 825 kN (275 kN × 3 m).In this case, the internal diameter R of the bent sheet is 4 mm or larger.When the t-axis (mm) and the L-axis (m) represent plate thicknesses and lengths respectively, if two points on the t-axis and the L-axis are connected with a line, the point of the intersection on the central axis represents the load kN.The chart shows that the width of the standard bending die is eight times the plate thickness, and that a mild steel of 370 to 410 N/mm2 is bent to 90°.E.g.:When the plate is 1.2 mm thick and 2 m long4.56.07.08.09.0539451794382686333598814304530726941275480647843245431588775971226402539706892206373500647824196343461608765186324431569716167304412530667284382500628363471598451569539F = Load (kN)t = Sheet length (mm)L = Bending length (mm)fs = Tensile strength (N/mm2)B = Lower die width(mm)R = Tip of upper die(mm)10.012.014.016.0107998114719411373185388312751726824117716182118775111815201991735105914421883696100013631785667951129416875988631177154079410791412Bending load: kN/m12111050 %50 %100 %170 %200 %No.79E since2025225 = B ≈ 8 t