Double layer step type ten-cut external reinforcement plate manufacturing method

The invention relates to the technical field of manufacturing of external reinforcement plates for stainless steel vehicle bodies, in particular to a double layer step type ten-cut external reinforcement plate manufacturing method. The double layer step type ten-cut external reinforcement plate manufacturing method comprises the steps that a retaining ruler of a bending machine is replaced with astep-type double-layer retaining ruler, and according to the ten-cut bending sequence of L1, L10, L7, L6, L9, L8, L4, L5, L2 and L3 of a bending line, external reinforcement plate material parts are bent. The step-type double-layer retaining ruler is adopted, materials can be overlapped on steps of the step-type double-layer retaining ruler, certain specific material parts can be simultaneously machined, and thus the productivity is increased; through the specific ten-cut bending sequence, size out-of-tolerance, generated by ten-cut bending accumulation, of material part tolerance can be avoided, and meanwhile the fla