Preparation method of high-efficiency and low-cost ribbed integral plate blank

The invention relates to the technical field of aerospace manufacturing, in particular to a preparation method of an efficient and low-cost ribbed integral slab. Comprising the following steps: S1, determining section shapes and sizes of a skin and a stringer according to a digital model of an integral ribbed slab; s2, calculating the position of a section neutral layer according to the section size of the integral ribbed slab; s3, analyzing the subsequent forming shape of the integral ribbed slab to determine a compressed area in the section; s4, shifting from the neutral layer to the compressed area, and re-determining the section shapes and sizes of the skin and the stringer; and S5, the new skin structure and the new stringer structure are in butt joint, and a welding procedure is implemented to prepare the ribbed integral plate blank. The welding seam is arranged at the position far away from the skin, it is ensured that welding defects can be effectively repaired while the material utilization rate is s