Staged shearing and forming methods for t-bar cylindrical members

A graded shearing and forming method for a T-bar cylindrical member, comprising:

• S1, mounting a cylindrical blank onto a mandrel of a numerically controlled spinning machine, and assembling a shear spinning wheel, a flow spinning wheel, a fractal spinning wheel, and a flat spinning wheel on a spinning wheel stand of the numerically controlled spinning machine;
• S2, adjusting the shear spinning wheel so that a shearing working surface of the shear spinning wheel contacts a surface of the cylindrical blank, starting the numerically controlled spinning machine, allowing the cylindrical blank to rotate circumferentially under driving of the mandrel, controlling an axial feeding of the shear spinning wheel along the cylindrical blank until a feeding amount of the shear spinning wheel is reached, thus forming an unsaturated I-bar cylindrical member with an unsaturated I-bar structure;
• S3, adjusting the flow spinning wheel so that a working surface of the flow spinning wheel contacts a surface of the unsaturated I-bar cylindrical member perpendicularly, maintaining a rotational state of the cylindrical blank from S2, wherein the flow spinning wheel thins an unthinned side of the unsaturated I-bar cylindrical member to make wall thicknesses on both sides equal, then the flow spinning wheel performs axial extrusion shaping on the unsaturated I-bar structure to obtain a saturated I-bar cylindrical member with a saturated I-bar structure;
• S4, adjusting the fractal spinning wheel so that a fractal working surface of the fractal spinning wheel contacts a top of the saturated I-bar structure, maintaining the rotational state of the cylindrical blank from S2, conducting a radial feed movement of the fractal spinning wheel until a feeding amount of the fractal spinning wheel is reached, thus forming a Y-bar cylindrical member with a Y-bar;
• and
• S5, adjusting the flat spinning wheel so that a working surface of the flat spinning wheel contacts a surface of the Y-bar cylindrical member perpendicularly, maintaining the rotational state of the cylindrical blank from S2, wherein the flat spinning wheel applies radial loading along a top of the Y-bar to reshape the Y-bar cylindrical member into the T-bar cylindrical member.