Tool-transition-free machining method and clamp for wheel outer rim

A tool-transition-free machining method for an outer rim of a wheel, comprising the following process steps:

• firstly, a primary turning is conducted, then holes are drilled out by a machining center, and finally a secondary turning is conducted,
• wherein the wheel is clamped by a tool-transition-free machining clamp during the process steps of the tool-transition-free machining method, the tool-transition-free machining clamp comprises a rotating chassis, an axial positioning column, a tensioning oil cylinder, a radial positioning ring, an adjusting oil cylinder, guide pins, compression blocks, a tapered extension core, push rods and springs, the axial positioning column is fixed to an center of the rotating chassis, the axial positioning column is internally provided with the tensioning oil cylinder, the tensioning oil cylinder is connected with the radial positioning ring, the adjusting oil cylinder is mounted in the radial positioning ring and connected with the tapered extension core, one end of each push rod is fixed on a respective one of the compression blocks, and the other end is matched with the tapered extension core, the compression blocks are connected with an inner wall of the radial positioning ring through the springs and the guide pins,
• wherein during the primary turning, the outer rim from an inner flange of the wheel to an outer edge of the wheel is roughly turned, and after the outer rim is roughly turned, 0.2-0.3 mm of machining allowance is reserved for fine turning, and
• wherein during the secondary turning, a flange plate on the axial positioning column is in contact with a flange face of a wheel to achieve an axial positioning of the wheel, an outer wall of the radial positioning ring is in contact with a center hole of the wheel to achieve a radial positioning of the wheel, the compression blocks press against an inclined surface on an upper portion of a straight table of the center hole for compressing the wheel, then the outer rim which is not machined during primary turning is roughly turned at first and 0.2-0.3 mm of machining allowance is reserved, finally, whole of the outer rim is finely turned once or twice, so that whole of the outer rim is machined.