The invention discloses a
hobbing clamp for clamping a plurality of parts with big gear rings. The
hobbing clamp for clamping the parts with the big gear rings comprises a pressing portion and a centering portion, wherein the centering portion comprises a base, a first spring, a locating sleeve, force transmission blocks, a lower pull rod and the like, a support is arranged on the top surface of the base, the support is sleeved with a supporting disk, the pressing portion comprises an upper pull rod and a press plate, the upper pull rod is sleeve with a disk spring and a pressing sleeve in sequence from top to bottom, the disk spring and the pressing sleeve are sleeved with a
bushing in a spaced mode, a supporting plate is arranged at the bottom of the press plate, the top surface of the supporting plate is a big-end-down
conical surface, the
conical surface is attached to the bottom surface of the press plate, the lower end of the supporting plate is fixedly sleeved with a gland, the lower end of the upper pull rod is provided with a T-shaped portion, and the T-shaped portion penetrates through a small-
diameter section of a center hole of a taper sleeve and a center hole of a reset spring, and then is clamped into a large-
diameter section of a cylindrical hole formed by inner surfaces of all the force transmission blocks. According to the
hobbing clamp for clamping the parts with the big gear rings, centering of workpieces with big gear rings can be well carried out through expansion blocks, the workpieces can be tightly pressed at the same time, and centering accuracy can be ensured.