Skeleton die

The utility model relates to a skeleton die which comprises an upper half die and a lower half die. Skeleton product shape dies which are fit with each other are respectively arranged in the center of the upper half die and the center of the lower half die. The main body of each shape die is of the shape of a circle (4). Arc-shaped raised parts (3) are annularly arranged at the internal part of the circle (4) of the upper half shape die. Square downward concave parts (2) are annularly arranged at the external part of the circle (4) of the upper half shape die. Square raised parts (6) are arranged at the corresponding positions of the lower half shape die. Fine grooves (7) are arranged around the center in the internal part of the circle (4). Column holes (1) are arranged at the four corners of the upper half die and stand columns (5) are arranged at the four corners of the corresponding lower half die. The utility model can solve the problem of unreasonable structural design of the skeleton die in the prior a