The ornamental design for a double cuttingdie, as shown and described.
FIG. 1 is a perspective view of a double cutting die, showing my new design;
FIG. 2 is a top plan view of FIG. 1;
FIG. 3 is a bottom plan view of FIG. 1;
FIG. 4 is an enlarged left-side elevation view of FIG. 1, the right-side elevation view being a mirror image thereof; and,
FIG. 5 is an enlarged cross-sectional view taken along line 5-5 of FIG. 2.
The dot-dash broken lines represent a boundary of the claimed design. The remaining broken lines depict portions of the double cutting die that form no part of the claimed design.