Coupling mechanism and stamping die system

The utility model provides a coupling mechanism contains thread bush, fixed block and cardboard, be provided with the hoop lug on the thread bush outer peripheral face, form locating ring groove between a plurality of hoop lugs, be provided with first U -shaped groove on the fixed block, the tank bottom bread in first U -shaped groove contains first cambered surface, be provided with second U -shaped groove on the cardboard, the tank bottom bread in second U -shaped groove contains the second cambered surface, the crooked diameter of first cambered surface is greater than hoop lug external diameter, the crooked diameter of second cambered surface is greater than the crooked diameter of locating ring groove tank bottom face and is less than hoop lug external diameter, cardboard and fixed block fastening connection, the cardboard with locating ring groove looks block. The utility model also provides a stamping die system that contains above -mentioned coupling mechanism. The utility model provides a coupling me