Bottom die clamp device for automatic polish-grinding machine of metallographic specimen

The invention discloses a bottom die clamp device for an automatic polish-grinding machine of a metallographic specimen, comprising a bottom die, connecting mechanisms and a clamp mechanism. The connecting mechanisms each comprise a boss and a positioning pin, the boss is of a stair-stepping cylindrical boss which comprises a big cylindrical boss and a small cylindrical boss, the bottom die is of a round bottom die, a bottom surface of the bottom die is provided with a mounting groove which is of a stair-stepping groove, the mounting groove comprises a first groove and a second groove communicated with the first groove, the clamp mechanism comprises a first adjustment block and a fixing piece, the first adjustment block is of a wedge block, and the width of the first adjustment block increases gradually from top to bottom. The bottom die clamp device is reasonable in design, simple and convenient in operation, strong in adaptability and good in positioning effect, can improve the polish-grinding quality of th