Perforated hole size adjustable melodica fine blanking device

The utility model discloses a melodica fine blanking device with adjustable punching size, which comprises an upper die holder, a lower die holder and a guide sleeve, a punch die is arranged in the middle of the lower surface of the upper die holder, a U-shaped groove is arranged in the middle of the lower die holder, two groups of female dies are attached to two ends in the groove along the length direction, and the guide sleeve is sleeved on the lower surface of the upper die holder. Two sets of vertical dies are arranged between the two sets of female dies in an attached mode, the guide sleeve perpendicularly penetrates through the upper die base and the lower die base, a punching hole site is formed between the two sets of female dies, and the center point of the punching hole site and the center point of the punching die are located on the same perpendicular line. The fine blanking device solves the technical problem that a common fine blanking device can machine to-be-machined parts of different sizes o