Round-head combined hole forming machine

Disclosed is a round-head combined hole forming machine. A second motor is arranged on the upper portion of a left rotary box, a first oblate circle is mounted at the front end of the second motor, a third oblate circle is mounted at the rear end of the second motor, a first short shaft is eccentrically fixed on the first oblate circle, and a third short shaft is eccentrically fixed on the third oblate circle. The first short shaft is hinged to the upper end of a first driven rod, the lower end of the first driven rod is hinged to a round-head combination barrel, the third short shaft is hinged to the upper end of a third driven rod, and the lower end of the third driven rod is hinged to the round-head combination barrel. A third motor is arranged on the upper portion of a right rotary box, a second oblate circle is mounted at the front end of the third motor, a fourth oblate circle is mounted at the rear end of the third motor, a second short shaft is eccentrically fixed on the second oblate circle, and a fourth short shaft is fixed on the fourth oblate circle eccentrically; the second short shaft is hinged to the upper end of the second driven rod, the lower end of the second driven rod is hinged to the round-head combination barrel, the fourth short shaft is hinged to the upper end of a fourth driven rod, and the lower end of the fourth driven rod is hinged to the round-head combination barrel. The round-head combination barrel is provided with an elongate thin-shell barrel having a certain height and the section with two semicircular ends and the round middle.