In the present invention, the operator is safely in a state in which the underheating mold 30 is advanced by the forward movement of the horizontal piston 22, that is, in the state that the underheating mold 30 is separated from the upper heating mold 50 to the front after being lowered. The synthetic resin foam bundle (M) can be inserted, and further, the underheating mold (30) is retracted so that the horizontal piston (22) moves safely away from the operator, and then the center piston (12) is moved upward to the underheating mold ( 30) to be combined with the upper heating mold 50 to form a surface fusion layer (P) along the all-around surface of the synthetic resin foam bundle (M), and then the upper heating mold (50) by a downward motion of the center piston (12). ) From the underheating mold (30), and the underheating mold (30) is moved forward by the forward movement of the horizontal piston (22), that is, after the underheating mold (30) is lowered from the upper heating mold (50). By removing the shape of the buoy (B) in a state that is separated from the front and allowing a new synthetic resin foam bundle (M) to be inserted, the buoy (B) with a uniform surface fusion layer (P) is stabilized while maximizing the stability of the operator. It is an invention related to a buoy manufacturing device that can be quickly mass-produced.
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