| 摘要 |
<p>A pipe expanding device according to the present invention comprises a lever unit which provides power to a wedge unit and an inclined punch in opposite directions to each other according to the pressure in a direction to separate the wedge unit and the inclined punch from each other. Thereby, the present invention secures the continuity of a manufacturing method by not requiring an additional separation device, thereby improving work efficiency, preventing damage to pipes, and securing the safety of a worker.</p> |
