| 摘要 |
A radiator tank headsheet including an integral ferrule around an elongated tube-receiving opening and method for forming the same wherein the method includes the steps of forming an elongated depression in the sheet material having generally parallel sidewalls, endwalls joining the sidewalls, and a bottomwall, forming a pair of holes in the depression by removing a slug of sheet material from the bottomwall adjacent each of the endwalls, splitting the bottomwall generally along its centerline between the holes to form two bottomwall segments, and forcing the two segments outwardly and into coplanar relationship with the sidewalls of the depression to form an elongated opening including an integral ferrule having generally parallel, relatively high sidewalls and endwalls of lesser height joining the sidewalls. |
