Method for the crosswise shrinking of a cylindrical part in a tubular part, tool kit for its implementation, and assembly of two corresponding parts
AssigneeVallourec Composants Automobiles Vitry
InventorDaniel Valin
Life of this patent
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Abstract
An assembly (10) formed of two parts pressed together in cruciform arrangement comprises a cylindrical part (11) and a tubular part (12). The tubular part (12) has a transverse hole (14) bordered by rims (18) extending toward each other. A spacer (16) in the form of a ring is inserted between the walls (15) of the tubular part (12), surrounding the region where the hole is to be formed. The rims are then deflected toward each other into engagement with the interior of the ring, the ring having a height equal to the distance between the walls (15). Thus, the ring (16) braces the tubular part (12) internally around the hole (14).
Claims9
A tool for pressing a cylindrical part into a tubular part through a hole passing completely through opposite walls of the tubular part, which comprises a first stepped punch adapted to punch a preliminary hole, said first punch having a first section having a free end adapted to punch a preliminary hole in said tube and a second section with a progressive transverse profile adapted to perform coarse pressing and a third section adapted to perform finish pressing, the tool having a second stepped punch adapted to perform successive pressing and sizing, the second stepped punch having a frustoconical first section a cylindrical second section and, alternating with connecting sections of lesser diameter, at least one other cylindrical section having a diameter greater than the diameter of the second cylindrical section for sizing the hole obtained in a plurality of passes.
A cruciform assembly of a cylindrical part and a tubular part produced by the method of inserting a ring (16) into the tubular part, forming rims (18) extending toward each other from the material of opposite walls about a hole and within said ring, the ring having a height substantially equal to the distance between said opposite walls adjacent said hole, and pressing said cylindrical part through said hole.
Dependencies are inferred from the claim text.