Metal deforming – By three or more coacting relatively movable tools – Concurrently actuated tools
Patent
1998-01-22
1999-05-04
Crane, Daniel C.
Metal deforming
By three or more coacting relatively movable tools
Concurrently actuated tools
72 57, 29237, B21D 3904
Patent
active
058991077
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a press tool and a method for connecting a tubular element to an element which is arranged in the interior and substantially adapted to the inner diameter.
Flexible tubes are normally connected by means of a press sleeve to pipes or to specifically shaped connecting pieces with the aid of a multijaw-type press device. So-called press gaps are created between the individual press jaws by this connecting technique.
It has also been known that, for instance for the purpose of achieving a tight connection of flexible tubes or tube bends with fittings or with metal or plastic tubes or pipes, a tubular body is inserted into a tube end and a sheet metal sleeve is slid externally over the tube end and that this member is necked in a press with the aid of a plurality of movable press jaws against the tubular body to compress the tube wall. To ensure sufficient tightness between the outer circumference of the tubular body and the tube wall, there are even two adjacent neckings of circumferentially distributed rows of recesses. Such a connection, however, leads to leakage, especially when there are great temperature variations and strong impacts on the tube connection.
Furthermore, DE-AS 1 675 221 discloses an undetachable pipe connection for metal pipes. The connection is here achieved with the aid of a metallic tubular sleeve which remains at the connecting location after the metal pipes have been connected. The sleeve itself consists of an outer pressure ring and an inner sleeve, with a ring chamber being created between these two members. To interconnect two metal pipes, the sleeve is slid over both pipe ends, and pressure is subsequently supplied through an inlet port into the annular chamber, resulting in a deformation on all sides of the inner sleeve arranged around the metal ends. To achieve a tight connection between the metal tubes, a sealing ring of a synthetic or natural, electrically insulating sealing material is provided and received in an annular groove between the metal pipes to be connected and by the inner sleeve. Both the sealing material or sealing ring and the metal sleeve will remain at the connecting location after the metal pipes have been connected.
Furthermore, it is for instance known from EP-A 134 566 that two pipes are connected by radially deforming the tubular elements to be connected. In the described method, a plurality of radially extending grooves are arranged at the connecting location with the aid of a device in which a plurality of rolls are arranged around the pipes to be connected. Because of its special construction, this device occupies a relatively large space around the members to be connected for ensuring a complete connection.
Furthermore, EP-A 218 049 discloses a seal for tubular elements, wherein a bushing is inserted into a metal pipe for sealing purposes. The seal is here established via a deformable material which is arranged on the outside of the bushing in contact with the inner surface of the tubular element. Whenever a force, such as a pressure, is exerted on the deformable material, the latter will deform radially and will firmly and/or sealingly be pressed against the inner surfaces of the tubular element.
Hence, it has so far not been possible to achieve a tight connection between two metallic pipes or a pipe and any other desired element, such as a flexible tube, without the use of a so-called sleeve or without so-called press gaps being formed between the individual press jaws at the connecting location in the course of the connecting process.
Both the press sleeve and the resultant press gaps are of disadvantage to many applications, since the connection becomes shapeless on the one hand and the pipe is adversely affected by the press gap and the shear effects on the other hand.
Furthermore, the space required for ensuring a completely tight connection around the pipe circumference is often limited, especially at locations that are hardly accessible, so that limits are set to known tools and the connections have partly to b
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Geimer Joachim
Zulch Wilfried
Crane Daniel C.
Veritas Gummiwerke AG
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