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Cone with Longitudinal Groove

IP.com Disclosure Number: IPCOM000237678D
Publication Date: 2014-Jul-02
Document File: 2 page(s) / 134K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention basically is about a small modification of a conventional expansion cone i.e. a longitudinal groove or kind of recess in order to allow for expansion of longitudinally welded tubes having a weld bead at the inner diameter. Without such recess high local contact stresses - leading to accelerated wear or damage to the surfaces and material of cone and tube - as well as out-of-roundness after expansion must be expected. The idea seems to be particularly suitable for expansion of long (eventually coiled) folded tubes. In expansion technology usually (short, threaded) seamless tubes are used for several reasons. One reason is that longitudinally welded tubes (like Coil tubing) may have a weld bead at the tube ID (attachment, Fig.1). Such bead however could cause high local contact stresses during cone expansion (contact stress between cone-OD and tube-ID, typically using a perfectly round cone) as well as some kind of out-of-roundness after expansion. A way of overcoming such problems shall be presented here. The width of a weld bead is only relatively small. A small groove or recess in the cone OD (still large enough to cover the complete bead area including tolerances) would avoid contact with the weld bead (attachment, Fig.2 & 3). Since such recess is small the remaining contact area is supposed to be large enough to take the expansion loads. Moreover roundness after expansion will hardly be affected (or could even be compensated by a non-perfectly round cone). Obviously orientation of such a cone is required. In case of round-to-round expansion this usually is not required and would require some additional effort. However in case of folded tubes (and the idea came into mind particularly for such applications) the cone has to be oriented anyway (cone has to be designed in order to fit into the folded shape and to most smoothly unfold and expand – see attachment, Fig.4 & 5).The folded profile again has to be oriented with respect to the position of the weld (i.e. the weld is placed at a certain position of the folded tube where stresses and strain during unfolding are rather low). Such positioning should not cause any additional efforts during manufacturing of such a folded tube.

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Cone with Longitudinal Groove

The invention basically is about a small modification of a conventional expansion cone i.e. a longitudinal groove or kind of recess in order to allow for expansion of longitudinally welded tubes having a weld bead at the inner diameter. Without such recess high local contact stresses - leading to accelerated wear or damage to the surfaces and material of cone and tube - as well as out-of-roundness after expansion must be expected. The idea seems to be particularly suitable for expansion of long (eventually coiled) folded tubes.

In expansion technology usually (short, threaded) seamless tubes are used for several reasons. One reason is that longitudinally welded tubes (like Coil tubing) may have a weld bead at the tube ID (attachment, Fig.1). Such bead however could cause high local contact stresses during cone expansion (contact stress between cone-OD and tube-ID, typically using a perfectly round cone) as well as some kind of out-of-roundness after expansion. A way of overcoming such problems shall be presented here. The width of a weld bead is only relatively small. A small groove or recess in the cone OD (still large enough to cover the complete bead area including tolerances) would avoid contact with the weld bead (attachment, Fig.2 & 3). Since such recess is small the remaining contact area is supposed to be large enough to take the expansion loads. Moreover roundness after expansion will hardly be affected (or could even be compensated by...