Abstract:
The invention is particularly directed to the problem of creep deformation in a coiled aluminium strip, which occurs during coiling and for a period thereafter. the problem arises because the profile of the strip across its width is not flat, and is in fact usually thicker in the middle than at the edges (positive crown). To cater for this, the invention provides that the spool (1) onto which the coil is wound is adapted to provide more support to the strip in the centre than at the edges. Various ways of achieving this are described; one example, as illustrated, is to make the central portion (2) of the spool (1) of greater diameter than the end portions (3) of the spool. A strip having a positive crown which is wound onto such a spool was found to exhibit significantly reduced creep strain, leading to reduced creep deformation.
Abstract:
A method of manufacturing a heating tube having internal grooves formed in a grooving process (1) and formed in a forming process (2), comprising the steps of softening the tube in an annealing process (3), and orderly winding in an orderly winding process (4), wherein, in the annealing process (3), the heating tube is heated and gradually cooled while being fed in longitudinal direction and, in the orderly winding process (4), the labor for the operation to install the heating tube on a bobbin is reduced by orderly taking in the heating tube on the drum part of the bobbin.
Abstract:
A good heat treatment of metal coils (31, 32) is obtained by means of gaseous hot media, whereby said metal coils are successively wound with support frames (10) between them. According to the invention, a low-cost robust support frame (10) may be obtained, whereby an I-profile is used as frame profile (28), to construct a frame, which then forms the support frame (10). The I-profile web has rows of holes (24), to serve as a guide for the medium.
Abstract:
An integrated continuous casting and in-line hot rolling process comprises in sequence, upstream of the hot finishing rolling, a step of coiling and subsequent uncoiling of a pre-strip having a thickness of 6-15 mm, followed by a step of plastic stretching to make easier the subsequent elimination of scale thus rendering possible in the hot rolling step the production of ultrathin coils with a thickness down to 0.6 mm which can replace, for particular applications, cold rolled strips. It is preferably provided, upstream of the coiling/uncoiling step, a step of induction heating with temperature being controlled. The plant carrying out such a process comprises for coiling/uncoiling (11) of the pre-strip (10) at least two coilers provided with a mandrel (20) preferably with an internally cooled shaft (21) being thermally insulated towards the outer central body (22) to which a pair of lateral steel segments (23) are advantageously assembled by interlocking fit.