EP0013653B1 - Device for manufacturing bent angle irons - Google Patents

Abstract

1. A device for the manufacture of collar members flanged internally or externally by longitudinal rolling of one of the flanges of an L-section, the device comprising at least one press having a plurality of rolls which may possibly be frustoconical and have line contact with the L-section which is to be rolled and which are driven in order to roll one flange of the said L-section and have at the ends of the rolls gaps for the other flange of the L-section to pass through, characterized in that the L-section (8e, 8f) is obtained by profiling a strip (2) in a profiling train (4, 5, 6, 7) and in that the bending press (10) for obtaining an internal flange and the curving press (20) for obtaining an external flange include for the bending or curving of the L-section (8e, 8f) only two rolls (11, 12) and (21, 22) in which firstly the lines of contact of the rolls (11, 12) form with one another an angle of form 0.1 to 3 degrees whilst the gap at the end of the rolls (11, 12) for the other flange (8e) of the L-section to pass through is provided on that side at which the lines of contact are not furthest separated from one another, and secondly the lines of contact of the rolls (21, 22) form with one another an angle of from 0.1 to 3 degrees whilst the gap at the end of the rolls (21, 22) for the other flange (8f) of the L-section to pass through is provided on that side at which the lines of contact are furthest separated from one another, and in that the positions of entry of the L-section into the bending press (10) and into the curving press (20) are identical.

Description

The invention relates to a device for manufacturing elements of circular flange sleeves by folding a strip into a straight angle followed by the longitudinal rolling of one of the two wings of said angle.

It is necessary, for various industrial applications, to be able to have parts similar to elements of cytometric sleeves with an external or internal flange, substantially planar, the sleeves obtained with these elements being, as required, used open or closed, their ends being separated or joined, welded or not, or even covering.

Such sleeves are commonly obtained by stamping, which has the disadvantage of causing ruptures due to the large differences in stretching between zones of different diameters.

It has been tried to bend angles on bending machines, but the products obtained have embossing or notch defects on the flanges.

It has also been proposed in document FR-A-2 329 370 to conform a sheet metal to a cylinder mounted on a mandrel at the end of which a part of the cylinder is folded by pushing back until it takes the circular shape of an internal or external flange to the cylinder.

Such a process requires that as many mandrels are available as the diameters to be obtained. The operating mode is of the unit type, that is to say that the parts must be manufactured one by one, which is time-consuming and labor-intensive.

It has been proposed in document DE-C-952 143 to laminate an angle wing by two cylindrical rollers, but such an arrangement does not make it possible to obtain all types of angle on its own.

Document GB-A-11.692 also discloses a machine for making sleeves with an outer flange or an inner flange, but this machine is designed as a rolling mill working hot irons and always using three rolling rolls with, in addition, rolls auxiliaries to initiate the bending or curvature of the irons. In addition, the rolling rolls are frustoconical or with an inclined axis to produce flanges with an inclined face. Thus designed, this machine cannot be used to manufacture from a cold-worked strip sleeves with an essentially flat outer or inner flange.

The object of the invention is to propose a new device making it possible to obtain cold at high speed from a strip of elements of sleeves with internal or external flange of very good quality and to adjust their diameters as desired, according to needs, without the need to modify the installation. Another object of the invention is to provide an installation capable of producing, continuously, elements of sleeves with internal or external flanges in a wide range of diameters.

The objects of the invention are achieved by a device which comprises at least one press having a plurality of possibly frustoconical cylinders with contact lines with the L-profile to be laminated, driven for the rolling of a wing of this L-profile with , at the end of the cylinders, a passage space for the other wing of the L-profile, with which the L-profile is obtained by profiling a strip in a profiling train, however the bending press for obtaining an internal flange and the bending press for obtaining an external flange comprise for the bending or the curvature of the L-profile only two cylinders in which on the one hand the contact lines of the cylinders mutually make an angle of 0.1 to 3 ° while the the passage space of the other wing of the L-profile at the end of the cylinders is provided on the side where the contact lines are not the most distant from one another and on the other hand the contact lines of the cylinders angle of 0.1 to 3 ° while q ue the passage space of the other wing of the L-profile at the end of the cylinders is provided on the side where the contact lines are furthest apart from each other, the entry position of the L-profile in the press bending and the bending press being identical.

It is preferable that the device comprises, upstream of the press or presses, a means of unwinding a strip of tape wound in a roll and, in addition, a guide and cutting means mounted downstream of the press or presses.

Thanks to a device thus designed, one obtains from a strip, by operating cold, sleeves of different diameters by means of simple adjustments, having a choice of an external flange or an essentially flat internal flange.

It will be noted that, by stretching the laminated wing by means of the bending press, the latter is rolled up with a concavity facing the other wing which, non-laminated, tends to create resistance to drawing of the fibers closest to the laminated wing. It is to overcome this resistance that it is advantageous for the lines of contact of the cylinders with the strip to converge towards the fold at an angle of approximately 0.1 to 3 °, so that the fibers of the laminated wing are subjected to an increasing stretching force when one approaches the fold and that all the longitudinal fibers of this wing parallel to the fold finally have substantially the same elongation.

Likewise, we obtain, by differentiated stretching of the laminated wing by the flat bending press, that the latter undergoes a stretching of the longitudinal fibers decreasing from the edge towards the fold, where, due to the presence of the other wing, the stretching is weak or zero, so that the laminated wing curves in its plane to form a cir planar ring on the inner edge of which then stands the other wing which will constitute a sleeve element by winding without significant resistance perpendicular to its plane.

The Applicant has been able to observe that, in the device according to the invention, the embossing and notch defects caused by bending with a bender are eliminated.

Other advantages will emerge from the description, which will be given below by way of example only, of an embodiment of the invention.

• -la figure 1 est une vue schématique en plan horizontal de l'installation de fabrication de cornières centrées,
• - la figure 2 est une vue à plus grande échelle de la partie droite de la figure 1.

For this purpose, reference is made to the appended drawings, in which:

• FIG. 1 is a schematic view in horizontal plane of the installation for manufacturing centered angles,
• - Figure 2 is an enlarged view of the right part of Figure 1.

The installation described is designed for the manufacture of angles for protecting strip reels for their transport. A type of angle iron for this use must have, to protect the edges of the strip in the vicinity of the central recess, a coiled wing of small bending diameter with a flange on the convex side, here called external flange. A second type is necessary to protect the edges of the strip on the periphery of the coil, this type having a coiled wing of larger diameter than the first type and a flange on the concave side, here called internal flange.

It is customary for such angles to be annular with edges overlapping freely at their ends or in the form of annular sectors used in pairs overlapping freely at their ends.

However, the application of the installation described is not limited to the production of curved angles for the protection of the strip reels, the user being able to cut the curved strips at any desired sector, in particular 360 °, and weld the ends if necessary, for example to obtain cylindrical flange sleeves.

Upstream of the installation proper, there is a reel 1 with a vertical axis for unwinding a strip 2. The strip 2 enters the installation between two guide rollers 3 with vertical axes and then crosses a profiling line, at an angle 8, of a type known per se, comprising four trains 4, 5, 6, 7 duo of cylinders with vertical axes leading progressively, according to 8a, 8b, 8c to a square profile 8.

After the exit of the last train 7, there are installed aligned, and in the exit alignment of the angle iron 8, two rolling presses, respectively 10 and 20, respectively called bending and flat bending. Only one of the two presses is in use at a given time, the cylinders of the press 10 being separated to allow the angle iron 8 to pass when the press 20 is to be put into service.

In what follows, it will be assumed that the angle iron 8 is presented to the presses 10 or 20 with one wing 8f perpendicular to the plane of the figure and the other wing 8e towards the bottom of the figure in the plane parallel to that of the figure farthest from the observer of this figure.

The two cylinders 11 and 12 of the bending press 10 have vertical axes and are provided for laminating the wing 8f, and leave, at least at the end furthest from the cylinder 12 from the bottom of the figure, a space, on the side of the frame, for the free passage of the 8th wing.

If the two cylinders are geometrically cylindrical, it is understood that the rolling of the single wing 8f, clamped by the wing 8e not subjected to rolling, will tend to stretch its fibers all the more as they will be further from the wing 8e, whence a winding according to 8y accompanied by a warping away the angle thus wound behind the plane of the figure to be received on a horizontal plate 30, also in the background of the figure, where it is then supported by rollers 31 with horizontal axes. However, to avoid excessive helical warping, it is advantageous for the cylinders of the press 10 to be slightly frustoconical and present an angle of 0.1 to 3 ° between them on the contact generatrices, the generatrices of the cylinders being as close as possible to each other in close proximity to the edge between the wings 8e and 8f. In this way we reduce, and we can even almost eliminate warping since we exert a greater rolling force on the fibers near the edge than on the most distant fibers. But then, it is advantageous to subject the wing 8e to a pushing force by means, for example, of a roller 11 'with horizontal axis arranged in the space provided between the cylinder at the bottom of the figure and the frame.

We see that, by the choice of the dimensions of the strip and the angle iron, by the choice of the metal which composes them and by the choice of the pressure exerted by a device 13 for pressurizing the laminating press 10, we are master of the curvature of the elements of outer flange sleeves which, after having been guided by a roller 14 with a vertical axis, are received on more or less distant rollers 31 provided on the plate 30 for different radii of curvature.

The two cylinders 21, 22 of the press 20, of which only the cylinder 21 which conceals the cylinder 22 is seen, are with horizontal axes, are provided for laminating the single wing 8e and leave, at least at the end of the cylinder 21 , a space 23 on the side of the frame for the free passage of the wing 8f.

The two cylinders 21 and 22 are frustoconical and have between them, on the contact generators, an angle of 0.1 to 3 °, the generatrices of the cylinders being at most close to each other on the side of wing 8f furthest from the fold of connection with wing 8e. In this way the longitudinal fibers of the wing 8f are the most stretched on the edge furthest from the edge, while the longitudinal fibers of the wing 8f in the vicinity of the edge are only slightly or not at all. stretched. We thus obtain that the wing 8e is stretched in a differentiated manner while being bordered by the wing 8f not stretched, from where a partial rolling of the wing 8e which is arranged in a flat crown around the wing 8f constrained then to wind up perpendicular to its plane. In the rolling operation of the wing 8e, the wing 8f undergoes stretching stresses in the vicinity of the edge, hence a slight warping which can be used to direct the angle iron, for example, towards the plate 30 where, after being guided by a roller 25 with a horizontal axis, it is received, in the form of a sleeve element with an external flange, on rollers 32.

By adjusting a rolling pressure device 24 acting on the rolls 21 and 22 and by choosing other parameters, it is possible, as with press 10, to obtain from press 20 any desired curvature.

The plate 30 further comprises at least one device 35 of known type with guillotine blade for cutting the elements of the sleeves. This device 35 is mobile and can be fixed at will on the plate 30, for example 180 ° from the point of curvature of the elements 8z or for example 120 ° from the point of curvature of the elements 8y, or any other suitable place.

It will be noted that the setting in quadrature of the axes of the two presses makes it possible to obtain the winding of the products in a single plane and not in two orthogonal planes which simplifies the reception and the cutting of the products.

It is possible to turn the press 20 180 ° so that the winding of the products bent by this press takes place in the opposite direction to that of the products bent by the press 10 on a second plate also equipped for cutting up the products.

It is also possible to introduce directly into one of the two presses 10 and 20 of strip strips so as to obtain, no longer elements of sleeves with internal or external circular flanges, but elements of ferrules without flanges or elements flat rings.

Claims (3)

1. A device for the manufacture of collar members flanged internally or externally by longitudinal rolling of one of the flanges of an L-section, the device comprising at least one press having a plurality of rolls which may possibly be frustoconical and have line contact with the L-section which is to be rolled and which are driven in order to roll one flange of the said L-section and have at the ends of the rolls gaps for the other flange of the L-section to pass through, characterized in that the L-section (8e, 8f) is obtained by profiling a strip (2) in a profiling train (4, 5, 6, 7) and in that the bending press (10) for obtaining an internal flange and the curving press (20) for obtaining an external flange include for the bending or curving of the L-section (8e, 8f) only two rolls (11, 12) and (21, 22) in which firstly the lines of contact of the rolls (11, 12) form with one another an angle of from 0.1 to 3° whilst the gap at the end of the rolls (11, 12) for the other flange (8e) of the L-section to pass through is provided on that side at which the lines of contact are not furthest separated from one another, and secondly the lines of contact of the rolls (21, 22) form with one another an angle of from 0.1 to 3° whilst the gap at the end of the rolls (21, 22) for the other flange (8f) of the L-section to pass through is provided on that side at which the lines of contact are furthest separated from one another, and in that the positions of entry of the L-section into the bending press (10) and into the curving press (20) are identical.

2. A device as in Claim 1, characterized in that it includes upstream of the press or presses (10, 20) a device (1) for unreeling a metal strip (2) wound in a reel.

3. A device as in Claim 1, characterized in that it includes at least one device for guidance (30) and cutting (35) mounted downstream of the press or presses (10,20).

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