ES2439238T3 - Wire drawing device - Google Patents

Abstract

Wire drawing device with a wire drawing drum (1) having an outer surface and an inner drum surface, in which the wire drawing drum (1) has a 5-shaped profile and a rotation axis (R), in which a cooling device is also made inside, by means of which cooling liquid (7) is driven on the inner wall of the wire drawing drum, and in which the inner wall (8) It has structures that extend in the direction of the axis of rotation (R) and also presents an unstructured region in the area of the free edge of the cap, characterized in that the drawing disk (1) in the area of the base of the cap presents an unstructured area adjacent to the structure and by which a height (h) of the structures made as ribs (11) corresponds to the height (h ') of the cylindrical outer surface of the trefil disc drum Adopted, but displaced downward, so that an overlapping with an inlet zone (E) of the drawing disc drum is obtained which is also subjected to the greatest thermal stress.

Description

Wire drawing device.

The invention relates to a wire drawing device according to the features of the preamble of claim 1. Such a wire drawing device is known from GB 794316.

Regarding the state of the art, reference must first be made to documents EP 1502669 A1 and EP 0752287 B1. Also to GB 781011. In the wire drawing device known to them, the wire drawing drum is provided in the area of the base of the cap with a vertical structure to which a horizontal structure is directly attached below. In addition, reference is made to GB 794316 in which a vertical structure is made that continues directly to the base of the hat.

The invention, based on the last mentioned document, proposes the object of indicating an advantageous embodiment of the interior of the drum of the wire drawing disk as regards cooling.

This object is carried out with the content of claim 1, so that it is provided that the wire drawing drum has an unstructured area adjacent to the structure in the area of the hat base and that the height of the structure made as ribs, it corresponds to the height of the cylindrical outer surface of the wire drawing drum, but displaced downwards, so that it results in an overlap with an input area of the wire drawing drum subjected to the greatest thermal stress.

The structure is limited in height by the adaptation to the cylindrical outer surface, therefore the structure can only be provided with a limited but effective height. In addition, there are advantages regarding the drawing technique, since an unstructured area is provided in the area of the base of the hat.

Furthermore, it is preferably provided that the height of a structure measured perpendicular to the axis of rotation corresponds to a quarter wall thickness relative to the measurement of a wall thickness of the wire drawing drum. With this, obviously, the depth of the valleys between the structures is also determined at the same time, thus preferably presenting the structures, respectively, the same height in the circumferential direction. Despite this, however, individual structures can also have different height.

However, it is also preferable that the structures are made rotationally symmetrical. If different height structures are provided in this context, more preferably they alternate regularly across the contour.

Within the framework of the invention it is possible that a structure consists of a succession of elevations adjacent to each other in the vertical direction. However, it is especially preferred in this context that the structure consists of continuous ribs spaced apart in the circumferential direction of the inner surface of the drum. Since the structure extends in the direction of the axis of rotation only through a part of the inner wall, only relatively little liquid will flow vertically upwardly to the interior spaces between the structures, above the nozzle. This takes into account the fact that normally the nozzle that discharges cooling liquid and is directed to the structure is not associated with an area of the cap (cap base) of the drawing drum, but is preferably arranged approximately in the center of the vertical height of the drawing drum. In addition, the cooling demand of such a drawing drum, even in the lower area that overlooks the cap edge, is maximum, since the greatest wire drawing work is carried out there with the corresponding heating. The structure also extends in the area of the leading edge (referred to the outer surface of the drawing drum). Below this edge, as well as above, at a certain distance from the drawing drum cover, the structure is completely missing. In this sense, an unstructured interior wall is made.

The aforementioned height of a structure or nerve, measured perpendicular to the axis of rotation, preferably corresponds to approximately between 1/3 and 2/3 of the wall thickness (without ribs) of the drawing drum in this area.

As previously indicated, the fluid outlet of the cooling device overlaps radially with the structure. More preferably it is a spray nozzle that sprays the cooling liquid, as a rule water, directly on the inner surface of the drum that rotates through the fixed nozzle.

In the following, the invention will be explained in detail by virtue of the attached drawing which, however, represents only one embodiment. In it they show:

Figure 1, a basic schematic construction of a wire drawing drum with an associated drive;

Figure 2, a cross section through the cylinder part of a wire drawing drum; Y

Figure 3, a cross section of the object of Figure 2, cut along the line III-III.

First of all, with respect to FIG. 1, a drawing disc drum 1 of a wire drawing device which together presents several of such drawing disc drums 1 is represented and described.

The drawing disc drum 1 has a cover 3 preferably threaded together which in turn is driven by a drive 4 through an axis 5.

5 The cover 3 forms the base of the cap with respect to a profile of the drawing disc drum 1 shaped as a cap.

Inside the drawing disc drum 1, a nozzle 6 of cooling liquid is disposed that sprays cooling liquid, in the example of embodiment water 7, on an inner surface 8 of the drum.

In the lower area of the drawing disc drum 1, the motor 4 is connected by flanges to a fixed support 9 which at the same time forms the transition zone 10 towards the rotating drum 1.

As regards the embodiment of the more detailed wire drawing drum 1, reference is made to Figures 2 and 3. Inside the wire drawing drum 1, ribs 11 which extend vertically are made. The height of the ribs 11, measured perpendicularly to an axis of rotation R of the wire drawing drum, corresponds approximately to the wall thickness of the wire drawing drum in the area where the 15 ribs are made. As for the drawing disc drum itself, it can be a piece made from sheet steel. The ribs 11 may be formed by an area of the steel sheet having a wall thickness approximately double that originally provided by vertical spaces. But also in the case of a steel casting can be integrally formed. In addition, the ribs 11 could also be formed by a piece available inside which, for example, is welded. For this it would be recommended in

In particular, make perpendicular supports that extend in the circumferential direction, which suitably present in the area of the valleys between the ribs 11 an essentially smaller height than the ribs 11.

The height h of the ribs 11 corresponds approximately to the height h ’of the cylindrical outer surface of the wire drawing drum. However, it is somewhat displaced downwards, so that it results in an overlap with the inlet zone E of the drawing disc drum also subjected to the greatest tension.

25 thermal.

The liquid sprayed on the ribs 11 is aspirated by a system not shown and conducted in a circuit, possibly subject to intermediate cooling.

Claims (5)

1. Wire drawing device with a wire drawing drum (1) having an outer surface and an inner drum surface, in which the wire drawing drum (1) has a profile in the form of a cap and a rotation axis (R), in which a cooling device is also made inside, by means of which cooling liquid (7) is driven on the inner wall of the wire drawing drum, and in which also the inner wall (8) has structures that extend in the direction of the axis of rotation (R) and also has an unstructured region in the area of the free edge of the cap, characterized in that the drawing disc drum (1) in the base area of the hat has an adjacent unstructured area 10 to the structure and why a height (h) of the structures made as ribs (11) corresponds to the height (h ') of the cylindrical outer surface of the wire drawing drum, but displaced downwards, so that an overlap results with an inlet zone (E) of the wire drawing drum which is also subject to the highest thermal stress.

2.

 Wire drawing device according to claim 1, characterized in that the structures are rotationally symmetrical.

3. Wire drawing device according to one of claims 1 to 2, characterized in that the height of a structure measured perpendicular to the axis of rotation (R) corresponds to a quarter wall thickness with respect to the measurement of the wall thickness of the wire drawing drum (1).

Four.

Wire drawing device according to claim 3, characterized in that the height of a structure 20 corresponds to half the wall thickness of the drawing disk drum.

5. Wire drawing device according to one of claims 1 to 4, characterized in that the cooling device has a fluid outlet and that the fluid outlet made radially inside with respect to the structure overlaps radially with the structure .