DE1067760B - Drawing wheel - Google Patents

Description

The invention relates to wire drawing machines with several drawing disks, which work in a straight line. A slip-free drawing of the wire is not possible with these machines for several reasons. Once the circumferential speeds of the individual stages with an economically justifiable Do not coordinate effort in such a way that it corresponds exactly to the required pulling speed; on the other hand, the decrease in the wire diameter is usually not exactly what was expected, since the clear diameter the drawing dies increases according to the wear. In particular, there is a precise regulation of the The speed of the drawing disks is difficult to achieve if three-phase motors are used to drive the drawing stages be used, which is desirable for cost and operational reasons. So you even have to In the case of so-called sliding-free pulling, ensure that the turns on the pulling disk can slide is to avoid wire breaks.

There are drawing pulleys known that are not positively connected to the drive shaft, but are driven by the drive shaft via friction surfaces. Such a drawing disk can be on the drive shaft slip, whereby the tensile force at which a slip occurs is independent of that on the disc number of turns of wire located. The disadvantage here is that the transferable from the friction surfaces Torque cannot be kept constant. The coefficient of friction can increase over time change to double the value, whereby the maximum permissible tensile force is exceeded and the wire breaks when the wire supply is too low.

The slip always starts with a certain tensile force when the number of Wire turns on the drawing disk is not larger than it is for the entrainment of the turns when pulling is required. This means that the number of turns is small and, above all, limited and the turns do not have time to cool down before they are fed to the next drawing die. For the For the durability of the drawing dies, it is essential that the temperature of the wire is as low as possible. The invention aims to provide a design of the drawing disk, which despite the high number of turns on the Pulling disk allows the windings necessary for the entrainment of the wire to slide.

According to the invention, with a normal cleavage pulling disk with a cleavage edge below, adjoining drawing edge as well as a conical jacket still adjoining this, from the upper part of which the wire runs to the next disk, either part of the wire wound circumferential surface of the disc or part of the clump edge including the entire drawing edge

Applicant:

Machine factory Herborn
Berkenhoff & Drebes AG,
Herborn (Dillkr.)

Hans Pfeiffer, Herbom (Dillkr.),
has been named as the inventor

and a portion of the wire-wound surface area from the surface of one in a groove of the Disc freely rotatable, preferably formed on rollers mounted ring. In the first case, the whole Connect the drawing edge to the clump edge; it must then be the entire height of the drawing edge be filled with turns before the ring itself can take turns. That has with changing Wire diameter the consequence that with small wire diameters more turns on the drawing edge lie than is necessary to take along, so that this does not occur if the permissible wire tension is exceeded can slide. The pulling edge can, however, also be divided and arranged on both sides of the ring be. In this case, the height of the part of the drawing edge upstream of the ring is kept so low that that the number of turns thereupon is always below the necessary. The remaining turns can then be applied in the desired number on the part of the drawing edge that the movable ring is connected downstream. In this case, the turns sitting on the loose ring of some of the tensile stress is relieved.

In the second case, when a part of the Schollrand including the entire drawing edge and one Part of the outer surface of a normal drawing disk is formed by the freely rotatable ring in connection with the rotatable ring remaining part of the conical surface of the drawing disk Draw edge. The entire ring is here occupied with turns, and the number on the actual drawing edge seated coils remains freely selectable,

909 640 / 1EO

Claims (2)

d. H. that the friction can be adapted to the respective requirements. For the mode of operation it is of course irrelevant in which position the drawing disk is. Usually this is arranged so that the clump edge is at the bottom. However, it can take any position. It is known to arrange a resilient ring on the drawing disks of wire drawing machines operating in a straight line, onto which the number of wire turns required for driving the wire turns during drawing is wound. This ring has the advantage that it prevents the wire windings from grinding on the drawing disk if the wire tensioning wears off for any reason. The ring then springs open and no longer performs any movement relative to the wire windings, but rather grinds with its inside on the drawing disk. However, such a resilient ring is not a suitable means of increasing the number of wire turns on the pulling disk. With a larger number of turns, the ao ring can no longer spring open even if the wire tension decreases, since the friction between the turns is too great. Regarding the state of the art, it should also be said that it is known to cool the drawn wire between the individual drawing stages by switching on idle drums in the machine over which the wire wraps around them several times. When manufacturing longitudinally welded pipes, the goods are usually cooled in this way. Also, when pulling means is applied, the wire is often allowed to run over freely rotatable drums with multiple loops and is flushed with air from the outside in order to dry the pulling means. Several exemplary embodiments of the invention are described below with reference to the drawings (FIGS. 1 to 4), in which half of a drawing disk is shown in section in the individual figures. In Fig. 1, 1 designates the drawing disk with the cleat edge 2 and the drawing edge 3. Above this edge, the diameter of the disk is offset inwards. In its cylindrical part 4, a ring 6 is freely rotatably mounted via a needle bearing 5, the outer jacket of which forms the continuation of the drawing edge 3. The ring 6 is supported on the shoulder 7; for fastening the bearing 5 and the ring 6, a cover-like part 8 is used, which closes the pulling disk at the top. The wire running up on the Schollrand 2 is denoted by 9; 10 are the wire windings lying above this wire on the drawing edge 3; the turns lying on the jacket of the ring 6 are denoted by 11 and the wire end that runs off is denoted by 12. Only the wire windings 10 are decisive for the friction entrainment. The turns 11 can rotate freely with the ring 6. The height of the ring 6 can be adjusted so that the turns can cool down. In the construction of the drawing disk according to FIG. 1, the drawing edge 3 must always be covered with turns from the cleat edge to the ring 6 if further Yvrindungen are to be received by the ring 6. Since the number of turns on the drawing edge determines the friction between these and the drawing pulley, the frictional force between pulley and wire changes when the wire diameter and thus the number of turns change. One is therefore not in a position to adjust the friction precisely in such a way that the wire 7 is reliably carried along, but if the subsequent wire tension is excessive, a slip between the wire windings 10 and the disk is possible. The embodiment according to FIG. 2 avoids these disadvantages. Here, the freely rotatable ring 13 lies in front of the drawing edge 3 of the drawing disk designated 14. The ring 13 formed with a shoulder 15 is mounted via needle bearings 5 on a flange ring 16 which is screwed to the drawing disk 14. The wire 9 runs onto the cleat 15 of the ring 13. This is then followed by the turns 11, which can rotate freely with the ring 13; only above are the turns 10 on the pulling edge 3, which determine the friction between the pulling disk and the wire. As can be seen from FIG. 2, the number of these turns can be selected as desired, i. That is, it can be adapted to the friction desired in each case. In Fig. 3 the drawing disk has a fixed drawing and clipping edge. The flange ring 17 namely has a cleat 18 with a small pulling edge 19. The wire 9 runs on the cleat 18 and forms the first turns 8. Then the turns 11 follow on the ring 20 (which in contrast to the ring 13 according to FIG. 2 has no Schollrand) and on the drawing edge 3 again turns 10, the number of which can again be selected. In this embodiment, the windings 11 only have to absorb the tensile stress that the windings 10 require on the drawing edge 3. 4 shows a drawing disk with a double train known per se; it is composed of a drawing disk according to FIG. 2 and one according to FIG. 3. The ring 21 forms a second pulling edge 22 and is screwed to a further ring 23, which serves to accommodate a second needle bearing 24 and a second ring 25. The turns 11 lie above the clump edge at 9 and then the turns 10 on the drawing edge 22 of the first drawing stage. The number of turns 10 can be freely selected for both the first and the second stage. Patent claims: 1. Pulling disk with a rotatable relative to the disk and wound with the wire Ring in which the drag force that can be transferred from the disc to the wire on the friction path above a certain number of turns regardless of the number of turns on the disk The number of turns of wire is characterized in that with a usual cleavage Pulling disc with clipped edge below, followed by a pulling edge and one on top of this further adjoining conical jacket, from the upper part of which the wire to the next disc expires, either a part of the wire-wound surface of the disc (1, 14) or part of the Schollrandes (15) including the entire drawing edge and part of the wire wound circumferential surface from the surface of a freely rotatable in a groove of the disc, preferably is formed on rollers (5) mounted ring (6, 13, 20). 2. drawing wheel according to claim 1 in two-stage construction, characterized in that in the part of the outer surface of the disc wrapped with wire and in the lower one Slice part of the pad edge including the entire drawing edge and part of the with Wire-wound outer surface of the disc is formed from the surface of the ring.