EP1514617A1 - Drawing device and method of operating a drawing device - Google Patents

Abstract

The bench has a drawing die (2) through which an elongated continuous metal workpiece extends. A drawing carriage (4) draws the work-piece through the die and is displaced along a linear path downstream of the die. A linear drive (8) displaces the carriage to and from the die along a path through a distance equal to a preset length of a drawn product to be produced. A cutter downstream of the path cuts the drawn product. An independent claim is also included for a method of operating a drawing apparatus.

Description

The invention relates to a pulling device, in particular for the processing of Rods, tubes and semi-finished products of metal, comprising: a pulling tool, through which the material to be pulled is pulled, a drawing slide, the pull in direction Behind the drawing tool, the material to be drawn along a straight Can pull a track, as well as a cut-off device, with the drawing of the Well, individual sections of defined length can be cut off. Of Furthermore, the invention relates to a method for operating a pulling device.

For processing, in particular, of bars, tubes and semi-finished products Metal, especially steel and non-ferrous metals, are drawing devices of the generic type Kind needed. In these, the material to be drawn through a Pulling tool (drawing ring) pulled. In the transport direction behind the drawing tool there is a cutting device, by means of the sections of desired length are cut off from the material initially present as a continuous strand.

Drawing devices are divided into two groups, namely once in drum drawing machines and once in straight drawing machines. In the case of the straight-pull drawing machines, in turn, those are known which pull the drawn material in the so-called hand-to-hand operation by means of two drawing carriages which can be moved back and forth in opposite directions. In another embodiment, working with two counter-rotating pull chains; the latter devices are also known as caterpillar drawing machines. Such machines are described, for example, in EP 0 548 723 B2 and in EP 0 814 921 B1 . They have the advantage over hand-to-hand drawing machines that their circulating chains pass uniformly in one direction and therefore no masses have to be accelerated intermittently.

In the finishing area of production lines for tubes, rods and semi-finished products Steel and non-ferrous metals are used to cut to length sections pulling goods with the desired length straight-pull machines, which work continuously with two drawing carriages, which alternately grip the material to be drawn and pull. Behind the drawing machine are the sections of about 4 to 6 Meter length generated by means of a moving cutter (saw).

The mechanical drives of the prior art straight draw machines allow only small strokes, whereby several strokes are necessary for a finished length (s. the above-mentioned hand-to-hand operation). In such a construction would be a discontinuous work only with significant losses in productivity possible, since the previously known mechanical drives of the drawing slide a have very high inertia.

A disadvantage of the prior art pulling devices that they are relatively prone to failure are and require a high level of maintenance. Furthermore, their productivity not very high. By the arranged on the pulling device "flying" Saw (moving cutter) results in a complex structure, which leads to high costs.

The invention is therefore the object of developing a pulling device of the type mentioned in such a way that the aforementioned disadvantages are avoided. Furthermore, an improved method for operating a pulling device is to be provided.

The solution of this problem by the invention is according to the device characterized in that only a single drawing slide is provided, which is moved by means of a linear drive.

As a result, an intermittent (discontinuous) operation is possible, the - how will be seen - has significant benefits.

A preferred embodiment of the invention provides that the linear drive is designed according to the principle of an electric linear motor.

It can be provided that the linear drive a linear displacement can cover at least the largest measure of the length of the desired Sections of the estate to be drawn corresponds.

Advantageously, the cutting device is arranged stationary.

Furthermore, it can be provided that in the stripping direction before the drawing tool an unwinding device is arranged for a coil of the material to be drawn. These can be controllable or controllable means for influencing the unwinding speed exhibit.

a) Herstellen einer Zugkraft übertragenden Verbindung zwischen dem zu ziehenden Gut und dem Ziehschlitten an einer Startposition in Abziehrichtung hinter dem Ziehwerkzeug;

b) Bewegen des Ziehschlittens. mittels eines Linearantriebs in Abziehrichtung von der Startposition zu einer Endposition;

c) Lösen der Zugkraft übertragenden Verbindung zwischen dem zu ziehenden Gut und dem Ziehschlitten an der Endposition;

d) Zurückbewegen des Ziehschlittens mittels des Linearantriebs entgegen der Abziehrichtung von der Endposition zur Startposition;

e) Erneutes Herstellen einer Zugkraft übertragenden Verbindung zwischen dem zu ziehenden Gut und dem Ziehschlitten an der Startposition;

f) Wiederholen der Schritte b) bis e) zur Herstellung weiterer Abschnitte des zu ziehenden Guts.

The method for operating a pulling device is based on such a pulling device, which has a pulling tool through which the product to be pulled is pulled, a drawing slide, which pulls in pull-off direction behind the drawing tool, the material to be drawn along a straight path, as well as a cutting device, with the good to be drawn by the individual sections can be cut off. According to the invention, it is provided here that the method has the following steps:

a) producing a tensile force transmitting connection between the material to be pulled and the drawing carriage at a starting position in the stripping direction behind the drawing tool;

b) moving the drawing carriage. by means of a linear drive in stripping from the starting position to an end position;

c) releasing the tensile force transmitting connection between the material to be pulled and the drawing carriage at the end position;

d) moving the drawing carriage back by means of the linear drive in the opposite direction to the drawing-off direction from the end position to the starting position;

e) re-establishing a tensile force transmitting connection between the material to be pulled and the drawing carriage at the starting position;

f) repeating steps b) to e) for producing further sections of the material to be drawn.

It is preferably provided that the distance between the starting position and the end position of the length of the desired portions of the Guts to be pulled equivalent.

Furthermore, during said steps c) and / or d) and / or e) a Cutting the material to be drawn near the end position by means of the cutting device take place, which is arranged stationary.

A further improvement of the method results when the unwinding device for a coil of the property to be pulled is controlled or regulated so that a Leveling sheet is formed during the above steps c) and / or d) and / or e), whose length is substantially equal to the length of the desired sections of the corresponds to drawing good.

The inventive proposal of a pulling device and the associated Methods for their operation have various advantages:

The pulling speed of the drawing carriage is in relation to previously known solutions considerably higher. The increased pulling speed leads to an increase in capacity and so to a higher productivity of the plant, which cost Benefits.

Drawing machines that work with the proposed linear actuators allow a much larger carriage stroke than previously known devices. there can be achieved in a simple manner, a stroke of about 3 meters, this Value can also be increased. This becomes a discontinuous operation the drawing machine with only a single drawing slide possible.

The carriage stroke can be adapted to the maximum Ziehgutlänge, so that only a single stroke is required for the finished length. The stock can then be cut during the return stroke behind the drawing machine at a standstill. By discontinuous pulling so is the use of a stationary separator possible because sufficient time remains during the return stroke, the Separate pulling train. So are the manufacturing costs for the pulling device less than in previously known solutions.

Due to the simple mechanical structure of the pulling device also results Increased reliability, availability and ease of maintenance of the system.

The linear drives have a very high dynamic, which makes it achievable that the slide already after a very short time its maximum pulling speed achieved, which is significantly higher than that of conventional systems. The loss times remain so low.

In the drawing, an embodiment of the invention is shown. The only FIG. 1 shows schematically the structure of a pulling device, with which portions of the to be drawn Guts be made with desired length of a coil.

In the figure, a pulling device 1 can be seen in the finishing area of a Processing plant for endless good is arranged. The pulling device 1 has a drawing tool 2, through the material to be pulled 3 in a withdrawal direction R. is pulled.

The material to be pulled 3 is first - wound into a coil - on an unwinding device 9 arranged. This is essentially a role which is electrically driven, allowing a sheet of desired length to be pulled Guts 3 is handled by the coil. These are - shown only very schematically - Means 10 provided to influence the unwinding speed of the coil.

The unwound from the coil to be pulled Good 3 passes over a straightening roller set 14 to the drawing tool 2. In withdrawal direction R behind the pulling tool 2 is a Pulling 4 arranged on a straight track 5 between a starting position 11 and an end position 12 can be moved back and forth. This is a Linear drive 8 is provided, which is shown only very schematically in the figure. It is a drive that works on the principle of an electric Linear motor is executed. Such a linear drive is known in the art such well known.

By means of the pulling device 1, sections 7 are made of material 3 to be drawn, wherein the individual sections 7 with a defined length L by means of a stationary arranged cutting device 6 (saw) are generated.

For this purpose, the drawing carriage 4 is first moved to the start position 11, whereby the linear drive 8 is driven accordingly. With a not shown Gripper is a tensile force transmitting connection between the drawing slide. 4 and to be pulled Good 3 in stripping R just behind the drawing tool. 2 produced.

Once this is done, the drawing carriage 4 by means of the linear drive 8 of the Starting position 11 moved to the end position 12. The distance L between the two Positions 11, 12 corresponds to the length of the individual sections 7 that produce it applies.

If the end position 12 is reached, by appropriate discharge of not gripper shown the tensile force transmitting connection between the slide 4 and good 3 solved again. The drawing carriage 4 can by means of the linear drive 8 are moved back to its starting position 11, where again the tensile force transmitting connection between the slide 4 and Good 3 is produced. By repeating this process, a desired number of sections 7 manufactured.

During release of the traction transferring connection in the final position 12 and / or during the backward movement of the drawing carriage 4 from the end position 12 in the start position 11 and / or during the production of the tensile force transmitting connection between the drawing slide 4 and 3 Good in the starting position 11 is sufficient time for the Ablängvorrichtung 6 to - arranged stationary - the Section 7 to be separated Good 3 to separate. So it does not require that the cutting device 6 on the drawing carriage mitfährt, so "flying" formed is.

To achieve a high removal speed, as the linear drive 8 per It must be ensured that the material wound to the coil 3 is not curious what the linear movement from the start position 11 to the end position 12 of the slide carriage 4 would hinder. For this reason, the Means 10 for influencing the unwinding speed of the unwinding device 9 so controlled that immediately before the sliding movement of the Start position 11 in the end position 12 a compensation sheet 13 sufficient length results. Ideally, the arc length of the compensation sheet 13 is at least that large, as is the distance L between the start position 11 and the end position 12 equivalent.

The compensating sheet 13 can be between the unwinding device 9 and the Drawing tool 4 are formed so that at any time a sufficient Reserve on to be pulled Good 3 is present, so that a clamping of the estate. 3 between unwinding device 9 and pulling tool 2 reliably excluded is.

In summary, it can be said that the proposed pulling device has only a single drawing slide 4, with which the good to be pulled third is pulled discontinuously. In this case, the stroke of the drawing carriage 4 corresponds to desired length L of the individual sections 7 of the material to be drawn 3, wherein the separation of individual sections 7 in the outlet region of the pulling device. 1 takes place by a stationary arranged Ablängvorrichtung 6.

LIST OF REFERENCE NUMBERS

1

puller

2

drawing tool

3

good to be pulled

4

drawing carriage

5

straight course

6

Cutting device

7

section

8th

linear actuator

9

unwinding

10

Means for influencing the unwinding speed

11

starting position

12

end position

13

balance sheet

14

roll set

R

stripping

L

Distance, length

Claims (10)

Drawing device (1), in particular for processing metal rods, pipes and semi-finished products, comprising: a pulling tool (2) through which the material to be drawn (3) is pulled, a drawing carriage (4), which can pull the product to be pulled (3) along a straight path (5) in the stripping direction (R) behind the drawing tool (2), as well as a cutting device (6) by means of which individual sections (7) of defined length (L) can be cut off from the article (3) to be pulled, characterized in that
only a single drawing slide (4) is provided, which is moved by means of a linear drive (8). Drawing device according to claim 1,
characterized in that the linear drive (8) is designed according to the principle of an electric linear motor. Drawing device according to claim 1 or 2,
characterized in that the linear drive (8) can cover a linear displacement path (L) which corresponds at least to the largest dimension of the length (L) of the desired sections (7) of the product to be drawn (3). Drawing device according to one of claims 1 to 3,
characterized in that the cutting device (6) is arranged stationary. Drawing device according to one of claims 1 to 4,
characterized in that in the withdrawal direction (R) in front of the drawing tool (2) an unwinding device (9) for a coil of the material to be drawn (3) is arranged. Drawing device according to claim 5,
characterized in that the unwinding device (9) has controllable or controllable means (10) for influencing the unwinding speed. Method for operating a drawing device (1), in particular for processing metal rods, pipes and semi-finished products, the drawing device (1) having a drawing tool (2) through which the material to be drawn (3) is pulled, a drawing carriage ( 4), in pull-off direction (R) behind the drawing tool (2) pulls the material to be pulled (3) along a straight path (5), and a cutting device (6), with the of the material to be pulled (3) individual sections (7) can be cut off, in particular for operating a device according to one of claims 1 to 6,
characterized in that
it has the following steps: a) producing a tensile force transmitting connection between the material to be pulled (3) and the drawing slide (4) at a start position (11) in the withdrawal direction (R) behind the drawing tool (2); b) moving the drawing carriage (4) by means of a linear drive (8) in the withdrawal direction (R) from the starting position (11) to an end position (12); c) releasing the tensile force transmitting connection between the material to be pulled (3) and the drawing slide (4) at the end position (12); d) moving back the drawing carriage (4) by means of the linear drive (8) against the withdrawal direction (R) from the end position (12) to the starting position (11); e) re-establishing a tensile force transmitting connection between the material to be pulled (3) and the drawing slide (4) at the starting position (11); f) repeating steps b) to e) for producing further sections (7) of the product to be drawn (3). Method according to claim 7,
characterized in that the distance (L) between the starting position (11) and the end position (12) corresponds to the length (L) of the desired portions (7) of the product to be drawn (3). Method according to claim 7 or 8,
characterized in that during the steps c) and / or d) and / or e) of claim 7, a cutting of the material to be pulled (3) near the end position (12) by means of the cutting device (6), wherein this is arranged stationary , Method according to one of claims 7 to 9,
characterized in that an unwinding device (9) for a coil of the product to be drawn (3) is controlled or regulated in such a way that an equalizing sheet (13) is formed during steps c) and / or d) and / or e) according to claim 7 whose length substantially corresponds to the length (L) of the desired portions (7) of the product to be drawn (3).

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