DE102017217687A1 - plate stretchers - Google Patents

Abstract

The invention relates to a plate stretcher, in particular for stretching plates made of light metal, comprising an adjusting head (1), a stretching head (2), and at least one master cylinder (5), wherein a plate (3) as a workpiece to be stretched on the one hand on the adjusting head ( 1) and on the other hand on the stretching head (2) can be fixed, wherein by means of the master cylinder (5) a force for stretching the plate (3) on the stretching head (2) is exerted, wherein the stretching head (2) via a coupling (6) releasably connectable to the master cylinder (5) to allow a manipulating stroke (H) of the stretching head (2) relative to the adjusting head (1) for fixing the plate.

Description

The invention relates to a plate stretcher according to the preamble of claim 1 and a method for operating a plate stretcher according to the invention.

DE 1 527 920 A1 describes a plate stretcher in which a sheet metal plate to be stretched is clamped between an adjusting head and a hydraulically powered stretching head. To change the plate, master cylinder on a correspondingly large stroke.

It is the object of the invention to provide a plate stretcher in which a quick change of the plate is made possible.

This object is achieved according to the invention for a Plattenstrecker mentioned above with the characterizing features of claim 1. Due to the releasable fixing of the stretching head to the master cylinder by means of the coupling, a fast movement of the stretching head can be achieved for plate replacement. As a further advantage, stroke and length of the master cylinder can be kept small because the master cylinder is not used for providing the manipulation stroke.

A device according to the invention is preferably used when stretching or stretching light metal plates. Examples are plates of aluminum alloys for aircraft construction. Such devices are large tools in which typical stretching forces range from greater than 10 MN to over 160 MN.

Constructions in which at least one master cylinder is arranged on each side of the stretching head / adjusting head or the plate are generally advantageous. In the horizontal stretching head and / or actuator are conveniently performed on rails in a known manner.

Under a Manipulierhub is understood in the context of the invention, a change in the distance between the control head and stretching head to change the plate or the workpiece. A stretching of the plates by a stretch length is usually at most in the lower percent range of a plate length, so that the Manipulierhub is considerably greater than the stretch length

Generally, it is provided that a pressure column is arranged between the master cylinder and the adjusting head so that the stretching force between the adjusting head and the stretching head is supported by the pressure column. Preferably, the control head can be designed to be displaceable and fixable at different positions on the pressure column. For this purpose, for example, holes may be provided in the pressure column at which the actuating head can be locked by means of bolts. The selectably positioned fixing of the adjusting head serves to set up the plate stretcher to the size of the plate. For regular implementation of a change of plates of the same size would be a movement of the adjusting head too expensive.

By a construction described above, the master cylinder can be easily formed as a solid cylinder with a total circular effective area or not with an annular surface, which reduces the diameter for a given cylinder force. On the master cylinder sweeping feed tubes etc. can be dispensed with.

In a preferred embodiment of the invention, the coupling is designed as a bayonet coupling acting in the axial direction with a rotatable locking ring. The locking ring may be disposed on the stretching head and may be moved by an actuator such as e.g. a hinged cylinder to be rotated by a shutter angle. At one end of a plunger of the master cylinder undercuts can be formed, with which the locking ring in a corresponding rotational position meshed.

Generally preferred is a manipulator for moving the stretching head is provided to the Manipulierhub, which allows a simple automated replacement of the plates.

In a preferred embodiment, the manipulator is releasably connectable to the stretching head. As a result, the manipulator can be separated and removed from the stretching head in the drawing operation, so that in the case of a plate tear, there is no impairment of the manipulator.

In an expedient detailed design of the manipulator comprises a linear actuator, preferably a hydraulic cylinder. Alternatively, it may also be an electromechanical actuator. Furthermore, alternatively, the manipulator may be of any type (storage of the stretch head with driven rollers or the like).

In a preferred embodiment of the invention, in the case of a plate crack, an acceleration of the stretching head is introduced via the coupling into the master cylinder. By a design according to the invention of a plate stretcher, it is particularly easy to catch the large accelerations in the event of a plate crack without high forces being introduced into a foundation of the arrangement.

1. a. Lösen der Kupplung und Wegfahren des Reckkopfes von dem Stellkopf um einen Manipulierhub;
2. b. Wechsel und/oder Positionieren der Platte;
3. c. Zurückfahren des Reckkopfes, Schliessen der Kupplung und Festlegen der Platte an dem Stellkopf und dem Reckkopf; und
4. d. Strecken der Platte durch Druckbeaufschlagung des Hauptzylinders.

The object of the invention is also achieved by a method for operating a plate stretcher according to the invention, comprising the steps:

1. a. Releasing the clutch and driving away the stretching head from the adjusting head to a Manipulierhub;
2. b. Changing and / or positioning the plate;
3. c. Retracting the stretching head, closing the coupling and fixing the plate to the adjusting head and the stretching head; and
4. d. Stretching the plate by pressurizing the master cylinder.

• 1 zeigt eine Draufsicht auf einen erfindungsgemäßen Plattenstrecker in einer geschlossenen Position.
• 2 zeigt den Plattenstrecker aus 1 in einer zum Plattenwechsel geöffneten Position.
• 3 zeigt eine Schnittansicht durch einen Hauptzylinder des Plattenstreckers aus 1.

Hereinafter, a preferred embodiment of the invention will be described and explained in more detail with reference to the accompanying drawings.

• 1 shows a plan view of a Plattenstrecker invention in a closed position.
• 2 shows the plate straightener 1 in a position opened for plate change.
• 3 shows a sectional view through a master cylinder of the plate stretcher 1 ,

The in 1 shown plate straightener has a control head 1 and a stretching head 2 , The heads 1 . 2 can be moved via a rail system (not shown) in the horizontal. A plate 3 can work as a workpiece end to the heads 1 . 2 releasably jammed.

Between the heads 1 . 2 There is one pressure column on each side 4 arranged. The pressure column 4 has rejected recesses 4a where the actuator head 1 by means of closures 1a , For example, by means of bolts, releasably releasably fixed. In this way, a relatively coarse Voreinrichtung the plate stretcher in dependence on the size of the plates to be stretched 3 ,

On the side of the stretching head 2 is at each of the pressure columns 4 a hydraulic master cylinder 5 arranged. The master cylinder is presently designed as a stepped cylinder, with a small, circular effective area in an end region 5a is present and another, annular surface in a central region. These partial surfaces together form an active surface, which corresponds to a full circle according to the inner diameter of the central region.

The stretching head 2 is by means of a lateral coupling 6 with each of the master cylinders 5 releasably connectable. In the connected or locked state, the clutches act 6 parallel to the stretching force in both directions.

The coupling comprises a bayonet closure in the form of a drivable rotatable locking ring 7 (please refer 3 ), which is arranged on the stretching head. After the stretching head 2 starting from a decoupled state (see 2 ) about the master cylinder 5 is brought to pass through the end regions 5a the master cylinder 5 shaped sleeves 8th of the stretching head 2 , At the recordings 8th are each supporting in the direction of force bearings 9 and the lock ring 7 arranged. On the one of the shots 8th overlapped wall of the end areas 5a the master cylinder 5 corresponding undercuts are provided with which the locking ring is intermeshed after rotation about a closure angle to produce an axial positive fit. A release of the couplings 6 takes place in the reverse order.

When pressurized, the master cylinder 5 moved to the right as shown in the figures. The moving parts are in this case the cylinder walls, while the inner parts or pistons 5b rigid with the pressure columns 4 are connected.

If in operation a plate 3 should tear, so experiences the stretching head 2 a strong acceleration from the actuator head 1 away, according to the figures to the right. These forces are from the clutches 6 about her lock rings 7 caught and in the master cylinder 5 where they are intercepted by the damping properties of the hydraulic system.

To work in the plates 3 to change the stretching head 2 in the decoupled state by a Manipulierhub H from the main cylinders 5 be moved away. This movement is done by a manipulator 10 completed, which during the stretching of the plate not with the stretching head 2 connected is.

The manipulator 10 includes two linear actuators 11 . 12 in the form of hydraulic cylinders. Each of the cylinders 11 . 12 is via a manipulator coupling in the form of a clamping member 11a . 12a detachable with the stretching head 2 connected.

The invention now works as follows:

First, the clutches 6 solved and the stretching head 2 is from the control head 1 to the Manipulierhub H moved away (in the figures to the right).

Below is the plate 3 changed and / or positioned.

Subsequently, the stretching head 2 by means of the manipulator 10 moved back and the clutches 6 will be closed. The plate 3 becomes by per se known clamping devices on the control head 1 and the stretching head 2 clamped.

The manipulator is preferably simultaneously with the clamping of the stretching head 2 moved away so as not to be damaged in case of a plate crack.

Stretching the plate 3 takes place by pressurizing the master cylinder 5 , After completion of the stretching becomes the manipulator 10 again with the stretching head 2 connected and the above steps are repeated.

LIST OF REFERENCE NUMBERS

1

Deputy head

1a

Lock actuator head

2

Reck head

3

Plate, workpiece

4

pressure column

4a

Recesses for adjusting the head

5

master cylinder

5a

End section of the master cylinder

5b

Piston master cylinder

6

clutch

7

Lock ring on the stretching head

8th

Pictures on the stretching head

9

Bearings on the stretching head

10

manipulator

11

Actuator, hydraulic cylinder

11a

clamping member

12

Actuator, hydraulic cylinder

12a

clamping member

H

Manipulierhub

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 1527920 A1 [0002]

Claims (9)

Plate straightener, in particular for stretching plates made of light metal, comprising an adjusting head (1), a stretching head (2), and at least one master cylinder (5), wherein a plate (3) as a workpiece to be stretched on the one hand on the adjusting head (1) and on the other on the stretching head (2) can be fixed, wherein by means of the master cylinder (5) a force for stretching the plate (3) on the stretching head (2) is exercised, characterized in that the stretching head (2) via a coupling (6) releasably with the master cylinder (5) is connectable to allow a Manipulierhub (H) of the stretching head (2) relative to the adjusting head (1) for fixing the plate. Plate stretcher to Claim 1 , characterized in that between the master cylinder (5) and the adjusting head (1) a pressure column (4) is arranged, wherein the force between the adjusting head (1) and stretching head (2) by the pressure column (4) is supported. Plate stretcher to Claim 2 , characterized in that the adjusting head (1) is designed to be displaceable and at different positions (4a) on the pressure column (4) can be fixed. Plate straightener according to one of the preceding claims, characterized in that the coupling (6) is designed as a bayonet coupling acting in the axial direction with a rotatable locking ring (7). Plate straightener according to one of the preceding claims, characterized in that a manipulator (10) is provided for displacing the stretching head (2) about the manipulating stroke (H). Plate stretcher to Claim 5 , characterized in that the manipulator (10) is detachably connectable to the stretching head (2). Plate stretcher to Claim 5 or 6 , characterized in that the manipulator comprises a linear actuator (11, 12), in particular a hydraulic cylinder. Plate straightener according to one of the preceding claims, characterized in that in the case of a plate crack acceleration of the stretching head (2) via the coupling (6) in the master cylinder (5) is initiated. Method for operating a plate stretcher according to one of the preceding claims, comprising the steps: a. Releasing the clutch (6) and driving away the stretching head (2) from the adjusting head (1) by a Manipulierhub (H); b. Changing and / or positioning the plate (3); c. Retracting the stretching head (2), closing the coupling (6) and fixing the plate (3) on the adjusting head (1) and the stretching head (2); and d. Stretching the plate (3) by pressurizing the master cylinder (5).

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