EP0901848A1 - Transfer presses with automatic tool change - Google Patents

Abstract

The control system of the press is constituted in such a way that during tool changing, for transfer of the cross beams (66, 67) and/or the tools carried by the cross beams, it causes the rotary drive to pivot the tools into a transfer orientation. It also causes the height adjustment mechanism to lower the carrier rails down to the level of the tool seating units (83, 84).

Description

The invention relates to a multi-station press or a comparable forming machine with the features of Preamble of claim 1.

For multi-station presses or similar Forming machines, especially with transfer presses the tools can be changed. The tools include upper and lower tools arranged in individual press stages, which are used to process sheet metal parts. While the upper tool is held on the press ram the lower tool is on a so-called sliding table mounted, which comes out of the side of the press can be. The upper tool is used to change the tool placed on the lower tool so that with the Sliding table the complete tool is moved out of the multi-station or transfer press.

In addition to the actual tools, the transfer press shows other workpiece-specific facilities. These include parts of the transfer system serves the sheet metal parts from press level to press level to be transported further. The transfer system is e.g. designed as a two-rail transfer. On both sides the press steps extend two mounting rails lengthways through the transfer press. There are carriages on the mounting rails stored between which crossbars are held are. Via drive curves and corresponding transmission means such a lifting / lowering movement becomes and gives the carriage such a forward / backward movement, that the crossbeams have a desired transfer curve run through.

The crossbeams carry means for receiving or Holding and controlled release of workpieces. This Means are, for example, vacuum-operated suction cups which are connected to the Ends of corresponding suction arms are arranged. These sucker assemblies are also known as suction spiders. The arrangement of the suction cups, i.e. the formation of the suction spiders, is tool specific. The suction spiders belong thus to the workpiece-specific tooling that the Tool change must also be changed.

DE 3843975 C1 is a transfer device known for a step press that is horizontal and vertical has moving mounting rails. Between the mounting rails are traverses held by means of the Mounting rails provided in a limited actuator Are pivotable area about their transverse axis. The crossbeams carry a workpiece-specific tooling and are to be exchanged when changing tools. The one in the press stages arranged tools are on sliding tables held, which can be moved out of the side of the press. So-called locking pins are held on the sliding tables, which are height adjustable by means of pressure medium, i.e. are actively trained.

The pins are used to change the tool crossbars to be picked up on the other adjusted, they take up the crossbars and become then lowered again.

Set hydraulically actuated locking pins a pressure medium connection to the sliding table and the Stake pin ahead.

DE 4208205 A1 also describes a device for step presses for changing workpiece holders (tooling) known with passive tooling storage devices gets along. To hand over the crossbeams from the Transfer system to the locking pins is a transfer device provided one in height and lengthwise has adjustable transfer device. This is formed by a vertical pressure cylinder, the Piston rod the receiving device for the crossbeams carries, and its cylinder over a parallelogram power operated on a circular arc Track is arranged adjustable. There are also swivel movements possible.

The transfer device requires additional installation space and also represents an additional construction effort represents.

Based on this, it is an object of the invention to Multi-station press or a comparable forming machine to create, in which the tooling change to simple Way is achieved with little construction.

This task is solved with the multi-station press, which has the features of claim 1.

The multi-station press according to the invention comes without separate handover device for handing over the tooling from the transfer system to tooling fixtures (locking bolts) out. The control device of the multi-station press controls or monitors at least the drive means for Moving the crossbars on a given transfer curve, as well as the additional height adjustment means with which the height of the mounting rails is adjustable. The drive means moves when the transfer device is in operation Carriages mounted on the mounting rails in the direction of transport, i.e. in the longitudinal direction of the press. It also moves the drive means the mounting rails in the vertical direction, so that by superimposing both motion components A transfer curve is created by the crossbars is going through. The additional height adjustment device enables the height of the transfer curve to be set. The control device uses the height adjustment device and the drive means to the cross members with the tooling held on them or the tooling without placing the crossbars on the tooling fixtures. The tooling fixtures are carried by the sliding tables, i.e. you can use the sliding table itself, as well as on the tool stored on the sliding table be attached. A transfer device is not necessary. This enables a space-saving construction of the whole Multi-station press. Passive locking bolts can also be used (Tooling recordings) can be used. This is unnecessary a pressure medium supply to the tooling receptacles would otherwise be associated with additional effort.

The tooling can be rotated in the transfer device held. The transfer device has corresponding Rotary drive means with which the tooling by one Cross axis can be pivoted into different tilt positions can. The rotary drive means are designed so that the tooling is both in a horizontal working position as well as pivoted into a vertical setting position can be. The possible swivel range of the Toolings is therefore at least 90 ° and is preferred significantly larger (e.g. 180 °). This allows different tilting positions near the horizontal position and also in a vertical position become.

The control device controls in addition to the drive means for the transfer curve and the height adjustment device also the rotary drive means around the desired tooling position adjust.

The drive means for the transfer curve is preferred formed by cams, which with the Main drive of the forming machine or multi-station press are connected. The control device can be in its Restrict the tax effect here to the fact that drive means, i.e. to stop the main drive in a position where the crossbeams above the workpiece holders stand. If necessary, the cams also via appropriate coupling and drive means be positioned separately at least when changing tools.

It is both possible to use the cross beam with tooling as well as the tooling carried by the crossbeams to file on the tooling recordings. Are accordingly when changing tooling, coupling agent to be released between the cross beams and mounted on the mounting rails Carriage or between the tooling and the crossbars arranged. The coupling agents are also from the Control device controlled.

The rotary drive means can be used to rotate the tooling be arranged on the carriage. Alternatively, you can the rotary drive means also be part of the crossbeams, so that there is a section of the tooling Crossbars, twisted towards the ends of the crossbars, which are held to the carriage with coupling means are. Here are the rotary drive means in the crossbar integrated.

It is also possible to tooling with rotary drives to provide. E.g. are suction frames on the crossbeams held releasably, via appropriate arch guides and rotary actuators keep suction arms pivotable. This solution has the advantage that the crossbeams when Tooling changes can remain in the transfer system. Are the crossbeams, for example, to save weight? made of expensive material (carbon fiber composite material), do not need for different tooling variants separate crossbars to be held up to what Brings cost savings.

The control device is as far as it is the task the tooling change takes over from the machine control educated. This is, for example, a programmed microprocessor control. The required controls for the rotary drive the height adjustment device and the query, whether the drive means for the transfer curve in the desired position, as well as the transfer if necessary in this position is preferably from a program section of a program implemented in this control rendered. The realization of the Tooling changes can therefore be made using existing ones Hardware components of the multi-station press or forming machine respectively. The solution is also special simple and robust.

Figur 1 eine mehrstufige Umformmaschine (Mehrstationenpresse) mit einer Transfereinrichtung und einer zusätzlichen Höhenverstelleinrichtung in einer aufs äußerste schematisierten Seitenansicht,

Fig. 1a die Höhenverstelleinrichtung der Mehrstationenpresse nach Figur 1, in einer schematisierten Prinzipdarstellung,

Fig. 2 eine Pressenstufe mit einem Schiebetisch und einem darauf gelagerten Werkzeug sowie mit Toolingaufnahmeeinrichtungen und dem zu übergebenden Tooling in unterschiedlichen Übergabepositionen, in vereinfachter Seitenansicht,

Fig. 3 eine Ausführungsform einer Transfereinrichtung mit Quertraversen, die ein drehpositionierbares Tooling tragen, in ausschnittsweiser Darstellung, und

Fig. 3a die Transfereinrichtung in einer im Bereich ihrer Laufwagen quergeschnittenen ausschnittsweisen Darstellung, und

Fig. 4a bis 4d die Quertraverse und das Tooling nach Figur 3, in aufs äußerste schematisierter Seitenansicht, in unterschiedlichen Positionen bei der Toolingübergabe von der Quertraverse an die Toolingaufnahmeeinrichtung.

Exemplary embodiments of the invention are illustrated in the drawing. Show it:

1 shows a multi-stage forming machine (multi-station press) with a transfer device and an additional height adjustment device in an extremely schematic side view,

1a, the height adjustment device of the multi-station press according to Figure 1, in a schematic diagram,

2 shows a press stage with a sliding table and a tool mounted thereon as well as with tooling receiving devices and the tooling to be transferred in different transfer positions, in a simplified side view,

3 shows an embodiment of a transfer device with crossbeams, which carry a rotationally positionable tooling, in a sectional representation, and

3a shows the transfer device in a sectional illustration in cross-section in the area of its carriage, and

4a to 4d the crossbar and the tooling according to FIG. 3, in an extremely schematic side view, in different positions when the tooling is transferred from the crossbar to the tooling receiving device.

Description:

A multi-station press 1 is illustrated in FIG. 1, of their press stages a total of three press stages 2, 3, 4 are illustrated. At every press level belongs a sliding table 5, 6, 7 of a figure 1 only schematically indicated lower tool 8, 9, 10 wearing. The lower tools 8, 9, 10 are each an upper tool 11, 12, 13 assigned to a press ram 14, 15, 16 is held.

Each press ram 14, 15, 16 is in a press frame 17 vertically movable, which in Figure 1 by press stands 18, 19, 20, 21 and a press head 22 is indicated.

The plungers 14, 15, 16 are in a known manner actuated eccentric drives, no longer illustrated, which are driven by a central main shaft.

During the operation of the multi-station press 1 are Workpieces W to be machined in a transport direction T to be transported through the sequence of press stages 2, 3, 4. For this purpose, a transfer device 24 serves as Two-axis transfer is formed. To the transfer facility 24 belong two mutually parallel, in the direction of transport T extending support rails 25, 26 in Direction of transport seen on the right or left side past each ram 14, 15, 16, lengthways through the multi-station press 1 run. Both mounting rails 25, 26 are arranged in a common horizontal plane.

Carriages 27, 28, are on the mounting rails 25, 26 29 mounted longitudinally. The carriages 27, 28, 29 are only arranged schematically in FIG Push rods 31 connected to a drive means, the the positioning of the carriages 27, 28, 29 in the transport direction T serves. This drive means is preferred a cam mechanism, one from the main press drive includes driven cam, which has a cam follower and corresponding transmission levers as well a transmission linkage acts on the push rod 31. While the carriages 27, 28, 29 in the transport direction T are moved, the mounting rails 25, 26 are in the transport direction T immovable.

For moving the carriages 27, 28, 29 in the stroke direction H (vertical direction) is the multi-station press 1 with a lifting device belonging to the transfer device 24 32 provided. The lifting device 32 includes each press stand 18, 19, 20, 21 a vertically displaceable mounted carriage 33, 34, 35, 36 of each via a tab or rod 37, 38, 39, 40 or directly the mounting rail 25 or 26 carries. The vertically movable mounted carriages 33, 34, 35, 36 are each over a threaded spindle 41, 42, 43, 44 with a likewise vertically displaceable slide 46, 47, 48, 49 connected. The on each press stand 18, 19, 20, 21 stored sled and the connections between them are of the same design and are shown in FIG Carriage 33 and 46 illustrated.

The distance between those mounted on a common guide 51 Carriage 33, 46 with each other can be rotated the threaded spindle 41 can be adjusted. The threaded spindle 41 is rotatable on the lower slide 46, however axially immovable. On the top Carriage 33 is the threaded spindle in a rotatably mounted Nut 52 taken, which in turn axially immovable is mounted on the carriage 33. The mother 52 stands non-rotatably via an external toothing with a pinion 53 axially displaceable in connection that on a Sliding shaft 54 sits. These are parallel to the threaded spindle 41 extending sliding shaft 54 is from one Motor 55 driven. By rotating the motor 55 can thus the distance between the two slides 33, 46 be changed in a targeted manner. As by the threaded spindle 41 coupled unit, however, the carriages 33, 46 are vertical freely movable, the pinion 53 then on the Sliding shaft 54 slides.

To adjust the mounting rails 25, 26 during the passage a transfer curve K (FIG. 1) is used with a Corresponding drive 56 cam mechanism 57. This includes one driven by the drive 56 Cam 58 on which a pivot lever 59 as a curve follower is present. The drive 56 can be the main press drive be just as possible that the drive 56 via gearbox and / or coupling means with the Main press drive is connected. Also a separate one Drive is possible, in any case during normal operation the multi-station press 1 a synchronization between the drive of the plunger 14, 15, 16 and the drive 56 takes place.

The pivot lever 59 gives its back and forth Movement via corresponding push rods 61 to angle lifting 62 further, at their other end with a corresponding Tab 63 with the respective upper slide 33 to 36 are connected.

The drive 56 forms with the lifting device 32 and the push rod 31 and the drive device assigned to it a drive means 64, which the carriage 27, 28, 29 on the transfer curve K leads. Between each two carriages (27, 27 ', Fig. 3a), one of which on the transport rail 25 and the other on the transport rail 26 is arranged, is a crossbar 66, 67 arranged, as can be seen, for example, from FIG. 2.

Each crossbar 66, 67 carries one or more Frame 68 on which transverse to the crossbar 66, 67 suction arms 69, 70 are arranged. Each suction arm 69, 70 is provided at the end with a sucker 71, 72 which is in the temporary Holding the workpieces W serves. The frames 68 form with the suction arms 69, 70 and the suction cups 71, 72 so-called suction spiders. These are workpiece-specific Tooling, that too when changing tools change is.

In the illustrated in Figures 1 and 2 Embodiments are the cross members 66, 67 by one Transverse axis rotatable between the carriage 27, 28 on the Support rail 25 and the carriage 27 'on the running rail 26, as illustrated in Figure 3a. The Crossbar 66 is on its left-hand side in FIG. 3a End 74 with a controlled coupling device 75 connected to the carriage 27 '. There is a coupling half 75a with the crossbar 66 and another coupling half 75b connected to the carriage 27 '. The Coupling half 75b is rotatably mounted on the carriage 27 '.

The opposite end 77 is also over a releasable coupling 78 is connected to the carriage 27. There is a coupling half 78a with the crossbar and the other coupling half 78b with one of the Carriage 27 connected rotary drive 79 connected. With the crossbar 66 can do this about its transverse axis be positioned.

While the rotary drives 79 a rotary drive device for the suction spiders is formed by the Motors 55 described above and those of them driven threaded spindles 41, 42, 43, 44 a height adjustment device 81 formed. Both the rotary drive 79 and the height adjustment device 81 is independent controllable by the drive means 64. For control serves a control device 82 that is part of the anyway existing electrical machine control can. The control device 82 controls the motors 55 Setting the height of the mounting rails 25, 26 and the Rotary drives 79 for adjusting the angular position. Furthermore the control device 82 controls the drive means 64 or at least queries its position. The control device 82 is designed so that with the help of components of the multi-station press described so far 1 a transfer of the cross members 66, 67 or the Vacuum spinning on tooling trays 83, 84 without help accomplished by transfer device. The one for recording of the tooling provided tooling trays 83, 84 are how emerges from Figure 2, on the sliding tables 5 (6 and 7) intended. They are fixed to the respective by Sliding table 5 (6, 7) fixed stationary vertically protruding bolts (pins) 85, 86 formed. This are purely passive and take over the tooling without any intermediary a transfer device of any kind.

The multi-station press 1 described so far works especially when changing tools and tooling like follows:

To change the tool, the control device 82 checks whether the cross beams 66, 67 above the tooling trays 83, 84 are held. If the position does not match the drive means 64 is actuated so that the Carriages 27, 28, 29 are moved and the crossbeams 66, 67 to stand above the tooling trays 83, 84 come.

In the next step, as indicated in Figure 2 is, the rotary drives 79 controlled so that the Swivel cross members 66, 67 by 90 °. The tilt Suction arms 69, 70 in a more or less vertical position. This is the storage position.

To transfer the tooling to the tooling trays 83, 84, the control device 82 controls the motors 55, the distances via the threaded spindles 41, 42, 43, 44 between the upper carriages 46, 47, 48, 49 and the lower Enlarge carriage 33, 34, 35, 36 so that the Slide the mounting rails 25, 26 down. The Cross members 66, 67 with corresponding openings on the Setting pins 85, 86 removed. The control device 82 now releases the couplings 75, 77, after which the mounting rails 25, 26 by driving the motors 55 up again be driven. The tooling is therefore on the sliding tables 5 (6, 7) and can be removed from the multi-station press 1 can be pulled out.

Alternatively, it is one of those illustrated in FIG different embodiment possible, only the suction spiders on corresponding tooling trays 83, 84 put down, the cross-beam 66 in the transfer device remains. As far as this embodiment with the embodiment described above matches the above description applies accordingly and it the same reference numerals are used. Deviating from the embodiment described above are Crossbeams 66 cannot be rotated on the carriages 27, 27 ' held. On the crossbar 66 is with releasable coupling means 75 ', 77' a corresponding frame 91 is held, who carries suction spiders 93 via rotary drives 92 which the suction cups 71, 72 are held.

The procedure for changing tooling is for this embodiment illustrated in Figures 4a to 4d. During normal operation of the multi-station press 1, the tooling takes the position illustrated in FIG. 4a on. To store the tooling on the tooling tray 84, the rotary drive 92 is actuated, so that the suction spider 93 by the position illustrated in Figure 4b drives through into the position of Figure 4c. For Storage of the tooling on the tooling tray 84 controls the Control device 82 now the motors 55, so that the Crossbar 66 moves down and the frame 91 with the suction spider 93 deposits on the tooling tray 84. Of the Frame 91 is received by the pins 85. The controller 82 then controls the motors 55 µm so that the cross-beam moves up again.

A multi-station press 1 has a transfer device 24 with cross members 66, 67. The transfer facility 24 is set up for automatic tooling change. For this purpose, the cross members 66, 67 or that the tooling held on passive tooling receptacles 83, 84 on the sliding tables 5, 6, 7. this happens without the aid of transfer facilities by the Control device 82 one of the remaining drive means 64 independent height adjustment device for workpiece transfer 81 controlled so that the crossbars up be reduced to the passive tooling receptacles 83, 84.

Claims (12)

Multi-station press (1) or the like. with several work stations (2, 3, 4), which are arranged one behind the other in the direction of transport (T) and which workpieces (W) have to pass through one after the other, with tables (5, 6, 7) which can be moved out of the work stations (2, 3, 4) and which are provided with means for holding tools (8, 9, 10) and carry tooling holders (83, 84), With a transfer device (24) for transporting the workpieces (W) from the work station (2, 3, 4) to the work station, the transfer device (24) having at least two support rails (25, 26) which extend essentially parallel to the transport direction (T). having, with crossbeams (66, 67) which are arranged between the support rails (25, 26) and which carry a tooling with holding means (71, 72) for the controlled holding and releasing of the workpieces (W), allow vertical adjustment of the crossbars (66, 67) with at least one drive means (64) for moving the crossbars (66, 67) on a predetermined transfer curve (K) and with height adjustment means (81), with rotary drive means (79) for the controlled rotation of the holding means (71, 72) about an axis oriented transversely to the transport direction (T), with a control device (82) which is set up to control at least the operation of the height adjustment device (81) and the rotary drive means (79),
characterized, that the control device (82) is designed such that in order to deposit the crossbeams (66, 67) and / or the tooling held by the crossbeams (66, 67) when the tool is changed, the rotary drive means (79) is caused to pivot the tooling into a storage position, and that the height adjustment device (81) is caused to lower the support rails (25, 26) vertically to the position of the tooling holders (83, 84) for the transfer of the crossbeams and / or the tooling to the tooling holders (83, 84). Forming machine according to claim 1, characterized in that can be moved longitudinally on the mounting rails (25, 26) mounted carriages (27, 28, 29) are arranged, each with one end of a crossbar (66, 67) are connected. Forming machine according to claim 2, characterized in that the crossbeams (66, 67) with the carriage (27, 28, 29) via controlled releasable coupling means (75, 77) are connected. Forming machine according to claim 3, characterized in that the coupling means (75, 77) from the control device (82) are controlled. Forming machine according to claim 1, characterized in that the height adjustment device (81) at least one controlled length-adjustable means (41) contains that effectively between the drive means (64) and the mounting rails (25, 26) is arranged. Forming machine according to claim 5, characterized in that the controlled length adjustable means (41) is formed by screw spindles over which the Support rail (25, 26) with vertically slidably mounted Carriage (46, 47, 48, 49) connected by the Drive means (64) according to the transfer curve (K) be moved vertically. Forming machine according to claim 2, characterized in that the drive means (64) through a cam gear (57) is formed, the at least one cam (58) for the vertical component of the transfer curve (K) and at least one other cam for the Transport direction component of the transfer curve (K) as well Curve follower means (59), the curve follower means (59) for the vertical component with the mounting rails (25, 26) and the curve follower for the Transport direction component with the carriages (27, 28, 29) is connected, and that the height adjustment device (81) separately from the drive means (64) and for this purpose, the vertical position of the transfer curve (K). Forming machine according to claim 1, characterized in that the rotary drive means (79) on the carriage (27, 27 ') are arranged rotary drives. Forming machine according to claim 1, characterized in that the rotary drive means (79) on the cross members arranged rotary drives (92). Forming machine according to claim 1, characterized in that the tooling recordings (83, 84) are passively trained are. Forming machine according to claim 1, characterized in that the control device (82) is configured in this way is that the transfer of the tooling from the transfer system (24) to the tooling fixtures (83, 84) directly he follows. Forming machine according to claim 1, characterized in that the control device (82) is part of a machine control and through a corresponding program section is realized.

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