EP0507098A1 - Conveying device of a transfer press for transporting large-sized pieces - Google Patents

Abstract

A conveying device of a transfer press for transporting large-sized pieces is proposed in which pieces arranged at an angle in particular in the tool space are to be changed in their position during the feeding or discharge movement. For this purpose, the cross beams (25 to 28) are constructed so as to be rotatable with regard to their longitudinal axis, the rotary movement being effected by a cam mechanism via a pivoted-lever system driven together. <IMAGE>

Description

The invention relates to a transport device for transporting, in particular, large-area parts, preferably in a large-part step press (GT press) according to the preamble of claim 1.

State of the art:

The transport devices for transporting large parts or double parts consist of two horizontal strokes running in the transport direction, one in and against the transport direction, and a vertical stroke carrying rails on which cross bars attached transversely to the transport direction are attached, for example with suction cups or other grippers, through which the pressed parts are transported from one processing stage to the next one (DE 38 43 975 C1). In such presses, it is sometimes necessary to also large body parts, such as. B. side parts or the like. The workpiece is arranged obliquely in the tool for machining reasons. Due to the inclined position of the workpiece, problems arise when transporting the workpiece in this inclined position, since a much greater transport height has to be overcome due to the inclined position. A large lifting stroke of the cross-beam must be used to avoid a collision with the lower tool or the lay-down or empty step when inserting or removing the workpieces. This has the disadvantage that greater accelerations when lifting and lowering the parts are required and there is less freedom of movement in relation to the upper tool.

In order to be able to reduce the lifting stroke or lowering stroke, the workpieces must be swiveled as horizontally as possible when carrying them in and out of the tool space or from the empty step and when transporting them between the steps, so that the disadvantages mentioned above are eliminated.

From DE 38 43 975 C1, a swivel device for the crossbeams for changing the inclined position, ie for changing the position of the workpieces, has already become known, in which a swivel arm connected to the crossbar is known a servo motor drive is driven. A control is required for such an arrangement, which brings the electrically controlled movements into harmony with the mechanically controlled movements of the mounting rails or the cross members. Such a control is complex and complicated. In addition, placing the large number of drive motors on the associated drive cars requires space and brings about inertia problems.

Advantages of the invention:

The transport device according to the invention with the characterizing features of claim 1 has the advantage that a mechanical and common positive control of the crossbeams to change the inclined position of the workpieces is achieved. In each case, cross beams having the same effect are driven by a common push rod via a swivel mechanism, the overall drive of the cross beams which are longitudinally displaceable on transport vehicles and the drive for rotating the cross beams via the common cam mechanism.

This results in a low-mass and therefore acceleration-unproblematic mechanical overall arrangement, which is also advantageous in terms of control technology from the prior art.

Advantageous and expedient developments of the basic idea specified in the main claim are specified in the subclaims.

The details of the invention and its advantageous embodiment are shown in the drawings and explained in more detail in the following description of the invention.

Fig. 1

eine Seitenansicht eines Teils der GT-Presse mit zwei Bearbeitungsstufen und dazwischenliegender Leerstufe mit in den Bearbeitungsstufen und der Leerstufe angeordneten Werkstücken,

Fig. 2

eine Seitenansicht nach Fig. 1 mit einer zwischen Bearbeitungsstufe und Leerstufe angeordneten Transportstellung des Werkstücks,

Fig. 3

eine Seitenansicht nach Fig. 1 mit einer Darstellung der Verfahrkurven zwischen Bearbeitungsstufe und Leerstufe,

Fig. 4

eine Stirnansicht der Kurvengetriebe zur Steuerung der Bewegungen der Quertraversen als Schnitt B-B in Fig. 2,

Fig. 5

einen Schnitt entlang der Schnittlinie C-C in Fig. 1 durch eine Quertraverse,

Fig. 6

eine Draufsicht auf einen Transportwagen mit Schwenkmechanismus für die Quertraverse gemäß Schnitt E-E in Fig. 7 und

Fig. 7

eine Seitenansicht auf den Transportwagen für die Quertraverse mit Schwenkmechanismus gemäß Schnitt D-D in Fig. 5.

Show it

Fig. 1

2 shows a side view of part of the GT press with two processing stages and an intermediate empty stage with workpieces arranged in the processing stages and the empty stage,

Fig. 2

1 with a transport position of the workpiece arranged between the machining stage and the empty stage,

Fig. 3

2 shows a side view according to FIG. 1 with a representation of the traversing curves between processing stage and empty stage,

Fig. 4

3 shows an end view of the cam mechanism for controlling the movements of the crossbeams as section BB in FIG. 2,

Fig. 5

2 shows a section along the section line CC in FIG. 1 through a crossbar,

Fig. 6

a plan view of a trolley with swivel mechanism for the crossbar according to section EE in Fig. 7 and

Fig. 7

a side view of the trolley for the crossbar with swivel mechanism according to section DD in Fig. 5th

1 to 3 show the first two processing stages with the sliding tables 1, 2, the lower tools 3, 4, the upper tools 5, 6, the rams 7, 8, the press stands 9 to 11 and the head pieces 12, 13. The press stands 10, 11 form the empty stages or intermediate storage stages. In FIGS. 2 and 3, the reference numerals from FIG. 1 have only been shown occasionally to improve clarity.

As can also be seen from FIGS. 1 to 3, two laterally arranged support rails 17, 17a lead through the two press stages and are fastened to guide columns 14 to 16 which are mounted in a vertically movable manner in the empty stages 9 to 11. The vertical movement of the mounting rails 17, 17a is driven via a lever and push rod gear (not shown in more detail) in connection with a cam gear 18, 18a (FIG. 4) in a manner known per se.

Guide rails 17b, 17c are provided on the support rails 17, 17a running longitudinally through which the transport carriages 19 to 24 and 19a to 24a are mounted to be longitudinally movable (see also FIG. 5). "A" describes the medium on the other side of the press.

The transport carriages 21, 21a to 24, 24a are used to transport the crossbeams 25 to 28 connected to them, the crossbeams 25, 26 in FIG. 1 within the processing stages as so-called discharge crossbeams and the crossbeams 27, 28 in the empty stages 10, 11 are referred to as so-called crossbars. The "discharge crossbeams" 25, 26 carry the workpiece out of the machining stage, the "insertion crossbeams" 27, 28 carry the workpiece into the machining stage.

The transport trolleys 19, 19a and 20, 20a additionally shown in FIG. 1 serve only for the additional guidance and stabilization of the push rods to be described.

The transport carriages 21, 21a in the first processing stage (tools 3, 5) and the transport carriages 23, 23a in the second processing stage (tools 4, 6) with the respective discharge crossbeams 25, 26 are each connected to laterally arranged, common push rods 29, 29a attached. In the front part of the first processing stage, the additional transport carriage 20, 20a serves to guide these push rods 29, 29a, which are arranged laterally. The connection of the two push rods 29, 29a with the feed curves 32, 32a of a cam mechanism shown in FIGS. 1 and 4 takes place via a connecting rod 30, 30a arranged laterally as well as downstream roller levers 31, 31a (see FIGS. 1 and 4).

Similarly, the trolleys 22, 22a and 24, 24 a for the crossbars 27, 28 in the two empty stages 10, 11 are also connected to one another via a laterally arranged push rod 33, 33a for a common movement. In the front area of the press, the push rods 33, 33a are in turn guided over the two additional transport carriages 19, 19a. The operative connection to the feed curves 36, 36a in the cam mechanism 58, 58a is in turn carried out via additional connecting rods 34, 34a with roller levers 35, 35a connected downstream.

All discharge crossbeams 25, 26 and all entry crossbeams 27, 28 are accordingly controlled jointly via associated push rods.

The crossbeams 25 to 28, which can be moved by means of transport carriages 21 to 24, are rotatably mounted in the transport carriage by means of a swivel mechanism for rotating the crossbeams about their longitudinal axis. The rotary movement of the crossbeams takes place by means of pivot levers 37, 37a for the crossbeam 25 which can be driven separately on their end faces or by means of pivoting levers 38, 38a for the crossbeam 26.

Likewise, a swivel lever 39, 39a is provided for rotating the crossbar 27 and a swivel lever 40, 40a for rotating the crossbar 28. As can be seen from FIGS. 5 to 7, the swivel mechanism for each crossbeam 25 to 28 consists of a kind of rocker bearing within each transport carriage 21 to 24. For this purpose, the crossbeams 25 to 28 are each provided with a crossbeam 85 and two locking bolts 60 on their respective end faces , 60a connected to a swivel housing 86 which carries the respective swivel levers 37 to 40 or 37a to 40a on its lower side, a central axis 81 being used for mounting the rocker-shaped arrangement (see FIGS. 5 and 6). The pivot lever 37 to 40 and the crossbeams 25 to 28 are supported via the central axis 81 via ball bearings 82. The central axis 81 is mounted in the side walls 83, 83a of the respective transport carriage 21 to 24. The pivot lever system for rotating the crossbar 25 to 28 about its longitudinal axis 84 accordingly essentially consists of the rocker-shaped crossbar 85, to which the crossbar is fastened and which in turn is fastened to the swivel housing 86 via the locking bolts 60, 60a. The swivel housing 86 is extended downwards by the swivel levers 37 to 40 or 37a to 40a and is pivotably or rotatably mounted on the central axis 81 by means of ball bearings 82 in the respective transport carriage.

The two swivel levers 37, 37a for the crossbar 25 and the swivel levers 38, 38a for the crossbar 26 are driven via a common push rod 41 and 41a (see FIGS. 1 and 5). Via the additional guide levers 42, 42a, the push rods 41, 41a are operatively connected to the pivoting curves 47, 47a of the cam mechanism via the connecting rods 43, 43a, the angle levers 44, 44a and the push rods 45, 45a and the roller levers 46, 46a (see. Figures 1 and 4).

Similarly, the swivel levers 39, 39a and 40, 40a for the two cross members 27, 28 in the empty stages 10, 11 are connected to a push rod 48, 48a arranged on the side (see FIGS. 1 and 5). These push rods 48, 48a are in turn in operative connection with the associated pivoting curves 54, 54a of the cam mechanism, which is done via the guide levers 49, 49a, the connecting rods 50, 50a, the angle levers 51, 51a, the push rods 52, 52a and the roller levers 53, 53a he follows.

As previously described, both the transport carriages 21, 23 for the discharge crossbeams 25, 26 are driven jointly via the common push rod 29 and the transport carriages 22, 24 for the entry crossbeams 27, 28 are transported via the common push rod 33 .

Likewise, the associated drive for the rotational movement of the discharge cross members 25, 26 via the associated pivot levers 37, 38 via the common push rod 41 and the drive for the rotational movement of the entry cross members 27, 28 via the associated pivot levers 39, 40 via the push rod 48.

As a result, all movements of the discharge crossbeams can be controlled jointly and all movements of the entry crossbeams can also be controlled separately both in their linear movement and in their rotational movement.

The roller levers 46, 46a shown in FIG. 4 for controlling the push rods 41, 41a and the roller levers 53, 53a for controlling the push rods 48, 48a are connected to the associated pivoting curves 47 via additional pull rods 55 to 55c by piston-cylinder units 56 to 56c , 47a or 54, 54a (see FIG. 1).

The cam mechanism with the swivel curves 47, 54 or 47a, 54a and the feed curves 32, 32a, 36, 36a and the drive curves 18, 18a is mounted in a respective cam housing 57 or 57a and from the press via a flanged gear 58, 58a driven.

The workpieces or blanks are inserted into the tool 3 by a blank loader, not shown. After the forming process, the sheet metal parts 62, 63 lying on the lower tools 3, 4 are removed from the associated discharge crossbeam 25, 26 and transported according to the transport curve 64 to the depositing stages 65, 66 within the press stands or empty stages 10, 11 (see. Fig. 1). During the lifting and in the first part of the transport movement, the discharge crossbeams 25, 26 are pivoted from the inclined position in the processing stage to a horizontal position by the pivoting curves 47, 47a via the levers and drive linkages.

The retraction of the cross members 25, 26 from the laying stage 65, 66 in the press stand area 10, 11 into one Waiting position 67 lying between the processing stage and the empty stage follows the driving curve 68. The discharge cross members 25, 26 remain in the horizontal position (see FIG. 1).

The crossbars 25, 26 are retracted into the tools 3, 4 according to the illustrated driving curve 69. The discharge crossbars 25, 26 swivel back into an inclined position during the lowering movement and in the last part of the horizontal movement, in order to remove the sheet metal parts in the processing stages (Fig. 1).

Analogously, the same process takes place with the transverse cross members 27, 28. These remove the sheet metal parts 70, 71 from the laying stage 65 or 66 in a horizontal position and transport them after the driving curve 72 into the subsequent tool stage 4 or into the one that is no longer shown subsequent tool stage (see Fig. 1). The entry cross members 27, 28 pivot in the lowering movement and in the last part of the transport movement again into an inclined position in order to place the sheet metal part in an inclined position on the lower tool 3, 4. The turning into the inclined position is in turn carried out by the associated pivot levers 39, 39a or 40, 40a, which are operatively connected to the pivot curves 54, 54a via the push rods and levers.

The return crossbars 27, 28 are moved back to the waiting position 73 along the travel curve 74. The crossbars 27, 28, in turn, swivel back into the horizontal position during the lifting movement and in the first part of the transport movement.

The entry into the depositing stages 65, 66 takes place according to the illustrated driving curve 75. The transverse cross members 27, 28 remain in the horizontal position.

If sheet metal parts are manufactured which are to have a horizontal position in the tools, the rotary movements of the crossbeams 25 to 28 can be switched off by reversely acting on the piston-cylinder units 56 to 56c. The crossbeams then remain in a horizontal position.

It is also possible to twist only the transverse cross members 27, 28 or the transverse cross members 25, 26, which is done by appropriately loading the associated piston-cylinder units.

The previously described movements of the boards between the individual stations are shown in more detail in FIGS. 2 and 3. 2 shows a sequence of movements in which the sheet metal part 62 is in a horizontal position between the lower tool 3 and the subsequent depositing stage 65 (travel curve 64). At the same time, the sheet metal part 70 transported out of the depositing stage 65 is transported into a horizontal transport position in the subsequent processing stage with the lower tool 4 (travel curve 72). The sheet metal part 63 is transported to the depositing station 66 on a corresponding driving curve 64.

Fig. 3 shows the subsequent position of the board transport. Here, the sheet metal part 62 is placed in the laying stage 65 in a horizontal position. Likewise, the sheet metal part 70 is from the storage stage 65 in the Subsequent processing stage with tool 4 stored in an inclined position. The rotary movement carried out by the crossmember on the driving curve 72 is indicated by the angle α, the angle beam 87 being parallel to the angle beam 88. The sheet metal part 63 arranged in the processing stage 4 in FIG. 1 is deposited in FIG. 3 on the laying stage 66 in a horizontal position.

The displacement of the push rods 29, 33 with connecting rods 30, 34 connected downstream through the cam mechanism 47, 54 via the push rods 45, 52 with angle levers 44, 51 can be clearly seen from the illustrations in FIGS. 1 to 3.

The invention is not restricted to the exemplary embodiment shown and described. Rather, it also includes all professional and advantageous further developments within the framework of the basic idea of the invention.

Claims (11)

Transport device for transporting, in particular, large-area parts in a large-part step press, in which two, horizontal and vertical movement, through the tool space and the empty steps of the press carrying rails are provided, on which rotatable about their longitudinal axis, longitudinally movable cross beams for the workpiece holder are fastened in steps according to the parts transport step, the rotary movement of the crossbeams being effected by means of pivot levers which can be driven separately on their end faces, characterized in that the crossbeams (25 to 28) are connected to the mounting rails (17) by transport carriages (21 to 24), whereby the swivel mechanism for rotating the crossbeams (25 to 28) is mounted in the transport carriage (21 to 24) and that the transport carriage (21 to 24) via a first push rod arrangement (29, 33; 30, 34;) and the swivel levers (37 to 40 ) for the cross beam rotation via a second push rod arrangement (41, 48; 43, 50) can be driven by an associated cam mechanism (32, 36, 47, 54). Transport device according to claim 1, characterized in that the crossbeam (25 to 28) is connected on its respective end face, preferably by means of locking pins (60), to the respective pivot lever (37 to 40), the pivot lever (37 to 40) in the transport carriage (21 to 24) is rotatably mounted on a central axis (81), and that the pivoting lever (37 to 40) is connected to an associated push rod (41, 48) via a lever arm which preferably extends downward. Transport device according to claim 1 or 2, characterized in that the swivel angle (α) of the swivel lever (37 to 40) for rotating the crossbar (25 to 28) about its longitudinal axis (84) is designed such that in the tool step (3, 4) obliquely arranged workpiece (62, 63) can be pivoted into a horizontal transport position. Transport device according to one or more of claims 1 to 3, characterized in that the control of the transport carriage (21 to 24) for the cross-beam (25 to 28) takes place in this way by means of a push rod (29, 33) and a cam mechanism (32, 36) that the workpiece (62, 63) machined in the tool stage (3, 4) is picked up by a discharge cross-beam (25, 26) entering the tool stage and placed in the next empty stage or placement stage (65, 66) in the transport direction ( Curve 64), preferably during the lifting process and at the beginning of the transport process of the workpiece (62, 63), the crossbar (25, 26) and thus the workpiece (62, 63) is rotated into an approximately horizontal position by means of the pivot mechanism. Transport device according to one or more of the preceding claims 1 to 3, characterized in that the control of the transport carriage (21 to 24) for the cross-beam (25 to 28) takes place by means of a push rod and cam mechanism in such a way that this is done in a storage or empty position (65 , 66) located workpiece (70, 71) is preferably picked up by an entry crossmember (27, 28) and can be moved approximately horizontally into the next, subsequent processing stage (4), the entry crossmember (27, 28) preferably performs an additional rotary movement in the last part of its transport movement and in the lowering movement for converting the workpiece into an inclined position. Transport device according to one or more of the preceding claims, characterized in that the rotary movement for all discharge cross-members (25, 26) and / or the rotary movement for all entry cross-members (27, 28) each have a common, preferably over the entire Press-extending, lateral push rod (41, 48) with downstream cam mechanism (47, 54). Transport device according to claim 6, characterized in that the drive of the push rods (41, 48) for the rotational movement of the cross-members (25 to 28) takes place by means of swivel curves (47, 54) of a cam mechanism, the cross-members (25 to 28) in transport carriages ( 21 to 24) are rotatably mounted and can be rotated by means of swivel levers (37 to 40), the swivel levers being able to be driven via push rods (41, 48), preferably via levers (42, 49) and connecting rods (43, 50), which are operated by means of roller levers ( 31, 35) and by means of an angle lever (44, 51) and by means of additional push rods (45, 52) and roller lever (46, 53) are operatively connected to the swivel curves (47, 54). Transport device according to one or more of the preceding claims, characterized in that all transport carriages (21, 23) for the longitudinal displacement of the discharge cross-members (25, 26) and / or all transport carriages (22, 24) for the longitudinal displacement of the entry cross-members (27, 28) can be driven in each case via a common, lateral push rod (29, 33), preferably extending over the entire press, with downstream cam mechanisms (32, 36). Transport device according to one or more of the preceding claims, characterized in that the rotary movements of the crossbeams (25, 28) can be partially or completely switched off, the associated cam mechanism (47, 47a, 53, 53a) possibly using a piston-cylinder unit (56 ) can be separated from the power flow. Transport device according to one or more of the preceding claims, characterized in that the piston-cylinder units (56 to 56c) can be acted upon in reverse. Transport device according to one or more of the preceding claims, characterized in that in each case only the two piston-cylinder units (56 to 56c) belonging together can be acted upon in reverse.

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