EP2321119A2

EP2321119A2 - Drive system for a forming press

Info

Publication number: EP2321119A2
Application number: EP09775925A
Authority: EP
Inventors: Uwe Darr
Original assignee: Mueller Weingarten AG
Current assignee: L Schuler GmbH
Priority date: 2008-07-25
Filing date: 2009-06-29
Publication date: 2011-05-18
Anticipated expiration: 2029-06-29
Also published as: EP2321119B8; CN102105298B; US8910569B2; PL2321119T3; US20110126649A1; WO2010009694A3; EP2321119B1; CN102105298A; WO2010009694A2; DE102008034971A1

Abstract

The invention relates to a press drive by means of direct drive modules, wherein a space-saving construction with low height for the press can be achieved.

Description

Drive system of a forming press

description

The invention relates to a drive system of a multi-point forming press with the features of the preamble of claim 1.

State of the art

According to WO 2004/056559 a pressing device with a pressure point is known, in which a directly arranged on the eccentric shaft direct drive in the form of a frequency-controlled three-phase motor controls the movement of the plunger via a connecting rod. An arrangement of this direct drive in the overall structure of the press, especially in large presses with multiple pressure points is not disclosed.

In DE 10 2004 009 256 a mechanical multi-servo press is described with a drive for a press with two pressure points, in which each eccentric for the lifting movement of the plunger associated with one or more servomotors. Another servo press with one or more direct drives, each in the form of a servo motor on a crank mechanism whose crankshaft acts on the plunger via a connecting rod, is known from JP 2000288792.

From EP 1 082 185 a press is known in which the drive of the plunger pulling from below by four, in each case in the guide corners vertically arranged threaded spindles, which are mounted in the table and driven by a servo motor. This essentially headless press allows a low height. The achievable press force and cycle rate of the system is limited by the performance of the threaded spindles. Regardless of the pressing force and the size of the tool clamping surface, this solution always requires four, not inexpensive, drive systems.

A reduced overall height is achieved in a press according to DE 10 2004 052 007 in that the drive of the toggle mechanism mounted in the head piece are arranged laterally next to the head piece vertically in the area of the press stand by the drive modules consisting of a linear motor or rotary servomotor with a downstream linear converter ,

Task and advantage of the invention

The invention has for its object to make a drive system of a multi-point forming press for flexible movement and tilt control of the plunger so that a small spatial extent, especially a low overall height of the press, a high accuracy of the leadership Tappet and with the available torques of servomotors high press forces and stroke rates with reduced gearbox complexity can be achieved.

According to the invention, the object is achieved by a drive system of a multipoint forming press having the features of patent claim 1. Further detailed embodiments are described in claims 2 to 23.

The core idea of the invention is to equip the drive of the plunger by means of direct drive modules, preferably without upstream gear transmission and for a space-saving design with low height of the press, the pressure points of the plunger with the associated direct drive modules laterally next to the tool clamping surface in the vertical plane To arrange drive stands, wherein the direct drive modules, each consisting of servo motor, lifting mechanism and holding brake are aligned coaxially in the press longitudinal axis or in press transverse axis. With the availability of high-performance servo motors, the lifting mechanism can be driven directly without costly upstream gear transmission.

The lifting mechanism is used to transform the rotating drive movement of the servomotor into a linear output movement of the plunger.

In addition to the principle of consisting of an eccentric shaft with operatively connected connecting rod crank mechanism can advantageously be used for a space-saving design, a crank valve, in which the eccentric of the crankshaft is connected to a sliding block, which is guided in a backdrop of the operatively connected to pressure point of the plunger slide. With the use of the crank mechanism, the advantages of the traversed passage of the lower reversal point can be used for a high clock rate, so that the risks of locking against known direct spindle drives, especially at the lower reversal point in the high-power phase with reversing the spindle rotation can be avoided. The activation of the servomotor or motors enables the generation of flexible movement profiles of the plunger. Different lift heights of the plunger can be realized by selecting a 360 ° circulation mode or a <360 ° pendulum mode on the crankshaft.

By each pressure point separately assigned direct drive modules a spatial tilt control of the plunger is possible in two levels. In each pressure point of the plunger an additional spindle drive for height adjustment of the plunger and a pressure pad for the hydraulic overload protection are integrated in a known manner. Depending on the number of direct drive modules, presses with different press force size and extension of the tool clamping surface can be configured.

In addition to the use of two or four direct drive modules arranged in the longitudinal axis of the press four direct drive modules are advantageously used for the arrangement in press transverse axis. In addition, six or eight direct drive modules, in particular in presses with high pressing force conceivable especially in the arrangement in press transverse axis. When aligning the direct drive modules in press longitudinal axis their storage is advantageous in the both sides of the plunger next to the press transverse axis positioned drive stands. In addition, theirs Storage in drive presses positioned to the longitudinal axis of the press is also conceivable.

If the direct drive modules are aligned in the press transverse axis, their storage can in a first case take place in the drive stands aligned on both sides in front of and behind the plunger in the press longitudinal axis. In a second case, the direct drive modules are each positioned in the transverse to the press longitudinal axis aligned drive stands. In all cases, the pressure points of the plunger and the pressure point chairs are arranged laterally next to or in front of and behind the tool clamping surface in the vertical plane of the drive column. The compact design of this storage of direct drive modules in the drive stand allows on the one hand a reduced overall height of the press and on the other hand, the previous limit of the monolithic design of table, stand and drive housing can be moved in the direction of greater lengths of the tool clamping surface. For larger presses, it is possible depending on the pressing force and expansion of the tool clamping surface to apply a hybrid structure of the press frame. In a first case, designed as a monolith drive stand can be clamped to the press table by means of tie rods. Here, the press stand and arranged in the vertical plane drive housing form a unit. In a second case, the press stand and the drive housing, which is likewise arranged in its vertical plane, are separated and clamped together by tie rods to the press table.

During the pressing process, the power flow closes between the upper tool arranged on the plunger and the the lower tool positioned on the press table via the press stand, which at the same time take over the guiding function of the push rod. With the arrangement of the direct drive modules in the vertical plane of the press racks, the elastic deformation of the press racks in the horizontal plane during the pressing operation can be reduced, thereby increasing the accuracy of the guidance of the ram. The more the pressure points are positioned in the region of the line of vertical force flow of the stator, the smaller the horizontal deformation component of the press stand in the direction of the press longitudinal axis and the press transverse axis.

The direct drive modules can be used either as an upper drive with pressure effect or as a sub drive with pulling effect on the pressure points of the ram. In each case, the application in two- or four-point presses is possible, which are preferably synchronized electronically controlled. It is also possible to mechanically synchronize adjacent direct drive modules as a group and, in the case of a four-point press, to electronically synchronize both groups with each other.

In the case of mechanical synchronization in four-point presses, the group is preferably formed by two direct transverse drive modules aligned in the press transverse axis. With mechanical synchronization, the adjacent, coupled via a shaft direct drive modules per group of at least one servomotor are jointly controlled. When used by a servo motor, this can be arranged either on the input side or on the output side of the group or between the direct drive modules. When using two servo motors per group, either both between the direct drive modules or a first Servomotor on the input side and a second output side of the group of direct drive modules are arranged. It is also possible to position a first servo motor on the input side of the group and a second servo motor between the direct drive modules.

In the case of electronic synchronization of all direct drive modules, the servo motors can be arranged either mirror-inverted on the side facing away from the two direct drive modules or sides or a first servo motor on the input side of the group and a second servo motor between the direct drive modules.

To meet the technical and personnel safety requirements, two independently acting non-positive safety brakes can be used as mechanical holding devices. The brakes can each be integrated in the engine or positioned separately on the free shaft end of the crankshaft.

embodiments

The invention will be explained in more detail by exemplary embodiments. The accompanying drawing shows:

Fig.l drive system of a forming press with two, each aligned in the press longitudinal axis electronically synchronized direct drive modules for

top drive

2 drive system of a forming press with two, each aligned in press transverse axis electronically synchronizable direct drive modules for upper drive 4 drive system of a ümformpresse with four, each aligned in press transverse axis electronically synchronizable direct drive modules for top drive in one second embodiment

Fig.5 drive system of a forming press with four, each aligned in press transverse axis electronically synchronizable direct drive modules for upper drive in a third embodiment

6 drive system of a ümformpresse with four, each aligned in the press longitudinal axis electronically synchronizable direct drive modules for

top drive

FIG. 7 Drive system of a forming press with four electronically synchronizable direct drive modules for bottom drive, each aligned in the press longitudinal axis

In the first embodiment, FIG. 1 shows a two-point forming press whose two direct drive modules 2, which are aligned in the press longitudinal axis 1, are connected to the ram 3 as top drive 4. The direct drive module 2 consists in each case of a mounted in the upper part of the drive stator 5 from the monolithic body 6 servo motor 7, crank mechanism 8 and holding device 9, wherein the crank mechanism 8 includes a crankshaft 20 and a sliding block 10 which extends over a Sliding link 11 in the pressure point 12 of the plunger 3 is supported. The pressure points 12, each consisting of a spindle-operated pressure point adjustment 13 and overload protection 14 are positioned on the plunger 3 projecting pressure point chair 15. The pressure point chairs 15 protrude into the door space 16 of the transverse to the press longitudinal axis 1 aligned drive stand 5, which in combination with the short-stroke drive creates a compact press structure, which in particular allows a low overall height.

While in Fig.l the servomotors 7.1, 7.2 are arranged in mirror image respectively on the outer sides of the drive stand 5, they can also be positioned in mirror image on the inner sides of the drive stand 5 between the direct drive modules 2. This space-saving design in press longitudinal axis 1 can be used particularly advantageously when two or more forming presses are arranged one behind the other in press longitudinal axis 1. The servomotors 7 are advantageously designed as a hollow shaft motor 17 and the holding devices 9 as rotational brakes 18 preferably as non-positive safety brakes. According to Fig.l the servomotors 7 and the rotation brakes 18 are positioned separately on the opposite sides of the respective drive stator 5. Moreover, it is also possible to integrate the holding device 9 in the servo motor 7.

The programmable servo motors 7 can produce a synchronous movement of the plunger 3 by electronic coupling on the one hand and on the other hand by a spatial tilt control in two levels a misalignment of the plunger 3 due to the elastic suspension at off-center Balance load or achieve a desired misalignment.

It is also conceivable that both direct drive modules 2 can be controlled jointly by means of a couplable shaft of both servomotors 7.1 _/ 7.2 or by a servomotor 7.

A two-point forming press with the two aligned in press transverse axis 19 direct drive modules 2 for upper drive 4 can be seen in the second embodiment of FIG. Analogous to the first embodiment, the two drive stands 5 are positioned transversely to the longitudinal axis of the press 1 / in whose Torräume 16 the pressure point chairs 15 protrude. The advantage over the first embodiment is essentially that compensate for the transverse drive movement of the two crank mechanisms 8, the transverse drive forces, which increased expenses for mass balance can be avoided. The crank mechanism 8 consists of a directly driven by the servo motor 7 crankshaft 20, which is supported via an operatively connected connecting rod 23 in the pressure point 12 of the plunger 3. In addition, the crankshafts 20 are each connected at the rear end of the shaft to a holding device 9 supported on the drive stand 5. This embodiment can be extended to a four-point forming press by two direct drive modules 2 are arranged one behind the other in press transverse axis 19. In this case, then two, the pressure points 12 respectively associated pressure point chairs 15 protrude into the goal area 16 of aligned in press transverse axis 19 drive stand 5. Here, either each direct drive module 2, a separate servo motor 7 be assigned, or both direct Drive modules 2 are driven together by mechanical coupling of one or two servomotors 7.

In the third embodiment according to FIG. 3, the direct drive modules 2 are aligned in the press transverse axis 19 in a four-point forming press. If the size of the press does not allow a monolithic body as in the preceding embodiments, the direct drive modules 2 shown here are mounted in pairs in drive stands 5, which are clamped to the press table 21 via tie rods 22. The directly to the drive module 2 associated, controllable by the servo motor 7 crank mechanism 8 consists of a operatively connected to the crankshaft 20 connecting rod 23, which is supported in each case in the pressure point 12 of the plunger 3. The pressure points 12 of the four-point drive are positioned on the plunger 3 projecting pressure point chairs 15 which protrude into the door space 16 of the transversely to the press-transverse axis 19 aligned drive stand 5. The two servo motors 7.1, 7.2 are arranged in mirror image on the side facing away from the two direct drive modules 2 sides. It is also conceivable that both direct drive modules 2 can be controlled jointly by means of a couplable shaft of both servomotors 7.1, 7.2 or by a servomotor 7. As a holding device 9 act on two diagonally opposite direct drive modules 2 each have a rotary brake 18, which are arranged in mirror image to the two direct drive modules 2 facing sides. The fourth exemplary embodiment according to FIG. 4 differs from FIG. 3 in that the servomotors 7.1, 7.2 are each arranged in mirror image on the sides facing both direct drive modules 2. Analogous to the third Embodiment is both a mechanical coupling of the two servomotors 7.1, 7.2 and a servo motor 7 for the common drive of the two direct drive modules 2 possible. In a third embodiment of a four-point forming press according to FIG. 5, in each case a first servomotor 7.1 is arranged on the input side and second servomotor 7.2 between the direct drive modules 2 within the group of direct drive modules 2. This arrangement possibility of the servomotors 7 according to FIG. 4 and FIG. 5 offers spatial advantages in particular if several large multipoint presses are positioned in a press line with workpiece flow in the direction of the press transverse axis 19 at a minimized distance from each other. 6 describes the configuration of a four-point forming press with two groups of direct drive modules 2 aligned in the press longitudinal axis 1, which are each mounted in drive housings 27 positioned to the press transverse axis 19. The drive housing 27 are braced via the press stand 28 with the press table 21 by means of tie rods 22. The adjacent in press longitudinal axis 1 press stand 28 are interconnected by a cross-beam 24. The servomotors 7 are arranged in mirror image to each other between the direct drive modules 2, wherein the two adjacent servomotors 7.1 and 7.2 per group are driven in opposite directions to compensate for the lateral forces generated at the associated crank mechanisms 8.

A drive system of a four-point forming press for sub-drive is shown in Fig.7. For this purpose, two out of four direct aligned in the longitudinal axis of the press 1 are each Drive modules 2 stored in a common drive stand 5. The two drive stands 5 are positioned transversely to the press longitudinal axis 1. Compared to the above embodiments with top drive, the application of the pressing force in the crank mechanism 8 acts in the pulling direction at the bottom drive. The pressure points 12 connected to the connecting rods 23 act on the pressure point chairs 15 which are arranged in the upper region of the plunger 3 and protrude into the upper free space of the drive stands 5. With this compact design results in particular a low height of the press system.

All versions have in common that the direct drive modules 2 are arranged in the vertical plane of the drive stand 26. In this case, the drive stand 5 can be connected in one case either monolithic or by means of tie rods 22 to the table 2. In another case, the drive stands 5 are each divided into a drive housing 27 and associated press stand 28, which are connected together by tie rods 22 to the table 2. All direct drive modules 2 are associated with servo motors 7, with which flexible path and speed profiles for the movement of the plunger 3 can be achieved, wherein the desired positions of the plunger 3 are preferably generated by means of guide shaft controlled electronic cams. With regard to the travel profile, it is possible to choose between a 360 ° rotational movement, a reversing movement at an angle of <360 ° with passing through the lower reversal point or a movement at an angle <180 ° with reversing in the region of the lower reversal point. The latter mode of operation may preferably in conjunction with the possible with electronic synchronization of the pressure points 12 tilt control of the plunger. 3 each used in one level in a two-point forming press or in two levels in a four-point forming press.

LIST OF REFERENCE NUMBERS

1 press longitudinal axis

2 direct drive module

3 pestles

4 upper drive

5 drive stands

6 monolithic body

7 servomotor

7.1 first servomotor

7.2 second servomotor

8 crank mechanism

9 holding device

10 sliding block

11 sliding gate

12 pressure point

13 pressure point adjustment

14 Overload protection

15 pressure point chair

16 goal area

17 hollow shaft motor

18 rotation brake

19 press transverse axis

20 crankshaft

21 press table

22 tie rods

23 connecting rods

24 crossbeam

25 pressure point group

26 Vertical level of the drive racks

27 drive housing

28 press stand

Claims

claims

1. drive system of a multi-point forming press for the movement of the plunger (3) whose each pressure point (12) associated crank drive by a servo motor (7) is controllable, characterized in that in press longitudinal axis (1) or press transverse axis ( 19) aligned direct drive modules (2), consisting of servomotors (7), holding devices (9) and crank mechanisms (8) in drive stands (5) are positioned, wherein the pressure points (12) on the ram (3) projecting located Support pressure point chairs (15) projecting into the vertical plane of the drive stand (26).

2. Drive system of a multi-point forming press according to claim 1, characterized in that in the press longitudinal axis (1) aligned direct drive modules (2) in each case to the press transverse axis (19) positioned drive stands (5) are mounted.

3. Drive system of a multi-point forming press according to claim 1, characterized in that in the press transverse axis (19) aligned direct drive modules (2) in each of the press longitudinal axis (1) positioned drive stands (5) are mounted.

4. drive system of a multi-point forming press according to claim 1, characterized in that the direct drive modules (2) aligned with the press transverse axis (19) are each mounted in drive stands (5) positioned to the press transverse axis (19).

5. Drive system of a multi-point forming press according to claim 1, characterized in that in the press longitudinal axis (1) aligned direct drive modules (2) in each case to the press longitudinal axis (1) positioned drive stands (5) are mounted.

6. Drive system of a multipoint Ümformpresse according to claim 1, characterized in that the direct drive module (2) associated crank mechanism (8) consists of a crankshaft (20) on the drive side with the coaxially arranged servo motor (7) and holding means (9 ) and the output side with a connecting rod (23) is operatively connected.

7. drive system of a multi-point forming press according to claim 1, characterized in that the direct drive module (2) associated crank mechanism (8) consists of a crankshaft (20) on the drive side with the coaxially arranged servo motor (7) and holding means (9 ) and the output side via a sliding block (10) with a slotted link (11) is operatively connected.

8. drive system of a multi-point forming press according to claim 1, characterized in that the drive stand (5) monolithically each with the table (6) and, if necessary, via crossbeams (24) are interconnected.

9. drive system of a multi-point forming press according to claim 1, characterized in that the drive stand (5) and these, if necessary, connecting cross members (24) via tie rods (22) to the table (6) are braced.

10. Drive system of a multi-point forming press according to claim 1, characterized in that the drive housing (27) and press stand (28) existing drive stand (5) via tie rods (22) to the table (6) are braced.

11. Drive system of a multipoint forming press according to claim 1, characterized in that at least two direct drive modules (2) are each operatively connected to a holding device (9).

12. Drive system of a multi-point forming press according to claim 1, characterized in that two, a group forming direct drive modules (2) of at least one servomotor (7) are mechanically synchronized jointly controllable.

13. Drive system of a multipoint forming press according to claim 12, characterized in that a servo motor (7) between the direct drive modules (2) is arranged.

14. Drive system of a multipoint forming press according to claim 12, characterized in that a first and a second servo motor (7.1, 7.2) between the direct drive modules (2) is arranged.

15. Drive system of a multipoint Ümformpresse according to claim 12, characterized in that a servo motor (7) on the input side of the group of direct drive modules (2) is arranged.

16. Drive system of a multipoint forming press according to claim 12, characterized in that a first servomotor (7.1) on the input side and a second servomotor (7.2) on the output side of the group of direct drive modules (2) is arranged.

17. Drive system of a multipoint forming press according to claim 12, characterized in that a first servomotor (7.1) on the input side of the group of direct drive modules (2) and second servomotor (7.2) between the direct drive modules (2) is arranged.

18. Drive system of a multi-point forming press according to claim 12, characterized in that the groups of direct drive modules (2) are synchronized with each other electronically.

19. Drive system of a multi-point forming press according to claim 1, characterized in that each of the two, a group forming direct drive modules (2) of at least one servo motor (7) is separately controllable.

20. Drive system of a multipoint forming press according to claim 19, characterized that both servomotors (7.1, 7.2) are arranged in mirror image on the sides facing away from both direct drive modules (2).

21, drive system of a multi-point forming press according to claim 18, characterized in that both servomotors (7.1, 7.2) are arranged in mirror image at the of both direct drive modules (2) facing sides.

22. Drive system of a multipoint Ümformpresse according to claim 18, characterized in that a first servo motor (7.1) on the input side of the group of direct drive modules (2) and a second servo motor (7.2) between the direct drive modules (2) is arranged.

23. Drive system of a multi-point forming press according to claim 18, characterized in that the direct drive modules (2) are synchronized with each other electronically.