EP1748853A1

EP1748853A1 - Stamping machine with a motorised rotating/lifting drive

Info

Publication number: EP1748853A1
Application number: EP05747599A
Authority: EP
Inventors: Frank Schmauder
Original assignee: Trumpf Werkzeugmaschinen SE and Co KG
Current assignee: Trumpf Werkzeugmaschinen SE and Co KG
Priority date: 2004-05-27
Filing date: 2005-05-25
Publication date: 2007-02-07
Anticipated expiration: 2025-05-25
Also published as: EP1748853B1; ES2306154T3; CN101035637A; ATE395994T1; US20070101840A1; US20110120281A1; WO2005118175A1; CN100553817C; PL1748853T3; US20090013843A1; JP4705633B2; EP1600223A1; US7427258B2; DE502005004199D1; JP2008500178A

Abstract

The invention relates to a stamping machine with a tool bearing (7) for a stamping tool (6). A rotating/lifting drive (5) serves to move the tool bearing (7) in the direction of a lifting axis (8) and for rotational adjustment of the tool bearing (7) about the lifting axis (8). In order to achieve the above, the rotating/lifting drive (5) comprises coaxial, opposed spindle drives (20, 21) and a drive controller (32). The motor-side spindle drive elements (18, 19) of the spindle drive (20, 21) are connected to separate drive motors (23, 24) and are selectively controlled by the drive controller (32) to rotate in mutually matching rotating directions in common with the relevant tool-side spindle drive elements (14, 15), or in opposed rotational directions relative to the relevant tool-side spindle drive elements (14, 15), about a spindle drive axis (22). The tool-side spindle drive elements (14, 15) are thus coupled for movement in the direction of the spindle drive axis (22) and for rotation about the spindle drive axis (22).

Description

Punching machine with a motorized rotary / lifting drive

The invention relates to a punching machine with a tool storage for a punching tool and with a rotary / lifting drive, by means of which the tool storage in the direction of a lifting axis to the working area of the punching machine back and forth and is rotatable about the lifting axis and the at least one motor-driven and with A spindle drive provided with a drive control comprises spindle drive elements in the form of a drive spindle and a spindle nut mounted thereon, one of which being a spindle drive element on the motor side and the other being a spindle drive on the tool side. is provided, wherein the motor-side spindle drive element by means of a drive motor relative to the tool-side spindle drive element rotatable about a spindle drive axis and thereby the tool-side spindle drive in the direction of the spindle drive axis and the tool storage in the direction of the lifting axis and wherein the tool-side spindle drive member by means of a drive motor rotatable about the spindle drive axis and thereby the tool storage is rotatable about the lifting axis.

A punching machine of the above type is disclosed in JP 04172133 A. In the case of the prior art, a rotary / lifting drive with two electric drive motors is provided for the tool storage of a punching machine. Both drive motors are arranged laterally next to a drive spindle, which in turn runs in the direction of a lifting axis of the tool storage. One of the drive motors is used for punching workpiece machining and is connected for this purpose via a belt drive with a seated on the drive spindle Hubspindelmutter. By driving the thus resulting spindle drive in opposite directions of rotation provided on the tool storage punching tool is moved with work strokes in the direction of the workpiece to be machined and following each stroke with a return stroke in the opposite direction. The second drive motor of the previously known punching machine is used for rotational adjustment of the tool storage or of the punching machine. Tool provided. Via another belt drive, this drive motor is drive-connected to a driver penetrated by the drive spindle. By means of the second drive motor, if necessary, the rotational position of tool storage and punching tool with respect to the lifting axis of the known rotary / lifting drive is changed.

To provide a powerful and yet compact punching machine, the present invention has set itself from the described prior art as the goal.

This object is achieved according to the invention by the punching machine according to claim 1.

In the case of the invention, therefore, a rotary / lifting drive with coaxial but opposite spindle drives is provided, which in turn are driven by separate drive motors. The motor-side spindle drive elements of the counter-rotating spindle drives can thereby be driven either in the same direction of rotation or in opposite directions of rotation. If the directions of rotation coincide with one another, then the motor-side spindle drive elements move jointly with the mutually coupled tool-side spindle drive elements about the spindle drive axis. With corresponding drive control of the counter-rotating spindle drives, in this way se the tool storage or the punching tool with the desired alignment about the lifting axis drehsetzen. To perform the rotational movement of the tool storage and punching tool, the motor outputs of the individual drive motors are available in total. If the motor-side spindle drive elements run in mutually opposite directions, relative rotational movements result between the motor-side spindle drive elements and the associated tool-side spindle drive elements, which in turn cause a displacement of the tool-side spindle drive elements and of the tool support and the punching tool in the direction of the spindle drive axis or the lift axis. As a result of the coupling of the tool-side spindle drive elements complement each other in this case, the torques provided by the drive motors of the individual motor-side spindle drive elements. A correspondingly large force can be exerted in the direction of the lifting axis on the punching tool movably connected to the tool-side spindle drive elements. This large axial force can be used in particular as a punching force for workpiece machining. The engine power to be installed is lower than it would be if using an equally powerful single drive motor. With a corresponding rotational speed of the motor-side spindle drive elements rotating in opposite directions, a rotation-free movement of the tool-side spindle drive elements in the direction of the spindle drive axis and thus a rotation-free movement of the punching tool in the direction of rotation can be achieved. tion of the lifting axis can be generated without requiring a separate rotation for the tool-side spindle drive elements would be required. Alternatively, according to the invention it is also possible to match the speeds of the motor-side spindle drive elements rotating in opposite directions such that a movement of the tool-side spindle drive elements and the punching tool in the direction of the spindle drive or the lift axis and a rotational movement about the spindle drive. or superimpose the stroke axis. With a compact drive can thus be realized with high performance, a plurality of drive functions.

Particular embodiments of the invention according to claim 1 emerge from the dependent claims 2 to 14.

In the case of Erfindungsbauart according to claim 2, the rotational speeds of the motor-side spindle drive elements by means of the drive control of the counter-rotating spindle drives are independently controllable. In this way, the resulting movements of the tool mounting and the punching tool resulting from the rotational movement of the motor-side spindle drive elements can be adapted with great flexibility to the requirements of the respective application. The evidence of the claims 3 to 7 taken in patent punching machines measures apply to the case that the motor-side spindle drive elements of the counter-rotating spindle drives rotate in opposite directions of rotation. This mode of operation of the counter-rotating spindle drives is selected for generating movements of the tool mounting and the punching tool in the direction of the lifting axis, in particular for the execution of working strokes of the punching tool. In this case, the rotational adjustment of the punching tool with respect to the stroke axis may be important. Under certain circumstances, it must be ensured that the punching tool runs with a specific rotational position relative to the lifting axis onto the workpiece to be machined. By means of the drive control of the counter-rotating spindle drives according to the invention, this can be ensured. As shown in claim 3 actual rotational settings of the tool storage with respect to the lifting axis are detected. Depending on the detection result, the rotational speed of at least one motor-side spindle drive element can be controlled and in this way the rotational adjustment of the tool storage can be influenced. It is conceivable, for example, that when starting the oppositely driven motor-side spindle drive elements, a slight change in the rotational position of the tool storage or the punch results that the rotational adjustment of the tool storage or the punching tool but not changed after the startup phase. Is such a change in the rotational adjustment of tool storage and Punching tool for the workpiece machining to be performed without meaning, so it can be maintained. In this case, the rotational speed of the motor-side spindle drive elements reached after the start-up phase is to be kept at a constant value by means of the evaluation and control unit of the drive control. According to claim 4, an adjustment of the punching tool about the lifting axis can be reversed during the movement of the punching tool in the direction of the lifting axis. This circumstance is especially important when punching tools are used with a deviating from the circular cross-sectional shape. In these cases, the rotational position of the punching tool with respect to the lifting axis for the machining result or for the feasibility of punching workpiece machining is of crucial importance. In the case of Erfindungsbauart according to claim 5, the target rotational position of the tool storage or of the punching tool is defined by that rotational adjustment, which is present at the beginning of the drive of the motor-side spindle drive elements in opposite directions of rotation. Evidence of the claims 6 and 7, a rotary braking device is provided for the tool storage in a further embodiment of the invention, which can be designed in particular as an electromotive rotary braking device. By means of this rotary braking device, the desired rotational adjustment of the tool storage can be secured. The rotary brake device supports the counter-rotating spindle drives, which, if appropriately controlled, also have an uncon- wanted to counteract adjustment of the tool storage in the direction of the lifting axis. Since the rotary braking device therefore has to apply only a relatively small force to prevent rotation of the tool storage, it can build small. Regardless of the rotary braking device thus results in a compact design of the rotary / lifting drive according to the invention.

According to claim 8 opposing spindle drives are provided with a uniform translation in a further embodiment of the invention. This unification of the drive components requires a structurally simple construction of the overall arrangement and also simplifies the drive control of the counter-rotating spindle drives.

The invention types according to claims 9 to 11 are characterized by a particularly compact design of the rotary / lifting drive and thus the entire machine. Due to the inventive features of claim 9 results for the rotary / lifting drive relatively small dimensions in the radial direction of the spindle drive axis. Accordingly, the rotary / lifting drive according to claim 10 is relatively small in the direction of the spindle drive axis. Torque motors, as mentioned in claim 11, allow it to transmit even high engine torques without installation space requiring intermediate gear. The one-piece design of the tool-side spindle drive elements according to claim 12 is provided in the interest of minimizing the number of items and thus in the interest of a structurally simple and compact structure of the overall arrangement.

According to the claims 13 and 14, a preferably pneumatic biasing device is provided in the direction of the spindle drive axis for the tool-side spindle drive elements according to the invention punching machines. Such biasing devices increase the life and reliability of the rotary / lifting drive inventive punching machines.

At the rotary / lifting drive occur in particular upon impact of the punching tool on the workpiece, when breaking the punching tool through the workpiece and generally upon reversal of the lifting movement on load change. The biasing device according to the invention counteracts a sudden load change on the rotary / lifting drive. With an appropriate choice of bias results in a less wear causing swelling stress of the spindle drive instead of changing stress.

During the actual punching process, during the loading of the workpiece to be machined by the punching tool within the rotary / lifting drive one of the direction of the executed power stroke opposing force. As soon as the workpiece is penetrated by the punching tool, the punching tool and the components of the rotary / lifting drive connected to it are endeavored to abruptly move in the direction of the working stroke. With an accompanying sudden load change would be connected to the rotary / lifting drive operating condition, which could be controlled or regulated only with relatively great effort.

The invention will be explained in more detail with reference to schematic representations of exemplary embodiments. Show it:

1 shows a punching machine with a first type of electrical rotary / lifting drive for a punching top tool in the partially sectioned side view,

2 shows the rotary / lifting drive according to Fig.l in longitudinal section,

3 shows a second type of electrical rotary / lifting drive for a punching top tool of a punching machine in longitudinal section,

4 shows a third type of electrical rotary / lifting drive for a punching top tool of a punching machine in longitudinal section, Fig. 5 shows a fourth type of electrical rotary / lifting drive for a punching top tool of a punching machine in longitudinal section and

Fig. 6 shows a fifth type of electrical rotary / lifting drive for a punching top tool of a punching machine in longitudinal section.

As shown in FIG. 1, a punching machine 1 has a C-shaped machine frame 2 with an upper frame leg 3 and a lower frame leg.

At the free end of the upper frame leg 3, an electrical rotary / lifting drive 5 is provided for a punch formed as a punch 6. The punch 6 is mounted on a tool bearing 7. By means of the rotary / lifting drive 5, the tool bearing 7 is in common with the punch 6 in the direction of a lifting axis 8 rectilinearly movable and adjustable in the direction of a double arrow 9 about the lifting axis 8. Movements in the direction of the lifting axis 8 are performed by the tool bearing 7 and the punch 6 at work strokes for machining workpieces and at subsequent work strokes return strokes. A rotational adjustment of the tool bearing 7 is made to change the rotational position of the punch 6 with respect to the lifting axis 8. In the workpiece processing, in the example shown in the case of punching processing of sheets not shown in detail, the punch 6 interacts with a punching die, not shown, in the form of a punching die. This is integrated in the usual way in a workpiece table 10, which in turn is mounted on the lower frame leg 4 of the punching machine 1. The required relative to the punch 6 and the punching die in the workpiece machining relative movements of the sheet in question are carried out by means of a housed in a throat space 11 of the machine frame 2 coordinate guide 12 of conventional design.

As can be seen in Fig. 2 in detail, the tool bearing 7 is provided with the punch 6 on a plunger 13. The plunger 13 passes through a first drive spindle 14 and a second drive spindle 15. The drive spindles 14, 15 are designed as hollow spindles. About connecting screws 16, the drive spindles 14, 15 are interconnected. The connecting screws 16 thereby enforce an outer collar 17 of the plunger 13. As a result, the drive spindles 14, 15 with each other and on the plunger 13 effectively fixed on all sides.

A first spindle nut 18 rests on the first drive spindle 14 and a second spindle nut 19 on the second drive spindle 15. Together with the first spindle nut 18, the first drive spindle 14 forms a first spindle drive 20. speaking, a second spindle drive 21, the second drive spindle 15 and the second spindle nut 19. The two spindle drives 20, 21 are designed as opposite, but otherwise identical ball screws. A common spindle drive axle 22 coincides with the lifting axle 8 of the rotary / lifting drive 5.

To drive the first spindle drive 20 is a first electric drive motor 23, for driving the second spindle drive 21, a second electric drive motor 24. In both drive motors 23, 24 are torque motors. A stator 25 of the first electric drive motor 23 and a stator 26 of the second electric drive motor 24 are each attached to a drive housing 27 of the rotary / lifting drive 5. A rotor 28 of the first electric drive motor 23 is gearless connected to the first spindle nut 18, a rotor 29 of the second electric drive motor 24 in a corresponding manner with the second spindle nut 19. Accordingly, the first spindle nut 18 and the second spindle nut 19 motor-side spindle drive elements, the first drive spindle 14 and the second drive spindle 15 tool-side spindle drive elements of the spindle drives 20, 21. The spindle nut 18, the rotor 28 and the stator 25 and the spindle nut 19, the rotor 29th and the stator 26 are each arranged with mutual overlap in the direction of the lifting axis 8 and the spindle drive axis 22. Via conventional rolling ger 30, 31, the spindle drives 20, 21 and the plunger 13 with the tool bearing 7 and the punch 6 rotatably mounted on the drive housing 27 of the rotary / lifting drive 5.

The electric drive motors 23, 24 and via these also the spindle drives 20, 21 are independent of each other and in each case controllable both in their speed or their angle of rotation and in their direction of rotation. Provided for this purpose is a drive control 32, which is shown very schematically in the figures, and which in turn is integrated in the overall numerical control of the punching machine 1. Part of the drive control 32 is an evaluation and control unit 33. This is connected to the electric drive motors 23, 24 and with detection means 34, 35, 36. By means of the detection device 35, the angle of rotation or the rotational speed and the direction of rotation of the first spindle nut 18, by means of the detection device 36 detects the angle of rotation or the rotational speed and the direction of rotation of the second spindle nut 19. All detection devices 34, 35, 36 are of conventional design and each have a stationary element connected to the drive housing 27 and a revolving element connected to the respective rotating component to be monitored. With the help of the drive control 32 different modes of operation of the rotary / lifting drive 5 can be realized.

When punching workpiece machining, the punch 6 is to be moved in the direction of the lifting axis 8 of the rotary / lifting drive 5 against the workpiece to be machined. For this purpose, the spindle drives 20, 21 are driven by means of the electric drive motors 23, 24 at the same speed but in opposite directions of rotation. Due to the opposing rotational movements of the spindle nuts 18, 19 and due to the u.a. rotatable connection of the drive spindles 14, 15 change the latter in the described rotation of the spindle nuts 18, 19 their rotational position with respect to the lifting axis 8 not. Rather, the drive spindles 14, 15 displace together with the plunger 13 and the punching punch 6 mounted thereon exclusively in the direction of the lifting axis 8 and thereby due to the appropriately chosen directions of rotation of the spindle nuts 18, 19 towards the workpiece to be machined. The motor torques respectively provided by the electric drive motors 23, 24 complement each other; in the case of work strokes, a correspondingly high punching force is available on the punch 6.

After in the example shown, the punch 6 has a deviating from the circular cross-sectional shape, the rotational position of the punch 6 is relative to the lifting axis. 8 for the feasibility of workpiece machining or for the machining result of crucial importance. If the punch 6 at initiation of a punching stroke, that is arranged at the beginning of the opposite direction drive the spindle nuts 18, 19 with its target orientation with respect to the lifting axis 8, so care must be taken that this target orientation even when hitting the punch 6 on the workpiece to be machined is given. For this purpose, the rotational adjustment or the angle of rotation of the punch 6 with respect to the lifting axis 8 is monitored with the aid of the detection device 34 during the punching strokes. If the rotational angle recorded by means of the detection device 34 assumes a value other than zero, at least one of the drive motors 23, 24 is speed-controlled by means of the evaluation and control unit 33 so that the desired rotational adjustment of the punch 6 is restored as a result. The rotational speeds or rotational speeds of the drive motors 23, 24 or of the spindle nuts 18, 19 are monitored by means of the detection devices 35, 36. Otherwise, the detection devices 35, 36 serve to control the rotational angles and directions of rotation of the spindle nuts 18, 19 and thus to control the Amount and the direction of the drive spindles 14, 15 and of the punch 6 executed strokes in the direction of the lifting axis. 8 After completion of a punching stroke, a return stroke of the punch 6 is performed by Richtungsumsteuerung the electric drive motors 23, 24. Also for the execution of the return stroke of the punch 6, the electric drive motors 23, 24 and the spindle drives 20, 21 to operate with opposite directions of rotation.

Both in the punching or working strokes as well as in the subsequent to the working strokes return the opposite directions of rotation of the spindle nuts 18, 19 that the Antriebsspindein 14, 15 and with these the plunger 13 and the attached punching temp ^' el 6 their Alignment about the lifting axis 8 at least substantially maintained. At best, slight alignment corrections are required, which are carried out in the manner described above. Both spindle drives 20, 21 thus act as anti-rotation lock for the drive spindles 14, 15. A separate device for preventing rotation is therefore dispensable.

If the orientation of the punch 6 with respect to the lifting axis 8 to be changed, so the electric drive motors 23, 24 and with these the spindle drives 20, 21 to operate with the same direction of rotation. The spindle nuts 18, 19, which rotate in the same direction about the lifting axis 8, take the drive spindles 14, 15 as well as the punch 6 in rotation with them in rotation. The turntable is monitored Position of the punch 6 by means of the detection device 34, via which the achievement of the desired angle of rotation of the punch 6 can be determined. About the evaluation and control unit 33, the rotary drive of the punch 6 is stopped when reaching the desired rotation setting. The rotational position of the punch die 6 associated punching die is also changed if necessary.

It is also conceivable a superposition of linear movements of the punch Stempeis 6 in the direction of the lifting axis 8 and rotational movements of the punch 6 about the lifting axis 8. For this purpose, the spindle drives 20, 21 by means of the electric drive motors 23, 24 with opposite directions of rotation and different from each other To operate rotational speeds or speeds. The direction of rotation of the punch 6 or the drive spindles 14, 15 is determined by the "faster" of the spindle nuts 18, 19. Also in this mode of operation of the rotary / lifting drive 5, the rotational position or the angle of rotation of the punch 6 is monitored by means of the detection device 34 - and if necessary - by changing the speed of at least one of the drive motors 23, 24 controlled.

A rotary / lifting drive 45, as shown in Fig. 3, differs from the rotary / lifting drive 5 of FIG. 2 by the design of Antriebsspindein 54, 55 and their connection Notwithstanding the drive spindles 14, 15 according to FIG. 2, the drive spindles 54, 55, as shown in FIG. 3, form a one-piece structural unit. A plunger 53 is fixed inside the axial receptacle of the drive spindle 54. Incidentally, the rotary / lifting drive 45 coincides with the rotary / lifting drive 5. The drive spindles 54, 55 form as tool-side spindle drive elements together with motor-side spindle drive elements in the form of spindle nuts 58, 59 opposite spindle drives 60, 61. Due to the given constructive and functional matches are otherwise used in FIGS. 2 and 3, the same reference numerals.

Fig. 4 shows a rotary / lifting drive 85 with spindle drives 100, 101, the kinematic reversal of the conditions according to FIGS. 2 and 3 are executed. Thus, in the case of the rotary / lifting drive 85, a first drive spindle 94 with the rotor 28 of the first electric drive motor 23 and a second drive spindle 95 with the rotor 29 of the second electric drive motor 24 are directly connected. A first spindle nut 98 and a second spindle nut 99 are coupled to each other and attached to a provided with the tool bearing 7 and the punch 6 ram 93. Accordingly, in the case of the rotary / lifting drive 85, the motor-side spindle drive elements of the drive spindles 94, 95 and the tool-side spindle drive elements of the spindle nuts 98, 99 forms. Incidentally, the rotary / lifting drive 85 is basically correct in construction and mode of operation with the rotary / lifting drives 5, 45 according to FIGS. 2 and 3 match. Corresponding reference numerals are provided in the figures for corresponding components.

In Fig. 5, a rotary / lifting drive 125 is shown, which largely coincides with the rotary / lifting drive 45 of FIG. 3. Notwithstanding the rotary / lifting drive 45, the rotary / lifting drive 125 on a rotary braking device 126 for the tool storage 7 and the punch 6 on.

The rotary brake device 126 is designed as an electric motor and has a mounted on the drive housing 27 and a stator 127 connected to a plunger 133 rotor 128. The rotary brake device 126 is connected to the drive control of the punching machine 1 in connection.

In the example shown, the rotary braking device 126 is activated during the entire operating period of the rotary / lifting drive 125. Accordingly, the rotary brake device 126 continuously generates a braking force, which is opposite to a rotation of the plunger 133 and the tool bearing 7 and the punch 6 about the lifting axis 8. As a result, the rotary brake device 126 supports the counter-rotating spindle drives 60, 61 in securing the tool mounting 7 or the punching tool. stem spindle 6 against unwanted rotation about the lifting axis 8. If the spindle drives 60, 61 operated to change the rotational position of the tool bearing 7 and the punch 6 in the same direction, the force exerted by the rotary braking device 126 braking force by the electric drive motors 23, 24 to overcome.

Alternatively, it is conceivable that the rotary braking device 126 is activated only in opposite operation of the spindle drives 60, 61. Also, instead of the electromotive rotary braking device 126, a rotary braking device may be provided which generates the force to be exerted on the tool bearing 7 and the punch 6 mechanically, for example by frictional clamping.

Also, a rotary / lifting drive 165, as shown in FIG. 6, largely corresponds to the rotary / lifting drive 45 of FIG. 3. In addition to the components of the rotary / lifting drive 45 is the rotary / lifting drive 165 with an axial biasing device 166th fitted. The axial prestressing device 166 comprises a piston rod 167, which is connected on the one hand to the assembly formed by the drive spindles 54, 55 and which passes through a piston 168 with its opposite axial end and rests on the latter with a radial projection 169. The piston 168 is movable in a cylinder ring 170 provided on the drive housing 27 in the direction of the spindle drive axis 22. leads. The piston rod 167 is rotatable relative to the piston 168 about its longitudinal axis. A formed between the piston 168 and the drive housing 27 and the cylinder ring 170 pressure chamber 171 is filled with air and is sealed by sealing elements 172 against the environment.

In the punching workpiece machining, the assembly of drive spindle 54 and drive spindle 55 moves in the direction of the lifting axis 8 and the spindle drive shaft 22 down. The piston rod 167 connected to the drive spindles 54, 55 carries out a rectified movement, taking the piston 168 with it. As a result, the pending in the pressure chamber 171 air is compressed. About the piston 168 and the piston rod 167, the compressed air cushion in the pressure chamber 171 exerts on the drive spindles 54, 55 and on this on the tool bearing 7 and the punch 6 in the direction of the lifting axis 8 and the spindle drive axis 22 upward force.

When loading the workpiece to be machined by the punch 6 is built in the connected to the punch 6 components of the rotary / lifting drive 165 also in the direction of the lifting axis 8 and the spindle drive shaft 22 upward force. If the punch 6 penetrates the workpiece, then the punch 6 and the components of the rotary / lifting drive 165 connected to it are endeavored. abruptly execute a directed in the direction of the lifting axle 8 and the spindle drive shaft 22 downward movement. Such a sudden movement is prevented by the biasing force exerted by the axial biasing means 166, in particular by the compressed air in the pressure space 171. This simplifies the control or regulation control of the stamped by an extreme load change operating state of the rotary / lifting drive 165 when penetrating the workpiece to be machined by means of the punch 6th

Instead of the closed pressure chamber 171 and a pressure chamber is conceivable, which is in communication with a pressure control device. As alternatives to the air used in the example shown, further pressure media, preferably gaseous type, are possible. Also, the piston rod 167 may serve as part of a rotary braking device of the type described with reference to FIG. 5.

Claims

claims

1. punching machine with a tool storage (7) for a punching tool (6) and with a rotary / lifting drive (5, 45, 85, 125, 165), by means of which the tool bearing (7) in the direction of a lifting axis (8) to the Working range of the punching machine is movable back and forth and about the lifting axis (8) rotatable and the at least one motor-driven and with a drive control (32) provided with spindle drive (20, 21, 60, 61, 100, 101) comprises with spindle drive elements in the form of a Drive spindle and a spindle nut mounted thereon, one of which as a motor-side spindle drive element (18, 19, 58, 59, 94, 95) and the other as a tool-side spindle drive element (14, 15, 54, 55, 98, 99) is provided, wherein the motor-side spindle drive element (18, 19, 58, 59, 94, 95) is rotatable about a spindle drive axis (22) by means of a drive motor (23, 24) relative to the tool-side spindle drive element (14, 15; 54, 55, 98, 99) thereby the tool-side spindle drive element (14, 15; 54, 55; 98, 99) in the direction of the spindle drive axis (22) and the tool bearing (7) in the direction of the lifting axis (8) is movable and wherein the tool-side spindle drive element (14, 15; 54, 55, 98, 99) by means of a drive motor (23, 24) about the spindle drive shaft (22) rotatably and thereby the tool bearing (7) about the lifting axis (8) is drehsetzen, characterized in that coaxial but opposite Spindle drives (20, 21, 60, 61, 100, 101) and a drive control (32) are provided for this purpose, the motor-side spindle drive elements (18, 19, 58, 59, 94, 95) of the counter-rotating spindle drives (20, 21; 60, 61, 100, 101) are in drive connection with separate drive motors (23, 24) and controlled by the drive control (32) by means of the drive motors (23, 24) optionally in mutually coinciding directions of rotation jointly with the associated tool-side spindle drive elements (14 , 15; 54, 55, 98, 99) or in opposite directions of rotation relative to the associated tool-side spindle drive elements (14, 15, 54, 55, 98, 99) are rotatable about the spindle drive axis (22) and wherein the tool-side spindle drive elements (14 , 15, 54, 55, 98, 99) of the counter-rotating spindle drives (20, 21, 60, 61, 100, 101) are coupled together for movement in the direction of the spindle drive axis (22) and for rotation about the spindle drive axis (22) d.

2. Punching machine according to claim 1, characterized in that by means of the drive control (32) of the counter-rotating spindle drives (20, 21; 60, 61; 100, 101) the rotational speeds of the motor-side spindle drive elements (18, 19; 58, 59; 94, 95 ) are independently controllable.

3. Punching machine according to one of the preceding claims, characterized in that the drive control (32) of the counter-rotating spindle drives (20, 21; 60, 61, 100, 101) Erf ssungseinrichtung (34) for detecting an actual rotational adjustment of the tool storage (7 ) with respect to the lifting axis (8) in mutually opposite directions of rotation driven motor-side spindle drive elements (18, 19; 58, 59; 94, 95) and that the detection device (34) for detecting the actual rotational adjustment of the tool storage (7) with an evaluation - And control unit (33) of the drive control is in communication, by means of which the rotational speed of at least one motor-side spindle drive element (18, 19; 58, 59; 94, 95) in dependence on the detected actual rotational adjustment of the tool storage (7) is controllable.

4. Punching machine according to one of the preceding claims, characterized in that by means of the evaluation and control unit (33) of the drive control (32) a detected actual rotational position and a desired rotational position of the tool storage (7) are comparable to each other and in case of deviation of the detected Actual rotary adjustment of the desired rotational adjustment, the rotational speed of at least one motor-side spindle drive element (18, 19; 58, 59, 94, 95) in a the actual rotational adjustment of the tool storage (7) in the setpoint rotational position converting sense is controllable.

5. Punching machine according to one of the preceding claims, characterized in that as a desired rotational adjustment of the tool bearing (7) the initial rotational adjustment of the tool bearing (7) at the beginning of the opposite direction drive the motor-side spindle drive elements (18, 19; 58, 59; 95) is provided and that by means of the evaluation and control unit (33) of the drive control (32) in deviation of the detected actual rotational adjustment of the tool bearing (7) from the initial rotational adjustment, the rotational speed of at least one motor-side spindle drive element (18, 19; 59; 94, 95) in one of the

Actual rotational adjustment of the tool storage (7) is controllable in the initial rotational adjustment direction.

6. Punching machine according to one of the preceding claims, characterized in that for the tool storage (7) in the direction of the lifting axis (8) effective rotary braking device (126) is provided.

7. Punching machine according to one of the preceding claims, characterized in that the rotary braking device (126) for the tool mounting (7) as an electromotive rotary braking device (126) is formed.

8. Punching machine according to one of the preceding claims, characterized in that the counter-rotating spindle drives (20, 21; 60, 61; 100, 101) are formed with a uniform translation.

9. Punching machine according to one of the preceding claims, characterized in that at least one drive motor (23, 24) as an electric motor with a stator (25, 26) and a radially inside the stator (25, 26) arranged rotor (28, 29) is formed and that the motor-side spindle drive element (18, 19; 58, 59; 94, 95) associated with the drive motor (23, 24) is gearless connected to the rotor (28, 29) and cooperatively connected to the rotor (28, 29) about the spindle drive axis (22) is rotatable.

10. Punching machine according to one of the preceding claims, characterized in that at least one motor-side spindle drive element (18, 19; 58, 59; 94, 95) on the one hand and the rotor (28, 29) and / or the stator (25, 26) of the associated drive motor (23, 24) on the other hand with mutual overlap in the direction of the spindle drive axis (22) are arranged.

11. Punching machine according to one of the preceding claims, characterized in that at least one drive motor (23, 24) is designed as a torque motor.

12. Punching machine according to one of the preceding claims, characterized in that the tool-side spindle drive elements (58, 59) form a one-piece structural unit.

13. Punching machine according to one of the preceding claims, characterized in that for the tool-side spindle drive elements (14, 15; 54, 55, 98, 99) in the direction of the spindle drive axis (22) effective axial biasing means (166) is provided by means of a preload force can be generated which counteracts the movement of the tool-side spindle drive elements (14, 15, 54, 55, 98, 99) which is associated with the movement of the tool support (7) towards the working area of the punching machine (1). c

14. Punching machine according to one of the preceding claims, characterized in that the axial prestressing device (166) for the tool-side spindle drive elements (14, 15, 54, 55, 98, 99) is designed as a pneumatic pretensioning device (166).