Electromechanical Spindle Drive

Abstract

The invention relates to an electromechanical spindle drive (1) having a housing (13), a motor (2), a rotating element (3) in the form of a spindle nut which is rotated about a rotation axis (4) by the motor (2), a spindle (23) cooperating with the rotating element (3), the thread of the spindle (23) being arranged inside the rotating element (3) and exiting the rotating element (3) at a spindle outlet end (35), and bearings (37, 38, 39) supporting the rotating element (3) rotatably relative to the housing (13), characterized in that at least one, preferably at least two bearings (37) are arranged in the region of the spindle outlet end (35) of the rotating element (3) and / or are provided in the form of radial bearings.

Description

[Technical Field]

[0001] The present invention relates to an electromechanical spindle drive according to the preamble of claim 1. The invention also relates to a spindle drive component set, a forming machine and a method for forming a workpiece. [Background technology]

[0002] Various types of forming machines, in particular bending machines, are known from the prior art. In most cases, a hydraulic press drive is used, the operation of which triggers the working movement of one or more forming tools. Braking devices are provided to increase the safety of the machine, in particular to protect the workers.

[0003] In a completely different field, U.S. Patent No. 5,623,666 discloses an electrically operated linear actuator in the form of a spindle drive, in which a motor drives a drive shaft within a drive housing through a transmission. A braking device is also provided, including a first clutch disc that is axially movable and a second clutch disc that cooperates with the drive shaft via a hub. The first clutch disc presses the second clutch disc against a third clutch disc. By activating a coil, the first clutch disc moves to a disengaged position, allowing the second clutch disc to rotate with the drive shaft.

[0004] Patent document 2 similarly discloses a braking device that includes a motor, a rotating brake disc, and a fixed brake disc in association with a linear actuator that serves as a driving source, and the fixed brake disc is movable relative to the rotating brake disc, enabling braking of the drive shaft by friction.

[0005] Disadvantages arising from the prior art include, inter alia, that the drive devices and their operation disclosed therein are not suitable for applications in forming workpieces, in particular for forming processes that must be performed precisely and reproducibly. It is also mentioned that the braking action, in particular the braking torque or braking force, is too low for certain applications. In this case, the braking process, i.e., the time that elapses between the actuation of the brake device and the braking action (e.g., stopping the drive or braking to the desired level), is often too long.

[0006] The main disadvantage of spindle drives known from the prior art is that they require a very large amount of installation space, which often precludes their use in applications where installation space is critical. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] European Patent Application Publication No. 1524455(A2) [Patent Document 2] European Patent Application Publication No. 2333380(A1) Summary of the Invention [Problem to be solved by the invention]

[0008] The object of the present invention was to overcome the drawbacks of the prior art and to provide a spindle drive which is highly reliable and ensures a space-saving design, in particular ensuring a reliable transmission of forces or movements to the spindle via a rotating element.

[0009] In a variant, a method for shaping a workpiece is also provided, which, on the one hand, achieves a direct and immediate action of the forming tools on the workpiece and, on the other hand, increases the efficiency and precision of workpiece shaping. Furthermore, the respective action of the forming tools is made as clear as possible, in particular with regard to the magnitude of the applied force and / or the duration of the force action. It also makes it possible to reduce the time required for shaping the workpiece, especially when the shaping process consists of several sub-steps. In a preferred embodiment, the efficiency of the braking action and of the application of the braking process or braking torque is also increased. [Means for solving the problem]

[0010] This object is achieved by a spindle drive of the type mentioned at the outset in that at least one, preferably at least two bearings are arranged in the region of the spindle outlet end of the rotating element and / or are configured in the form of radial bearings, which improve the bearing support of the rotating element.

[0011] A preferred embodiment is characterized in that at least one bearing arranged in the region of the spindle outlet end of the rotating element is arranged inside the rotating element, preferably inside the rotating element. This measure allows the required installation space, especially the dimension perpendicular to the rotation axis, to be significantly reduced. In this case, the space already present inside the rotating element is utilized for the bearing.

[0012] A preferred embodiment is characterized in that at least one bearing arranged in the region of the spindle outlet end of the rotating element is arranged between the inside of the rotating element and a bearing seat projecting into the inside of the rotating element, the bearing seat being preferably formed in a housing part of the housing, preferably in the front housing cover, thereby ensuring a secure holding of the bearing and preferably allowing the housing part to be used for the bearing, which further reduces installation space and weight.

[0013] A preferred embodiment is characterized in that at least one bearing arranged in the region of the spindle outlet end of the rotating element is arranged axially overlapping the stator and / or rotor of the motor and / or in the region surrounded by the stator and / or rotor of the motor. This measure also reduces the axial dimension of the spindle drive, since the bearing is not axially adjacent to the motor but axially overlaps it. In other words, the bearing and the motor (stator and / or rotor) are at least partially located at the same axial height.

[0014] A preferred embodiment is characterized in that at least one bearing arranged in the region of the spindle outlet end of the rolling element is a rolling bearing, in particular a ball bearing.

[0015] A preferred embodiment is characterized in that at least one bearing, preferably a radial bearing, is arranged in the region of the end of the rolling element opposite to the spindle outlet end.

[0016] A preferred embodiment is characterized in that at least one bearing is an axial bearing, preferably arranged in the area between the motor and the brake of the electromechanical spindle drive, which reduces the required installation space since the axial bearing is arranged in an area where space is already available.

[0017] Preferred embodiments are characterized in that the stator of the motor surrounds the rotating element and / or the rotor of the motor surrounds pole elements, preferably in the form of permanent magnets, which are preferably removably attached to the outside of the rotating element and / or the motor is a synchronous motor.

[0018] A preferred embodiment is characterized in that the spindle drive is a rolling spindle drive in which rolling elements, in particular in the form of balls, are guided in a recirculating path, a first part of which is formed between the internal thread of the rolling element and the external thread of the spindle, and a second part of which is formed by a return path, which is formed inside the spindle. By arranging the return path inside the spindle, the wall of the rolling element (which would normally have to accommodate the return path) can be made thinner, which likewise saves space.

[0019] A preferred embodiment is characterized in that a mounting element is connected to the rotating element at the end opposite the spindle outlet end of the rotating element, the mounting element preferably having a portion located inside the rotating element and / or forming a stop for the spindle. The mounting element is non-rotatably (by form-fit and / or frictional engagement), preferably rigidly connected to the rotating element, and therefore rotates together with the rotating element. The mounting element can perform various functions, such as a cover, an interface for supplying lubricant to the inside of the rotating element, a link to a sensor device, etc., as required.

[0020] A preferred embodiment is characterized in that the part of the mounting element that is external to the rotating element is formed in the form of a pin, the longitudinal axis of which coincides with the rotation axis of the rotating element, and preferably the maximum diameter of the part of the mounting element that is located inside the rotating element is at least three times, preferably at least four times the diameter of the pin. The pin can lead through other structures and / or components (sensor devices, braking devices, etc.) to, for example, a lubrication connection.

[0021] A preferred embodiment is characterized in that the spindle drive device has a sensor device, and the part of the mounting element that is outside the rotating element is within the detection range of the sensor device, preferably the sensor device being a rotation sensor that detects the rotation of the mounting element.

[0022] A preferred embodiment is characterized in that a lubricant passage is formed in the mounting element for supplying lubricant to the interior of the rotating element.

[0023] A preferred embodiment is characterized in that the path of the first part of the lubricant passage is coincident with the rotation axis of the rotating element, preferably through a part of the mounting element that is external to the rotating element, and the first part may end in a lubricant inlet connected to a (lubricant) supply line or supply device.

[0024] A preferred embodiment is characterized in that the course of the second part of the lubricant passage has a radial component relative to the axis of rotation and / or is inclined relative to the axis of rotation, preferably passing through a part of the mounting element located inside the rotating element and / or terminating in an outlet (inside the rotating element) arranged in the peripheral region of the mounting element relative to the axis of rotation. The lubricant serves to lubricate the internal thread of the rotating element and the external thread of the spindle, and possibly the rolling elements arranged between them.

[0025] A preferred embodiment is characterized in that the mounting element is surrounded by the brake device of the spindle drive, preferably in a central recess of the brake disc of the brake device and / or forms a preferably form-fitting receiving space for the brake disc of the brake device, so that the mounting element can be used for centering and / or positioning the brake disc.

[0026] A preferred embodiment is characterized in that cooling fins are arranged on the outside of the housing, at least in the area of ​​the motor, and preferably the cooling fins are removable from the housing body.

[0027] A preferred embodiment is characterized in that the spindle drive is constructed modularly.

[0028] The spindle drive has a brake device operable between a brake position and a release position, the brake device acts on the rotating element, and the brake device is preferably arranged in the region of the end of the rotating element opposite to the spindle outlet end.

[0029] A preferred embodiment is characterized in that the braking device comprises a brake disc which rotates together with the rotating element and an axially movable braking element which acts on the brake disc in the braking position.

[0030] A preferred embodiment is where the brake disc An inner region; a friction surface area extending annularly about the axis of rotation, the friction surface area including a first friction surface formed on a first side of the brake disc; an intermediate region extending between the friction surface region and the inner region about the axis of rotation; A first opposing surface is formed on the braking element, facing the first friction surface and cooperating with the first friction surface in the braking position.

[0031] The braking element does not rotate together with the rotating element. In other words, the braking element is stationary relative to the rotation of the rotating element or the brake disc rotationally connected to the rotating element. In the braking position, the braking element exerts a braking action by frictional engagement with the brake disc. According to an embodiment of the invention, the friction surface area is located radially outside the inner area and also outside the intermediate area. The inner area can serve as a fixing area (for fixing to the rotating element), while the intermediate area is preferably designed to be deformable. It is preferred that the inner and intermediate areas do not come into contact with the braking element even in the braking position. The braking action is highest in the peripheral area, where, on the one hand, the speed is greatest and, on the other hand, the greatest braking torque can be generated.

[0032] The braking element is movable axially from a released position to a braking position, which movement reduces the braking gap until the braking element presses its first opposing surface against the first friction surface of the brake disc.

[0033] The braking torque is transmitted to the rotating element via the regions located further radially inward (the inner region and the intermediate region).

[0034] The brake disc can be fixed axially relative to the rotating element at its inner area. In the braking position, the brake element presses against the friction surface area located further outwards, which exerts a deformation force on the brake disc, which tends to bend axially.

[0035] The rotating element can be, for example, a drive shaft, a screw nut (such as in a spindle drive), a rotor (of an electric motor), or any rotating element of a drivetrain.

[0036] A preferred embodiment is characterized in that the intermediate region of the brake disc is free from contact with the braking element in both the released and braking positions and / or that in the braking position the contact between the braking element and the brake disc is limited to the first friction surface. In this way, frictional engagement only occurs in the region of the friction surface, while the inner and intermediate regions are not in direct contact with the braking element. In this way, the intermediate region in particular can perform additional functions.

[0037] A preferred embodiment is characterized in that the intermediate region is a deformation region that can be elastically deformed in the axial direction by the braking element acting on the brake disc. Unlike known solutions, the brake disc can here be axially fixed to the rotating element. In general, a rigid connection can be provided between the brake disc and the rotating element. This increases the braking action, and in particular the braking force is transmitted directly to the rotating element.

[0038] A preferred embodiment is characterized in that the deformation zone is provided with cutouts, preferably in the form of through holes, and / or weakened areas of the material. The number of cutouts determines the degree of deformability and can be optimized for different application areas. Alternatively, the deformation zone can be characterized by a reduced material thickness compared to the inner zone and / or the friction surface zone.

[0039] A preferred embodiment is characterized in that the total area of ​​the cutouts in the deformation area is at least as large as the total area occupied by the remaining material, which ensures sufficient deformation, especially when the friction surface area is pressed against the second counter surface in the braking position.

[0040] A preferred embodiment is characterized in that the friction surface area has a second friction surface formed on a second side of the brake disc opposite the first side, and the friction surface area of ​​the brake disc is arranged between a first counter surface and a second counter surface facing the second friction surface and cooperating with the second friction surface in the braking position. In the released position of the brake device, a braking gap is formed between the respective cooperating surfaces. The deformable intermediate area ensures that the braking gap is completely closed by axial deformation of the brake disc, as an alternative to the brake disc being axially displaceable relative to the rotating element.

[0041] A preferred embodiment is characterized in that the first opposing surface is annular and / or the second opposing surface is annular.

[0042] A preferred embodiment is characterized in that the friction surface areas are arranged on the periphery of the brake disc, preferably the first friction surface and / or the second friction surface reaching the outer edge of the brake disc, as already mentioned above, the braking effect is greatest in the outermost areas of the brake disc.

[0043] A preferred embodiment is characterized in that the difference between the outer and inner radii of the friction surface area is at most 1 / 3, preferably at most 1 / 4, of the outer radius of the brake disc.

[0044] A preferred embodiment is characterized in that the electromechanical drive has a housing, and the second opposing surface is formed on a housing part or on an element rigidly connected to the housing part. This measure allows the braking torque to be introduced directly into the (stationary) housing. The braking energy released in the form of heat can also be transferred into the housing, thereby allowing the heat to be dissipated directly through the housing, thereby eliminating costly braking cooling.

[0045] A preferred embodiment is characterized in that the inner area of ​​the brake disc has at least one, preferably several, preferably annularly arranged, mounting interfaces, preferably in the form of holes, for fastening the brake disc to the rotating element, preferably the number of mounting interfaces being greater than 10 and / or greater than the number of cutouts in the deformation area. A rigid connection between the brake disc and the rotating element is particularly preferred here, which is for example fastened by means of screws.

[0046] A preferred embodiment is characterized in that the first friction surface and the first counter surface deviate from a parallel position in the release position of the brake device, and / or the second friction surface and the second counter surface deviate from a parallel position in the release position of the brake device. This measure allows, for example, a reduction in pressure in the more inner part of the friction surface area, while increasing pressure in the more outer part. This allows a more even pressure distribution to be achieved if the friction surface or counter surface (or braking gap) is dimensioned accordingly. This results in less wear and a longer service life. These advantages can also be achieved, for example, by the following preferred embodiments.

[0047] A preferred embodiment is the radial spacing between the first friction surface and the first counter surface is reduced, preferably this spacing being at most 1 mm, preferably at most 0.2 mm, smaller at the radially outer edge of the first friction surface than at the radially inner edge of the first friction surface; and / or the radial spacing between the second friction surface and the second counter surface is reduced, preferably characterized in that this spacing is at most 1 mm, preferably at most 0.2 mm, smaller at the radially outer edge of the second friction surface than at the radially inner edge of the second friction surface. Secondly, in the braking position, the pressure decreases in the more inwardly positioned portions of the friction surface area, whereas it increases in the more outwardly positioned portions, which further allows for some accommodation of the braking disc bending axially during the braking process.

[0048] A preferred embodiment is characterized in that in the release position of the braking device the first friction surface and the first counter surface are inclined relative to one another and / or in that in the release position of the braking device the second friction surface and the second counter surface are inclined relative to one another.

[0049] A preferred embodiment is characterized in that the first friction surface and / or the first counter surface has a radially curved profile and / or the second friction surface and / or the second counter surface has a radially curved profile.

[0050] A preferred embodiment is characterized in that the inner area of ​​the brake disc is axially fixed to the rotating element and / or the inner area of ​​the brake disc is rigidly connected to the rotating element, preferably via a screw.

[0051] A preferred embodiment is characterized in that a first spacer ring is arranged between the inner area of ​​the brake disc and the rotating element, and the inner area of ​​the brake disc is preferably fastened between the first and second spacer rings, preferably by screws. The spacer ring can be used to adjust or optimize the relative position of the friction surface with respect to the counter surface. Furthermore, the spacer ring ensures an even pressure distribution.

[0052] A preferred embodiment is characterized in that the electromechanical drive is a spindle drive and the rotating element connected to the brake disk is formed in the form of a threaded nut which cooperates with the spindle of the spindle drive.

[0053] A preferred embodiment is characterized in that the brake disc has a disk-shaped base body and that the first friction surface and / or the second friction surface are preferably formed by annular brake pads, which are attached to the base body and / or protrude axially beyond the base body.

[0054] A preferred embodiment is characterized in that the braking element is biased towards the braking position, which can therefore be maintained by a passive (spring) element independently of operation or energisation.

[0055] A preferred embodiment is characterized in that the braking element is biased towards the braking position by a plurality of springs arranged annularly, preferably overlapping the first opposing surface.

[0056] A preferred embodiment is characterized in that the spring is inserted into a removable housing part of the electromechanical drive.

[0057] A preferred embodiment is characterized in that the braking device has an actuator, preferably in the form of an electromagnet, controllable by the control device, by means of which the braking element can be put into the release position and / or the braking position, the actuator being preferably inserted into a removable housing part of the electromechanical drive. Such a variant has the advantage that in the event of a power failure or a control error, the electromagnet is de-energized and the braking device automatically goes into the braking position.

[0058] A preferred embodiment is characterized in that the braking device is integrated into the electromechanical drive and / or the motor and braking device are accommodated in a common housing, which increases the directness of the braking action, since braking takes place in the area where the motor torque is generated directly.

[0059] The present invention also relates to a spindle drive component set including a plurality of components for an electromechanical spindle drive according to the present invention, wherein the component set includes components of different types, and the components have connection interfaces for connecting the components to each other, and the components of the same type have different sizes, and the connection interfaces of the components of the same type and different sizes are designed with the same dimensions. This approach allows the spindle drive to be easily adapted to given requirements. In this case, size, output, force, (spindle) stroke, weight, and cooling capacity can be appropriately used as criteria for selecting and assembling desired components into the spindle drive according to the present invention. Here, the connection interfaces can be mechanical interfaces (fixing points or fixing mechanisms) for housing parts, rotating elements, spindles, motor parts (e.g., a variable number of pole elements provided on the rotating elements), etc., electrical interfaces and control-related interfaces for, for example, motors, braking devices, and / or sensor devices, hydraulic interfaces, or fluid supply interfaces (lubricants).

[0060] In a preferred embodiment, the component set comprises: a first housing portion having a different length and / or width; a second housing portion having a different length and / or width; The connection interfaces for connecting the first housing parts with the second housing parts are characterized in that they are designed with the same dimensions for all first housing parts and all second housing parts, so that the housing parts can be connected to other housing parts regardless of their sizes.

[0061] In a preferred embodiment, the component set comprises: Rotating elements of different lengths and / or widths; housing portions of different lengths and / or widths and motors of different lengths and / or widths; the connection interfaces of the rotating elements for connection with the housing parts and / or the motor are designed with the same dimensions for all rotating elements; and / or characterized in that the connection interfaces for connecting the housing parts and / or motors with the rotating elements are designed with the same dimensions for all housing parts and / or motors.

[0062] The invention also relates to a forming machine, in particular a bending machine, for forming preferably plate-shaped workpieces, The molding machine is at least one electromechanical spindle drive; and at least one forming tool having a working motion performed by an electromechanical spindle drive.

[0063] The invention also relates to a method for forming a preferably plate-shaped workpiece using a forming machine, in particular a bending machine, according to the invention, in which the motor of an electromechanical spindle drive for forming the workpiece is controlled by a control device.

[0064] In a preferred method for forming a preferably plate-shaped workpiece using a forming machine, in particular a bending machine, the forming machine comprises: at least one electromechanical drive (spindle drive) with an electric drive source (motor); at least one forming tool whose working movement is caused by an electromechanical drive; and at least one braking device operable between a release position and a braking position for braking and / or preventing working movement of the forming tool. Such an embodiment may include: and / or the forming tool is started by the electric drive generating a drive torque while the brake device is in a braking position before the operating phase of the forming tool, so that the braking torque of the brake device opposes the driving torque of the electric drive, and the brake device moves to a released position and / or a position with reduced braking torque; and / or The working movement of the forming tools is intermittent during the forming process.

[0065] The workpiece to be formed is preferably a metal plate-shaped workpiece, in particular a sheet, and the forming machine is therefore preferably a sheet forming machine, such as a bending press or a swivel bending machine.

[0066] The method is controlled by a control device, which controls the electric drive on the one hand and the brake on the other hand, and by means of which the operation steps, in particular their initiation and / or sequence, can be controlled. The control device therefore activates the electric drive and the brake according to the method, thereby controlling the drive torque (of the drive) and the brake torque (of the brake), whereby the drive and the brake act directly or indirectly on the forming tool.

[0067] For example, the controller may store an operating mode corresponding to the method (eg, in addition to other operating modes).

[0068] By means of this embodiment measure, the working movement of the forming tool can be divided into individual movement phases, between which the forming tool is stopped or slowed down, the division into individual movement phases being effected by a braking device, i.e. the working movement can be controlled by a braking device.

[0069] This embodiment has two important advantages. According to a first variant, the braking device serves to initiate an operating phase. This means that the braking device assumes a control function that relates not (only) to braking or stopping the work operation, but also to initiating or releasing the operation. This type of control can be used not only for single operating phases, but also in particular for intermittent (e.g. hammering) work operations with several interrupted operating phases. Here, the braking device assumes the function of controlling the progression of the operating phases.

[0070] The great advantage of this concept is that the drive torque of the drive source does not have to be generated until the beginning of the operating phase (and thus the beginning of the workpiece machining phase) but is already available. The brake device quickly shifts to its release position, so that the already available drive torque acts directly on the forming tool and thus on the workpiece. This results in a defined work step, which is also introduced by a pulse or impulse that is defined in terms of time and acting force and is always precisely reproducible.

[0071] Another advantage is that the cooperation of the electric drive and the operable braking device makes it possible for the first time to sequentially control the operating phases of the intermittent operation. Here too, the method is controlled by a control device, which controls the electric drive on the one hand and the braking device on the other hand, and can thereby control the operating phases of the intermittent operation, in particular their initiation and / or sequence.

[0072] The braking device includes an actuator connected to a control system of the molding machine that controls the actuator to move the braking device between a released position and a braked position.

[0073] The braking device is preferably a friction brake, which allows particularly fast transitions between the braking position and the release position to be achieved, so that the activation phase and the phase between activation phases can each preferably be less than 1.5 seconds, more preferably less than 1 second.

[0074] A preferred embodiment is characterized in that the direction of movement of the forming tool does not change during the individual working steps of the intermittent working operation and / or the distance traveled by the forming tool during the intermittent working operation is a composite of the distances traveled during the individual working steps of the intermittent working operation. This is a gradual movement of the forming tool. In this case, for example, a bending process can be achieved by individual partial steps. Here, the (repeated) impact movement of the forming tool can generate the required forming force.

[0075] A preferred embodiment is characterized in that the working movement of the forming tool during the forming process comprises a plurality of, preferably at least three, movement stages, which are interrupted by stages in which the forming tool is stationary or moves slower than the movement stages, preferably the length of each individual movement stage being less than 3 seconds, preferably less than 1.5 seconds, and / or preferably the length of each stage in which the forming tool is stationary or moves slower than the movement stages being less than 3 seconds, preferably less than 1.5 seconds.

[0076] A preferred embodiment is characterized in that the intermittent working movement of the forming tool is caused by intermittent operation of a braking device between a release position and a braking position, whereby the braking device assumes the control function, thereby ensuring a precise and well-defined machining of the workpiece.

[0077] A preferred embodiment is characterized in that the electric drive source generates a drive torque during the phases in which the brake device is in the braking position during intermittent operation of the brake device, where the drive source does not necessarily have to generate a drive torque again, which would involve repeated reaction times at the start of each operating phase.

[0078] A preferred embodiment is characterized in that the drive torque of the motor is kept substantially constant during the forming process with intermittent working movements of the forming tools, thereby minimizing the control costs for the drive source, while control is exercised via the braking device.

[0079] A preferred embodiment is characterized in that the electromechanical drive comprises a rotating element, a braking device acts on the rotating element, and preferably the electric drive source is formed by a motor which exerts a driving torque on the rotating element, whereby simple and efficient braking devices such as friction braking and powerful driving devices such as motors can be used.

[0080] A preferred embodiment is characterized in that during the phases of intermittent operation of the braking device in which the braking device is in the braking position, the braking torque acting on the rotating element is higher than the drive torque acting on the rotating element, by which measure the movement of the forming tool can be stopped between the individual operating phases.

[0081] A preferred embodiment is characterized in that the electromechanical drive comprises a transmission mechanism, in particular a linear gear, which converts the rotation of a rotary element into a linear movement of a transmission element which acts directly or indirectly on the forming tool.

[0082] A preferred embodiment is characterized in that the braking device is integrated into the electromechanical drive and / or the electric drive and the braking device are accommodated in the same housing.

[0083] The invention also relates to a forming machine, in particular a bending machine, for forming preferably plate-shaped workpieces, which machine comprises: at least one electromechanical drive unit having an electric drive source; at least one forming tool whose working movement is caused by an electromechanical drive; at least one braking device operable between a release position and a braking position to brake and / or prevent working movement of the forming tool; 1. A molding machine including an electric drive source and a control device for controlling a braking device, The control device stores operating modes that allow the electric drive and braking device to be controlled as follows: prior to the operating phase of the forming tool, the electric drive source generates a driving torque while the brake device is in a braking position, so that the braking torque of the brake device opposes the driving torque of the electric drive source, and the operating phase of the forming tool is initiated by moving the brake device to a released position and / or a position with reduced braking torque; and / or characterized in that the working movement of the forming tool is performed intermittently during the forming process.

[0084] The forming machine is preferably a bending machine and can be designed, for example, as a bending press, in particular a brake press, or a swivel bending machine.

[0085] Such a molding machine may include a first (e.g., upper) tool carrier and a second (e.g., lower) tool carrier, the relative movement of which is the working movement, where, for example, one tool carrier may be stationary and the other tool carrier may be movable by an electric drive.

[0086] At least one electric drive of the forming machine acts on a tool carrier, preferably an upper tool carrier, which holds the forming tools.

[0087] A preferred embodiment is characterized in that the electromechanical drive comprises a rotating element, the braking device acts on the rotating element, and preferably the electric drive source is formed by a motor, which exerts a drive torque on the rotating element.

[0088] The following embodiments also aim to increase the efficiency of braking action and the braking process or braking torque generation, thereby increasing safety, especially in applications where personnel work or operate in hazardous areas and therefore the drive must be stopped immediately under certain conditions. Improved braking systems increase the reliability, performance, and usability of electromechanical drives in a wide variety of applications.

[0089] A preferred embodiment of the molding device is characterized in that the control device storing the operating mode is configured to operate the molding machine according to the method, in particular according to any one of the above-mentioned embodiments, by controlling the electric drive source and the braking device.

[0090] A preferred embodiment of the method is characterized in that the molding machine is designed according to the invention, in particular according to any one of the above-described embodiments.

[0091] The above-mentioned object is also achieved by a forming machine, particularly a bending machine, preferably a bending press, equipped with at least one drive for the work operation, particularly a press drive, where the at least one drive is an electromechanical drive. Such a forming machine can include a first (e.g., upper) tool carrier and a second (e.g., lower) tool carrier, the relative movement of which is the work operation. The above-mentioned electromechanical drive is particularly suitable for use in forming machines because the proposed braking device reacts particularly quickly, thereby reliably protecting personnel (especially when shutting down or stopping / slowing down the work operation is important for safety) and "protecting" the workpiece from incorrect or erroneous machining routines.

[0092] For a better understanding of the invention, a more detailed description will now be given with reference to the following figures.

[0093] The drawings are each highly simplified and schematic representations. [Brief explanation of the drawings]

[0094] [Figure 1] FIG. 1 is a cross-sectional view of an electromechanical drive device. [Figure 2] FIG. 2 is a perspective view of a portion of the braking device. [Figure 3] FIG. 3 is a cross-sectional view of the braking device. [Figure 4] FIG. 4 is a cross-sectional view of a brake disc. [Figure 5] FIG. 5 shows the cooperation of the braking element and the braking disc. [Figure 6] FIG. 6 shows the braking device in the released position. [Figure 7] FIG. 7 shows the braking device in the released position. [Figure 8] FIG. 8 shows the braking device with the second braking surface and the opposing surface in the released position. [Figure 9] FIG. 9 shows the braking device with the second braking surface and the opposing surface in the released position. [Figure 10]FIG. 10 shows a braking device with a biased braking element. [Figure 11] FIG. 11 shows a housing portion including a spring receiving portion and an actuator receiving portion. [Figure 12] FIG. 12 shows a forming machine in the form of a bending press with an electromechanical drive. [Figure 13] FIG. 13 shows a control device with an electromechanical drive. [Figure 14] FIG. 14 is a diagram showing the transition over time of the driving torque of the driving source and the braking torque of the braking device in the first embodiment. [Figure 15] FIG. 15 is a diagram showing the transition over time of the (substantially constant) driving torque of the driving source and the (intermittent) braking torque of the braking device during intermittent work operation in the second embodiment. [Figure 16] FIG. 16 is a diagram showing the transition over time of the (intermittent) driving torque and the (intermittent) braking torque during an intermittent work operation in the third embodiment. [Figure 17] FIG. 17 shows the distance traveled by the forming tool during the forming process. [Figure 18] FIG. 18 shows the attachment element relative to the rotating element. DETAILED DESCRIPTION OF THE INVENTION

[0095] It should be noted at the outset that the same elements in the different embodiments described are given the same reference numerals or element names. In this case, the disclosure contained in the entire description applies mutatis mutandis to the same elements having the same reference numerals or element names. Positional terms selected in the description, such as top, bottom, side, etc., also refer to the displayed figures directly described, and these positional terms also apply mutatis mutandis to the new positions if the positions change.

[0096] The examples show possible embodiments, and it is to be noted here that the invention is not limited to the specifically illustrated embodiments, but on the contrary, the individual embodiments can also be combined with one another in various ways, and this variation is within the capabilities of a person skilled in the art based on the teachings of the present invention regarding the technical operations.

[0097] The scope of protection is defined by the claims. However, the detailed description and the drawings must be taken into account in order to interpret the claims. Individual features or combinations of features described in the different embodiments shown and described may constitute independent inventive solutions in themselves. The problems underlying these independent inventive solutions can be read from this description.

[0098] In the specific description, all references to ranges of values ​​should be understood to include any and all subranges based on that reference, such as a reference 1 to 10, which should be understood to include all subranges from a lower limit of 1 to an upper limit of 10. That is, all subranges begin at a lower limit of 1 or more and end at an upper limit of 10 or less, such as 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

[0099] Finally, as a matter of formality, in order to make the structure easier to understand, some elements have been represented not to scale and / or enlarged and / or reduced.

[0100] 1 shows an electromechanical spindle drive 1, which includes a housing 13, a motor 2, and a rotating element 3, which can be rotated about a rotation axis 4 by the motor 2. The rotating element 3 is designed in the form of a spindle nut. A spindle 23 cooperates with the rotating element 3. The thread (external thread) of the spindle 23 is arranged inside the rotating element 3 and cooperates there, preferably via a rolling element 45, with the internal thread of the rotating element 3, which is designed as a spindle nut. The spindle 23 exits the rotating element 3 at a spindle outlet end 35.

[0101] The motor 2 has a stator 2a (e.g. in the form of windings) supported, e.g. inside the housing 13, and a rotor 2b (e.g. in the form of permanent magnets) connected to and / or arranged directly on the rotating element 3. The stator 2a of the motor 2 suitably surrounds the rotating element 3. The rotor 2b of the motor 2 may include pole elements, preferably in the form of permanent magnets, attached, preferably removably, to the outside of the rotating element 3. The motor 2 is suitably a synchronous motor.

[0102] The spindle drive 1 also has bearings 37 , 38 , 39 that support the rotating element 3 for rotation relative to the housing 13 .

[0103] As can be seen in Figure 1, at least one, preferably at least two, of the bearings 37 are arranged in the region of the spindle outlet end 35 of the rolling element 3 and / or are designed in the form of a radial bearing, which is preferably a rolling bearing, in particular a ball bearing.

[0104] 1, at least one bearing 37 arranged in the region of the spindle outlet end 35 of the rolling element 3 is arranged inside the rolling element 3, here on the inside of the rolling element 3. This bearing 37 is located between the inside of the rolling element 3 and a bearing seat 36 formed in the housing part 13c of the housing 13, preferably in the end housing cover, which projects into the interior of the rolling element 3.

[0105] 1, at least one bearing 37 arranged in the region of the spindle outlet end 35 of the rotating element 3 is arranged axially overlapping with the stator 2a and / or rotor 2b of the motor 2. In other words, the bearing 37 is arranged in the region surrounded by the stator 2a and / or rotor 2b of the motor 2.

[0106] A radial bearing 39 is arranged on the end of the rotating element 3 opposite the spindle outlet end 35, by means of which the rotating element is supported relative to the housing part 13a.

[0107] An axial bearing 38 may also be provided, preferably in the area between the motor 2 and the brake device 5 .

[0108] In the embodiment shown, the electromechanical spindle drive 1 further comprises a brake device 5 operable between a brake position and a release position, which is arranged in the region of the end of the rotating element 3 opposite the spindle outlet end 35. The brake device 5 comprises a brake disk 6 which rotates together with the rotating element 3 and an axially movable brake element 7 which acts on the brake disk 6 in the brake position (see also Figures 2 and 3).

[0109] As can be seen from FIG. 4, the brake disc 6 an inner region 8; a friction surface area 10 extending annularly around the rotation axis 4 and provided with a first friction surface 11, formed on a first side of the brake disc 6; an intermediate region 9 passing between the friction surface region 10 and the inner region 8 about the rotation axis 4; It can have:

[0110] The braking element 7 is formed with a first counter surface 17 facing the first friction surface 11 and cooperating with the first friction surface 11 in the braking position.

[0111] The motor 2 and the brake device 5 are preferably housed in a common housing 13 .

[0112] In the preferred embodiment shown, the intermediate region 9 of the brake disc 6 does not come into contact with the brake element 7, either in the released or braking position. In the braking position, contact between the brake element 7 and the brake disc 6 is limited to the first friction surface 11 (see Figures 2, 7 and 9). As can be seen for example in Figure 5, the region of the brake element 7 that interfaces with the first counter surface 17 can be set back behind the counter surface 17.

[0113] In the preferred embodiment of the brake disc 6 shown in FIG. 4, the intermediate region 9 is a deformation region that is elastically deformable in the axial direction by the action of the brake elements 7 on the brake disc 6 (see FIGS. 7 and 9).

[0114] The deformation zone may be provided with cut-outs 19, preferably in the form of through holes, and / or weakened areas of the material, as shown in Figure 4. It is preferred that the total area of ​​the cut-outs 19 in the deformation zone is at least as large as the total area occupied by the remaining material.

[0115] While the embodiment according to Figures 5 to 7 only has a first friction surface and a counter surface, the variants of Figures 1 to 3 and 8 and 9 show that the friction surface area 10 can also have a second friction surface 12 formed on a second side of the brake disc 6 opposite to the first side. The friction surface area 10 of the brake disc 6 is arranged between a first counter surface 17 and a second counter surface 18 facing the second friction surface 12 and cooperating with the second friction surface 12 in the braking position.

[0116] The brake disc 6 has a disk-shaped base body 24. The first friction surface 11 or the second friction surface 12, respectively, is formed by a preferably annular brake pad, which is attached to the base body 24 and / or protrudes axially beyond the base body 26 (Figures 5 to 9).

[0117] The first counter surface 17 and the second counter surface 18 are each formed in an annular shape. A plurality of interrupted, for example segmentally arranged, counter surface areas are also conceivable.

[0118] As can be clearly seen in Figure 4, the friction surface area 10 is preferably arranged on the periphery of the brake disc 6, where the first friction surface 11 and / or the second friction surface 12 can reach the outer edge of the brake disc 6. The difference between the outer and inner radius of the friction surface area 10 is expediently at most 1 / 3, preferably at most 1 / 4, of the outer radius of the brake disc 6.

[0119] 1 and 3 show that the electromechanical spindle drive 1 has a (multi-part) housing 13. Here, the second counter surface 18 can be formed on the housing part 13a or on an element that is rigidly connected to the housing part 13a. In this way, the braking torque and the resulting frictional heat can be introduced directly into the housing.

[0120] In the embodiment shown in Figure 4, the inner region 8 of the brake disc 6 has a plurality of mounting interfaces 16, preferably in the form of holes, arranged here in an annular fashion, for fastening the brake disc 6 to the rolling element 3. In this case, the number of mounting interfaces 16 is preferably greater than 10 and / or greater than the number of cutouts 19 in the deformation region. A large number of mounting interfaces allows for a particularly precise adjustment of the brake disc relative to the opposing surface.

[0121] 6 to 9, in the release position of the braking device 5, the first friction surface 11 and the first opposing surface 17 deviate from a parallel position. Similarly, the second friction surface 12 and the second opposing surface 18 may also deviate from a parallel position.

[0122] Preferably, the spacing between the first friction surface 11 and the first counter surface 17 decreases in the radial direction, and preferably this spacing is at most 1 mm, preferably at most 0.2 mm, smaller at the radially outer edge of the first friction surface 11 than at the radially inner edge of the first friction surface 11.

[0123] Similarly, the spacing between the second friction surface 12 and the second counter surface 18 may decrease in the radial direction, preferably this spacing being at most 1 mm, preferably at most 0.2 mm, smaller at the radially outer edge of the second friction surface 12 than at the radially inner end of the second friction surface 12.

[0124] The friction surface and the counter surface may be inclined relative to each other. The friction surface and the counter surface may be curved in the radial direction.

[0125] As can be seen in particular from Figures 1 to 3, the inner region 8 of the brake disc 6 can be axially fixed to the rolling element 3. In the embodiment shown, the inner region 8 of the brake disc 6 is generally rigidly connected to the rolling element 3. This is done by means of screws which pass through holes (mounting interface 16; see Figure 4) and press the brake disc against the rolling element 3.

[0126] In the embodiment of Figure 3, a first spacer ring 14 can be seen arranged between the inner area 8 of the brake disc 6 and the rolling element 3. The inner area 8 of the brake disc 6 is also sandwiched between the first spacer ring 14 and a second spacer ring 15. This is done with the same screws as mentioned above, which rigidly connect the brake disc 7 with the rolling element 3.

[0127] In the preferred variant shown, the electromechanical spindle drive 1 is a spindle drive, and the rotating element 3 connected to the brake disc 6 is designed in the form of a threaded nut which cooperates with the spindle 23 of the spindle drive. The lower end of the spindle 23 moves linearly downwards or upwards along the rotation axis 4 (FIG. 1) when the threaded nut (rotating element 3) is rotated by operating the motor.

[0128] The braking element 7 can be biased towards the braking position. Finally, Figures 10 and 11 show that the braking element 7 is biased towards the braking position by a plurality of springs 21, preferably arranged in an annular fashion overlapping the first opposing surface 17.

[0129] Here, the spring 21 can be inserted into a removable housing part 13b (for example in the form of a cap or end cover) of the electromechanical spindle drive 1.

[0130] As can be seen in Figures 1 to 3 and 10, the braking device 5 includes an actuator 22, preferably in the form of an electromagnet, which is able to move the braking element 6 into a release position and / or a braking position. The actuator 22, like the spring 21, can be inserted into the removable housing part 13b of the electromechanical spindle drive 1.

[0131] As can be seen in Figure 1, the spindle drive 1 can be a rolling spindle drive in which rolling elements 45, in particular in the form of balls, are guided in a circulating path, a first part of which is formed between the internal thread of the rolling element 3 and the external thread of the spindle 23, and a second part of which is formed by the return path 44. In the embodiment shown, the return path 44 is formed inside the spindle 23.

[0132] 1 and 18, at the end of the rotation element 3 opposite the spindle outlet end 35, a mounting element 40 can be connected to the rotation element 3, and preferably the mounting element 40 has a portion located inside the rotation element 3 and / or forms a stop for the spindle 23. The portion 46 of the mounting element 40 located outside the rotation element 3 can be formed in the form of a pin, the longitudinal axis of which coincides with the rotation axis 4 of the rotation element 3. The maximum diameter of the portion of the mounting element 40 located inside the rotation element 3 is suitably at least three times, preferably at least four times, the diameter of the pin-shaped portion 46. The portion 46 of the mounting element 40 located outside the rotation element 3 is within the detection range of a sensor device 47, which is preferably a rotation sensor that detects the rotation of the mounting element 40.

[0133] The mounting element 40 may be formed with a lubricant passage 41 for supplying lubricant to the interior of the rotating element 3. The course of a first portion 42 of the lubricant passage 41 may preferably coincide with the rotation axis 4 of the rotating element 3 at a portion 46 of the mounting element 40 located outside the rotating element 3.

[0134] The course of the second portion 43 of the lubricant passage 41 has a radial component relative to the axis of rotation 4 and / or is inclined relative to the axis of rotation 4 (Figures 1 and 18). The second portion 43 of the lubricant passage 41 runs through a portion of the mounting element 40 that is located within the rotation element 3 or ends in an outlet 48 that is located in the peripheral region of the mounting element 40 relative to the axis of rotation 4.

[0135] In the illustrated embodiment, the mounting element 40 is surrounded by the brake device 5 of the spindle drive 1. Here, the mounting element 40 can be located in a central recess of the brake disc 6 and also forms a preferably form-fitting reception for the brake disc 6, thereby fulfilling a centering function for the brake disc.

[0136] On the outside of the housing 13, at least in the area of ​​the motor 2, (eg removable) cooling fins 49 may be arranged.

[0137] The spindle drive 1 can be configured modularly, thereby providing a spindle drive component set for manufacturing and / or adjusting the spindle drive. Such a component set includes components for a plurality of electromechanical spindle drives 1. The component set includes components of different types, and the components have connection interfaces for connecting the components to each other. Components of the same type have different sizes, and the connection interfaces of components of the same type and different sizes are designed with the same dimensions.

[0138] In one example, the component set is: housing sections of different lengths and / or widths; and housing portions of different lengths and / or widths; The connection interfaces of the first housing parts for connecting with the second housing parts are designed with the same dimensions for all first housing parts and all second housing parts.

[0139] In one example, the component set is: Rotating elements of different lengths and / or widths; housing portions of different lengths and / or widths and motors of different lengths and / or widths; The connection interfaces of the rotating elements for connecting with the housing parts and / or motors are designed with the same dimensions for all rotating elements, and / or the connection interfaces of the housing parts and / or motors for connecting with the rotating elements are designed with the same dimensions for all housing parts and / or motors.

[0140] Finally, FIG. 12 shows a forming machine 20 in the form of a bending press, equipped with at least one drive, in particular a press drive, for the working movement (of the forming tools). This or these drives are designed as an electromechanical spindle drive 1 according to the present invention. Such a forming machine may include a first (e.g., upper) tool carrier 25 (for holding at least one first forming tool 28) and a second (e.g., lower) tool carrier 26 (for holding at least one second forming tool 29), the collective movement of which is the working movement. Here, as shown in FIG. 12, the second tool carrier 26 can be stationary, while the first tool carrier 25 is movable by the drive 1. The electromechanical spindle drive described above is particularly suitable for use in bending machines, since the proposed braking device reacts particularly quickly, thereby reliably protecting personnel (especially when shutting down or stopping / slowing down the working movement is critical for safety) and also "protecting" the workpiece from incorrect or erroneous machining routines.

[0141] Figure 12 shows a forming machine (in the form of a bending machine) for forming (bending) preferably plate-shaped workpieces 27. The forming machine 20 comprises at least one electromechanical spindle drive 1 with an electric drive source 2, which in the embodiment according to Figure 12 represents a press drive.

[0142] The forming machine includes at least one forming tool 28 whose working movement is caused by an electromechanical spindle drive 1, and at least one braking device 5 operable between a release position and a braking position for braking and / or blocking the working movement 32 of the forming tool 28 (see Figure 13).

[0143] In the method for forming a preferably plate-shaped workpiece 27 in the forming machine 20 , the motor 2 and / or the brake device 5 of the electromechanical spindle drive 1 for forming the workpiece 27 are controlled by a control device 30 .

[0144] 14 and 15, a preferred method for forming a workpiece 17 is shown schematically. In Fig. 14, it can be seen that, prior to an operating phase 33 of the forming tool 28, the electric drive 2 generates a driving torque M while the brake device 5 is in a braking position, such that a braking torque B of the brake device 5 opposes the driving torque M of the electric drive 2. The start of the operating phase 33 of the forming tool 28 is triggered by moving the brake device 5 to a released position and / or a position where the braking torque is reduced.

[0145] It can also be seen in FIG. 15 that the working movement 32 of the forming tool 28 occurs intermittently during the forming process.

[0146] The individual movement stages 33 of the working movement 32 of the forming tool 28 are shown diagrammatically in Figure 17. The distance traveled by the forming tool 28 during the intermittent working movement 32 is summed up from the distance portions traveled during the individual movement stages of the intermittent working movement. It can also be seen here that the direction of movement of the forming tool 28 can remain unchanged during the individual movement stages 33 of the intermittent working movement 32.

[0147] Finally, FIG. 16 shows a modified example in which the driving torque M of the electric driving source 2 is also generated intermittently to realize intermittent working operations.

[0148] The working movement 32 of the forming tool 28 preferably includes a plurality of movement phases 33 during one forming process, which are interrupted by phases 34 in which the forming tool 28 is stationary or moves slower than the movement phases 33. Preferably, the length of each of the individual movement phases 33 is less than 3 seconds, preferably less than 1.5 seconds. Preferably, the length of each of the phases in which the forming tool is stationary or moves slower than the movement phases is less than 3 seconds, preferably less than 1.5 seconds. In this way, for example, a "hammering" action of the forming tool 28 against the workpiece 27 can be achieved.

[0149] 15, it can be seen that the intermittent working movement of the forming tool 28 is caused by intermittently operating the brake device 5 between the release position and the braked position. The braking torque B acting on the rotating element 3 can be higher than the drive torque M acting on the rotating element 3 during the phase in which the brake device 5 is in the braked position during the intermittent operation of the brake device 5. In this case, the operating of the brake device 5 brings the forming tool 28 to a (short-term) standstill.

[0150] The electric drive source 2 can generate the drive torque M even during phases of intermittent operation of the brake device 5 when the brake device 5 is in the braking position. For example, the drive torque M can be kept substantially constant during a forming process involving intermittent working movements 32 of the forming tool 28.

[0151] From Figure 13 and from the preferred embodiment of Figures 1 to 9 which will be explained in more detail later, it can be seen that the electromechanical spindle drive 1 comprises a rotating element 3, on which a braking device 5 acts. An electric drive source 2, which may be formed by a motor, also acts on the rotating element 3 by means of its drive torque M.

[0152] In the case of an electric motor, the drive source 2 may comprise, for example, a stator 2a connected to and / or stationary with respect to the housing 13, and a rotor 2b connected to, for example, the rotating element 3 or arranged directly on the rotating element 3. Corresponding supply and / or control lines lead to the electric drive source 2.

[0153] As will be explained in more detail later in the example of a spindle drive, the electromechanical spindle drive 1 can include a transmission mechanism, in particular a linear gear, which converts the rotation of the rotating element 3 into a linear movement of a transmission element 23 which acts directly or indirectly on the forming tool 28. The transmission element 23 can be designed, for example, in the form of a spindle or a rack (on which a rotating gear acts).

[0154] The braking device 5 is preferably integrated into the electromechanical spindle drive 1, as shown in Figure 13. The electric drive 2 and the braking device 5 can be accommodated in the same housing 13.

[0155] 13 also shows a control device 30 of the molding machine 20 for controlling the electric drive 2 and the brake device 5. The control device 30 stores operating modes 31 by means of which the electric drive 2 and the brake device 5 can be controlled so as to carry out the method described above. The cooperation between the drive 2 and the brake device 5 has already been explained in detail above. The (opposing) action of the drive torque M and the brake torque B makes possible the advantages mentioned at the beginning of this description. The present invention has the following aspects (configurations). [Aspect 1] An electromechanical spindle drive (1), comprising: a housing (13); Motor (2) and a rotating element (3) in the form of a spindle nut, rotatable about a rotation axis (4) by a motor (2); a spindle (23) cooperating with the rotating element (3), the threads of the spindle (23) being disposed inside the rotating element (3) and exiting the rotating element (3) at a spindle outlet end (35); bearings (37, 38, 39) that rotatably support the rotating element (3) relative to the housing (13); In an electromechanical spindle drive (1) having Electromechanical spindle drive (1), characterized in that at least one, preferably at least two bearings (37) are arranged in the region of the spindle outlet end (35) of the rotating element (3) and / or are configured in the form of radial bearings. [Aspect 2] The electromechanical spindle drive (1) according to aspect 1, characterized in that the at least one bearing (37) arranged in the region of the spindle outlet end (35) of the rotating element (3) is arranged inside the rotating element (3), preferably inside the rotating element (3). [Aspect 3] The electromechanical spindle drive (1) according to aspect 1 or 2, characterized in that the at least one bearing (37) arranged in the region of the spindle outlet end (35) of the rotating element (3) is arranged between the inside of the rotating element (3) and a bearing seat (36) protruding into the inside of the rotating element (3), the bearing seat (36) being preferably formed in a housing part (13c) of the housing (13), preferably in a front housing cover. [Aspect 4] 4. The electromechanical spindle drive device (1) according to any one of aspects 1 to 3, characterized in that the at least one bearing (37) arranged in the region of the spindle outlet end (35) of the rotating element (3) is arranged axially overlapping with the stator (2a) and / or rotor (2b) of the motor (2) and / or is arranged within the region surrounded by the stator (2a) and / or rotor (2b) of the motor (2). [Aspect 5] Electromechanical spindle drive (1) according to any one of aspects 1 to 4, characterized in that the at least one bearing (37) arranged in the region of the spindle outlet end (35) of the rotating element (3) is a rolling bearing, in particular a ball bearing. [Aspect 6] 6. The electromechanical spindle drive (1) according to any one of aspects 1 to 5, characterized in that at least one of the bearings (39), preferably a radial bearing, is arranged in the region of an end of the rotating element (3) opposite to the spindle outlet end (35). [Aspect 7] The electromechanical spindle drive (1) according to any one of aspects 1 to 6, wherein at least one of the bearings (38) is an axial bearing, preferably disposed in a region between the motor (2) and the braking device (5) of the electromechanical spindle drive (1). [Aspect 8] 8. The electromechanical spindle drive (1) according to any one of aspects 1 to 7, characterized in that the stator (2a) of the motor (2) surrounds the rotating element (3), and / or the rotor (2b) of the motor (2) comprises pole elements, preferably in the form of permanent magnets, attached, preferably removably, to the outside of the rotating element (3), and / or the motor (2) is a synchronous motor. [Aspect 9] The electromechanical spindle drive (1) according to any one of aspects 1 to 8, characterized in that the electromechanical spindle drive (1) is a rolling spindle drive in which rolling elements (45), in particular in the form of balls, are guided in a circulating path, a first part of the circulating path being formed between the female thread of the rotating element (3) and the male thread of the spindle (23), and a second part of the circulating path being formed by a return path (44), which is formed inside the spindle (23). [Aspect 10] 10. The electromechanical spindle drive (1) according to any one of aspects 1 to 9, characterized in that at an end of the rotating element (3) opposite the spindle outlet end (35), a mounting element (40) is connected to the rotating element (3), preferably the mounting element (40) having a portion located inside the rotating element (3) and / or forming a stop for the spindle (23). [Aspect 11] a portion (46) of the mounting element (40) external to the rotating element (3) is formed in a pin-like shape, and the longitudinal axis of the pin-like portion (46) coincides with the rotation axis (4) of the rotating element (3); The electromechanical spindle drive (1) according to aspect 10, characterized in that the maximum diameter of the portion of the mounting element (40) located inside the rotating element (3) is at least three times, preferably at least four times, the diameter of the pin-shaped portion (46). [Aspect 12] the electromechanical spindle drive (1) has a sensor device (47), and a portion (46) of the mounting element (40) that is external to the rotating element (3) is within a detection range of the sensor device (47); 12. The electromechanical spindle drive (1) according to aspect 10 or 11, characterized in that the sensor device (47) is preferably a rotation sensor that detects the rotation of the mounting element (40). [Aspect 13] 13. The electromechanical spindle drive device (1) according to any one of aspects 10 to 12, wherein a lubricant passage (41) is provided in the mounting element (40) for supplying lubricant to the interior of the rotating element (3). [Aspect 14] The electromechanical spindle drive (1) according to aspect 13, characterized in that the path of the first portion (42) of the lubricant passage (41) coincides with the rotation axis (4) of the rotating element (3), and preferably the first portion (42) of the lubricant passage (41) passes through a portion (46) of the mounting element (40) that is external to the rotating element (3). [Aspect 15] the course of the second part (43) of the lubricant passage (41) has a radial component relative to the axis of rotation (4) and / or is inclined relative to the axis of rotation (4); 15. The electromechanical spindle drive (1) according to aspect 13 or 14, characterized in that the second portion (43) of the lubricant passage (41) preferably passes through a portion of the mounting element (40) located inside the rotating element (3) and / or terminates in an outlet (48) arranged in a peripheral region of the mounting element (40) relative to the rotation axis (4). [Aspect 16] the mounting element (40) is surrounded by a braking device (5) of the electromechanical spindle drive (1); 16. The electromechanical spindle drive (1) according to any one of aspects 10 to 15, wherein the mounting element (40) is preferably located in a central recess of the brake disc (6) of the brake device (5) and / or forms a preferably form-fitting receiving portion for the brake disc (6) of the brake device (5). [Aspect 17] cooling fins (49) are arranged on the outside of the housing (13) at least in the area of ​​the motor (2); The electromechanical spindle drive (1) according to any one of aspects 1 to 16, wherein the cooling fins (49) are preferably detachable from the housing body. [Aspect 18] The electromechanical spindle drive device (1) according to any one of aspects 1 to 17, characterized in that the electromechanical spindle drive device (1) is constructed in a modular manner. [Aspect 19] The electromechanical spindle drive (1) has a brake (5) operable between a brake position and a release position; The braking device (5) acts on the rotating element (3), 19. The electromechanical spindle drive (1) according to any one of aspects 1 to 18, wherein the braking device (5) is preferably arranged in the region of an end of the rotating element (3) opposite the spindle outlet end (35). [Aspect 20] 20. The electromechanical spindle drive (1) according to any one of aspects 1 to 19, characterized in that the braking device (5) comprises a braking disc (6) which rotates together with the rotating element (3) and a braking element (7) which is axially adjustable and acts on the braking disc (6) in a braking position. [Aspect 21] The braking disc (6) an inner region (8); a friction surface area (10) having a first friction surface (11) formed on a first side of the brake disc (6) and extending annularly around the rotation axis (4); an intermediate region (9) extending between the friction surface region (10) and the inner region (8) around the rotation axis (4); 21. The electromechanical spindle drive (1) according to any one of aspects 1 to 20, characterized in that a first opposing surface (17) is formed on the braking element (7), facing the first friction surface (11) and cooperating with the first friction surface (11) in the braking position. [Aspect 22] The electromechanical spindle drive (1) according to aspect 21, characterized in that the intermediate region (9) of the brake disc (6) has no contact with the brake element (7) in the release position and the braking position, and / or in the braking position, contact between the brake element (7) and the brake disc (6) is limited to the first friction surface (11). [Aspect 23] the intermediate region (9) is a deformation region in which the braking element (7) can elastically deform in the axial direction by acting on the braking disc (6); 23. The electromechanical spindle drive (1) according to aspect 21 or 22, characterized in that cutouts (19), preferably in the form of through holes, and / or weakened portions of the material are preferably formed in the deformation region. [Aspect 24] The friction surface area (10) has a second friction surface (12) formed on a second side of the brake disc (6) opposite to the first side, 24. The electromechanical spindle drive (1) according to any one of aspects 21 to 23, wherein the friction surface area (10) of the brake disc (6) is arranged between the first opposing surface (17) and a second opposing surface (18) facing a second friction surface (12) and cooperating with the second friction surface (12) in the braking position. [Aspect 25] A spindle drive component set including components for a plurality of electromechanical spindle drives (1) according to any one of aspects 1 to 24, the spindle drive component set includes a plurality of components of different types, the plurality of components having connection interfaces for connecting the plurality of components to each other; A spindle drive component set, characterized in that a plurality of components of the same type have different sizes, and the connection interfaces of the plurality of components of the same type and different sizes have the same dimensions. [Aspect 26] The spindle drive component set comprises: a first housing portion having a different length and / or width; a second housing portion having a different length and / or width; The spindle drive component set of claim 25, wherein the connection interfaces of the first housing parts for connecting with the second housing parts are designed with the same dimensions in all of the first housing parts and all of the second housing parts. [Aspect 27] The spindle drive component set comprises: A plurality of rotating elements of different lengths and / or widths; a plurality of housing portions of different lengths and / or widths, and / or a plurality of motors of different lengths and / or widths; 27. The spindle drive component set of claim 25 or 26, wherein connection interfaces of the plurality of rotating elements for connecting with the plurality of housing parts and / or the plurality of motors have the same dimensions for all rotating elements, and / or wherein connection interfaces of the plurality of housing parts and / or the plurality of motors for connecting with the plurality of rotating elements have the same dimensions for all housing parts and / or all motors. [Aspect 28] A forming machine (20), in particular a bending machine, for forming a workpiece (27), preferably in the form of a plate, The molding machine (20) at least one electromechanical spindle drive (1); and at least one forming tool (28) whose working operation is performed by the electromechanical spindle drive (1), A molding machine (20) characterized in that the electromechanical spindle drive device (1) is the electromechanical spindle drive device according to any one of aspects 1 to 24. [Aspect 29] A method for forming a preferably plate-shaped workpiece (27) using a forming machine (20), in particular a bending machine, comprising: The method is characterized in that the forming machine (20) is the forming machine described in embodiment 28, and the motor (2) of the electromechanical spindle drive (1) for forming the workpiece (27) is controlled by a control device (30). [Explanation of symbols]

[0156] 1 Electromechanical spindle drive 2 motors 2a stator 2B rotor 3 Rotational Elements 4 Rotation axis 5 Braking device 6 Braking discs 7 Braking Elements 8 Inner area 9 Intermediate area 10 Friction surface area 11 First friction surface 12 Second friction surface 13. Housing 13a Housing part 13b Housing part 13c Housing part 14 First spacer ring 15 Second spacer ring 16 Mounting Interface 17 First opposing surface 18 Second opposing surface 19 Cutout 20 Molding machine 21 Spring 22 Actuator 23 Spindle 24 Base body 25 First Tool Carrier 26 Second Tool Carrier 27 Workpiece 28 Forming tools 29 Forming tools 30 Control device 31 Operating Modes 32 Work movements 33 Operational Stage 34 stages 35 Spindle outlet end 36 Bearing seat 37 Bearings in the area of ​​the spindle outlet end 38 Axial bearing 39 Radial bearings 40 Mounting element 41 Lubricating oil passage 42 First portion of lubricating oil passage 43 Second part of lubricating oil passage 44 Return 45 rolling elements 46 Pin-shaped part 47 Sensor Device 48 Exit 49 Cooling fins B Braking torque M driving torque

Claims

1. An electromechanical spindle drive (1), comprising: a housing (13); A motor (2), a rotating element (3) in the form of a spindle nut, rotatable about a rotation axis (4) by a motor (2); a spindle (23) cooperating with said rotating element (3), the threads of said spindle (23) being disposed inside said rotating element (3) and exiting said rotating element (3) at a spindle outlet end (35); bearings (37, 38, 39) that rotatably support the rotating element (3) relative to the housing (13); In an electromechanical spindle drive (1) having At least one bearing (37) is arranged in the region of the spindle outlet end (35) of the rotating element (3), 1. An electromechanical spindle drive (1), characterized in that the at least one bearing (37) arranged in the region of the spindle outlet end (35) of the rotating element (3) is arranged inside the rotating element (3).

2. 2. The electromechanical spindle drive (1) according to claim 1, characterized in that the at least one bearing (37) arranged in the region of the spindle outlet end (35) of the rotating element (3) is arranged inside the rotating element (3).

3. An electromechanical spindle drive device (1) as described in claim 1 or 2, wherein at least one bearing (37) is configured in the form of a radial bearing.

4. 4. An electromechanical spindle drive (1) according to claim 1, wherein the at least one bearing (37) arranged in the region of the spindle outlet end (35) of the rotating element (3) is arranged between the inside of the rotating element (3) and a bearing seat (36) protruding into the interior of the rotating element (3).

5. 5. The electromechanical spindle drive (1) according to claim 4, characterized in that the bearing seat (36) is formed in a housing part (13c) of the housing (13) or in a front housing cover.

6. 6. An electromechanical spindle drive (1) according to any one of claims 1 to 5, characterized in that the at least one bearing (37) arranged in the region of the spindle outlet end (35) of the rotating element (3) is arranged axially overlapping with the stator (2a) and / or rotor (2b) of the motor (2) and / or is arranged in the region surrounded by the stator (2a) and / or rotor (2b) of the motor (2).

7. 7. The electromechanical spindle drive (1) according to claim 1, wherein the at least one bearing (37) arranged in the region of the spindle outlet end (35) of the rotating element (3) is a rolling bearing or a ball bearing.

8. 8. An electromechanical spindle drive (1) according to any one of claims 1 to 7, characterized in that at least one of the bearings (39) is arranged in the region of an end of the rotating element (3) opposite the spindle outlet end (35).

9. 9. The electromechanical spindle drive (1) according to claim 1, wherein at least one of the bearings (38) is an axial bearing and is arranged in the region between the motor (2) and the braking device (5) of the electromechanical spindle drive (1).

10. 10. The electromechanical spindle drive (1) according to any one of claims 1 to 9, characterized in that the stator (2a) of the motor (2) surrounds the rotating element (3) and / or the rotor (2b) of the motor (2) comprises pole elements attached to the outside of the rotating element (3).

11. 11. Electromechanical spindle drive (1) according to claim 10, characterized in that the pole elements are in the form of permanent magnets.

12. 12. Electromechanical spindle drive (1) according to claim 10 or 11, characterized in that the pole elements are removably mounted.

13. Electromechanical spindle drive (1) according to any one of claims 10 to 12, characterized in that the motor (2) is a synchronous motor.

14. The electromechanical spindle drive (1) according to any one of claims 1 to 13, characterized in that the electromechanical spindle drive (1) is a rolling spindle drive in which a rolling element (45) is guided in a circulating path, a first part of the circulating path being formed between the female thread of the rotating element (3) and the male thread of the spindle (23), and a second part of the circulating path being formed by a return path (44), which is formed inside the spindle (23).

15. 15. Electromechanical spindle drive (1) according to claim 14, characterized in that the rolling elements (45) are in the form of spheres.

16. 16. The electromechanical spindle drive (1) according to any one of claims 1 to 15, characterized in that an attachment element (40) is connected to the rotating element (3) at an end of the rotating element (3) opposite the spindle outlet end (35).

17. 17. The electromechanical spindle drive (1) according to claim 16, characterized in that the mounting element (40) has a portion located inside the rotating element (3) and / or forms a stop for the spindle (23).

18. 18. An electromechanical spindle drive (1) according to claim 16 or 17, characterized in that the part (46) of the mounting element (40) that is external to the rotating element (3) is formed in a pin-like shape, the longitudinal axis of the pin-like part (46) coinciding with the rotation axis (4) of the rotating element (3).

19. 19. The electromechanical spindle drive (1) according to claim 18, characterized in that the maximum diameter of the part of the mounting element (40) located inside the rotating element (3) is at least three times or at least four times the diameter of the pin-shaped part (46).

20. The electromechanical spindle drive (1) according to any one of claims 16 to 19, characterized in that the electromechanical spindle drive (1) has a sensor device (47), and a part (46) of the mounting element (40) that is external to the rotating element (3) is within a detection range of the sensor device (47).

21. 21. Electromechanical spindle drive (1) according to claim 20, characterized in that the sensor device (47) is a rotation sensor for detecting the rotation of the mounting element (40).

22. 22. The electromechanical spindle drive (1) according to any one of claims 16 to 21, characterized in that a lubricant passage (41) is provided in the mounting element (40) for supplying lubricant to the interior of the rotating element (3).

23. 23. The electromechanical spindle drive (1) according to claim 22, characterized in that the course of the first part (42) of the lubricating oil passage (41) coincides with the rotation axis (4) of the rotating element (3).

24. 24. The electromechanical spindle drive (1) according to claim 23, characterized in that the first portion (42) of the lubricant passage (41) passes through a portion (46) of the mounting element (40) that is external to the rotating element (3).

25. 25. An electromechanical spindle drive (1) according to any one of claims 22 to 24, characterized in that the course of the second part (43) of the lubricating oil passage (41) has a radial component with respect to the axis of rotation (4) and / or is inclined with respect to the axis of rotation (4).

26. 26. An electromechanical spindle drive (1) according to claim 25, characterized in that the second part (43) of the lubricating oil passage (41) passes through a part of the mounting element (40) located inside the rotating element (3) and / or ends in an outlet (48) arranged in a peripheral region of the mounting element (40) relative to the rotation axis (4).

27. Electromechanical spindle drive (1) according to any one of claims 16 to 26, characterized in that the mounting element (40) is surrounded by a braking device (5) of the electromechanical spindle drive (1).

28. 28. The electromechanical spindle drive (1) according to claim 27, characterized in that the mounting element (40) is located in a central recess of a brake disc (6) of the brake device (5) and / or forms a receiving or form-locking receiving portion for the brake disc (6) of the brake device (5).

29. Electromechanical spindle drive (1) according to any one of claims 1 to 28, characterized in that cooling fins (49) are arranged on the outside of the housing (13) at least in the area of ​​the motor (2).

30. 30. The electromechanical spindle drive (1) according to any one of claims 1 to 29, characterized in that the electromechanical spindle drive (1) is constructed modularly.

31. The electromechanical spindle drive (1) has a brake (5) operable between a braked position and a released position, The braking device (5) acts on the rotating element (3), 31. The electromechanical spindle drive (1) according to any one of claims 1 to 30, characterized in that the braking device (5) is arranged in the region of the end of the rotating element (3) opposite the spindle outlet end (35).

32. 32. The electromechanical spindle drive (1) according to any one of claims 1 to 31, characterized in that the braking device (5) comprises a braking disk (6) which rotates together with the rotating element (3) and a braking element (7) which is axially adjustable and acts on the braking disk (6) in a braking position.

33. The braking disc (6) an inner region (8); a friction surface area (10) having a first friction surface (11) formed on a first side of the brake disc (6) and extending annularly around the rotation axis (4); an intermediate region (9) extending between the friction surface region (10) and the inner region (8) around the rotation axis (4); 33. The electromechanical spindle drive (1) according to any one of claims 1 to 32, characterized in that a first counter surface (17) is formed on the braking element (7), facing said first friction surface (11) and cooperating with said first friction surface (11) in the braking position.

34. 34. An electromechanical spindle drive (1) according to claim 33, characterized in that the intermediate region (9) of the brake disc (6) is free from contact with the brake element (7) in the release position and in the braking position, and / or in that contact between the brake element (7) and the brake disc (6) is limited to the first friction surface (11).

35. the intermediate region (9) is a deformation region in which the braking element (7) can be elastically deformed in the axial direction by acting on the braking disc (6), 35. Electromechanical spindle drive (1) according to claim 33 or 34, characterized in that cutouts (19) and / or weakened areas of the material are formed in the deformation area.

36. The friction surface area (10) has a second friction surface (12) formed on a second side of the brake disc (6) opposite to the first side, 36. An electromechanical spindle drive (1) according to any one of claims 33 to 35, characterized in that the friction surface area (10) of the brake disc (6) is arranged between the first opposing surface (17) and a second opposing surface (18) facing a second friction surface (12) and cooperating with the second friction surface (12) in the braking position.

37. A spindle drive component set comprising components for a plurality of electromechanical spindle drives (1), wherein the plurality of electromechanical spindle drives (1) are electromechanical spindle drives (1) according to any one of claims 1 to 36.

38. A forming machine (20) for forming a workpiece (27), comprising: The molding machine (20) At least one electromechanical spindle drive (1); and at least one forming tool (28) whose working action is performed by the electromechanical spindle drive (1), A forming machine (20) characterized in that the electromechanical spindle drive (1) is an electromechanical spindle drive according to any one of claims 1 to 36.

39. A method for forming a workpiece (27) using a forming machine (20), comprising:

39. The method according to claim 38, wherein the forming machine (20) is a forming machine according to claim 38, and the motor (2) of the electromechanical spindle drive (1) for forming the workpiece (27) is controlled by a control device (30).

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