Stamping and forming tool and method for machining a workpiece

Abstract

The invention relates to a stamping and forming tool (10) with a base plate (6) and with a head plate (2) which is movably mounted towards and away from the base plate (6) in a stamping stroke direction (5), and with an intermediate plate (4), preferably spring-mounted, which is arranged between the base plate (6) and head plate (2) and is movably mounted relative to the base plate (6) and head plate (2) in the stamping stroke direction (5), wherein the base plate (6) and / or the head plate (2) and / or the intermediate plate (4) comprise at least one processing tool and at least one corresponding counter tool for processing a workpiece, wherein the intermediate plate (4) is designed to hold down and / or strip the workpiece, and wherein the intermediate plate (4) is coupled to the head plate (2) by at least one holding device (9).According to the invention, the at least one holding device (9) has a pivotable holding element (21) for holding the intermediate plate (4), which is movable between a closed position (7), in which the intermediate plate (4) is coupled to the head plate (2), and an open position (8), in which the intermediate plate (4) is decoupled from the head plate (2).

Description

[0001] The invention relates to a punching and forming tool according to the preamble of claim 1. The invention further relates to a method for machining a workpiece according to claim 13.

[0002] Such punching and forming tools can be used to process a wide variety of materials, such as metals, plastics, textiles, foils, paper or cardboard.

[0003] For example, film processing systems occasionally use moving punching tools. The film material, in strip form, is continuously moved in a material feed direction.

[0004] EP 2 279 835 B1 relates to such a punching tool, which can be used, for example, in a film processing plant to trim the edge of a coated continuous film.

[0005] The punching tool comprises an upper tool and a lower tool, with the upper tool positioned above the film material and the lower tool positioned below it. To perform the punching process, the closing punching tool moves synchronously with the film material. After completing the punching stroke, the punching tool opens and is then moved back to its original position.

[0006] The punching tool therefore not only performs an opening and closing movement, but also a back-and-forth movement in and against the film transport direction or against the workpiece transport direction. The punching unit moves with the passing film for the duration of each punching operation. It then returns to its original position in the open state to process the next film section.

[0007] DE 10 2022 133 924 A1 discloses a clamping unit for a molding machine comprising a first mold clamping plate, a second mold clamping plate, and at least one intermediate plate. The intermediate plate is arranged between the first mold clamping plate and the second mold clamping plate and has two intermediate plate tool parts arranged on mutually facing sides of the intermediate plate. The first mold clamping plate has a first tool part, the second mold clamping plate has a second tool part, and the first tool part, together with one of the intermediate plate tool parts, forms a molding tool, preferably an injection molding tool, on the first mold clamping plate. The second tool part, together with one of the intermediate plate tool parts, forms a punching and / or deburring tool on the second mold clamping plate.

[0008] From DE 10 2021 120 038 A1 a punching machine for processing cardboard sheets for the production of packaging materials is known.

[0009] DE 10 2021 120 038 A1 relates to a carrier plate for a punching tool for producing blanks from a flat raw material, preferably from cardboard or paperboard, wherein the carrier plate is formed by a resin-based matrix and preferably synthetic fibers embedded therein and has at least one slot for receiving a punching knife or a creasing knife, wherein, viewed across the cross-section of the carrier plate, areas with an increased fiber concentration are provided at least in the region of the at least one slot.

[0010] DE 44 28 250 A1 discloses a method for deburring and piercing a flange-shaped, particularly forged, workpiece. The workpiece is firmly clamped and an internal recess is created in the workpiece by moving the punching tool vertically downwards. The peripheral edge of the workpiece is deburred using an annular cutting tool that can be moved vertically relative to the workpiece.

[0011] A disadvantage of the known devices is the complex replacement of a defective tool, since a holding device is often provided to hold the intermediate plate, whereby this holding device has to be attached to the device in a very complex manner, for example by means of a screw connection.

[0012] Based on the disadvantages described above, the object of the invention is to simplify the replacement of a tool or a tool part in a punching and forming tool.

[0013] This object is achieved with a punching and forming tool according to claim 1 and with a method for machining a workpiece according to claim 13. Advantageous embodiments of the invention are the subject of the subclaims.

[0014] The invention relates to a punching and forming tool comprising a base plate and a head plate mounted so as to be movable relative to the base plate in a punching stroke direction toward and away from the base plate. Furthermore, a preferably spring-mounted intermediate plate is provided, which is arranged between the base plate and head plate and is mounted so as to be movable relative to the base plate and head plate in the punching stroke direction.

[0015] The base plate and / or the head plate and / or the intermediate plate has / have at least one machining tool and at least one corresponding counter-tool for machining a workpiece in a punching or forming process.

[0016] The intermediate plate is designed to hold down and / or strip the workpiece, with the intermediate plate being coupled to the head plate by at least one holding device. This holding device can also be referred to as a clamp or clamp.

[0017] In other words, for metalworking, plastics, paper, or textile processing, at least one processing tool is provided, which acts on a workpiece arranged between the base plate and the intermediate plate during a punching process. The head plate and intermediate plate are connected to each other in order to move the intermediate plate synchronously with the head plate over at least part of the punching or lifting path.

[0018] According to the invention, the at least one holding device has a pivotable holding element for holding the intermediate plate on the head plate, which is movable between a closed position in which the intermediate plate is coupled to the head plate, and an open position in which the intermediate plate is decoupled from the head plate.

[0019] In this way, the normal stroke punching process can be performed in the normal position, i.e., in the closed position. In the open position, in which the intermediate plate is decoupled from the head plate, tool parts can be easily replaced or inserted onto the plates.

[0020] By opening the holding device or the clamps, the intermediate plate can be placed on the lower part of the tool without removing the tool from the device or the press, and in this way a repair or adjustment can be made to the upper part, i.e. the head plate.

[0021] This creates an immense time advantage when dismantling the intermediate plate compared to conventional, rigid clamps or screw connections, such as screws with spacer tubes or shoulder bolts, which first have to be laboriously loosened.

[0022] Steel, for example unalloyed structural steel (S235JR), can be used as the material for the holding device.

[0023] In principle, the system can be integrated or retrofitted into almost all punching and forming tools with an intermediate plate.

[0024] The holding device also provides mounting options for sensors, for example, to detect faulty locking of the punching and forming tool. The individual components remain permanently installed on the punching and forming tool, eliminating the need to disassemble the intermediate plate for maintenance purposes.

[0025] Furthermore, a damping element can be easily integrated into the pivot point. The components can be largely identical, regardless of the size of the punching and forming tool.

[0026] According to the invention, the holding element of the at least one holding device has a substantially L-shaped or U-shaped profile, wherein one leg of the substantially L-shaped or U-shaped profile is designed as a support leg for receiving or coupling the intermediate plate.

[0027] A further embodiment provides that a further leg of the essentially L-shaped or U-shaped profile is mechanically connected to the head plate, in particular by a screw connection to the head plate in order to ensure a secure hold.

[0028] According to the invention, the leg of the holding device, designed as a support leg for the intermediate plate, is movable between the open and closed positions by means of a hinge. In the closed position, the leg serves as a support for the intermediate plate and is disengaged from the intermediate plate in the open position. This significantly simplifies the coupling and decoupling of the intermediate plate to the head plate. The hinged design of the holding element eliminates the need for complex screw connections.

[0029] In particular, the hinge can be formed by a hinge pin forming a rotation axis around which the leg is mounted so as to be movable or pivotable between the open and closed positions.

[0030] According to an advantageous embodiment of the invention, the holding device is designed in the manner of a clamp or clip, which mechanically couples the head plate and the intermediate plate. This significantly facilitates access from the outside without the need for laborious disassembly of the punching and forming tool. Furthermore, access is also possible during the production process.

[0031] Advantageously, it is conceivable that at least one sensor, in particular an induction sensor, is provided for determining the position of the intermediate plate and / or for detecting foreign bodies, wherein the sensor is connected to a production plant or punching press having the punching and forming tool.

[0032] The sensor, in particular an inductive proximity sensor, emits a signal as long as it is in contact with the intermediate platen. When the punching tool is closed via the downward movement of the press and the intermediate platen hits the lower part of the tool to hold down the workpiece, the sensor's contact is interrupted in a controlled manner. The signal is evaluated via the control system of the production system or the punching press. Signals from the sensor system can be queried as a function of the eccentric angle of a punching press. This means, for example, during the downward movement of the press, the sensor signal begins to be recorded at 0° (press at top dead center) and the tool begins to close. At an eccentric angle of 140°, the intermediate platen touches the lower part and the signal is interrupted. At 180°, the tool is completely closed and the machining process is finished.If there is a foreign body on the workpiece or the tool base, the signal can be interrupted before the specified angle (e.g. 180°) and the machine can be stopped.

[0033] By additionally incorporating a sensor, particularly an inductive or proximity sensor, the position of the intermediate plate can be continuously monitored. If the sensor signal is interrupted before the intermediate plate reaches its end point, the device's drive can be interrupted immediately. The larger the foreign object, the sooner the device shuts down, thus significantly minimizing damage to the tool. Furthermore, it is also possible to monitor whether slugs are adhering to the intermediate plate and are being moved along unintentionally. These could then be transported further in the feed direction, potentially causing damage to the tool or the component.

[0034] According to a further advantageous embodiment of the invention, the at least one sensor is arranged on the holding device, in particular on the leg of the substantially L-shaped or U-shaped profile designed as a support leg for receiving or coupling the intermediate plate. This allows for further optimization of the installation space. Furthermore, simple installation of the holding device equipped with a sensor on the tool is possible.

[0035] An embodiment in which the intermediate plate is resiliently mounted is advantageous, in particular wherein an elastic damping element, preferably an elastomer spring, is provided.

[0036] According to a further advantageous embodiment of the invention, the holding device has the elastic damping element, wherein the leg of the substantially L-shaped or U-shaped profile designed as a support leg for receiving or coupling the intermediate plate is elastically or resiliently mounted by means of the damping element.

[0037] An independent idea of ​​the invention relates to a method for machining a workpiece with a punching and forming tool as described above, wherein the intermediate plate is mechanically coupled to the head plate by at least one holding device, wherein the at least one holding device is moved between a closed position in which the intermediate plate is held on the head plate and an open position in which the intermediate plate is decoupled from the head plate.

[0038] Further objects, advantages, features, and possible applications of the present invention will become apparent from the following description of an exemplary embodiment with reference to the drawing. All described and / or illustrated features, individually or in any meaningful combination, constitute the subject matter of the present invention, regardless of their summary in the claims or their interrelationship.

[0039] Some of them are shown schematically: Fig. 1 a side view of a punching and forming tool with a holding device for an intermediate plate in a closed position and Fig. 2 a side view of the punching and forming tool according to Fig. 1 with the holding device in an open position.

[0040] In the following figures of the drawing, identical or equivalent components are provided with reference numerals based on an embodiment in order to improve readability.

[0041] The Fig. 1 and Fig. 2 show a punching and forming tool 10 with a base plate 6 and with a head plate 2 which is mounted so as to be movable relative to the base plate 6 in a punching stroke direction 5 towards and away from the base plate. The punching stroke direction 5 is shown in the Fig. 1 and Fig. 2 indicated by an arrow.

[0042] Furthermore, in the Fig. 1 and Fig. 2 shows an intermediate plate 4 which is arranged between the base plate 6 and the head plate 2 and is movably mounted in the punching stroke direction 5 relative to the base plate 6 and the head plate 2.

[0043] The head plate 2 has guide columns 12, which extend into corresponding guide openings 13 in the base plate 6 to guide the head plate 2 and the intermediate plate 4. In the present case, the guide columns 12 penetrate the intermediate plate 4, so that the intermediate plate 4 is slidably mounted on the guide column 12.

[0044] The base plate 6 and / or the head plate 2 and / or the intermediate plate 4 can have at least one machining tool and at least one corresponding counter-tool for machining a workpiece 1. In the present case, such a machining tool 3 is arranged on the head plate 2, as the Fig. 1 and Fig. 2. This machining tool 3 is designed as a punching tool and acts on the workpiece 1 by being moved downwards together with the head plate 2 towards the workpiece 1 and the workpiece 1 is formed according to the shape of the machining tool head and the corresponding counter tool.

[0045] During the punching and lifting movement, the machining tool 3 penetrates the intermediate plate 4 in order to act on the workpiece 1 (cf. Fig. 1 and Fig. 2).

[0046] The workpiece 1 is continuously moved through the punching and forming tool 10 in a workpiece transport direction by transport means not further illustrated, preferably at a constant speed. The punching and forming tool 10 performs punching or forming operations on the workpiece 1, for example, to shape the workpiece 1 or to trim one or more edges. The punching and forming tool 10 can, for example, also perform a back-and-forth movement parallel to the workpiece transport direction.

[0047] The means for opening and closing the punching and forming tool 10 are in the Fig. 1 and Fig. 2 is not illustrated. This is a suitably prepared punching machine that opens and closes the punching and forming tool 10.

[0048] The head plate 2 is connected to a ram of the punching press (not further illustrated) or a corresponding machine part, so that the head plate 2 is imparted the corresponding relative movement with respect to the base plate 6. The base plate 6, on the other hand, rests on a support that is immovable with respect to the punching stroke direction 5.

[0049] The intermediate plate 4 serves to hold down and / or strip off the workpiece 1 and is coupled to the head plate 2 by at least one holding device 9, also called a clamp.

[0050] In the execution according to the Fig. 1 and Fig. 2, the holding device 9 shown therein has a pivotable holding element 21 for holding the intermediate plate 4. Several such holding devices 9 are provided for holding the intermediate plate 4, of which only one is shown as an example.

[0051] The holding element 21 is between a closed position 7 (cf. Fig. 1), in which the intermediate plate 4 is coupled to the head plate 2, and an opening position 8 (cf. Fig. 2) in which the intermediate plate 4 is decoupled from the head plate 2.

[0052] The Fig. 1 shows the punching and forming tool 10 with holding element 21 in closed position 7 and the Fig. 2 shows the holding element 21 in the open position 8.

[0053] The holding element 21 of the at least one holding device 9 has a substantially L-shaped profile 15, wherein one leg 11 of the substantially L-shaped profile 15 is designed as a support leg for receiving or coupling the intermediate plate 4. A U-shaped profile is also conceivable.

[0054] A further leg 16 of the essentially L-shaped profile 15 is mechanically connected to the head plate 2, in this case screwed to the head plate 2 by a screw connection.

[0055] The L-shaped profile 15 with the leg 11 designed as a support leg for the intermediate plate 4 is movable by means of a hinge 18 between the opening position 8 and the closed position 7, wherein the leg 11 serves as a support for the intermediate plate 4 in the closed position 7 (cf. Fig. 1) and in the open position 8 is out of engagement with the intermediate plate 4 (cf. Fig. 2).

[0056] The hinge 18 is formed in the present case by a hinge pin 20 forming a rotation axis 19, around which the leg 11 is mounted so as to be movable or pivotable between the opening position 8 and the closing position 7.

[0057] The holding device 9 is designed in the manner of a clamp or clamp, which mechanically couples the head plate 2 and the intermediate plate 4 to one another.

[0058] In the present case, at least one sensor 14, in particular an induction sensor, is provided for determining the position of the intermediate plate 4 for foreign body detection.

[0059] The sensor 14 is connected to a control and regulating device of a production plant or punching press having the punching and forming tool 10.

[0060] The sensor 14 is arranged in the present case on the holding device 9, in particular on the leg 11 of the substantially L-shaped profile 15 designed as a support leg for receiving or coupling the intermediate plate 4.

[0061] The sensor 14, in particular an inductive proximity sensor, outputs a signal as long as it is in contact with the intermediate plate 4. When the punching tool is closed by the downward movement of the press and the intermediate plate 4 strikes the lower part of the tool to hold down the workpiece 1, the sensor's contact is interrupted in a controlled manner, with the signal being evaluated via the control and regulating device of the punching and forming tool 10 or the production system comprising the punching and forming tool 10.

[0062] The intermediate plate 4 is mounted spring-loaded or elastically. For this purpose, an elastic damping element 17 is provided, which is arranged on the holding device 9 (see Fig. Fig. 1 and Fig.2). The leg 11 of the substantially L-shaped profile 15, designed as a support leg for receiving or coupling the intermediate plate 4, is elastically or resiliently mounted by means of the damping element 17, so that the intermediate plate 4 coupled to the holding device 9 is also elastically mounted. List of reference symbols 1 workpiece 2 headstock 3 Editing tool 4 intermediate plate 5 Punching stroke direction 6 Base plate 7 Closed position 8 Opening position 9 Holding device 10 Punching and forming tools 11 legs 12 Guide column 13 Guide opening 14 Sensor 15 L-shaped profile 16 leg L-shaped profile 17 Damping element 18 Hinge 19 axis of rotation 20 hinge bolts 21 Holding element

Claims

[1] Punching and forming tool (10) with a base plate (6) and with a head plate (2) which is mounted so as to be movable towards and away from the base plate (6) in a punching stroke direction (5), and with an intermediate plate (4) which is arranged between the base plate (6) and the head plate (2) and is movably mounted in the punching stroke direction (5) relative to the base plate (6) and the head plate (2), wherein the base plate (6) and / or the head plate (2) and / or the intermediate plate (4) have at least one machining tool and at least one corresponding counter-tool for machining a workpiece, wherein the intermediate plate (4) is designed to hold down and / or strip the workpiece, wherein the intermediate plate (4) is coupled to the head plate (2) by at least one holding device (9), wherein the at least one holding device (9) has a pivotable holding element (21) for holding the intermediate plate (4), which is movable between a closed position (7), in which the intermediate plate (4) is coupled to the head plate (2), and an open position (8) in which the intermediate plate (4) is decoupled from the head plate (2), characterized byin that the holding element (21) of the at least one holding device (9) has a substantially L-shaped (15) or U-shaped profile, wherein one leg (11) of the substantially L-shaped (15) or U-shaped profile is designed as a support leg for receiving or coupling the intermediate plate (4), and the leg (11) of the holding device (9) designed as a support leg for the intermediate plate (4) is movable by means of a hinge (18) between the open position (8) and the closed position (7), wherein the leg (11) serves as a support for the intermediate plate (4) in the closed position (7) and is disengaged from the intermediate plate (4) in the open position (8). [2] Punching and forming tool (10) according to claim 1, characterized by that a further leg (16) of the substantially L-shaped (15) or U-shaped profile is mechanically operatively connected to the head plate (2). [3] Punching and forming tool (10) according to claim 2, characterized by that the further leg (16) is connected to the head plate (2) by a screw connection. [4] Punching and forming tool (10) according to claim 1, characterized by that the hinge (18) is formed by a hinge pin (20) forming a rotation axis (19) about which the leg (11) is mounted so as to be movable or pivotable between the opening (8) and the closing position (7). [5] Punching and forming tool (10) according to one of the preceding claims, characterized by that the holding device (9) is designed in the manner of a clamp or clamp which mechanically couples the head plate (2) and the intermediate plate (4) to one another. [6] Punching and forming tool (10) according to one of the preceding claims, characterized by that the holding device (9) consists essentially of steel. [7] Punching and forming tool (10) according to one of the preceding claims, characterized bythat at least one sensor (14) is provided for determining the position of the intermediate plate (4), wherein the sensor (14) is connected to a control and regulating device of a production plant or punching press having the punching and forming tool (10). [8] Punching and forming tool (10) according to claim 7, characterized by that the at least one sensor (14) is arranged on the holding device (9). [9] Punching and forming tool (10) according to claim 8, characterized by that the at least one sensor (14) is arranged on the leg (11) of the substantially L-shaped (15) or U-shaped profile designed as a support leg for receiving or coupling the intermediate plate (4). [10] Punching and forming tool (10) according to one of the preceding claims, characterized by that the intermediate plate (4) is spring-mounted. [11] Punching and forming tool (10) according to claim 10, characterized bythat an elastic damping element (17) is provided. [12] Punching and forming tool (10) according to claim 11, characterized by that the holding device (9) has the elastic damping element (17), wherein the leg (11) of the substantially L-shaped (15) or U-shaped profile, which leg is designed as a support leg for receiving or coupling the intermediate plate (4), is elastically or resiliently mounted by means of the damping element (17). [13] Method for machining a workpiece (1) with a punching and forming tool (10) according to one of claims 1 to 12, wherein the intermediate plate (4) is mechanically coupled to the head plate (2) with at least one holding device (9), wherein the at least one holding device (9) is moved between a closed position (7), in which the intermediate plate (4) is held on the head plate (2), and an open position (8) in which the intermediate plate (4) is decoupled from the head plate (2).

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