DE102024000975B4 - Tool for use in a punching machine, as well as machining device for a punching machine and method using a punching machine with a machining device - Google Patents

Abstract

Tool (1) for use in a punching machine (10) comprising: - a housing with a working opening; - a working spindle (8) which is rotatably mounted on the housing by means of a bearing element about a drive axis; - a machining tool (9) which can be arranged non-rotatably on the working spindle (8); - a drive unit; - a transmission device which connects the drive unit to the working spindle (8), wherein the transmission device is arranged in the housing and wherein the machining tool (9) projects out of the working opening and forms a machining area (BA); - an auxiliary tool (11); wherein the tool (1) can be arranged in the punching machine (10) to be opposite the auxiliary tool (11).

Description

The present invention relates to the field of stamping technology and concerns a tool for use in a stamping machine according to claim 1. Furthermore, the invention relates to a processing device for a stamping machine according to claim 10 and to a method using a stamping machine with a processing device according to claim 11.

Tools and processes in the field of stamping technology are primarily used for the efficient creation of precise cutouts, shapes, or perforations in various materials such as metal, plastic, or paper. These applications span diverse industries, including metalworking, packaging, automotive, and electronics manufacturing.

Conventional die-cutting machines consist of a punch, a stripper, and a corresponding die. Die-cutting machines of the type described above, which, within a broader interpretation of the terminology used here, can be considered die-cutting machines—that is, including nibbling machines—exist in various configurations with purely mechanical drives.

In addition to purely mechanically driven punching machines, CNC punching machines are also known, which are distinguished primarily by their electro-hydraulic drive unit, as well as purely electric punching machines that utilize a fully electric drive. Unlike punching machines with a purely mechanical drive unit, these allow the stroke of the punch unit and, if necessary, its movement sequence to be freely programmed within machine-specific limits.

In the field of die-cutting technology, turret die-cutting machines represent an increasingly relevant category, distinguished from conventional die-cutting machines by their unique design. A defining characteristic of this type of machine is the presence of a pair of fan- or disc-shaped carousels, which are rotatably arranged and vertically aligned with each other. Each of these carousels is equipped with a variety of upper punches and lower dies, specifically designed for performing various die-cutting operations.

In addition, some punching machines have an integrated automated tool changer, which enables a quick and automatic exchange of the punching tools.

A significant feature of turret punch presses that distinguishes them from conventional systems is the integration of workpiece positioning devices. These devices enable precise and controlled positioning of workpieces within the machine's working area. This positioning capability, combined with the versatility of tooling options in the carousels, allows for flexible adaptation to a wide variety of punching requirements.

One application of stamping technology is the production of stamped parts intended for subsequent bending processes to create so-called stamped-bent parts. In this process, materials, typically in the form of sheet metal developments such as steel or aluminum sheets, are first processed by means of a stamping operation. Here, the starting material is placed in a stamping machine, where it is formed into predefined shapes by specifically configured stamping tools to produce the desired stamped part.

The punching process allows for precise and repeatable shapes to be cut from the sheet metal, forming the basis for subsequent processing steps. This process is particularly efficient and does not result in any thermal stress on the cut edges, thus increasing the quality of the final product. After the desired shape of the sheet metal has been achieved through the punching process, the bending process follows.

The subsequent bending process of a stamped part is an essential step in achieving three-dimensional contours. Stamped and bent parts are used particularly in the automotive industry, facade construction, and the aerospace industry, where high demands are placed on precision and structural integrity.

During the bending process, the stamped part is bent along a bending axis at a bending edge. The resulting bending radius is significantly influenced by various factors, including the material used, the material thickness, and the bending angle. This bending radius results from the material compression on the inside and the material expansion on the outside of the bending edge. In many manufacturing processes, it is important to keep this bending radius as small as possible to ensure optimal structural integrity of the workpiece.

Especially with thicker materials, material is often removed from the inside before the bending process. Material is removed from the bending edge to reduce compression. This can be achieved by creating V- or U-shaped grooves, typically with a milling disc. This milling disc is oriented perpendicular to the machining plane. The resulting material removal reduces the compression of the material on the inside of the bending edge, leading to a smaller bending radius.

The key advantage of this technique lies in the creation of a precisely defined bend along the milled groove, which increases the precision and reproducibility of the bending results. This allows for bends that exceed the technical limits of conventional bending machines, particularly in complex or accuracy-critical applications.

Reducing material compression on the inside of the bending edge is a crucial factor in achieving smaller bending radii.

To add a groove to a stamped part, it is typically placed in a machining machine, such as a milling machine or a gantry milling machine, after the stamping process. In this additional machining step, V- or U-groove milling is performed. Material is removed from the designated location on the bending edge to create the desired groove. This process allows for a targeted reduction of the material thickness on the inside of the bending edge, resulting in less compression of the material during the bending process.

The ability to achieve smaller bending radii is particularly important for applications that require high accuracy and specific geometric properties.

The grooves in the material also facilitate forming, which is often possible without bending machines and with minimal effort.

The use of a double V- or U-groove when processing thick sheet metal materials offers the significant advantage that a complete reversal of the sheet material can be achieved without the use of high force.

Traditional stamping machines designed to produce stamped parts that are subsequently processed into stamped and bent parts typically lack the necessary tooling for material removal, particularly cutting tools. This limitation necessitates a separate material removal step, lengthening the overall manufacturing process and potentially making it less efficient.

More efficient solutions that integrate material removal directly into the stamping process are therefore of great interest. Such integration could significantly accelerate the production of stamped and bent parts. The ability to perform both stamping and material removal in a single pass would significantly reduce overall production time.

Out of US5259100A A milling tool unit for a punching machine is known. The invention discloses an air-driven milling tool positioned in the upper turret of a turret punching press. The air-driven milling tool is used to form through holes and contours in the plate-shaped component being machined. The milling tool penetrates completely through the plate-shaped component being machined.

A significant disadvantage of the in US5259100A The revealed limitation of the milling tool unit is its dependence on a compressed air supply. This limitation leads to a lack of compatibility with punching machines that do not have their own compressed air supply. This dependence can significantly restrict the application range and flexibility of the milling unit in different manufacturing environments.

Another significant disadvantage is that the milling tool unit is not designed for creating specific material removals, such as milling grooves, especially V- or U-shaped grooves on bending edges for stamped and bent parts. Instead, the milling tool unit's focus is on contouring the plate-shaped component by milling through holes and external contours into the material.

The WO 2010/072326 A1 proposes a tool for a punching machine in which a tool insert is driven in an oscillating manner by means of a mechanism with a wave-shaped working surface in order to create markings.

Therefore, there is a need for a tool for use in a stamping machine and a machining device for a stamping machine, as well as a method using a stamping machine with a machining device for producing grooves in stamped parts.

The technical object of the present invention is to provide an alternative solution in the form of a tool for use in stamping machines. to provide a solution that, in combination with a machining device and a special method for generating grooves in stamped parts, serves to increase the efficiency of the machining process.

Furthermore, the provided tool or processing device should be integrable into common stamping machines and have the capability to produce precise and efficient grooves, especially V- or U-shaped grooves, on the bending edges of the stamped parts.

According to the invention, this problem is solved by a tool for use in a punching machine according to claim 1.

Advantageous embodiments of the tool according to the invention are specified in dependent claims 2 to 9. The wording of all claims is hereby explicitly incorporated into the description by reference.

• - ein Gehäuse mit einer Arbeitsöffnung;
• - eine Arbeitsspindel, die am Gehäuse mittels eines Lagerelementes um eine Antriebsachse drehbar unverlierbar gelagert ist;
• - ein Bearbeitungswerkzeug, welches drehfest an der Arbeitsspindel anodenbar ist;
• - eine Antriebseinheit;
• - eine Übertragungseinrichtung, die die Antriebseinheit mit der Arbeitsspindel verbindet,
• - ein Hilfswerkzeug,

wobei die Übertragungseinrichtung im Gehäuse angeordnet ist und
wobei das Bearbeitungswerkzeug aus der Arbeitsöffnung herausragt und einen Bearbeitungsbereich ausbildet;
wobei das Werkzeug in der Stanzmaschine anordenbar ist, um dem Hilfswerkzeug gegenüberzuliegen.The tool according to the invention for use in a punching machine comprises:

• - a housing with a working opening;
• - a working spindle which is mounted on the housing in a captive manner, rotatable about a drive axis, by means of a bearing element;
• - a machining tool which can be anodized while remaining rotationally fixed to the work spindle;
• - a drive unit;
• - a transmission device that connects the drive unit to the working spindle,
• - an auxiliary tool,

wherein the transmission device is arranged in the housing and
wherein the machining tool protrudes from the working opening and forms a machining area;
the tool can be arranged in the punching machine to be opposite the auxiliary tool.

The advantage here is that the housing with its working opening enables stable and precise guidance of the machining tool, resulting in increased machining accuracy. The rotatable and captive work spindle, which is attached to the housing by a bearing element, ensures a consistent and reliable transmission of drive forces to the machining tool.

Integrating the drive unit with the work spindle via a transmission device located in the housing results in a compact and efficient design that reduces space requirements and increases overall reliability.

The protrusion of the machining tool from the working opening to form a machining area is particularly advantageous for the precise production of grooves in stamped parts.

In a preferred embodiment, the drive unit of the tool according to the invention comprises an electric machine with a power supply unit.

The advantage here is that using an electric machine allows for precise and efficient control of the work spindle, resulting in improved performance and machining accuracy. A problem with conventional pneumatically operated tools is the supply of compressed air, which is energy-inefficient, particularly due to leaks caused by the supply system. Furthermore, dependence on compressed air sources can limit the flexibility of tool application, especially in environments where access to compressed air is restricted.

It is within the scope of the invention to design the electric machine as a permanent magnet excited synchronous machine in operating mode as a motor, in particular a brushless DC motor.

In a preferred embodiment of the electric machine as a brushless DC motor, the advantage arises that such a motor requires little maintenance. Additionally, thanks to reduced wear, it has a longer service life. A further advantage is the high power density of this embodiment.

It is particularly advantageous to design the electric machine as a reluctance motor, especially as a switched reluctance motor or synchronous reluctance motor, which is characterized by a robust construction without permanent magnets. This design offers high reliability and cost-efficiency because it is less susceptible to wear and allows for simple manufacturing.

In a preferred embodiment, the electrical machine of the tool according to the invention is designed as an external rotor motor.

The advantage here is that designing the electric machine as an external rotor motor allows for a compact and efficient arrangement within the housing. This results in increased power density. Another advantage of this design is... The improved thermal efficiency of the electric machine is due to the external rotor motor's design, which allows for more effective heat dissipation. This helps maintain a stable operating temperature and thus extends the service life of the electric machine.

In a preferred embodiment, the transmission device of the tool according to the invention has a gearbox.

The advantage here is that the integrated gearbox enables operating point adjustment by translating the rotary movements accordingly. Additionally, the gearbox allows the torque to be redirected to a different spatial axis, increasing the design flexibility of the drive solution. Furthermore, the gearbox improves the transmission and adaptation of torques and allows for fine-tuning of the machining tool's operating speed.

In a preferred embodiment, the transmission has a gear ratio i (input: output) of i= 1:1 to 1:20, preferably i= 1:1 to i=1:10.

In a further preferred embodiment, the transmission device is designed as a bevel gear transmission, with at least one bevel gear and at least one bevel pinion, and the bevel gear is preferably directly connected to the rotor, and the at least one bevel pinion is arranged on the end face of the working spindle, wherein the drive axis of the working spindle is horizontally aligned.

One advantage of this configuration is the preferred direct connection of the bevel gear to the rotor of the electric machine, which enables efficient and immediate transmission of the driving force. Furthermore, the bevel gear design leads to increased efficiency in power transmission. This design also contributes to a compact form factor and increased precision, thus improving the overall performance of the system.

In an alternative embodiment, the transmission device's gearbox is designed as a planetary gearbox.

The advantage here is the ability to achieve a high gear ratio in a compact installation space. This is particularly beneficial when space is limited and high power density is required. Distributing the load across multiple gears reduces wear and noise.

In another alternative embodiment, the transmission device's gearbox is designed as a cycloidal gearbox.

The compact design of cycloidal gearboxes is advantageous, as it saves space and allows for efficient use of available installation space. Another benefit is that cycloidal gearboxes can be designed with minimal backlash, meaning they exhibit little to no unwanted movement.

In a further advantageous embodiment, the tool according to the invention comprises a disc-shaped machining tool having a proximal and a distal region. The disc-shaped machining tool can be arranged in a rotationally fixed manner on the working spindle in the proximal region. Furthermore, the disc-shaped machining tool has cutting edges in the distal region, preferably straight cutting edges directed axially towards the center. These cutting edges are preferably replaceable.

The special design of the disc-shaped machining tool offers significant advantages, enabling high precision and efficiency in machining processes. Its rotationally fixed position in the proximal area of the work spindle ensures stable and precise tool guidance. This reduces vibrations and improves machining quality. The cutting edges, arranged distally and oriented axially towards the center, form a V-shaped geometry.

The ability to replace the cutting edges also increases the tool's flexibility and cost-effectiveness, as it can be easily adapted to different materials and machining requirements. Furthermore, this reduces maintenance costs, since only the cutting edges need to be replaced.

In an alternative, preferred embodiment, the machining tool is designed as a prism milling cutter.

The advantage here is that the geometric shape of the prism cutter creates a prism-shaped notch or groove on the workpiece. A further advantage is that this allows for the creation of very sharp edges with high precision.

In an alternative, preferred embodiment, the machining tool is designed as a half-round milling cutter.

The advantage here is that the geometric shape of the half-round milling cutter creates a rounded notch or groove on the workpiece. A further advantage is that the rounded shape promotes a more even distribution of stresses within the workpiece during machining. This helps to make the material less susceptible to internal stresses, especially when machining metal stamped and bent parts, thus preventing unwanted deformation or cracking during the bending process.

In a further advantageous embodiment of the tool according to the invention for use in a punching machine, the electric machine is designed as an internal rotor motor, wherein the rotor is connected to the work spindle via the transmission device. This is particularly advantageous because the arrangement of the motor as an internal rotor enables a compact design and thus allows it to be used in areas with limited installation space. In addition, the drive axis of the work spindle is vertically oriented, which enables efficient transmission of the motor power to the work spindle and thus increases machining efficiency.

Furthermore, a tool holder is mounted on the work spindle, allowing for flexible and rapid adaptation to various machining tools. This significantly increases the tool's versatility and enables efficient machining of different materials and geometries.

Furthermore, in an advantageous embodiment, the machining tool is shank-shaped, in particular an end mill, with a plurality of helically extending peripheral cutting edges, which can be arranged in the tool holder. The use of end mills with helical cutting edges offers the advantage of more uniform and low-vibration machining. This leads to a higher surface finish of the machined workpiece and a reduction in the load on the tool, which in turn extends the tool's service life.

Another advantageous feature of the tool is a spring-loaded wiper element that can be pressed into the housing. This wiper element has a scraping area that at least covers the machining area of the tool and releases it as soon as the wiper element is pressed into the housing. This feature is particularly beneficial because it ensures a clean machining surface by effectively removing chips and other residues from the machining area. Furthermore, the wiper element protects the internal mechanics of the tool from contamination and wear, resulting in a longer service life and reduced maintenance costs.

In an alternative embodiment of the tool, the stripping element is hollow cylindrical and has a chamfered surface on its end face.

The hollow cylindrical design of the wiper element allows for effective gripping of the machining tool during the machining process. The hollow cylindrical design also offers the advantage of reducing the wiper element's weight.

The beveled front surface of the wiper element allows the wiper element to be easily pressed down by feeding the workpiece to the beveled surface.

In a further advantageous embodiment of the tool according to the invention for punching machines, an integrated lubricant supply device is provided. This device ensures a continuous supply of lubricant. The advantage lies in the reduction of the thermal stress on the tool and the workpiece, which leads to a longer tool life and improved surface quality of the machined material. In addition, the lubrication reduces friction and wear and increases machining accuracy.

An additional advantageous embodiment includes a modular quick-change system for the machining tool. This quick-change system allows for the rapid exchange of different machining tools, which is particularly advantageous in manufacturing environments requiring high flexibility and minimal setup times.

Furthermore, in an alternative embodiment, the tool features an integrated sensor unit that monitors data such as rotational speed, temperature, and vibrations. This data is used for predictive maintenance to detect potential problems early and prevent failures, thereby increasing tool reliability and production efficiency.

In a further advantageous embodiment of the tool according to the invention, the housing includes a wireless data transmission unit for real-time monitoring and control. This enables a connection to a central control system of the punching machine or via mobile devices, resulting in greater flexibility and control over the machining process. cess as well as efficient data analysis and process optimization.

These designs increase the versatility, efficiency and ease of use of the tool for punching machines.

In a further advantageous embodiment of the tool according to the invention for punching machines, an integrated chip extraction system is provided. This extraction system is located directly below the machining area and removes chips and other machining residues during the machining process. The advantage here is that the chip extraction contributes to improved machining quality, as it prevents chips from scratching surfaces or disrupting the machining process. Additionally, the integrated chip extraction system offers a secondary benefit that is particularly important during longer machining processes: it cools the tool. This cooling effect helps to lower the temperature of the machining tool, which reduces its wear and thus extends its service life. Furthermore, a lower tool temperature can minimize the risk of heat damage to the machined material, leading to a further increase in product quality.

In an advantageous embodiment of the tool according to the invention for punching machines, the tool is designed so that it can be anodized in the upper region of the punching machine, where the punch is usually positioned. This arrangement makes it possible to position the tool directly with the movement of the punch towards the workpiece. The advantage of this configuration lies in the improved power transmission. Furthermore, this arrangement facilitates the integration of the tool into existing punching machines, since no extensive modifications are required in the lower region of the machine where the die is located.

In an alternative embodiment, the tool according to the invention can also be mounted in the lower area of the punching machine, at the position of the die. This arrangement is particularly advantageous when machining workpieces that require precise fixation or special support during the machining process. Positioning the tool in the lower area presses the workpiece against the stationary die, enabling more stable and precise machining.

In both cases – whether the tool is positioned in the upper or lower section of the punching machine – it is designed for easy exchange and adjustment. This offers high production flexibility and allows the tool to be quickly adapted to different materials and machining requirements.

In a further advantageous embodiment of the tool according to the invention for turret punching machines, the tool is designed for arrangement in the upper turret of the turret punching machine. Integrating the tool into the upper turret facilitates quick and automated tool changes, thereby increasing the flexibility and efficiency of the manufacturing process.

In an alternative advantageous embodiment, the tool according to the invention is provided for arrangement in the lower turret of a turret punching machine. This configuration is suitable for the precise application of material removal where precise control of the machining forces is required. Furthermore, the arrangement in the lower turret allows for easy collection of the removed material below the machining area of the tool.

In both configurations, in the upper and lower turrets, the tool is designed for quick and easy replacement. This provides flexibility for the production process.

In an alternative embodiment of the tool for use in a punching machine, the drive unit includes electronics that perform both control and regulation functions for the electric motor. This design of the electric motor offers significant advantages for the operation of the punching machine.

By regulating the speed of the electric machine, different machining requirements can be efficiently met. This is particularly advantageous for machining processes where high accuracy and reproducibility are essential. The electronics allow the electric machine to be quickly adjusted to the required operating parameters, resulting in increased machining efficiency and accuracy.

The electronic control functions also contribute to optimizing energy consumption. By adjusting the motor power to the actual requirements of the machining process, energy is saved, leading to a reduction in operating costs and a more environmentally friendly mode of operation.

Furthermore, the electronics offer improved diagnostic capabilities. By monitoring key operating parameters such as speed and load status of the electric motor, potential faults can be detected and rectified early. This contributes to increased reliability and longevity of the tool and reduces downtime, resulting in increased productivity.

In another alternative embodiment, the electronics could be configured to enable adaptive control. This adaptive control allows the electric machine to automatically adjust to different machining scenarios, such as changes in material hardness or thickness, or infeed depth.

In an alternative embodiment of the tool for use in a punching machine, the tool is designed as a battery-powered tool. Using a battery as the energy source increases the tool's mobility and flexibility. This allows the tool to be used in punching machines where there is no separate power supply for the tool. Independence from a fixed power supply also facilitates the tool's use in turret punching presses, where rapid tool repositioning is required.

Equipping the tool with modern, high-performance batteries, such as lithium-ion batteries, enables long operating times and high energy efficiency. These batteries have a high energy density and can be recharged quickly, which increases the tool's productivity and efficiency. Furthermore, they have a low self-discharge rate, allowing for extended storage without significant energy loss.

In an alternative embodiment of the tool for use in a punching machine, the integration of supercapacitors (supercaps) is provided. These have the advantage of enabling rapid energy absorption and release, which is particularly beneficial in application scenarios with high power peaks. Supercaps also offer high cycle stability and perform well under a wide variety of operating conditions, thus improving the overall performance and reliability of the tool.

In another alternative embodiment as a battery-powered tool, the tool has a function to display the battery charge level, which allows the operator to easily monitor the battery charge level.

According to the invention, the aforementioned problem is also solved by a processing device of a punching machine, wherein the punching machine has at least one die holder and one punch holder, according to claim 10.

• - ein erfindungsgemäßes Werkzeug auf;
• - wobei das Hilfswerkzeug einen zylinderförmigen Grundkörper aufweist, welcher an einer ersten Stirnseite ein Kopplungselement aufweist;
• - ein Rollkörper auf;

wobei der zylinderförmige Grundkörper an der zweiten Stirnseite eine Einformung aufweist, in welcher der Rollkörper drehbar gelagert ist und wobei ein Teil des Rollkörpers die Stirnfläche überragt; wobei das Werkzeug angeordnet ist, um dem Hilfswerkzeug gegenüberzuliegen. Bevorzugt ist das Werkzeug in der Matrizenaufnahme der Stanzmaschine angeordnet und das Hilfswerkzeug in der Stempelaufnahme der Stanzmaschine angeordnet.The machining device according to the invention for a punching machine with at least one die holder and one punch holder has

• - a tool according to the invention;
• - wherein the auxiliary tool has a cylindrical base body which has a coupling element on a first end face;
• - a rolling object on;

wherein the cylindrical base body has a recess on its second end face in which the rolling element is rotatably mounted and wherein a portion of the rolling element projects beyond the end face; wherein the tool is arranged to be opposite the auxiliary tool. Preferably, the tool is arranged in the die holder of the stamping machine and the auxiliary tool is arranged in the punch holder of the stamping machine.

In the machining device according to the invention, the tool according to the invention is implemented together with an auxiliary tool. The auxiliary tool serves to position and guide the workpiece in the machining area and ensures a uniform force distribution during the machining process of the tool. The end-face coupling element enables simple arrangement of the auxiliary tool in a holder of the punching machine.

In an advantageous embodiment, the coupling element has a pin. In this embodiment, the auxiliary tool is fixed using a suitable slot. This type of connection is particularly robust because it allows for high alignment accuracy and offers little room for movement.

On the opposite end face of the cylindrical base body is a recess in which the rolling element is rotatably mounted. Part of this rolling element projects beyond the end face. This configuration enables effective interaction between the auxiliary tool and the tool according to the invention during the stamping process.

In an advantageous embodiment, the rolling element is designed as a steel ball, ceramic ball, or plastic ball. The advantage here is that each of these ball types possesses specific properties suitable for different applications and materials. The spherical shape also enables virtually frictionless and uniform movement, as contact with the workpiece surface is minimal and constant. This results in a uniform force transmission to the workpiece. Furthermore, the spherical shape minimizes wear, both on the rolling element itself and on the surfaces with which it comes into contact.

In an advantageous embodiment, the rolling element is designed as a cylindrical roller, needle roller, or barrel roller. The advantage here is that each of these roller shapes possesses properties that are suitable for different applications and materials.

Cylindrical rollers offer a larger contact area and improved load distribution, which is advantageous for linear movements. Needle rollers have a small footprint, making them particularly suitable for confined spaces. Barrel rollers are suitable for applications where misalignment needs to be compensated for.

The tool according to the invention is preferably arranged in the die holder of the punching machine, while the auxiliary tool is placed in the punch holder. This arrangement ensures that the tool and the auxiliary tool are opposite each other during the machining process. When the auxiliary tool is moved towards the tool and positioned on the workpiece, the rolling element, which projects beyond the end face of the cylindrical base body, rolls along the surface of the workpiece as the workpiece moves during the machining process and exerts a force on the workpiece, preventing it from shifting in an unwanted direction during the machining process.

The advantage of this arrangement lies in the precise machining of the workpiece it enables. A further advantage of this configuration is the prevention of unwanted movements or shifts of the workpiece during the machining process. The roller helps to hold the workpiece in place, which is particularly crucial when removing material with a large depth of cut. This stable positioning using an auxiliary tool ensures consistent quality of the machined workpiece and minimizes the risk of errors or damage.

In machining processes with large depths of cut, the forces exerted on the workpiece can be high, so without appropriate countermeasures there is a risk of the workpiece moving uncontrollably. This can lead to dangerous situations in which workpieces could be thrown around and injure people near the machine. The auxiliary tool, with its rolling element that runs along the surface of the workpiece during the machining process and exerts a stabilizing force, securely positions and holds the workpiece. This stable fixation thus increases the safety of operators and other people in the vicinity of the punching machine.

According to the invention, the aforementioned problem is also solved by a method using a punching machine with at least one die holder and a punch holder with a previously described processing device according to claim 11.

• - bei dem das Hilfswerkzeug der Bearbeitungsvorrichtung entlang einer Hubachse mit einer Hubantriebsvorrichtung in Richtung auf ein mit dem Hilfswerkzeug zu stützendes Werkstück positionierbar ist,
• - bei dem das Werkzeug der Bearbeitungsvorrichtung, welches zum Hilfswerkzeug hin ausgerichtet ist, entlang einer Zustellachse positionierbar ist, wobei die Zustellachse dieselbe Orientierung wie die Hubachse aufweist, und wobei entlang einer Positionierachse, die senkrecht zur Hubachse ausgerichtet ist, ein Werkstück verfahrbar ist, weist folgende Verfahrensschritte auf:
  1. A) Bereitstellen eines Werkstückes;
  2. B) Zuführen des Werkstückes entlang der Positionierachse in Richtung des Werkzeuges;
  3. C) Hubbewegung des Hilfswerkzeuges entlang der Hubachse, so dass das Werkstück mit einer Kraft beaufschlagt und fixiert wird;
  4. D) Niederdrücken des Abstreifelements und Bearbeitung des Werkstücks im mittels Werkzeugs durch eine relativ zur Zustellachse entlang der Positionierachse erfolgende Bewegung des Werkstückes.

The inventive method uses a punching machine with at least one die holder and a punch holder with an inventive machining device for machining, in particular for milling or cutting, preferably plate-like workpieces, for example sheet metal.

• - in which the auxiliary tool of the machining device can be positioned along a lifting axis with a lifting drive device in the direction of a workpiece to be supported by the auxiliary tool,
• - in which the tool of the machining device, which is oriented towards the auxiliary tool, can be positioned along a feed axis, wherein the feed axis has the same orientation as the lifting axis, and wherein a workpiece can be moved along a positioning axis that is oriented perpendicular to the lifting axis, has the following process steps:
  1. A) Providing a workpiece;
  2. B) Feeding the workpiece along the positioning axis in the direction of the tool;
  3. C) Lifting movement of the auxiliary tool along the lifting axis, so that the workpiece is subjected to a force and fixed;
  4. D) Pressing down the stripping element and machining the workpiece by means of a tool by moving the workpiece relative to the feed axis along the positioning axis.

The coordination of the lifting movements along the lifting axis and the feed axis allows for precise positioning of the workpiece and the tool, resulting in improved machining precision. This method is particularly advantageous for straight cuts or milling operations.

The following description refers to the accompanying figures, which serve to illustrate exemplary embodiments of the invention. These figures are not to be considered limiting, but merely represent certain aspects and features of the invention. In the drawings, the figures show specific elements, components, and arrangements that are essential for understanding the invention. Identical reference numerals represent elements with the same or similar effects.

• 1 ein Ausführungsbeispiel eines erfindungsgemäßen Werkzeuges in Schnittdarstellung zur Verwendung in einer Stanzmaschine;
• 2 ein Ausführungsbeispiel einer erfindungsgemäßen Bearbeitungsvorrichtung innerhalb einer Stanzmaschine;
• 3a-3d ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens.

It shows:

• 1 an embodiment of a tool according to the invention in sectional view for use in a punching machine;
• 2 an embodiment of a processing device according to the invention within a punching machine;
• 3a-3d an embodiment of the method according to the invention.

1 Figure 1 shows an embodiment of a tool 1 according to the invention for use in a punching machine in a sectional view. 1 The described embodiment features a two-part cylindrical housing with a housing body 2 and a cover 16. The housing body 2 is open at one end, and the cover 16 covers it to enclose a cavity. The cover 16 has a circular working opening.

The drive unit in this embodiment is designed as an external rotor electric machine. This electric machine comprises an annular rotor 4 and a cylindrical stator 5. The rotor 4 is arranged around the stator 5.

Inside the housing is a transmission device designed as a bevel gear unit. This unit consists of a bevel gear 6 and a bevel pinion. The bevel gear 6 is positioned within a gear housing 7, which is directly connected to the rotor 4 of the electric machine. Both the drive unit and the transmission device are located within the housing. The stator 5 of the electric machine is centrally mounted and connected to the housing. The gear housing 7 is arranged concentrically around the stator 5. Furthermore, the working opening of the cover 16 is oriented so that it is positioned centrally to the housing body. The gear housing 7 itself is rotatably mounted within the housing body.

Furthermore, a work spindle 8 is integrated into the tool, to the end face of which the bevel pinion is attached. A machining tool 9, in this embodiment a prism cutter, is also captive mounted on the work spindle 8. Bearing elements are provided to support the work spindle 8.

The housing has formed bearing surfaces for supporting the work spindle 8. The work spindle 8 is horizontally oriented so that the machining tool 9 forms a machining area BA from the working opening. The bevel pinion mounted on the end face of the work spindle 8 engages with the bevel gear 6 located in the gear housing 7.

The tool 1 has a spring-mounted wiper element 3. This wiper element 3 is arranged within the cover 16. The cover 16 has a recess at the edge of the working opening to accommodate the wiper element 3. Additionally, the cover 16 has recesses for spring elements, which are not shown here for clarity.

The scraper element 3 itself consists of a hollow cylindrical base body with contours leading obliquely outwards on one end face.

When the electric machine is activated by electrical energy, the rotor 4, the gear housing 7, and the connected bevel gear 6 begin to rotate. This movement is transmitted to the bevel pinion and thus to the work spindle 8, resulting in a rotational movement of the machining tool 9. The forces generated during this process are absorbed by the bearings of the work spindle 8 in the housing, ensuring smooth operation of the work spindle 8.

In an alternative embodiment, a planetary gear unit replaces the bevel gear unit. Here, the ring gear of the planetary gear unit is connected to the gearbox housing, while the sun gear is connected to the work spindle. In this variant, the work spindle is vertically oriented and carries a tool holder for, for example, a V-slot cutter.

Another embodiment, shown in 2 Figure 1 shows an embodiment of a machining device according to the invention within a punching machine 10. This device includes the tool 1 described above as well as a Additional auxiliary tool 11. The auxiliary tool 11 has a cylindrical base body with a mushroom-shaped coupling element on one end face and a recess on the other end face in which a captive rolling element 12, in this case a roller, is embedded. The tool 1 is arranged in the die holder 13 and the auxiliary tool 11 in the punch holder 14 of the punching machine 10, facing each other.

In alternative embodiments, the auxiliary tool 11 can also be positioned in the die holder 13 and the tool 1 in the punch holder 14. Another variant provides for the use of the machining device in a turret punch press, with the auxiliary tool 11 being placed in the upper and the tool 1 in the lower carousel of the turret.

3 This represents an embodiment of the method according to the invention, which uses a punching machine with at least one die holder and one punch holder, as well as the described processing device. This method is particularly suitable for processing plate-shaped workpieces, such as sheet metal, by milling or cutting.

The auxiliary tool 11 of the machining device can be positioned along a lifting axis HA by means of a lifting drive device to support the workpiece 15. Parallel to this, the tool 1 can be aligned along a feed axis ZA, which has the same orientation as the lifting axis HA of the auxiliary tool 11. A workpiece 15 can be fed along a positioning axis PA perpendicular to this lifting axis HA.

1. A) Bereitstellen eines Werkstückes 15; (Teilabbildung 3a)
2. B) Zuführen des Werkstückes 15 entlang der Positionierachse PA in Richtung des Werkzeuges 1; (Teilabbildung 3b)
3. C) Hubbewegung des Hilfswerkzeuges 11 entlang der Hubachse HA, so dass das Werkstück 15 mit einer Kraft beaufschlagt und fixiert wird; (Teilabbildung 3c)
4. D) Niederdrücken des Abstreifelements 3 und Bearbeitung des Werkstücks 15 mittels Werkzeugs 1 durch eine relativ zur Zustellachse ZA entlang der Positionierachse PA erfolgende Bewegung des Werkstückes 15; (Teilabbildung 3d).

The procedure comprises the following steps:

1. A) Providing a workpiece 15; (partial illustration 3a)
2. B) Feeding the workpiece 15 along the positioning axis PA in the direction of the tool 1; (partial figure 3b)
3. C) Lifting movement of the auxiliary tool 11 along the lifting axis HA, so that the workpiece 15 is subjected to a force and fixed; (partial figure 3c)
4. D) Pressing down the stripping element 3 and machining the workpiece 15 using tool 1 by moving the workpiece 15 relative to the feed axis ZA along the positioning axis PA; (partial figure 3d).

Reference symbol list

1

Tool

2

Housing body

3

wiper element

4

rotor

5

stator

6

bevel gear

7

Gearbox shell

8

work spindle

9

Machining tool

10

Punching machine

11

Auxiliary tool

12

rolling body

13

Matrix recording

14

Stamp recording

15

workpiece

16

cover

BA

Processing area

HA

Lifting axle

PA

Positioning axis

ZA

Delivery axle

Claims (11)

Tool (1) for use in a punching machine (10) comprising: - a housing with a working opening; - a working spindle (8) which is rotatably mounted on the housing by means of a bearing element about a drive axis; - a machining tool (9) which can be arranged non-rotatably on the working spindle (8); - a drive unit; - a transmission device which connects the drive unit to the working spindle (8), the transmission device being arranged in the housing and the machining tool (9) projecting from the working opening and forming a machining area (BA); - an auxiliary tool (11); the tool (1) being arranged in the punching machine (10) to be opposite the auxiliary tool (11). Tool (1) after Claim 1 , characterized in that the drive unit comprises an electric machine with a power supply device. Tool (1) after Claim 2 characterized in that the electric machine is designed as an external rotor motor. Tool (1) according to one of the preceding claims, characterized in that the transmission device has a gearbox. Tool (1) after Claim 3 and 4 , characterized in that the transmission device is designed as a bevel gear transmission, with at least one bevel gear (6) and with at least one bevel pinion, and that the bevel gear (6) is preferably directly connected to the rotor (4), and that the at least one bevel pinion is arranged on the end face of the working spindle (8), wherein the drive axis of the working spindle (8) is horizontally oriented. Tool (1) according to one of the preceding claims, characterized in that the machining tool (9) is disc-shaped and has a proximal and a distal region, that the disc-shaped machining tool (9) can be arranged rotationally fixed in the proximal region on the working spindle (8), and that the disc-shaped machining tool (9) has cutting edges in the distal region, preferably straight cutting edges directed axially towards the center, preferably replaceable cutting edges. Tool (1) after Claim 2 , characterized in that the electric machine is designed as an internal rotor motor, and that the rotor (4) is connected to the transmission device, to the working spindle (8), wherein the drive axis of the working spindle (8) is vertically aligned, and that a machining tool holder is arranged on the working spindle (8). Tool (1) after Claim 7 , characterized in that the machining tool (9) is shaft-shaped, in particular a shank cutter, with a plurality of helically extending peripheral cutting edges, which can be arranged in the machining tool holder. Tool (1) according to one of the preceding claims, characterized in that a spring-mounted scraper element (3) that can be pressed into the housing has a scraper area that at least covers the machining area of the machining tool (9) and releases the machining area as soon as the scraper element (3) is pressed into the housing. Machining device for a punching machine (10) with at least one die holder (13) and one punch holder (14) with - a tool (1) according to one of the Claims 1 until 9 ; - wherein the auxiliary tool (11) has a cylindrical base body which has a coupling element on a first end face; - a rolling body (12); wherein the cylindrical base body has a recess on the second end face in which the rolling body (12) is rotatably mounted and wherein a part of the rolling body (12) projects beyond the end face; wherein the tool (1) is arranged to be opposite the auxiliary tool (11), preferably the tool (1) is arranged in the die holder (13) of the punching machine (10) and the auxiliary tool (11) is arranged in the punch holder (14) of the punching machine (10). Method using a punching machine (10) with at least one die holder (13) and a punch holder (14), with a processing device according to Claim 10 for machining, in particular for milling or cutting preferably plate-like workpieces (15), for example sheet metal - in which the auxiliary tool (11) of the _machining device is positionable along a lifting axis (HA) with a lifting drive device in the direction of a workpiece (15) to be supported by the auxiliary tool (11), - in which the tool (1) of the machining device, which is oriented towards the auxiliary tool (11), is positionable along a feed axis (ZA), wherein the feed axis (ZA) has the same orientation as the lifting axis (HA), and wherein a workpiece (15) is movable along a positioning axis (PA), which is oriented perpendicular to the lifting axis (HA), with the following process steps: A) providing a workpiece (15); B) feeding the workpiece (15) along the positioning axis (PA) in the direction of the tool (1); C) Lifting movement of the auxiliary tool (11) along the lifting axis (HA) so that the workpiece (15) is subjected to a force and fixed; D) Pressing down the stripping element (3) and machining the workpiece (15) by means of tool (1) by a movement of the workpiece (15) relative to the feed axis (ZA) along the positioning axis (PA).