EP3302842B1 - Method for adjusting a forming portion of a bending tool - Google Patents

Description

The invention relates to a method for adjusting a mold section of a bending tool in a bending press which has a press drive. The invention also relates to a bending press and the use of a bending tool in a method for adjusting a shaped section of a bending tool.

the DE3235775A1 discloses a lower tool for a press brake for bending sheet metal. A tool holder into which a folding tool can be inserted is arranged on a lower beam. The tool holder is designed as a tool holder divided in the longitudinal direction of the handlebar. Both tool holder halves can be adjusted transversely to the longitudinal direction of the handle. An exchangeable folding cheek can be inserted into each tool holder half. The adjustment takes place via an adjusting spindle.

the EP0444169B1 discloses a tool for press brakes with a die which has two half dies arranged on both sides of the bending plane. By shifting the half dies perpendicular to the pressing direction, the die shape can be widened or narrowed.

the WO0176784A1 discloses a tool with two mutually displaceable jaws for adjusting the die size. As in the two previous publications, the shift takes place in a direction perpendicular to the pressing direction.

the WO2010 / 099559A1 forms the basis for the preamble of claims 1 and 8.

The disadvantage of such constructions is that changing the die width of a bending tool requires a separate actuation mechanism that has to be operated manually by an operator. In a bending press in particular, the space for such manipulations is very narrow and the view is severely restricted, which results in an operation that is costly for the operator and often inaccurate adjustment.

The aim of the invention is to solve these problems and to simplify the adjustment of a mold section of a bending tool. In addition to an increase in the adjustment accuracy, the adjustment process should be able to be automated. The adjustment should be possible within the bending press, preferably even during a bending process.

This goal is achieved with a method mentioned at the outset in that the adjustment of the mold section of the bending tool is carried out by the press drive and preferably by an additional travel drive (integrated in the bending press) which, in the bending press, creates a relative movement between the bending tool with the mold section to be adjusted and effected by an opposing bending tool, in particular in a direction transverse to the pressing direction (the bending press).

The adjustment of the mold section by the press drive and preferably by an additional travel drive integrated in the bending press is based on the idea of bringing about the adjustment movement on the mold section by a relative movement of two opposing tools or tool holders. The press drive and preferably the additional travel drive can thus simultaneously also act as an adjustment drive for the mold section. No separate drive is therefore required for the adjustment process. The adjustment can take place automatically. A great advantage is that the adjustment process can take place on a workpiece during the bending process. This means that complex bending processes can be carried out on a workpiece without having to change tools.

The press drive is the drive that causes opposing tools to be moved towards each other and to shape or bend a workpiece arranged between them. The direction in which the opposing tools move towards one another corresponds to the pressing direction of the bending press. In addition to the press drive, the bending press can also have a travel drive in order to position the tools transversely to the pressing direction. This displacement drive can also be used to adjust the shaped section of a bending tool (inserted into the tool holder). According to the relative direction of movement caused by the movement drive, a bending tool can act (mechanically) on the mold section of another bending tool and thereby move a movable molded part.

The bending tool and the bending press are designed in particular for bending flat workpieces, in particular sheet metal.

A preferred embodiment is characterized in that the adjustment of the mold section takes place in that opposing tool holders of the bending press, preferably an upper tool holder and a lower tool holder, are moved relative to one another, in particular towards one another, by the press drive and preferably by the additional displacement drive Bending tool with the shaped section to be adjusted is held by one of the tool holders and is subjected to pressure via the opposite tool holder. According to the invention, the opposite tool holder or a bending tool inserted in the opposite tool holder or a workpiece rests against the shaped section to be adjusted. The bending tool to be adjusted is inserted in the tool holder, i.e. it is already in the position required for the bending process. The shaped section of this bending tool can now be adjusted without having to be removed from the tool holder. The adjustment takes place (directly or indirectly) through the relative movement of the opposite tool holder.

A preferred embodiment is characterized in that the adjustment of the shaped section of the bending tool is carried out during a bending process on a workpiece, the workpiece being arranged in the bending press during the adjustment of the shaped section, preferably between the bending tool with the shaped section to be adjusted and an opposing one The bending tool is clamped. As already mentioned, this allows complex bending operations to be carried out without the need to use (and constantly change) multiple tools with differently shaped mold sections.

A preferred embodiment is characterized in that the mold section of the bending tool forms a die and the adjustment of the mold section includes an adjustment of the die width of the die. The shape of a workpiece, especially at the bending edge, can be influenced and varied in a targeted manner. The bending tool forming the die is preferably used in the lower tool holder. The upper tool holder can now adjust the die, preferably via an upper tool inserted therein.

The invention is characterized in that the bending tool has a holding section for inserting the bending tool into a tool holder of the bending press and that the forming section of the bending tool comprises at least one molded part that can be moved relative to the holding section, with at least one molded part relative to the press drive when the mold section is adjusted Holding section is preferably moved linearly. The bending tool is fixed in the tool holder via the holding section. However, the molded part remains adjustable - regardless of the fixation of the holding section by the tool holder. According to the invention, the mold section with the movable mold part (s) and the holding section are formed on opposite sides of the bending tool. Thus, the shaped section can be formed on the upper side of the bending tool and the holding section can be formed on the lower side of the bending tool.

A preferred embodiment is characterized in that the adjustment of the mold section comprises a displacement of the at least one mold part and / or a pivoting of the at least one mold part and / or an inclination of the at least one mold part relative to the pressing direction. These variants allow a large number of possible manipulations on a molded section with appropriately mounted molded parts, which results in new and diverse possibilities for planning and performing bending processes. In particular, the molded part can be mounted rotatably and / or displaceably (linearly or along a curved guide track).

The invention is characterized in that the bending tool comprises a preferably hydraulic locking device which interacts with the mold section and which, in the locked state, secures the mold section against displacement. The adjustment of the mold section can only take place when the locking device is released. In the locked state, it is ensured that the mold section does not change. The integration of such a locking device on or in the bending tool represents an embodiment according to the invention, because no special measures have to be taken to lock the shaped section.

A preferred embodiment is characterized in that the locking device is released in that the press drive moves opposing tool holders of the bending press towards one another, the bending tool with the one to be adjusted Mold section is pressurized, and that the locking device is transferred to the locked state after the desired position of the mold section has been reached.

The object mentioned at the beginning is also achieved with a bending tool for a bending press according to claim 8, the bending tool having a holding section for inserting the bending tool into a tool holder of a bending press and a forming section for shaping a workpiece. In this case, the mold section comprises at least one mold part that can be moved relative to the holding section.

This configuration of a bending tool enables the mold section to be adjusted by means of the press drive (mentioned above) and preferably an additional travel drive. The bending tool is designed with its shaped section to be adjusted according to a method according to the invention. As already mentioned, the mold section with the movable mold part (s) and the holding section are formed on opposite sides of the bending tool so that the adjustment process of the mold section is not impaired by holding or fixing the bending tool by a tool holder. The shaped section represents the workpiece-side section and the holding section represents the section of the bending tool facing away from the workpiece.

The extension of the bending tool in a direction running from the workpiece-side area of the mold section to the holding section can be varied according to the invention. Such a (height) change is accompanied by an adjustment of the mold section.

The invention is characterized in that the mold section can be adjusted by applying pressure to the bending tool in a direction running from the workpiece-side region of the mold section to the holding section. Such pressurization is carried out by the press drive.

A preferred embodiment is characterized in that a pressing direction is predetermined by the forming section of the bending tool (ie the shape of the forming section defines a pressing direction) and that the extension of the bending tool in the pressing direction is larger in a first position of the mold section than in a second position of the mold section. In this embodiment, the adjustment of the mold section is accompanied by a change in the height of the bending tool, ie the bending tool can be compressed or collapsed. A change in the shape of the shape section (for example a change in the die width) can also be linked to this height adjustability of the bending tool. In the case of a die, for example, the pressing direction is defined by a direction which is perpendicular to the plane in which the die opening of the die lies. In the case of a punch, the pressing direction is predetermined by the direction in which the punch is pointing.

The invention is characterized in that the bending tool comprises a preferably hydraulic locking device which cooperates with the mold section and which, in the locked state, secures the mold section against adjustment (in at least one adjustment direction), the locking device preferably being arranged inside the bending tool. The locking device ensures reliable locking of the molded section or its molded part (s) in at least one, preferably both (opposite) adjustment direction (s); in particular, it can also prevent a return movement of the mold section. The locking device can be transferred from a released to a locked state, and vice versa. Inside the bending tool, the locking device is protected from external influences. In the immediate vicinity of the shaped section, it can also be designed to be very space-saving. The integration of the locking device inside the bending tool enables the construction of compact and easy-to-use tools.

A preferred embodiment is characterized in that the locking device has a drive, in particular an actuator, a motor, a cylinder or the like, by means of which the locking device can be converted into the locked state and / or into the released state. The release and locking can therefore take place automatically, preferably by a controller. The handling of an operator in the already very narrow (danger) area is not necessary here.

A preferred embodiment is characterized in that the bending tool has an electrical and / or electromagnetic interface which is connected to the drive of the locking device, the interface preferably being on the holding section of the Bending tool is arranged. The drive is supplied with energy via the interface. A (preferably rechargeable) electrical energy store, in particular a battery or an accumulator, can also be connected between the interface and the drive. While the tool is in use, the drive can draw energy from the energy store.

A preferred embodiment is characterized in that the locking device has a pressure medium channel which is divided into a first pressure medium area and a second pressure medium area by an actuatable valve, preferably by a releasable check valve, the first pressure medium area being coupled to the at least one molded part. The pressure medium channel is filled with an incompressible pressure medium, preferably hydraulic oil. By this measure, a stepless adjustment or a locking of the mold section can take place in any position. When the valve is closed, the mold section remains locked in the first pressure medium area due to the incompressible pressure medium. When the valve is open, the pressure medium can flow from the first pressure medium area into the second pressure medium area, the shaped section now also being adjustable. Said valve can be actuated by the above-mentioned drive.

The valve can be of any type in order to decouple the pressure medium areas from one another in terms of pressure. Examples would be a check valve (spring-loaded or unloaded), a ball valve valve, slide valve, and the like. The valve could also be actuated externally.

"Pressure medium channel" is understood to mean any device that can accommodate pressure medium (also under pressure). The pressure medium channel can in particular comprise a pressure medium line, a pressure medium pipe and / or a cylinder in which, for example, an element with a piston surface can be displaced. In addition, the pressure medium channel can have a constant or variable cross section along its extension. The course of the pressure medium channel can also be designed as desired, in particular it can have straight and curved sections.

Instead of (or in addition to) a hydraulic locking device, a mechanical locking device could also be used. This would represent a mechanical locking of the at least one molded part. An integrated drive could convert the locking into the locked (or locked) and unlocked (or released) state.

A preferred embodiment is characterized in that the mold section has at least two movable mold parts which interact with the same locking device, in particular are coupled to one another by a common pressure medium channel. The adjustment and also resetting of the molded parts can thereby take place synchronously. Also, only one locking device is required.

A preferred embodiment is characterized in that the bending tool has a restoring device, in particular a restoring spring, for restoring the at least one molded part. As a result of this measure, the (previously adjusted) molded part can already be brought into its original position within the bending press and also when the bending tool is in the inserted state. The molded part can thus be moved in opposite directions.

A preferred embodiment is characterized in that the restoring device comprises an energy store, in particular a spring, which can be acted upon by an adjustment movement of the at least one molded part. This particularly elegant solution does not require an active drive for the return movement.

A preferred embodiment is characterized in that the resetting device cooperates with the locking device, preferably is coupled to the second pressure medium area of the pressure medium channel. To reset, only the locking device has to be actuated.

A preferred embodiment is characterized in that the holding section is formed on a block, the at least one molded part being movably supported in or on the block, preferably linearly guided. The mold section with the movable mold part (s) and the holding section are preferably formed on opposite sides of the bending tool. Thus, the shaped section can be formed on the upper side of the bending tool and the holding section can be formed on the lower side of the bending tool. A block extends between the holding section and the mold section, in which, for example, a locking device (described below) can be integrated.

• zumindest einen Abschnitt des Druckmittelkanals (der Sperreinrichtung) bilden,
• und/oder eine Führung für den zumindest einen Formteil oder einen mit diesem zusammenwirkenden Übertragungsteil bilden,
• und/oder ein Ventil (der Sperreinrichtung) beherbergen
• und/oder einen Antrieb beherbergen
• und/oder einen Energiespeicher beherbergen
• und/oder eine Steuereinrichtung beherbergen.

At least one bore is preferably formed in the block (made of solid material). The hole (s) can / can

• form at least a section of the pressure medium channel (the locking device),
• and / or form a guide for the at least one molded part or a transmission part interacting with it,
• and / or house a valve (of the blocking device)
• and / or accommodate a drive
• and / or house an energy store
• and / or accommodate a control device.

Some of the listed components are only explained in more detail below.

A preferred embodiment is characterized in that the shaped section of the bending tool forms a die whose die width is adjustable. This results in a wide range of bending options with one and the same tool. The die is preferably elongate and has a substantially constant cross section along its length.

A preferred embodiment is characterized in that the mold section of the bending tool comprises two linearly movable mold parts which form the die jaws of the die, the directions of movement of the two mold parts running in a V-shape. Applying pressure in the pressing direction or transversely to the plane in which the die opening is located causes the die width to increase. The distance between the end of the mold section on the workpiece side and the holding section formed on the opposite side of the bending tool can thus be changed. A compression of the bending tool goes hand in hand with an enlargement of the die width.

A preferred embodiment is characterized in that the bending tool has a spacer, preferably in the form of a web, by means of which the die jaws are spaced from one another. Such a spacer also forms a type of guide through which the die jaws are guided in a defined path.

A preferred embodiment is characterized in that the at least one molded part can be moved between two stop positions, one stop position corresponding to a fully extended position of the molded part and the other stop position corresponding to a fully retracted position of the molded part. For this purpose (in particular protruding) stops can be provided which also prevent a molded part from falling off the rest of the bending tool.

The following embodiments relate to bending tools which have at least one drive, the drive preferably being arranged in the interior of the bending tool. One example (the drive of the locking device) has already been described above. The drive is integrated in the bending tool or forms a unit with it. By integrating a drive in a bending tool, the functionalities of the bending tool can be expanded. Manipulations of the bending tool no longer have to be done manually or by external actuation. The automation associated with the integration of a drive leads to a significant simplification and shortening of work processes.

The drive includes an energy supply interface, e.g. an electrical connection. In particular, the drive is an active drive, i.e. it can only be activated when electrical energy, in particular, is supplied. The drive can be controlled either directly via the power supply interface or via a separate control input.

The drive can - depending on its function in the bending tool - be an actuating drive (e.g. in the sense of an actuator), an adjustment drive or a travel drive. The drive can be switched between (e.g. two) discrete (end) positions or operated continuously. It can in particular be designed as a motor (rotary or linear motor), lifting magnet, cylinder drive, pump drive, locking actuation and / or valve actuation. The bending tool can have at least two drives, the functionalities of which are different.

The drive is preferably accommodated in a bore extending in the bending tool, in particular in a block made of solid material. The drive can be designed in a correspondingly space-saving manner, in particular as a miniature drive.

A preferred embodiment is characterized in that a drive for the bending tool is a travel drive for moving the bending tool in a tool holder or in a tool holder. This measure makes the bending tool self-propelled. An external movement device is therefore no longer absolutely necessary. This measure enables the bending tool to be automatically and precisely positioned by means of the tool's own drive.

A preferred embodiment is characterized in that the bending tool has at least one drive part that can be moved by the drive, in particular a wheel, a chain, a caterpillar or a revolving belt, with at least a portion of the drive part preferably being located on an outside of the bending tool. The moving drive part interacts with a stationary (driving) surface, e.g. the tool holder, which causes the bending tool to move.

A preferred embodiment is characterized in that the bending tool has at least one locking device for locking the bending tool on or in a tool holder and that a drive of the bending tool interacts with the locking device, the locking device being moved into the locked state and / or into the dissolved state is transferable. In this embodiment, the locking of the bending tool on the tool holder is automated. The drive encompassed by the bending tool ensures reliable actuation and facilitates and shortens work processes associated with the bending process.

A preferred embodiment is characterized in that the bending tool has an electrical, preferably rechargeable energy store (eg battery or accumulator) which is connected to the drive. The energy store is preferably arranged inside the bending tool and enables the drive to be activated even in situations in which there is no external energy supply. This can be the case, for example, when the bending tool is used in the tool holder of a bending press. When the tool has been returned to the tool magazine after a bending process, the energy store can be recharged there for the next use.

A preferred embodiment is characterized in that the bending tool comprises a control device by which the drive can be controlled. This enables targeted control in terms of time, direction and force.

A preferred embodiment is characterized in that the bending tool has a preferably wireless control interface which is connected to the control device. As a result, the drive of the bending tool can be controlled reliably and, in particular, also by radio.

A preferred embodiment is characterized in that the drive is an electromagnetic drive, in particular a motor or an electromagnet, or a hydraulic drive, in particular a cylinder-piston unit or a pump drive.

A preferred embodiment is characterized in that the bending tool has an electrical and / or electromagnetic interface which is connected to the drive and / or to an electrical energy store, the interface preferably being arranged on the holding section of the bending tool. The drive is supplied with energy via the interface. A (preferably rechargeable) electrical energy store, in particular a battery or an accumulator, can also be connected between the interface and the drive. While the tool is in use, the drive can draw energy from the energy store.

The aim mentioned at the beginning is also achieved with a bending press with a tool holder and a bending tool according to the invention.

A preferred embodiment is characterized in that the tool holder for supplying energy to the bending tool has an electrical or electromagnetic interface, the tool holder preferably being in the form of a rail and the interface in the form of at least one contact strip running along and / or in the rail is. As a result, the bending tool used in the tool holder can also be supplied with electrical energy during the bending process. In the case of a contact strip, such a supply can take place independently of the position of the bending tool in the rail.

Finally, the invention also includes the use of a bending tool according to one of the aforementioned embodiments in a method according to the invention for adjusting a shaped section of a bending tool.

For a better understanding of the invention, it is explained in more detail with reference to the following figures.

Fig. 1

eine Biegepresse mit einem erfindungsgemäßen Biegewerkzeug, dessen Formabschnitt eine erste Stellung einnimmt;

Fig. 2

die Biegepresse aus Fig. 2, wobei der Formabschnitt des Biegewerkzeuges eine zweite Stellung einnimmt;

Fig. 3

eine Sperreinrichtung mit Druckmittelkanal und Rückstelleinrichtung;

Fig. 4

eie Ausführungsform eines erfindungsgemäßen Biegewerkzeuges;

Fig. 5

eine Ausführungsform eines erfindungsgemäßen Biegewerkzeuges in schematischer Darstellung;

Fig. 6

eine Ausführungsform einer (Unter-)Werkzeughalterung mit Kontaktleisten;

Fig. 7

eine Variante der Ventilbetätigung;

Fig. 8

eine Ausführungsform einer Biegepresse mit Pressantrieb und Verfahrantrieb;

Fig. 9

ein Biegewerkzeug mit integriertem Verfahrantrieb;

Fig. 10

eine Biegewerkzeug mit integriertem Antrieb zum Betätigen einer Arretiereinrichtung;

Fig. 11

eine weitere Ausführungsform eines Biegewerkzeuges;

Fig. 12

eine Ausführungsform mit integriertem Verstell-Antrieb zum Verstellen des Formabschnittes;

Fig. 13

ein Biegewerkzeug mit verschwenkbarem Formteil.

They each show in a greatly simplified, schematic representation:

Fig. 1

a bending press with a bending tool according to the invention, the mold section of which assumes a first position;

Fig. 2

the press brake Fig. 2 wherein the forming section of the bending tool occupies a second position;

Fig. 3

a locking device with pressure medium channel and reset device;

Fig. 4

eie embodiment of a bending tool according to the invention;

Fig. 5

an embodiment of a bending tool according to the invention in a schematic representation;

Fig. 6

an embodiment of a (sub) tool holder with contact strips;

Fig. 7

a variant of valve actuation;

Fig. 8

an embodiment of a bending press with press drive and traversing drive;

Fig. 9

a bending tool with integrated travel drive;

Fig. 10

a bending tool with an integrated drive for actuating a locking device;

Fig. 11

another embodiment of a bending tool;

Fig. 12

an embodiment with an integrated adjustment drive for adjusting the mold section;

Fig. 13

a bending tool with a pivotable molded part.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference symbols or the same component designations, it being possible for the disclosures contained in the entire description to be transferred accordingly to the same parts with the same reference symbols or the same component designations. The position details selected in the description, such as above, below, to the side, etc., also relate to the figure immediately described and shown and these position details are to be transferred accordingly to the new position in the event of a change in position.

The exemplary embodiments show possible design variants of an adjustment method, a bending tool or a bending press, whereby it should be noted at this point that the invention is not limited to the specific design variants shown, but rather various combinations of the individual design variants with one another are possible and these The possibility of variation due to the teaching on technical action through the present invention lies within the ability of the person skilled in the art working in this technical field.

Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions.

The task on which the independent inventive solutions are based can be found in the description.

Above all, the embodiments shown can form the subject of independent solutions according to the invention. The related tasks and solutions according to the invention can be found in the detailed descriptions of these figures.

For the sake of clarity, it should finally be pointed out that for a better understanding of the structure of a bending tool or a bending press, these or their components have been shown partially not to scale and / or enlarged and / or reduced.

Figs. 1 and 2 show a bending press 10 with a lower tool holder 11 and an upper tool holder 12 and a press drive 13 for moving the tool holders 11, 12 with the bending tools 1, 14 inserted into each other. A sheet-shaped workpiece is already positioned between the tools 1, 14.

The bending tool 1 has a holding section 5 for inserting the bending tool 1 into the tool holder 11 of the bending press 10 and a shaping section 2 for shaping the workpiece 15. The mold section 2 comprises two mold parts 3, 4 which can be moved linearly relative to the holding section 5 and which form the die jaws of a die. The holding section 5 is formed on the underside of a block 6, the molded parts 3, 4 being movably supported in or on the block 6 (here: linearly guided). A comparison between the Figs. 1 and 2 shows that the die width of the die can be adjusted by adjusting the molded parts 3, 4. The degrees of freedom of movement of the two molded parts 3, 4 are V-shaped.

The bending tool 1 comprises a spacer 21, preferably in the form of a web, through which the die jaws are spaced apart or guided. The molded parts 3, 4 can be moved between two stop positions, one stop position corresponding to a fully extended position of the molded parts 3, 4 and the other stop position corresponding to a fully retracted position of the molded parts 3, 4. The stop pin defining the stop positions is in the Figs. 1 and 2 (without reference numerals) shown.

In the embodiment shown, the mold section 2 can be adjusted by applying pressure to the bending tool 1 in a direction running from the workpiece-side region of the mold section 2 to the holding section 5. A pressing direction is defined by the mold section 2 of the bending tool 1 (direction perpendicular to the plane in which the die opening lies). The extension (height) of the bending tool 1 in the pressing direction is greater in a first position of the mold section 2 ( Fig. 1 ) than in a second position of the mold section 2 ( Fig. 2 ).

A method for adjusting the mold section 2 of the bending tool 1 in a bending press 10, which has a press drive (13), is described in more detail below. As from the Figs. 1 and 2 it can be seen here that the mold section 2 of the bending tool 1 is adjusted by the press drive 13, which moves the tool holders 11, 12 towards one another along the pressing direction 25.

In another, in Fig. 8 In the embodiment shown, the adjustment of the mold section 2 can also take place by means of a traversing drive 26 of the bending press 10. The displacement drive 26 causes a relative movement in the bending press 10 between the bending tool 1 with the mold section 2 to be adjusted and an opposing bending tool 14 in a direction transverse to the pressing direction 25.

The adjustment of the mold section 2 can take place in that the press drive 13 and / or the displacement drive 26 move opposing tool holders 11, 12 of the bending press 10, preferably an upper tool holder and a lower tool holder, relative to one another, in particular towards one another. In this case, the bending tool 1 with the shaped section 2 to be adjusted is held by one of the tool holders 11 and pressurized via the opposite tool holder 12. The opposite tool holder 12 or a bending tool 14 inserted in the opposite tool holder 12 ( Fig. 8 ) or a workpiece 15 ( Figs. 1 and 2 ) rest against the mold section 2 to be adjusted.

The adjustment of the shaped section 2 of the bending tool 1 can be carried out on a workpiece 15 during a bending process. During the adjustment of the mold section 2, the workpiece 15 is arranged in the bending press 10, preferably clamped between the bending tools 1, 14.

The adjustment of the mold section 2 can include a displacement and / or a pivoting of the at least one mold part 3, 4 and / or an inclination of the at least one mold part 3, 4 relative to the pressing direction 25.

The molded parts 3, 4 each interact with transmission parts 23, 24, which have a piston surface on the side facing away from the respective molded part 3, 4 and are displaceable in a cylinder. The cylinders merge into a common pressure medium channel 17.

the end Fig. 3 it can be seen that the bending tool 1 comprises a (here: hydraulic) locking device 7 which interacts with the mold section 2 and which, in the locked state, secures the mold section 2 against displacement. In the embodiment shown, the locking device 7 is arranged in the interior of the bending tool 1.

The locking device 7 comprises a drive 8, in particular an actuator, a motor, a cylinder or the like, by means of which the locking device 7 can be transferred into the locked state and / or into the released state.

When adjusting the mold section 2, the locking device 7 is first released. Then, by the press drive 13, opposing tool holders 11, 12 of the bending press 10 are moved towards one another. The bending tool 1 with the mold section 2 to be adjusted is subjected to pressure. After the desired position of the mold section 2 has been reached, the locking device 7 is transferred to the locked state.

How out Fig. 3 The locking device 7 can be seen to include a pressure medium channel 17 which is divided into a first pressure medium area 18 and a second pressure medium area 19 by an actuatable valve 16, preferably by a releasable check valve. The first pressure medium area 18 is coupled to the molded parts 3, 4 via the transmission parts 23, 24. In the embodiment shown, the two molded parts 3, 4 thus interact with the same locking device 7.

The locking device 7 is coupled via the second pressure medium area 19 to a restoring device 20 which brings about a restoring of the molded parts 3, 4. The reset device 20 comprises a return spring and is designed as an energy store, which can be acted upon by an adjustment movement of the at least one molded part 3, 4.

When the valve 16 is closed, the molded parts 3, 4 cannot be adjusted due to the incompressible pressure medium. When the valve 16 is open, the molded parts can be pressed downwards (e.g. by the press drive 13). The pressure medium flows into the cylinder of the restoring device 20 and acts on the spring there. As soon as the valve 16 is closed again, the molded parts remain locked.

Fig. 7 shows an embodiment of a locking mechanism 7 in which the drive is designed in the form of a (rotary) motor. The rotary movement is converted into a linear movement of an actuating pin which opens the check valve 16. In this embodiment, the drive 8 only has to bring the locking mechanism 7 into the released state. The blocking device 7 enters the blocked state by itself, namely through the check valve 16.

Fig. 4 and 5 show exemplary embodiments in which the locking device 7 is housed in the interior of the bending tool 1 or of the block 6. The pressure medium channel 17 can be formed by at least one bore. In Fig. 4 an actuating element 26 protruding from the side wall of the bending tool 1 can be seen, with which the valve position can be adjusted from outside (here by turning). Here the valve 16 is formed integrally with the actuating element 26. The execution according to Fig. 5 shows a drive 8 arranged in the interior of the bending tool 1 or the block 6, which drive is designed here as a valve drive. An electrical interface 9, which is connected to the drive 8, can also be seen. The interface 9 is arranged on the holding section 5 of the bending tool 1. Fig. 6 shows a corresponding tool holder 11, which has an electrical interface 22 for supplying energy to the bending tool 1. The tool holder 11, 12 has the shape of a rail. The interface 22 is designed in the form of at least one contact strip running along or in the rail. Instead of electrical interfaces 9, 22, electromagnetic (ie inductive) interfaces could also be used.

In the following, those aspects that relate to an integrated drive are described in more detail. In the embodiments of Figures 3 , 5 and 7 to 12, the bending tool 1 has at least one drive 8, 28, 34, 38. This is preferably arranged in the interior of the bending tool 1. The possibility of linking the locking device 7 with an integrated drive, that is to say with its own drive for the bending tool, has already been described in detail.

Another possibility is to integrate an adjustment drive 28 in the bending tool 1 for adjusting the mold section 2. Such a drive 28 interacts with at least one shaped part 3, 4 of the shaped section 2 that is movable relative to a holding section 5 of the bending tool 1. Corresponding examples are in the Figures 12 and 13th shown. Here the drive is designed as a drive 28 of a pump 27 (with two conveying directions). The pump 27 conveys the pressure medium and thus presses (or “pulls”) the transmission parts 23, 24, whereby an adjustment of at least one molded part 3 is effected. In Fig. 12 one pump connection is connected to the valve 16 and the other pump connection is connected to a pressure medium reservoir 29. Incidentally shows Fig. 13 also the possibility of an application to a punch-like bending tool 1. At this point it should be pointed out that the bending tools of the Fig. 12 and 13th insofar as they relate to the adjustment drive 28, are not the subject of the present invention, because the adjustment of the mold section 2 takes place by means of the press drive 13 and / or a travel drive 26 of the bending press 10.

The embodiment according to Fig. 9 shows a bending tool 1 with a travel drive 38 for moving the bending tool 1 in a tool holder 11 or in a tool holder 11. The bending tool 1 comprises at least one drive part 37 movable by the drive 38, in particular a wheel, a chain, a caterpillar or a circumferential belt. In order to interact with the tool holder 11, at least a section of the drive part 37 is located on an outside of the bending tool 1.

The embodiment according to Fig. 10 shows a bending tool with a locking device 35 for locking the bending tool 1 on or in a tool holder 11. An integrated drive 34 of the bending tool 1 interacts with the locking device 35 (here via a pressure medium line 36). The locking device 35 can be transferred into the locked state and / or into the released state by the drive 34.

The drive 8, 28, 34, 38 can be, for example, an electromagnetic drive, in particular a motor or an electromagnet, or a hydraulic drive, in particular a cylinder-piston unit or a pump drive.

Fig. 11 shows preferred aspects which - individually or together - can be used in all of the embodiments described so far. The bending tool 1 can have an electrical, preferably rechargeable, energy store 32 which is connected to the drive 8, 28, 34, 38. The bending tool 1 can have a control device 30 by which the drive 8, 28, 34, 38 can be controlled. A preferably wireless control interface 31, which is connected to the control device 30, can be provided in order to transmit external control commands. An electrical (or inductive) interface 9, which is connected to the drive 8 and to the electrical energy store 32, can also be seen. Such a bending tool 1 can be equipped with a tool holder 11 according to FIG Fig. 6 or Fig. 8 be used to supply the drive, in particular to energize it.

• das Sperren und/oder Lösen eines verstellbaren Formabschnittes 2 des Biegewerkzeuges 1, und/oder
• das Verstellen eines Formabschnittes 2 eines Biegewerkzeuges 1, und/oder
• das Verfahren eines Biegewerkzeuges 1 in eine Werkzeughalterung 11 und/oder innerhalb einer Werkzeughalterung 11, und/oder
• das Arretieren des Biegewerkzeuges 1 an oder in einer Werkzeughalterung 11

umfassen. Bezugszeichenaufstellung 1 Biegewerkzeug 31 Steuerschnittstelle 2 Formabschnitt 32 Energiespeicher 3 Formteil 33 Pumpe 4 Formteil 34 Antrieb 5 Halteabschnitt 35 Verriegelungselement 6 Block 36 Druckmittelleitung 7 Sperreinrichtung 37 Antriebsteil 8 Antrieb 38 Antrieb 9 Schnittstelle 10 Biegepresse 11 (Unter-)Werkzeughalterung 12 (Ober-)Werkzeughalterung 13 Pressantrieb 14 Biegewerkzeug 15 Werkstück 16 Ventil 17 Druckmittelkanal 18 Erster Druckmittelbereich 19 Zweiter Druckmittelbereich 20 Rückstelleinrichtung 21 Abstandhalter 22 Schnittstelle 23 Übertragungsteil 24 Übertragungsteil 25 Pressrichtung 26 Betätigungselement 27 Pumpe 28 Verfahr-Antrieb 29 Druckmittelreservoir 30 Steuereinrichtung In summary, the manipulation of the bending tool by the drive 8, 28, 34, 38

• locking and / or releasing an adjustable shaped section 2 of the bending tool 1, and / or
• the adjustment of a mold section 2 of a bending tool 1, and / or
• the movement of a bending tool 1 into a tool holder 11 and / or within a tool holder 11, and / or
• the locking of the bending tool 1 on or in a tool holder 11

include. <b> List of reference symbols </b> 1 Bending tool 31 Control interface 2 Mold section 32 Energy storage 3 Molded part 33 pump 4th Molded part 34 drive 5 Holding section 35 Locking element 6th block 36 Pressure medium line 7th Locking device 37 Drive part 8th drive 38 drive 9 interface 10 Bending press 11 (Sub) tool holder 12th (Upper) tool holder 13th Press drive 14th Bending tool 15th workpiece 16 Valve 17th Pressure medium channel 18th First pressure medium area 19th Second pressure medium area 20th Reset device 21 Spacers 22nd interface 23 Transmission part 24 Transmission part 25th Pressing direction 26th Actuator 27 pump 28 Travel drive 29 Pressure fluid reservoir 30th Control device

Claims (25)

1. A method for adjusting a forming section (2) of a bending tool (1) in a bending press (10), which has a press drive (13), wherein the bending tool (1) has a holding section (5) for inserting the bending tool (1) in a tool mount (11, 12) of a bending press (10), and wherein the forming section (2) of the bending tool (1) comprises at least one forming part (3, 4) movable relative to the holding section (5), and characterized in that the adjustment of the forming section (2) of the bending tool (1) is carried out by means of the press drive (13), and that the bending tool (1) comprises a preferably hydraulic locking device (7) cooperating with the forming section (2), which locking device (7) - in the locked state - secures the forming section (2) against adjustment.
2. The method according to claim 1, characterized in that the adjustment of the forming section (2) is carried out in that opposite tool mounts (11, 12) of the bending press (10), preferably an upper tool mount and a lower tool mount, are moved relative to one another, in particular towards one another, by the press drive (13) and preferably by an additional displacement drive (26), wherein the bending tool (1) along with the forming section (2) to be adjusted is held by one of the tool mounts (11) and is applied with pressure by means of the opposite tool mount (12), wherein preferably the opposite tool mount (12) or a bending tool (14) inserted in the opposite tool mount (12) or a workpiece (15) abuts against the forming section (2) to be adjusted.
3. The method according to claim 1 or 2, characterized in that the adjustment of the forming section (2) of the bending tool (1) is carried out during a bending operation on a workpiece (15), wherein the workpiece (15) - during the adjustment of the forming section (2) - is arranged in the bending press (10), preferably clamped between the bending tool (1) with the forming section (2) to be adjusted and an opposite bending tool (14).
4. The method according to one of the preceding claims, characterized in that the forming section (2) of the bending tool (1) forms a mold, and the adjustment of the forming section (2) comprises adjusting the die width of the mold.
5. The method according to one of the preceding claims, characterized in that during the adjustment of the forming section (2) by means of the press drive (13), at least one forming part (3, 4) is moved relative to the holding section (5), preferably in a linear manner.
6. The method according to claim 5, characterized in that the adjustment of the forming section (2) comprises a displacement of the at least one forming part (3, 4) and/or a pivoting of the at least one forming part (3, 4) and/or a tilting of the at least one forming part (3, 4) relative to the pressing direction (25).
7. The method according to one of the preceding claims, characterized in that the locking device (7) is released, that opposite tool mounts (11, 12) of the bending press (10) are moved towards one another by means of the press drive (13), wherein the bending tool (1) with the forming section (2) to be adjusted is applied with pressure, and that the locking device (7) is transferred into the locked state after reaching the desired position of the forming section (2).
8. A bending tool (1) for a bending press (10), wherein the bending tool (1) has a holding section (5) for inserting the bending tool (1) into a tool mount (11, 12) of a bending press (10) and a forming section (2) for forming a workpiece (15), wherein the workpiece-sided region of the forming section (2) and the holding section (5) are formed on opposite sides of the bending tool (1), and wherein the forming section (2) comprises at least one forming part (3, 4) movable relative to the holding section (5), characterized in that the forming section (2) is adjustable, by pressurization of the bending tool (1), in a direction extending from the workpiece-sided region of the forming section (2) to the holding section (5), wherein the extension of the bending tool (1) is changeable in a direction extending from the workpiece-sided region of the forming section (2) to the holding section (5), wherein such a change of the height of the bending tool (1) involves an adjustment of the forming section (2), and that the bending tool (1) comprises a preferably hydraulic locking device (7) cooperating with the forming section (2), which locking device (7) - in the locked state - secures the forming section (2) against adjustment.
9. The bending tool according to claim 8, characterized in that a pressing direction is defined by the forming section (2) of the bending tool (1), and that the extension of the bending tool (1) in the pressing direction is greater in a first position of the forming section (2) than in a second position of the forming section (2).
10. The bending tool according to claim 8 or 9, characterized in that the locking device (7) is arranged inside the bending tool (1).
11. The bending tool according to one of claims 8 to 10, characterized in that the locking device (7) has a drive (8), in particular an actuator, a motor, a cylinder, or the like, by means of which the locking device (7) can be transferred into the locked state and/or into the released state.
12. The bending tool according to claim 11, characterized in that the bending tool (1) has an electrical and/or electromagnetic interface (9), which is connected to the drive (8) of the locking device (7), wherein preferably the interface (9) is arranged on the holding section (5) of the bending tool (1).
13. The bending tool according to one of claims 8 to 12, characterized in that the locking device (7) has a pressure medium channel (17), which is divided into a first pressure medium region (18) and a second pressure medium region (19) by means of an actuatable valve (16), preferably by means of a releasable back pressure valve, wherein the first pressure medium region (18) is coupled to the at least one forming part (2).
14. The bending tool according to one of claims 8 to 13, characterized in that the forming section (2) has at least two movable forming parts (3, 4), which cooperate with the same locking device (7), in particular are coupled to one another by a common pressure medium channel (17).
15. The bending tool according to one of claims 8 to 14, characterized in that the bending tool (1) has a reset device (20), in particular a return spring, for resetting the at least one forming part (3, 4).
16. The bending tool according to claim 15, characterized in that the reset device (20) comprises an energy storage, in particular a spring, which can be subjected to an adjustment movement of the at least one forming part (3, 4).
17. The bending tool according to claim 15 or 16, characterized in that the reset device (20) cooperates with the locking device (7), preferably is coupled to the second pressure medium region (19) of the pressure medium channel (17).
18. The bending tool according to one of claims 8 to 17, characterized in that the holding section (5) is formed on a block (6), wherein the at least one forming part (3, 4) is mounted in or on the block (6) so as to be movable, preferably guided in a linear manner.
19. The bending tool according to one of claims 8 to 18, characterized in that the forming section (2) of the bending tool (1) forms a mold, the die width of which is adjustable.
20. The bending tool according to claim 19, characterized in that the forming section (2) of the bending tool (1) comprises two forming parts (3, 4) movable in a linear manner, which form the die jaws of the mold, wherein the directions of movement of the two forming parts (3, 4) run V-shaped.
21. The bending tool according to claim 20, characterized in that the bending tool (1) has a spacer (21), preferably in the form of a bridge, by means of which the die jaws are spaced apart from one another.
22. The bending tool according to one of claims 8 to 21, characterized in that the at least one forming part (3, 4) is movable between two stop positions, wherein the one stop position corresponds with a fully extended position of the forming part (3, 4) and the other stop position corresponds with a fully retracted position of the forming part (3, 4).
23. A bending press (10) with at least one tool mount (11, 12) and a bending tool (1), characterized in that the bending tool (1) is formed according to one of claims 8 to 22.
24. The bending press according to claim 23, characterized in that the tool mount (11, 12) has an electrical or electromagnetic interface (22) for supplying the bending tool (1) with energy, wherein preferably the tool mount (11, 12) is designed in the form of a rail and the interface (22) in the form of at least one contact bar extending along and/or in the rail.
25. A use of a bending tool (1) according to one of claims 8 to 22 in a method according to one of claims 1 to 7.

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