WO2016187635A1

WO2016187635A1 - Method for adjusting a forming portion of a bending tool

Info

Publication number: WO2016187635A1
Application number: PCT/AT2016/050160
Authority: WO
Inventors: Christian Gasser; Burkhard Heller; Harald KNEIDINGER; Heinz Leumüller
Original assignee: Trumpf Maschinen Austria Gmbh & Co. Kg.
Priority date: 2015-05-28
Filing date: 2016-05-25
Publication date: 2016-12-01
Also published as: AT517315B1; EP3302842A1; AT517315A1; EP3302842B1

Abstract

The invention relates to a method for adjusting a forming portion (2) of a bending tool (1) in a bending press (10) which has a press drive (13). In order to be able to adjust the forming portion in a simple manner within the bending press, the adjustment of the forming portion (2) of the bending tool (1) is effected by the press drive (13) and/or by a displacement drive (26) which brings about a relative movement, in the bending press (10), between the bending tool (1) having the forming portion (2) to be adjusted and a bending tool (14) located opposite the latter, in a direction transversely to the pressing direction (25). The invention also relates to a bending press and to the use of a bending tool in a method for adjusting a forming portion of a bending tool.

Description

Method for adjusting a molding section of a bending tool

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 molding section of a bending tool.

DE3235775A1 discloses a lower tool for a press brake for folding sheet metal. On a lower part of a tool holder is arranged, in which a bending tool is used. The tool holder is designed as a tool holder split in the longitudinal direction of the handlebar. Both tool holder halves are adjustable transversely to the longitudinal direction Holml. In each tool holder half a replaceable Abkantwange can be used. The adjustment is made via an adjusting spindle.

EP0444169B1 discloses a tool for bending presses with a die having two half-dies arranged on both sides of the bending plane. By a displacement of the half-matrices perpendicular to the pressing direction, the matrix shape can be broadened or narrowed.

WO0176784A1 discloses a tool with two mutually displaceable jaws for adjusting the die size. The shift takes place as in the two preceding documents in a direction perpendicular to the pressing direction. The disadvantage of such constructions is that the change in the die width of a bending tool requires a separate operating mechanism that must be operated manually by an operator. Especially in a bending press the space for such manipulations is very narrow and visibility is severely limited, which has a complicated for the operator operation and often inaccurate setting result.

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

This object is achieved with a method mentioned above in that the adjustment of the molding section of the bending tool is carried out by the press drive and / or by a (integrated in the bending press) traversing drive in the bending press a relative movement between the bending tool with the mold section to be adjusted and an opposite bending tool in particular in a direction transverse to the pressing direction (the bending press) causes takes place.

The adjustment of the mold section by the press drive and / or a travel drive integrated in the press brake is based on the idea of effecting the adjusting movement on the mold section by a relative movement of two opposing tools or tool holders. The press drive and / or the travel drive thus simultaneously act as Versteilantrieb for the mold section. Therefore, no separate drive is required for the adjustment. The adjustment can be done automatically. A major advantage is that the adjustment can be done during the bending process on a workpiece. As a result, complex bending operations on a workpiece can be realized without having to change tools.

The press drive is that drive that causes opposing tools to move toward each other and to bend a workpiece between them. The direction of the juxtaposition of opposing tools corresponds to the pressing direction of the bending press. In addition to the press drive, the bending press can also have a travel drive to position the tools transversely to the pressing direction. Also, this travel drive can be used to adjust the mold section of a (used in the tool holder) bending tool. According to the relative direction of travel caused by the travel drive, a bending tool can (mechanically) act on the mold section of another bending tool and thereby move a movable shaped part.

The bending tool and the bending press are designed in particular for bending flat workpieces, in particular sheets. A preferred embodiment is characterized in that the adjustment of the mold section takes place in that 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 / or by the drive drive. wherein the bending tool is held with the mold section to be adjusted by one of the tool holders and is applied via the opposite tool holder with pressure. In this case, the opposing tool holder or a bending tool or a workpiece inserted in the opposite tool holder preferably rests against the mold section to be adjusted. The bending tool to be adjusted is used here in the tool holder, ie it is already in the position required for the bending operation. The mold 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) by the relative movement of the opposite tool holder.

A preferred embodiment is characterized in that the adjustment of the mold section of the bending tool is performed during a bending operation on a workpiece, wherein the workpiece during the adjustment of the mold section is arranged in the bending press, preferably between the bending tool with the mold section to be adjusted and an opposite bending tool is clamped. As mentioned earlier, this allows complex bending operations to be performed without the need to use (and change constantly) 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 comprises an adjustment of the die width of the die. The shaping of a workpiece, in particular at the bending edge, can thereby be selectively influenced and varied. Preferably, the die forming the bending tool is inserted in the lower tool holder. The upper tool holder can now adjust the die, preferably via an upper tool inserted therein. A preferred embodiment is characterized in that the bending tool has a holding portion for inserting the bending tool into a tool holder of the bending press and that the mold portion of the bending tool comprises at least one movable relative to the holding portion molding, wherein when adjusting the Formabschnit- tes by the press drive at least one Molded part is preferably moved linearly relative to the holding portion. About the holding section, the bending tool is fixed in the tool holder. However, the molded part remains - regardless of the fixation of the holding section by the tool holder - adjustable. The mold portion with the movable mold part (s) and the holding portion are preferably formed on opposite sides of the bending tool. Thus, the mold portion may be formed on the upper side of the bending tool and the holding portion on the underside 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 molded part and / or a pivoting of the at least one molded part and / or an inclination of the at least one molded part relative to the pressing direction. These variants allow a variety of possible manipulations of a mold section with correspondingly shaped parts, resulting in new and diverse ways of planning and performing bending operations. In particular, the molded part can be rotatably and / or (linear or along a curved guide track) displaceably mounted.

A preferred embodiment is characterized in that the bending tool comprises a cooperating with the mold section, preferably hydraulic locking device which secures the mold section against an adjustment in the locked state. The adjustment of the mold section can only be done with dissolved locking device. In the locked state ensures that the mold section does not change. The integration of such a locking device on or in the bending tool is a particularly preferred embodiment, because no separate measures must be taken to lock the mold section.

A preferred embodiment is characterized in that the locking device is released, that the press drive moves opposite tool holders of the bending press toward one another, wherein the bending tool can be adjusted with the bending device. the mold portion is pressurized, and that the locking device is transferred after reaching the desired position of the mold portion in the locked state. The aforementioned object is also achieved with a bending tool for a bending press, wherein the bending tool has a holding section for inserting the bending tool into a tool holder of a bending press and a forming section for forming a workpiece. In this case, the mold section comprises at least one movable relative to the holding portion molding.

This embodiment of a bending tool allows an adjustment of the mold section by means of (above-mentioned) press drive and / or travel drive. The bending tool is formed with its molding portion to be adjusted according to a method of the invention. As already mentioned, the mold section with the movable molding part (s) and the holding section may be formed on opposite sides of the bending tool, so that the adjustment process of the mold section is not impaired by the holding or fixing of the bending tool by a tool holder. The mold section represents the werkstücksei term section and the holding section the workpiece facing away portion of the bending tool.

The extent of the bending tool in a direction extending from the workpiece-side region of the mold section to the holding section is preferably variable. Such a (height) change goes hand in hand with an adjustment of the mold section. A preferred embodiment is characterized in that the mold section is adjustable by pressurizing the bending tool in a direction extending from the workpiece-side region of the mold section to the holding section. Such pressurization can - as explained above - done 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 greater in a first position of the forming section than in a second position of the bending section Shape- 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 is compressible or zusammenstauchbar. Also, a change in shape of the mold section (eg change the Gesenkweite) may be linked to this height adjustment of the bending tool. For example, in the case of a die, the pressing direction is defined by a direction perpendicular to the plane in which the die opening of the die lies. In the case of a punch, the pressing direction is dictated by the direction in which the punch points. A preferred embodiment is characterized in that the bending tool comprises a cooperating with the mold section, preferably hydraulic locking device which secures the mold section against an adjustment (in at least one adjustment) in the locked state, wherein preferably the locking device is arranged in the interior of the bending tool. The locking device ensures a reliable locking of the mold section or its / -r molding / -e in at least one, preferably two (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 Formabschnit- tes it can also be designed to save space. The integration of the locking device inside the bending tool allows the construction of compact and easy-to-handle tools.

A preferred embodiment is characterized in that the locking device comprises a drive, in particular an actuator, a motor, a cylinder or the like, by which the locking device can be transferred to the locked state and / or to the released state. The loosening and locking can therefore be done automatically, preferably by a controller. The handling of an operator in anyway very narrow (danger) area is not required 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, wherein preferably the interface to the holding portion of Bending tool is arranged. The drive is supplied with energy via the interface. A (preferably rechargeable) electrical energy store, in particular a battery or a rechargeable battery, can also be connected between the interface and the drive. During use of the tool, the drive can draw energy from the energy storage.

A preferred embodiment is characterized in that the blocking device has a pressure medium channel which is divided by an actuatable valve, preferably by an unlockable check valve, into a first pressure medium region and a second pressure medium region, wherein the first pressure medium region adjoins the at least one molded article - is coupled. The pressure medium channel is filled with an incompressible pressure medium, preferably hydraulic oil. By this measure, a continuous adjustment or locking of the mold section can be done in any position. When the valve is closed, the mold section remains locked in the first pressure medium region 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, wherein now also the shape section is adjustable. The said valve can be actuated by the above-mentioned drive.

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

The term "pressure medium channel" is understood to mean any device which can accommodate pressure medium (also under pressure) .The pressure medium channel may in particular comprise a pressure medium line, a pressure medium tube and / or a cylinder in which eg an element with a piston surface can be displaced The course of the pressure medium channel can also have any desired design, in particular straight and curved sections Instead of (or in addition to) a hydraulic locking device, a mechanical locking device could also be used An integrated drive could translate the latch to the locked (or locked) and de-stressed (or released) states, respectively. A preferred embodiment is characterized in that the mold section has at least two movable mold parts which cooperate with the same locking device, in particular are coupled together by a common pressure medium channel. The adjustment and also provision of the moldings can be done synchronously. Also, only one locking device is required.

A preferred embodiment is characterized in that the bending tool has a rear part device, in particular a return spring, for returning the at least one molded part. By this measure, the (previously adjusted) molded part can already be spent within the bending press and in eigesetztem state of the bending tool in its original position. The molded part can thus be moved in opposite directions. A preferred embodiment is characterized in that the rear part device comprises a force accumulator, in particular a spring, which can be acted upon by an adjusting movement of the at least one molded part. This particularly elegant solution requires no active drive for the return movement. A preferred embodiment is characterized in that the rear part device cooperates with the locking device, preferably coupled to the second pressure medium region of the pressure medium channel. To reset only the locking device must be operated. A preferred embodiment is characterized in that the holding portion is formed on a block, wherein the at least one molded part is movably mounted in or on the block, preferably linearly guided. The mold portion with the movable mold part (s) and the holding portion are preferably formed on opposite sides of the bending tool. Thus, the mold section can be formed on the upper side of the bending tool and the holding section on the underside of the bending tool. Between the holding section and the mold section extends a block in which, for example, a locking device (described below) can be integrated. Preferably, at least one bore is formed in the block (made of solid material). The hole (s) can / can

form at least a portion of the pressure medium channel (the blocking device), and / or form a guide for the at least one molded part or a transmission part interacting with the same,

- and / or a valve (the locking device) accommodate

and / or accommodate a drive

- and / or accommodate an energy storage

- And / or host a control device.

The enumerated components are z.T. only further explained below.

A preferred embodiment is characterized in that the mold section of the bending tool forms a die whose die width is adjustable. This results in a variety of bending options with the same tool. The die is preferably elongate and has a substantially constant cross-section along its longitudinal extent. A preferred embodiment is characterized in that the mold portion of the bending tool comprises two linearly movable mold parts which form the die jaws of the die, wherein the directions of movement of the two mold parts are V-shaped. Pressurization in the pressing direction or transversely to the plane in which the die opening is located thereby causes an enlargement of the die width. The distance between the workpiece-side end of the mold section and the holding section formed on the opposite side of the bending tool is thus variable. A compression of the bending tool is accompanied here by an increase in the Gesenkweite.

A preferred embodiment is characterized in that the bending tool has a spacer, preferably in the form of a web, through which the die jaws are spaced from each other. Such a spacer also forms a kind of guide through which the jaws are guided in a defined path. A preferred embodiment is characterized in that the at least one molded part is movable between two stop positions, wherein the one stop position of a fully extended position of the molded part and the other stop position corresponds 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, wherein the drive is preferably arranged in the interior of the bending tool. An 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 this. By integrating a drive in a bending tool, the functionalities of the bending tool can be extended. 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 a power supply interface, e.g. an electrical connection. The drive is in particular an active drive, i. can only be activated upon supply of particular electrical energy. The drive can be controlled either directly via the power supply interface or via a separate control input.

Depending on its function in the bending tool, the drive can be an actuating drive (eg in the sense of an actuator), an adjustment drive or a travel drive. The drive can be switchable or infinitely operable between (eg two) discrete (end) positions. It can be designed in particular as a motor (rotary or linear motor), solenoid, cylinder drive, pump drive, locking actuator and / or valve actuation. The bending tool can have at least two drives whose functionalities are different. Preferably, the drive is accommodated in a bore extending in the bending tool, in particular in a block of solid material. The drive can be designed to save space, in particular as a miniature drive. A preferred embodiment is characterized in that a drive of the bending tool is a travel drive for moving the bending tool in a tool holder or in a tool holder. By this measure, the bending tool is self-propelled. An external moving device is therefore no longer absolutely necessary. This measure allows an automatic and accurate positioning of the bending tool by a tool drive.

A preferred embodiment is characterized in that the bending tool at least one movable by the drive drive part, in particular a wheel, a chain, a bead or a circulating belt having, wherein preferably at least a portion of the drive member is located on an outer side of the bending tool. The moving drive member acts on a stationary (driving) surface, e.g. the tool holder, together, whereby a movement of the bending tool is effected. 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 cooperates with the locking device, wherein the locking device by the drive in the locked state and / or in the dissolved state is transferable. In this embodiment, the locking of the bending tool to the tool holder is automated. The drive encompassed by the bending tool ensures reliable operation 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 storage (eg battery or rechargeable battery), which is connected to the drive. The energy store is preferably arranged in the interior of the bending tool and enables activation of the drive even in situations in which there is no external power supply. This may for example be the case when the bending tool is inserted in the tool holder of a bending press. If the tool has been returned to the tool magazine after a bending process, the energy storage device can be recharged there for the next use. A preferred embodiment is characterized in that the bending tool comprises a control device, by means of 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 reliably and in particular also controlled 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 with an electrical energy store, wherein preferably the interface is arranged on the holding portion of the bending tool. The drive is supplied with energy via the interface. A (preferably rechargeable) electrical energy store, in particular a battery or a rechargeable battery, can also be connected between the interface and the drive. During use of the tool, the drive can draw energy from the energy storage.

The aforementioned object 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, wherein preferably the tool holder is designed in the form of a rail and run the interface in the form of at least one along and / or in the rail Contact strip is formed. 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 molding section of a bending tool.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

In each case, in a highly simplified, schematic representation:

Figure 1 is a bending press with a bending tool according to the invention, the mold section occupies a first position.

FIG. 2 shows the bending press from FIG. 2, the shaping section of the bending tool assuming a second position; FIG.

3 shows a locking device with pressure medium channel and rear part device;

4 shows an embodiment of a bending tool according to the invention;

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

6 shows an embodiment of a (sub) tool holder with contact strips; Fig. 7 shows a variant of the valve actuation;

8 shows an embodiment of a bending press with press drive and travel drive; 9 shows a bending tool with integrated positioning drive;

10 shows a bending tool with integrated drive for actuating a locking device; 11 shows a further embodiment of a bending tool;

12 shows an embodiment with integrated adjusting drive for adjusting the mold section;

Fig. 13 is a bending tool with pivotable molding.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.

The embodiments show possible embodiments of an adjustment method, a bending tool or a bending press, it being noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but also various combinations of the individual embodiments are possible with each other and this Variability due to the teaching of technical action by objective invention in the skill of those working in this technical field is the expert.

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 underlying the independent inventive solutions can be taken from the description. Above all, the individual figures shown embodiments may form the subject of independent solutions according to the invention. The relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures. For the sake of the order, it should finally be pointed out that in order to better understand the construction of a bending tool or a bending press, these or their components have been shown partially unevenly and / or enlarged and / or reduced in size.

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 together the tool holders 11, 12 with the bending tools 1, 14 inserted therein. Between the tools 1, 14 is already a sheet-shaped workpiece positioned.

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 mold section 2 for forming the

Workpiece 15 on. The mold section 2 comprises two mold parts 3, 4 which are linearly movable relative to the holding section 5 and form the die jaws of a die. The holding portion 5 is formed on the underside of a block 6, wherein the mold parts 3, 4 are movably mounted in or on the block 6 (here: linearly guided). A comparison between Figs. 1 and 2 shows that the die width of the die is adjustable by an adjustment of the mold parts 3, 4. The degrees of freedom of movement of the two mold 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 mold parts 3, 4 are movable between two stop positions, wherein the one stop position of a fully extended position of the mold parts 3, 4 and the other stop position corresponds to a fully retracted position of the mold parts 3, 4. The stop pin defining the stop positions is shown in FIGS. 1 and 2 (without reference number). In the illustrated embodiment, the mold section 2 is adjustable by pressurizing the bending tool 1 in a direction extending from the workpiece-side region of the mold section 2 to the holding section 5. By the forming section 2 of the bending tool 1, a pressing direction is defined (direction perpendicular to the plane in which the Gesen- köffnung is). The extent (height) of the bending tool 1 in the pressing direction is greater in a first position of the forming section 2 (FIG. 1) than in a second position of the forming section 2 (FIG. 2). In the following, a method for adjusting the mold section 2 of the bending tool 1 in a bending press 10, which has a press drive (13), described in more detail. As can be seen from FIGS. 1 and 2, the adjustment of the mold section 2 of the bending tool 1 is effected here by the press drive 13, which moves the tool holders 11, 12 towards one another along the pressing direction 25.

In another embodiment, shown in FIG. 8, the adjustment of the mold section 2 can also be effected by a travel drive 26 of the bending press 10. In the bending press 10, the travel drive 26 effects a relative movement between the bending tool 1 with the mold section 2 to be adjusted and an opposite bending tool 14 in a direction transverse to the pressing direction 25.

The adjustment of the mold section 2 can be effected in that by the press drive 13 and / or by the drive 26 opposing tool holders 11, 12 of the bending press 10, preferably an upper tool holder and a Unterwerk- zeughalterung, relative to each other, in particular towards each other. In this case, the bending tool 1 is held with the mold section 2 to be adjusted by one of the tool holders 11 and pressurized via the opposite tool holder 12 with pressure. In this case, the opposing tool holder 12 or a bending tool 14 (FIG. 8) inserted in the opposite tool holder 12 or a workpiece 15 (FIGS. 1 and 2) can abut against the mold section 2 to be adjusted.

The adjustment of the mold section 2 of the bending tool 1 can be performed during a bending operation on a workpiece 15. The workpiece 15 is arranged during the adjustment of the mold section 2 in the bending press 10, preferably clamped between the bending tools 1, 14. The adjustment of the mold section 2 may include a displacement and / or a pivoting of the at least one molded part 3, 4 and / or an inclination of the at least one molded part 3, 4 relative to the pressing direction 25. The molded parts 3, 4 each cooperate 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.

From FIG. 3 it can be seen that the bending tool 1 comprises a locking device 7 which cooperates with the mold section 2 (here: hydraulic) and which in the locked state comprises the locking device 7

Form section 2 against an adjustment secures. In the illustrated embodiment, 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 13 opposing tool holders 11, 12 of the bending press 10 are moved towards each other by the press drive. In this case, the bending tool 1 is subjected to the mold section to be adjusted 2 with pressure. After reaching the desired position of the mold section 2, the locking device 7 is transferred to the locked state. As shown in FIG. 3, the blocking device 7 comprises a pressure medium channel 17 which is divided by an actuatable valve 16, preferably by a pilot-operated check valve, into a first pressure medium region 18 and a second pressure medium region 19. The first pressure medium region 18 is coupled to the molded parts 3, 4 via the transmission parts 23, 24. The two mold parts 3, 4 thus interact with the same locking device 7 in the illustrated embodiment.

The blocking device 7 is coupled via the second pressure medium region 19 with a return device 20, which brings about a return of the molded parts 3, 4. The rear part device 20 comprises a return spring and is designed as a force accumulator, which can be acted upon by an adjusting movement of the at least one molded part 3, 4.

When the valve 16 is closed, the mold parts 3, 4 can not be adjusted due to the incompressible pressure medium. With the valve 16 open, the mold parts can be pushed down (e.g., by the press drive 13). In this case, the pressure medium flows into the cylinder of the rear part device 20 and acts there on the spring. Once the valve 16 is closed again, the mold parts remain locked. Fig. 7 shows an embodiment of a locking mechanism 7, wherein the drive in the form of a (rotary) motor is formed. The rotational movement is converted into a linear movement of an actuating pin which opens the check valve 16. In this embodiment, the drive 8 must bring the locking mechanism 7 only in the released state. In the locked state, the locking device 7 passes by itself, namely by the check valve sixteenth

4 and 5 show embodiments in which the locking device 7 are housed in the interior of the bending tool 1 and the block 6. The pressure medium channel 17 may be formed by at least one bore. In Fig. 4 is a protruding from the side wall of the bending tool 1 actuating element 26 can be seen, with which the valve position is adjustable from outside (here by a rotation). Here, the valve 16 is integrally formed with the actuator 26. The embodiment according to FIG. 5 shows a drive 8 which is arranged in the interior of the bending tool 1 or the block 6 and which is designed here as a valve drive. Also visible is an electrical interface 9, which is connected to the drive 8. 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 extending along or in the rail. Instead of electrical

Interfaces 9, 22 could also be used electromagnetic (ie inductive) interfaces. In the following, those aspects which relate to an integrated drive are described in more detail. In the embodiments of FIGS. 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, ie bending tool-specific drive has already been described in detail.

Another possibility is to integrate an adjusting drive 28 for adjusting the mold section 2 in the bending tool 1. Such a drive 28 cooperates with at least one movable relative to a holding portion 5 of the bending tool 1 molded part 3, 4 of the mold section 2. Corresponding examples are shown in FIGS. 12 and 13. Here, the drive is designed as a drive 28 of a pump 27 (with two delivery directions). The pump 27 conveys the pressure medium and pushes (or 'pulls') so that the transmission parts 23, 24, whereby an adjustment of at least one molded part 3 is effected. In FIG. 12, one pump connection to the valve 16 and the other pump connection to a pressure medium reservoir 29 are connected. Incidentally, FIG. 13 also shows the possibility of application to a stamp-type bending tool 1. It should be pointed out here that the bending tools of FIGS. 12 and 13, insofar as they relate to the adjusting drive 28, are not the subject of the present invention. because the adjustment of the mold section 2 by means of the press drive 13 and / or a positioning drive 26 of the bending press 10 takes place.

The embodiment according to FIG. 9 shows a bending tool 1 with a traveling 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 that can be moved by the drive 38, in particular a wheel, a chain, a caterpillar or a circulating band. In order to cooperate with the tool holder 11, at least a portion of the drive part 37 is located on an outer side of the bending tool 1.

The embodiment of 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 cooperates with the locking device 35 (here via a pressure medium line 36). The locking device 35 can be transferred by the drive 34 in the locked state and / or in the released state. The drive 8, 28, 34, 38 may 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 embodiments described so far. The bending tool 1 may have an electrical, preferably rechargeable energy storage 32, which is connected to the drive 8, 28, 34, 38. The bending tool 1 may have a control device 30, by means of which the drive 8, 28, 34, 38 can be actuated. A preferably wireless control interface 31 connected to the controller 30 may be provided to communicate external control commands. Also visible is an electrical (or inductive) interface 9, which is connected to the drive 8 and to the electrical energy store 32. Such a bending tool 1 can be used with a tool holder 11 according to FIG. 6 or FIG. 8 in order to supply the drive, in particular to energize it.

In summary, the manipulation of the bending tool by the drive 8, 28, 34, 38 - the locking and / or releasing an adjustable mold section 2 of the bending tool 1, and / or adjusting a mold section 2 of a bending tool 1, and / or - the method of Bending tool 1 in 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. Reference drawing Bending tool 31 Control interface Molding section 32 Energy storage Molding 33 Pump

Molded part 34 drive

Holding section 35 Locking element Block 36 Pressure medium line Locking device 37 Drive steep

Drive 38 drive

interface

bending press

(Sub) tool holder

(Whether er) tool holder

Press drive

Buying tool

workpiece

Valve

Pressure fluid channel

First medium pressure medium

Second pressure medium range

Rear sub-equipment

spacer

interface

transmission part

pressing direction

actuator

pump

Traversing drive

Pressure fluid reservoir

control device

Claims

Patent claims

1. A method for adjusting a mold section (2) of a bending tool (1) in a bending press (10) having a press drive (13), characterized in that the adjustment of the mold section (2) of the bending tool (1) by the press drive ( 13) and / or by a travel drive (26) in the bending press (10) relative movement between the bending tool (1) with the mold section to be adjusted (2) and an opposite bending tool (14) in particular in a direction transverse to the pressing direction (25) causes.

2. The method according to claim 1, characterized in that the adjustment of the mold section (2) takes place in that by the press drive (13) and / or by the positioning drive (26) opposing tool holders (11, 12) of the bending press (10). , Preferably an upper tool holder and a lower tool holder, relative to each other, in particular to each other to be moved, wherein the bending tool (1) with the mold section to be adjusted (2) of one of the tool holders (11) is held and on the opposite tool holder (12) with pressure is applied, wherein preferably the opposite tool holder (12) or in the opposite tool holder (12) inserted bending tool (14) or a workpiece (15) abuts against the mold section to be adjusted (2).

3. The method according to claim 1 or 2, characterized in that the adjustment of the mold portion (2) of the bending tool (1) during a bending operation on a workpiece (15) is performed, wherein the workpiece (15) during the adjustment of the mold portion (2 ) is arranged in the bending press (10), preferably between the bending tool (1) with the mold section to be adjusted (2) and an opposite bending tool (14) is clamped.

4. The method according to any one of the preceding claims, characterized in that the mold section (2) of the bending tool (1) forms a die and the adjustment of the mold section (2) comprises an adjustment of the die width of the die.

5. The method according to any one of the preceding claims, characterized in that the bending tool (1) has a holding portion (5) for insertion of the bending tool (1) in a tool holder (11, 12) of the bending press (10) and that the mold section (2 ) of the bending tool (1) at least one relative to the holding section (5) movable molding (3, 4), wherein when adjusting the mold section (2) by the press drive (13) at least one molding (3, 4) relative to the holding portion (5 ) is preferably moved linearly.

6. The method according to claim 5, characterized in that the adjustment of the mold section (2) a displacement of the at least one molded part (3, 4) and / or a

Pivoting of the at least one molded part (3, 4) and / or an inclination of the at least one molded part (3, 4) relative to the pressing direction (25).

7. The method according to any one of the preceding claims, characterized in that the bending tool (1) with the mold section (2) cooperating, preferably hydraulic locking device (7), which secures the mold section (2) against an adjustment in the locked state.

8. The method according to claim 7, characterized in that the locking device (7) is released, that by the press drive (13) opposing tool holders (11, 12) of the bending press (10) are moved towards each other, wherein the bending tool (1). with the mold section to be adjusted (2) is pressurized, and that the locking device (7) after reaching the desired position of the mold section (2) is transferred to the locked state.

9. 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 holder (11, 12) of a bending press (10) and a forming section (2) for forming a workpiece (15), characterized in that the molding section (2) comprises at least one relative to the holding section (5) movable molding (3, 4).

10. Bending tool according to claim 9, characterized in that the workpiece-side area of the mold section (2) and the holding section (5) on opposite sides the bending tool (1) are formed and / or that the mold section (2) is adjustable by pressurizing the bending tool (1) in a direction extending from the workpiece side region of the mold section (2) to the holding section (5).

11. Bending tool according to claim 9 or 10, characterized in that through the mold section (2) of the bending tool (1) a pressing direction is predetermined and that the extension of the bending tool (1) in the pressing direction in a first position of the mold section (2) is larger as in a second position of the mold section (2).

12. Bending tool according to one of claims 9 to 11, characterized in that the bending tool (1) with the mold section (2) cooperating, preferably hydraulic locking device (7), which secures the mold section (2) against an adjustment in the locked state , wherein preferably the locking device (7) in the interior of the bending tool (1) is arranged.

13. Bending tool according to claim 12, characterized in that the locking device (7) has a drive (8), in particular an actuator, an engine, a cylinder or the like., By which the locking device (7) in the locked state and / or in the dissolved state is convertible.

14. Bending tool according to claim 13, 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) on the holding portion (5) of the bending tool (1) is arranged.

15. Bending tool according to one of claims 12 to 14, characterized in that the locking device (7) has a pressure medium channel (17) by an operable valve (16), preferably by a pilot operated check valve, in a first pressure medium region (18) and a second pressure medium region (19) is divided, wherein the first pressure medium region (18) is coupled to the at least one molded part (2).

16. Bending tool according to one of claims 9 to 15, characterized in that the mold section (2) has at least two movable mold parts (3, 4) with the same Locking device (7) cooperate, in particular by a common pressure medium channel (17) are coupled together.

17. Bending tool according to one of claims 9 to 16, characterized in that the bending tool (1) has a rear part device (20), in particular a return spring, for

Resetting of at least one molded part (3, 4).

18. Bending tool according to claim 17, characterized in that the rear part device (20) comprises a force accumulator, in particular a spring, which can be acted upon by a Ver adjusting movement of the at least one molded part (3, 4).

19. Bending tool according to claim 17 or 18, characterized in that the rear part device (20) with the locking device (7) cooperates, preferably to the second pressure medium region (19) of the pressure medium channel (17) is coupled.

20. Bending tool according to one of claims 9 to 19, characterized in that the holding portion (5) is formed on a block (6), wherein the at least one molded part (3, 4) movably mounted in or on the block (6), preferably linearly guided, is.

21. Bending tool according to one of claims 9 to 20, characterized in that the mold section (2) of the bending tool (1) forms a die whose die width is adjustable.

22. Bending tool according to claim 21, characterized in that the shaping section (2) of the bending tool (1) comprises two linearly movable shaped parts (3, 4) which form the die jaws of the die, the directions of movement of the two molded parts (3, 4) V-shaped.

23. Bending tool according to claim 22, characterized in that the bending tool (1) has a spacer (21), preferably in the form of a web, through which the die jaws are spaced from one another.

24. Bending tool according to one of claims 9 to 23, characterized in that the at least one molded part (3, 4) is movable between two stop positions, wherein the one stop position of a fully extended position of the molded part (3, 4) and the other stop position of a completely retracted position of the molded part (3, 4) corresponds.

25. bending press (10) with at least one tool holder (11, 12) and a bending tool (1), characterized in that the bending tool (1) is designed according to one of the preceding claims.

26. Bending press according to claim 25, characterized in that the tool holder (11, 12) for supplying energy to the bending tool (1) has an electrical or electromagnetic interface (22), wherein preferably the tool holder (11, 12) is in the form of a rail and the interface (22) is designed in the form of at least one contact strip extending along and / or in the rail.

27. Use of a bending tool (1) according to any one of claims 9 to 24 in a method according to one of claims 1 to 8.