EP3593918B1 - Roller tool for a machine tool, roller tool system and method for linear forming of a metal sheet - Google Patents

Description

The invention relates to a roller tool for a machine tool for linear forming of a sheet metal. The invention also relates to a roller tool system with such a roller tool and a method for linear forming of a sheet metal with a roller tool.

From the EP 0 714 720 A1 a roller tool system for a machine tool for linear forming of a sheet metal is known, which forms the basis for the preamble of claim 1. Such roller tools are also known from U.S. 5,156,034 A , of the DE 10 2005 003 558 A1 , of the DE 10 2006 049 045 A1 , of the DE 20 2005 021 005 U1 , of the DE 10 2014 224 094 A1 and the US 2007/105488 A1 .

It is an object of the present invention to improve a roller tool. In particular, a roller tool is to be created which can be dimensioned compactly and is particularly robust and flexible in operation. In particular, the roller tool should be designed to reliably ensure the processing of sheet metal with a particularly small sheet metal wall thickness or with a particularly large sheet metal wall thickness, even with high degrees of deformation.

This object is achieved by a roller tool with the features of claim 1. According to the invention, it was recognized that the roller tool with the at least one roller body, which can be rotationally driven by means of a ram of the machine tool via the rotational engagement of the tool head designed as a form-fitting profile, is particularly flexible different machine tools can be operated and can be driven in rotation via the ram in a reliable and low-wear manner. The rotary engagement, which is designed as a form-fit profile, ensures the transmission of particularly high torques as well as slip-free and thus precise control of the feed transmitted to the sheet metal via the at least one roller body. Drive components that are expensive and space-intensive, in particular that can be pivoted with the roller tool in alternating machining directions and / or attached to the roller tool, can be dispensed with. For example, the roller tool can thus be used in a machine turret of common machine tools for receiving different processing tools, in particular roller and punching tools. The transfer of the rotary movement via the tool head, which is to be robustly dimensioned for transferring the pressing force, also enables a particularly compact design of the roller tool. Due to the compact design of the roller tool, a larger number of machining tools can be arranged in the same space, as a result of which the machining performance of the machine tool can be increased. Due to the formation of a single mechanical interface between the machine tool and the roller tool for transmitting both the pressing force and the rotary movement in the form of the tool head, the roller tool can be exchanged particularly easily and quickly. The maintenance effort on the machine and tool side is particularly low.

The roller tool is particularly robust and can be operated safely. With the form-fitting connection between the ram and the tool head, it is particularly advantageous to take structural precautions which enable this connection to be released when predetermined torques are exceeded. To avoid damage to the machine tool and / or on the roller tool, in particular, the safety clutch can be used. The safety coupling can have a drive part and an output part. The drive part can be connected to the tool head such that it can be driven in rotation via a head-coupling connection, in particular via a feather key connection. The safety coupling can be reversibly displaceable between a closed position and an open position. In the closed position, the driven part is preferably connected to the drive part such that it can be driven in rotation. In the open position, the transmission of the rotary movement between the drive part and the driven part can be at least partially, in particular completely, interrupted. The safety coupling is preferably designed to be self-releasing. When the maximum transmissible torque is exceeded, the self-releasing safety clutch is only shifted from the closed position to the open position by the applied torque. Damage to the roller tool due to excessive torque transmitted from the ram to the tool head can thus be prevented. In particular, damage to the machine tool, for example due to the at least one roller body blocking, can also be avoided.

A maximum torque that can be transmitted via the safety clutch can preferably be set. For this purpose, the safety clutch can have a clutch spring, for example. The clutch spring can be steplessly preloaded, in particular by means of a spring nut. The safety clutch is preferably designed as a load-separating, in particular residual torque-free, or as a load-holding, in particular frictional, clutch. According to one aspect of the invention, the safety clutch has a release sensor for detecting a displacement of the safety clutch from a closed position into an open position.

The form-fit profile of the rotary engagement can be designed, for example, as a tongue and groove connection, in particular as a feather key connection, or as a splined shaft connection. The form-fit profile is particularly preferably designed as a single groove extending radially to the longitudinal axis of the tool. The rotary engagement can be designed in the shape of a keyhole in a plan view. The ram of the machine tool can therefore only interact with the rotary engagement in a certain angular position. It is advantageous, in particular for the embossing process, that an orientation of the at least one roller body connected to the tool head can be clearly determined.

The roller tool ensures the precise forming of sheet metal with a particularly small sheet metal wall thickness and / or a particularly large sheet metal wall thickness. The sheet metal wall thickness of the sheet metal to be processed can for example be at most 0.5 mm, in particular at most 0.2 mm, in particular at most 0.1 mm. The sheet metal wall thickness can also be at least 2.5 mm, in particular at least 3 mm, in particular at least 4 mm. In order to reshape the sheet metal, the roller body interacts with the sheet metal by rolling it on it. The at least one roller body preferably transmits at least a portion of the pressing force and the rotary movement, in particular in the form of a feed movement, to the sheet metal. A shifting of the sheet metal relative to the roller tool for linear forming can take place in a particularly powerful and controlled manner by the supporting rotary movement of the at least one roller body. The precise forming of the sheet can thus be carried out independently can be reliably guaranteed by the processing direction, in particular in the case of pulling and / or pushing processing.

The roller tool can be designed as a forming tool for forming the sheet metal and / or as a stamping tool for stamping the sheet metal and / or as a cutting tool for cutting the sheet metal. The roller tool designed as a forming tool can be designed, for example, to form beads.

According to one aspect of the invention, the rotary engagement is designed for reversible cooperation with the tool head. This is understood to mean that the ram can be reversibly connected to the tool head via the rotary engagement. For example, the rotary engagement can have a clamping surface for frictional connection with the plunger. The roller tool can thus be arranged in the machine turret of the machine tool and can be changed automatically.

The at least one roller body is preferably mounted on the housing so as to be rotatable about an axis of rotation oriented vertically to the longitudinal axis of the tool. A machining direction in which the sheet metal is displaced relative to the roller tool during forming is preferably oriented perpendicular to the longitudinal tool axis and perpendicular to the axis of rotation of the at least one roller body.

According to one aspect of the invention, the roller tool has at least two, in particular at least three, in particular at least four, roller bodies which can be driven in rotation via the tool head. The plurality of roller bodies can be driven via a common roller shaft. Alternatively, at least two of the roller bodies are independent of one another rotatable. For example, the at least two roller bodies can be connected to one another via a transmission, in particular a differential. This advantageously means that the sheet metal can be machined in a particularly flexible and precise manner.

According to one aspect of the invention, the housing has an index engagement for rotating the roller tool about the tool longitudinal axis by means of an index drive of the machine tool. For linear deformation of the sheet metal along a curved deformation path, the roller tool can be rotated relative to the roller tool in accordance with the displacement of the sheet metal. In particular, the axis of rotation of the at least one roller body can be oriented perpendicular to the machining direction.

According to a further aspect of the invention, the roller tool comprises a lubricating device for lubricating the movably mounted components, in particular the at least one roller body. The tool head can have a head bore for supplying cooling lubricant via the ram into the roller tool. The head bore can penetrate the tool head concentrically to the tool longitudinal axis. According to one aspect of the invention, the roller shaft has a lubricant channel for lubricating a rotary bearing formed between the roller shaft and the housing. The bearing of the roller shaft and the housing is therefore particularly low in friction and wear.

A roller tool according to claim 2 is particularly low-friction and can therefore be operated efficiently. By means of the bevel gear and / or the worm gear, the rotary movement about the tool longitudinal axis can be converted into a rotary movement oriented at an angle to it, in particular oriented perpendicular to it to be converted. The bevel gear and / or the worm gear can be designed as an angular gear for this purpose. A transmission ratio of the bevel gear and / or the worm gear is preferably at most 5, in particular at most 3, in particular at most 2, in particular at most 1.5. A transmission ratio of the bevel gear and / or the worm gear is preferably 1. The rotary movement in the tool longitudinal axis can thus be converted into the rotary movement of the roller shaft oriented perpendicular thereto with particularly low friction.

A roller tool according to claim 3 can be dimensioned to be particularly compact. At least one, in particular at least two, spur gears for transmitting the rotary movement are preferably arranged between the tool head and the roller body. Regardless of a diameter of the at least one roller body, the at least one spur gear and / or the bevel gear and / or the worm gear, in particular their gears, can be dimensioned to be particularly compact. Preferably, a maximum diameter of each pinion of the at least one spur gear is at most as large as a maximum diameter of the at least one roller body.

A roller tool according to claim 4 can be dimensioned to be particularly compact. The roller tool preferably comprises at least one roller shaft for carrying the at least one roller body and at least one, in particular at least two, in particular at least three pinion shafts oriented perpendicular to the tool longitudinal axis for carrying at least one pinion. The at least one roller shaft and the at least one pinion shaft are preferably arranged at a distance from one another, in particular along the tool longitudinal axis. The at least two Shafts can be rotatably mounted on the housing for transmitting the rotary movement.

According to one aspect of the invention, at least one of the shafts, in particular the at least one roller shaft and / or the at least one pinion shaft, has a bevel gear notch. The roller shaft and / or the pinion shaft preferably overlap a bevel gear of the bevel gear mechanism along their direction of rotation. As a result, the roller tool can be dimensioned in a particularly compact manner.

A roller tool according to claim 5 is particularly robust and can be operated safely. The direct connection is to be understood in particular as the fact that no torque-speed conversion takes place between the tool head and the drive part. The drive part is preferably connected to the safety coupling in a gear-free and / or non-rotatable manner, in particular rigidly. The output part can be connected to the at least one roller body such that it can be driven in rotation. Arranging the safety coupling directly on the tool head prevents damage to the roller tool on the output side, in particular damage to the bevel gear and / or the spur gear or blocking of the at least one roller body, from overloading the components on the drive side. Damage to a ram drive of the machine tool can thus be reliably prevented.

A roller tool according to claim 6 ensures precise and efficient forming of the sheet metal. The roller device preferably comprises at least one, in particular at least two, in particular at least three, in particular at least five, in particular transversely to the tool longitudinal axis, rotatably mounted auxiliary roller bodies. Becomes beneficial This ensures that workpiece deformation can also take place precisely along a strongly curved deformation path. The at least one secondary roller body can be arranged at a distance from the roller body. In particular, a roller sleeve can be arranged between the roller body and the at least one secondary roller body. Alternatively, the at least one secondary roller body can be arranged directly next to the roller body.

A circumferential contour of the at least one roller body and / or of the at least one secondary roller body preferably corresponds to a shape to be transferred to the sheet metal. The at least one secondary roller body is preferably not driven.

A roller tool according to claim 7 can be operated particularly efficiently and with little wear. The roller shaft preferably comprises a lubricant reservoir in the form of a central bore. The lubricant channel created in the roller shaft can connect the lubricant reservoir to a bearing point of the roller shaft and / or of the at least one secondary roller body and / or the roller sleeve in a lubricant-conducting manner.

The invention is also based on the object of creating a roller tool system which can be dimensioned compactly and is particularly robust and flexible in operation. Furthermore, a roller tool system is to be created which is designed for forming metal sheets with a particularly small sheet metal wall thickness or a particularly large sheet metal wall thickness.

This object is achieved by a roller tool system with the features of claim 8. The advantages of the roller tool system according to the invention correspond to the advantages of the roller tool already described. The counter roller tool preferably comprises at least one, in particular at least two, in particular at least three, in particular at least five counter rollers rotatably mounted on a counter roller axis. The at least one counter roller is preferably designed as a forming roller. The at least one forming roller is characterized in that it has a circumferential geometry which can be transferred to the sheet metal during the forming process. Alternatively, the at least one roller body and / or the at least one secondary roller body can also be designed as a forming roller. The at least one counter-roller can be designed as a counter-roller body. The at least one counter roller body is characterized in that it is designed to guide the sheet metal, in particular to hold down the sheet metal, during the forming.

According to one aspect of the invention, the at least one counter roller can be driven in rotation. For this purpose, the counter-roller tool can have a counter-roller drive which is connected to the at least one counter-roller so that it can rotate.

The invention is also based on the object of improving a method for linear forming of a sheet metal.

This object is achieved by a method with the features of claim 9. The advantages of the method according to the invention correspond to the advantages of the roller tool or roller tool system already described. According to one aspect of the invention, the sheet metal is displaced in a pulling and / or pushing manner relative to the roller tool. A pulling displacement of the sheet metal is understood to mean that the sheet is pulled away in the direction of the roller tool. Pushing processing means that the sheet metal is pushed in the direction of the roller tool. For this purpose, the sheet metal can be fastened to a positioning device, in particular a sheet metal clamping means, of the machine tool. During the pulling process, the sheet metal clamping device is moved away from the roller tool. In the case of pushing machining, the sheet metal clamping device is moved in the direction of the roller tool. Alternatively, the sheet metal clamping means can be moved parallel to the machining direction for displacing the sheet metal relative to the roller tool.

The process is particularly robust in operation. When the maximum transmittable torque is exceeded, the safety clutch is preferably transferred from the closed position to the open position. The torque transmission between the tool head and the at least one roller body can be interrupted, in particular completely separated or reduced to a constant residual torque.

A method according to claim 10 ensures particularly precise machining of the sheet metal. The rotary drive of the roller body can be coupled to the displacement of the sheet metal relative to the roller tool. For this purpose, the ram drive and the positioning device can be in signal connection with a control device of the machine tool. The index drive for driving the roller tool system in rotation about the tool longitudinal axis is preferably also in signal connection with the control device. The index drive and / or the ram drive and / or a positioning drive of the positioning device are preferably operated in a coordinated manner by means of the control device. The rotational movement of the roller body and the orientation of the axis of rotation of the roller body can thus be matched to the movement of the sheet metal relative to the roller tool. Buckling and / or creasing of the sheet metal can thus be reliably prevented even with high degrees of deformation.

• Fig. 1 Eine Seitenansicht einer schematisch dargestellten Werkzeugmaschine mit einem erfindungsgemäßen Rollenwerkzeugsystem,
• Fig. 2 eine perspektivische Darstellung des Rollenwerkzeugsystems in Fig. 1 von schräg unten mit einem Rollenwerkzeug und einem Gegenrollenwerkzeug, wobei das Rollenwerkzeug eine Rolleneinrichtung mit einem drehantreibbaren Rollenkörper zum Zusammenwirken mit einem Blech aufweist,
• Fig. 3 eine perspektivische Darstellung des Rollenwerkzeugsystems in Fig. 1 von schräg oben, wobei das Rollenwerkzeug einen Werkzeugkopf mit einem Dreheingriff zum Übertragen einer Drehbewegung von einem Stößel der Werkzeugmaschine auf den Werkzeugkopf aufweist,
• Fig. 4 eine Schnittdarstellung des Rollenwerkzeugsystems entlang der Schnittlinie IV-IV in Fig. 2 durch eine Werkzeuglängsachse, wobei das Blech zum linienhaften Umformen zwischen dem Rollenwerkzeug und dem Gegenrollenwerkzeug angeordnet ist,
• Fig. 5 eine Schnittdarstellung des Rollenwerkzeugsystems entlang der Schnittlinie V-V in Fig. 4 parallel und beabstandet zu der Werkzeuglängsachse, wobei eine Sicherheitskupplung des Rollenwerkzeugs nicht geschnitten dargestellt ist und
• Fig. 6 eine Schnittdarstellung des Rollenwerkzeugsystems entlang der Schnittlinie VI-VI in Fig. 4 mit dem entlang eines Umformpfads linienhaft umgeformten Blech.

Further features, advantages and details of the invention emerge from the following description of an exemplary embodiment. Show it:

• Fig. 1 A side view of a schematically illustrated machine tool with a roller tool system according to the invention,
• Fig. 2 a perspective view of the roller tool system in FIG Fig. 1 from diagonally below with a roller tool and a counter roller tool, the roller tool having a roller device with a roller body that can be driven in rotation for interacting with a sheet metal,
• Fig. 3 a perspective view of the roller tool system in FIG Fig. 1 from obliquely above, wherein the roller tool has a tool head with a rotary engagement for transmitting a rotary movement from a ram of the machine tool to the tool head,
• Fig. 4 a sectional view of the roller tool system along the section line IV-IV in Fig. 2 through a tool longitudinal axis, where the sheet metal for linear forming is arranged between the roller tool and the counter roller tool,
• Fig. 5 a sectional view of the roller tool system along the section line VV in Fig. 4 parallel to and at a distance from the tool's longitudinal axis, a safety coupling of the roller tool not being shown in section and
• Fig. 6 a sectional view of the roller tool system along the section line VI-VI in Fig. 4 with the sheet metal formed linearly along a forming path.

A machine tool 1 as in the Fig. 1 shown, comprises a frame structure 2, a machine turret 3 connected to it for receiving machining tools 4, a machining table 5 for supporting a sheet metal 6 to be machined and a positioning device 7 for displacing the sheet metal 6 relative to the machining table 5.

The positioning device 7 comprises a positioning drive 8 which is in operative connection with a sheet metal clamping means 9. The sheet metal 6 is reversibly attached to the sheet metal clamping means 9 and can be displaced relative to the machining table 5 by means of the positioning drive 8.

An actuating means 11 with a plunger 12 is arranged on an upper frame part 10 of the frame structure 2. Via the ram 12, the actuating means 11 interacts with the respective machining tool 4 arranged below it. For this purpose, the ram 12 can be displaced in the vertical direction in order to exert a pressing force F on the machining tool 4 and rotatable about a vertical axis to transmit a rotary movement to the machining tool 4.

The machine turret 3 is mounted on the frame structure 2 such that it can be driven in rotation. By rotating the machine turret 3, different machining tools 4 can be arranged under the actuating means 11.

The machining tool 4 arranged below the actuation means 11 is designed as a roller tool system 13. The roller tool system 13 comprises a roller tool 14 and a counter-roller tool 15. The sheet metal 6 is arranged between the roller tool 14 and the counter-roller tool 15.

The roller tool system 13 is in the Fig. 2 further shown in detail. The roller tool 14 has a housing 16, a tool head 18 rotatably mounted relative to the housing 16 about a tool longitudinal axis 17, and a roller device 19 connected to the housing 16 for interacting with the sheet metal 6.

As in particular from the Fig. 3 As can be seen, the tool head 18 comprises an abutment surface 20 and a rotary engagement 21 for reversible interaction with the plunger 12. The abutment surface 20 is designed so that the contact pressure F, which is oriented parallel to the longitudinal tool axis 17, can be transmitted from the plunger 12 to the tool head 18 via this . The rotary movement about the tool longitudinal axis 17 can be transmitted from the ram 12 to the tool head 18 via the rotary engagement 21. The rotary engagement 21 is for form-fitting interaction with the plunger 12 about the tool longitudinal axis 17 as a radial to the tool longitudinal axis 17 formed extending groove. To form the rotary engagement 21, the tool head 18 thus has a keyhole-shaped recess.

In the Fig. 4 a longitudinal section of the roller tool system 13 through the tool longitudinal axis 17 is shown. The tool head 18 is rotatably mounted about the tool longitudinal axis 17 on a housing upper part 23 of the housing 16 via a head bearing 22. The head bearing 22 is designed as a ball bearing. The upper housing part 23 is non-positively connected to a lower housing part by means of a housing screw connection 24. The lower housing part 25 has a housing flange 26 for connection to the machine turret 3. By means of an index drive, not shown, of the machine tool 1, the housing 16 can be driven to rotate about the tool longitudinal axis 17, in particular via the upper housing part 23 relative to the machine turret 3.

The tool head 18 is non-rotatably connected to a safety coupling 27. The safety coupling 27 has a drive part 28 and an output part 29. The drive part 28 is in a rotationally fixed connection with the tool head 18 via a head-coupling connection 30. The head-to-coupling connection 30 comprises a keyway connection. The safety coupling 27 can be arranged in a closed position and in an open position. In the closed position, the output part 29 is non-rotatably connected to the drive part 28. In the open position, the output part 29 can be rotated relative to the drive part 28 about the tool longitudinal axis 17. The safety coupling 27 is designed in such a way that it can be displaced between the closed position and the open position depending on the torque applied to the drive part 28. When a maximum transmittable torque is exceeded, the safety clutch 27 is automatically shifted from the closed position into the open position. The safety clutch 27, in particular the output part 29, is in a rotationally transmitting connection with a gear unit 32 via a clutch-gear connection 31. The clutch-gear connection 31 comprises a feather key connection for the positive transmission of the rotary movement from the safety clutch 27 to the gear unit 32. This gear device 32 has two pinion shafts 33, 34 rotatably mounted on the housing 16, in particular on the lower housing part 25. An axis of rotation of the respective pinion shaft 33, 34 is oriented perpendicular to the tool longitudinal axis 17. The pinion shafts 33, 34 are rotatably mounted on the lower housing part 25 via plain bearing bushes 35. In the axial direction, the pinion shafts 33, 34 are fastened to the lower housing part 25 by means of retaining rings 36.

To drive the upper pinion shaft 33 in rotation, the output part 29 is in a rotationally drivable connection with the upper pinion shaft 33 via a bevel gear 37. A diameter D _{KK of} a coupling bevel gear 38 arranged on the safety clutch 27 is 15% smaller than a diameter D _{RK of} one on the upper pinion shaft 33 arranged pinion bevel gear 39. The pinion bevel gear 39 is positively connected to the upper pinion shaft 33 via a feather key connection.

To transmit the rotational movement from the upper pinion shaft 33 to the lower pinion shaft 34, the upper pinion shaft 33 has an upper spur gear 40 connected to it in a rotationally fixed manner, and the lower pinion shaft 34 has a lower spur gear 41 connected to it in a rotationally fixed manner. A diameter D _{OS of} the upper spur gear 40 is equal to a lower diameter D _{US of} the lower spur gear 41. The lower pinion shaft 34 has a bevel gear notch 42 in the area of the pinion bevel gear 39. In a side view towards of the axis of rotation of the lower pinion shaft 34, the lower pinion shaft 34 and the pinion bevel gear 39 overlap each other.

The transmission device 32 comprises a roller shaft 43 rotatably mounted on the housing 16, in particular on the housing lower part 25. The roller shaft 43 is axially fixed to the housing lower part 25 by means of securing rings 36. The roller shaft 43 is connected to the lower pinion shaft 34 in a rotationally drivable manner via a roller pinion 44 connected to it in a rotationally fixed manner and the lower spur gear 41.

In order to interact with the sheet metal 6, the roller device 19 comprises a roller body 45. The roller body 45 is non-rotatably connected to the roller shaft 43 via a feather key connection. The roller body 45 is connected to the tool head 18 such that it can be driven in rotation via the gear mechanism 32 and the safety coupling 27. In order to interact with the sheet metal 6, the roller body 45 has a hardened metallic surface.

The roller device 19 has a roller sleeve 46 and a secondary roller body 47. The roller sleeve 46 and the sub-roller body 47 are rotatably supported on the roller shaft 43. The secondary roller body 47 has a surface made of a hardened metallic material for cooperation with the sheet metal 6.

The tool head 18 has a head bore 48 for supplying cooling lubricant from the ram 12 to the roller tool 14. The roller shaft 43 comprises a lubricant channel 49. The lubricant channel 49 comprises a central bore 50 which is arranged concentrically to the roller shaft 43 and extends radially between the central bore 50 and the lower housing part 25, the roller sleeve 46 and the secondary roller body 47 extending branch channels 51. A lubricating nipple 52 for introducing lubricant into the lubricant channel 49 is arranged on the central bore 50.

The counter roller tool 15 comprises a counter roller axis 53. The counter roller axis 53 is attached to a counter housing 54 in a rotationally fixed manner. A forming roller 55 and two counter-roller bodies 56, 57 arranged adjacent thereto are rotatably mounted on the counter-roller axis 53. The forming roller 55 and the two counter-roller bodies 56, 57 are designed to interact with the sheet metal 6. For this purpose, the forming roller 55 and the counter-roller bodies 56, 57 have a hardened metallic surface.

The counter-roller axle 53 comprises a counter-lubricant channel 58, which is connected to the forming roller 55 and the counter-roller bodies 56, 57. Lubricant can be introduced into the counter-lubricant channel 58 via a lubricating nipple 52.

The counter housing 54 is mounted on the machine tool 1 so as to be rotatable relative to the machine turret 3. The counter housing 54 can be driven in rotation via a drive engagement 59 by means of the index drive.

The functioning of the roller tool system 13 with the roller tool 14 and the counter roller tool 15 is as follows:
The roller tool system 13 is initially arranged in a reset position. In the reset position, the roller tool system 13 is arranged below the actuating means 11, the tool head 18 being arranged below the ram 12. The sheet 6 is between the roller tool 14 and the counter roller tool 15 arranged. The roller tool 14 is arranged at a distance from the sheet metal 6, in particular in the vertical direction.

By actuating the positioning device 7, the sheet metal 6 is displaced relative to the roller tool system 13. A region of the sheet metal 6 to be processed is arranged above the forming roller 55 in the vertical direction.

For the linear reshaping of the sheet metal 6, the roller tool 14 is displaced downward in the vertical direction by means of the ram 12. For this purpose, the ram 12 interacts with the abutment surface 20 of the tool head 18. The pressing force F is transmitted from the ram 12 to the sheet metal 6 via the tool head 18, the housing 16, the roller shaft 43, as well as the roller body 45 and the auxiliary roller body 47. The roller tool 14 is in the working position.

The sheet metal 6 is guided between the roller body 45 and the first counter-roller body 56 and between the secondary roller body 47 and the second counter-roller body 57. The sheet metal 6 is reshaped by means of the shaping roller 55.

For linear reshaping of the sheet metal 6, it can be displaced relative to the roller tool system 13 by means of the positioning device 7. The sheet metal 6 is displaced essentially perpendicular to the tool longitudinal axis 17 and the axis of rotation of the roller shaft 43 relative to the roller tool system 14. For this purpose, the sheet metal clamping means 9 can be displaced in any direction relative to the roller tool system 13, in particular in the direction of the roller tool system 13.

By displacing the sheet metal 6 relative to the roller tool system 13 arranged in the working position along a forming path 60, the sheet metal 6 is reshaped, in particular in the form of a bead. The roller body 45, the secondary roller body 47, the first counter-roller body 56, the second counter-roller body 57 and the forming roller 55 roll on the sheet metal 6. The deformation path 60 is curved. By rotating the roller tool system 13 by means of the indexing drive, in particular while the sheet metal 6 is being displaced relative to the roller tool system 13, the sheet metal 6 is deformed along a curved line.

The rotary movement is transmitted from the ram 12 to the tool head 18 via the rotary engagement 21. The rotary movement is transmitted from the tool head 18 via the safety coupling 27 and the gear mechanism 32 to the roller body 45. The rotational movement of the roller body 45 is coordinated with the displacement of the sheet metal 6 relative to the roller tool system 13. In particular, the rotary movement of the roller body 45 is coordinated with the rotary movement of the roller tool system 13 relative to the sheet metal 6. For this purpose, the index drive, the actuation means 11 and the positioning device 7 are in signal connection with a control device of the machine tool 1.

In a curved area of the forming path 60, the roller body 45 is driven in such a way that a circumferential rolling speed of the roller body 45 is smaller or greater than a relative speed of the roller tool system 13 in the area of the tool longitudinal axis 17 relative to the sheet 6 the relative speed between the metal sheet 6 and the roller tool system 13. This enables particularly thick metal sheets 6, in particular with a sheet metal wall thickness t of more than 2.5 mm, can be reliably formed. Thin metal sheets 6 with a sheet metal wall thickness t of at most 0.5 mm can be formed reliably without creasing.

During the forming process, cooling lubricant is fed to the roller tool system 13 via the head bore 48. To reduce friction and wear, lubricant is applied via the lubricant channel 49 and the counter-lubricant channel 58 between the roller shaft 43 and the roller sleeve 46, the secondary roller body 47 and the lower housing part 25 and between the counter-roller axle 53 and the counter-roller body 56, 57 and the forming roller 55.

When a maximum torque that can be transmitted between the tool head 18 and the roller body 45, in particular between the drive part 28 and the driven part 29, is exceeded, the safety coupling 27 is shifted from the closed position into the open position. In the open position, the drive part 28 is rotatable relative to the driven part 29, the transmission of the rotary movement between the tool head 18 and the roller body 45 being interrupted.

The roller tool system 13 with the roller body 45 which can be rotated via the tool head 18 is compactly dimensioned, robust in operation and can be used particularly flexibly. The roller tool system 13 enables the linear deformation of the sheet metal 6 along the straight and / or curved deformation path 60 in a flexible and reliable manner, in particular sheets 6 with a particularly small sheet metal wall thickness t of at most 0.5 mm and sheets 6 with a particularly large sheet metal wall thickness t of at least 2.5 mm can be deformed. Here, the roller tool system 13 can be used for forming the sheet metal 6 in any direction relative to the sheet metal clamping means 9, in particular in the direction of the sheet metal clamping means 9, without buckling or creasing of the sheet metal 6 occurring.

Claims (10)

1. Roller tool for a machine tool for the linear forming of a metal sheet, having

   - a housing (16),

   - a tool head (18) for reversibly interacting with a ram (12) of the machine tool (1) which is mounted so as to be rotatable relative to the housing (16) about a tool longitudinal axis (17), having

   -- an impact face (20) for transmitting a contact pressure force (F) that is oriented so as to be parallel to the tool longitudinal axis (17) from the ram (12) to the tool head (18) and

   -- a rotary engagement (21) for transmitting a rotating movement about the tool longitudinal axis (17) from the ram (12) to the tool head (18),

   - a roller installation (19) for interacting with the metal sheet (6), having

   -- at least one roller body (45) that is capable of being rotatably driven by way of the tool head (18);

   characterized in that

   - a safety clutch (27) for limiting a maximum torque transmittable between the tool head (18) and the at least one roller body (45), and

   - the rotary engagement (21) is configured as a form-fit profile for transmitting the rotating movement in a form-fitting manner from the ram (12) to the roller tool (14).
2. Roller tool according to Claim 1, characterized by a bevel gear mechanism (37) and/or a worm gear mechanism for transmitting the rotating movement between the tool head (18) and the roller body (45).
3. Roller tool according to Claim 1 or 2, characterized by a spur gear mechanism (40, 41, 44) for transmitting the rotating movement between the tool head (18) and the roller body (45).
4. Roller tool according to one of the preceding claims, characterized by at least two shafts (33, 34, 43) which for transmitting the rotating movement between the tool head (18) and the roller body (45) are oriented so as to be perpendicular to the tool longitudinal axis (17) and are disposed so as to be mutually spaced apart along the tool longitudinal axis (17).
5. Roller tool according to one of the preceding claims, characterized in that a driving part (26) of the safety clutch (27) is connected directly to the tool head (18).
6. Roller tool according to one of the preceding claims, characterized in that the roller installation (19) has a secondary roller body (47) which for interacting with the metal sheet (6) is mounted on a roller shaft (43) that transmits the rotating movement so as to be rotatable relative to the roller body (45).
7. Roller tool according to Claim 6, characterized by a lubricant duct (49) which for feeding lubricant to the secondary roller body (47) is incorporated in the roller shaft (43).
8. Roller tool system having

   - a roller tool (14) according to one of Claims 1 to 7; and

   - a counter roller tool (15) having

   -- a counter housing (54);

   -- at least one counter roller (55, 56, 57) which for interacting with the metal sheet (6) is mounted so as to be rotatable in the counter housing (54).
9. Method for the linear forming of a metal sheet, comprising the steps:

   - providing a roller tool (14) for a machine tool (1), having

   -- a tool head (18) and

   -- a roller installation (19) having at least one roller body (45);

   - providing the metal sheet (6);

   - pressing the roller body (45) onto the metal sheet (6) by exerting a contact pressure force (F) from a ram (12) of the machine tool (1) onto the tool head (18);

   - rotatingly driving the roller body (45) that interacts with the metal sheet by transmitting a rotating movement in a form-fitting manner from the ram (12) to a rotary engagement (21) of the tool head (18) that is configured as a form-fit profile;

   - repositioning the metal sheet (6) relative to the roller tool (14) for forming the metal sheet (6) in a linear manner,

   - wherein a maximum torque transmittable between the tool head (18) and the roller body (45) is limited by means of a safety clutch (27).
10. Method according to Claim 9, characterized in that the rotating driving of the roller body (45) is performed so as to be adapted to the repositioning of the metal sheet (6) relative to the roller tool (14).

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