• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for operating a machine tool with a stop device (15), wherein at least one stop finger (18) of the stop device (15) by means of a traversing device (23) along a movement path (24) is moved forward and wherein by means of a monitoring device (38) is continuously checked whether an obstacle (44) is in the movement path (24). If such an obstacle (44) is detected, the at least one stop finger (18) and its traversing device (23) are quickly cleared or retracted along the movement path (24), the force being provided for the retraction movement via a retraction device (29) , which is formed by the traversing device (23) independently and can perform the rapid retraction movement in exactly one direction. Furthermore, a machine tool for implementing the method is specified. As a result, a method for operating a machine tool or a machine tool is provided with which or the damage and injuries are avoided and at the same time the efficiency of the machine tool is not reduced by the necessary protective measures.
    公开号:AT511451A4
    申请号:T15582011
    申请日:2011-10-25
    公开日:2012-12-15
    发明作者:
    申请人:Trumpf Maschinen Austria Gmbh；
    IPC主号:
    专利说明:

    1 ♦ ♦ · * · · 1
    The invention relates to a method for operating a machine tool with a stop device for positioning a workpiece in a processing region of the machine tool. In the method, at least one stop finger of the stop device is moved by means of a traversing device along a movement path forward in the direction of the processing area in a stop position. In this case, it is continuously checked by means of a monitoring device, whether an obstacle is in the movement path of the at least one stop finger and it is triggered by the monitoring device, a protective function when such an obstacle is detected. Furthermore, a machine tool for implementing the method is specified.
    For example, by incorrectly specifying the target position of a stop finger of the stop device or by carelessness of an operator may cause collisions of the Anschiagfingers with a part of the machine tool or even with the operator. Such collisions can lead to damage to the machine tool and in the worst case to injuries to the operator.
    To prevent damage and injuries, a frequent countermeasure is to reduce the travel speed of the stop finger, allowing more time to respond to a hazardous situation. In particular, such a speed reduction is provided at least in the vicinity of a pinch or shear point, preferably at a distance of 50 mm and less. Due to the reduction of the travel speed, however, the cycle cycle time for a working process of the machine tool, in which the N2008 / 31500 - 2 *
    Impact device or the stop finger must be adjusted during the process, extended and thus reduces the production speed.
    Another known safety measure is to continuously monitor the movement of the stop finger of the stop device and to stop the stop finger when hitting an obstacle or to reverse its direction of movement by the drive means of the stop finger is driven accordingly. For safe stopping or the fastest possible reversal of the direction of movement of the stop finger in the event of danger! a traversing device with a higher dynamic than normal operation is necessary, the drive means of the traversing device for such a case must be made correspondingly stronger and more robust. This design of the traversing device for the danger case has an oversizing and thus efficiency reduction for the normal operation of the machine tool result.
    From JP 7-275950 A a stop finger for a bending machine is known, which, if necessary, for example, if a workpiece can not be positioned due to its dimensions or only in a relatively complicated manner in the processing area of the bending machine, pulled up and folded back by an actuator becomes. Before carrying out the bending operation, the stop finger is returned to its position by the actuator, so that it can serve as a stop device. Moving the stop finger along a movement path to before and in particular also back is not provided. Likewise, it is not intended to fold back the stop finger when a dangerous situation occurs in connection with the stop finger.
    The present invention has for its object to provide a method for operating a machine tool with a stop device, are avoided with the damage and injury and at the same time the efficiency of the machine tool by the necessary protective measures is not reduced, Moreover, it is an object of the invention to provide a machine tool with a stop device with which the stated objects are achieved. N2008 / 31500 * * # ·
    The first object of the invention is achieved by a method of the type mentioned, in which by the execution of the protective function a fast retraction or retraction of the at least one stop finger and the traversing device along the trajectory back, is caused away from the processing area and wherein the force for the retraction movement is provided by means of a retraction device which is designed independently of the traversing device and can execute the rapid retraction movement in exactly one direction.
    In this way, collisions of the at least one stop finger with an obstacle and thus damage to the machine tool or injury to an operator are actively prevented and not only extends the reaction time to collision. Moreover, it is particularly advantageous, the traversing device, with which the at least one stop finger in normal operation along the trajectory or movement axis is moved back and forth and the retraction device, with which the at least one stop finger and its traversing device upon detection of an obstacle along the trajectory , is moved away from the machining area to decouple. This makes it possible to optimally match both devices to their respective requirements. In the case of the displacement device, the exact, in particular CNC-supported, positioning of the at least one stop finger and its movability in both directions along the movement path is the focus of interest. In the retraction device, a fast and highly dynamic mobility of the at least one stop finger along the movement path in one direction, namely away from the processing area, is of central importance. Furthermore, a simple and robust construction of the traversing device and the entire stop device is ensured by the retraction or retraction of the at least one stop finger together with the traversing device, which is operatively connected to the at least one stop finger. It is expedient for the at least one stop finger to be moved by the travel device in the direction of the processing region at a normal travel speed, in particular at more than 2 m / min. In this way, the cycle times of a machining process of the machine tool N2008 / 31500 ne are not extended compared to security solutions that require a reduced travel speed of at least one stop finger. In this context, it should be noted that the movement of the at least one stop finger back, is performed away from the processing area with normal travel speed. It is also favorable if, during the rapid retraction or retraction of the at least one abutment finger and its traversing device, the at least one abutment finger and its traversing device are at least within a time span corresponding to the human reaction time during reflex movements, preferably within 100 ms, in particular within 75 ms 5 mm, preferably at least 10 mm, in particular at least 25 mm away from the processing area. As a result, a sufficiently high dynamics of the retraction device is given to prevent damage and injury can be reliably.
    Moreover, it is particularly favorable if the force for the return movement is provided by means of at least one pneumatic muscle, which is optionally equipped with a return spring. A pneumatic muscle comprises a pressure-resistant tube element made of a high-strength tissue. When compressed air is applied to the hose element, it expands in the transverse direction and contracts in the longitudinal direction, the working stroke being used along the longitudinal direction. Due to the low mass of a pneumatic muscle and the resulting very large force-to-weight ratio, very high acceleration values of up to 50 m / s 2 can be achieved. At the same time a space-saving retraction device can be formed by the small dimensions of a pneumatic muscle.
    A combination of the at least one pneumatic muscle with a return spring has the advantage that the moving parts of the machine tool, in particular the at least one stop finger and its traversing device are moved back in a passive manner in its original position before the retraction movement when the pneumatic muscle has been disabled. Of course, such a return spring also N2008 / 31500
    be used in a different design retraction devices without a pneumatic muscle.
    It is advantageous if a presence of an obstacle is detected by the monitoring device by continuously measuring a counterforce on the at least one stop finger and by comparing the measured counterforce with a predefined, representing the maximum allowable counterforce threshold. These measures ensure that the protective function is executed only when the stop finger strikes a stationary obstacle and thus the number of false triggering of the protective function is minimized. Due to the pre-definable threshold, a flexible adaptation of the machine tool to different conditions and safety standards is possible.
    It is also advantageous if the counterforce is detected with at least one force measuring element on or in at least one stop finger and / or if the opposing force is detected by evaluating the actual value of an adjusting force in a force control loop of the traversing device, which traversing device the at least one stop finger with the help of the force control loop emotional. By these measures, the accurate and reliable determination of the reaction force on the at least one stop finger is ensured in a simple manner. It is advantageous if the counterforce by detecting the pressure or pressure increase in at least one pneumatic muscle with at least one pressure sensor and optionally by additionally detecting the distance covered or the position of the at least one stop finger with at least one path or. Position sensor and by calculating the drag force from these detected data is determined. In such an embodiment, no sensor element for measuring force on or in at least one stop finger are needed. In addition, the opposing forces are monitored in this way on all parts of the machine tool moving from the pneumatic muscle to at least one stop finger. By evaluating the data of at least one displacement or position sensor, which determines the distance covered or the position of the at least one stop finger, the triggering of the protective function can still be triggered N2008 / 31500 * ·
    be adjusted. For example, it can be used to prevent the protective function from being performed when the stop finger is completely retracted. It is also favorable if the threshold value which the counterforce must at least reach in order for the protective function to be triggered is set to a value of 150 N. This setting is a good compromise to avoid false tripping of the protective function on the one hand and the prevention of injury and damage on the other.
    It is advantageous if the protective function is triggered before the threshold value is reached, since thereby exceeding the maximum counterforce on the at least one stop finger during the braking operation, direction change and acceleration process in the opposite direction is prevented.
    It is advantageous in this connection if the protective function is triggered when at least 90% of the threshold value, in particular at least 95% of the threshold value, occurs when a counterforce occurs. By these measures it is ensured that during the time in which the direction of movement of the at least one stop finger is reversed and thus the at least one stop finger slightly still moves forward toward the processing area, defined by the threshold maximum drag on the at least one stop finger is not exceeded.
    The object of the invention, in particular the second mentioned object of the invention, is solved independently by a machine tool with a stop device for positioning a workpiece in a processing area, which stop device comprises at least one stop finger, which is movably mounted on a finger carrier and by means of a drive means Moving device along a trajectory back and forth is movable. The drive means is fixedly connected to the finger carrier. Furthermore, the machine tool comprises a monitoring device, with which during a movement of the at least one stop finger along the movement path can be continuously checked before in the direction of the processing area in a stop position, whether an obstacle in the trajectory of N2008 / 31600
    If this is the case, then a protective function can be triggered by the monitoring device, since a retraction actuator of a retraction device is directly or indirectly operatively connected to the finger carrier movable along the movement path. Thus, as a protective function, a fast retracting or retracting the at least one stop finger and its traversing along the trajectory back away from the processing area executable by the retraction actuator moves the finger carrier and thus the at least one stop finger and the traversing device away from the processing area, for the retraction actuator the fast withdrawal movement is executable only in this direction.
    In this way, collisions of the at least one stop finger with an obstacle and thus damage to the machine tool or injury to an operator are actively prevented and not only extends the reaction time to collision. Moreover, it is particularly advantageous, the Verfahrvor-direction, with which the at least one stop finger in normal operation along the trajectory or movement axis by the drive means is moved back and forth and the retraction device, with which the at least one stop finger and its traversing device when detecting a Obstacle by means of the retraction actuator along the trajectory back, is moved away from the processing area, to decouple. This makes it possible to optimally match both devices and in particular the drive means of the traversing device or the retraction actuator of the retraction device to their respective requirements. In the traversing device and in particular in its drive means is the exact, in particular CNC-supported positioning of the at least one stop finger and its mobility in both directions along the trajectory in the center of interest. In the retraction device and in particular in its retraction actuator is a fast and highly dynamic mobility of the at least one stop finger along the movement path in one direction, namely away from the processing area, of central importance. Furthermore, by the retraction or retraction of the movable finger carrier and thus of the at least one stop finger together with its displacement device, which with the at least one stopper N2008 / 31500 • · ft ·
    finger operatively connected, a simple and robust construction of the traversing device and the entire stop device ensured.
    It is advantageous if the monitoring device for detecting an obstacle comprises at least one sensor element arranged on the at least one stop finger, in particular a mechanically actuated contact switch or a non-contact proximity sensor. In this embodiment, an immediate release of the protective function is ensured at a contact of at least one stop finger with an obstacle, in which case only a very small counterforce on at least one stop finger occurs.
    It is particularly advantageous if the retraction device comprises at least one pneumatic muscle for the application of at least part of the force for the retraction movement. Due to the low mass of a pneumatic muscle and the resulting very large force-to-weight ratio, very high acceleration values of up to 50 m / s 2 can be achieved. At the same time a space-saving retraction device can be formed by the small dimensions of a pneumatic muscle.
    It is also advantageous if the at least one pneumatic muscle of the retraction device is equipped with a return spring. As a result of this embodiment, the parts of the machine tool moved by a return movement, in particular the at least one stop finger and its traversing device, are moved back into their original position in a passive manner before the retraction movement, when the pneumatic muscle has been deactivated. Of course, such a return spring can also be used in a different design retraction devices without a pneumatic muscle. It is also favorable if the retraction device for applying at least part of the force for the retraction movement comprises at least one pyrotechnic actuator, which is designed in particular only for a single use. Such pyrotechnically functioning retraction actuators have the advantage that very small reaction times can be achieved with them until the start of retraction of the stop finger, in particular of a few milliseconds. Furthermore, pyrotechnic actuators need no external power supply with energy N2008 / 31500
    or an active medium such as compressed air and are therefore very easy to use and controllable. It is advantageous if the monitoring device comprises a measuring device for the continuous measurement of a counterforce on the at least one stop finger, so that a presence of an obstacle by the monitoring device by comparing the measured counterforce with a predefined, the maximum allowable counterforce representing threshold value can be determined. These measures ensure that the protective function is executed only when the stop finger strikes a stationary obstacle and thus the number of false triggering of the protective function is minimized. Due to the pre-definable threshold, a flexible adaptation of the machine tool to different conditions and safety standards is possible. It is favorable in this context if the measuring device of the monitoring device comprises at least one force-measuring element on or in the at least one stop finger. This refinement ensures the accurate and reliable determination of the counterforce on the at least one stop finger in a simple manner. Finally, it is favorable if the measuring device of the monitoring device for detecting the pressure or pressure rise in at least one pneumatic muscle with at least one pressure sensor and optionally for additional detection of the distance covered or the position of the at least one stop finger with at least one displacement or position sensor Is provided.
    In such an embodiment, no sensor element for measuring force on or in at least one stop finger are needed. In addition, the opposing forces are monitored in this way on all parts of the machine tool moving from the pneumatic muscle to at least one stop finger. By evaluating the data of at least one displacement or position sensor which detects the distance traveled or the position of the at least one stop finger, the triggering of the protective function can be adapted even better. For example, it can be used to prevent the protective function from being performed when the stop finger is completely retracted.
    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 an oblique view of a bending machine with stop devices for workpieces.
    Figure 2 is a partially sectioned side view of a first embodiment of a stop device and a retraction device for a bending machine. and
    Fig. 3 is a partially sectioned side view of a second embodiment of a stop device and a retraction device for a bending machine.
    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 are to be transferred to the new situation mutatis mutandis when a change in position. All statements on ranges of values in the description of the present invention should be understood to include any and all sub-ranges thereof, e.g. the indication 1 to 10 should be understood to include all sub-ranges, starting from the lower limit 1 and the upper limit 10, i. all subregions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1 or 5.5 to 10. N2008 / 31500
    «<- *» ft «« iU · Μ I * »« »t · a« · &gt; · A «* * 1 · · ·
    In Fig. 1 is shown as an embodiment of a machine tool 1, a bending machine 2 or press brake for performing bending transformations on workpieces 3 in an oblique view.
    The bending machine 2 has a fixed table beam 4 and a relative thereto by drive means 5, for example in the form of hydraulic cylinders, movable in the vertical direction of the pressing bar 6. The pressing beam 6 is movably mounted on a frame 7 of the bending machine 2. Both the frame 7 and the table beam 4 of the bending machine 2 are fixedly arranged on a base member 8, which stands on a footprint 9, for example, a floor of a production hall.
    On an upper side of the table beam 4 and a lower side of the press beam 6 bending tools are fixed as here in the form of a bending die 10 and a bending punch 11. In the illustrated embodiment, two pairs of a respective Beigegenk 10 and a corresponding bending punch 11 are provided, it is quite possible to arrange more or less such pairs over a total length of the table beam 4 and the press beam 6 to approximately in subsequent operations different bending operations on To make workpiece 3.
    The region above a bending die 10 or between a bending die 10 and the bending punch 11 corresponding thereto represents a processing region 12 of the bending machine 2 for the workpiece 3. Thus, in particular an operator 13 can position the workpiece 3 as quickly and correctly as possible in the processing region 12 in a press room 14 of the bending machine 2, which press room 14 is located behind the table bar 4, at least one adjustable stop device 15, in the illustrated embodiment, two adjustable stop devices 15 in the form of back stops provided.
    The drive means 5 of the press beam 6 and the stop devices 15 are supplied by a control device 16 with energy and control signals. For operating the bending machine 2 by the operator 13, in particular an operating device 17 is provided, by means of which the operator 13 controls the bending machine 2 via the control device 16 and via which operating device the operator 13 provides status information about the bending machine 2 State or the operations in the bending machine 2 receives. In this context, it should also be noted that the assembly of the bending machine 2 with workpieces 3 can also be performed with a workpiece handling device, not shown, such as a articulated robot.
    Fig. 2 shows a partially sectioned side view of a first embodiment of a stop device 15 of the bending machine 2. The possible structure of the stop devices 15 in Fig. 1 can be followed in detail with reference to FIG.
    The stop device 15 comprises at least one stop finger 18, which has a stop surface 19 and optionally also a support surface 20 for the workpiece 3 at its front, the processing area 12 of the bending machine 2 facing end face. The stop finger 18 is connected via a guide track 21 movably connected to a finger carrier 22 of the stop device 15. Because of this movable connection of the stop finger 18 via a particular CNC-controlled traversing device 23 along a horizontal axis of movement or movement path 24 in the present embodiment before, in the direction of the processing area 12, and back, away from the processing area 12, movable.
    In order to move the at least one stop finger 18 relative to the finger carrier 22 along the movement path 24, the traversing device 23 is equipped with a drive means 25, in particular with a CNC-controlled servomotor. The drive means 25 is fixed or immovably connected to the finger carrier 22 and is operatively connected via a pinion 26 of the drive means 25 and a rack assembly 27 with the stop finger 18. The rack assembly 27 is fixedly arranged on the stop finger 18.
    The finger carrier 22 is, as shown in the present embodiment, further movably connected to a retraction slide 28 of a retraction device 29 of the bending machine 2. In this way, the finger carrier 22 is movable up and down along a vertical movement path 31 via a second drive means 30 fixedly connected to the finger carrier 22 along a movement path 31. Again, the operative connection between the second drive means 30 and the retraction slide 28 via a pinion 32 of the drive means 30 and a rack assembly 33 which is fixedly arranged on the retraction slide 28, made.
    For driving the first drive means 25, whereby the stopper finger 18 is moved in the horizontal direction, and the second drive means 30, whereby the finger carrier 22 and thus also the stop finger 18 are moved in the vertical direction, these drive means 25, 30 via electrical lines with a Motion and position control 34 of the controller 16 is connected.
    The retraction slide 28 of the retraction device 29 is in turn connected via a guide track 35 in the horizontal direction movable with a support device 36 of the bending machine 2 and the support device 36 is fixedly arranged on the table top 4. It is also possible to arrange the carrier device 36 fixed to the base element 8 of the bending machine 2. By means of a retraction actuator 37, which is connected on the one hand to the carrier device 36 and on the other hand to the retraction slide 28, the retracting carriage 28 and thus the finger carrier 22 along with the drive means 25 and the stop finger 18 along the horizontal path 24 of the table bar 4 abruptly after wegbewegbar back, causing the stop finger 18 and in particular its stop surface 19 and an end face 47 of the stop finger 18 along the movement path 24 away from the processing area 12 of the bending machine 2.
    The withdrawal actuator 37, which is designed in the present embodiment as a pneumatic cylinder, serves to move the stop finger 18 as quickly as possible away from the processing area 12 in the event of danger. If a dangerous situation is detected by a monitoring device 38 of the control device 16, then it opens a valve 39 of a compressed air tank 40 and the compressed air flowing abruptly via a line 41 into the cylinder of the retraction actuator 37 moves the retraction device 29 and thus the stop device 15 together with the stop finger 18 the movement path 24 from the processing area 12 and the table bar 4 away. The compressed air in the N2008 / 31500 - 14-
    Compressed air tank 40 is provided by means of a compressor 42, which is connected to the power supply and control with the control device 16 via an electrical line.
    Instead of the pneumatic cylinder as Rückzugsaktor 37 and a CNC-controlled drive means is conceivable, which is designed for a quick withdrawal in one direction. It is also possible that the withdrawal device 29 comprises a plurality of withdrawal actuators 37.
    The bending machine 2 in Fig. 1 shows two stop devices 15 in the form of back stops, the method for operating a machine tool 1 with a stop device 15, however, can be carried out with only one stop device 15 or with more than two stop devices 15. It is also possible to carry out the method with differently arranged stop devices 15, for example with a side stop. For a forming operation, a workpiece 3 is inserted between the bending die 10 and the bending punch 11 by an operator 13 from the front side of the bending machine 2, the workpiece 3 being struck by the operator 13 against the abutment surface 19 of the stop finger 18 of the stop device 15 and thereby the workpiece Workpiece 3 occupies a precisely defined position in the processing area 12 between the bending die 10 and the bending punch 11 of the bending machine 2. Previously, the at least one stop finger 18 of the stop device 15 is moved by means of the traversing device 23 along the movement path 24 into a provided stop position 43. In an after movement of the at least one stop finger 18 in the direction of the processing area 12 of the bending machine 2, it is possible, for example, by specifying a wrong target position for the stop finger 18 or by carelessness of the operator 13 that the stop finger 18 with an obstacle 44, such as the bending die 10, or that an obstacle 44, such as a finger 45 of the operator 13, is squeezed by the movement of the stopper finger 18, as exemplified in FIG. In order to avoid such a collision with an obstacle 44, the monitoring device 38 continuously checks whether such an obstacle 44 is located in the movement path 24 of the at least one stop finger 18. If a dangerous situation is detected or an obstacle 44 in the movement path 24 is detected by the monitoring device 38, a protective function is triggered by the monitoring device 38. By carrying out the protective function, a fast retraction or retraction of the at least one stop finger 18 and its traversing device 23 along the movement path 24 back, away from the processing area 12 causes. The force for this retraction movement is provided via the retraction device 29, which retraction device 29 is formed independently of the traversing device 23 and which retraction device 29 can perform the rapid retraction movement in exactly one direction.
    In principle, it is provided that a retraction device 29 moves back a stop device 15 in the event of danger. However, it is also possible that a retraction device 29 moves a plurality of stop devices 15 together. The force which can be applied by the retraction actuator 37 of the retraction device 29, although it must be increased in this case, it is in such a design, however, the cost of further retraction devices 29 saved.
    So that the monitoring device 38 of the bending machine 2 can detect an obstacle 44 in the movement path 24 of the at least one stop finger 18, the stop finger 18, as shown in the exemplary embodiment according to FIG. 2, is equipped, for example, with one or more sensor elements 46. In the present case, the sensor elements 46 are arranged in the region of the abutment surface 19 and the end face 47 of the abutment finger 18 and, in particular, are designed as mechanically operated contact switches or non-contact proximity sensors. If the stop finger 18 now encounters an obstacle 44 in a movement toward the processing area 12, the sensor elements 46 report this to the monitoring device 38 via an electrical connection, which may also be wireless, and this immediately triggers retraction of the at least one obstacle a stop finger 18 by means of the retraction device 29. N2008 / 31500 -16-
    Fig. 3 shows a partially sectioned side view of another embodiment of a stop device 15 for a bending machine 2, The withdrawal actuator 37 of the retraction device 29 is executed in this case as a pneumatic muscle 48. If compressed air is introduced via the line 41 into the pneumatic muscle 48 by opening the valve 39, the pneumatic muscle 48 shortens along its longitudinal direction and thus moves the retraction carriage 28 and the abutment device 15 connected therewith such that the abutment finger 18 moves along the movement path 24 moves away from the processing area 12.
    In the embodiment in Fig. 3, the pneumatic muscle 48 is equipped with a return spring 49. After the deactivation of the pneumatic muscle 48 and the escape of compressed air from the pneumatic muscle 48, the return spring 49 moves in a passive manner, the retraction device 29 and thus the stopper 15 back to their original positions.
    In the embodiment according to FIG. 3, a presence of an obstacle 44 is detected by the monitoring device 38 by continuously measuring or determining the counterforce on the at least one stop finger 18. If the measured opposing force exceeds a predefined threshold value representing the maximum permissible opposing force, the monitoring device 38 triggers the protective function and thus the retraction or retraction of the stop device 15. For the measurement of the counterforce, the monitoring device 38 is equipped with a measuring device 50.
    To measure the opposing force, the measuring device 50 in the embodiment shown comprises a plurality of force measuring elements 51 in the region of the stop surface 19 and the end face 47 of the at least one stop finger 18. An electrical connection, which may also be performed wirelessly, the force measuring elements 51 indicate the value of the current counterforce the stop finger 18 to the measuring device 50 in the monitoring device 38 of the control device 16,
    Furthermore, the measuring device 50 detects the counterforce on the stop finger 18 by evaluating the actual value of an adjusting force in a force control circuit 52 of the N2008 / 31500 - 17 -
    Movement and position control 34 of the control device 16, which movement and position control 34 is a part of the traversing device 23 of the stop device 15. The traversing device 23 moves the at least one stop finger 18 with the aid of the force control loop 52.
    In addition, the measuring device 50 comprises at least one pressure sensor 53, which is located in the interior of the pneumatic muscle 48. By means of the at least one pressure sensor 53, the measuring device 50 detects the pressure or the pressure rise in the interior of the pneumatic muscle 48. From the obtained data, the monitoring device 38 can calculate the current counterforce which acts on the at least one stop finger 18. In addition, the measuring device 50 detects the distance traveled or the position of the at least one stop finger 18 with a displacement or position sensor 54, which is arranged in the form of a rotary encoder on the drive means 25 of the stop finger 18. With the aid of the position sensor 54, it is possible to make the determination of the actual counterforce on the stop finger 18 via the measuring device 50 and the reaction processes derived therefrom by the monitoring device 38 dependent on the current position of the stop finger 18.
    It is possible to determine the actual drag on the at least one stop finger 18 by one or more of the above-described modes. In a determination in several ways, the resulting actual counterforce is to be calculated by a suitable method, such as a mean calculation from the individual force values.
    In the embodiments of the retraction device 29 and the stop device 15 shown in FIGS. 2 and 3, the drive means 30 for height adjustment of the stop device 15 between the traversing device 23 of the stop finger 18 and the retraction device 29 is arranged. According to an alternative, not shown embodiment, it is also possible that the retraction device 29 is arranged immediately adjacent to the traversing device 23. In such a case, in particular, the retraction actuator 37 of the retraction device 29 can be dimensioned smaller, since the retraction device 29 no longer has to move the drive means 30 and the other components of the height adjustment device of the stop device 15 when driving off.
    For the sake of order, it should finally be pointed out that, for a better understanding of the structure of the bending machine, these or their components have been shown in part to be unfashionable and / or enlarged and / or reduced in size.
    The embodiments show possible embodiments of the bending machine or machine tool, 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 variation possibility due to the teaching of the technical Acting by objective invention in the skill of those working in this technical field is the expert. So are all conceivable variants, which are possible by combinations of individual details of the illustrated and described embodiment variant of the scope of protection. 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 in Figs. 1; 2; 3 embodiments 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. N2008 / 31500 4 49
    position
    Reference numeral 1 Machine tool 2 Bending machine 3 Workpiece 4 Table beams 5 Drive means 6 Press beam 7 Frame 8 Base element 9 Contact surface 10 Bending die 11 Bending punch 12 Processing area 13 Operator 14 Press room 15 Stopper 16 Control device 17 Bed device 18 Stop finger 19 Stop face 20 Support face 21 Guideway 22 Finger carrier 23 Movement device 24 Trajectory 25 drive means 26 pinion 27 rack assembly 28 retracting slide 29 retraction device 30 drive means 31 trajectory 32 pinion 33 rack assembly 34 Motion and position control 35 guideway
    Carrier Retraction Actuator Monitoring Device
    Valve
    Air receiver
    management
    compressor
    stop position
    obstacle
    finger
    sensor element
    face
    Pneumatic muscle return spring
    measuring device
    Force measuring element
    Power control loop
    pressure sensor
    Position sensor N2Q08 / 31500
    权利要求:
    Claims (18)
    [1]


    1. A method for operating a machine tool (1) with a stop device (15) for positioning a workpiece (3) in a machining area (12), in which method at least one stop finger (18) of the stop device (15) by means of a traversing device (23) is moved along a movement path (24) in a stop position (43) in the direction of the processing area (12), and wherein it is continuously checked by means of a monitoring device (38) whether an obstacle (44) in the movement path (24 ) of the at least one stop finger (18) and wherein the monitoring device (38) a protective function is triggered when such an obstacle (44) is detected, characterized in that the execution of the protective function, a fast retracting or retracting at least one Stop finger (18) and its traversing device (23) along the movement path (24) back from the Bearbeitungsbereic h (12) and the force for the retraction movement is provided by a retraction device (29) which is independent of the traversing device (23) and can perform the rapid retraction movement in exactly one direction.
    [2]
    2. The method according to claim 1, characterized in that the at least one stop finger (18) of the traversing device (23) before in the direction of the processing area (12) at normal travel speed, in particular more than 2 m / min, is moved.
    [3]
    3. The method according to claim 1 or 2, characterized in that in the fast retraction or retraction of the at least one stop finger (18) and its traversing device (23) within a human reaction time in reflex movements corresponding period of time, preferably within 100 ms, in particular Within 75 ms, the at least one stop finger (18) and its traversing device (23) at least 5 mm, preferably at least 10 mm, in particular at least 25 mm away from the processing area (12) is moved away N2008 / 31500-2.
    [4]
    4. The method according to any one of the preceding claims, characterized in that the force for the withdrawal movement by means of at least one pneumatic muscle (48) which is optionally equipped with a return spring (49) is provided.
    [5]
    5. The method according to any one of the preceding claims, characterized in that a presence of an obstacle (44) of the monitoring device (38) by continuously measuring a counter force on the at least one stop finger (18) and by comparing the measured reaction force with a predefined maximum permissible counterforce representing threshold value is detected.
    [6]
    6. The method according to claim 5, characterized in that the counterforce with at least one force measuring element (51) on or in at least one stop finger (18) is detected and / or that the opposing force by evaluating the actual value of an adjusting force in a force control loop (52) Traversing device (23) is detected, which traversing device (23) moves the at least one stop finger (18) by means of the force control circuit (52).
    [7]
    7. The method according to claim 4 and 5, characterized in that the counterforce by detecting the pressure or pressure increase in at least one pneumatic muscle (48) with at least one pressure sensor (53) and optionally by additionally detecting the distance traveled or the position of the at least one abutment finger (18) having at least one displacement or position sensor (54) and by calculating the opposing force from these detected data is determined. N2008 / 31500


    [8]
    8. The method according to any one of claims 5 to 7, characterized in that the threshold value which the counterforce must at least reach, so that the protective function is triggered, is set to a value of 150 N.
    [9]
    9. The method according to any one of claims 5 to 8, characterized in that the protective function is triggered before reaching the threshold.
    [10]
    10. The method according to claim 9, characterized in that the protective function is triggered upon the occurrence of a counterforce of at least 90% of the threshold value, in particular of at least 95% of the threshold value.
    [11]
    11. Machine tool (1) with a stop device (15) for positioning a workpiece (3) in a processing area (12), which stop device (15) at least one stop finger (18), which is arranged movably on a finger carrier (22) and is movable back and forth along a movement path (24) by means of a drive means (25) of a displacement device (23), wherein the drive means (25) is fixedly connected to the finger carrier (22), and which machine tool (1) is a monitoring device (25). 38), with which during a movement of the at least one stop finger (18) along the movement path (24) can be continuously checked before in the direction of the processing area (12) in a stop position (43), whether an obstacle (44) in the Movement path (24) of the at least one stop finger (18) and wherein the monitoring device (38) a protective function is triggered when such an obstacle (44 ) in the movement path (24), characterized in that a withdrawal actuator (37) of a retraction device (29) directly or indirectly with the along the movement path (24) movable finger carrier (22) is operatively connected, so that as a protective function a fast retracting or Retracting the at least one stop finger (18) and its traversing device (23) back along the movement path (24), away from the processing area (12) by the retraction actuator (37) the finger carrier (22) and thus the at least one N2008 / 31500 impact finger (18) and its traversing device (23) moves away from the processing area (12), wherein the retraction actuator (37) the fast retraction movement is executable only in this direction.
    [12]
    12. Machine tool (1) according to claim 11, characterized in that the monitoring device (38) for detecting an obstacle (44) at least one arranged on at least one stop finger (18) sensor element (46), in particular a mechanically actuated contact switch or non-contact Proximity sensor includes.
    [13]
    13. Machine tool (1) according to claim 11 or 12, characterized in that the retraction device (29) for applying at least a part of the force for the retracting movement comprises at least one pneumatic muscle (48).
    [14]
    14. Machine tool (1) according to claim 13, characterized in that the at least one pneumatic muscle (48) is equipped with a return spring (49).
    [15]
    15. Machine tool (1) according to any one of claims 11 to 14, characterized in that the retraction device (29) for applying at least part of the force for the retraction movement comprises at least one pyrotechnic actuator, which is designed in particular only for a single use.
    [16]
    16. Machine tool (1) according to one of claims 11 to 15, characterized in that the monitoring device (38) comprises a measuring device (50) for continuously measuring a counterforce on the at least one stop finger (18), so that a presence of an obstacle (44 ) of the monitoring device (38) by comparing the measured counterforce with a predefined, the maximum allowable counterforce representing threshold value can be determined. N2008 / 31500
    [17]
    17. Machine tool (1) according to claim 16, characterized in that the measuring device (50) comprises at least one force-measuring element (51) on or in at least one stop finger (18).
    [18]
    18. Machine tool (1) according to claim 13 or 14 and claim 16, characterized in that the measuring device (50) for detecting the pressure or pressure increase in at least one pneumatic muscle (48) with at least one pressure sensor (53) and optionally for additional detection the distance covered or the position of the at least one stop finger (18) is equipped with at least one displacement or position sensor (54). TRUMPF Maschinen Austria GmbH &amp; Co. KG. by

    Lawyer GmbH N2008 / 31500
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    EP2586544A1|2013-05-01|
    EP2586544B1|2014-06-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE3745067C2|1986-06-20|1997-03-20|Amada Co|Multi-step bending machine e.g. press brake|
    JPS63273520A|1987-04-30|1988-11-10|Amada Co Ltd|Control method for back gage in press brake|
    JPH0342133A|1989-07-10|1991-02-22|Amada Co Ltd|Controller for positioning stopper|
    JPH04274823A|1991-03-01|1992-09-30|Amada Co Ltd|Bending device with back gage|
    JP2007069243A|2005-09-07|2007-03-22|Amada Co Ltd|Press brake|
    JP3504325B2|1994-04-07|2004-03-08|株式会社アマダ|Method and apparatus for controlling butting gauge of bending machine|
    AT503790B1|2006-07-25|2008-01-15|Trumpf Maschinen Austria Gmbh|STOPPING DEVICE FOR A BEND PRESS|AT518639B1|2016-07-26|2017-12-15|Trumpf Maschinen Austria Gmbh & Co Kg|Workpiece processing machine and method for operating the workpiece processing machine|
    AT519203B1|2016-10-14|2018-10-15|Trumpf Maschinen Austria Gmbh & Co Kg|Backgauge for a bending machine|
    法律状态:
    优先权:
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    AT15582011A|AT511451B1|2011-10-25|2011-10-25|TOOLING MACHINE WITH A BRAZING DEVICE AND METHOD OF OPERATING THE MACHINE TOOL|AT15582011A| AT511451B1|2011-10-25|2011-10-25|TOOLING MACHINE WITH A BRAZING DEVICE AND METHOD OF OPERATING THE MACHINE TOOL|
    EP20120189750| EP2586544B1|2011-10-25|2012-10-24|Machine tool with a limit stop device and method for operating the machine tool|
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