EP3580000A1 - Procédé et dispositif d'actionnement d'un appareil de serrage expansible hydraulique - Google Patents

Procédé et dispositif d'actionnement d'un appareil de serrage expansible hydraulique

Info

Publication number
EP3580000A1
EP3580000A1 EP18705851.6A EP18705851A EP3580000A1 EP 3580000 A1 EP3580000 A1 EP 3580000A1 EP 18705851 A EP18705851 A EP 18705851A EP 3580000 A1 EP3580000 A1 EP 3580000A1
Authority
EP
European Patent Office
Prior art keywords
clamping screw
hydraulic medium
hydraulic
clamping
measured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18705851.6A
Other languages
German (de)
English (en)
Inventor
Thomas Retzbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schunk GmbH and Co KG
Original Assignee
Schunk GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schunk GmbH and Co KG filed Critical Schunk GmbH and Co KG
Publication of EP3580000A1 publication Critical patent/EP3580000A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/30—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck
    • B23B31/305—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck the gripping means is a deformable sleeve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/30—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck
    • B23B31/302—Hydraulic equipment, e.g. pistons, valves, rotary joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/002—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring the holding action of work or tool holders
    • B23Q17/005—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring the holding action of work or tool holders by measuring a force, a pressure or a deformation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/078—Hand tools used to operate chucks or to assemble, adjust or disassemble tools or equipment used for turning, boring or drilling

Definitions

  • the present invention relates to a method for actuating a hydraulic expansion chuck, in particular a hydraulic expansion chuck or hydro-expansion mandrel, comprising a main body assembly in which a filled with a hydraulic medium pressure chamber system is formed, which has a pressure chamber with a wall on one of the pressure chamber side facing away from a clamping surface defined, and introduced from the outside into the main body assembly and connected via connecting channels with the pressure chamber threaded bore, wherein in the threaded bore a clamping screw is screwed, which is axially adjusted by screwing into the threaded bore such that the hydraulic medium in the direction pressed the pressure chamber and the wall is elastically deformed to clamp a tool or workpiece, wherein in the method, the clamping screw rotated by means of a rotary tool and the torque applied to the hydraulic expansion device, in particular by Fix ieren the hydraulic expansion chuck is supported in a stationary support. Furthermore, the invention relates to a device for actuating a hydraulic Dehnspann insightful.
  • Hydro-Dehnspann nails are clamping devices that can be used for both the tool and the workpiece clamping, which is basically a distinction between two different types, namely a hydraulic expansion chuck and a hydraulic expansion mandrel.
  • the basic mode of operation of both types of construction is identical, namely that by actuating the hydraulic expansion device, a hydraulic medium, in particular a hydraulic grol, is pressed within a pressure chamber system of a base body assembly of the hydraulic expansion device in the direction of a pressure chamber of the pressure chamber system and thereby causes an elastic expansion of a clamping surface defining a wall of the pressure chamber.
  • Actuation of hydraulic expansion jigs can be done in different ways.
  • an operation by means of a clamping cylinder and a pressure or pull rod is possible.
  • a direct application by means of a hydraulic unit can take place.
  • hydraulic expansion chucks can be actuated by turning a tightening screw by means of a turning tool.
  • the present invention relates.
  • the aforementioned basic body arrangement of the hydro-expansion chuck comprises a base body, which at its back The lower end region has a machine interface, via which the hydraulic expansion chuck can be fixed to a corresponding tool holder receptacle on a machine tool.
  • a clamping region is formed with a central tool receptacle which is open towards the front end face of the main body and into which a tool shank to be clamped can be inserted.
  • the base body assembly also includes an expansion sleeve which is inserted into the base body to form a pressure chamber surrounding the expansion sleeve and acted upon by a hydraulic medium and which forms the tool holder open towards the front end surface of the base body.
  • hydraulic expansion equipment When used in the industry, hydraulic expansion equipment is subject to wear and tear, so regular checking of the condition and performance of the hydraulic expansion equipment is important to ensure process reliability and avoid production downtime due to unintentional release of tools or workpieces. By a clamping force measurement, the remaining performance and wear can be determined.
  • a measuring mandrel or clamping force tester is such that it can not be used to determine the quality of a clamping of a tool or workpiece with a hydraulic expansion-clamping device during its operation, but the measurement must be carried out in a separate step. This is awkward and time consuming.
  • the object of the present invention is to specify a method and a device for actuating a hydraulic expansion-tensioning device of the type mentioned above, in which a current tensioning state of the hydraulic expansion-tensioning device can be determined during the twisting of a tensioning screw.
  • a corresponding device for actuating a hydraulic Dehnspann might be specified.
  • the invention is thus based on the consideration of determining a clamping state of the hydraulic expansion chuck device by indirectly determining the current clamping force values of the hydraulic expansion chuck device via a measurement of hydraulic expansion devices. Likmediumdruck- lndikationshong during a rotation of the clamping screw, so during the clamping of the hydraulic expansion chuck, measured and evaluated the measured values are evaluated. A corresponding evaluation of the detected measured values allows a conclusion on the performance and / or the wear and / or possible malfunction of the hydraulic expansion chuck and thus the derivation of a current clamping state of the hydraulic expansion chuck.
  • the determined in this way clamping state of the existing of the hydraulic Dehnspannewed and a tensioned tool or workpiece total system is communicated to the user immediately, comfortably and easily understandable. For example, the user is signaled when a minimum clamping force or a set clamping force of the hydraulic expansion chuck has been reached without the user having to intervene in the overall system from the outside and have to make inquiries of himself.
  • the turning tool is automatically aligned relative to the hydro-Dehnspann adopted and automatically brought into engagement with the clamping screw. As a result, a consistent quality of intervention can be ensured.
  • the clamping screw can be automatically rotated by means of a screwing, in particular an electric screwing device on which the rotary tool is held.
  • a screwing in particular an electric screwing device on which the rotary tool is held.
  • the electric screwdriver is an electric screwdriver and the rotary tool is a hexagon bit which is rotatably supported on the cordless screwdriver.
  • Electric screwing devices have the particular advantage that with them a constant screwing speed of the clamping screw can be achieved.
  • the clamping screw can be manually rotated by means of the turning tool, in particular a screwdriver.
  • values of the pressure of the hydraulic medium as hydraulic medium pressure indication values in the pressure chamber system and / or on the tensioning screw can be measured via a pressure transducer during a screwing-in of the tensioning screw.
  • values of the pressure of the hydraulic medium can be measured as hydraulic medium pressure indication values on the tensioning piston instead of on the tensioning screw via a pressure transducer.
  • values of a variable complementary to the pressure of the hydraulic medium can be measured as hydraulic medium pressure indication values in step a) during a screwing in of the tensioning screw.
  • the pressure of the hydraulic medium is not measured directly, but indirectly over another size. There is no need to change be performed on the pressure chamber system, such as an installation of pressure transducers.
  • a deformation, in particular an expansion and / or an elongation, of the basic body arrangement can be measured as a variable complementary to the pressure of the hydraulic medium as hydraulic medium pressure indication values with the aid of a strain gauge.
  • a strain gauge can be attached without great effort, for example, on an outer surface of the main body assembly.
  • the torque on the tensioning screw is preferably measured as a variable complementary to the pressure of the hydraulic medium as hydraulic medium pressure indication values.
  • the measurement of the torque on the clamping screw via a measurement of the torsion of a torsion by means of a mounted on the torsion strain gauge can be done. If the tightening screw is rotated by means of an electric screwing device, on which the turning tool is held, the measurement of the torque on the tightening screw can also take place via a measurement of the motor current of a motor of the electric screwing device at a constant engine speed.
  • the measuring distance between two directly successively measured hydraulic medium pressure indication values preferably corresponds to the measuring distance between two directly successive measured Spannschraubeweg indicative values, in particular a predetermined path step, angle step or time step at a constant insertion speed of the clamping screw.
  • the trigger event can be a contact of the clamping surface with a tool or workpiece to be clamped and / or a stop of the clamping screw on a limiting the axial displacement of the clamping screw stop and / or the trigger value can be a for the used Hydro-Dehnspann Rhein in a certain trigger event be characteristic value of the pressure of the hydraulic medium or a complementary size.
  • the trigger value may also be a threshold value of the pressure of the hydraulic medium or a complementary quantity which is preferably between 20% (in a hard screwing) and 80% (in a soft screwing) of a value of the pressure or a variable complementary thereto, in which a tightening of the clamping screw is terminated, that is, for example, a Abschaltcardmomentagonistswert when reaching the stop by the clamping screw.
  • the measured tension screw path indicative values may be used to ascertain whether a tension state determined based on the measured hydraulic fluid pressure indication values is correct. Values of the axial travel position of the tightening screw within the threaded hole can be measured as tightening screw path indication values. In this case, the Spannschraubenweg is measured directly. Thus, a possible conversion of Spannschraubenweg-Indikations archive in Spannschraubenwege deleted.
  • values of a variable complementary to an axial path position of the tightening screw within the threaded bore can be measured as tightening screw path indication values.
  • the tightening screw travel is measured indirectly by measuring another variable.
  • the angle of rotation of the clamping screw as a complementary to the axial path position of the clamping screw within the threaded bore size as Spannschraubenweg indicative values, preferably by means of an encoder and / or Hall sensors, either directly on the clamping screw or on the rotary tool or on a screw device, at which the rotary tool is held, measured.
  • an electric screw device with an electric motor Hall sensors can be used to determine a rotor position of the motor.
  • BLDC brushless DC motors
  • a measurement of the angle of rotation via an encoder or Hall sensors on the clamping screw is particularly elegant because it does not require any modifications to the exciting hydraulic expansion device.
  • Such a rotational angle measurement therefore contributes to the fact that clamping states can be determined for a wide variety of hydraulic expansion chucks during their actuation.
  • the distance covered by the clamping screw and, if appropriate, the tensioning piston can then be calculated.
  • step b) In order to determine a clamping state of the hydraulic expansion clamping device in step b) by evaluating the measured hydraulic medium pressure indication values, the following partial steps are advantageously carried out in step b):
  • the characteristic hydraulic pressure indicative value is preferably a characteristic hydraulic pressure indicative value for a contact of the clamping surface with a tool or workpiece to be clamped and the associated clamping state the contact between the clamping surface and the tool or workpiece and / or the characteristic hydraulic medium indication value is a characteristic hydraulic medium pressure -Indikationswert at a stop of the clamping screw on a limiting the axial displacement of the clamping screw stop and the associated clamping state reaching a predefined set clamping force of the hydraulic expansion device used.
  • the predefined set clamping force should be achieved with an intact hydro-Dehnspann worn to slight deviations, for example, due to manufacturing tolerances of the tensioned tool or workpiece. With increasing number of actuation of the hydraulic expansion device, however, their wear and thus the maximum clamping force to be achieved increases, so that the predetermined nominal clamping force will no longer be reached at some point.
  • the following partial steps can be carried out in step b) in order to determine a clamping state of the hydraulic expansion clamping device by evaluating the measured hydraulic medium pressure indication values:
  • step b3) calculating slopes of the hydraulic medium pressure indication values measured in step a) at predetermined, uniform measuring distances during screwing in of the tensioning screw, wherein a gradient consists of a difference between two respectively successively measured hydraulic medium pressure indication values or their amount as dividend and the measuring distance between the two considered hydraulic medium pressure indication values is formed as a divisor,
  • a calculation of slopes and consideration of slope changes offers, in contrast to a mere consideration of absolute values, the advantage that characteristic pressure jumps can be detected for the hydraulic expansion chuck used.
  • the hydraulic medium pressure indication values measured in step a) can be compared to a scale can be plotted with multiples of the measuring distance between two directly successively measured hydraulic medium pressure indication values and the resulting measured value curve can be smoothed in particular by calculating moving average values and / or at least one particular linear curve fitting can be performed on the measured value curve. As a result, significant changes in slope can be detected.
  • step b4) a change in slope between two slopes is determined, which were calculated in step b3) from three directly successively measured hydraulic medium pressure indication values. Since the two gradients used for the calculation of the change in slope follow one another directly in terms of messchronology, it can be clearly concluded in the case of a marked change in slope that this occurred in the middle of the three measured values considered.
  • the slope change may be determined in step b4) by subtracting from one another or dividing by two slopes calculated in step b3). If two calculated slopes are divided to determine a slope change, the predefined area considered in the test in step b5) may be a predefined minimum multiple of one slope. A significant slope change is detected when a higher slope is a multiple of a lower slope of the two slopes considered and the corresponding multiple is greater than the predefined minimum multiple.
  • step b5) If, during the test in step b5), no clear change in pitch is detected until a stop limiting the axial adjustment of the clamping screw, it can be concluded that there is no tool or workpiece to be clamped or a tool with too small a shank or a workpiece with one suitable clamping diameter knife is used. If, however, a clear change in slope is detected, its cause can be determined in step b6) by using further measurement and / or setpoint values. As will be explained in more detail below, it is possible to use, for example, tension screw path indication values, setpoint values for tension screw path indication values and / or setpoint values for hydraulic medium pressure indication values. However, the cause of a significant change in slope can also be determined without taking further measurement and / or setpoint values.
  • tension screw path indication values can be measured at predetermined, uniform measuring distances, the measuring distance between two directly successively measured hydraulic medium pressure indication values being the measuring distance between two directly consecutive measured clamping screw path indication values.
  • the cause for the presence of a significant change in slope is preferably preferred. is true by comparing a measured during the significant change in pitch Spannschraubenweg indicative value with at least one known, characteristic of the hydraulic Dehnspann engagedstyp setpoint for the Spannschraubenweg indication value.
  • the comparison of the Spannschraubeweg indication values thus represents a hedge, so that in fact the right cause for a detected significant change in slope is determined.
  • the setpoint value for the tightening screw path indication value can be a tightening screw path indication value for a contact of the clamping surface with a tool to be clamped or workpiece and / or for a stop of the tightening screw on a stop limiting the axial displacement of the tightening screw.
  • the torque on the clamping screw is advantageously measured as the hydraulic medium pressure indicative value as already explained above, and a malfunction of the hydraulic expansion chuck is determined in step b6) as the cause of the presence of a marked change in pitch From a comparison of a measured in the significant change in inclination bschraubeweg indication value with a setpoint for Spannschraubenweg indicative value shows that the measured Spannschraubenweg indicative value is outside of a range around the setpoint and thus significantly smaller than the setpoint.
  • the malfunction of the hydro-expansion chuck can be determined as a seizure of the clamping screw in the threaded hole.
  • a seizure of the clamping screw can result from the fact that the external thread of the clamping screw does not meet the required surface requirements or the clamping screw no longer has sufficient lubrication.
  • the last-mentioned constellation as a cause for the presence of a significant change in slope instead of a malfunction of the hydraulic expansion device and a tool with a too large Shaft diameter or a workpiece with a too small hole can be determined. For example, if there is a tool with a large shaft diameter in a hydraulic expansion chuck, the shaft contacts the clamping surface sooner than expected and a clear change in pitch occurs already after a shorter tightening screw path.
  • the cause for the presence of a significant change in slope can be determined in step b6) by a hydraulic medium pressure indication value measured with the significant change in slope having at least one previously known, for the hydraulic-Dehnspann Rheinstyp characteristic setpoint for the hydraulic medium pressure indication value is compared.
  • the setpoint value for the hydraulic medium pressure indication value is preferably a hydraulic medium pressure indication value for a contact of the clamping surface with a tool or workpiece to be clamped and / or for a stop of the clamping screw on a stop limiting the axial adjustment of the clamping screw.
  • step b6) of the method according to the invention a contact of the clamping surface with a tool or workpiece to be clamped is taken as the cause for the presence of a significant change in inclination and, in step b7), the attainment of a minimum clamping force as clamping state is determined based on the specific cause.
  • the process according to the invention may preferably have the following further steps: Closing on a stop of the clamping screw on a stop limiting the axial adjustment of the clamping screw as a cause for the presence of a marked change in the pitch in step b6),
  • a tightening of the clamping screw by means of the rotary tool can be terminated if it is determined in step b) when evaluating the measured hydraulic medium pressure indication values that a predetermined switch-off condition is met.
  • the screwing of the clamping screw can be terminated in an electrical screwing by switching off the electric screwing.
  • a mechanical shut-off is conceivable.
  • the predetermined switch-off condition may be a previously known hydraulic medium characteristic of the hydraulic expansion-tensioner type used. pressure-lndikationswert be at a stop of the clamping screw on a limiting the axial displacement of the clamping screw stop, for example, a defined maximum torque for the hydraulic Dehnspann nails, which must be achieved within a predefined range.
  • screwing in can be ended, for example, if an upper threshold value for a torque difference of 500 mNm, for example, or if a corresponding torque gradient value of, for example, 15000 mNm / ° is exceeded. Timely termination of the operation prevents damage to the hydraulic expansion jig.
  • the clamping state determined in step c) is signaled to the user by being displayed via an optical signal, an acoustic signal or a vibration signal.
  • a device for actuating a hydraulic Dehnspann in particular a hydraulic expansion chuck or hydraulic Dehnspanndorns, with a base assembly in which a filled with a hydraulic medium pressure chamber system is formed, the pressure chamber having a wall, the on a side facing away from the pressure chamber defining a clamping surface, and introduced from the outside into the main body assembly and connected via connecting channels with the pressure chamber threaded surrounds, wherein in the threaded bore a clamping screw is screwed, which is axially adjusted by screwing into the threaded bore in that the hydraulic medium is pressed in the direction of the pressure chamber and the wall is elastically deformed in order to tension a tool or workpiece.
  • the device according to the invention has: a holding device, in particular stationary holder, which is designed to support a torque applied to the hydraulic expansion device when the clamping screw is rotated,
  • a measuring device which is designed to measure hydraulic medium pressure indication values at predetermined, uniform measuring distances and / or continuously during the rotation of the clamping screw,
  • an evaluation and control device which is designed to evaluate hydraulic medium pressure indication values measured by the measuring device and to determine a clamping state of the hydraulic expansion device
  • a signaling device which is designed to signal the determined by the evaluation and control unit clamping state of the hydraulic expansion device to a user.
  • the holding device may be a vise or gripper. But it can also be a support arm or a HSK, or steep taper tensioner with collet set, which is adapted to fix the hydraulic expansion chuck.
  • the holding device may have support surfaces corresponding to support surfaces on the hydraulic expansion device.
  • the device according to the invention preferably has a rotary tool which is designed to rotate the clamping screw.
  • the turning tool can be, for example, a bit, in particular a hexagon bit, or a wrench, in particular a hexagon wrench.
  • the device according to the invention has a screw device, in particular an electric screw device, on which the rotary tool is held in order to automatically turn the clamping screw.
  • the apparatus according to the invention may comprise an adjusting device with a holder for the rotary tool or a screwing device on which the rotary tool is held, to automatically align the rotary tool relative to the hydraulic expansion chuck and automatically engage with the clamping screw.
  • the adjustment device can have a 1-, 2-, 3-, or 5-axis kinematics and, in particular, be an industrial robot, such as an articulated robot, or a combination of linear modules and axes of rotation.
  • the measuring device preferably comprises a pressure sensor, which is designed to measure the pressure of the hydraulic medium as hydraulic medium pressure indication values in the pressure chamber system and / or on the tensioning screw during a screwing in of the tensioning screw.
  • a pressure sensor which is designed to measure the pressure of the hydraulic medium as hydraulic medium pressure indication values in the pressure chamber system and / or on the tensioning screw during a screwing in of the tensioning screw.
  • some hydraulic Dehnspann articulated adjacent to the threaded bore of the pressure chamber system in the axial direction of a cylinder bore of the pressure chamber system in which a clamping piston is contacted the clamping screw or connected thereto, so that an axial adjustment of the clamping screw when screwed into the threaded bore causes an axial adjustment of the clamping piston.
  • the pressure transducer may be designed to measure the pressure of the hydraulic medium instead of the clamping screw on the clamping piston.
  • the measuring device is designed to measure values of a variable complementary to the pressure of the hydraulic medium as a hydraulic medium pressure indication value during a screwing-in of the clamping screw.
  • the measuring device to a strain gauge the basic body arrangement, which is designed to measure a deformation, in particular an expansion and / or an elongation, of the basic body arrangement as a variable complementary to the pressure of the hydraulic medium, as hydraulic medium pressure indication values.
  • the measuring device can be designed to measure the torque as a variable complementary to the pressure of the hydraulic medium as hydraulic medium pressure indication values during a rotation of the clamping screw.
  • the measuring device may comprise a mounted on a torsion strain gauges, which is adapted to measure the torsion of the torsion, so that from the torque on the clamping screw and, in turn, the pressure of the hydraulic medium can be calculated.
  • the device according to the invention comprises an electric screwing device with a motor on which the rotary tool is held
  • the measuring device may also comprise an ammeter which is adapted to measure the motor current of the electric screwing device at a constant motor speed, thus the torque on the clamping screw and from which in turn the pressure of the hydraulic medium can be calculated.
  • the measuring device is designed to measure clamping screw path indication values, in particular beginning with the occurrence of a predetermined trigger event or by measuring a predetermined trigger value at predetermined, uniform measuring distances and / or continuously during a screwing in of the clamping screw.
  • the measuring distance between two directly successively measured hydraulic medium pressure indication values in particular corresponds to the measuring distance between two instantly measured clamping screw path indication values.
  • the trigger event may be a contact of the clamping surface with a tool or work to be clamped.
  • the measuring device may be designed to measure values of the axial path position of the clamping screw within the threaded bore and / or values of a variable complementary to the axial path position of the clamping screw as clamping screw path indication values.
  • the measuring device is adapted to the rotation angle of the clamping screw as a complementary to the axial path position of the clamping screw within the threaded bore size as Spannschraubenweg indicative values either directly on the clamping screw or on the rotary tool or on a screwing device on which the rotary tool is held measure up.
  • the measuring device may have an encoder and / or Hall sensors to measure the angle of rotation of the clamping screw.
  • the evaluation and control device can be designed to calculate the distance traveled by the clamping screw using a measured angle of rotation and a known pitch of the thread of the clamping screw.
  • the evaluation and control device is designed to check whether a hydraulic medium pressure indication value measured during insertion of the tensioning screw lies within a predefined range around a hydraulic medium pressure indication value characteristic of the hydraulic expansion chuck type used, and to a characteristic hydraulic pressure indicative value associated clamping state of the hydro-Dehnspann worn to close when the Exam is positive.
  • the characteristic hydraulic medium pressure indication value may be a characteristic hydraulic medium pressure indication value for a contact of the clamping surface with a tool or workpiece to be clamped and the associated clamping state the contact between the clamping surface and the tool or workpiece and / or the characteristic hydraulic medium indication value a characteristic hydraulic medium pressure -Indikationswert in a stop of the clamping screw on a limiting the axial displacement of the clamping screw stop and the associated clamping state to achieve a predefined set clamping force of the hydraulic expansion device used.
  • the evaluation and control device can also be designed to:
  • the evaluation and control device is designed to apply the hydraulic medium pressure indication values measured by the measuring device against a scale with multiples of the measuring distance between two directly measured hydraulic medium pressure indication values before calculating the slopes, and the resulting measured value curve in particular by calculating moving average values Smooth and / or perform at least one particular linear curve fitting on the measured value curve.
  • the evaluation and control device is designed to determine a change in slope between two gradients, which were calculated from three directly successively measured hydraulic medium pressure indication values.
  • the evaluation and control device may be configured to determine the slope change by subtracting from one another or dividing by two calculated slopes.
  • the measuring screw can measure clamping screw path indication values at predetermined uniform measuring distances in addition to the hydraulic medium pressure indication values, the measuring distance between two directly successively measured hydraulic medium pressure indication values being the measuring distance between two directly successively measured Spannschraubenweg indication values.
  • the evaluation and control device is preferably designed to determine the cause of the presence of a significant change in the pitch by comparing a tension screw gauge measured during the significant change in pitch. to be determined with at least one known, characteristic of the hydraulic Dehnspann Rheinstyp setpoint for the Spannschraubenweg indication value.
  • the desired value for the Spannschraubenweg-Indikations wert a Spannschraubenweg indicative value at a contact of the clamping surface with a tool or workpiece to be clamped and / or a stop of the clamping screw on a the axial displacement of the clamping screw limiting stop.
  • the measuring device is designed to measure when screwing the clamping screw, the torque on the clamping screw as complementary to the pressure of the hydraulic medium size as hydraulic medium pressure indication value
  • the evaluation and control device is adapted to a measured in the significant change in pitch Spannschraubeweg indicative value to compare with a set point for the Spannschraubenweg Indikationswert and as a cause for the presence of a significant change in slope to determine a malfunction of the hydraulic expansion device, if it is clear from the comparison that the measured Spannschraubenweg indication value is outside a range around the setpoint and thus significantly smaller than the nominal value.
  • the malfunction of the hydraulic expansion chuck may be a seizure of the clamping screw in the threaded bore.
  • the evaluation and control device is designed to determine the cause of the presence of a significant change in slope by comparing a measured at the significant change in slope hydraulic pressure indication value with at least one known, characteristic of the hydraulic Dehnspann Rheinstyp setpoint for the hydraulic medium pressure indication value ,
  • the desired value for the hydraulic medium pressure indication value can be a hydraulic likmediumbuch-lndikationswert at a contact of the clamping surface with a tool or workpiece to be clamped and / or a stop of the clamping screw on a limiting the axial displacement of the clamping screw stop.
  • the evaluation and control device may be designed to conclude a contact of the clamping surface with an exciting tool or workpiece as the cause of the presence of a significant change in slope and based on this cause to conclude the achievement of a minimum clamping force as a clamping state.
  • the evaluation and control device can also be designed to: to conclude a stop of the clamping screw on a limiting the axial displacement of the clamping screw stop as a cause for the presence of a significant change in slope,
  • the evaluation and control device is designed to check whether a predetermined switch-off condition is met, and to effect a termination of a screwing of the clamping screw when the test positive.
  • the predetermined switch-off condition may be a previously known hydraulic medium pressure indication value characteristic of the hydraulic expansion-tensioning device type used in the event of a stop of the clamping screw on a stop limiting the axial adjustment of the clamping screw.
  • the signaling device expediently comprises a luminaire, a loudspeaker, a display and / or a vibration device.
  • Figure 1 is a schematic perspective view of a device according to the invention for actuating a hydraulic Dehnspann raised according to a first embodiment of the present invention
  • Figure 2 is a schematic perspective view of a device according to the invention for actuating a hydraulic expansion chuck according to a second embodiment of the present invention; a schematic perspective view of a device according to the invention for operating a hydraulic expansion device according to a third embodiment of the present invention; a schematic perspective view of a device according to the invention for actuating a hydraulic expansion device according to a fourth embodiment of the present invention; a schematic perspective view of a device according to the invention for operating a hydraulic expansion chuck device according to a fifth embodiment of the present invention; a schematic perspective view of an actuatable by a method according to the present invention Hydro-Dehnspannfutters; a sectional view taken along a longitudinal center plane of the hydraulic expansion chuck of Figure 6; a sectional view taken along the section line VIII-VIII in Figure 7; and a torque curve as a function of the angle of rotation for a hydraulic expansion chuck without or with tools in a central tool holder.
  • FIGS. 1 to 5 show schematic perspective views of a device according to the invention for actuating a hydraulic expansion chuck 1 according to five different embodiments of the present invention.
  • the device 1 according to the invention has, in all five embodiments, a holding device 2 in which a hydraulic unit is mounted -Dehnspann Rhein 3 is fixed in the form of a hydraulic expansion chuck.
  • the hydraulic expansion chuck 3 is shown in detail in FIGS. 6 to 8. It comprises a basic body arrangement 4 with a main body 5, which at its rear end region has a machine interface 6, by means of which the hydraulic expansion chuck 3 is fixed to the holding device 2, and on its opposite side has a clamping region 7.
  • a threaded bore 8 is introduced from the outside into the main body 5, in which a clamping screw 9 is screwed.
  • the threaded bore 8 has at its inner end an axial displacement of the clamping screw 9 within the threaded bore 8 limiting stop 10.
  • a cylinder bore 1 1 Adjacent to the threaded bore 8 in the axial direction, a cylinder bore 1 1, in which a clamping piston 12 is located, which is connected on one side with the clamping screw 9 and on its opposite side with a sealing element 13.
  • the main body assembly 4 is in addition to the main body 5 still from an expansion sleeve 14.
  • the expansion sleeve 14 is metallically connected to form a Dehnbüchse 14 surrounding pressure chamber 15 in the clamping portion 7 of the body 5 with the main body 5 and forms a front end face 16 of the main body fifth open tool holder 17.
  • the pressure chamber 15 thus has a wall 18 which defines a clamping surface 19 on a side facing away from the pressure chamber 15 side.
  • connection channels to form one with a hydraulic medium filled pressure chamber system with the cylinder bore 1 1 and the threaded hole 8 connected and thus acted upon by the hydraulic medium.
  • a tool 20 is inserted into the tool holder 17.
  • the device 1 according to the invention in all five embodiments, an electric screw 21 with a motor on which a hexagon bit 22 is rotatably supported as a rotary tool.
  • the device 1 according to the invention also has, in all five embodiments, a measuring device 23 which comprises an ammeter and an encoder. Both the ammeter and the encoder are integrated in the electric screw 21.
  • the measuring device 23 also includes a mounted on the outside of the base body 5 strain gauge 24, which is not shown in Figures 1 to 5 for the sake of clarity.
  • the device 1 according to the invention has an evaluation and control device 25 connected to the measuring device 23 as well as a signaling device 26 connected to the evaluation and control device 25 in the form of two LED lights.
  • the holding device 2 for the hydraulic expansion chuck 3 is a stationary holder which is fixed on a base plate 27 of the device 1.
  • the device 1 additionally comprises an adjusting device 28 which has a holder 29 for the electric screw 21 and a 1-axis kinematics 30 summarized.
  • the adjusting device 28 is also fixed on the base plate 27.
  • the holding device 2 for the hydraulic expansion chuck 3 comprises a displaceable shaft 31 and two pivot joints 32 and thus has a translational and two rotational degrees of freedom in order to align and position the hydraulic expansion chuck 3 to be able to adjust.
  • the holding device 2 is fixed on a base plate 27 of the device 1.
  • the device 1 has an adjusting device 28 which comprises a holder 29 for the electric screwing device 21 and a 1-axis kinematics 30.
  • the adjusting device 28 is also fixed on the base plate.
  • the holding device 2 for the hydraulic expansion chuck 3 is a stationary holder which is fixed on a base plate 27 of the device 1.
  • the device 1 also has here an adjusting device 28.
  • the adjusting device 28 is not a 1-axis kinematics, but an industrial robot.
  • the holding device 2 for the hydraulic expansion chuck 3 is a stationary holder which is fixed on a base plate 33 of a gripping robot arrangement 34. From a connected to the base plate 33, vertically extending main unit 35 of the gripping robot assembly 34 projects a gripping arm 36 for feeding and discharging to be operated hydraulic expansion chucks.
  • the device 1 has an adjusting device 28 which comprises a holder 29 for the electric screwing device 21 and a 1-axis kinematics 30. The Adjustment device 28 is connected to the base plate 33 of the gripper robot assembly 34.
  • the hydro-expansion chuck 3 holding device 2 is a stationary support having a base plate 37 that includes through-holes 38 for fixing the holding device 2 to a table.
  • the device 1 according to the fifth embodiment does not include an adjusting device 28.
  • the electric screwing device is designed as a mobile cordless screwdriver which can be charged via a loading device.
  • the electric screwing device 21 is aligned either manually - as in the fifth embodiment - or automatically by means of the adjusting device 28 - as in the first four embodiments - relative to the hydraulic expansion chuck 3 and engaged with the tightening screw 9.
  • an arrow indicates in which direction the alignment takes place.
  • the clamping screw 9 is now screwed by means of the electric screw 21 in the threaded hole 8 until the clamping screw 9 comes to rest on the stop 10.
  • the torque applied to the hydraulic expansion chuck 3 during the screwing in of the clamping screw 9 is supported by the holding device 2.
  • the clamping screw 9 is adjusted axially when screwing into the threaded hole 8.
  • the clamping screw 9 Since the clamping screw 9 is connected to the clamping piston 12, causes the axial adjustment of the clamping screw 9 and an axial adjustment of the clamping piston 12 together with the sealing element 13. As a result, the hydraulic medium is pressed within the pressure chamber system in the direction of the pressure chamber 15, whereby the wall 18 elastic deformed or expanded hydraulically becomes. As a result of the widening of the wall 18, a joining play between the wall 18 and the tool 20 to be clamped is first of all compensated and the wall 18 is then pressed against the tool 20 to be clamped, whereby a frictional connection between the hydraulic expansion chuck 3 and the tool 20 results.
  • the strain gauge 24 of the measuring device 23 measures a deformation, in particular an expansion, of the main body 5 as a variable complementary to the pressure of the hydraulic medium as hydraulic medium pressure indication values.
  • the measuring device 23 measures by means of the ammeter the motor current of the electric screw 21 at a constant engine speed and thus indirectly the torque of the clamping screw as a further to the pressure of the hydraulic medium complementary size as hydraulic medium pressure indication values in predetermined, uniform intervals.
  • the measuring device 23 measures by means of the encoder the angle of rotation of the clamping screw 9 as a complementary to the axial path position of the clamping screw 9 within the threaded bore 8 size as Spannschraubenweg indicative values in predetermined, uniform measuring distances.
  • the measurement of the angle of rotation begins in this embodiment with the occurrence of a trigger event, namely the contact of the clamping surface 19 with the tool 20.
  • a trigger event namely the contact of the clamping surface 19 with the tool 20.
  • the measurement can also start at another time or take place from the beginning.
  • the measuring distance between two directly successively measured torques corresponds to the measuring distance between two directly consecutively measured angles of rotation. After a rotation of the clamping screw 9 by a certain angular range so in each case the torque is measured on the clamping screw 9.
  • the evaluation and control device 25 checks whether a measured during the tightening of the clamping screw 9 torque or a measured deformation within a predefined range to a characteristic of the hydraulic expansion chuck 3 torque or a characteristic deformation, and includes one of the characteristic Torque or the characteristic deformation associated clamping state, if the test is positive.
  • a characteristic torque / deformation on the one hand a characteristic torque / deformation in a contact of the clamping surface 19 with the tool 20 and the associated clamping state of the contact between the clamping surface 19 and the tool 20 and the achievement of a minimum clamping force.
  • the characteristic torque / deformation is a characteristic torque / deformation at a stop of the clamping screw 9 on the stop 10 and the associated clamping state reaching a predefined set clamping force.
  • the evaluation and control device 25 calculates slopes of the measured torques, wherein a slope from the amount of a difference between each two immediately successively measured torques is formed as a dividend and the measuring distance between the two considered torques as a divisor. Now, the evaluation and control device 25 determines a change in slope between each two calculated slopes, which were calculated from three directly successively measured torques. For this purpose, the two calculated slopes are divided. Subsequently, it is checked whether the specific slope change is outside a predefined range, and thus there is a significant change in slope. For example, a significant slope change occurs when the slopes are many times different. Now, a possible cause for a noticeable change in slope is is correct and based on the specific cause closed to a clamping state.
  • the cause of the presence of a significant change in slope is determined by comparing a measured during the significant change in slope torque with at least one previously known, characteristic of the hydraulic expansion chuck setpoint for the torque.
  • the desired value for the torque is a torque at a contact of the clamping surface 19 with the tool 20 and / or at a stop of the clamping screw 9 on the stop 10.
  • the measured rotation angle are used.
  • the measured during the significant change in slope angle of rotation is compared with at least one known, characteristic of the hydraulic expansion chuck 3 setpoint for the rotation angle. If it is found that the measured angle of rotation is significantly smaller than the target value, a malfunction of the hydraulic expansion chuck 3, such as a seizure of the clamping screw 9, is determined as the cause for the presence of the significant change in pitch.
  • the respective particular state of tension is then displayed to a user via a lighting up of a corresponding LED light 26.
  • FIG. 9 qualitatively shows two typical measuring curves which can be obtained during the previously described actuating method during screwing in of the clamping screw 9. Specifically, the measured torques are plotted against the measured angles of rotation.
  • the measuring curve designated II shows a typical torque curve in the event that a tool 20 is in the tool holder 17 of the hydraulic expansion chuck 3.
  • the trace has three sections each of different pitch.
  • a first section (1) the torque in an approximation is linearly proportional to a strain rate of the wall 18.
  • a screwing of the clamping screw 9 causes an expansion of the wall 18.
  • the clamping surface 19 contacts the shank of the tool 20, which at point A of the trace II, there is a positive pressure jump, ie a sudden increase in the pressure of the hydraulic medium in the pressure chamber system of the hydraulic expansion chuck 3, which is noticeable by a significant increase in the slope of the trace.
  • the first section thus merges into a second section with a significantly higher gradient than the first section.
  • this second section no change in the expansion rate occurs. Rather, it comes with a further screwing the clamping screw 9 in the direction of the stop 10 to an increase in the pressure of the hydraulic medium.
  • hydraulic media in particular hydraulic oils, are included in the high pressures prevailing in hydraulic expansion chucks. least slightly compressible.
  • the torque in the second section is linearly proportional to the pressure of the hydraulic medium.
  • the point B of the measuring curve II therefore indicates a chronologically second pressure jump.
  • the second section merges into a third section with a significantly higher slope than the second section.
  • the fact that the tensioning screw 9 can still be turned a little further in the third section depends inter alia on the fact that components of the hydraulic expansion chuck 3, such as the stop 10, are still compressed slightly elastically.
  • the measurement curve designated I shows a typical torque curve in the event that no tool 20 is in the tool holder 17 of the hydraulic expansion chuck 3.
  • the measurement curve has only one pressure jump at the point B, which is due to the fact that the clamping screw 9 reaches the stop 10. Since there is no tool 20 in the tool holder 17, there can be no further pressure jump at the point A, since it can never happen that the clamping surface 19 contacts the tool 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gripping On Spindles (AREA)

Abstract

L'invention concerne un procédé d'actionnement d'un appareil de serrage expansible hydraulique (3) comprenant un arrangement de corps de base (4) dans lequel est formé un système de chambre de compression rempli d'un fluide hydraulique, lequel comporte une chambre de compression (15) munie d'une paroi (18) qui définit un côté d'une surface de serrage (19) à l'opposé de la chambre de compression (15), et un orifice taraudé (8) pratiqué depuis l'extérieur dans l'arrangement de corps de base (4) et relié à la chambre de compression (15) par le biais de canaux de liaison. Une vis de serrage (9) est vissée dans l'orifice taraudé (8), laquelle est positionnée dans le sens axial par vissage dans l'orifice taraudé (8) de telle sorte que le fluide hydraulique est poussé en direction de la chambre de compression (15) et la paroi (18) est déformée par effet élastique afin de serrer un outil (20) ou une pièce. Avec le procédé, la vis de serrage (9) est tournée au moyen d'un outil de tournage (22), le couple appliqué à l'appareil de serrage expansible hydraulique (3) est notamment soutenu par blocage de l'appareil de serrage expansible hydraulique (3) dans un support fixe (2), des valeurs indicatives de la pression de fluide hydraulique sont mesurées au moyen d'un dispositif de mesure (23) à des intervalles de mesure réguliers prédéfinis et/ou continuellement pendant la rotation de la vis de serrage (9), un état de serrage de l'appareil de serrage expansible hydraulique (3) est déterminé en interprétant les valeurs indicatives de la pression de fluide hydraulique mesurées au moyen d'un dispositif d'interprétation et de commande (25) et l'état de serrage déterminé de l'appareil de serrage expansible hydraulique (3) est signalé à un utilisateur au moyen d'un dispositif de signalisation (26). L'invention concerne en outre un dispositif (1) d'actionnement d'un appareil de serrage expansible hydraulique (3).
EP18705851.6A 2017-02-07 2018-02-06 Procédé et dispositif d'actionnement d'un appareil de serrage expansible hydraulique Pending EP3580000A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102017102380 2017-02-07
DE102017114536.2A DE102017114536B3 (de) 2017-02-07 2017-06-29 Verfahren und Vorrichtung zum Betätigen einer Hydro-Dehnspanneinrichtung
PCT/EP2018/052940 WO2018146092A1 (fr) 2017-02-07 2018-02-06 Procédé et dispositif d'actionnement d'un appareil de serrage expansible hydraulique

Publications (1)

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EP3580000A1 true EP3580000A1 (fr) 2019-12-18

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EP18705851.6A Pending EP3580000A1 (fr) 2017-02-07 2018-02-06 Procédé et dispositif d'actionnement d'un appareil de serrage expansible hydraulique

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EP (1) EP3580000A1 (fr)
JP (1) JP7109456B2 (fr)
DE (1) DE102017114536B3 (fr)
WO (1) WO2018146092A1 (fr)

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CH712564A1 (de) * 2016-06-07 2017-12-15 Rego-Fix Ag Spannvorrichtung zum Einspannen eines Werkzeugs in einen Werkzeughalter.
DE102018118893A1 (de) * 2018-08-03 2020-02-06 Turck Duotec GmbH Druckmesseinrichtung
DE102019115386A1 (de) * 2019-06-06 2020-12-10 Wto Vermögensverwaltung Gmbh Bedienschlüssel für stehende und angetriebene Werkzeughalter
DE102019115607A1 (de) 2019-06-07 2020-12-10 E. Zoller Gmbh & Co. Kg Multispann- und Mess- und/oder Einstellstation für Werkzeuge und Verfahren zur Montage/Demontage eines Werkzeugs in/aus einer Werkzeugaufnahme
JP7298780B2 (ja) 2020-05-01 2023-06-27 株式会社ニコン 化合物、樹脂前駆体、硬化物、光学素子、光学系、カメラ用交換レンズ、光学装置、接合レンズ、及び接合レンズの製造方法
CN111975452A (zh) * 2020-08-26 2020-11-24 山东理工大学 用于切削加工的立式双向扭矩调整装置
CN118455566B (zh) * 2024-07-12 2024-09-06 江苏艾维基业智能科技有限公司 一种四爪双动作动力卡盘

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JP7109456B2 (ja) 2022-07-29
DE102017114536B3 (de) 2018-07-05
JP2020506076A (ja) 2020-02-27

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