EP2262612A1 - Dispositif de surveillance de machine-outil - Google Patents

Dispositif de surveillance de machine-outil

Info

Publication number
EP2262612A1
EP2262612A1 EP08873140A EP08873140A EP2262612A1 EP 2262612 A1 EP2262612 A1 EP 2262612A1 EP 08873140 A EP08873140 A EP 08873140A EP 08873140 A EP08873140 A EP 08873140A EP 2262612 A1 EP2262612 A1 EP 2262612A1
Authority
EP
European Patent Office
Prior art keywords
machine tool
monitoring device
tool
monitoring
ultra
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.)
Ceased
Application number
EP08873140A
Other languages
German (de)
English (en)
Inventor
Juergen Seidel
Heiko Braun
Juergen Hasch
Lars Weikert
Jo Pletinckx
Alexander Werner Hees
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP11180122.1A priority Critical patent/EP2394781A3/fr
Publication of EP2262612A1 publication Critical patent/EP2262612A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0078—Safety devices protecting the operator, e.g. against accident or noise
    • B23Q11/0082—Safety devices protecting the operator, e.g. against accident or noise by determining whether the operator is in a dangerous position
    • 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
    • B23Q17/24—Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves
    • B23Q17/2433—Detection of presence or absence
    • B23Q17/2438—Detection of presence or absence of an operator or a part thereof
    • 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
    • B23Q17/24—Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves
    • B23Q17/248—Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves using special electromagnetic means or methods
    • B23Q17/249—Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves using special electromagnetic means or methods using image analysis, e.g. for radar, infrared or array camera images
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/147—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using electro-magnetic technology, e.g. tags or radar
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/0209—Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/04—Systems determining presence of a target
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
    • G01S13/24—Systems for measuring distance only using transmission of interrupted, pulse modulated waves using frequency agility of carrier wave
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/56—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/288—Coherent receivers
    • G01S7/2886—Coherent receivers using I/Q processing

Definitions

  • the invention relates to a machine tool monitoring device according to the preamble of claim 1.
  • a machine tool monitoring device for a circular saw is known. This has a sensor unit for generating and detecting an electromagnetic signal, which is arranged in the vicinity of a saw blade. An approaching one
  • Body part of the saw blade can be detected by monitoring the signal spectrum.
  • the invention relates to a machine tool monitoring device with a detection unit for detecting an application situation in a machine tool.
  • the detection unit enables a position and / or speed determination.
  • movement of an object in a monitoring area monitored by the machine tool monitoring device can be advantageously characterized. This can quickly detect a movement which indicates a potential danger to an operator of the machine tool become.
  • a "position determination” is to be understood as meaning, in particular, the determination of the position of an object monitored by the machine tool monitoring device relative to an active object of the machine tool, in particular relative to a tool, preferably in its driven state at least one movement characteristic from the group movement direction, instantaneous speed value and momentary acceleration value of an object moving relative to an active object of the machine tool can be understood.
  • the machine tool monitoring device has at least one ultra-wideband radar sensor.
  • an "ultra-wideband radar sensor” is to be understood as meaning, in particular, a radar sensor by means of which an ultra-wideband radar signal can be generated, transmitted, received and / or evaluated With such a sensor, a plurality of discrete, narrow-band frequencies can also be generated all are within the ultra-wideband spectrum, are generated, transmitted, received and / or evaluated, and pseudo-noise coding of the transmission signal can also be used as a modulation method for the system according to the invention under an "ultra wide band (or ultra wide band or UWB) spectrum".
  • an electromagnetic frequency bandwidth should be understood, which has a useful frequency range with a center frequency in the frequency range from 1 GHz to 15 GHz and a frequency bandwidth of at least 500 MHz.
  • a stepped frequency measuring method can be used as the modulation method for the transmission signal.
  • the system according to the invention may include a modulation method
  • the ultra-wideband radar sensor is part of the detection unit.
  • High security can be achieved if the position and / or velocity determination is a position and / or velocity determination of human or animal tissue.
  • this recognition of human or animal tissue takes place by means of a spectral evaluation of a radar signal. Since such a fabric has a high attenuation effect in a frequency range above 2 GHz, for a continuous frequency spectrum that can cover this range or for discrete frequencies in this frequency range a high discrimination can be achieved.
  • the recognition unit has a means which is provided to associate at least one security measure with a movement feature of a monitored object.
  • This characteristic movement feature may comprise a direction of movement, e.g. is directed to the active object, or exceeding a predetermined threshold value of the instantaneous speed of the object and / or the instantaneous acceleration of the object, which may indicate a slippage of a body part of an operator on a workpiece.
  • the safety measure is preferably carried out by means of an actuator unit which is in operative connection with the detection unit.
  • the safety shutdown may be a stopping of a drive unit for driving a tool of the machine tool.
  • the detection unit has a means which is intended to classify a movement feature of a monitored object. In this way, a particularly short reaction time can be achieved by determining only one speed level, such as "fast”, “medium speed”, “slow”, etc., and one safety level being assigned to one speed level.
  • the key parameter to be understood in particular is the assignment of the parameter to a predefined interval.
  • a particularly effective detection can be achieved if the machine tool monitoring device, in particular the detection unit, has an antenna array.
  • an antenna array is in this context, in particular a
  • the antenna array expediently has at least one ultra-wideband radar antenna.
  • phase-variable antenna array should be understood as meaning, in particular, an antenna array which is assigned at least one phase shifting means which is provided for changing at least one relative phase position between two signals radiated by different antennas of the antenna array.
  • the recognition unit defines at least two monitoring areas for monitoring an application process of the machine tool.
  • the monitoring areas are preferably formed differently from each other.
  • the monitoring areas may be formed separately or they may be adjacent to each other or they may form a common overlap area.
  • a first overlapping area may comprise a second surveillance area.
  • the detection unit define a monitoring area close to the tool and a monitoring area remote from the tool relative to a tool, and in at least one monitoring mode, a speed determination of an object moving in the tool-remote monitoring area takes place.
  • a “near-tool” monitoring area “relative to a tool” is to be understood in particular as a monitoring area, which preferably consists of points which have a smallest distance to the tool which is at most a first maximum value, wherein a monitoring area is located under a “tool-distant” monitoring area is to be understood, which is composed at least of points which have a smallest distance to the tool, which is greater than the first maximum value and preferably at most a second, compared to the first maximum value greater maximum value
  • the tool-near monitoring area and the tool-remote monitoring area can over - Läppen or may be formed separately from each other, and they may be separated from each other by another monitoring area.
  • the monitoring areas each have a different operating mode of the machine tool is assigned, whereby a high flexibility in the application of the machine tool can be achieved.
  • At least one of the monitoring areas is assigned a warning mode of the machine tool.
  • At least one of the monitoring areas is assigned a removal of a driven tool from the monitoring area, whereby a potential risk of injury can be effectively eliminated.
  • the "removal" of the driven tool which is preferably carried out by means of an Aktorikiki operatively connected to the detection unit, in particular by adjusting the driven tool in a safety position outside the monitoring area, such as by means of a countersinking of the driven tool below a machine tool work surface be realized by switching off the drive of the tool and / or by covering a cutting edge of the tool.
  • At least one of the monitoring areas is assigned a safety shutdown of the machine tool, whereby a high operating safety of the machine tool can be achieved.
  • the recognition unit makes it possible to distinguish between human or animal tissue on the one hand and wood or metal or plastics on the other hand, whereby different processes can be initiated depending on the type of material detected. If human tissue is detected, the safety measures described above can be initiated.
  • detection operations for characterizing a workpiece condition such as a workpiece condition, can be performed. humidity, thickness, feed rate, etc. are introduced.
  • the recognition unit comprises a computing unit which is provided to recognize the application situation by an evaluation of parameters based on a fuzzy and / or neural logic.
  • a blurred Logic can be quickly evaluated by the arithmetic unit based on the detected signal a large and complex amount of information.
  • a fuzzy logic represents a logic that associates the occurrence of a particular event with a probability value in the interval between 0 (false) and 1 (true).
  • the recognition unit has a database in which a set of parameters is assigned an application status.
  • a particularly rapid recognition process of an application situation can advantageously be achieved by examining a correlation between the acquired parameters and an application situation.
  • a method for detecting an application situation in an application process of a machine tool in which at least one parameter from the detection of human or animal tissue is detected for detecting the application situation, whereby a high degree of safety in the application of the machine tool can be achieved.
  • 1 shows a table saw in a view from above with a monitoring device for monitoring monitoring areas
  • 2 is a schematic representation of the monitoring device
  • FIG. 3 shows an ultra-wideband beam emitted by the monitoring device.
  • FIG. 1 shows a machine tool 10 embodied as a table saw in a view from above.
  • the latter has a tool 12 embodied as a saw blade, which is driven in an operation by means of a machine tool drive unit 14, designed as an electric motor and shown in FIG. 2, which is arranged inside a non-visible motor housing.
  • a machine tool drive unit 14 designed as an electric motor and shown in FIG. 2, which is arranged inside a non-visible motor housing.
  • the machine tool 10 is provided with a machine tool working surface 18 formed by a saw table.
  • machine work surface 18 aligned horizontally.
  • the tool 12 projects out of the motor housing through a gap 20 recessed in the machine tool working surface 18 in the vertical direction.
  • the machine tool 10 is further provided with a machine tool monitoring device 22.
  • This has a recognition unit 24, which is provided for detecting an application situation in an application of the machine tool 10.
  • the recognition unit 24 is designed to detect the presence of a human body part in a danger zone as well as a critical movement of the body part with respect to a potential injury.
  • the recognition unit 24 is provided with a plurality of ultra-wideband radar sensors 26, 28.1 to 28.3 and 30.1 to 30.3. They each have an ultra-wideband radar antenna 32, which is provided for radiating or for receiving an ultra-wideband radar signal or a plurality of discrete frequencies over a UWB spectral range.
  • the detection unit 24 with the design of the ultra-wideband radar sensors 26, 28, 30 defines three different monitoring areas 34, 36, 38 for monitoring an application process of the machine tool 10.
  • the boundaries of the monitoring areas 34, 36, 38 in the machine tool work surface 18 are shown schematically by dashed lines.
  • the monitoring areas 34, 36, 38 extend horizontally in the machine tool work surface 18 as well as vertically upwards, i. they have a height relative to the machine tool work surface 18.
  • the monitoring areas 34, 36, 38 are schematically delimited by sharp lines for the sake of clarity.
  • the monitoring areas 34, 36, 38 may form overlapping areas in pairs, each of which extends in a zone of the machine tool work surface 18 on either side of one of the imaginary boundary lines.
  • a first tool-near monitoring area 34 corresponds to a tool area which extends in the immediate vicinity of the tool 12 and in this case adjoins the outer contour of the tool 12.
  • the first surveillance area is established
  • the detection unit 24 also defines a second, remote tool monitoring area 36 fixed, which adjoins the first, tool-near monitoring area 34 and this encompasses. It is composed at least of points that have a smallest distance to the tool 12, which is greater than Di cm and maximum D 2 cm, wherein the distance D 2 > Di, for example, 15 cm. Furthermore, the detection unit 24 defines a third, remote tool monitoring area 38, which adjoins the second monitoring area 36, this encompasses and at least composed of points that have a minimum distance from the tool 12 of at least D 2 cm.
  • the monitoring regions 34, 36, 38 are arranged substantially in front of the tool 12 in a workpiece sliding direction 40 into which a workpiece 16 to be machined is pushed on the tool working surface 18. In this case, an object moving in the workpiece sliding direction 40 onto the tool 12 successively engages in the third monitoring area, in the second and finally in the first monitoring area.
  • the embodiment of the monitoring areas 34, 36, 38 shown in FIG. 1 is exemplary. By designing the ultra-wideband radar sensors 26, 28, 30 further forms of the monitoring areas 34, 36, 38 can be achieved.
  • the first tool-near monitoring area 34 is determined by means of the ultra-wideband radar sensor 26.
  • the monitoring area 36 is assigned to three ultra-wideband radar sensors 28.1 to 28.3, wherein the corresponding ultra-wideband radar antennas 32 are designed in a first antenna array 42.
  • the monitoring area 38 is assigned to three ultra-wideband radar sensors 30.1 to 30.3, wherein the corresponding ultra-wideband radar antennas 32 are defined in a second antenna array 44.
  • the antenna arrays 42, 44 are designed as phase-variable antenna arrays.
  • the corresponding antenna array 42, 44 forming ultra-wideband radar antennas 32, are controlled.
  • a transmission signal for radiation in a preferred transmission direction can be bundled.
  • the control of the relative phase angles by means not shown in detail phase shift elements.
  • FIG. 2 shows the recognition unit 24 of the machine tool monitoring device 22 in a schematic view.
  • the detection unit 24 has the ultra-wideband Radar sensors 26, 28, 30, each comprising an ultra-wideband radar antenna 32.
  • a radar signal radiated from the ultra-wideband radar antenna 32 of the ultra-wideband radar sensor 26 is generated by a signal generating unit 48 and fed into the ultra-wideband radar antenna 32.
  • the ultra-wideband radar antenna 32 of the antenna array 42 is associated with a common signal generating unit 50, while the antenna array 44 is associated with a signal generating unit 52.
  • the ultra-wideband radar signal 46 After reflection on a monitored object, the ultra-wideband radar signal 46, or the frequencies f, which are located in its bandwidth, are received as receive signal 54 from one or more of the ultra-wideband antennas 32.
  • the radiated frequency signal can be a single ultra-wideband radar pulse
  • Radar signal 46 is shown in a spectral representation in Figure 3, with amplitude A plotted on the Y axis and frequency v plotted on the X axis.
  • the ultra-wideband radar signal 46 is transmitted at a center frequency v M of 5 GHz and a signal bandwidth ⁇ v of 2 GHz around this center frequency v M.
  • the transfer function of the system can be measured by arbitrary discrete frequencies within the UWB.
  • FIG. 8 shows a schematic representation of the frequency response for such a stepped frequency measurement method.
  • different discrete and relatively narrow-band frequencies f " are radiated, and the respective reflections of the system to be measured at these frequencies are measured.
  • the respective transfer function H (f,) can be determined in a known manner, which in turn allows a conclusion to the object to be tested.
  • the system according to the invention can also use a modulation method with pseudo-noise coding of the transmission signal in order to measure an impulse response of the object to be tested by correlating the received signal with the time-shifted transmission signal.
  • FIG. 9 shows a block diagram of such a pseudo-noise system.
  • the VCO 109 transmits a continuous wave carrier signal, which is modulated by the transmit switch 101, a pseudo-noise code (PN code).
  • PN code pseudo-noise code
  • the signal is amplified by the transmit amplifier 106b and radiated via the transmit antenna (TX).
  • a carrier offset from the transmission frequency is generated, which again receives a PN coding by the reception switch 103.
  • the reception mixer 105 sets the received signal to an intermediate frequency, which is amplified by the reception amplifier 106a.
  • the baseband mixers 107 convert the received signal from the intermediate frequency to the baseband.
  • the baseband circuit 108 amplifies, filters and performs an analog-to-digital conversion. After baseband processing, the impulse response of the test object is obtained.
  • FIG. 2 has a memory unit 58 in which a database 60 (see FIG. 4) with monitoring information is stored.
  • the arithmetic unit 56 preferably has at least one microprocessor or it may be designed as a microprocessor. Furthermore, a signal processing software is stored in the memory unit 58, which is used to evaluate the received signal 54 and is executed by the arithmetic unit 56.
  • the detection unit 24 is also operatively connected to an actuator unit 62, which can trigger safety measures from a further unit of the machine tool 10 on the basis of a detection signal of the detection unit 24.
  • the actuator unit 62 is in operative connection with the machine tool drive unit 14, so that based on a detection signal, a tool drive performed can be adapted or stopped to an application situation.
  • the Aktorikiki 62 may also be provided for driving further, not shown securing means.
  • the actuator unit 62 may drive safety means for sinking the tool 12 below the machine tool work surface 18. Other security means may be provided to cover the cutting edge of the tool 12, such as e.g. a protective cover.
  • the recognition unit 24 is also operatively connected to an output unit 64, which is provided to warn the operator in an optical, acoustic and / or haptic manner.
  • FIG. 4 shows the database 60. It is assumed that an operator wants to carry out a sawing of the workpiece 16, which is shown in FIG. For this purpose, the workpiece 16 is set up on the machine tool work surface 18. This application situation is referred to as application situation 66 in FIG.
  • the placement of the workpiece 16 induces a change in the surrounding the detection unit 24 dielectric, which is reflected in a change of the received signal 54. For example, after setting up a resonant frequency in the frequency spectrum of the received signal 54 is shifted.
  • the arithmetic unit 56 can assign the application situation 66 to this detected received signal 54. This is done by means of the database 60. In this table, characteristic values, for example A 3 , B 2 , etc., are assigned to an application situation A or B etc.
  • the arithmetic unit 56 examines, for example, a correlation between the received signal 54 and the signal patterns until a signal pattern 70 which has the greatest correlation with the detected received signal 54 is determined.
  • the determination of the signal pattern 70 and therefore of the applicable application situation 66 is performed by the arithmetic unit 56 by means of a method of fuzzy logic (fuzzy logic) for evaluating the spectrum of the received signal 54.
  • a learning mode of the machine tool is provided.
  • application situations may be deliberately created by the operator, and the computing unit 56 may independently learn to recognize such application situations and determine which policies are appropriate for those application situations.
  • the arithmetic unit 56 learns to correlate these application situations with one or more signal patterns in each case.
  • the arithmetic unit 56 operates in this mode on the basis of a neural logic that allows such a self-learning function. The operator can set a security level at any time until a desired procedure for a particular application situation is reached. This can be automatically stored in the database 60.
  • the mode of operation of the machine tool monitoring device 22 will be described in more detail with reference to FIGS. 5 to 7.
  • the penetration of the workpiece 16 into the monitoring area 38 is detected by the detection unit 24.
  • the recognition unit 24 by means of the recognition unit 24, as described above, based on signal patterns of the database
  • the recognition unit 24 detects the position of the hand in the monitoring area 38. Furthermore, the recognition unit 24 carries out a speed determination by detecting movement characteristics which characterize the movement of the hand relative to the rotating tool 12.
  • a direction of movement 76 By detecting the position of the hand relative to the tool 12 at different times in this case a direction of movement 76, the instantaneous value of the speed and the acceleration of the hand by means of the computing unit 56 are detected.
  • This is in turn assigned to a procedure carried out as a safety measure 82, in which the actuator unit 62 actuates a safety shutdown of the machine tool 10, namely the machine tool drive unit 14.
  • the arithmetic unit 56 serves as a means 84, which, in particular via the database 60, assigns to a detected movement feature of the monitored hand a safety measure, namely the safety shutdown of the machine tool drive unit 14.
  • a safety measure namely the safety shutdown of the machine tool drive unit 14.
  • the instantaneous value of the speed and / or the acceleration is classified as "slow” and "fast” with the aid of the means 84 embodied as a computing unit 56.
  • threshold value 78 is examined. Further, middle stages are conceivable.
  • the velocity determination i. the detection of at least one movement feature takes place in the monitoring area 38, which corresponds to the tool-remote monitoring area with the largest minimum distance to the tool 12.
  • the safety shutdown can be made in good time, so that contact of the hand with the tool 12 in its driven state can be avoided.
  • This type of detection in already an outer zone provides a longer time for deactivating the tool drive.
  • the further monitoring areas 34, 36 are assigned different operating modes of the machine tool 10.
  • the monitoring area 36 is assigned a warning mode. If, as shown in FIG. 6, the operator's hand is detected in the monitoring area 36, then in a first warning mode, the detection unit 24 triggers a warning output by means of the output unit 64. In this warning mode or in another warning mode, the operator is warned in cooperation with the machine tool driving unit 14 by means of a slowing down of the tool drive, i. by reducing the rotational speed during the rotation of the tool 12.
  • the tool-near monitoring area 34 is assigned an actuator mode of the machine tool 10. If, as shown in FIG. 7, the presence of the hand in the monitoring area 34 close to the tool is detected, a safety shutdown of the machine tool drive unit 14 is triggered immediately by means of the actuator unit 62.
  • the machine tool monitoring device 22 can be used to advantage in other stationary machine tools, such. for band saws, chop saws, panel saws, pull saws, etc.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Auxiliary Devices For Machine Tools (AREA)

Abstract

La présente invention concerne un dispositif de surveillance de machine-outil équipé d’une unité de détection (24) pour détecter une situation d’application (66, 80) pour une machine-outil (10), l’unité de détection (24) permettant de déterminer la position et/ou la vitesse d’un tissu humain ou animal. Selon l’invention, le dispositif de surveillance de machine-outil présente au moins un capteur radar à bande ultra-large (26, 28, 30). De plus, l’invention concerne une machine-outil équipée d’un tel dispositif de surveillance de machine-outil.
EP08873140A 2008-03-06 2008-11-28 Dispositif de surveillance de machine-outil Ceased EP2262612A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11180122.1A EP2394781A3 (fr) 2008-03-06 2008-11-28 Dispositif de surveillance de machines-outils

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008013055A DE102008013055A1 (de) 2008-03-06 2008-03-06 Werkzeugmaschinenüberwachungsvorrichtung
PCT/EP2008/066441 WO2009109250A1 (fr) 2008-03-06 2008-11-28 Dispositif de surveillance de machine-outil

Publications (1)

Publication Number Publication Date
EP2262612A1 true EP2262612A1 (fr) 2010-12-22

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EP08873140A Ceased EP2262612A1 (fr) 2008-03-06 2008-11-28 Dispositif de surveillance de machine-outil
EP11180122.1A Withdrawn EP2394781A3 (fr) 2008-03-06 2008-11-28 Dispositif de surveillance de machines-outils

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EP11180122.1A Withdrawn EP2394781A3 (fr) 2008-03-06 2008-11-28 Dispositif de surveillance de machines-outils

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EP (2) EP2262612A1 (fr)
DE (1) DE102008013055A1 (fr)
TW (1) TW201006603A (fr)
WO (1) WO2009109250A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102009005745B4 (de) * 2009-01-23 2011-09-01 Ott-Jakob Spanntechnik Gmbh Vorrichtung zur Überwachung der Lage eines Werkzeugs oder Maschinenelements
DE102009046040A1 (de) 2009-10-27 2011-05-05 Robert Bosch Gmbh Überwachungsvorrichtung einer Werkzeugmaschine
TWI402130B (zh) * 2011-01-12 2013-07-21 Ind Tech Res Inst 碰撞保護方法及其裝置
CN102744556A (zh) * 2011-04-18 2012-10-24 鸿富锦精密工业（深圳）有限公司 安全防护装置
TWI409401B (zh) * 2011-05-30 2013-09-21 Hon Hai Prec Ind Co Ltd 意外防止系統及方法
TWI608894B (zh) * 2015-11-18 2017-12-21 Intelligent anti-collision safety system and tool machine using the same

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CA2448479C (fr) * 2002-11-12 2009-05-05 Makita Corporation Outils mecaniques
WO2005033728A2 (fr) * 2003-05-22 2005-04-14 General Atomics Systeme radar a bande ultra-large utilisant des impulsions codees de sous-bandes
JP2005088248A (ja) * 2003-09-12 2005-04-07 Makita Corp 動力工具
DE102005054128A1 (de) 2005-11-14 2007-05-16 Bosch Gmbh Robert Werkzeugmaschinenüberwachungsvorrichtung
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Title
See also references of WO2009109250A1 *

Also Published As

Publication number Publication date
EP2394781A3 (fr) 2013-05-15
EP2394781A2 (fr) 2011-12-14
WO2009109250A1 (fr) 2009-09-11
DE102008013055A1 (de) 2009-11-12
TW201006603A (en) 2010-02-16

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