WO2022014510A1 - 圧縮流体供給システム - Google Patents

圧縮流体供給システム Download PDF

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Publication number
WO2022014510A1
WO2022014510A1 PCT/JP2021/026062 JP2021026062W WO2022014510A1 WO 2022014510 A1 WO2022014510 A1 WO 2022014510A1 JP 2021026062 W JP2021026062 W JP 2021026062W WO 2022014510 A1 WO2022014510 A1 WO 2022014510A1
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WO
WIPO (PCT)
Prior art keywords
compressed fluid
pressure
fluid supply
supply system
support member
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
PCT/JP2021/026062
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
室田真弘
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.)
Fanuc Corp
Original Assignee
Fanuc Corp
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 Fanuc Corp filed Critical Fanuc Corp
Priority to CN202180060048.XA priority Critical patent/CN116157229A/zh
Priority to DE112021003833.8T priority patent/DE112021003833T5/de
Priority to JP2022536336A priority patent/JPWO2022014510A1/ja
Priority to US18/016,163 priority patent/US20230271283A1/en
Publication of WO2022014510A1 publication Critical patent/WO2022014510A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/38—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • 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
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/38—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports
    • B23Q1/385—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports in which the thickness of the fluid-layer is adjustable
    • 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
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
    • 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
    • B23Q17/09—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool
    • B23Q17/0952—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool during machining
    • B23Q17/0961—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool during machining by measuring power, current or torque of a motor
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
    • F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
    • F16C32/064—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being supplied under pressure
    • F16C32/0644—Details of devices to control the supply of liquids to the bearings
    • F16C32/0648—Details of devices to control the supply of liquids to the bearings by sensors or pressure-responsive control devices in or near the bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00—Apparatus used in shaping articles
    • F16C2322/39—General buildup of machine tools, e.g. spindles, slides, actuators

Definitions

  • the present invention relates to a compressed fluid supply system that supplies a compressed fluid to a support member that movably supports a movable member.
  • a drive device that supports and drives movable members with static pressure bearings is used.
  • a hydrostatic bearing is provided on the spindle of a machine tool.
  • the hydrostatic bearing rotatably supports the movable member of the spindle with respect to the fixing member of the spindle.
  • Japanese Patent Application Laid-Open No. 2017-210991 discloses an abnormality detection device for a fluid bearing that detects that a flow path to a bearing is clogged by using a pressure sensor.
  • An object of the present invention is to provide a compressed fluid supply system whose rigidity for supporting a movable member can be adjusted according to a driving state of the movable member.
  • the compressed fluid supply system drives a pressure adjusting unit that adjusts the pressure of the compressed fluid supplied from the fluid supply source to a support member that movably supports the movable member using the compressed fluid, and the movable member.
  • the pressure adjusting unit is controlled based on the driving force acquisition unit for acquiring the driving force of the motor and the driving force of the motor to adjust the pressure of the compressed fluid supplied to the support member. It is equipped with a pressure control unit.
  • FIG. 1 is a diagram showing a compressed fluid supply system according to the first embodiment.
  • FIG. 2 is a diagram showing an example of the relationship between driving force and pressure.
  • FIG. 3 is a diagram showing an example of an operation procedure of the compressed fluid supply system according to the first embodiment.
  • FIG. 4 is a diagram showing a compressed fluid supply system according to the second embodiment.
  • FIG. 1 is a diagram showing a compressed fluid supply system 10 according to the first embodiment.
  • the compressed fluid supply system 10 includes a spindle 12, a fluid supply source 14, a pressure adjusting unit 16, a motor 18, a driving force acquisition unit 20, a notification unit 22, and a control unit 24.
  • the spindle 12 has a movable member 26, a fixing member 28, and a support member 30.
  • the movable member (for example, the shaft) 26 can be driven (rotated here) with respect to the fixed member (for example, the housing) 28, and is driven (rotated) by the motor 18.
  • An article holding portion 32 is attached to the end of the movable member 26.
  • the article holding portion 32 holds an article (for example, a processing target) and rotates together with the movable member 26.
  • the fixing member 28 has a path 34 for supplying the compressed fluid from the fluid supply source 14 to the support member 30.
  • the path 34 is connected to the pressure adjusting unit 16 via the path 34a.
  • the pressure adjusting unit 16 is connected to the fluid supply source 14 via the path 34b.
  • the compressed fluid is supplied from the fluid supply source 14 to the support member 30 via the path 34b, the pressure adjusting unit 16, the path 34a, and the path 34.
  • the support member 30 is, for example, a hydrostatic bearing, and rotatably supports the movable member 26 using a compressed fluid. More specifically, the support member 30 is provided between the fixed member 28 and the movable member 26, and the movable member 26 is rotatably supported with respect to the fixed member 28 by the compressed fluid supplied from the fluid supply source 14. do.
  • the rigidity of the support member 30 changes according to the pressure P of the compressed fluid supplied to the support member 30. The higher the rigidity of the support member 30, the less likely it is that the gap between the fixed member 28 and the movable member 26 will change. As will be described later, in the present embodiment, the pressure P is changed according to the driving force F of the motor 18 to adjust the rigidity of the support member 30 that supports the movable member 26.
  • the fluid supply source 14 includes, for example, a compressor (not shown), a regulator (not shown), and the like.
  • the fluid supply source 14 supplies the compressed fluid to the support member 30 via the pressure adjusting unit 16 and the path 34.
  • the compressed fluid is a compressed (pressurized) fluid. Examples of compressed fluids include compressed gases (eg, air or nitrogen) or liquids (eg, lubricating oils).
  • the pressure adjusting unit 16 adjusts the pressure P of the compressed fluid supplied from the fluid supply source 14 to the support member 30. That is, the pressure adjusting unit 16 adjusts the pressure P of the compressed fluid supplied from the fluid supply source 14 to the pressure adjusting unit 16.
  • the pressure adjusting unit 16 supplies the compressed fluid whose pressure has been adjusted to the support member 30 via the path 34.
  • the pressure adjusting unit 16 has a plurality of compressed fluid supply paths 40, a pressure adjusting mechanism 42, and a switching mechanism 44.
  • Each of the plurality of compressed fluid supply paths 40 is connected to the fluid supply source 14 via the switching mechanism 44.
  • the plurality of compressed fluid supply paths 40 supply the compressed fluid from the fluid supply source 14 to the support member 30.
  • the plurality of compressed fluid supply paths 40 are, for example, pipes, but are not limited to pipes. In the present embodiment, it is considered to switch the three compressed fluid supply paths 40 (compressible fluid supply path A, compressed fluid supply path B, and compressed fluid supply path C).
  • the pressure of the fluid supplied from the compressed fluid supply path A to the support member 30 is defined as the pressure Pa.
  • the pressure of the fluid supplied from the compressed fluid supply path B to the support member 30 is defined as the pressure Pb.
  • the pressure of the fluid supplied from the compressed fluid supply path C to the support member 30 is defined as the pressure Pc.
  • the pressure Pa, the pressure Pb, and the pressure Pc increase in this order (Pa ⁇ Pb ⁇ Pc).
  • the pressure Pa, the pressure Pb, and the pressure Pc are shown in FIG. 2 described later.
  • the pressure adjusting mechanism 42 adjusts the pressures in the three compressed fluid supply paths 40 (compressible fluid supply path A, compressed fluid supply path B, and compressed fluid supply path C) so as to be different from each other. These pressures correspond to the stiffness of the support member 30 that supports the movable member 26.
  • the pressure adjusting mechanism 42 has three valves 46 (for example, throttle valves) provided in the three compressed fluid supply paths 40.
  • the three valves 46 are used to regulate the flow rate of each of the three compressed fluid supply paths 40.
  • the valve 46 does not have to be provided in the compressed fluid supply path 40.
  • the pressures of the fluids supplied from the three compressed fluid supply paths 40 may be different from each other by making the inner diameters of the three compressed fluid supply paths 40 different from each other.
  • the switching mechanism 44 switches the compressed fluid supply path 40 connected to the fluid supply source 14.
  • the switching mechanism 44 selects one of the three compressed fluid supply paths 40 and connects the selected compressed fluid supply path 40 to the fluid supply source 14.
  • the switching mechanism 44 can switch the compressed fluid supply path 40 connected to the fluid supply source 14.
  • the pressures in the plurality of compressed fluid supply paths 40 are different from each other. Therefore, by selecting one of the three compressed fluid supply paths 40 and connecting the selected compressed fluid supply path 40 to the fluid supply source 14, the switching mechanism 44 is supplied to the support member 30 with compression. The pressure P of the fluid can be adjusted.
  • the driving force acquisition unit 20 acquires information indicating the driving force F of the motor 18 (specifically, the driving force F in which the motor 18 rotates the movable member 26). This information means, for example, the torque of the motor 18 or the current flowing through the motor 18.
  • the driving force acquisition unit 20 includes, for example, a torque sensor that detects the torque of the motor 18 or a current sensor that detects the current supplied to the motor 18.
  • the driving force acquisition unit 20 or the control unit 24 may calculate the driving force F (for example, torque) based on the information indicating the driving force F acquired by the driving force acquisition unit 20.
  • the notification unit 22 is a voice output device (for example, a speaker), an image display device (for example, a liquid crystal display device, an EL display device), or an optical output device (for example, an LED device).
  • the notification unit 22 notifies the operator that the pressure P of the compressed fluid supplied to the support member 30 is being adjusted by using voice, an image, or light.
  • the control unit 24 is composed of, for example, hardware (processor) and software (program).
  • the control unit 24 includes a pressure control unit 48 and a notification control unit 50.
  • the pressure control unit 48 controls the pressure adjustment unit 16 (here, the switching mechanism 44) to adjust the pressure P of the compressed fluid supplied to the support member 30.
  • the pressure control unit 48 controls the pressure adjustment unit 16 so that the pressure P of the compressed fluid supplied to the support member 30 increases as the driving force F of the motor 18 increases.
  • the driving force F of the motor 18 is, for example, large at the time of roughing and small at the time of finishing.
  • the pressure control unit 48 can increase the rigidity of the support member 30 that supports the movable member 26 during roughing and decrease it during finishing.
  • the pressure control unit 48 includes a table 48a showing the relationship between the driving force F of the motor 18 and the pressure P of the compressed fluid supplied to the support member 30 or the selected compressed fluid supply path 40.
  • FIG. 2 is a diagram showing an example of the relationship between the driving force F and the pressure P, and substantially represents an example of the table 48a.
  • FIG. 2 shows the correspondence between the three drive regions Ra, the drive region Rb, and the drive region Rc and the pressure Pa, the pressure Pb, and the pressure Pc.
  • the pressure Pa, the pressure Pb, and the pressure Pc are support members when the compressed fluid supply path A, the compressed fluid supply path B, or the compressed fluid supply path C is connected to the fluid supply source 14, respectively.
  • the pressure P of the compressed fluid supplied to 30 is described above.
  • the drive region Ra, the drive region Rb, and the drive region Rc divide the driving force F. That is, depending on whether the driving force F is in the driving region Ra, the driving region Rb, or the driving region Rc, the pressure Pa, the pressure Pb, and the pressure Pc (that is, the compressed fluid supply path A, the compressed fluid supply path). B and one of the compressed fluid supply path C) are selected. For example, when the driving force F initially in the driving region Rb increases and shifts to the driving region Rc, the compressed fluid supply path 40 connected to the fluid supply source 14 supplies the compressed fluid from the compressed fluid supply path B. Switch to road C. As a result, the pressure P of the compressed fluid supplied to the support member 30 is adjusted from the pressure Pb to the pressure Pc.
  • the number of the compressed fluid supply paths 40 is three (compressible fluid supply path A, the compressed fluid supply path B, and the compressed fluid supply path C), and the driving force F is the three drive areas Ra and the drive area. It is divided into Rb and the drive region Rc.
  • the number of the compressed fluid supply paths 40 may be two or four or more, and the driving force F may be divided into two or four or more regions.
  • the table 48a may represent the relationship between the information indicating the driving force F and the pressure P of the compressed fluid supplied to the support member 30 or the selected compressed fluid supply path 40.
  • the notification control unit 50 controls the notification unit 22 and is supplied to the support member 30. Notify the operator that the pressure P of the compressed fluid is being adjusted. As a result, the operator can grasp that the pressure P of the compressed fluid supplied to the support member 30 (that is, the rigidity of the support member 30 that supports the movable member 26) is being adjusted.
  • the notification control unit 50 After the notification control unit 50 notifies that the adjustment is in progress (notification during adjustment), the notification control unit 50 informs the operator that the adjustment of the pressure P of the compressed fluid supplied to the support member 30 is completed. Notify (notification of adjustment completion). That is, when a predetermined time elapses after the pressure control unit 48 starts adjusting the pressure P, the notification control unit 50 determines that the adjustment of the pressure P of the compressed fluid supplied to the support member 30 is completed. Notify the completion of adjustment.
  • the notification control unit 50 determines the completion of the pressure adjustment based on the lapse of a predetermined time from the start of the adjustment.
  • the notification control unit 50 may determine the completion of the pressure adjustment by using the pressure detection unit 52 shown by the virtual line in FIG.
  • the pressure detecting unit 52 is provided on the main shaft 12 or the pressure adjusting unit 16 and detects the pressure P of the compressed fluid supplied to the support member 30.
  • the notification control unit 50 determines whether or not the adjustment of the pressure P is completed based on the detection signal from the pressure detection unit 52.
  • the notification control unit 50 can determine the completion of the adjustment based on whether or not the detected pressure P of the compressed fluid has reached the selected pressure.
  • the notification control unit 50 informs the operator that the adjustment of the pressure P of the compressed fluid supplied to the support member 30 is about to start. May be allowed (notification of adjustment start).
  • the sound of the first aspect (adjusting sound) and the sound of the second aspect different from the first aspect (adjustment completion sound) can be used for the notification of the adjustment being made and the adjustment completion.
  • the sound of the third aspect (adjustment start sound) different from the sound of the first aspect can be used for the notification of the start of adjustment.
  • This aspect means any of loudness (volume), pitch (pitch), sound pattern, sound spacing, or a combination thereof.
  • a continuous sound for example, "pee”
  • a single sound "pi” having a different volume or pitch from the adjustment start sound "pee” is used for the adjustment start sound and the adjustment completion sound.
  • the transition of adjustment can be clearly expressed by combining a continuous sound and two single sounds.
  • FIG. 3 is a diagram showing an example of an operation procedure of the compressed fluid supply system 10 according to the first embodiment.
  • the pressure control unit 48 uses the driving force acquisition unit 20 to acquire information indicating the driving force F of the motor 18 (step S1).
  • the pressure control unit 48 refers to the table 48a and determines whether or not the pressure P of the compressed fluid supplied to the support member 30 should be adjusted based on the acquired information (step S2). For example, when the driving force F is initially in the range of the driving region Rb, the pressure control unit 48 determines whether or not the driving force F subsequently deviates from the range of the driving region Rb.
  • the fact that the driving force F deviates from the range of the driving region Rb means that the driving force F is in the range of the driving region Rc or the range of the driving region Ra.
  • step S3 the pressure control unit 48 controls the pressure adjustment unit 16 to start the adjustment of the pressure P (step S3). That is, the pressure adjusting unit 16 is controlled by the pressure control unit 48 to switch the compressed fluid supply path 40 connected to the fluid supply source 14. If the determination in step S2 is NO, the pressure control unit 48 returns to step S1 and acquires the information of the driving force F again (step S1). The pressure control unit 48 determines whether or not the pressure P should be adjusted based on the acquired information on the driving force F (step S2).
  • the notification control unit 50 outputs a sound (adjusting sound) of the first aspect indicating that the pressure P of the compressed fluid supplied to the support member 30 is being adjusted from the notification unit 22 (step). S4).
  • the notification control unit 50 determines whether or not the adjustment is completed (step S5). If the notification control unit 50 determines YES in step S5, the notification control unit 50 outputs a sound (adjustment completion sound) of the second aspect indicating that the adjustment of the pressure P is completed from the notification unit 22 (step S6). Here, if NO is determined in step S5, the process returns to step S5. Instead of step S5, the process may return to step S4. As a result, the notification control unit 50 can continuously notify the sound being adjusted until the adjustment completion sound is output. As described above, the completion of the adjustment can be determined based on the lapse of a predetermined time (or the pressure P of the compressed fluid detected by the pressure detection unit 52) from the start of the adjustment of the pressure P.
  • the compressed fluid supply system 10 adjusts the pressure P of the compressed fluid supplied to the support member 30 based on the driving force F of the motor 18 that drives the movable member 26.
  • the rigidity of the support member 30 that supports the movable member 26 can be controlled according to the driving state of the movable member 26. For example, when the driving force F is large (for example, during roughing), the rigidity of the support member 30 is increased to enable stable roughing. Further, when the driving force F is small (for example, at the time of finishing), the rigidity of the support member 30 is reduced to enable finishing with high processing accuracy.
  • the notification control unit 50 outputs a sound during adjustment and a sound for completing adjustment. As a result, the operator can easily grasp the adjustment status of the pressure P of the compressed fluid supplied to the support member 30. As mentioned above, this pressure corresponds to the rigidity of the support member 30 that supports the movable member 26.
  • FIG. 4 is a diagram showing the compressed fluid supply system 10 according to the second embodiment.
  • the compressed fluid supply system 10 has a regulator 54 instead of the plurality of compressed fluid supply paths 40, the pressure adjusting mechanism 42, and the switching mechanism 44 in the first embodiment.
  • the pressure adjusting unit 16 has a regulator 54 (for example, an electrostatic regulator).
  • the pressure control unit 48 controls the regulator 54 to adjust the pressure P of the compressed fluid.
  • the table 48a shows the correspondence between the driving force F and the pressure P.
  • the pressure control unit 48 instructs the regulator 54 to apply the pressure P.
  • the regulator 54 has, for example, a pressure detection unit that detects the pressure of the compressed fluid in the vicinity of the valve and the support member 30. The regulator 54 opens and closes the valve so that the detected pressure is at the indicated pressure.
  • the pressure P was adjusted by switching the compressed fluid supply path 40, so that the pressure P was changed stepwise as shown in FIG.
  • fine adjustment using the regulator 54 is possible. This makes it easy to continuously change the pressure P according to the driving force F.
  • the completion of the adjustment can be determined based on the lapse of a predetermined time from the start of the adjustment of the pressure P (or the pressure of the compressed fluid detected by the pressure detection unit 52). ..
  • the pressure detection unit of the regulator 54 may be used for this determination.
  • the second embodiment is the same as the first embodiment, so detailed description thereof will be omitted.
  • the movable member 26 is rotatable with respect to the fixed member 28, and the movable member 26 is rotated by the motor 18.
  • the movable member 26 can be slid (moved) with respect to the fixed member 28, and may be slid by the motor 18.
  • the motor 18 may be either a rotary motor or a linear motor. The rotary motion of the rotary motor may be converted into a slide motion to slide the movable member 26. Further, the movable member 26 may be slid by a linear motor.
  • the driving force acquisition unit 20 acquires information indicating the driving force F.
  • the driving force F means a force by which the motor 18 slides the movable member 26.
  • the driving force acquisition unit 20 may be, for example, any of a force sensor, a torque detection unit, and a current detection unit.
  • the force sensor detects the driving force F of the motor 18 that slides the movable member 26.
  • the torque detection unit detects the torque of the motor 18.
  • the current detection unit detects the current of the motor 18. That is, the movable member 26 can be driven in a broad sense with respect to the fixed member 28. Broadly defined drives include one or both of rotations and slides.
  • the movable member 26 may be driven in a broad sense by the motor 18.
  • the driving force acquisition unit (20) that acquires the driving force (F) of the motor (18) that drives the movable member, and the driving force of the motor includes a pressure control unit (48) that controls the pressure adjustment unit to adjust the pressure of the compressed fluid supplied to the support member.
  • the pressure control unit controls the pressure adjustment unit so that the pressure of the compressed fluid supplied to the support member increases as the driving force of the motor increases. As a result, as the driving force of the motor increases, the rigidity of the support member that supports the movable member can be increased.
  • the pressure adjusting unit includes a plurality of compressed fluid supply paths (40) for supplying the compressed fluid from the fluid supply source to the support member, and the compressed fluid in the plurality of compressed fluid supply paths. It has a pressure adjusting mechanism (42) that adjusts the pressures of the above to be different from each other, and a switching mechanism (44) that is controlled by the pressure control unit and switches the compressed fluid supply path connected to the fluid supply source. .. Thereby, the pressure of the compressed fluid supplied to the hydrostatic bearing can be adjusted by switching the compressed fluid supply path connected to the fluid supply source.
  • the pressure adjusting mechanism has a plurality of throttle valves (46) provided in the plurality of compressed fluid supply paths. Thereby, the pressure of the compressed fluid in the compressed fluid supply path can be adjusted to be different from each other by using a plurality of throttle valves.
  • the pressure adjusting unit has a regulator (54) that is controlled by the pressure control unit and adjusts the pressure of the compressed fluid supplied to the support member. This allows the regulator to adjust the pressure of the compressed fluid supplied to the hydrostatic bearing.
  • a notification control unit (50) for controlling the notification unit (22) is provided, and the notification control unit controls the pressure adjustment unit to control the pressure of the compressed fluid supplied to the support member.
  • the notification unit is controlled to notify the operator that the pressure of the compressed fluid supplied to the support member is being adjusted. This allows the operator to know that the pressure of the compressed fluid supplied to the support member is being adjusted.
  • the notification control unit notifies the operator that the adjustment of the pressure of the compressed fluid supplied to the support member is completed after notifying that the adjustment is in progress. This allows the operator to know that the adjustment is complete.
  • the notification control unit supplies the pressure control unit to the support member when a predetermined time elapses from the start of pressure adjustment of the compressed fluid supplied to the support member by controlling the pressure adjustment unit. It is determined that the adjustment of the pressure of the compressed fluid is completed. As a result, the notification control unit can determine the completion of adjustment without using the pressure detector.
  • a pressure detection unit (52) for detecting the pressure of the compressed fluid supplied to the support member is provided, and the notification control unit is supplied to the support member based on the detection signal of the pressure detection unit. It is determined whether or not the pressure adjustment of the compressed fluid is completed. This makes it possible to improve the certainty of the determination of the completion of adjustment by using the pressure detector.
  • the notification unit is a speaker, and the notification control unit outputs the sound of the first aspect from the notification unit when the pressure of the compressed fluid supplied to the support member is being adjusted.
  • the sound of the second aspect different from the first aspect is output from the notification unit. Thereby, the operator can grasp the progress until the completion of the adjustment by the sound of the first aspect and the sound of the second aspect.
  • the notification unit is a speaker, and the notification control unit outputs a sound of a third aspect different from the sound of the first aspect from the notification unit, so that the sound is supplied to the support member from now on. Notify the operator that the pressure adjustment of the compressed fluid will start. Thereby, the operator can grasp the progress from the start of the adjustment by the sound of the first aspect and the sound of the third aspect.
  • the support member is a hydrostatic bearing that rotatably or slidably supports the movable member using the compressible fluid. This allows the static pressure bearing to rotatably or slideably support the movable member.
  • the compressed fluid supply system is a machine tool, and the machine tool includes a spindle (12) having the movable member. As a result, the rigidity of the spindle can be adjusted according to the driving force of the motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
PCT/JP2021/026062 2020-07-17 2021-07-12 圧縮流体供給システム Ceased WO2022014510A1 (ja)

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CN202180060048.XA CN116157229A (zh) 2020-07-17 2021-07-12 压缩流体供给系统
DE112021003833.8T DE112021003833T5 (de) 2020-07-17 2021-07-12 Druckfluidversorgungssystem
JP2022536336A JPWO2022014510A1 (enExample) 2020-07-17 2021-07-12
US18/016,163 US20230271283A1 (en) 2020-07-17 2021-07-12 Compressed fluid supply system

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JP2020-122822 2020-07-17
JP2020122822 2020-07-17

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JP2000002243A (ja) * 1998-06-16 2000-01-07 Ntn Corp 静圧空気軸受装置
JP2002005169A (ja) * 2000-06-21 2002-01-09 Toyoda Mach Works Ltd 流体軸受装置

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JP2000002243A (ja) * 1998-06-16 2000-01-07 Ntn Corp 静圧空気軸受装置
JP2002005169A (ja) * 2000-06-21 2002-01-09 Toyoda Mach Works Ltd 流体軸受装置

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CN116157229A (zh) 2023-05-23
DE112021003833T5 (de) 2023-05-04
US20230271283A1 (en) 2023-08-31

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