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WO2018190532A1 - Système de mandrin à rendement élevé entraîné électriquement destiné à une machine-outil et procédé de fonctionnement d'un tel système de mandrin - Google Patents

Système de mandrin à rendement élevé entraîné électriquement destiné à une machine-outil et procédé de fonctionnement d'un tel système de mandrin Download PDF

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Publication number
WO2018190532A1
WO2018190532A1 PCT/KR2018/003464 KR2018003464W WO2018190532A1 WO 2018190532 A1 WO2018190532 A1 WO 2018190532A1 KR 2018003464 W KR2018003464 W KR 2018003464W WO 2018190532 A1 WO2018190532 A1 WO 2018190532A1
Authority
WO
WIPO (PCT)
Prior art keywords
spindle
clutch
drive
main shaft
unit
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/KR2018/003464
Other languages
English (en)
Korean (ko)
Inventor
장정환
윤용선
구본생
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.)
Khan Workholding Co Ltd
Research Foundation for Industry Academy Cooperation of Dong A University
Original Assignee
Khan Workholding Co Ltd
Research Foundation for Industry Academy Cooperation of Dong A University
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 Khan Workholding Co Ltd, Research Foundation for Industry Academy Cooperation of Dong A University filed Critical Khan Workholding Co Ltd
Publication of WO2018190532A1 publication Critical patent/WO2018190532A1/fr
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
    • 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
    • B23B31/26—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle
    • B23B31/261—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle clamping the end of the toolholder shank
    • B23B31/266—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle clamping the end of the toolholder shank using a threaded spindle
    • 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
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/10—Driving main working members rotary shafts, e.g. working-spindles driven essentially by electrical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/034—Drawbars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
    • B23B2270/48—Measuring or detecting
    • 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
    • B23Q2703/00—Work clamping
    • B23Q2703/02—Work clamping means
    • 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
    • B23Q2705/00—Driving working spindles or feeding members carrying tools or work
    • B23Q2705/005—General aspects of driving arrangements in a lathe, e.g. indexing the spindle, devices for keeping the cutting speed constant, braking or reversing devices

Definitions

  • the present invention relates to a machine tool, and more particularly, to selectively transmit the power of a motor driving a spindle in a lathe for processing a workpiece to a rotation system including a drawbar for driving the chuck using a clutch mechanism and a spindle.
  • the present invention relates to a high efficiency electric drive chucking system of a machine tool and a method of operating the same.
  • a machine tool is composed of a workpiece and a processing tool, when one of them is fixed, the other is rotated to process the shape of the workpiece, which can be divided into a lathe and a mill according to the rotation.
  • the lathe is configured in such a way that the workpiece is rotated while the machining tool is stationary.
  • the lathe is a chuck that fixes the workpiece, a drawbar for driving the chuck, and a drawbar, the chuck, and a spindle for rotating the workpiece. Consists of.
  • the lead screw has the advantage that the initial applied thrust is mechanically maintained even if the power is removed from the motor after the thrust is applied to the draw bar by the friction force generated between the screw surfaces, while the thrust applied to the draw bar by the friction loss is
  • the higher the disadvantage the lower the efficiency of the thrust applied to the draw bar compared to the output torque of the motor.
  • the present invention is to solve the above problems, an object of the present invention is to efficiently transfer the power of the motor to the draw bar using the ball screw, the operation of the shelf after the linear movement of the draw bar by the drive of the ball screw Provides a high efficiency electric drive chucking system and a method of operation of the machine tool that can stably maintain the clamping force applied to the chuck by stably maintaining the restraint state of the spindle until the switching operation in the clutch system is completed. Is in.
  • the main shaft is fixed to the main body of the machine tool;
  • a spindle in the form of a hollow tube rotatably installed about the main shaft in the main shaft;
  • a spindle drive for transmitting a rotational force to the spindle;
  • a drawbar which is installed inside the spindle in such a manner that linear movement in the axial direction with respect to the spindle is possible but relative rotational movement is impossible, such that the draw bar rotates linearly in the axial direction or rotates with the spindle;
  • a screw shaft fixed to a rear end of the draw bar and having a screw groove spirally formed on an outer surface thereof, a carrier configured to surround the outside of the screw shaft, and having a rotational movement by receiving power from the spindle driving unit, and an inner surface of the carrier;
  • a ball screw including a ball receiving groove spirally formed in the screw groove and a plurality of balls accommodated inside the screw groove of the screw shaft;
  • a clutch unit which is installed on the outer surface of the
  • the clutch unit is frictionally coupled to the clutch member which is linearly movable in the axial direction on the outer surface of the spindle but is not capable of relative rotation, and is installed at the rear of the clutch member so as to be in close contact with the spindle drive when the clutch member is retracted.
  • a spring mount member which can be linearly moved in the axial direction with respect to the spindle between the friction member, the front end of the clutch member and the rear end of the main shaft, but cannot be rotated relative to the spindle;
  • the method for operating the electric drive chucking system of the present invention as described above is composed of the following steps.
  • the draw bar can be linearly moved in the axial direction by using a ball screw having a low friction loss, the efficiency of the chucking system can be improved.
  • the spindle motor is constrained by the locking piston when the spindle is switched to the high speed rotation mode of operation. Since the clutch unit operates while the power is applied to the draw bar and the thrust of the draw bar is maintained, switching of the operation mode is made, thereby reducing the clamping force of the workpiece.
  • the present invention provides an effect of preventing the drawbar thrust reduction at the time of switching the operation mode according to the use of the ball screw while improving the efficiency of the entire system using the ball screw.
  • FIG. 1 is a perspective view of an electric drive chucking system according to an embodiment of the present invention.
  • FIG. 2 is a cutaway perspective view of the electric drive chucking system shown in FIG.
  • FIG. 3 is a cross-sectional view of the electric drive chucking system shown in FIG. 1.
  • FIG. 4 is a cross-sectional view showing the configuration of a ball screw of the electric drive chucking system shown in FIG.
  • FIG. 5 is an exploded perspective view showing the configuration of the clutch unit of the electric drive chucking system shown in FIG.
  • 6A and 6B are enlarged cross-sectional views of main parts of the clutch unit illustrated in FIG. 5.
  • FIG. 7 is a cross-sectional view showing an operation example of the chucking operation mode of the electric drive chucking system shown in FIG.
  • FIG. 8 is a cross-sectional view showing an operation example of the spindle operation mode of the electric drive chucking system shown in FIG.
  • an electric drive chucking system includes a main shaft 10 fixed to a main body of a machine tool and a main shaft 10 inside the main shaft 10.
  • Draw bar 30 that rotates with the (20), the ball screw 40 is installed on the rear end of the draw bar 30, and the spindle 20 is installed on the outer surface of the spindle 20 spindle drive unit And a clutch unit coupled to or separated from each other, a locking piston 81 installed to be movable from the spindle 10 toward the spindle 20 to restrain the spindle 20 with respect to the spindle 10, and the locking piston 81.
  • Piston actuator for reciprocating a certain distance with respect to the spindle 10 It consists of including configuration.
  • the main shaft 10 is formed in an empty cylindrical shape is fixed to the main body of the machine tool.
  • a rear cover 11 having a ring shape having an opening through which the rear portion of the spindle 20 passes is fixedly coupled to the rear end of the main shaft 10.
  • On the outer circumferential surface of the rear cover 11 is formed a thread 11a for forward and rearward movement of the ring gear 68 constituting the clutch unit.
  • a chuck C for processing a workpiece is provided outside the front portion of the main shaft 10, and a jaw J for holding the workpiece is movable radially in the chuck C. Is installed.
  • the jaw (J) is connected through the front end of the draw bar 30 and the link member (not shown) to hold or release the workpiece while moving in the radial direction by the forward and backward linear movement of the draw bar (30). .
  • the spindle 20 is in the form of an elongated cylindrical hollow tube, and is rotatably installed about an axis along an axial direction (front and rear direction) in the inner space of the main shaft 10. Between the outer surface of the spindle 20 and the inner surface of the spindle 10, a plurality of spindle bearings 25 rotatably supporting the spindle 20 relative to the spindle 10 is provided.
  • the spindle bearing 25 is supported by a bearing fixing nut 26 (see FIGS. 6A and 6B) which is fixed to the spindle 20.
  • a coupling key 23 for allowing axial movement of the clutch member 61 constituting the clutch unit and restraining relative rotational movement is formed to extend in the axial direction.
  • the plurality of coupling keys 23 are arranged on the outer circumferential surface of the spindle 20 at regular intervals along the circumferential direction.
  • a plurality of spindle key grooves 22 are formed on the inner circumferential surface of the rear end of the spindle 20 so as to allow axial movement of the ball screw 40 and restrain relative rotational movement in the axial direction.
  • the spindle key grooves 22 are arranged at regular intervals along the circumferential direction on the inner circumferential surface of the rear end of the spindle 20.
  • the draw bar 30 has a rear end fitted to the front end of the screw shaft 41 of the ball screw 40 and is fixed so as to linearly move in the front and rear direction inside the spindle 20 together with the screw shaft 41.
  • the draw bar 30 and the screw shaft 41 may be made of an individual body and then used to be combined with each other. Alternatively, the draw bar 30 and the screw shaft 41 may be made in one piece.
  • the draw bar 30 and the screw shaft 41 is shown as a solid cylinder filled with solid, but alternatively is made of a hollow hollow cylinder to push the device and the workpiece to blow the chip during cutting It is possible to configure a device and the like.
  • the ball screw 40 is configured to function to forward and backward the draw bar 30 by receiving the rotational force of the spindle drive.
  • the ball screw 40 is fixed to the rear end of the draw bar 30 to surround the outer side of the screw shaft 41 and the screw shaft 41, the screw groove 41a is formed spirally on the outer peripheral surface
  • a carrier 42 which is installed and rotates by receiving power from the spindle drive, a ball receiving groove 42a spirally formed on an inner surface of the carrier 42, and an inside of the screw groove 41a of the screw shaft 41. It includes a plurality of balls (43) accommodated in (see Fig. 4).
  • a spindle key 41b into which the spindle key groove 22 formed on the inner surface of the rear end of the spindle 20 is linearly movable in the front-rear direction. Accordingly, the screw shaft 41 can linearly move in the front-rear direction with respect to the spindle 20 but does not have a relative rotational movement.
  • the carrier 42 has a cylindrical shape with both ends open, and is fixed to the pulley cover 52 constituting the spindle drive, so that the carrier 42 is rotated with respect to the screw shaft 41 by receiving a rotational force through the pulley cover 52. do.
  • the ball receiving groove 42a in which the ball 43 is accommodated is spirally formed along the front and rear direction on the inner surface of the carrier 42, so that when the carrier 42 rotates, the ball 43 of the carrier 42 is rotated. Since the rolling motion along the ball groove (42a) and the screw groove (41a) of the screw shaft 41, the screw shaft 41 is linear movement in the front and rear direction with respect to the spindle (20).
  • a sensor capable of detecting a transfer position of the screw shaft 41 may be attached to the rear of the carrier 42.
  • the spindle drive unit is provided with a spindle motor (not shown) installed outside of the main shaft 10 and rotatably installed relative to the spindle 20 outside the spindle 20 to transfer power from the spindle motor. It includes a drive pulley 51 that rotates by receiving, and a pulley cover 52 connecting the drive pulley 51 and the carrier 42 of the ball screw 40.
  • the driving pulley 51 is coupled to or separated from the clutch member 61 of the clutch unit.
  • the drive pulley 51 is connected to the spindle motor (not shown) through a power transmission means such as a belt (not shown) to receive power and rotate.
  • the pulley cover 52 has a cylindrical tube shape to surround the outer side of the ball screw 40, the front end is coupled to the drive pulley 51 and the rear end is coupled to the carrier 42, the drive pulley 51 The rotational force of the transfer to the carrier 42.
  • the locking piston 81 is installed on one side of the main shaft 10 (upper surface in the drawing) so as to be linearly reciprocated, and one end of the locking groove 24 is formed to be concave on one side of the spindle 20. As it is inserted into it serves to restrain the rotation of the spindle (20).
  • the piston actuator for driving the locking piston 81 consists of a pneumatic cylinder 82 in this embodiment.
  • the pneumatic cylinder 82 is formed of a cylindrical body having a hole in which the locking piston 81 emerges on one surface, and a cylinder cover 83 connected to an external pneumatic line (not shown) on one side of the pneumatic cylinder. It is installed to be fixed inside the main shaft (10).
  • the locking piston 81 when pneumatic pressure is applied to the inside of the pneumatic cylinder 82, the locking piston 81 is moved toward the spindle 20 (downward in the drawing) so that one end of the locking piston 81 is introduced into the locking groove 24 and the spindle
  • the locking piston 81 moves away from the spindle 20 (upward in the drawing) so that one end of the locking piston 81 is locked.
  • the restrained state of the spindle 20 is released from the inside of the groove 24.
  • the clutch unit is installed on the outer surface of the spindle 20 on the outside of the rear end of the main shaft 10 to enable linear movement in the axial direction (forward and backward direction), and the drive pulley of the spindle drive unit according to the forward and backward movement direction ( While being coupled to or separated from 51, the spindle 20 functions to couple or disconnect the spindle 20 to the drive pulley 51 of the spindle drive.
  • the clutch unit may include a clutch member 61 installed on the outer surface of the spindle 20 in the axial direction but not relative to the clutch member, and the clutch member ( 61 is installed at the rear of the clutch and the friction member 62 is in close contact with the spindle drive when the clutch member 61 is reversed, and the spindle between the front of the clutch member 61 and the rear end of the main shaft (10)
  • the spring mounting member 64 is installed to be fixed in the axial direction with respect to the axial direction but cannot be rotated relative to the spring 20, and the spring mounting member 64 is installed on the spring mounting member 64 so as to elastically move backward to the clutch member 61.
  • the clutch member 61 is coupled to the rear of the slide ring 61a and the slide ring 61a provided to slide forward and backward along the outer surface of the spring mount member 64 to support the elastic member 63.
  • a spring disc 61b and a bolt are coupled to the rear of the slide ring 61a to fix the spring disc 61b to the slide ring 61a and to rotate the clutch member through the belt 74 to the encoder pulley 73. It includes a fixing ring (61c) for transmitting to.
  • a plurality of spring support grooves 61e on which the elastic member 63 is inserted and supported on the front surface of the spring disc 61b are arranged at regular intervals along the circumferential direction.
  • the friction members 62 are arranged side by side in the front-rear direction, and are provided with a plurality of driven friction pads 62a which are movable in the front-rear direction with respect to the spindle 20 but are not capable of relative rotation, and the driven friction pad 62a. And a plurality of driving friction pads 62b disposed between the spindles and moving relative to the spindle driving unit, but not rotatable relative to the spindle driving unit.
  • a coupling key 23 formed on the outer surface of the spindle 20 is inserted into the inner circumferential surface of the driven friction pad 62a to form a plurality of coupling key grooves 62c along the circumferential direction.
  • a plurality of spline grooves 62d are formed along the circumferential direction at the outer circumferential portion of the driving friction pad 62b, and a plurality of spline grooves 62d are inserted at the front end of the driving pulley 51 to limit relative rotation.
  • Spline projections 51a are formed along the circumferential direction.
  • the frictional force is increased so that a slip phenomenon between the driving pulley 51 and the friction member 62 may not occur.
  • a driving friction pad 62b in which a relative rotation with respect to the driving pulley 51 is interposed between the driven friction pads 62a in direct contact with the driving pulley 51 a large friction force is generated between the friction pads.
  • the clutch member 61 moves forward to apply a pressing force to the driven friction pad 62a and the driving friction pad 62b to the rear.
  • play occurs between each other so that the driving pulley 51 and the driving friction pad 62b can freely rotate with respect to the spindle 20.
  • a thin leaf spring may be inserted to maintain a constant gap between the driven friction pad 62a and the driving friction pad 62b.
  • the driven friction pad 62a and the driving friction pad 62b may be made of different materials.
  • only one friction pad may be used to generate a fixing force.
  • the elastic member 63 is composed of a plurality of compression coil springs installed in the groove formed on the rear surface of the spring mount member 64 to apply an elastic force to the clutch member 61 in the rear.
  • the spring mount member 64 has a circular ring shape and is disposed between the slide ring 61a and the rear cover 11 of the clutch member 61, and a plurality of coupling keys 23 are inserted into an inner circumferential surface thereof.
  • the inner spline grooves 64b are arranged at regular intervals along the circumferential direction.
  • the spring mount member 64 is moved forward (to the right in the drawing) by the reaction force of the elastic member 63 and is supported in surface contact with the bearing fixing nut 26, the bearing is fixed when the spindle 20 rotates It rotates with the nut 26. Therefore, although the spring mount member 64 is installed to be linearly movable in the axial direction with respect to the spindle 20, the axial position is substantially in contact with the bearing fixing nut 26 by the elastic force of the elastic member 63. Is fixed.
  • the ring gear 68 has a circular ring shape and is installed to move in the front and rear direction while rotating about the rear cover 11 fixed to the main shaft 10.
  • the thread 11a is spirally formed along the front and rear direction on the outer circumferential surface of the rear cover 11, and the lead screw 68b engaging the thread 11a on the inner circumferential surface of the ring gear 68 is the front and rear direction. It is formed spirally along the ring gear 68b by the action between the lead screw (68b) and the thread (11a) to move a predetermined distance in the front and rear direction while rotating about the main shaft (10). Since the forward and backward movement distance of the ring gear 68 is small when the clutch is operated, the ring gear 68 remains engaged with the pinion gear 67 even when the ring gear 68 is moved forward and backward.
  • Traction protrusion 68c coupled to the outer circumferential surface of the clutch member 61 on the rear end of the inner circumferential surface of the ring gear 68 so that the ring gear 68 can be moved while pulling the clutch member 61 forward when the ring gear 68 moves forward. Is formed to protrude radially inward.
  • the clutch drive unit for rotating the ring gear 68 includes a clutch motor 65 provided outside the main shaft 10, a speed reducer 66 that receives power from the clutch motor 65 and decelerates the gear reducer. And a pinion gear 67 which rotates by receiving power from the gear 66 and engages gears 68a formed in the circumferential direction on the outer surface of the ring gear 68 to transmit rotational force to the ring gear 68. Therefore, when the clutch motor 65 is operated, the power of the clutch motor 65 is decelerated through the speed reducer 66 and transmitted to the pinion gear 67 to rotate the pinion gear 67, and the pinion gear 67 is rotated. The ring gear 68 engaged with the) rotates clockwise or counterclockwise.
  • the clutch motor 65 is used as the clutch drive unit, a pneumatic cylinder, a solenoid, or the like can be used in addition to this.
  • the outer side of the clutch unit is connected to the encoder 71 for detecting the position of the spindle 20 by measuring the amount of rotation of the spindle 20, and the clutch member 61 and the encoder 71 of the clutch unit
  • the encoder rotating means for transmitting the rotational force of the clutch member 61 to the encoder 71 when the clutch member 61 rotates with the spindle 20 can be configured.
  • the encoder rotation means is coupled to the outer surface of the clutch member 61 and the fixed ring 61a for rotating together with the clutch member 61, the encoder pulley 73 connected to the shaft of the encoder 71, and A belt 74 is wound around the outer surface of the spindle encoder pulley 72 and the outer surface of the encoder pulley 73 to transmit the rotational force of the spindle encoder pulley 72 to the encoder pulley 73.
  • the operation method of the electric drive chucking system according to an embodiment of the present invention having such a configuration consists of the following steps.
  • (S4) a step in which the clutch unit 61 is operated by operating the clutch unit in a state in which power is applied to the spindle motor and thrust is applied to the screw shaft 41 and the draw bar 30.
  • the position of the spindle is controlled so that the end of the locking piston 81 can be inserted into the locking groove 24 of the spindle 20 in the spindle operation mode.
  • the pneumatic cylinder 82 is applied with pneumatic pressure, the locking piston 81 moves to the inside of the main shaft 10, that is, toward the spindle 20, so that the end of the locking piston 81 is locked to the spindle 20. It is inserted into the groove 24, whereby the spindle 20 is constrained to be unable to rotate relative to the spindle 10.
  • the spindle 20 is constrained to the main shaft 10 by the locking piston 81, the clutch member 61 is applied to the spindle motor (not shown) in a state in which the clutch member 61 is separated from the drive pulley 51, the spindle
  • the power of the spindle motor is transmitted to the drive pulley 51 so that the drive pulley 51 rotates (step S2).
  • the driving friction pad 62b together with the driving pulley 51 rotates around the spindle 20.
  • the rotational force of the driving pulley 51 is transmitted to the carrier 42 of the ball screw 40 through the pulley cover 52, and as the carrier 42 rotates while the spindle 20 is constrained, the screw shaft ( 41) and the draw bar 30 coupled thereto is linearly moved rearward. As the draw bar 30 linearly moves backward with respect to the spindle 20, the jaws J provided in the chuck C are closed, thereby firmly holding the workpiece (step S3). Of course, after the workpiece is finished, the carrier 42 is rotated in the opposite direction by the spindle motor (not shown) so that the screw shaft 41 and the draw bar 30 are advanced in the axial direction. Have J) release the workpiece being held.
  • the spindle 20 is rotated at a high speed to the spindle operation mode in which the workpiece is processed. Switch.
  • the clutch member 61 receives elastic force to the rear by the elastic member 63, the ring gear 68 is pushed to the rear as the ring gear 68 moves to the rear, and the friction member 62 of the driving pulley 51 is moved.
  • the power of the spindle motor (not shown) is turned off (step S5).
  • step S6 when the pneumatic cylinder 82 discharges the pneumatic pressure to the outside to move the locking piston 81 in a direction away from the spindle 20, the end of the locking piston 81 exits the inside of the locking groove 24, the spindle 20 ) Is rotatable (step S6).
  • step S7 when the power is applied to the spindle motor (not shown), the driving pulley 51 rotates, and the spindle 20 is connected to the front surface of the driving pulley 51 through the clutch member 61 coupled with a strong frictional force. The rotational force is transmitted to) so that the workpiece is processed while the spindle 20 rotates at a high speed (step S7).
  • the clutch member 61 and the spindle encoder pulley 72 is rotated so that the encoder pulley 73 is rotated, so that the rotation amount of the spindle 20 is measured in real time to the encoder 71 It becomes possible.
  • the draw bar 30 can be linearly moved in the axial direction by using the ball screw 40 having a low friction loss, the efficiency of the chucking system can be improved.
  • the draw bar 30 when the draw bar 30 is linearly moved by the thrust of the ball screw 40, the workpiece is clamped firmly, and then the locking piston 81 is switched to the high-speed rotation mode of the spindle 20. Power is applied to the spindle motor in a state in which the rotation of the spindle 20 is constrained by the drive, and the clutch member 61 of the clutch unit retreats while the thrust of the draw bar 30 is maintained, thereby switching the operation mode. Therefore, there is an advantage in that the clamping force of the workpiece can be prevented from being lowered.
  • the present invention can be applied to a machine tool industry such as a lathe for processing a work piece.

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

Abstract

La présente invention concerne un système de mandrin à rendement élevé entraîné électriquement destiné à une machine-outil et un procédé de fonctionnement associé, le système permettant à la puissance d'un moteur entraînant une broche dans un tour d'être sélectivement produite, à l'aide d'un outil de type embrayage, à destination d'un système de mise en rotation comprenant une broche et une barre de traction destinée à entraîner un mandrin. Le système de mandrin entraîné électriquement, selon la présente invention, comprend : un arbre principal (10) disposé à demeure sur le corps principal d'une machine-outil ; une broche creuse en forme de tube (20) disposée à l'intérieur de l'arbre principal (10) pouvant tourner par rapport à l'arbre principal (10) ; une unité d'entraînement de broche destinée à produire un couple à destination de la broche (20) ; une barre de traction (30), à l'intérieur de la broche (20), destinée à se déplacer de façon rectiligne dans la direction axiale dans la broche (20) ou à tourner avec la broche (20) ; une vis à billes (40) disposée à l'extrémité arrière de la barre de traction (30) ; une unité embrayage disposée sur la surface extérieure de la broche (20), destinée à relier ou à séparer la broche (20) et l'unité d'entraînement de broche ; un piston de verrouillage (81) destiné à verrouiller la broche (20) à l'arbre principal (10), le piston de verrouillage étant disposé dans l'arbre principal (10) de façon à être mobile vers la broche (20) ; et un actionneur de piston destiné à amener le piston de verrouillage (81) à se déplacer en va-et-vient d'une certaine distance par rapport à l'arbre principal (10).
PCT/KR2018/003464 2017-04-13 2018-03-23 Système de mandrin à rendement élevé entraîné électriquement destiné à une machine-outil et procédé de fonctionnement d'un tel système de mandrin Ceased WO2018190532A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2017-0047939 2017-04-13
KR1020170047939A KR101827434B1 (ko) 2017-04-13 2017-04-13 공작기계의 고효율 전기구동 척킹시스템 및 그 작동방법

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WO2018190532A1 true WO2018190532A1 (fr) 2018-10-18

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PCT/KR2018/003464 Ceased WO2018190532A1 (fr) 2017-04-13 2018-03-23 Système de mandrin à rendement élevé entraîné électriquement destiné à une machine-outil et procédé de fonctionnement d'un tel système de mandrin

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KR (1) KR101827434B1 (fr)
WO (1) WO2018190532A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111390213A (zh) * 2020-04-16 2020-07-10 胡炜凯 一种工件可快速弹出的数控机床卡盘机构
CN114771751A (zh) * 2022-05-26 2022-07-22 山东金冠网具有限公司 一种带有前置延展式拖网装置的水面捕捞渔船

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