JP4936065B2 - Tire wheel vibration isolating method and apparatus for tire wheel holding chuck - Google Patents

Description

  The present invention relates to a tire wheel vibration isolation method and apparatus for a tire wheel holding chuck that prevents vibration of a tire wheel that occurs during processing.

Conventionally, a tire wheel holding chuck is provided with a damper holding member that can move in the chuck axis direction on the chuck body, and the damper holding member is positioned on a circumference centered on the chuck axis line, and the damper pin is chucked by a spring from the damper case. A plurality of vibration damping dampers protruding forward in the axial direction are provided. The tire wheel is held in a state where the axial direction of the tire wheel is positioned on the chuck body, and the damper pin of the damper is elastically pressed to the rim end of the tire wheel to prevent the tire wheel from being vibrated during processing by the damper pin. It is supposed to be.
In Patent Document 1, a damper holding member provided with a damper can be moved in the chuck axial direction by a pneumatic cylinder, the tire wheel is held in a state where the axial direction of the tire wheel is positioned on the chuck body, and then the rear cylinder chamber is previously stored. By moving the damper holding member that has been lowered to the standby position by its own weight due to its own weight due to the air pressure supplied to the rear cylinder chamber, the corresponding damper pin is brought into contact with the rim end, The damper holding member is moved while compressing the spring, and the tip of the damper pin and the damper case is brought into contact with the rim end.
Japanese Patent No. 3906922

In the above, the damper holding member that has been lowered to the standby position is moved upward, the damper pin of the damper corresponding to the rim end of the tire wheel is brought into contact, and the tip of the damper case is rimmed while compressing the spring. It is made to contact the end. However, when the damper holding member is moved upward by the force of compressing the spring by the damper pin, there is a possibility that a scratch or a dent may be caused by an impact when the rim end receives the force. Further, since the standby position is a position where the damper and the rim end do not interfere with each other, the damper holding member is more than the damper pin stroke after the tire wheel is grasped and before the tip of the damper case of the damper is brought into contact with the rim end. There is a possibility that it takes time to process the tire wheel.
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a tire wheel holding vibration damping method for a tire wheel holding chuck in which a damper is brought into contact with a rim end without giving an impact, and the operation can be performed in a short time. An object of the present invention is to provide an apparatus.

  In the present invention, the damper holding member is moved forward in the chuck axis direction, and the damper holding member can be moved rearward in the chuck axis direction with a force that does not compress the spring by the damper pin, and the chuck wheel axis direction of the tire wheel is positioned. When the tire wheel is held, the rim end of the tire wheel is brought into contact with the damper pins of the plurality of dampers, the damper holding member is moved rearward in the chuck axis direction via the spring, and after holding the tire wheel, the damper holding member is The spring is moved forward in the chuck axis direction by a force for compressing the spring, the spring is compressed by the stroke of the damper pin, and the damper case is brought into contact with the rim end of the tire wheel.

  In the present invention, the longitudinal direction of the chuck axis of the chuck body is the vertical direction, the damper holding member can be moved in the vertical direction by fluid pressure, and the damper holding member is moved upward by low pressure fluid pressure that does not compress the damper spring. When the tire wheel is moved and positioned in the vertical direction, the rim end of the tire wheel is brought into contact with the damper pins of the plurality of dampers, and the damper holding member is resisted against the low pressure fluid pressure via the spring. After moving down and holding the tire wheel, the damper holding member is moved upward by the high pressure fluid pressure that compresses the spring of the damper, and the spring is compressed by the stroke of the damper pin, and the damper case is moved to the rim end of the tire wheel. It makes it contact | abut.

  Furthermore, the present invention is provided with a switching device capable of switching the fluid pressure supplied to the fluid pressure cylinder between a low pressure and a high pressure in the fluid pressure circuit of the fluid pressure cylinder capable of moving the damper holding member in the chuck axis direction, This is characterized in that it can be selectively moved by a low-pressure fluid pressure that does not compress the damper spring forward and a high-pressure fluid pressure that compresses the damper spring.

  In the present invention, the damper holding member is provided so as to be movable in the chuck axis direction by the fluid pressure cylinder, and the fluid pressure supplied to the fluid pressure cylinder is switched between the low pressure and the high pressure, so that the damper is held at a low fluid pressure. The member is moved, and the rim end of the tire wheel is brought into contact with the damper pins of the corresponding dampers until the center boss portion of the tire wheel comes into contact with the stopper, and the damper holding member is resisted against the low pressure fluid pressure through the spring. Then, the damper holding member is moved so that the fluid pressure is switched from low pressure to high pressure and the spring is compressed by the stroke of the damper pin so that the damper case contacts the rim end of the tire wheel. It is possible to move upward in the chuck axis direction, and the damper pin is in contact with the rim end of the tire wheel Since the abutting the damper case to the rim edge from, it is possible to prevent without damper pin to the rim edge as in the prior art shock at the time of contact, scratches and dents by an impact occurs. In addition, if the spring is compressed by the stroke of the damper pin, the damper case abuts on the rim of the tire wheel, so that the movement distance of the damper holding member is longer than when moving from the standby position to the rim end as in the prior art. This shortens the time required for processing the tire wheel.

  The chuck body 2 of the chuck 1 shown in FIGS. 1 and 2 has a front body 5 integrally fixed to the front end of the rear body 4 by means of mounting bolts 3. A plurality of (three) master jaws 6 are mounted on the front body 5 so as to move in the radial direction at equal intervals in the circumferential direction, and are wedge-engaged with the wedge plunger 7 as is well known. A draw bolt 8 is coupled to the wedge plunger 7, and the wedge plunger 7 is advanced and retracted in the chuck axis L direction by a rotating cylinder (not shown) connected to the draw bolt 8. The master jaw 6 moves in the radial direction of the chuck as the wedge plunger 7 advances and retreats, and the center hole Wa of the aluminum tire wheel W, which is a workpiece, is grasped by the grasping claw 9 attached to the front side of the master jaw 6 and centered and held. It is supposed to be. The grasping claw 9 is attached with a stopper 10 that contacts the central boss portion of the tire wheel W and positions the tire wheel W in the axial direction.

  A damper holding member 11 is fitted on the outer periphery of the rear body 4 of the chuck body 2 so as to be movable in the chuck axis L direction. The damper holding member 11 is obtained by attaching a damper plate 13 to a ring-shaped base 12. In the damper plate 13, a plurality of vibration damping dampers 14 are arranged on the circumference around the chuck axis L corresponding to the tire wheels W having different wheel diameters WL. The vibration damper 14 will be described. An anti-vibration damper 14 shown in FIG. 3 is provided in a damper case 16 integrally fixed to the damper plate 13 via a nut 15 and a stepped through hole 17 of the damper case 16. The damper pin 18 mounted so as to be able to advance and retreat in the chuck axis direction, the closing member 19 for closing the axial rear end opening of the damper case 16, and the urging member interposed between the damper pin 18 and the closing member 19 are exemplified. A spring 20 is provided. The damper pin 18 is always urged in the protruding direction by the spring force of the spring 20. Normally, the large diameter portion 18 a of the damper pin 18 abuts on the step portion of the stepped through hole 17, and the tip of the damper pin 18 is the tip of the damper case 16. Projects forward from the surface. In the present embodiment, the damper pin 18 is urged by the spring 20, but the damper pin 18 may be urged by gas pressure.

  The rear body 4 of the chuck body 2 is provided with pneumatic cylinders 21 exemplified as a plurality (three) of fluid pressure cylinders at equal intervals in the circumferential direction at a position behind the damper plate 13 in the axial direction. Yes. Each pneumatic cylinder 21 has a piston 24 movably fitted in a cylinder chamber 23 in a cylinder body 22, and a piston rod 25 integral with the piston 24 is connected to the damper holding member 11 by a bolt 26. The front cylinder chamber 23 a defined by the piston 24 is open to the atmosphere via the communication hole 27. The rear cylinder chamber 23 b communicates with the corresponding flow paths 28 formed in the rear body 4 in the radial direction. Each flow path 28 communicates with a fluid passage 30 at the center of the draw bolt 8 through an annular groove 29 formed in the through hole 4a in the rear wall of the rear body 4 through which the draw bolt 8 for moving the wedge plunger 7 forward and backward passes. Yes. The fluid passage 30 is connected to a first switching valve 32 (for example, a 3-port 2-position valve) through a rotary joint 31. A pneumatic source 35 is connected to the P port 33 of the first switching valve 32 via a switching device 34. The switching device 34 includes two pressure reducing valves 36 a and 36 b and a second switching valve 37. The air pressure from the air pressure source 36 is set to a low pressure or a high pressure by the pressure reducing valves 36 a and 36 b, and any air pressure is set by the second switching valve 37. The first switching valve 32 is supplied to the P port 33.

  Therefore, the pneumatic cylinder 21 supplies either the low pressure or the high pressure to the rear cylinder chamber 23b by the switching device 34 to move the piston rod 25 forward, and the damper holding member 11 connected to the piston rod 25 moves to the chuck axis. It moves forward in the L direction (advance position A). When the air pressure in the rear cylinder chamber 23b is released to the atmosphere, the advanced piston rod 25 moves backward due to the weight of the damper holding member 11, so that the damper holding member 11 moves rearward (rear end position B) in the chuck axis L direction. It is supposed to be. Further, each damper 14 has a damper so that when the piston rod 25 moves forward and the damper holding member 11 moves to the advance position A, the tip of the damper pin 18 is above the rim end Wb of the corresponding tire wheel by the stroke ST. It is attached to the plate 13. When the low-pressure air pressure is supplied to the rear cylinder chamber 23b of the three pneumatic cylinders 21, the damper holding member 11 is moved by a force (low thrust) that does not compress the spring 20 by the damper pin 18 of the damper 14. Is set to Further, when the high-pressure air pressure is supplied to the rear cylinder chamber 23 b of the three pneumatic cylinders 21, the damper holding member 11 is moved by a force (high thrust) that compresses the spring 20 by the damper pin 18 of the damper 14. Is set to

  A case will be described in which the chuck 1 having the above configuration is integrally fixed to the tip of the upwardly rotating main shaft 40 with a mounting bolt 41 and the tire wheel W having a small wheel diameter WL is processed using the chuck 1. As shown in FIG. 4, prior to the workpiece W grasping operation, low pressure air pressure is supplied to the rear cylinder chamber 23b by the switching device 34, and the damper holding member 11 is moved upward (advance position A) in the chuck axis L direction. . Thereafter, as shown in FIG. 5, the tire wheel W to be processed is lowered from above the chuck 1, and a plurality of dampers corresponding to the rim end Wb of the tire wheel W until the central boss portion of the tire wheel W abuts against the stopper 10. The damper holding member 11 is brought into contact with the 14 damper pins 18 and moved downward (intermediate position C) in the direction of the chuck axis L against the low-pressure air pressure via the spring 20. When the draw bolt 8 is moved downward in the chuck axis L direction by a rotating cylinder (not shown) with the central boss portion of the tire wheel W in contact with the stopper 10, the tire wheel is moved by the gripping claw 9 that moves in the chuck radial direction. W is held. Thereafter, as shown in FIG. 1, the switching device 34 switches the air pressure supplied to the rear cylinder chamber 23b from a low pressure to a high pressure.

  Since the air pressure is changed from low pressure to high pressure, a force (high thrust) that compresses the spring 20 from a force (low thrust) that does not compress the spring 20 by the damper pin 18 of the damper 14 is generated. The damper holding member 11 moves from the intermediate position C to the forward position A so that the spring 20 is compressed by the stroke ST and the damper case 16 is brought into contact with the rim end Wb of the tire wheel W. Thereafter, in a state where the damper 14 is elastically pressed against the rim end Wb of the tire wheel W, the main shaft 40 rotates and the tire wheel W is cut. When vibration occurs below the chuck axis L during machining, the vibration is transmitted to the damper holding member 11 through the damper case 16 because the damper case 16 is in contact with the rim end Wb. Since it is larger than the force (high thrust) that compresses the spring 20, it is absorbed by the air pressure in the rear cylinder chamber 23b via the piston rod 25 that can move in the direction of the chuck axis L. Further, when vibration is generated above the chuck axis L, the vibration is absorbed by the damper pin 18 following the rim end Wb by the spring force of the spring 20.

  After the processing is completed, the draw bolt 8 is moved upward in the chuck axis L direction, the holding of the tire wheel W is released, and the processed tire wheel W is removed above the chuck 1. Next, a new tire wheel W is disposed above the chuck 1, and after holding the tire wheel W as described above, the damper 14 is elastically pressed against the rim end Wb of the tire wheel W while the tire wheel W is pressed. Cutting will be performed. Further, even when the tire wheel W1 having a wheel diameter WL1 different from the wheel diameter WL shown in FIG. 2 is processed, after the tire wheel W1 is held as described above, the damper 14 is attached to the rim end Wb1 of the tire wheel W1. Cutting of the tire wheel W1 is performed in a state of being pressed elastically. Accordingly, the damper holding member 11 is provided by the pneumatic cylinder 21 so as to be movable in the chuck axis L direction, and the air pressure supplied to the pneumatic cylinder 21 is switched between the low pressure and the high pressure. Until the center boss portion of the tire wheel W abuts against the stopper 10, the rim end Wb of the tire wheel W abuts against the damper pins 18 of the corresponding dampers 14 and the damper holding member 11 via the spring 20. Is moved downward in the direction of the chuck axis L against the low-pressure air pressure, the air pressure is switched from low pressure to high pressure, the spring 20 is compressed by the stroke ST of the damper pin 18, and the damper case 16 is moved to the rim of the tire wheel W. The damper holding member 11 is moved upward in the chuck axis L direction (advanced so as to contact the end Wb. Since the damper case 16 is brought into contact with the rim end Wb from the state in which the damper pin 18 is brought into contact with the rim end Wb of the tire wheel W, the damper pin is brought into contact with the rim end Wb as in the prior art. There is no impact when 18 abuts, and no scratches or dents due to impact occur.

  Further, if the spring 20 is compressed by the stroke ST of the damper pin 18, the damper case 16 comes into contact with the rim end Wb of the tire wheel W, so that from the standby position (rear end position B) to the rim end Wb as in the prior art. Compared with the movement, the movement distance of the damper holding member 11 is shortened, and the time until the processing of the tire wheel W can be shortened. In the present embodiment, the longitudinal direction of the chuck axis L of the chuck body 1 has been described as the vertical direction. However, when the longitudinal direction is the longitudinal direction, the damper holding member 11 is moved to the advance position A with high-pressure air pressure. Even when the pneumatic pressure supplied to the pneumatic cylinder 21 is released to the atmosphere when the damper holding member 11 is moved rearward by the tire wheel W, the damper holding member 11 is moved to the rear end position by the frictional resistance generated in the piston 24 and the piston rod 25. Since it does not move to B, the low pressure can be made zero, and the switching device 34 can be dispensed with. Furthermore, although the fluid pressure cylinder 21 has been described as a pneumatic cylinder in this embodiment, the damper holding member 11 connected to the piston rod 25 by adjusting the hydraulic pressure supplied to the cylinder chambers 23a and 23b even if a hydraulic cylinder is used. May be moved between the forward position A and the intermediate position C.

It is a figure which shows the chuck | zipper of this invention. It is the II-II sectional view taken on the line of FIG. 1, and is a figure which shows the state which pressed the damper elastically to the rim end. It is a longitudinal cross-sectional view of a damper. It is a figure which shows the state before grasping | ascertaining a workpiece | work. It is a figure which shows the state which the damper holding member moved with the workpiece | work and the workpiece | work was grasped | ascertained with the grasping nail | claw.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chuck 2 Chuck body 11 Damper holding member 14 Anti-vibration damper 16 Damper case 18 Damper pin 20 Spring 21 Pneumatic cylinder 34 Switching device W Tire wheel Wb Rim end ST Stroke L Chuck axis

Claims (3)

The chuck body is provided with a damper holding member that can move in the chuck axis direction. The damper holding member is positioned on a circumference centered on the chuck axis line, and a plurality of damper pins protrude forward in the chuck axis direction by a spring from the damper case. The tire wheel is generated during machining by the damper pin, holding the tire wheel in a state where the axial direction of the tire wheel is positioned on the chuck body, and elastically pressing the damper pin of the damper to the rim end of the tire wheel In the tire wheel vibration isolating method of the tire wheel holding chuck for preventing vibration of the tire wheel, the damper holding member is moved forward in the chuck axial direction, and the damper holding member does not compress the spring by the damper pin in the chuck axial direction. Can be moved to the rear of the tire When positioning and holding the chuck's chuck axis, the tire wheel rim end is brought into contact with the damper pins of a plurality of dampers and the damper holding member is moved rearward in the chuck axis direction via the spring to hold the tire wheel. After that, the damper holding member is moved forward in the chuck axis direction by a force for compressing the damper spring, and the spring is compressed by the stroke of the damper pin to bring the damper case into contact with the rim end of the tire wheel. Tire wheel vibration isolation method for a tire wheel holding chuck. The front and rear direction of the chuck axis of the chuck body is the vertical direction, the damper holding member can be moved in the vertical direction by fluid pressure, and the damper holding member is moved upward by low pressure fluid pressure that does not compress the spring of the damper, and the tire When positioning and holding the wheel in the vertical direction, the rim end of the tire wheel is brought into contact with the damper pins of the plurality of dampers, and the damper holding member is moved downward against the low-pressure fluid pressure via the spring, and the tire After holding the wheel, the damper holding member is moved upward by the high pressure fluid pressure that compresses the spring of the damper, and the spring is compressed by the stroke of the damper pin to bring the damper case into contact with the rim end of the tire wheel. The tire wheel vibration isolating method for a tire wheel holding chuck according to claim 1. The chuck body is provided with a damper holding member that can be moved in the chuck axis direction by a fluid pressure cylinder. The damper holding member is positioned on a circumference centering on the chuck axis line, and the damper pin is moved forward in the chuck axis direction by a spring from the damper case. Tire wheel protection of a tire wheel holding chuck provided with a plurality of protruding vibration damping dampers, wherein the damper pin of the damper is elastically pressed against the rim end of the tire wheel held in an axially positioned state on the chuck body. In the vibration device, the fluid pressure circuit of the fluid pressure cylinder capable of moving the damper holding member in the chuck axial direction is provided with a switching device capable of switching the fluid pressure supplied to the fluid pressure cylinder between low pressure and high pressure, and the damper holding member is chucked Low fluid pressure that does not compress the damper spring forward in the axial direction; High pressure of the fluid pressure and the tire wheel vibration damper tire wheel holding chuck, characterized in that the selectively movable to compress the spring damper.

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