JP2007038390A - Centrifugal force balancing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a machining tool sliding on a rotary face plate from being decreased in feed force given to a moving bed loaded with a fitting tool or fastening force by the centrifugal force, and to continuously generate force against the centrifugal force even if the rotational frequency and the center of gravity of the moving bed vary from the center of rotation. <P>SOLUTION: A cylinder 8 is fitted to a machining tool sliding on the rotating face plate 3 or the moving bed loaded with a fitting tool, and the centrifugal force changing with passage of time is calculated taking the weight of the moving bed, the distance from the center of gravity of the moving bed to the center of rotation and the rotational frequency of the face plate as parameters, and the force depending on a balance cylinder resisting the generated centrifugal force is generated by continuously controlling the voltage or current designating the pressure by a pressure reducing valve 12 with a proportional electromagnetic force relief. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

Detailed Description of the Invention

  The present invention relates to a rotating face plate device, and more particularly, to a rotating device related to a moving table equipped with a processing tool or fixture that slides on a face plate in a centripetal direction or a centrifugal direction.

  Conventionally, in order to counter the centrifugal force, the capacity of the feeding device or the fixture device is increased in advance, and the remaining force against the centrifugal force is used as the feeding force or the clamping force.

Problems to be solved by the invention

1. When machining or tightening in the centripetal direction with the moving table rotating around the center of the face plate, the machining force or tightening force decreases due to centrifugal force, and only the remaining force is used.
In order to prevent this, the cylinder device is attached separately from the force that opposes the centrifugal force to prevent the feed force or tightening force from being lowered.
2. Even if the weight of the moving body is known, the distance between the center of gravity of the moving base and the center of rotation, and the number of rotations of the face plate change, and the centrifugal force increases or decreases, a force against the centrifugal force is continuously applied.

Means for solving the problem

In order to achieve the object, the present invention has the following configuration as means for solving the problem. In a device in which a moving table equipped with a processing tool or mounting tool slides in a centripetal direction or a centrifugal direction on a face plate attached to the rotating spindle end face, a cylinder is arranged in the centrifugal direction, and centrifugal force and In order to generate a force that can be countered, a fluid having a continuous pressure is sent into the cylinder, and a force that prevents the centrifugal force from reducing the feed force of the moving table or the tightening force of the fixture is generated.
As an example of this situation, the rack-equipped moving base 8 is driven by the gears 4, 5, 6, and the small gear 7 driven by the feed transmission shaft 2 on the face plate 3 attached to the end surface of the rotating main shaft 1. When sliding in the centripetal direction and the centrifugal direction, centrifugal force is generated while changing.
At that time, in order to obtain a pressure P that continuously changes the force that opposes the centrifugal force F that fluctuates the hydraulic pressure supplied from the hydraulic pump 14 to the piston 10 fixed to the face plate 3, a proportional electromagnetic relief The hydraulic pressure that controls the attached pressure reducing valve is pressurized from the rotary joint 11 to the moving table 8 containing the cylinder through the piston 10 to generate a force against the centrifugal force.
Further, since the centrifugal force changes depending on the relationship between the face plate rotation speed N and the distance L from the face plate rotation center to the center of gravity of the moving table, the following formula is used to calculate the pressure reducing valve 12 with proportional electromagnetic relief continuously. The control voltage 19 is controlled.
Control pressure Pkgf / cm ² is centrifugal force Fkgf, moving table weight Wkgf, distance Lcm from face plate rotation center to moving table center of gravity, angular velocity ω rad / sec, gravity g = 980 cm / sec ² , cylinder area Acm ² centrifugal force F = As W · L · ω ² / g, P = F / A, it can be obtained as the control pressure Pkgf / cm ² .
When the position of the moving base or the rotation speed of the face plate changes with time, the control pressure P is always changed by instructing the control voltage or the control current by the above formula, and the force that opposes the centrifugal force. Is generated.

Centrifugal force is generated when a moving table equipped with a sliding tool is rotated in the centrifugal and centripetal directions. Since the centrifugal force is received by the balance cylinder, the original feed force or mounting force can be used sufficiently without being affected by the centrifugal force. When used as a processing force, stable processing force and acceleration can be obtained, which is good. Processing shape and surface roughness can be obtained.
Since centrifugal force does not act on the feeding device or the like, the strength is improved in rigidity and the life of the device is extended.

The invention's effect

According to the present invention, the following effects can be obtained by eliminating the influence of centrifugal force from the feeding device or the fixture by the structure as described above.
1. The feed force or mounting force is not affected by the rotational speed or the centrifugal force at the mounting position, the rigidity is increased, and the processing force and processing accuracy are improved.
2. The processing force is not reduced by the centrifugal force, the processing conditions can be improved, and the productivity can be increased.
3. Depending on the balance cylinder force against the centrifugal force, it is possible to increase the size of the feeding device and the tool, so that the processed product can be increased in size and applied to products in new fields.
4). In the feed device, the acceleration force and the feed force in servo control and the like are not wasted, and the device capacity can be reduced.
5. Since the capacity of the apparatus can be reduced, related members and the like can be reduced, and the machine price can be reduced.
6). A device that counteracts the centrifugal force can be an inexpensive device or an inexpensive device, and the machine price can be reduced.
7). The useless force of centrifugal force is eliminated and the life of the device is extended.

  Cross-sectional top view of balance cylinder in face plate moving table feeder   Front view of the moving plate feeder in the face plate   Cross-sectional side view of the feeder cross section in the face plate moving table feeder   Hydraulic circuit diagram for counteracting centrifugal force

Explanation of symbols

1. Spindle 2. 2. Transmission shaft for feeding Face plate Sun gear 5. Intermediate gear a
6). Intermediate gear b
7). Small gear 8. Moving base (cylinder)
9. 10. Holding plate for moving table Piston (for counteracting centrifugal force)
11. Rotating joint 12. Pressure reducing valve with proportional electromagnetic relief 13. Relief valve 14. Hydraulic pump 15. Filter 16. Electric motor 17. Tank 18. Pressure gauge 19. A control voltage or control current that indicates the cylinder pressure to counteract the centrifugal force generated by W, L, N (when no amplifier is attached)
CW. Clockwise rotation CCW. Counterclockwise rotation Moving table weight: kgf
N. Number of revolutions per minute of face plate: rpm
L. Distance from center of rotation of face plate to center of gravity of moving table: cm
D. Cylinder diameter: cm
g. Gravity: 980 cm / sec ²
π. Circumference ratio: 3.14159
P. Control pressure: kgf / cm ²
F. Centrifugal force: kgf
ω. Angular velocity: ω = 2π · N / 60: rad / sec
A. Cylinder ^{area: A = π · D 2/} 4: cm 2

Claims (1)

In a device equipped with a moving tool that mounts a processing tool or mounting tool on a rotating face plate, the processing force or tightening force that acts in the direction of the center of rotation is reduced by the centrifugal force generated by the rotation. To do. In order to eliminate this state, it is a device that continuously applies the opposing force to the fluctuating centrifugal force generated depending on the changing distance from the center of gravity of the moving base to the center of rotation and the changing speed of the face plate. .

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