JPH0346236B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a high-speed screw press used for forging and the like.

(Prior art) In conventional screw presses, the screw spindle is directly driven by a low-speed DC motor, and two pairs of disk flywheels are rotated, and the disk flywheels are forced onto the screw spindle. , a method of rotating a screw spindle is used.

In the former case, the efficiency of the motor is extremely low because the motor repeatedly rotates, stops, and reverses the spindle and flywheel, which have a large rotational moment. Furthermore, since startup is repeated, which requires a large amount of current, the current unevenness within the factory increases. Further, since there is a limit to the torque of the motor and a limit to acceleration/deceleration, desirable forging working conditions cannot be achieved.

In the latter case, the contact area between the disc flywheel and the spindle is extremely small, so there is a limit to the transmitted torque, and large accelerations and decelerations are not possible.
Furthermore, since the contact point of the spindle flywheel is located near the center of the disc flywheel where the circumferential speed is low at the start of descent, this is another factor that makes rapid acceleration difficult. Therefore, it is not preferable for forged products where temperature drop is a problem because it takes too much time to slide down.

(Problems to be Solved by the Invention) An object of the present invention is to solve the problems of the prior art, to enable speeding up of the screw press, and to provide an energy-saving screw press.

(Means for solving the invention) A motor with a built-in flywheel and a forward/reverse clutch is used to drive the spindle flywheel in forward and reverse directions, and the torque of the forward/reverse clutch is set appropriately by the pressure of the fluid used or the electromagnet. It can now be set depending on the situation.

The number of revolutions of the spindle flywheel is measured using a tachometer generator, etc., and the normal rotation clutch is disengaged when it is detected that the flywheel has accelerated to a predetermined speed. The flywheel for the spindle is equipped with a pneumatic, hydraulic, or electromagnetic brake so that the spindle can be stopped.

(Embodiments of the Invention) Examples will be described with reference to the drawings. 1,2
and 3 are frames of a high-speed screw press. A motor stator core and coil 4 are fixed to this frame. The stator coil 4 can generate a rotating magnetic field using a three-phase AC power source.

Reference numeral 5 denotes a flywheel, and a rotor core 6 is attached to the outer periphery of the flywheel, and is rotated by the rotating magnetic field generated by the stator coil 4. Therefore, the rotor core and flywheel 5 are rotating at a predetermined number of rotations. A cylinder cover 8, a piston 9, a cylinder 10, a clutch box 11, a friction plate 12, etc. are attached to the flywheel 5 as parts constituting a clutch for normal rotation. Reference numeral 13 denotes a rolling bearing by which the cylinder 10 is rotatably supported with respect to the frame 1.

Now, when compressed fluid is supplied from A, while the fluid is under pressure, the cylinder cover 8 and the cylinder 10
The piston 9 that is stuck moves to the left in the figure,
Push on the friction plate group 12. Therefore, rotational torque is transmitted from the flywheel 5 to the clutch box 11 via the cylinder 10 and the friction plate 12.
The drive shaft 14 instantaneously enters a normal rotation state.

The configuration for reversal is as follows. An inner gear 15 is attached to the flywheel 5, and a planetary gear 16 is attached to the frame 3 via a pin 17 and a bearing 20, so the sun gear 18 rotates in the opposite direction to the flywheel 5. Reference numeral 19 denotes a rolling bearing that rotatably supports the flywheel 5 with respect to the frame 3. 21 is a bearing that rotatably supports the sun gear 18 with respect to the frame 3, 22 is a friction plate, 23 is a clutch box, 24 is a friction plate pressing block, 25 is a piston, and 26 is a cylinder, which constitute a reverse clutch. are doing.

When compressed fluid is supplied from B, the piston 2 that is stuck in the cylinder 26 while the fluid is under pressure
5 moves to the right in the figure and forces the friction plate group 22 through the pressing block 24. Therefore, the friction plate 22 is removed from the inner gear processed into the sun gear 18.
The rotational torque of the reverse rotation is transmitted through the clutch box 2.
3, and the drive shaft 14 instantaneously enters a reverse rotation state. In addition, 27, 28, 2
9 is a rolling bearing.

30 is a spindle flywheel, and the drive shaft 14
A screw spindle 32 is fixed to the opposite end of the drive shaft 14. The screw spindle 32 is rotatably attached to the frame 35 via a bearing 36, and a slide 33 having a nut 37 is fitted into the screw of the screw spindle, and the slide 33 is attached to a side column of the frame 35. It is guided so that it can slide up and down (left and right in the figure). As the screw spindle 32 rotates, the nut 37 and slide 33 slide up and down (left and right in the figure) inside the frame 35. The spindle flywheel 30 is equipped with a tachometer generator or encoder 31 whose rotation is transmitted by a timing belt or a basting roller, and when the spindle flywheel 30 reaches a predetermined rotational speed, fluid pressure is pushed into A is set to 0 to disconnect the friction plate 12 of the normal rotation clutch. Note that 34 is a brake shoe that brakes the spindle flywheel.

(Operation of the invention) When air or other fluid at a predetermined pressure is forced into A according to the forging operation, the drive shaft 14 starts normal rotation, and the spindle flywheel 30 for accumulating work energy is rotated together with the drive shaft 14. Start normal rotation. When the spindle flywheel 30 reaches a predetermined rotational speed, it is pushed into A to reduce the accumulated fluid pressure to zero and disengage the normal rotation clutch. The spindle flywheel 30 rotates the screw spindle 32, and the slide 33 continues to descend (moves to the left in the figure).
When the kinetic energy of the flywheel is completely consumed by the forging process, the slide 33 stops descending (moving to the left in the figure). The friction plate 22 for the reversing clutch is used to reverse the spindle flywheel 30 and raise the slide 33 (move to the right in the figure).

(Effect of the invention) A motor with a built-in flywheel and a forward/reverse clutch is used to drive the spindle flywheel in forward and reverse directions, and the torque of the forward/reverse clutch is determined by appropriately setting the fluid pressure etc. It is now possible to set For example, if you want to lower the speed, reduce the clutch torque. In other words, lower the fluid pressure, lengthen the acceleration time, and increase the precision of the rotational speed of the work flywheel relative to clutch disengagement (if the clutch is disengaged in a short time, the precision of the rotational speed will be poor).
be able to.

In addition, the rotation speed of the spindle flywheel is measured using a tachometer generator, etc., and it is detected that the flywheel has accelerated to a predetermined speed.
I tried to cut the clutch. The flywheel for the spindle is provided with a brake such as a fluid pressure brake, so that the spindle can be stopped.

With this configuration, (1) it becomes possible to increase the speed of the screw press, thereby achieving ideal forging conditions and at the same time increasing productivity. (2)
It has become possible to save energy. (3) The structure can be made more compact.

[Brief explanation of drawings]

The figure is a sectional view of one embodiment of the present invention. In the diagram; 1, 2, 3...frame, 4...
Motor stator and coil, 5... flywheel, 6... rotor core, 7... fluid supply pipe, 8...
... Cylinder cover, 9 ... Piston, 10 ... Cylinder, 11 ... Clutch box, 12 ... Friction plate, 13 ... Rolling bearing, 14 ... Drive shaft, 1
5...Inner gear, 16...Planetary gear, 17...
Pin, 18...sun gear, 19...rolling bearing,
20... Bearing, 21... Bearing, 22... Friction plate, 23... Clutch box, 24... Friction plate pressing block, 25... Piston, 26... Cylinder, 27, 28, 29... Rolling bearing, 30
... spindle flywheel, 31 ... tachometer generator or encoder, 32 ... screw spindle, 33 ... slide, 34 ...
Brake shoe, 35...Frame, 36...Bearing, 37...Nut.

Claims (1)

[Scope of Claims] 1. A screw spindle 32 is connected to a drive shaft 14 of a motor incorporating a flywheel 5 and a forward/reverse clutch via a spindle flywheel 30 with a brake, and the rotation of the spindle flywheel 30 is 1. A drive device for a high-speed screw press, characterized in that a number of detecting devices 31 are provided, and a clutch in the motor is turned on and off according to the speed detected by the detecting device 31. 2. The drive device for a high-speed screw press according to claim 1, wherein the torque of the forward/reverse clutch is set by fluid pressure or an electromagnet. 3. The drive device for a high-speed screw press according to claim 1, wherein the rotation detection device for the spindle flywheel 30 is a tachometer generator or an encoder.