JP2528476B2 - Slow inching device for press - Google Patents

Description

The present invention relates to a slow inching device used for a press machine or a forging roll.

[Prior art]

It is necessary to operate the drive unit at a slow speed (slow inching) when adjusting the press machine type and adjusting the roll position of the forging roll.

[Problems to be solved by the present invention]

So far, in order to perform slow speed operation, a slow inching motor and clutch are provided for operation, speed control is performed by a DC motor, motor power is turned off, and inching operation is performed by using inertia in a place where the rotation speed of the flywheel is slow. The means such as performing is used.

However, in and, the cost was increased due to the addition of each device and the use of the DC motor, and in that, the flywheel speed control was performed manually, so the operability was extremely poor.

Therefore, the present invention provides a press slow inching device that solves the problems of the prior art as described above and can perform fine speed operation with good operability and can suppress the increase in cost due to an additional device to a minimum. The purpose is to do.

[Structure of Invention]

The slow inching device for a press according to the present invention is provided with a flywheel brake for decelerating the flywheel, and a speed controller for detecting the number of rotations of the motor to perform ON / OFF control of the motor and ON / OFF control of the flywheel brake. During low speed operation, the motor speed is monitored against preset upper and lower speed limits, and the speed controller automatically performs deceleration by the flywheel brake and acceleration by energizing the motor. .

〔Example〕

Hereinafter, description will be made with reference to the illustrated embodiment of the present invention. FIG. 1 shows the overall configuration of the embodiment. This drive device has an AC motor 2, and the rotation of the AC motor 2 is V
It is transmitted to the flywheel 5 by the sheave 3 and the V belt 4. The flywheel 5 is connected to a pinion 7 and a gear 9 by a drive shaft 6, and the rotation of the gear 9 is supported by a clutch 8 on a crankshaft 1 supported by bearings 11 and 11.
Transmitted to 0. The rotational movement of the crankshaft 10 is converted into vertical movement of the slide 14 by the connecting rod 13.

Further, a speed controller 1 is provided on the rotating shaft of the AC motor 2, and a flywheel brake 15 and a brake 12 are provided on the flywheel 5 and the crankshaft 10, respectively.

The speed controller 1 has a tachogenerator or the like to measure the number of revolutions of the AC motor, and also presets the number of revolutions during normal operation N _m1 rpm (about 1000 rpm) and the upper limit number of revolutions during slow motion N _m2 rpm. (About 250 rpm) and the lower limit rotation speed N _m3 rpm (100 rpm
The AC motor speed is controlled based on the (degree). That is, the constant speed control is performed so that the motor speed is N _m1 rpm during normal operation. Further, during the low speed operation, an ON / OFF signal is output to the flywheel brake 15 to perform deceleration control, and the AC motor 2 is turned ON / OFF to speed up the control to adjust the rotation speed within the low speed operation range.

With the above configuration, the AC motor 2 is used during normal press operation.
Is N _m1 rpm and slide 14 reciprocates with a stroke of about 40 spm.

Here, if the operation mode is set to a very low speed, the operation of the AC motor 2 is turned off by the speed controller 1, and as shown in the motor speed characteristic diagram of FIG.
15 is turned on and the flywheel 5 is decelerated. Here, when the rotational speed of the AC motor 2 which is interlocked with the inertial rotation of the flywheel 5 becomes N _m2 rpm, the flywheel brake 1
Turn off 5 and rotate flywheel 5 only by inertia.

AC motor speed N _m3 rpm due to operation or friction loss
Then, the AC motor 2 is turned on, and it is operated up to N _m2 rpm and turned off.
And

If the press operation is performed between N _{m2 and} N _m3 rpm, the inching operation can be performed at a fine speed of 10 to 4 spm, which is slower than the stroke number of 40 spm in the normal operation.

When the AC motor 2 is stopped, the motor switch is turned on up to N _m2 spm, and similarly to the above, the rotation speed is controlled by the speed controller 1 between N _{m2 and} N _m3 rpm.

If the number of times of operation of the AC motor increases per hour, the temperature rises and the operation of the thermal relay may cause the operation to be disabled. However, if a series of operations during the mold change is automated, the thermal failure of the motor can be resolved.

〔The invention's effect〕

The embodiment of the slow inching device for a press according to the present invention is as described above, and the following effects can be obtained.

This is a slow inching device for a press, which can operate at a very low speed with good operability and can minimize the cost increase due to an additional device.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram of the embodiment, and FIG. 2 is a rotation characteristic diagram of the motor. 1 ... Speed controller, 2 ... AC motor, 3 ... V sheave, 4 ... V belt, 5 ... Flywheel, 6 ... Drive shaft, 7 ... Pinion, 8 ... Clutch, 9
...... Gear, 10 …… Crankshaft, 11 …… Bearing, 12
...... Brake, 13 ...... Conrod, 14 ...... Slide, 15
...... Flywheel brake.

Claims (1)

(57) [Claims] 1. A flywheel and a drive device for a press machine or forging roll having a motor for driving the flywheel, wherein a flywheel brake for decelerating the flywheel by an operation signal externally input, and a motor for the motor. It is connected and detects the rotation speed of the motor,
When switching from normal operation to slow speed operation, energize the motor.
An operation signal for turning off the flywheel brake and outputting the flywheel brake is output, and the upper limit rotation speed and the lower limit rotation speed during preset low speed operation are compared with the rotation speed of the motor. A press equipped with a speed controller configured to output an operation signal for turning OFF, turn the motor ON when the lower limit rotation speed is reached, and turn OFF the motor when the upper limit rotation speed is reached again. Slow inching device.