JPH084174Y2 - Rotation deskewer - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a rotary die which is a lower die of a punching press for punching a steel plate to manufacture a rotor laminated iron core of a rotating machine such as an electric motor or a generator. The present invention relates to a rotation deskew device that intermittently rotates and deskews.

[Prior Art] When manufacturing a laminated iron core used in a rotor of a rotating machine such as an electric motor or a generator, a progressive die unit is used to punch a silicon steel plate or the like into a circle, and a predetermined number of punched steel plates are used. I'm trying to stack them.

Here, if the steel sheets are punched out in a round shape and simply laminated, the product thickness becomes non-uniform in each part due to the thickness deviation during rolling of the steel sheet, and the parallelism of the upper and lower surfaces and the runout accuracy of the inner and outer diameters become poor.

For this reason, conventionally, when punching steel plates, the deviation of the plate thickness is eliminated by laminating the plates by rotating them by 90 ° or 180 ° for each predetermined number of sheets (one or more), and at the same time, the dynamic balance of the rotor is eliminated. It also improved the accuracy of the shaft hole and the accuracy of the outer diameter runout.

Further, if the punched steel plates are rotated by a predetermined angle and laminated straightly, sufficient electric characteristics cannot be obtained. Therefore, in order to further improve the electric characteristics, the iron core to be laminated in addition to the above rotation is The so-called skew is removed by rotating each sheet by a predetermined minute angle.

Due to such rotation and skew, for example, a die rotating device that rotates and skews the lower die of the press die by a servomotor and a lower die of the press die are rotated and rotated by using the frictional force of the disc. A mold rotating device (USP No. 4723360) for skewing has been proposed.

[Problems to be solved by the invention] However, the former mold rotating device has a maximum punching speed.
Since it is about 450 spm, high-speed punching is difficult, the index accuracy of the motor is poor at about ± 5 ', and moreover, the reduction ratio cannot be increased, so the skew accuracy is poor.

In addition, the latter mold rotating device uses a drive system that uses the frictional force of the disc (friction pulley) to achieve a load of 5 kgf · m.
It is difficult to transmit a torque that exceeds the limit, and since it is necessary to replace the disk to change the skew angle, it takes time to convert the disk, and more disks must be owned. It was

It is an object of the present invention to provide a rotation skew removing device that has high accuracy of rotation and skew and that can easily set and change the skew angle.

[Means for Achieving the Problem] A rotary skew removing device according to the present invention synchronizes a lower rotary die of a punching press with a stroke of a crankshaft of a press machine, and a predetermined period of the stroke of the crankshaft. The rotation driving means for rotating a by a predetermined angle in the range of 45 ° to 180 ° and the braking force on the rotary die within the predetermined period a in synchronization with the stroke of the crankshaft. In addition to the braking means for stopping the rotation in the predetermined period a and the stroke of the crankshaft, the rotary die is added to the predetermined angle in a predetermined period b of the stroke of the crankshaft following the predetermined period a to obtain 1 The above problem is solved by a skew removing means for further rotating by a predetermined minute angle of not more than °.

[Operation] In this invention, when the rotary drive means is driven for a predetermined period a of the stroke of the crankshaft of the press machine, the rotary die of the punching press rotates a predetermined angle in the range of 45 ° to 180 ° for the predetermined period a. Then, when the braking means is activated within the predetermined period a, the braking force acts on the rotary die to stop the rotation of the rotary die for the predetermined period a, and the stroke of the crankshaft following the predetermined period a is predetermined. When the skew removing means is driven in the period b, the rotary die further rotates by a predetermined minute angle of 1 ° or less in addition to the predetermined angle.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

First, the rotation driving means for rotating the rotary die of the punching press by a predetermined angle will be described.

In FIG. 1, reference numeral 2 is a cam index, and an input shaft 4 is provided on the side surface of the cam index, and an output shaft 6 is provided on the upper surface so as to project.

The input shaft 4 of the cam index 2 is connected to the crank shaft (not shown) of the press machine via the electromagnetic clutch 8 and the couplings 10a and 10b, and when the input shaft 4 is rotated by the crank shaft, the input shaft 4 is rotated for a predetermined period. a (see FIG. 5), the output shaft 6 is adapted to perform intermittent rotation in the direction indicated by arrow A by a predetermined angle α. The predetermined angle α can be selected from 180 °, 120 °, 90 °, 60 °, 45 °, etc. by setting.

A pulley 12 is attached to the output shaft 6 of the cam index 2, and this pulley is connected to a pulley 18 of a rotary die 16 via a timing belt 14.

The pulley 18 is a one-way clutch as shown in FIG.
It is coaxially attached to the rotary die 16 via 20 and the rotational force of the pulley 18 is transmitted by the one-way clutch 20 only in the direction indicated by the arrow B which is the same direction as the arrow A.

Pulley provided on the output shaft 6 of the cam index 2
The number of teeth of 12 and the number of teeth of the pulley 18 provided on the rotary die 16 are
The ratio is 1: 1. Therefore, when the pulley 12 rotates by the predetermined angle α, the pulley 18, that is, the rotary die 16 also rotates by the predetermined angle α.

Next, the overrun rotation of the rotary die 16 by the rotary drive means (the rotation of the pulley 12 is reduced
The braking means for holding 16 rotating before the pulley 12 is described.

In FIG. 1, 38 is an electromagnetic brake, and a pulley 42 is fixed to the end of a rotary shaft 40 of this electromagnetic brake 38 (see FIG. 3). A pulley 44 is coaxially fixed to the rotary die 16 with a key 46. The pulley 42 of the electromagnetic brake 38 is connected to the rotary die 16 and the pulley 44 via a timing belt 48.

The electromagnetic brake 38 is provided with a drive means 50, and the control means 36 receives a signal from the stroke detection means 32 to control the drive means 50. The braking force of the electromagnetic brake 38 can be easily adjusted by controlling the voltage applied to the brake coil.

Next, a skew removing means for rotating the rotary die by a predetermined minute angle will be described.

In FIG. 2, reference numeral 22 is a worm wheel, and this worm wheel 22 is coaxially attached to the rotary die 16 via a one-way clutch 24, and the rotational force of the worm wheel 22 is also directed in the direction indicated by the arrow B by the one-way clutch 24. It is only transmitted.

A worm 26 that rotates in a direction indicated by an arrow C meshes with teeth on the outer periphery of the worm wheel 22, and a rotation shaft 28 of the worm 26 is connected to a rotation shaft of a stepping motor 30.

The stepping motor 30 is controlled so as to rotate by a constant angle in synchronization with the stroke of the press machine. That is, as shown in FIG. 4, the crankshaft of the press machine is provided with stroke detection means 32, the stepping motor 30 is provided with drive means 34, and the control means 36 is a signal from the stroke detection means 32. Is received to control the driving means 34.

Pulley rotated by cam index 2
18 is in charge of rotation, the worm wheel 22 rotated by the stepping motor 30 is in charge of skew removal, and the rotation angle of the pulley 18 is 360 ° / M (M is 3 to 8).
The rotation angle of the worm wheel 22 is as small as 1 ° or less.

The rotation deskewer configured as described above operates as follows.

First, the input shaft 4 of the cam index 2 rotates every stroke or every N strokes (N is an integer of 2 or more) in synchronization with the rotation of a crankshaft (not shown) of the press machine, and the rotary die 16 Will intermittently rotate by a constant angle only in the direction indicated by arrow B in synchronization with the stroke of the press machine.

When the stepping motor 30 rotates, the rotary die 16
Will rotate intermittently by a constant small angle only in the direction indicated by arrow B.

The state of these rotations is shown in the time chart of FIG.

Where a is the rotation period of the pulley 18, b is the skew removal period, c is the meshing period, and the rotation period a is 180
°, skew removal period b is about 125 °, meshing period c is 2
0 °.

 Next, consider the rotation of the pulley 12.

FIGS. 6A to 6E are charts for the rotation of the pulley 12 and the like.

The dynamic torque of the rotary die 16 shown in FIG. 6 (d) is proportional to the acceleration A shown in FIG. 6 (b).

From FIGS. 6 (a) and 6 (b), deceleration torque is generated between 315 ° and 45 °.
The 16 rotates ahead of the pulley 12. That is, it can be seen that the overrun rotation is being performed.

In order to prevent this overrun rotation, it is necessary to apply some brake to the rotary die 16 during the period when the deceleration torque is generated.

This brake is applied by the electromagnetic brake 38.

If the electromagnetic brake 38 having the braking force shown in FIG. 6 (c) is applied, the combined torque of FIGS. 6 (c) and 6 (d) becomes as shown in FIG. 6 (e), and the negative torque Will not occur and overrun rotation will be prevented.

In this example, the electromagnetic brake 38 is not applied during the skew removal period b by the stepping motor 30, but this is because the rotation angle is small in the skew removal, so the overrun rotation is about the torque when the one-way clutch 20 is idling. This is because is pressed.

[Effects of the Invention] As described above, the skew removal in this invention is significantly reduced by the worm, so it is greatly improved as compared with the skew removal by the motor that cannot obtain a sufficient reduction gear ratio, and the skew accuracy is improved. It has the effect of improving.

Further, in the present invention, there is no need to change the skew removing angle by exchanging the disk, and the skew amount can be changed only by changing the setting of the skew removing means. This has the effect of facilitating changes.

Further, in this invention, the rotation (large angle) is handled by the rotation driving means and the skew removal (minute angle) is handled by the skew removal means, so that there is an effect that high-speed correspondence can be realized.

[Brief description of drawings]

1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG. Is a circuit block diagram showing an embodiment of the present invention, FIG. 5 is a time chart diagram for rotation and skew removal, and FIG. 6 is a chart diagram for rotation of the pulley 12 and the like. 2 ... Cam index, 4 ... Input shaft, 6 ... Output shaft, 8 ... Electromagnetic clutch, 10 ... Coupling, 12 ...
Pulley, 14 …… Timing belt, 16 …… Rotating die,
18 …… Pulley, 20 …… One way clutch, 22 …… Worm wheel, 24 …… One way clutch, 26 …… Worm, 28 …… Rotating shaft, 30 …… Stepping motor, 32
...... Stroke detecting means, 34 ...... driving means, 36 ...... control means, 38 ...... electromagnetic brake, 40 ...... rotating shaft, 42 ...... pulley, 44 ...... pulley, 46 ...... key, 48 ...... timing belt , 50 …… Driving means.

Claims (1)

[Scope of utility model registration request] 1. A lower rotary die of a punching press is synchronized with a stroke of a crankshaft of a press machine, and is rotated by a predetermined angle within a range of 45 ° to 180 ° during a predetermined period a of the stroke of the crankshaft. Rotation driving means for causing the rotation of the crankshaft, braking means for applying a braking force to the rotary die within the predetermined period a to stop the rotation of the rotary die within the predetermined period a in synchronization with the stroke of the crankshaft, In synchronization with the stroke of the crankshaft, a skew removing means for further rotating the rotary die by a predetermined minute angle of 1 ° or less in addition to the predetermined angle during a predetermined period b of the stroke of the crankshaft following the predetermined period a. And a rotary skew removing device having.