JPH05123775A - Continuous blanking method for sheet-like material - Google Patents

Abstract

PURPOSE:To improve productivity and to decrease the torque required for the servo motor of a press machine. CONSTITUTION:A sheet-like material is blanked by the punch member and die member of the press machine. The punch member is driven by the servo motor. The sheet-like material is intermittently fed by a feeder and the parts subjected to blanking of the sheet-like material are successively paid off from the press machine. This paying-off is executed while the speed of the punch and die members is lowered when the punch member and the die member part by nearly as much as the thickness of the sheet-like material after blanking of the sheet-like material. The command speed of the servo motor by a controller falls after rising from 0 and begins to rise again immediately when the speed falls down to 0. Since the command speed falls to 0 only instantaneously, the process time is shortened. The actual speed of the servo motor is not lowered down to 0 and the necessary torque of the servo motor decreases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously punching a sheet-like material used for manufacturing floppy disks.

[0002]

2. Description of the Related Art For example, in a floppy disk manufacturing line, a sheet machine 3 to be a floppy disk is continuously punched by using a press 1 and a feeder 2 as schematically shown in FIGS. Done. The pressing machine 1 punches the sheet-like material 3 by an upper mold member 6 and a lower mold member 7 which are movable in the vertical direction. In addition,
A pad 8 facing the upper surface of the lower mold member 7 is attached to the upper mold member 6 so as to be vertically movable.
Is urged downward by a spring 9. In addition, the lower mold member 7 includes a pad 10 facing the upper surface of the upper mold member 6,
11 are assembled so that they can move up and down, and these pads 1
0 and 11 are urged upward by springs 12 and 13. The upper mold member 6 is driven by the AC servomotor 16, and the output shaft of the servomotor 16
The rotation of 16a is converted into vertical movement by a power transmission mechanism 17 such as a crank mechanism and transmitted to the upper die member 6. On the other hand, the feeder 2 intermittently feeds the sheet-like material 3 by rotating a plurality of rollers 21, 22, 23, 24 sandwiching the sheet-like material 3, and at least one of the rollers 21, 22, The motors 23 and 24 are driven to rotate by a motor (not shown). Further, as shown in FIG. 5, the speed of the servo motor 16 of the press machine 1 is controlled by a driver 27 based on a command signal from a controller 26 including a computer and a feedback signal related to the speed from the servo motor 16. It is something. Further, the controller 26 also sends a command signal to a motor 28 of the feeder 2 via a driver 29.

Next, the operation of the above configuration will be described. In FIG. 6, the rotation angle of the output shaft 16a of the servo motor 16 of the press machine 1 is 0 ° (top dead center), and the upper die member 6 is
Indicates the most elevated state. The lower mold member 7
When the upper mold member 6 is away from the upper mold member 6
And the lower surface of the pad 8 are located on the same horizontal plane, and the upper surface of the lower mold member 7 and the upper surfaces of the pads 10 and 11 are located on the same horizontal plane. And the output shaft 16a of the servo motor 16
Is rotated clockwise in the drawing, the upper mold member 6
Is lowered and the rotation angle of the output shaft 16a of the servo motor 16 is
When it reaches close to 180 °, the upper mold member 6 is fitted into the lower mold member 7, and the sheet-like material 3 is punched out between these mold members 6 and 7. At this time, the pad 8 on the upper die member 6 side is raised by the lower die member 7, while the pads 10 and 11 on the lower die member 7 side are lowered by the upper die member 6, and the sheet being punched out. Press the object 3. Furthermore, as shown in FIG.
After the rotation angle of the output shaft 16a of the servomotor 16 reaches 180 ° (bottom dead center), the upper mold member 6 rises and comes out of the lower mold member 7. When the upper mold member 6 and the lower mold member 7 are separated from each other by the thickness of the sheet-like material 3 or more, the rollers 21, 22,
The sheet-like material 3 is fed for a predetermined length by the rotational driving of 23 and 24, the punched portion of the sheet-like material 3 is discharged from the press machine 1, and the unpunched portion enters the press machine 1. The above steps are repeated, the sheet 2 is intermittently fed by the feeder 2, and the punched portion of the sheet 3 is sequentially dispensed from the press 1.

By the way, in an ordinary press machine, the speed of the motor for driving the upper die member is constant, but in the press machine 1 described above, the process of paying out the sheet-like material 3 is involved,
It is inconvenient that the speed of the servomotor 16 that drives the upper mold member 6 is constant. That is, in order to reliably feed the punched sheet-like material 3, the upper die member 6 and the lower die member 7 are separated from each other with the thickness of the sheet-like material 3 being substantially separated. It is preferable to send. For that purpose, it is necessary to reduce the speed of the servo motor 16 when the upper mold member 6 and the lower mold member 7 are separated from each other in the material thickness of the sheet-like material 3. Therefore, conventionally, the command speed of the servo motor 16 by the controller 26, that is, the command speed set by the program of the controller 26 is made into a triangular wave shape as shown by the solid line in FIG. More specifically, the command speed of the servo motor 16 by the controller 26 is 0
It rises, then falls, then falls to 0, continues to be 0 for a while, and then starts rising again. Note that due to a delay in response and the like, the commanded speed of the servo motor 16 by the controller 26 and the actual speed of the servo motor 16 do not match, and this actual speed is as shown by the broken line in FIG. Since the period in which the speed commanded by the controller 26 is zero continues for a while, the actual speed of the servo motor 16 also drops to almost zero during that period. And the servo motor
The speed increasing period of 16 corresponds to the ascending period of the upper mold member 6, and the speed decreasing period of the servo motor 16 corresponds to the descending period of the upper mold member 6. Although it is punched out, the sheet-like material 3 is then dispensed during the period t in which the speed commanded by the controller 26 is zero. That is, the actual speed of the servo motor 16 is
As shown in FIG. 4, when the rotation angle of the output shaft 16a of the servomotor 16 is about 200 °, it becomes almost 0, but at that time, the upper die member 6 and the lower die member 7 are almost the same as the sheet-shaped material 3. The sheet remains in the thickness-separated state, and during this period, the sheet-like material 3 is dispensed.

[0005]

However, in the above-mentioned conventional method, since the command speed of the servo motor 16 by the controller 26 is set to 0 for a while in order to pay out the sheet-like material 3, it takes time, and the production There was a problem of poor sex. At the same time, since the actual speed of the servo motor 16 drops to almost 0, a high torque is required to start the servo motor 16 in each cycle, and there is a problem that vibrations occur.

The present invention is intended to solve such a problem, and provides a continuous punching method for a sheet-like material which can improve the productivity and can reduce the capacity of the servo motor used in the press machine. With the goal.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention intermittently punches a sheet-like object with an upper mold member and a lower mold member movable vertically. And a feeder for sequentially ejecting punched parts of the sheet material from the press machine, the press machine converts the rotation of the servomotor and the output shaft of the servomotor into vertical movement. Sheet using a continuous punching device having a power transmission mechanism for transmitting to the die member, a controller, and a driver for controlling the servo motor based on a command signal from the controller and a feedback signal from the servo motor, When the upper die member and the lower die member are separated from each other by the material thickness of the sheet-like material after punching out the material, the speed of the die member is reduced. Reluctant, in a continuous stamping process of the sheet to pay out sheet by the feeder, the command speed of the servo motor by the controller,
It is configured such that it rises from 0, then falls, and when it falls to 0, it immediately begins to rise again.

[0008]

In the continuous punching method for a sheet material according to the present invention, the rotation of the output shaft of the servo motor of the press is converted into vertical movement by the power transmission mechanism and transmitted to the die member,
The upper mold member and the lower mold member move vertically with respect to each other.
Then, the sheet-like material is punched by the upper die member and the lower die member, but after the punching, when the upper die member and the lower die member are separated by the material thickness of the sheet-like material, the speed of the die member is increased. In the lowered state, the punched portion of the sheet material is discharged from the press machine by the feeder. The above steps are repeated. By the way, in the press machine, the driver controls the servo motor based on the command signal from the controller and the feedback signal from the servo motor, but the command speed of the servo motor by the controller increases from 0 and then decreases until 0. As soon as it descends, it begins to rise again. In this way, when the command speed of the servo motor is set to 0 and the upper mold member and the lower mold member are substantially separated from each other in sheet thickness, the speed of the mold member is sufficiently reduced, but the command speed is only for a moment. By setting it to 0, the process time is shortened. Along with this, if the commanded speed becomes 0 for a moment, generally, the actual speed of the servo motor does not decrease to 0 due to responsiveness, etc., but this also reduces the acceleration amount and the servo motor Requires less torque.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for continuously punching a sheet-like material according to the present invention will be described below with reference to FIGS. The configuration of the continuous punching device used is
Since it is almost the same as the conventional one shown in FIGS. 5 to 8 described above, the reference numerals shown in FIGS. 5 to 8 are also referred to in the following description, and the description of the structure of the continuous punching device is omitted. .. In this embodiment, as in the conventional case, the command speed of the servo motor 16 by the controller 26 is a triangular wave as shown by the solid line in FIG. 1, but the time at which the command speed becomes 0 is instantaneous. That is, the commanded speed of the servo motor 16 by the controller 26 increases from 0 and then decreases, and when it decreases to 0, it immediately starts increasing again. Note that due to a delay in response and the like, the command speed of the servo motor 16 by the controller 26 and the actual speed of the servo motor 16 do not match, and this actual speed is as shown by the broken line in FIG. , Controller 26
Since the command speed due to becomes zero for a moment, the actual speed of the servo motor 16 does not drop to zero. And
The speed increasing period of the servo motor 16 corresponds to the ascending period of the upper mold member 6, and the speed decreasing period of the servo motor 16 corresponds to the descending period of the upper mold member 6, but at the time point shown by b in FIG. The descending upper mold member 6 is fitted into the lower mold member 7, and the sheet-like material 3 is punched out. After that, the upper die member 6 starts to rise, but at the time point indicated by c in FIG. 1, the actual speed of the servo motor 16 becomes the minimum, and the speed of the upper die member 6 also becomes slow. As shown in FIG. 2, this is when the rotation angle of the output shaft 16a of the servomotor 16 is between 200 and 210 ° (the portion shaded with parallel diagonal lines). Therefore, the upper mold member 6 and the lower mold member 7 are Is in a state in which the material thickness of the sheet-like material 3 is separated, and during that time, the sheet-like material 3 is fed by the feeder 2 for a predetermined length. As a result, the punched portion of the sheet material 3 is dispensed from the press machine 1. The punching of the sheet-like material 3 by such a press machine 1 and the feeder 2
The intermittent feeding of the sheet-like material 3 due to is sequentially repeated.

As described above, according to the configuration of the above-described embodiment, the command speed of the servo motor 16 by the controller 26 is set to 0, and the upper die member 6 and the lower die member 7 have substantially the same material thickness as the sheet-like material 3. When separated, the sheet-like material 3 is dispensed while the speed of the upper mold member 6 is sufficiently reduced, but the command speed is set to 0 only for a moment, so the process time is shortened. This improves productivity. Further, as described above, if the commanded speed becomes 0 only for a moment, the actual speed of the servo motor 16 does not decrease to 0 due to responsiveness etc., but this also reduces the acceleration amount. The torque of the servo motor 16 is small. That is, conventionally,
Since the actual speed of the servo motor 16 decreases to almost 0, the acceleration amount is large as shown by d in FIG. 3, but in the present embodiment, the acceleration amount is shown by e in FIG. It gets smaller. As a result, the torque required for the servo motor 16 becomes smaller and the servo motor 16 having a smaller capacity can be used.

The present invention is not limited to the above embodiment, and various modifications can be made. For example,
Although the above-mentioned embodiment was applied to the production line of the floppy disk, the present invention can be applied to the production line of other than the floppy disk.

[0012]

According to the present invention, after punching a sheet-like object by the upper die member and the lower die member driven by the servomotor of the press machine, the upper die member and the lower die member are substantially sheet-like articles. When the material thicknesses are separated, the controller commands the servo motor in the continuous punching method of the sheet-like material, in which the punched part of the sheet-like material is ejected from the press machine while reducing the speed of the die member. The speed rises from 0 and then decreases, and when it decreases to 0, it immediately starts to increase again, which shortens the process time, improves productivity, and if the commanded speed becomes 0 for a moment, it is common. In addition, due to responsiveness, etc., the actual speed of the servo motor does not decrease to 0,
The amount of acceleration is also small, the torque of the servo motor is small, and a servo motor with a small capacity can be used.

[Brief description of drawings]

FIG. 1 is a graph showing a command speed of a servo motor by a controller in an embodiment of a continuous punching method for a sheet-like material of the present invention.

FIG. 2 is a graph showing the relationship between the rotation angle of the output shaft of the servo motor and the payout timing.

FIG. 3 is a graph showing a command speed of a servo motor by a controller in an example of a conventional continuous punching method for a sheet-shaped material.

FIG. 4 is a graph showing the relationship between the rotation angle of the output shaft of the servo motor and the payout timing.

FIG. 5 is a block diagram of the same.

FIG. 6 is a sectional view of the continuous punching device at the same time as the top dead center.

FIG. 7 is a cross-sectional view of the continuous punching device at the same top and bottom dead center.

FIG. 8 is a sectional view of the continuous punching device at the time of dispensing.

[Explanation of symbols]

 1 Press machine 2 Feeder 3 Sheet material 6 Upper mold member 7 Lower mold member 16 Servo motor 16a Output shaft 17 Power transmission mechanism 26 Controller 27 Driver

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B26D 5/08 C 7347-3C B26F 1/00 Z 7411-3C

Claims (1)

[Claims] 1. A press machine for punching a sheet-like material by means of an upper mold member and a lower mold member which are movable in the up-down direction, and a sheet-like material which is intermittently fed to punch the part which has been punched. A feeder for sequentially paying out from the machine, the press machine, a servomotor, a power transmission mechanism for converting the rotation of the output shaft of the servomotor into vertical movement and transmitting it to the die member, a controller, and Using a continuous punching device having a driver that controls the servomotor based on a command signal from a controller and a feedback signal from the servomotor, after punching a sheet-like object, the upper die member and the lower die member are When the thickness of a sheet-like material is separated, the sheet-like material is discharged by the feeder while reducing the speed of the mold member. In the continuous punching method of the object, the command speed of the servo motor by the controller is
A continuous punching method for a sheet-like material, characterized in that it is configured to rise from 0, then descend, and as soon as it descends to 0, rise again.