JP3537174B2 - Processing method in punch press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method in a punch press equipped with a punch and a die for punching a work, and a stripper for holding the work when the punch is raised.

[0002]

2. Description of the Related Art Conventionally, in a punch press such as a turret punch press, a work on a die is punched by a punch and a die while a work on the die is pressed by a stripper descending with the punch. Has become.

Incidentally, in such a punch press machine, since a very loud noise is generated during the working operation, various measures have been taken to reduce the noise. For example, Japanese Patent Application Laid-Open No. Sho 62-183919 proposes a device in which noise is reduced by controlling the stroke of a punch in a noise-generating section. There has been proposed an apparatus in which the acceleration at the time of punching is released by squeezing the oil of a cylinder that receives a reaction force, thereby reducing the breakthrough noise generated at the time of punching a workpiece.

[0004]

However, in the former publication (Japanese Unexamined Patent Publication No. Sho 62-183919), the stripper is integrated with the punch via a disc spring. There is a problem that the breakthrough noise generated by the release of the energy stored in the frame cannot be avoided and the noise reduction is limited. Further, according to this publication, for example, when processing a soft material having a small tensile strength such as an aluminum alloy material,
For example, there is also a problem that a setting operation for adjusting the pressing force of the stripper by reducing the number of disc springs of a die used for processing stainless steel and preventing indentations on the work surface is required.

[0005] The latter publication (Japanese Patent Laid-Open No. 3-132)
No. 36), a stripper is provided via a hydraulic cylinder on a ram on which a punch is mounted, so that it is possible to reduce the breakthrough noise by adjusting the strip force to some extent. In Although,
Since the position control of the stripper cannot be performed, the work cannot be moved between the contact of the stripper with the work and the contact of the punch, and between the removal of the punch from the work and the detachment of the stripper. There are difficulties in improving the properties.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned various problems. The present invention can perform low-noise machining, can obtain high productivity, and does not produce an indentation of a stripper on a work surface. An object of the present invention is to provide a processing method in a punch press machine.

[0007]

In order to achieve the above-mentioned object, a working method in a punch press according to the present invention is directed to a punch having a punch and a die for punching a work, and a stripper for holding the work when the punch is raised. in the press, it provided a driving device of the stripper separately from the drive of the punch, on the basis of the operation mode and the punch operation mode of the stripper, each of the
It is characterized in that Gosuru system independently stripper and the punch each other.

In the present invention, the operation mode of the stripper is
The stripper is used during machining and when moving the workpiece.
Mode that holds the workpiece at a small distance from the workpiece
It is preferred that

[0009] In the present invention, any operation mode for holding the stripper when moving pressurized Engineering and during work at a position spaced a small distance from the work, the operation mode is brought into contact with the stripper to work only at the time of processing Preferably, one of the operation modes is selected.

Here, it is preferable that the pressing force of the stripper against the work is variable depending on the material of the work, the cutting circumference and the plate thickness.

[0011]

In the present invention, the position of the stripper with respect to the work is controlled independently of the position of the punch with respect to the work by the drive of the stripper provided separately from the drive of the punch. It is possible to limit the acceleration to a predetermined value, thereby reducing noise at the time of punching, preventing the occurrence of indentation on the work surface, and appropriately setting the contact timing and detachment timing of the stripper with the work. The setting improves the productivity.

Further, the operation mode of the stripper can be changed.
At the time of construction and movement of the work, the stripper is
When the mode is set to hold at a position a minute distance away from the
In the process, the work is processed and moved while the stripper is held at a position a minute distance from the work.
When the punch separates from the work, the work can be moved, the productivity can be improved by shortening the processing time, and the occurrence of dents on the work surface can be minimized.

Further, when machining and moving the workpiece,
Keep the stripper at a small distance from the workpiece.
Operating mode and the stripper only during machining.
One of the operation modes that contact the
In the case where the stripper can be selected , any of an operation mode in which the stripper is held at a position at a minute distance from the work during processing and movement of the work, and an operation mode in which the stripper contacts the work only during processing. Since machining is performed by selecting one of the operation modes, an operation mode can be selected according to a case where noise reduction is prioritized and a case where productivity is prioritized, so that a processing method with higher flexibility can be obtained.

[0014]

Next, a specific embodiment of a working method in a punch press according to the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a punch press according to an embodiment of the present invention. As shown in the drawing, in the punch press according to the present embodiment, a lower frame 1a having a lower portion integrated with a base and an upper frame 1b fixed to an upper portion of the lower frame 1a have a ring shape (O). ) Is provided. At a position slightly deviated to one side from the center in the longitudinal direction of the punch frame 1, a processing center 2 is disposed with an axis set in the up-down direction. A moving table 3 is arranged inside the punch frame 1 so as to cross the punch frame 1. And
An XY carriage 4 is provided on one side of the moving table 3 so as to be movable in the X-axis direction (the direction perpendicular to the paper surface) and the Y-axis direction (the horizontal direction in FIG. 1) along the upper surface of the lower frame 1a. A clamp 6 for gripping a plate-like work 5 is mounted on the XY carriage 4. In this way, the work 5 to be machined is gripped by the clamp 6, positioned by the XY carriage 4 in the X-axis direction and the Y-axis direction, and automatically sent to the punching operation position of the machining center 2.

As shown in FIG. 2, the processing center 2 has a punch (upper die) 7 on the upper frame 1b side and a stripper (plate holder) 8 fitted on the outer shape of the punch 7.
A die (lower die) 9 is mounted on the lower frame 1a so as to face the punch 7 and the stripper 8. These punch 7, stripper 8 and die 9
Is taken out of a mold magazine (not shown) arranged in a set state with the axis parallel to the punch frame 1,
It is transported to the processing center 2 and replaced. The punch 7, stripper 8 and die 9 are formed by the machining center 2.
The punch 7 is moved up and down by the operation of the punch driving servo cylinder 10, and the stripper 8
Is moved up and down separately from the punch 7 by the operation of the stripper driving servo cylinder 11.

The inside of the punch driving servo cylinder 10 is divided into an upper chamber 10a and a lower chamber 10b by a piston for moving the punch 7 up and down. The hydraulic pressure discharged from the hydraulic pressure source P is applied to the upper chamber 10 a and the lower chamber 10 b by an electromagnetically operated servo valve 12 for punch.
Is supplied via the Internet.

On the other hand, the cylinder chamber of the stripper driving servo cylinder 11 is divided into an upper chamber 11a and a lower chamber 11b by a piston for moving the stripper 8 up and down. The upper chamber 11a and the lower chamber 11b are supplied with hydraulic pressure discharged from a hydraulic pressure source P by a high-pressure reducing valve 14, a low-pressure reducing valve 15, an electromagnetically operated switching valve 16, a check valve 17, and an electromagnetically operated stripper servo. It is supplied via a valve 18. Here, when the switching valve 16 is operated, either the high-pressure reducing valve 14 or the low-pressure reducing valve 15 is selected, whereby the hydraulic pressure supplied to the stripper servo valve 18 is set to either high or low pressure. . The accumulator indicated by reference numeral 13 in FIG. 2 is an accumulator.

The punch servo valve 12 and the switching valve 1
6 and the stripper servo valve 18 are NC devices 19
It is operated by the control signal from. To calculate this control signal, program data from an unillustrated automatic programming system (CAD, CAM) is input to the NC device 19 via the NC data input unit 20.
In the automatic programming system, an appropriate pressing force of the stripper 8 is calculated based on each input data of the material of the workpiece, the cutting circumference and the plate thickness. As a result of the calculation, the high hydraulic pressure supplied to the stripper servo valve 18 is calculated. The data for selecting the low pressure switching is the NC data input unit 2
0 to the NC device 19. Then, the NC device 19 automatically outputs a signal for selecting the high / low pressure to the switching valve 16.

The automatic programming system also has an operation mode (to be described in detail later) of the punch 7 and the stripper 8 which is preset according to the processing time zone, the processing shape of the product, the characteristics of the machine, and the like when the program is created. Such data is also input, and this data is also output to the NC device 19 via the NC data input unit 20. Based on this data, the NC device 19 outputs a flow rate control signal to the punch servo valve 12 and the stripper servo valve 18 to control the elevation speed of the punch driving servo cylinder 10 and the stripper driving servo cylinder 11, respectively.

When the switching valve 16 is operated by the control signal from the NC unit 19, the hydraulic pressure supplied to the servo valve 18 for the stripper, in other words, the pressing force of the stripper 8, changes the material of the work 5 and the cutting circumference. The pressure is switched to either high pressure or low pressure according to the sheet thickness and the punch servo valve 12 and the stripper servo valve 18 are operated, so that the punch 7
In addition, as an operation mode of the stripper 8, either a first operation mode or a second operation mode described later is selected.

Next, two operation modes of the punch 7 and the stripper 8 in this embodiment will be described with reference to FIGS. In these figures, (a)
(B) and (c) show the positional relationship between the punch 7 and the stripper 8 over time, and (d) also shows the respective positions of the punch 7 and the stripper 8 over time over time.

In the first operation mode shown in FIG. 3, first, the stripper 8 is lowered at the speed V1 from the standby point b, and simultaneously, the punch 7 is moved to the standby point a above the standby point b.
At a speed V2 (> V1) to a standby point c below the standby point b. Next, the punch 7 waits at the standby point c until the stripper 8 comes into contact with the work 5, and the speed V1 until the punch 7 reaches the point e after the stripper 8 comes into contact with the work 5.
Then, it is lowered at the speed V2 until the point g (the lowest point), and the punching by the punch 7 is executed. After punching, the punch 7 is raised from the point g to the standby point a at the speed V2, and immediately after the punch 7 is separated from the work 5, the stripper 8 is raised at the speed V2 to the standby point b. In the first operation mode, since the punch 7 and the stripper 8 are both brought into contact with the work 5 at a small speed (V1), the contact sound is reduced at the time of this contact, and the breakthrough noise is reduced as a whole. In addition, the indentation on the surface of the work 5 due to the pressing force of the stripper 8 can be reduced. The stripper 8 is brought into contact with the work 5 immediately before the punch 7 comes into contact with the work 5.
Since the stripper 8 is separated from the work 5 immediately after the punch 7 is separated from the work 5, the processing time can be reduced as compared with the conventional punch-stripper integrated type, and the productivity can be improved. it can. This shortening of the processing time has a remarkable effect especially at the time of nibbling. In FIG. 3, reference numeral 21 indicates a punching waste.

As a comparative example, a conventional punch-stripper
FIG. 5 shows the operation mode when the integral type is used.
You. In this conventional operation mode, the punch 7 moves to the standby point a.
From the standby state where the stripper 8 is at the standby point b, pan
H and the stripper 8 are integrally lowered at the speed V1.
At this speed V1, the stripper 8 comes into contact with the work 5
d, while the punch 7 reaches point e. Bread after this
The operation modes of the switch 7 and the stripper 8 are the same as those of the above-described embodiment.
This is similar to the first operation mode. These FIGS. 3 and 5
As is clear from FIG.
Punch 7 after stripper 8 contacts workpiece 5
T until the workpiece contacts the work 5₁Is the operation of the conventional example
Time t in mode₁₁Has been shortened compared to. Ma
After the punch 7 is separated from the work 5, the stripper 8
T until the workpiece comes off the work 5 _TwoAlso in the conventional example
Interval t₁₂Can be shortened as compared with.

Next, in the second operation mode shown in FIG. 4, first, the stripper 8 is lowered from the standby point b to the standby point c at the speed V2, and at the same time, the punch 7 is moved to the standby point a.
At a speed V2 to a standby point c. Next, while the stripper 8 is waiting at the standby point c, the punch 7 is lowered at the speed V1 until the point e and thereafter at the speed V2 until the point g, and the punching by the punch 7 is performed. After punching, the punch 7 is raised from the point g to the standby point a at the speed V2, and the stripper 8 is raised at the speed V2 to the standby point b in a manner following the rise of the punch 7. In the second operation mode, the work 5 is punched in a state where the stripper 8 is held at a position separated by a minute distance (for example, 0.5 mm) from the work 5, that is, at the standby point c, and the work 5 is moved. Is performed, the processing time can be further reduced as compared with the first operation mode. The second operation mode is an effective operation mode when priority is given to improving productivity and minimizing indentations on the surface of the work 5 over noise reduction. FIG. 6 shows each operation mode of the present embodiment in comparison with the conventional example. From this figure, the first operation mode (indicated by P2 and S2) of the present embodiment is greater than the first operation mode (indicated by P2 and S2) than in the conventional example (indicated by P1 and S1). P3 and S3) show that the processing time is shorter.

[0026]

As described above, according to the present invention,
For example, since the drive of the stripper is provided separately from the drive of the punch and the position of the stripper relative to the work is controlled independently of the position of the punch, the acceleration of the stripper when punching the work is limited to a predetermined value. This makes it possible to reduce noise at the time of punching and to prevent the occurrence of indentations on the work surface. In addition, productivity can be improved by appropriately setting the position of the stripper. Also, stripper
The operating mode, a mode for holding the stripper during movement during machining and workpiece at a position spaced a small distance from the workpiece
In this case, the processing time can be further reduced, the productivity can be improved, and the occurrence of indentations on the work surface can be minimized. Furthermore, so that the stripper during movement of the working time and the work can be selected with the operation mode held in the position spaced a small distance from the work, either mode of operation of the operation mode is brought into contact with the stripper to work only at the time of processing In this case, the operation mode can be selected according to the case where noise reduction is prioritized and the case where productivity is prioritized, and a processing method with a higher degree of freedom can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a punch press according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a control system according to the present embodiment.

FIG. 3 is an explanatory diagram of a first operation mode in the present embodiment.

FIG. 4 is an explanatory diagram of a second operation mode in the present embodiment.

FIG. 5 is an explanatory diagram of an operation mode of a conventional example.

FIG. 6 is a diagram showing each operation mode of the present embodiment in comparison with a conventional example.

[Explanation of symbols]

2 Processing center 7 Punch 8 Stripper 9 die 10 Servo cylinder for driving punch 11 Servo cylinder for stripper drive 12. Servo valve for punch 14 High pressure reducing valve 15 Low pressure reducing valve 16 Switching valve 18 Servo valve for stripper 19 NC equipment 20 NC data input section

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B21D 28/00-28/02 B21D 28/24 B30B 15/00 B30B 15/28

Claims (4)

(57) [Claims] A punch and a die for punching a work;
In the punch press and a stripper for pressing a workpiece during rise of the punch is provided with a drive device of the stripper separately from the drive of the punch, on the basis of the operation mode and the punch operation mode of the stripper, each of the stripper and Said
Machining method in the punch press, characterized in that Gosuru independently of each other system the punch. 2. The stripper operation mode is a mode in which the stripper is held at a position at a minute distance from the work during machining and movement of the work.
The processing method in the punch press described in 1. 3. An operation mode in which the stripper is held at a position separated from the work by a minute distance during processing and when the work is moved, and an operation mode in which the stripper is brought into contact with the work only during processing. The processing method in the punch press according to claim 1, wherein is selected. 4. The processing in a punch press according to claim 1, wherein the pressing force of the stripper against the workpiece is variable according to the material, the cutting circumference and the plate thickness of the workpiece. Method.