JP2001087822A - Working method and device for punch press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a hit rate without commanding a long ram stroke commanded by controller when a ram stroke is short like marking. SOLUTION: By a hydraulic cylinder 19 of stoke adjustable through actuation of a servo mechanism of a linear serve amplifier 53, a linear servo valve 31 in a punch press, etc., a punch P is hit by an up/down elevatable ram 21, punching is conducted on the work between a die D facing the punch P and the punch, based on a working program of a controller 15. In this working, when a ram stroke is below a stroke set value set beforehand, a hit rate is increased by switching to increase a gain of the servo mechanism so as to increase followablity of the ram 21. Further, when a ram stroke is larger than a stroke set value set beforehand in the case of normal punching, a gain of the serve mechanism is decreased, vibration and noise are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for working a punch press.

[0002]

2. Description of the Related Art Conventionally, in a punch press in which a punch is hit with a ram which can move up and down by a hydraulic cylinder of a punch press, and a workpiece is punched by a die of the punch and a die, a stroke of the ram of the hydraulic cylinder is used. Since the amount can be freely set, a high hit rate can be obtained by reducing the stroke amount.

For example, the actual ram stroke during normal punching is 8 mm, and the actual ram stroke during marking is 2 mm.

[0004]

[SUMMARY OF THE INVENTION Incidentally, in the processing method and apparatus of a conventional punch press is actually for instruction ram stroke S ₀ being commanded to the control device as shown in FIG. 7 Because the ram's following becomes worse,
Directive ram stroke S ₀ had been longer instruction than the actual ram stroke S _1.

[0005] For example, when the actual ram stroke S ₁ in normal punching to 8mm, it is necessary to command the ram stroke S ₀ to 8.5 mm, the actual ram stroke S ₁ at the time of marking If you want to 2mm, it is necessary to command the ram stroke S ₀ to 3 mm.

However, when the difference between the commanded ram stroke S ₀ and the actual ram stroke S ₁ is compared between the time of marking and the time of normal punching, the difference (0.5 mm) during normal punching is the actual ram stroke. S ₁ (8m
m), but the difference (1 mm) at the time of the marking process is large relative to the actual ram stroke S ₁ (2 mm). Therefore, if the command ram stroke S ₀ as the time of marking is short, it can be seen that follow rams very bad.

The time T ₁ during which the ram stroke is performed is inevitably determined, but since the command ram stroke S ₀ must be commanded longer than the actual ram stroke S ₁ , the time until the ram returns to the rising end is required. T ₂ becomes longer.
Therefore, there is a problem that the number of strokes is reduced and the hit rate cannot be improved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an object to solve the problem even if the ram stroke commanded by the control device is not long even when the ram stroke is short as in the case of marking. It is an object of the present invention to provide a punch press processing method and apparatus capable of improving a hit rate.

[0009]

According to a first aspect of the present invention, there is provided a punch press working method according to the first aspect of the present invention, wherein a hydraulic cylinder capable of adjusting a ram stroke by operating a servo mechanism in the punch press. When a punch is hit with a ram and punching is performed on a workpiece by cooperation of the punch and the die, the gain of the servo mechanism is increased in order to increase the followability of the ram when the ram stroke is equal to or less than a preset stroke set value. And when the ram stroke is greater than the stroke set value, the gain of the servo mechanism is switched to be reduced.

Therefore, when performing a punching process based on a processing program of the control device, when the ram stroke being processed is equal to or less than a preset stroke set value as in the case of a marking process, the gain of the servo mechanism is increased to improve the followability of the ram. Because it can be raised, the hit rate improves.
On the other hand, when the ram stroke being processed is larger than the stroke set value as in the case of normal punching processing, the gain of the servo mechanism is reduced, so that vibration and noise are reduced.

According to a second aspect of the present invention, there is provided a punch press working apparatus in which a punch is hit by a vertically movable ram by a hydraulic cylinder capable of adjusting a ram stroke by the operation of a servo mechanism, and the punch and the die cooperate with each other. In a punch press working apparatus for performing punching on a work by controlling the ram stroke with a control device, the control device switches the ram stroke to increase the gain of the servo mechanism when the ram stroke is equal to or less than a preset stroke set value. When the ram stroke is larger than the stroke set value, a ram control unit is provided for giving a command to switch to reduce the gain of the servo mechanism.

Therefore, the operation is the same as that of the first aspect, and when punching is performed based on a processing program of the control device, when the ram stroke being processed is less than a predetermined stroke set value, such as marking processing, servo control is performed. Since the followability of the ram is increased by increasing the gain of the mechanism, the hit rate is improved. On the other hand, when the ram stroke being processed is larger than the stroke set value as in the case of normal punching processing, the gain of the servo mechanism is reduced, so that vibration and noise are reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a punch press working method and apparatus according to the present invention will be described below with reference to the drawings. Note that the present embodiment is directed to a turret punch press as an example, but is not limited to this model.

Referring to FIG. 3, for example, a turret punch press 1 as a punch press according to the present embodiment
Has a frame structure in which both sides of the upper frame 9 are supported by side frames 5 and 7 erected on both sides of the base 3. At the lower part of the upper frame 9, a disk-shaped upper turret 11 having various types of punches P detachably mounted is rotatably mounted. On the upper surface of the base 3, a lower turret 13 facing the upper turret 11
Are mounted on the lower turret 13 in such a manner that a number of dies D opposed to various types of punches P are arranged in an arc shape and are detachably mounted. The axis of the upper turret 11 and the axis of the lower turret 13 are arranged on the same axis, and the upper turret 11 and the lower turret 13 are controlled by a control device 15 described later.
Rotated synchronously in the same direction.

The upper turret 11 and the lower turret 13
Die D and punch P mounted on the right side in FIG.
Is a processing position, and the upper frame 9 above the punch P at the processing position is the striker 1.
7 is provided to be vertically movable. This striker 17
Is connected to a hydraulic cylinder 19 as a drive device provided in the upper frame 9 via, for example, a ram 21 (a pressure member).

The ram 21 presses the punch P indexed and positioned below the ram 21 by the rotation of the upper turret 11 and the lower turret 13.

The turret punch press 1 is provided with a work W movement positioning device 23 for moving and positioning the work W in the front, rear, left and right directions. At the far right,
A carriage base 25 is provided that is movable in the Y-axis direction (the left-right direction in FIG. 3). The carriage base 25 is movable in the X-axis direction (a direction perpendicular to the plane of FIG. 3). A carriage 27 is provided. The carriage 27 is provided with a plurality of work clamps 29 that clamp the work W at appropriate intervals in the X-axis direction.

The movement positioning device 23 is provided with a control device 15
And positions the work W at a desired position between the punch P and the die D.

Therefore, after the plate-like work W is positioned between the punch P mounted on the upper turret 11 and the die D mounted on the lower turret 13, the punch P is pressed by the ram 21 so that The punching process is performed on the work W by the punch P and the die D.

Referring to FIG. 1, the hydraulic cylinder 1
The ram stroke 9 is configured such that the supply of pressure oil to the hydraulic cylinder 19 is adjusted via, for example, a linear servo valve 31 as a servo mechanism. Therefore, the hydraulic cylinder 1 is switched by switching the linear servo valve 31.
Since the vertical movement position of the piston rod 33 is freely adjustable, the stroke amount of the piston rod 33, that is, the ram stroke is freely adjusted.

As a hydraulic circuit of the hydraulic cylinder 19, a pressure oil supply line 41 of a variable displacement hydraulic pump 39 driven by an oil tank 35 by a pump motor 37 communicates with a P port of the linear servo valve 31. . The A port of the linear servo valve 31 is connected to the pressurizing chamber 45 of the hydraulic cylinder 19 via the pressurizing pipe 43, and the B port of the linear servo valve 31 is connected to the hydraulic cylinder 19 via the back pressure pipe 47. It communicates with the back pressure chamber 49. Also,
The T port of the linear servo valve 31 is connected to the oil tank 35 via a discharge-side pipe 51. In addition,
The above-described linear servo valve 31 is electrically connected to the control device 15 via a linear servo amplifier 53 constituting a servo mechanism for controlling the linear servo valve 31.

Therefore, when the flow path of the linear servo valve 31 is switched to connect the P port to the A port and the B port to the T port, the pressure oil from the pressure oil supply pipe 41 passes through the pressurization pipe 43. It flows into the pressurizing chamber 45 of the hydraulic cylinder 19 and lowers the piston rod 33. Then, the pressure oil discharged from the back pressure chamber 49 of the hydraulic cylinder 19 enters the B port of the linear servo valve 31 through the back pressure line 47, and passes through the discharge side line 51 from the T port to the oil tank 3.
Returned to 5.

When the flow path of the linear servo valve 31 is switched so that the P port communicates with the B port and the A port communicates with the T port, the pressure oil from the pressure oil supply pipe 41 flows through the back pressure pipe 47. The fluid flows into the back pressure chamber 49 of the hydraulic cylinder 19 and the piston rod 33 is raised. The pressurized oil discharged from the pressurizing chamber 45 of the hydraulic cylinder 19 passes through the pressurizing pipe 43 to the A port of the linear servo valve 31, and passes through the discharge pipe 51 from the T port to the oil tank 3.
Returned to 5.

As shown in FIG. 4, the control device 15 includes, for example, a CPU 55 as a central processing unit, an input device 57 for inputting data such as a machining program, a display device 59, and a display device 59. Memory 6 to store
1 is connected. The memory 61 stores a machining program and a stroke set value.

In the case of marking, the ram stroke of the marking process is considerably smaller than the ram stroke of the punching process because the punch P only bites into the work W in the case of marking. The stroke value is a preset stroke value between these two ram strokes in order to distinguish the ram stroke from the punching ram stroke.

Further, the CPU 55 has a memory 61.
Based on the machining program stored in the program command unit 63 to perform a command program including information for determining the command ram stroke S ₀ shown in FIG. 5
When, a program execution unit 65 for the execution of the program by a command from the program command unit 63, or provides an instruction to create a press pattern to the linear servo amplifier 53, command the ram stroke S ₀ described above is set in advance switching to output a gain switching instruction to increase the gain to get to improve tracking of the ram 21 when: stroke setting value of the actual ram stroke S ₁ shown in FIG. 5 to the linear servo amplifier 53 A ram control unit 69 having a command unit 67 is connected.

The above-described linear servo amplifier 53 controls the linear servo valve 31 in response to a command from the ram control unit 69, and is connected to the CPU 55. In addition, the linear servo amplifier 53 includes a punching gain section 7 for lowering the gain during normal punching.
1 and two types of gain parts for marking processing 73 for increasing the gain at the time of marking processing are internally provided, and the two kinds of gains for punching are obtained by receiving a gain switching command from a switching command part 67. The unit is switched to one of the unit 71 and the marking processing gain unit 73.

With the above configuration, as shown in FIGS. 1 and 2, the program command section 63 issues a program command including information for determining the command ram stroke S ₀ based on the machining program in the memory 61. Done. The program execution unit 65 executes the program according to the command from the program command unit 63 (step S1).
And S2).

The ram control unit 69 creates a press pattern and gives a command to the linear servo amplifier 53. At this time, instruction ram stroke S ₀ as shown in FIG. 2
Is determined to be less than or equal to the stroke set value (step S3).

When the command ram stroke S ₀ is equal to or less than the stroke set value as in the case of the marking processing, a gain switching command is shown in FIG. 1 so that the gain switching signal is turned ON to increase the gain of the linear servo amplifier 53. Is output to the linear servo amplifier 53 as shown in FIG. The gain of the linear servo amplifier 53 is a position loop gain or a speed loop gain.

The force can follow to become relative linear servo amplifier command ram stroke S ₀ the gain is raised hydraulic cylinder 19 is rapidly accelerated in 53. In this case, to vibration or abnormal noise is generated during the marking, but not to the vibration or noise is much of a problem since the actual small ram stroke S _1. The marking process is performed in this state (steps S4 and S5).

It is determined based on the machining program whether machining has been completed. If machining has not been completed, the process returns to step S3, and the ram control unit 69 compares whether the command ram stroke S0 is equal to or less than the stroke set value. It is determined (from step S6 to S3).

[0033] When command ram stroke S ₀ as in normal punching is greater than the stroke setting value, the linear gain switching signal to the gain is lowered in the normal gain of the servo amplifier 53 is gain so that the OFF switching command Is output to the linear servo amplifier 53. When the gain of the linear servo amplifier 53 is reduced, vibration and abnormal noise generated during punching are reduced. In this state, normal punching is performed.

That is, as shown in FIG. 6, during normal punching, when the command ram stroke S ₀ is 8.5 mm, the actual ram stroke S ₁ is the same as in the prior art.
Is 8 mm, and the followability of the ram is not bad even when judged as a whole (steps S7 and S8).

It is determined based on the processing program whether the processing has been completed. If it is determined that the processing has been completed, all the processing is completed (step S6).

[0036] As described above, when punching based on the processing program of the control unit 15, instruction ram stroke S ₀ during processing of the linear servo amplifier 53 when in the following stroke setting value set in advance as marking since raised conformability of the ram 21 by increasing the gain, to follow substantially close state with respect to command the ram stroke S ₀ being commanded at the indicated as actual ram stroke S ₁ is programmed into the FIG. 5 From that
It is possible to reduce the instruction ram stroke S _0.

The ram 21 between each instruction ram stroke S ₀
Since There has been determined the waiting time T ₁ to wait, but the same time be a conventional even present invention is according to, when the instruction ram stroke S ₀ is smaller, shorter time T ₂ of the up ram 21 is returned to upper end Therefore, since the number of strokes can be increased, the hit rate can be improved.

On the other hand, when the command ram stroke S ₀ during machining is larger than the stroke set value as in normal punching, the gain of the linear servo amplifier 53 is reduced, so that vibration and noise are reduced.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. In the above-described embodiment, the case where the gain of the linear servo amplifier is increased has been described. However, a linear servo valve may be used. Further, a system similar to the present invention may be applied to an apparatus using a servomotor.

[0040]

As will be understood from the above description of the embodiment of the invention, according to the first aspect of the present invention, when punching is performed based on a processing program, the ram being processed such as marking is performed. When the stroke is equal to or less than a preset stroke set value, the gain of the servo mechanism is increased by the control device to increase the ram followability, so that the hit rate can be improved. On the other hand, when the ram stroke being processed is larger than the stroke set value as in the case of normal punching processing, the gain of the servo mechanism is reduced, so that vibration and noise can be reduced.

According to the second aspect of the present invention, the same as the effect of the first aspect, when performing punching processing based on a processing program, a ram stroke during processing such as marking processing is set to a predetermined stroke set value. In the following cases, the gain of the servo mechanism is increased by the control device to improve the followability of the ram, so that the hit rate can be improved. On the other hand, when the ram stroke being processed is larger than the stroke set value as in the case of normal punching processing, the gain of the servo mechanism is reduced, so that vibration and noise can be reduced.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a schematic explanatory view of a processing apparatus for a punch press.

FIG. 2, showing an embodiment of the present invention, is a flow chart of a punch press working method.

FIG. 3 is a side view of a turret punch press used in the embodiment of the present invention.

FIG. 4 is a configuration block diagram of a control device.

FIG. 5 is a state diagram of a ram stroke during marking processing according to the embodiment of the present invention.

FIG. 6 is a state diagram of a ram stroke during punching according to the embodiment of the present invention.

FIG. 7 is a state diagram of a ram stroke during a conventional marking process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Turret punch press (punch press) 11 Upper turret 13 Lower turret 15 Control device 19 Hydraulic cylinder (drive device) 21 Ram (pressing member) 31 Linear servo valve (servo mechanism) 33 Piston rod 53 Linear servo amplifier (servo mechanism) 55 CPU (central processing unit) 61 memory 63 program command unit 65 program execution unit 69 ram control unit S ₀ command ram stroke S ₁ actual ram stroke

Claims (2)

[Claims] When a punch is hit by a ram that can move up and down by a hydraulic cylinder capable of adjusting a ram stroke by the operation of a servo mechanism in a punch press, and when a punch is punched on a work by cooperation of the punch and a die, When the ram stroke is equal to or less than a preset stroke set value, the gain of the servo mechanism is switched to increase the ram followability, and when the ram stroke is larger than the stroke set value, the gain of the servo mechanism is decreased. A punch press working method characterized by the above-mentioned. 2. A hydraulic cylinder capable of adjusting a ram stroke by the operation of a servo mechanism. A punch is hit by a vertically movable ram, and the ram stroke is controlled by a control device in cooperation with the punch and a die. In a punch press working apparatus for performing punching, the control device may switch to increase the gain of the servo mechanism when the ram stroke is equal to or less than a preset stroke set value and the ram stroke may be increased when the ram stroke is larger than the stroke set value. A punch press working device, comprising: a ram control unit for giving a command to switch to lower the gain of a servo mechanism.