JP2001321853A - Dead zone treating method in punch press, and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably prevent the interference of a die and a clamp caused by the mist-detection of a dead zone in an X-axis direction. SOLUTION: A carriage base is moved in a Y-axis direction, a carriage having the clamp is moved in the X-axis direction on the carriage base, and a work held by the clamp is positioned at a working part comprising the die, and worked. When working the first work of the same working program, the X-axis direction of the dead zone of the working unit is detected by an X-axis dead zone detection part, the dead zone is detected when the dead zone in the Y-axis direction exceeds a moving distance setting range of the preset carriage base (steps S1-S3), and a dead zone program block is stored in a memory (step S5). In the working of the second and subsequent works, the interference prevention processing is implemented by the dead zone program block detected in working the first work in a software manner (steps S14-S15), and a conventional error detection in a hardware manner is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for dead zone processing in a punch press.

[0002]

2. Description of the Related Art Conventionally, for example, in a turret punch press 101 as a punch press, as shown in FIGS. 7 and 8, a mold comprising a punch P and a die D mounted on upper and lower turrets 103 and 105. The punch W is pressed by the hydraulic press through the ram 107 using the
In order to improve the hit rate, the punch P is normally located at the rising end (first top dead center) slightly above the position where the workpiece W is pressed, but is located below the ram 107 at the punching position K. When the clamp devices 109A and 109B move in the X-axis and Y-axis directions corresponding to the diameter of the mold composed of the punch P and the die D, in other words, the clamp devices 109A and 109B collide with the mold. .

For this purpose, a turret punch press 101
When machining a plurality of workpieces W with the same mold using the same program using
Clamping device 1 in dead zone DZ in X and Y axes
When 09A and 109B enter, the punch P is configured to be avoided at the position of the second top dead center above the normal first top dead center so that the mold does not collide with the clamp devices 109A and 109B. ing.

In order to detect whether or not the clamp devices 109A and 109B have entered the dead zone DZ, X
In the axial direction, it is detected mechanically (hard) by a sensor, and in the Y-axis direction, it is detected by software by parameter setting.

[0005] For example, in the X-axis direction, as shown in FIG. 7, the punch below the ram 107 at the punching position K of the turret punch press 101 in the X-axis direction on the carriage base 111 as shown in FIG. 7. X-axis D at a position corresponding to X-axis direction by Xd equivalent to the diameter of the mold composed of P and die D
A Z dog 113 is provided. Clamping device 109
A and 109B are provided on a carriage 115 that moves on the carriage base 111 in the X-axis direction. The X-axis DZ dog 113 is provided on each of the clamping devices 109A and 109B at both widths in the X-axis direction. An X-axis touch sensor 117 for detection is provided.

Therefore, the X-axis touch sensor 117 detects the X-axis DZ dog 113 when the carriage 115 moves in the X-axis direction.
It can be seen that any one of 109B has entered the dead zone in the X-axis direction.

In the Y-axis direction, a set distance Yd from the positions of the clamping devices 109A and 109B on the original carriage base 111 to the die at the punching position K.
(Parameter setting) is stored in advance in the memory of the control device, and when the distance that the carriage base 111 has moved in the Y-axis direction from the original position toward the punching processing position K exceeds the above set distance Yd, the clamping device 109A,
109B has entered the dead zone in the Y-axis direction.

Actually, it is determined that the clamp devices 109A and 109B have entered the dead zone DZ only when they have entered the dead zones in both the X-axis direction and the Y-axis direction. By this determination, the clamp device 109
The punch P is reliably raised to the position of the second top dead center before A and 109B enter the dead zone DZ.

[0009]

In the conventional punch press, since the dead zone in the Y-axis direction is detected by software, it is accurately detected.
However, for the dead zone in the X-axis direction, the Y-axis is used for structural reasons such as a plurality of clamping devices 109A and 109B and the position of the clamping devices 109A and 109B may be changed on the carriage 115. Since it is difficult to detect in a software manner as in the case of the direction, the detection is performed in a hardware (mechanical) manner using a sensor as described above. As a result, erroneous detection of the sensor and the like may occur.
And the clamping device 109A, 1 as shown in FIG.
09B interferes, that is, collides.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a punch press capable of reliably preventing interference between a mold and a clamp device due to erroneous detection of a dead zone in the X-axis direction. And a dead zone processing method therefor.

[0011]

According to a first aspect of the present invention, there is provided a method for processing a dead zone in a punch press, comprising the steps of: moving a carriage base in a Y-axis direction; By moving the work clamped by the clamp device to a processing portion made of a die of a punch press and performing processing by moving the work base in the X-axis direction with respect to the carriage base, a first sheet of the same processing program is used. When machining the workpiece, the X-axis dead zone detection unit detects the X-axis direction of the dead zone corresponding to the X-axis and Y-axis directions of the processing unit, and the carriage base in which the Y-axis direction of the dead zone is set in advance. Is detected when the moving distance setting range is exceeded, and when the dead zone is detected in both the X-axis direction and the Y-axis direction. A zone / program block is stored in a memory, and when a second or subsequent work is machined, interference prevention processing between a mold and a clamp is performed by a program block including a dead zone detected at the time of the first work. Things.

Therefore, in the machining of the second and subsequent workpieces, the data at the time of machining the first workpiece is a dead zone.
The machining program is executed while being reflected in the machining program as a program block, and the interference prevention processing is executed by software. As a result, hard (mechanical) erroneous detection of the dead zone in the X-axis direction as in the related art does not occur, so that interference between the mold and the clamp device is reliably prevented.

According to a second aspect of the present invention, there is provided a dead zone processing apparatus in a punch press according to the present invention, wherein a carriage provided with a clamp device is movably movable in the X axis direction on a carriage base movably provided in the Y axis direction in the punch press. Provided, a processing part provided with a mold for performing the processing by positioning the workpiece clamped to the clamping device, X-axis of the punch press, a dead zone of the area corresponding to the processing part in the Y-axis direction, An X-axis dead zone detector is provided for detecting that the clamp device has entered the X-axis direction of the dead zone, and when the clamp device moves beyond a preset moving distance setting range of the carriage base, the clamp device moves to the dead zone. A Y-axis dead zone detector that detects intrusion in the Y-axis direction of The X-axis dead zone detection unit and Y
A memory that stores a dead zone program block when a dead zone is detected by both of the axis dead zone detection units is provided, and a program including the dead zone detected at the time of machining the first sheet is provided when machining the second and subsequent workpieces. The block is provided with a dead zone control unit for giving a command for performing a process of preventing interference between the mold and the clamp device.

Therefore, the operation is the same as that of the first aspect, and in the processing of the second and subsequent workpieces, the data at the time of processing the first workpiece is reflected as a dead zone program block in the processing program. Then, the machining program is executed, and the interference prevention processing is executed by software.
As a result, hard (mechanical) erroneous detection of the dead zone in the X-axis direction as in the related art does not occur, so that interference between the mold and the clamp device is reliably prevented.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and apparatus for dead zone processing in a punch press according to the present invention will be described below with reference to the drawings.

Referring to FIGS. 2 and 3, for example, a turret punch press 1 as a punch press according to the present embodiment has side frames 5 and 7 erected on both sides of a base 3 on both sides of an upper frame 9. It is configured in a supported frame structure.

At the lower part of the upper frame 9, a disk-shaped upper turret 11 having various types of punches P detachably and interchangeably provided.
Is rotatably mounted. On the upper surface of the base 3, a lower turret 13 facing the upper turret 11 is rotatably mounted. On the lower turret 13, a number of dies D facing various types of punches P are arranged in an arc shape. And it is detachably mounted. Upper turret 11
The axis of the lower turret 13 and the axis of the lower turret 13 are arranged on the same axis.
Are rotated synchronously in the same direction under the control of an appropriate control device such as a numerical control device.

A ram 15 (a pressure member) is mounted on the lower surface of the upper frame 9 at a substantially central portion so as to be vertically movable. The ram 15 is connected to, for example, a lower end of a piston rod 19 of a hydraulic cylinder 17 mounted on the upper frame 9. The punch P and the die D are indexed and positioned below the ram 15 by the rotation of the upper turret 11 and the lower turret 13, and the positioned punch P is moved by the ram 15 operated by the vertical movement of the piston rod 19 of the hydraulic cylinder 17. The work W is pressed.

The turret punch press 1 is provided with a work movement positioning device 21 for moving and positioning the work W in the front, rear, left and right directions, and the work W is gripped by its clamp devices 23A and 23B. The work movement positioning device 21 is controlled by the control device to position the work W at an appropriate position between the punch P and the die D.

Referring to FIGS. 2 and 3, the work movement positioning device 21 is disposed on the front side of the turret punch press 1 (lower right side in FIG. 2). The work movement positioning device 21 is provided with a Y-axis servomotor 27 as a Y-axis feed mechanism and a Y-axis ball screw 29 on a horizontally mounted center table 25 so as to be movable from the near side to a punching position K. Moreover, the side table 31 is mounted on the left and right sides of the center table 25 in a divided form.
At the outer edge of the side table 31, a carriage base 3 having a length substantially equal to the entire machine width of the turret punch press 1 is provided.
3 is fixed. The Y-axis servomotor 27 is electrically connected to the control device 35 as shown in FIG.

The side table 31 is moved by the Y-axis feed mechanism.
In addition, the carriage base 33 moves in the Y-axis direction, and the work W clamped by the clamp devices 23A and 23B is positioned in the Y-axis direction.

A guide rail (not shown) made of square steel for moving the carriage is provided below the side of the carriage base 33 facing the turret punch press 1. A carriage 37 provided with clamping devices 23A and 23B is slidably provided in the X-axis direction along the guide rails on the mounting side surface.

An X-axis ball screw 39 provided on the side surface of the carriage base 33 substantially through the center of the carriage 37
Are arranged as shown in FIGS. 2 and 3, and are driven and rotated by an X-axis servo motor 41 as an X-axis feed mechanism. The so-called feed of the carriage 37 in the X-axis direction and positioning of the workpiece W in the X-axis direction are freely performed in the length direction of the carriage base 33 by rotation of the X-axis ball screw 39. The X-axis servo motor 41 is electrically connected to the control device 35 as shown in FIG.

Therefore, after the plate-shaped 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 lowered by the ram 15, The punching process is performed on the work W by the punch P and the die D.

Next, the X-axis and Y-axis dead zone detectors 43 and 45 (see FIG. 4) which constitute a part of the main part of this embodiment will be described.

Referring to FIG. 2, in the case of a hydraulic press, the punch P is usually at a rising end (first top dead center) slightly above the position where the work W is pressed in order to improve the hit rate. Punch P below ram 15 at punching position K
And the die device D in the X-axis and Y-axis directions corresponding to the die diameter, in other words, in the dead zone DZ.
When A and 23B move, the clamp device 23A or 23A
B collides with the mold.

As described above, the mold and the clamping devices 23A, 2
In order to avoid collision with 3B, the clamping devices 23A,
Before the 23B enters the dead zone DZ, the punch P needs to be avoided at the position of the second top dead center above the normal first top dead center.

In order to detect the dead zone DZ, the turret punch press 1 has an X-axis dead zone detecting section 43 for detecting a dead zone in the X-axis direction as shown in FIG. Y to detect dead zone in direction
An axis dead zone detector 45 is provided.

More specifically, the X-axis dead zone detector 4
Reference numeral 3 denotes a hardware (mechanical) detection device for detecting the X-axis dead zone. As shown in FIG.
The X-axis DZ dog is positioned at a position corresponding to the X-axis direction of the entire length of the carriage base 33 in the X-axis direction by an amount Xd corresponding to the die diameter of the punch P and the die D below the ram 15 at the punching position K in the X-axis direction. 47 are provided.

The clamp devices 23A and 23B are provided with, for example, an X-axis LS49 (limit switch) as an X-axis DZ sensor for detecting the X-axis DZ dog 47 at both widths in the X-axis direction. . Note that this X axis L
S49 functions as an X-axis dead zone detection unit 43 that detects that the clamp devices 23A and 23B have entered the dead zone in the X-axis direction when the X-axis DZ dog 47 is detected, and is shown in FIG. Control device 3
5 is electrically connected.

The X-axis DZ sensor may be another sensor such as a proximity sensor in addition to the X-axis LS49.

The Y-axis dead zone detecting section 45 detects the Y-axis dead zone by software-based detecting means.
The control device 35 is provided as shown in FIG.

More specifically, a Y-axis encoder 51 for detecting the rotation of the Y-axis servomotor 27 is electrically connected to the Y-axis servomotor 27 as shown in FIG. The detected amount of the Y-axis encoder 51 is transmitted to the control device 35 to measure the moving distance of the carriage base 33 in the Y-axis direction.
The positions of the 3A and 23B in the Y-axis direction are detected.

As shown in FIG. 2, the clamp devices 23A, 23 at the original position of the carriage base 33 are provided.
For example, a set distance Yd as a moving distance setting range from the position 3B to the die at the punching processing position K is stored in advance in a memory 53 described later as a parameter setting.
Therefore, in the Y-axis dead zone detection section 45, when the distance that the carriage base 33 has moved in the Y-axis direction from the original position toward the punching processing position K exceeds the above-described set distance Yd, the clamp devices 23A and 23B perform Y Intrusion into the dead zone in the axial direction is detected.

Referring to FIG. 4, the control unit 35 includes a memory 53, a program execution unit 55, a dead zone control unit 57, the aforementioned Y-axis dead zone detection unit 45, and a dead zone / program block storage unit. 59 and X, Y
It comprises an axis control section 61 and a ram control section 63.

In the memory 53, for example, data such as material, plate thickness, punching shape, and die information to be used are inputted and stored from an input device (not shown) as punching processing information, or the same processing in one lot production processing is performed. The punching state of the first work W of the program is stored.

The program execution unit 55 determines whether the first workpiece W or the second workpiece W to be processed by the same processing program in one lot production processing and gives an instruction to execute the processing program. .

In the case of processing the first workpiece W, the dead zone control unit 57 determines the X based on information from the X axis dead zone detection unit 43 and the Y axis dead zone detection unit 45.
It is determined that the clamp devices 23A and 23B have entered the dead zone DZ when entering the dead zone in both the axial direction and the Y-axis direction. Based on this determination, the punch is reliably moved to the position of the second top dead center. A command to perform an interference prevention process between the mold and the clamp devices 23A and 23B so as to be raised is given to the program execution unit 55.

In the case of processing the second and subsequent workpieces W, an instruction for performing the above-described interference prevention processing is given to the program execution unit 55 based on information stored in a dead zone / program block storage unit 59 described later. give.

In the dead zone program block storage section 59, when it is detected that the dead zone control section 57 has entered the dead zone DZ during processing of the first workpiece W, the dead zone program block at this time is stored. It is something that is memorized.

The X and Y axis control section 61 gives a command to the X axis servo motor 41 and the Y axis servo motor 27 to control the positioning of the X axis and the Y axis based on the command from the program execution section 55. Things.

In the ram control unit 63, the program execution unit 5
The ram 15 is controlled based on a command from the ram 15. In the interference prevention process, a command is given from the dead zone control unit 57 via the program execution unit 55, and the ram 15 is controlled in response to the command.

The operation of the above configuration will be described with reference to the flowchart of FIG.

The program execution unit 55 determines whether the current machining is being started with a completely new program or the same machining program has been machined before, and the current machining is executed with the same program. A determination is made as to whether or not the second and subsequent sheets are being processed continuously.

The determination as to whether or not the processing is the first processing is as follows.

The conditions for determining the start of the first sheet processing are as follows:
When the power of the control device 35 is turned on, (2) the emergency stop state is entered, and then the emergency stop state is released, (3) when the mode is set to a mode other than the memory mode, and (4) when the program number is searched in the memory mode. Search for a completely new program, a completely different product).

The condition for determining the end of the first sheet processing is that the actual processing is performed in the memory mode determined to be the start of the first sheet processing, and a signal indicating the end of the program or the end of the tape of the program is output (however, Except when the power switch is turned off) (step S1).

In the processing of the first sheet, the X-axis dead zone detector 43 and the Y-axis dead zone detector 45 detect that the clamp devices 23A and 23B have entered the dead zone DZ (step S2).

If no entry into the dead zone DZ is detected, the processing of the first sheet is terminated, and step S
9 (steps S3 and S9).

When it is detected that the program has entered the dead zone DZ, a command is given from the dead zone control unit 57 to the program execution unit 55, and the program execution unit 55
From the mold and the clamp device 23A by the ram control unit 63,
23B interference prevention processing is executed (steps S3 and S4).

Further, the dead zone program block storage section 59 stores a dead zone program block when the clamp devices 23A and 23B enter the dead zone DZ (step S5).

While the carriage 37 moves from the position indicated by the solid line to the position indicated by the two-dot chain line as shown in FIG. 5, when the clamp device 23A on the left side passes through and escapes from the dead zone DZ in FIG. , Dead zone control unit 5
7, a command is given to the ram control unit 63 via the program execution unit 55 to cancel the interference prevention processing between the mold and the clamp devices 23A and 23B, and the process proceeds to step S9 (steps S6, S7, S8, S9). .

When the clamp devices 23A and 23B stop in the dead zone DZ, the press operation is not performed (steps S6 and S10).

However, whether or not punching is possible is visually determined by the operator. For example, even if the tip of the clamp device 23A or 23B rides on the die D as shown in FIG. Has not yet arrived and the punching is barely possible, the press machine (turret punch press 1) is operated to continue the punching, and the process proceeds to step S9 (step S11).
And S12, S9).

On the other hand, when the operator visually determines that the punching is impossible, the punching is executed again (steps S11 and S13).

In step S9, if the machining program has not been completed, the process returns to step S1 and the program executing section 55 determines whether or not the first workpiece W is to be machined.

In the case of processing the second and subsequent workpieces W, the dead zone control section 57 makes a determination based on the information stored in the dead zone / program block storage section 59, and determines the first workpiece. In the dead zone program block when the intrusion of the dead zone DZ is detected during the machining of W, the die and the clamping device 23A,
23B is executed.

In other words, in the machining of the second and subsequent works W, the machining program is executed in a state where the data at the time of machining the first work W is reflected in the machining program as a dead zone program block. The interference prevention processing is executed by software. That is, in the processing of the second and subsequent workpieces W, the X-axis dead zone detection unit 4
3 and the Y-axis dead zone detection unit 45 does not perform the interference prevention processing based on the dead zone detection.
The hardware (mechanical) erroneous detection of the shaft dead zone detection unit 43 does not occur. As a result, the mold and the clamping device 23
A situation in which the A, 23B interferes (collides) is avoided.
(Steps S14 and S15).

The present invention is not limited to the above-described embodiment, but can be embodied in other forms by making appropriate changes. In the example of the present embodiment, a turret punch press has been described as an example of a punch press, but other punch presses may be used.

[0060]

As will be understood from the above description of the embodiments of the present invention, according to the first aspect of the present invention, in the processing of the second and subsequent workpieces, the processing of the first workpiece is performed. Since the data is executed as a dead zone program block and the machining program reflected in the machining program is executed,
The interference prevention processing can be executed by software. Therefore, it is possible to reliably prevent interference between the mold and the clamp device due to hardware (mechanical) erroneous detection of a dead zone in the X-axis direction as in the related art.

According to the second aspect of the present invention, the effect is the same as that of the first aspect, and in the processing of the second and subsequent workpieces, the data at the time of processing the first workpiece is stored as a dead zone program block. Since the machining program reflected in the machining program is executed, the interference prevention processing can be executed by software. Therefore, it is possible to reliably prevent interference between the mold and the clamp device due to hardware (mechanical) erroneous detection of a dead zone in the X-axis direction as in the related art.

[Brief description of the drawings]

FIG. 1 is a flowchart of a dead zone processing method according to an embodiment of the present invention.

FIG. 2 is a plan view of a turret punch press used in the embodiment of the present invention.

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 an explanatory diagram of a state when the clamp device passes through a dead zone.

FIG. 6 is an explanatory diagram of a state in step 11 of the flowchart in FIG. 1;

FIG. 7 is an explanatory view of a state in which a clamping device in a conventional turret punch press passes through a dead zone.

FIG. 8 is an explanatory view of a state in which a clamping device in a conventional turret punch press interferes with a mold.

[Explanation of symbols]

 Reference Signs List 1 turret punch press 11 upper turret 13 lower turret 15 ram 21 work moving positioning device 23A, 23B clamping device 35 control device 27 Y-axis servo motor (Y-axis feed mechanism) 33 carriage base 37 carriage 41 X-axis servo motor (X-axis) Feed mechanism) 43 X-axis dead zone detection unit 45 Y-axis dead zone detection unit 47 X-axis DZ dog 49 X-axis LS 51 Y-axis encoder 53 memory 55 program execution unit 57 dead zone control unit 59 dead zone / program block storage unit 61 X, Y axis control unit 63 Ram control unit

Claims (2)

[Claims] 1. A work clamped to the clamp device is moved by a punch press by moving a carriage base in the Y-axis direction and moving a carriage provided with a clamp device in the X-axis direction with respect to the carriage base. When performing machining by positioning in a machining section made of a mold, when machining the first work piece of the same machining program, the X-axis direction of the dead zone corresponding to the X-axis and Y-axis directions of the machining section is set to X. The dead zone is detected by the axis dead zone detecting section and when the Y-axis direction of the dead zone exceeds a preset moving distance setting range of the carriage base, the X axis is detected.
A dead zone program block when both dead zones in both the axial direction and the Y-axis direction are detected is stored in a memory, and when the second and subsequent workpieces are processed, a program including the dead zone detected during the processing of the first sheet is stored. A method for treating a dead zone in a punch press, wherein a process for preventing interference between a mold and a clamp is performed by a block. 2. In a punch press, a carriage provided with a clamp device is movably provided in a X-axis direction on a carriage base movably provided in a Y-axis direction, and a workpiece clamped by the clamp device is positioned and processed. A processing section provided with a mold for performing the processing is provided, and a dead zone is provided in a region corresponding to the processing section in the X-axis and Y-axis directions of the punch press, and the clamp device has entered the X-axis direction of the dead zone. An X-axis dead zone detecting unit for detecting that the clamp device has entered the Y-axis direction of the dead zone when the distance exceeds a preset moving distance setting range of the carriage base. A zone detection unit is provided, and when processing the first work piece of the same processing program, the dead zone is detected by both the X-axis dead zone detection unit and the Y-axis dead zone detection unit. A memory for storing a dead zone program block when a zone is detected is provided,
When machining the second and subsequent workpieces, a dead zone control unit is provided which gives a command to perform an interference prevention process between the mold and the clamp device in a program block including the dead zone detected during the first workpiece machining. Dead zone processing device in a punch press.