JP4521095B2 - Dead zone processing method and apparatus in punch press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dead zone processing method and apparatus in a punch press.
[0002]
[Prior art]
Conventionally, in a turret punch press 101 as a punch press, for example, as shown in FIGS. 7 and 8, a hydraulic press using a die composed of a punch P and a die D mounted on upper and lower turrets 103 and 105 is used. When punching the workpiece W by punching the punch P through the ram 107, the punch P is normally raised slightly above the position where the workpiece W is pressed to improve the hit rate (first top dead center). However, the clamping devices 109A and 109B are located in the X-axis and Y-axis directions corresponding to the die diameter corresponding to the die diameter formed by the punch P and die D under the ram 107 at the punching position K, in other words, in the dead zone DZ. When moved, the clamp devices 109A and 109B collide with the mold.
[0003]
Therefore, when a plurality of workpieces W are machined with the same mold using the same program using the turret punch press 101, in machining the first workpiece W, the clamping device 109A is placed in the dead zone DZ on the X and Y axes. , 109B is configured such that the punch P is 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 clamping devices 109A, 109B. Yes.
[0004]
In order to detect whether or not the clamp devices 109A and 109B have entered the dead zone DZ, they are detected mechanically (hardware) by a sensor in the X-axis direction, and detected in software by parameter setting in the Y-axis direction. Has been.
[0005]
For example, in the X-axis direction, as shown in FIG. 7, the punch P and the die below the ram 107 at the punching processing position K of the turret punch press 101 out of the total length in the X-axis direction on the carriage base 111. An X-axis DZ dog 113 is provided at a position corresponding in the X-axis direction by an amount Xd corresponding to the die diameter of D. The clamp devices 109A and 109B are provided on a carriage 115 that moves on the carriage base 111 in the X-axis direction. These clamp devices 109A and 109B have the above-mentioned X-axis DZ dogs in both widths in the X-axis direction. An X-axis touch sensor 117 for detecting 113 is provided.
[0006]
Accordingly, when the carriage 115 moves in the X-axis direction, the X-axis touch sensor 117 detects the X-axis DZ dog 113, so that it can be understood that one of the clamp devices 109A and 109B has entered the dead zone in the X-axis direction. .
[0007]
In the Y-axis direction, a set distance Yd (parameter setting) from the positions of the clamping devices 109A and 109B to the die at the punching position K in the original carriage base 111 is stored in advance in the memory of the controller. It can be seen that the clamp devices 109A and 109B have entered the dead zone in the Y-axis direction when the distance that the ledge base 111 has moved in the Y-axis direction from the original position toward the punching position K exceeds the set distance Yd.
[0008]
Actually, it is determined that the clamping devices 109A and 109B have entered the dead zone DZ for the first time when they enter the dead zones in both the X-axis direction and the Y-axis direction. By this determination, the punch P is surely raised to the position of the second top dead center before the clamping devices 109A and 109B enter the dead zone DZ.
[0009]
[Problems to be solved by the invention]
By the way, 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, there are a plurality of clamp devices 109A and 109B, and the position of the clamp devices 109A and 109B may be changed on the carriage 115 for structural reasons. Since it is difficult to detect in software as in the case of the direction, it is detected by hardware (mechanical) using the sensor as described above. For this reason, erroneous detection of the sensor may occur. Therefore, if erroneous detection occurs, the mold and the clamp devices 109A and 109B interfere, that is, collide as shown in FIGS. There was a problem.
[0010]
The present invention has been made to solve the above-described problems, and its purpose is to provide a dead zone in a punch press that can reliably prevent interference between a mold and a clamping device due to erroneous detection of a dead zone in the X-axis direction. To provide a processing method and an apparatus therefor.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the dead zone processing method in the punch press according to the present invention according to claim 1 moves the carriage base in the Y-axis direction and moves the carriage provided with the clamping device to the carriage base with respect to the X-axis. When the workpiece clamped by the clamping device is positioned and processed in a punching press mold by moving the workpiece in the direction, the processing portion is processed when the first workpiece is processed in the same processing program. When the X-axis direction of the dead zone corresponding to the X-axis and Y-axis directions is detected by the X-axis dead zone detector, and the Y-axis direction of the dead zone exceeds the preset carriage base moving distance setting range Dead zone program block when detecting both the X-axis direction and Y-axis direction dead zones Stored in memory, during the processing of the subsequent second sheet workpiece, a program block including the dead zone detected at the time of the first sheet processing performs interference prevention processing mold and the clamp, the clamping device is the dead zone Whether it is invading or not is detected in software, and the mold and clamp interference prevention processing based on the detection of the dead zone of the dead zone detector in the X-axis direction and the dead zone detector in the Y-axis direction is not performed. It is characterized by.
[0012]
Therefore, when machining the second and subsequent workpieces, the machining program is executed in a state in which the machining data of the first workpiece is reflected in the machining program as a dead zone program block, and software interference prevention processing is performed. Executed. As a result, since a conventional hardware (mechanical) erroneous detection of the dead zone in the X-axis direction does not occur, the interference between the mold and the clamping device is surely prevented.
[0013]
According to a second aspect of the present invention, there is provided a dead zone processing apparatus for a punch press according to a second aspect of the present invention, wherein a carriage base provided with a clamp device is provided in a punch base so as to be movable in the Y-axis direction. A processing part having a die for positioning and processing a workpiece clamped in the apparatus is provided, and a dead zone corresponding to the processing part is provided in the X-axis and Y-axis directions of the punch press. An X-axis dead zone detection unit for detecting that the clamping device has entered in the X-axis direction of the dead zone is provided so that the clamping device moves beyond the preset carriage base movement distance setting range. Provided with a Y-axis dead zone detection unit that detects intrusion in the direction, when machining the first workpiece of the same machining program, the X-axis A memory for storing a dead zone program block when a dead zone is detected by both the dead zone detection unit and the Y-axis dead zone detection unit is provided, and is detected at the time of the first piece machining when machining the second and subsequent workpieces. It is provided with a dead zone control unit that gives a command to perform interference prevention processing between a mold and a clamp in a program block including a dead zone , and detects whether the clamping device has entered the dead zone in software, The interference prevention process between the mold and the clamp based on the detection of the dead zones of the dead zone detection unit in the X-axis direction and the dead zone detection unit in the Y-axis direction is not performed .
[0014]
Therefore, it is the same as the operation of the first aspect, and in the machining of the second and subsequent workpieces, the machining program in a state in which the machining data of the first workpiece is reflected in the machining program as a dead zone program block. And the interference prevention process is executed in software. As a result, since a conventional hardware (mechanical) erroneous detection of the dead zone in the X-axis direction does not occur, the interference between the mold and the clamping device is surely prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a dead zone processing method and apparatus in a punch press according to the present invention will be described below with reference to the drawings.
[0016]
2 and 3, for example, a turret punch press 1 as a punch press according to the present embodiment is such that both sides of the upper frame 9 are supported by side frames 5 and 7 erected on both sides of the base 3. The frame structure of the aspect is configured.
[0017]
A disk-shaped upper turret 11 provided with various types of punches P is detachably mounted on the lower portion of the upper frame 9. A lower turret 13 facing the upper turret 11 is rotatably mounted on the upper surface of the base 3, and a large number of dies D facing various types of punches P are arranged in an arc shape on the lower turret 13. And it is 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 in the same direction under the control of an appropriate control device such as a numerical control device. Rotate synchronously.
[0018]
A ram 15 (a striking pressure member) is mounted on the lower surface of the upper frame 9 so as to be movable up and down. The ram 15 is connected to a lower end portion of a piston rod 19 of a hydraulic cylinder 17 mounted on the upper frame 9, for example. 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 workpiece W is pressed.
[0019]
The turret punch press 1 is provided with a workpiece movement positioning device 21 for moving and positioning the workpiece W in the front-rear and left-right directions, and the workpiece W is held by the clamping devices 23A and 23B. The workpiece movement positioning device 21 is controlled by a control device to position the workpiece W at an appropriate position between the punch P and the die D.
[0020]
2 and 3, the workpiece movement positioning device 21 is disposed on the front side (lower right side in FIG. 2) of the turret punch press 1. The workpiece movement positioning device 21 is provided with a Y-axis servo motor 27 as a Y-axis feed mechanism and a Y-axis ball screw 29 so as to be movable from the near side to a punching position K on a horizontally installed center table 25. Moreover, the side table 31 is on the left and right sides of the center table 25 in a divided form. A carriage base 33 having a length substantially equal to the entire machine width of the turret punch press 1 is fixed to the outer edge of the side table 31. The Y-axis servomotor 27 is electrically connected to the control device 35 as shown in FIG.
[0021]
By the Y-axis feed mechanism, the side table 31 and the carriage base 33 move in the Y-axis, and the workpiece W clamped by the clamping devices 23A and 23B is positioned in the Y-axis direction.
[0022]
The above-described carriage base 33 is provided with a guide rail (not shown) made of square steel for moving the carriage under the side facing the turret punch press 1, and the side of the carriage base 33 where the guide rail is mounted. A carriage 37 having clamping devices 23A and 23B is provided along the guide rail so as to be slidable in the X-axis direction.
[0023]
An X-axis ball screw 39 penetrating substantially the center of the carriage 37 and provided on the side surface of the carriage base 33 is disposed as shown in FIGS. 2 and 3, and an X-axis servomotor as an X-axis feed mechanism is provided. 41 is driven to rotate. Carriage 37 feeds in the X-axis direction and positions workpiece W in the X-axis direction freely in the length direction of carriage base 33 by rotation of X-axis ball screw 39. The X-axis servo motor 41 is electrically connected to the control device 35 as shown in FIG.
[0024]
Accordingly, after the plate-like workpiece W is positioned between the punch P attached to the upper turret 11 and the die D attached to the lower turret 13, the punch P is lowered by the ram 15 so that the punch P A punching process is performed on the workpiece W by the die D.
[0025]
Next, the X-axis and Y-axis dead zone detection units 43 and 45 (see FIG. 4) constituting a part of the main part of the present embodiment will be described.
[0026]
Referring to FIG. 2, in the case of a hydraulic press, the punch P is usually at the rising end (first top dead center) slightly above the position where the workpiece W is struck to improve the hit rate. When the clamping devices 23A and 23B move to the X-axis and Y-axis direction regions corresponding to the die diameter corresponding to the punch P and die D below the K ram 15, in other words, to the dead zone DZ, the clamping device 23A or 23B collides with the mold.
[0027]
Thus, in order to avoid collision between the mold and the clamp devices 23A and 23B, before the clamp devices 23A and 23B enter the dead zone DZ, the punch P is a second above the normal first top dead center. It needs to be avoided at the top dead center position.
[0028]
In order to detect the dead zone DZ, the turret punch press 1 includes an X-axis dead zone detection unit 43 that detects a dead zone in the X-axis direction as shown in FIG. A Y-axis dead zone detector 45 for detecting a zone is provided.
[0029]
More specifically, the X-axis dead zone detection unit 43 detects an X-axis dead zone with a hardware (mechanical) detection device. As shown in FIG. 2, the carriage base 33 has an X axis corresponding to the die diameter Xd corresponding to the punch P and die D below the ram 15 at the punching position K out of the total length in the X axis direction. X-axis DZ dogs 47 are provided at corresponding positions in the direction.
[0030]
The clamp devices 23A and 23B are provided with, for example, an X-axis LS49 (limit switch) as an X-axis DZ sensor that detects the X-axis DZ dog 47 in both widths in the X-axis direction. The X-axis LS49 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. As shown in FIG. 4, the controller 35 is electrically connected.
[0031]
The X-axis DZ sensor may be another sensor such as a proximity sensor in addition to the X-axis LS49.
[0032]
The Y-axis dead zone detection unit 45 detects the Y-axis dead zone by software detection means, and is provided in the control device 35 as shown in FIG.
[0033]
More specifically, a Y-axis encoder 51 for detecting the rotation of the Y-axis servomotor 27 is electrically connected to the control device 35 as shown in FIG. The detection amount of the encoder 51 is transmitted to the control device 35, whereby the movement distance of the carriage base 33 in the Y-axis direction is measured, and the positions of the clamping devices 23A and 23B in the Y-axis direction are detected.
[0034]
As shown in FIG. 2, for example, a set distance Yd as a moving distance setting range from the position of the clamping devices 23A, 23B at the original position of the carriage base 33 to the die at the punching position K is set as a parameter setting. It is stored in advance in a memory 53 to be described later. Therefore, in the Y-axis dead zone detection unit 45, when the distance that the carriage base 33 moves in the Y-axis direction from the original position toward the punching position K exceeds the set distance Yd, the clamping devices 23A and 23B An intrusion into the axial dead zone is detected.
[0035]
Referring to FIG. 4, the control device 35 includes a memory 53, a program execution unit 55, a dead zone control unit 57, the Y-axis dead zone detection unit 45 described above, a dead zone / program block storage unit 59, An X and Y axis control unit 61 and a ram control unit 63 are included.
[0036]
In the memory 53, for example, data such as material, plate thickness, punching shape, die information to be used, and the like are input and stored from an input device (not shown) as punching processing information, or one of the same processing programs in one lot production processing. The punching state of the first workpiece W is stored.
[0037]
The program execution unit 55 determines whether the workpiece W to be processed with the same processing program in one-lot production processing is the first piece or the second piece or more, and gives a command to execute the processing program.
[0038]
In the dead zone control unit 57, when machining the first workpiece W, both the X axis direction and the Y axis direction are 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 clamping devices 23A and 23B have entered the dead zone DZ when entering the dead zone, and based on this determination, the punch is surely raised to the position of the second top dead center. A command for performing interference prevention processing with the clamping devices 23A and 23B is given to the program execution unit 55.
[0039]
Further, in the case of machining the second and subsequent workpieces W, a command 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 which will be described in detail later.
[0040]
In the dead zone / program block storage unit 59, when the dead zone control unit 57 detects that the dead zone DZ has been entered when the first workpiece W is machined, the dead zone / program block at this time is stored. Is.
[0041]
The X and Y axis control unit 61 gives a command to the X axis servo motor 41 and the Y axis servo motor 27 in order to control the positioning of the X axis and the Y axis based on a command from the program execution unit 55. .
[0042]
The ram control unit 63 controls the ram 15 based on a command from the program execution unit 55. 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 this command.
[0043]
With the above configuration, the operation will be described based on the flowchart of FIG.
[0044]
The program execution unit 55 determines whether the current machining is the first machining with a completely new program, or the same machining program has been machined before, and the current machining continues with the same program. Judgment is made as to whether it is the second or later piece being processed.
[0045]
The judgment as to whether or not the first sheet is processed is as follows.
[0046]
The conditions for determining the first sheet processing are as follows: (1) When the power of the control device 35 is turned on, (2) When the emergency stop state is released and then released, (3) When the mode is set to other than the memory mode, (4) When a program number is searched in the memory mode (when this is done, a completely new program or a completely different product is searched).
[0047]
The condition for determining the end of the first sheet is as follows: Actual processing is performed in the memory mode that is determined to start the first sheet, and the program end or program tape end signal is output. (Excluding when cut off) (step S1).
[0048]
In the first processing, it is detected by the X-axis dead zone detector 43 and the Y-axis dead zone detector 45 that the clamping devices 23A and 23B have entered the dead zone DZ (step S2).
[0049]
When it is not detected that the vehicle has entered the dead zone DZ, the first processing is finished, and the process proceeds to step S9 (steps S3 and S9).
[0050]
When it is detected that the vehicle has entered the dead zone DZ, a command is given from the dead zone control unit 57 to the program execution unit 55. The program execution unit 55 causes the ram control unit 63 to control the molds and the clamping devices 23A and 23B. Interference prevention processing is executed (steps S3 and S4).
[0051]
Further, the dead zone / program block storage unit 59 stores a dead zone / program block when the clamping devices 23A and 23B enter the dead zone DZ (step S5).
[0052]
When the carriage 37 moves from the position of the solid line to the position of the chain double-dashed line as shown in FIG. 5 and the left clamping device 23A passes through the dead zone DZ in FIG. A command is given from the control unit 57 to the ram control unit 63 via the program execution unit 55 to cancel the interference prevention process between the mold and the clamping devices 23A and 23B, and the process proceeds to step S9 (steps S6, S7, S8, S9).
[0053]
When the clamp devices 23A and 23B are stopped in the dead zone DZ, the pressing operation is not performed (steps S6 and S10).
[0054]
However, it is determined by the operator whether or not punching is possible, and for example, even if the tip of the clamping device 23A or 23B rides on the die D as shown in FIG. If the punching process is barely possible, the press machine (turret punch press 1) is operated to continue the punching process, and the process proceeds to step S9 (steps S11, S12, and S9).
[0055]
On the other hand, when the operator visually determines that punching is impossible, the punching is performed again (steps S11 and S13).
[0056]
In step S9, if the machining program has not ended, the process returns to step S1, and the program execution unit 55 determines whether or not the first workpiece W is to be machined.
[0057]
In the case of machining the second and subsequent workpieces W, the dead zone control unit 57 makes a determination based on the information stored in the dead zone / program block storage unit 59 and processes the first workpiece W. In the dead zone program block when the intrusion of the dead zone DZ is detected at times, the interference prevention process between the mold and the clamping devices 23A and 23B is automatically executed.
[0058]
That is, in the machining of the second and subsequent workpieces W, the machining program is executed in a state in which the data at the machining of the first workpiece W is reflected in the machining program as a dead zone program block. Interference prevention processing is executed. That is, in the machining of the second and subsequent workpieces W, the interference prevention processing based on the dead zone detection of the X-axis dead zone detection unit 43 and the Y-axis dead zone detection unit 45 is not performed. A hardware (mechanical) erroneous detection of the zone detection unit 43 does not occur. As a result, a situation where the mold and the clamping devices 23A and 23B interfere (collision) is avoided. (Steps S14 and S15).
[0059]
In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change. In the example of the present embodiment, the turret punch press has been described as an example of the punch press, but other punch presses may be used.
[0060]
【The invention's effect】
As can be understood from the description of the embodiment of the invention as described above, according to the invention of claim 1, in the machining of the second and subsequent workpieces, the data at the time of machining the first workpiece is a dead zone. Since the machining program reflected in the machining program is executed as a program block, the interference prevention process can be executed in software. Accordingly, it is possible to reliably prevent interference between the mold and the clamping device due to causes such as hard (mechanical) erroneous detection of the dead zone in the X-axis direction as in the prior art.
[0061]
According to the invention of claim 2, the effect is the same as that of claim 1, and in the machining of the second and subsequent workpieces, the data when machining the first workpiece is processed as a dead zone program block into the machining program. Since the reflected machining program is executed, the interference prevention process can be executed in software. Accordingly, it is possible to reliably prevent interference between the mold and the clamping device due to causes such as hard (mechanical) erroneous detection of the dead zone in the X-axis direction as in the prior 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 a state explanatory diagram at step 11 in the flowchart of FIG. 1;
FIG. 7 is an explanatory diagram of a state when a clamping device in a conventional turret punch press passes through a dead zone.
FIG. 8 is an explanatory diagram of a state when a clamping device in a conventional turret punch press interferes with a mold.
[Explanation of symbols]
1 Turret punch press 11 Upper turret 13 Lower turret 15 Ram 21 Work movement positioning device 23A, 23B Clamp 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 detector 45 Y-axis dead zone detector 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)

The workpiece clamped on the clamping device is made of a punch press die by moving the carriage base in the Y-axis direction and moving the carriage provided with the clamping device in the X-axis direction with respect to the carriage base. 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 machining unit when machining the first workpiece of the same machining program And detecting when the Y-axis direction of the dead zone exceeds a preset carriage base moving distance setting range, and dead when both the X-axis direction and Y-axis direction dead zones are detected. The zone / program block is stored in the memory, and when processing the second and subsequent workpieces, the dead zone detected during the first processing is included. In program block performs interference prevention processing mold and clamping, the clamping device is said whether invade dead zone software to detect the X-axis direction dead zone detection unit and the Y-axis direction of the A dead zone processing method in a punch press characterized by not performing a process of preventing interference between a mold and a clamp based on detection of a dead zone of a dead zone detector . Die for carrying out machining by positioning a workpiece clamped on the clamping device on a carriage base that is movable in the Y-axis direction in a punch press, with a carriage equipped with a clamping device in the X-axis direction. X is provided to detect the intrusion of the clamp device in the X-axis direction of the dead zone. An axis dead zone detection unit is provided, and a Y axis dead zone detection unit is provided for detecting that the clamping device has entered the Y axis direction of the dead zone when a predetermined carriage base moving distance setting range is exceeded. When detecting the first workpiece of the same machining program, both the X-axis dead zone detector and the Y-axis dead zone detector detect the dead zone. A memory for storing the dead zone program block at the time of machining is provided, and at the time of machining the second and subsequent workpieces, the mold and clamp interference prevention processing is performed with the program block including the dead zone detected at the time of machining the first piece. Provided with a dead zone control unit that gives a command , detects whether the clamping device has entered the dead zone, and detects the dead zone detection unit in the X-axis direction and dead zone detection in the Y-axis direction A dead zone processing apparatus in a punch press characterized by not performing a process of preventing interference between a mold and a clamp based on detection of a dead zone of a part .

Images