JP2862938B2 - Numerically controlled plate processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a numerically controlled sheet material processing apparatus such as an NC turret punch press apparatus in which a work clamping means for gripping a sheet material is erroneous. TECHNICAL FIELD The present invention relates to a numerically controlled sheet material processing apparatus capable of preventing processing such as punching with a processing tool such as a press die.

(Prior art) In a numerically controlled turret punch press device, etc.,
An area where work clamping means for gripping a plate material as a workpiece enters a processing position by a processing tool such as a press die, and this may be processed by being punched out by the processing tool, that is, an override area. In this case, an override detection means control means for detecting that the work clamp means has entered by a limit switch or the like and automatically stopping the plate material processing operation in such a case is incorporated.

When the plate material processing operation is stopped by the override detection control means, it is determined whether or not the work clamping means is actually processed by the processing tool by visual inspection by an operator, and thereafter, the confirmation switch is operated by the operator. Then, the plate material processing operation is restarted.

(Problems to be Solved by the Invention) In the above-described conventional override detection control, for example, the work clamping means is disposed on a carriage extending in the X-axis direction in the X-axis direction for convenience of work clamping. If the workpiece clamping means moves in the Y-axis direction by a predetermined value or more in the direction approaching the machining position, it is determined that the workpiece clamping means has entered the override area. Since the automatic stop is performed irrespective of the arrangement position of the means in the X-axis direction, the size of the processing tool, and the like, if the automatic stop is performed, the operator can visually check the work clamp means. You have to judge whether or not it is really processed by the processing tool. This determination is a troublesome operation, and since all of the determination depends on visual observation by an operator, there is a possibility that an erroneous determination may occur. There is a risk of being done.

The present invention has been made in view of the above-described inconveniences, and provides a numerically controlled sheet material processing apparatus capable of reliably preventing a workpiece clamping means from being processed by a processing tool without depending on an operator's judgment. It is intended to be.

[Structure of the Invention] (Means for Solving the Problems) In view of the above-described conventional problems, the present invention provides a carriage base movable in the Y-axis direction which approaches and separates from a processing position for processing a plate material. In a numerically controlled plate material processing apparatus provided with a carriage in which a plurality of work clamps for gripping a plate material are mounted so as to be changeable in the X axis direction so as to be movable in the X axis direction, the work clamp in the X axis direction with respect to the carriage is provided. Mounting position change detecting means for detecting the presence or absence of a change in the mounting position; and the work clamp for the carriage when the carriage is moved in the X-axis direction from an origin position on one end of the carriage base to a point O on the other end. A position detection sensor provided near the center of the carriage base in the X-axis direction to automatically detect the mounting position of the carriage base; X of the workpiece clamping against the carriage moves to the O point position said carriage from said home position by the input of a detection signal of the detection means
Whether the workpiece clamp is located at a position where the workpiece clamp interferes with the machining tool based on the coordinate data in the axial direction automatically based on the coordinate data, the machining position numerical information of the machining program, and the information on the size and position of the machining tool. Numerical control means for performing a processing simulation by a numerical operation to determine whether or not to execute the processing program and, when there is interference, prohibiting the execution of the processing program and outputting an error display command to a display means.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 7 shows an example of a numerically controlled turret punch press apparatus suitable for implementing the work clamp damage prevention method according to the present invention. In FIG. 7, reference numeral 1 denotes a frame of a turret punch press apparatus, on which an upper turret disk 3 and a lower turret disk 5 are rotatably mounted. A plurality of punches 7 are mounted on the upper turret disk 3 and a plurality of dies 9 are mounted on the lower turret disk 5, respectively. These punches 7 and dies 9 rotate the upper turret disk 3 and the lower turret disk 5. By being selectively brought directly below the striker 11, the punch press working is performed in cooperation with each other at a position directly below the striker 11. Therefore, the processing position in this turret punch press device is the position directly below the striker 11.

The frame 1 is provided with a carriage base 13 movable in the Y-axis direction in the drawing.
Is provided with a carriage 15 movable in the X-axis direction in the figure. In the illustrated embodiment, a plurality of, in the illustrated embodiment, a plurality of work clamp means 17 are mounted on the carriage 15 so that the mounting positions can be changed in the X-axis direction. The work clamping means 17 is provided with a plate-shaped clamp piece 17a which can enter between the upper turret disc 3 and the lower turret disc 5 in order to enlarge a workable area. The plate material W which is a workpiece is gripped.

As shown in FIGS. 1 and 2, in a turret punch press apparatus for implementing the work clamp damage preventing method according to the present invention, the position of the work clamp means 17 mounted on the carriage 15 in the X-axis direction is detected. The position detection sensor 19 for performing the operation is provided. The position detection sensor 19 is
It is composed of a proximity switch, an optical sensor, a limit switch, and the like, and is fixedly mounted substantially at the center of the carriage base 13 in the X-axis direction.
As the detector 17 moves in the X-axis direction, it is detected that the detector 21 provided on the work clamp means 17 passes in front of the position detection sensor 19, and based on the coordinate data of the work clamp means 17 in the X-axis direction. The attachment position is detected. Therefore, in this case, when detecting the position of the work clamp means 17, the carriage 15 is moved from the origin position (the left end position in FIG. 2) to the zero point position (the right end position in FIG. 2). .

As shown in FIG. 3, a bracket plate 23 is attached to the lower end of the carriage 15 along the direction in which the carriage 15 extends, that is, in the X-axis direction.
On the upper side, a strip-shaped conductor plate 27 is provided via a strip-shaped insulating plate 25 so as to extend in the extending direction of the bracket plate 23, that is, in the X-axis direction, in other words, in the direction of changing the mounting position of the work clamp means 17. ing. Work clamp means
A conductive roller 31 is rotatably mounted on the roller 17 by a conductive roller bracket 29. The roller 31 comes into contact with the conductor plate 27 with a predetermined contact pressure, and the mounting position of the work clamping means 17 with respect to the carriage 15 is adjusted. The contact position with respect to the conductor plate 27 is changed in the X-axis direction in accordance with the change in. The roller 31 is grounded via a roller bracket 29 and a work clamp means 17, whereas a predetermined voltage V is applied to both ends of the conductor plate 27 via a voltage change determination circuit 33.

The voltage change determination circuit 33 serves as a mounting position change detecting means for detecting whether or not the mounting position of the work clamp means 17 with respect to the carriage 15 in the X-axis direction has changed, and includes a general voltage detecting circuit and this voltage detecting circuit. And a voltage change detection circuit for detecting a change in the voltage detected by the control unit, and outputs a signal regarding the presence or absence of a change in the voltage to the numerical controller (CNC) 35.

Since the conductive plate 27 is grounded at the point of contact with the roller 31, the voltage between the two ends of the conductive plate 27 detected by the voltage change determination circuit 33 is determined by the resistance change from the contact position of the roller 31, in other words. The voltage changes according to the mounting position of the work clamp means 17 with respect to the carriage 15 in the X-axis direction, and a change in the mounting position of the work clamp means 17 with respect to the carriage 15 is detected from this voltage change.

FIG. 4 shows a potential difference in the longitudinal direction of the conductor plate 27, that is, a voltage characteristic detected by the voltage change determination circuit 33.

As shown in FIG. 5, the numerical control device 35 is constituted by, for example, a CNC including a microcomputer, and outputs numerical information on the processing position to an X-ray from an operation panel 37 having a keyboard and the like.
Numerical information on the size (outer dimension) of each of a plurality of punches 7 and dies 9 provided on the upper turret disk 3 and the lower turret disk 5 is given as the axis coordinate value and the Y axis coordinate value, Given the information on the turret position, store a machining program according to the information, perform NC control for moving the work clamp means 17 to predetermined positions in the X-axis direction and the Y-axis direction according to the machining program, and perform turret control. It has become.
With this control, the plate material W gripped by the work clamping means 17 is brought to a predetermined position with respect to the processing position, and a predetermined press process is performed on a predetermined position of the plate material W by a predetermined punch 7 and a die 9. Become.

The numerical control device 35 fetches numerical information on the mounting position (arrangement position) of the work clamp means 17 in the X-axis direction from the position detection sensor 19, and the voltage change determination circuit 33 causes the work clamp means 17 to move in the X-axis direction with respect to the carriage 15. Information on the presence / absence of a change in the mounting position of the tool, and based on these information, numerical information on the machining position of the machining program, and information on the size of the punch 7 and die 9 and the turret position (turret number) as machining tool information. And the punch 7 in which the work clamping means 17 is located at a machining position which is a machining tool
Prior to execution of the actual machining program, a machining simulation was performed by numerical calculation to determine whether or not the punching was performed by the die 9 and the die 9. As a result, it was determined that the work clamp means 17 was punched by the punch 7 and the die 9. At times, the execution of the machining program is forcibly prohibited, and this error display command is output to the CRT 39.

The processing simulation as described above may be executed every time the processing conditions are changed. This is, for example, the first processing in the same processing repeatedly, when a reset operation is performed, once from the memory mode. However, it may be performed at least at any one of times when the mounting position in the X-axis direction of the work clamp means 17 is changed by the voltage change determination circuit 33 when it comes out, and an override input provided on the operation panel 37 or the like may be performed. This may be performed when the OFF switch is in the ON state. FIG. 6 is a flow chart showing an example of the procedure for implementing the work clamp damage preventing method in the numerically controlled plate processing apparatus according to the present invention. First, in step S10, it is determined whether or not the execution condition of the machining simulation is satisfied. The execution conditions of the machining simulation are as follows: when the override ON / OFF switch is ON, when it is the first machining in the same repetitive machining, when the reset operation is performed, and even once from the memory mode. At least one of the times when the mounting position of the work clamp means 17 in the X-axis direction is changed by the voltage change determination circuit 33, and in this case, step S20 is executed, and if not, Goes to step S60 to execute a predetermined machining program.

In step S20, the carriage 15 for detecting the mounting position of the work clamp means 17 in the X-axis direction by the position detection sensor 19 is moved from the origin position to the zero point position. Thus, the coordinate data in the X-axis direction of the work clamp means 17 is taken into the numerical controller 35 by the signal from the position detection sensor 19, and the numerical controller 35
Indicates that the mounting position of the work clamp means 17 in the X-axis direction is recognized by numerical information.

Next, in step S30, numerical information on the mounting position of the work clamp means 17 in the X-axis direction, numerical information on the processing position of the processing program, information on the sizes of the punch 7 and the die 9 and their turret numbers are obtained. Based on this, a simulation is performed by a numerical operation to determine whether or not the work clamp means 17 is punched by the punch 7 and the die 9 located at the processing position as the processing tool.

Next, in step S40, it is determined whether or not the work clamping means 17 is punched by the punch 7 and the die 9 by the simulation.
When it is determined that the punching is performed by the punch 7 and the die 9, step S50 is executed. In step S50, the carriage 15 is returned to the home position, and the execution of the machining program is prohibited. In such a step (processing step), it is displayed whether the work clamping means 15 is punched.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to this, and various embodiments can be made within the scope of the present invention. It will be clear to those skilled in the art.

[Effects of the Invention] As can be understood from the above description of the embodiment, in the present invention, the carriage base 13 movable in the Y-axis direction which approaches and separates from the processing position in the plate processing machine.
A plurality of work clamps 17 are mounted on the carriage 15 movably supported in the X-axis direction so as to be changeable in the X-axis direction.
A mounting position change detecting means for detecting whether or not the mounting position in the X-axis direction has changed is provided, and the carriage 15 is moved from the origin position on one end of the carriage base 13 to the O-point position on the other end in the X-axis direction. A position detection sensor 19 is provided near the center of the carriage base 13 in the X-axis direction to automatically detect the mounting position of the work clamp 17 with respect to the carriage 15 when the carriage base 13 is moved.

And a numerical controller 35 for controlling the plate material processing machine.
Receives the detection signal of the mounting position change detecting means, moves the carriage 15 from the origin position to the O point position, and takes in the coordinate data of the work clamp 17 with respect to the carriage 15 in the X-axis direction. Based on the machining position numerical information of the machining program and the size and position information of the machining tool, whether or not the work clamp 17 is located at a position where the machining tool interferes with the machining tool is subjected to machining simulation by a numerical operation. Is configured to inhibit execution of the machining program and output an error display command to the display means 39.

Therefore, according to the present invention, when the mounting position of the work clamp 17 is changed with respect to the carriage 15, it is detected by the mounting position change detecting means, and the carriage 15 is moved from the origin position to the O point position.
The mounting position of the work clamp 17 with respect to is automatically detected, and whether or not the work clamp 17 interferes with the machining tool when the machining program is executed is numerically calculated,
In the case of interference, an error is displayed on the display means, so that it is not necessary for the operator to confirm the error visually, and the work clamp 17 can be prevented from interfering with the processing tool.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a mounting portion of a work clamping means in a turret punch press apparatus used for carrying out a work clamp damage preventing method in a numerically controlled sheet material processing apparatus according to the present invention, and FIG. FIG. 3 is a schematic configuration diagram showing an embodiment of the mounting position detecting means of the work clamp means, and FIG. 4 is a graph showing voltage characteristics detected by the mounting change detecting means shown in FIG. FIG. 5 is a block diagram showing an embodiment of a control system used for implementing the method for preventing damage to a work clamp according to the present invention.
FIG. 7 is a flowchart showing a control flow of the work clamp damage preventing method according to the present invention, and FIG. 7 is a perspective view showing an example of a numerically controlled turret punch press apparatus suitable for implementing the work clamp damage preventing method according to the present invention. . DESCRIPTION OF SYMBOLS 1 ... Frame 3 ... Upper turret disk 5 ... Lower turret disk 11 ... Striker 13 ... Carriage base 15 ... Carriage 17 ... Work clamping means 19 ... Position detection sensor 35 ... Numeric control device

Claims (1)

(57) [Claims] A carriage base (13) movable in a Y-axis direction which approaches and separates from a processing position for processing a plate material.
In a numerically controlled plate processing apparatus provided with a carriage (15) in which a plurality of work clamps (17) for gripping a plate material are mounted so as to be changeable in the X-axis direction and movable in the X-axis direction, The work clamp (1
7) mounting position change detecting means for detecting whether or not the mounting position in the X-axis direction has changed; and moving the carriage (15) from an origin position on one end of the carriage base (13) to a point O on the other end. A position detection sensor provided near the center of the carriage base (13) in the X-axis direction to automatically detect the mounting position of the work clamp (17) with respect to the carriage (15) when moved in the X-axis direction. (19) The carriage (15) is moved from the origin position to the O point position by the input of the detection signal of the mounting position change detecting means, and the work clamp (17) is moved in the X-axis direction with respect to the carriage (15). Automatically captures the coordinate data of the machining tool, and based on the coordinate data, numerical information on the machining position of the machining program and information on the size and position of the machining tool, the work clamp (17) Numerical control means (35) for performing a processing simulation by numerical operation to determine whether or not it is located at an interference position, and in the case of interference, prohibiting execution of the processing program and outputting an error display command to a display means (39). A numerically controlled sheet material processing apparatus, comprising: