JPH08194516A - Interference prevention system for punch press - Google Patents

Abstract

PURPOSE: To surely prevent the interference between a tool and a work in a tool positioning shift mode in a punch press interference prevention system which prevents the interference between a tool and a work holder of a punch press machine. CONSTITUTION: A positioning path arithmetic means 1 calculates a positioning path 9a of a tool 7 based on a command program 2. An interference decision means 3 decides the presence or absence of interference between the tool 7 and a work holder 8 based on the calculated path 9a, the area data 4a stored previously in a data storage means 4 and showing a size range of the tool 7 on a coordinate plane, and the interference area data 4b on the holder 8. When the interference is decided between the tool 7 and the holder 8, an evading path arithmetic means 5 calculates an evading path 9b to evade the interference area of the holder 8 and to shift the tool 7 to a desired position. Then a tool shift control means 6 controls the shift of the tool 7 based on the path 9b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch press interference prevention system for preventing interference between a tool and a work holder in a punch press machine, and more particularly to a punch press interference prevention system controlled by a numerical controller.

[0002]

2. Description of the Related Art Conventionally, when a punch press machine is controlled by a numerical controller to perform punch press working, a safety for protecting an area of the work holder in order to prevent interference between a tool of a punch head and a work holder. A zone is provided in advance so that pressing is not performed when the tool enters this safety zone.

[0003]

SUMMARY OF THE INVENTION With such a technique,
During positioning movement, no alarm is output even if the tool passes the position of the work holder. This is because it is premised that the tool is moved at a position higher than the work holder when positioning the tool. But,
Depending on the specifications of the machine and the thickness of the work, the work holder may be higher than the moving path of this tool. In this case, there is a risk that the two interfere.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a punch press interference prevention system capable of reliably preventing interference with a work holder when positioning a tool. .

[0005]

According to the present invention, in order to solve the above problems, in a punch press interference prevention system for preventing interference between a tool and a work holder in a punch press machine, a tool positioning path is set in accordance with a command program. Positioning path calculating means for calculating, area data storing means for storing area data indicating a range of size of the tool on the coordinate plane and area data of interference of the work holder, the calculated positioning path and the Interference determining means for determining whether or not the tool and the work holder interfere with each other based on each area data, and when it is determined that they interfere with each other, avoid the interference area of the work holder to reach a target position. Avoidance route calculation means for calculating an avoidance route for moving the tool, and moving the tool according to the calculated avoidance route Punch press interference prevention method, characterized in that it comprises a tool movement control means for Gosuru, is provided.

[0006]

The positioning path calculation means calculates the positioning path of the tool according to the command program. Interference determination means
The tool and the work holder interfere with each other based on the calculated positioning path, the area data indicating the size range on the coordinate plane of the tool stored in the area data storage means, and the work holder interference area data. Determine whether to do. When it is determined that the interference occurs, the avoidance route calculation means calculates the avoidance route for avoiding the interference region of the work holder and moving the tool to the target position. The tool movement control means controls movement of the tool according to the calculated avoidance route.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of the function of this embodiment. The positioning path calculation means 1 uses the tool 7 in accordance with the command program 2.
The positioning path 9a is calculated. The interference determination means 3 calculates the positioning path 9a, the area data 4a which is stored in the area data storage means 4 in advance and indicates the size range on the coordinate plane of the tool 7, and the area of interference of the work holder 8. It is determined whether the tool 7 and the work holder 8 interfere with each other based on the data 4b. When it is determined that the interference occurs, the avoidance route calculation means 5 calculates the avoidance route 9b for avoiding the interference region of the work holder 8 and moving the tool 7 to a target position. The tool movement control means 6 controls the movement of the tool 7 according to the calculated avoidance route 9b.

FIG. 2 shows a numerical control device (C
It is a block diagram of the hardware of NC). The processor 21 is the center of control of the entire numerical controller (CNC) 20. This processor 21 is connected to the RO via the bus 34.
The system program stored in M22 is read, and the entire numerical controller 20 is controlled according to this system program. The RAM 23 stores temporary calculation data, display data, and the like.

The CMOS 24 stores a command program for punch press, various parameters, tool correction amount, and the like. The parameters include the state of an avoidance function execution command, which will be described later, and the amount of retreat movement. Also, CM
The OS 24 stores area data indicating the size range of the tool 11 on the coordinate plane and area data of the interference between the work holders 14a and 14b. The CMOS 24 is a non-volatile memory backed up by a battery (not shown). Therefore, even if the numerical controller 20 is powered off, the data in the CMOS 24 is retained as it is.

The interface 25 is an interface for an external device, and is connected to an external device 33 such as a paper tape reader, a paper tape puncher, and a paper tape reader / puncher. The processing program is read from the paper tape reader, and the processing program edited in the numerical controller 20 can be output to the paper tape puncher.

A PMC (Programmable Machine Controller) 26 is built in the numerical controller 20 and controls the machine with a sequence program created in a ladder format. That is, the M function, S function and T of the machining program
According to the command of the function, these commands are converted into a signal necessary for the machine side by the sequence program, and the I / O unit 2
7 to the machine head 10 and other machines. This output signal drives a magnet or the like on the machine side to operate a hydraulic valve, a pneumatic valve, an electric actuator, a mechanical head of a punch press, or the like. Further, it receives signals from a machine-side limit switch, a machine control panel switch, and the like, performs necessary processing, and passes the signals to the processor 21.

The graphic control circuit 28 converts the current position of each axis, alarms, parameters and other various digital data into an image signal and outputs it. This image signal is C
Sent to the display device 31a of the RT / MDI unit 31,
It is displayed on the display device 31a. Interface 29 is C
Input data such as a product number is received from the keyboard 31b in the RT / MDI unit 31 and passed to the processor 21. On the keyboard 31b, the operator issues a permission / prohibition function execution command to be described later. This avoidance function execution command is stored in the CMOS 24, for example, until the command is released. The processor 21 executes the avoidance function described later only when the avoidance function execution command is issued.

The interface 30 is a manual pulse generator 3
2 and receives the pulse from the manual pulse generator 32. The manual pulse generator 32 is mounted on the machine operation panel,
Used to precisely position mechanical moving parts manually.

The axis control circuits 41 and 42 are the processor 21.
In response to the movement command for each axis from, the command for each axis is output to the servo amplifiers 51 and 52. Servo amplifier 51, 52
Drives the X-axis and Y-axis servomotors that respectively control the table 13. A work (material plate) 12 is fixed to the table 13.

The mechanical head 10 is connected to the PMC 26 and the bus 34 via the I / O unit 27. P
The MC 26 receives an I / O command from the processor 21.
A press operation command is issued via the unit 27 to the mechanical head 10.
Send to As a result, the mechanical head 10 operates and the press tool 11 moves up and down.

Next, a specific operation example of the avoidance function by the interference prevention system by the CNC 20 having such a configuration will be described. FIG. 3 is a diagram showing an example of a specific operation of the avoidance function by the interference prevention method of the present embodiment. Here, it is assumed that the center of the tool 11 is at the position of the point P1 and the tool 11 is positioned and moved from here to the point P2 sandwiching the work holder 14a. At this time, when the tool 11 is moved along the positioning path M1 between the points P1 and P2, the area having the size on the coordinate plane interferes with the interference area of the work holder 14a. In this case, the height of the work holder 14a (Z
When the axial direction) is equal to or higher than the height of the path of the tool 11, they collide with each other. In order to avoid this, in this embodiment, the positioning path M1 is decomposed into an X-axis component and a Y-axis component, and avoidance paths L1 and L2 in which the respective components are connected in order are calculated. That is, the avoidance route L1 is in the order of the X axis component and the Y axis component, while the avoidance route L2 is the X axis component,
This is a path that moves in the order of the Y-axis component.

However, here, the avoidance path L2 interferes with the work holder 14a by the movement in the X-axis direction.
Therefore, the actual movement of the tool 11 is performed by the avoidance path L1. That is, the X-axis component of the positioning path M1 is moved first, and then the Y-axis component is moved. Thereby, the interference between the tool 11 and the work holder 14a can be reliably prevented.

FIG. 4 is a diagram showing another example of a specific operation of the avoidance function by the interference prevention method. Here, the tool 11
Is located at the position of the point P3, and the position is moved from here to the point P4 sandwiching the work holder 14a in the X-axis direction. At this time, when the tool 11 is moved along the positioning path M2 between the points P3 and P4, the area occupied on the coordinate plane interferes with the interference area of the work holder 14a. In order to avoid this, it is necessary to calculate the avoidance route as shown in FIG. However, in this case, since the positioning path M2 has only the X-axis component, the avoidance path as shown in FIG. 3 cannot be obtained. Therefore, if the positioning path does not have the Y-axis component, or if the avoiding path cannot sufficiently avoid the work holder 14a even if the positioning path has the Y-axis component, the retracting movement amount set in advance as a parameter is set. The avoidance route is calculated based on this.

That is, first, the tool 11 is moved along the Y-axis direction from the point P3 to the point P5, moved from the point P5 in the X-axis direction by the same amount as the positioning path M2, and from that position along the Y-axis. Move to P4. At this time, point P3
The distance between -P5 is the center of the tool 11 and the work holder 14
It is calculated so that the edge portion of a is separated from the edge portion by the retracting movement amount d1. Interference can be reliably prevented by keeping the distance between the two by the retracted movement amount d1.

FIG. 5 is a flow chart showing a processing procedure on the processor 21 side for executing the avoidance function by the interference prevention method of this embodiment. The flow chart starts when one block of the command program is decoded. [S1] The positioning path to the commanded target position is calculated. [S2] It is determined whether or not the tool 11 interferes with the work holder 14a or 14b by the movement along the calculated positioning path. If the tool 11 interferes with the workpiece holder 14a or 14b, the process proceeds to step S3. [S3] The avoidance route is calculated. [S4] It is determined whether or not there is a route capable of avoiding interference among the calculated avoidance routes.
If not, the process proceeds to step S5. [S5] An avoidance route is calculated based on the amount of retreat movement preset by parameters. [S6] The tool 11 is controlled to move along a path capable of avoiding interference.

As described above, in this embodiment, when the tool 11 interferes with the work holder 14a or 14b by the positioning movement according to the commanded positioning path, the positioning path is decomposed into an X-axis component and a Y-axis component. Since the avoidance path formed by the calculation is calculated and the tool 11 is moved along the avoidance path, the tool 11 and the work holder 14a,
It is possible to reliably prevent interference with 14b.

Further, in the present embodiment, the avoidance path is calculated so that the tool 11 and the work holders 14a and 14b are separated by a preset retreat movement amount, so that interference can be prevented more reliably. it can.

Furthermore, in the present embodiment, the avoidance path is calculated and the movement control is performed only when the avoidance function execution command is issued by the operator, so that the work holders 14a and 14b are moved from the movement path of the tool 11. When there is no risk of interference, such as when the value is low, the normal movement control can be performed, and the processing time can be prevented from becoming long.

[0024]

As described above, according to the present invention, when the tool and the work holder interfere with each other due to the movement of the positioning path, the avoidance path for avoiding the interference area of the work holder and moving the tool to a target position is provided. Since the calculation is performed and the tool is moved according to the avoidance path, it is possible to reliably prevent interference between the tool and the work holder during positioning movement.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of functions of the present embodiment.

FIG. 2 is a block diagram of hardware of a numerical control device (CNC) for implementing the present invention.

FIG. 3 is a diagram showing an example of a specific operation of an avoidance function by the interference prevention method of the present embodiment.

FIG. 4 is a diagram showing another example of a specific operation of the avoidance function by the interference prevention method of the present embodiment.

FIG. 5 is a flowchart showing a processing procedure on the processor side for executing the avoidance function by the interference prevention method of the present embodiment.

[Explanation of symbols]

 1 Positioning Path Computation Means 2 Command Program 3 Interference Judgment Means 4 Area Data Storage Means 4a Area Data (Tools) Area Data 4b (Workpiece Interference) Area Data 5 Avoidance Path Calculation Means 6 Tool Movement Control Means 7 Tools 8 Workholders 9a Positioning path 9b Avoidance path 11 Tool 12 Work 13 Table 14a, 14b Work holder 20 Numerical controller (CNC) 21 Processor (CPU) 24 CMOS

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G05B 19/19 M 19/4061 19/4068 G05B 19/405 Q

Claims (4)

[Claims] 1. In a punch press interference prevention system for preventing interference between a tool and a work holder in a punch press machine, a positioning path calculation means for calculating a positioning path of a tool in accordance with a command program, and on a coordinate plane of the tool. Area data storage means for storing area data indicating a range of magnitudes and area data of interference of the work holder, and the tool and the work holder interfere with each other based on the calculated positioning path and each area data. Interference determination means for determining whether or not to perform, and an avoidance path calculation means for calculating an avoidance path for moving the tool to a target position while avoiding the interference area of the work holder when it is determined to interfere with each other. A tool movement control means for controlling the movement of the tool according to the calculated avoidance path, Punch press interference prevention method. 2. The avoidance route calculation means is configured to use a route obtained by decomposing the positioning route into biaxial components of a coordinate system of movement as the avoidance route. Interference prevention method of punch press. 3. The avoidance route calculation means is configured to calculate the avoidance route so that the tool retracts from the work holder by a preset retract movement amount. The punch press interference prevention method described in 1. 4. An avoidance function execution instruction means for instructing execution of an avoidance function by the interference determination means, the avoidance route calculation means, etc., an execution instruction state storage means for storing an execution instruction state of the avoidance function, and the avoidance. 2. An interference prevention system for a punch press according to claim 1, further comprising: an avoidance function executing means for executing the functions such as the interference determining means and the avoidance path calculating means only when the function is in an execution command state. .