JPH03166609A - Working path plotting system - Google Patents

Abstract

PURPOSE:To constitute the system so that the motion of a tool can be checked at a glance even if it is superposed on a tool path brought to picture plotting once by adding not only the tool path but also a mark for showing the present position and a mark for showing an end point of a moving command to working picture plotting. CONSTITUTION:A display screen 1 displays plotting during the working of a numerical controller, and a work 2 is an object to be worked, which is fixed by a chuck 3. A tool path 5 shows a path through which a tool 4 moves, and a mark M1 and a mark M2 show the present position of the tool 4 and an end point of executing a program block, respectively. When the execution of the program block is completed, it moves to an end point of the next program execution. In this regards, the mark M1 for showing the present position, the mark M2 for showing the end point, and the tool path 5 are plotted, in each different color, and especially, the colors of the mark M1 and the mark M2 can be set by a parameter. In such a way, from the present position of the tool and the end point of the moving command of the tool, etc., a moving state of the present tool and their motion can be judged.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a machining path drawing method in a display device of a numerical control device, and in particular, the current position of a tool and machining method when the tool passes through the same machining path several times. This invention relates to a machining path drawing method for drawing the end point of a machining path.

[Conventional technology]

In the drawing during machining of conventional numerical control devices, when a block of a machining program is executed, the movement status of a tool is drawn as a tool path on a CRT screen. The machining program was checked based on the tool movement status.

[Problem to be solved by the invention]

However, in the machining path drawing method of conventional numerical control devices, only the tool path is drawn on the CRT screen during drawing during machining, so if a movement command block overlaps the drawn tool path, The current position of the tool could not be confirmed on the screen. Therefore, it was necessary to check the coordinate position of the tool on the position screen, etc. while viewing the drawing during machining.

Furthermore, in drawing during processing, it was not possible to confirm where the end point of the movement command would be.

The present invention has been made in view of these points, and it is an object of the present invention to provide a machining path drawing method that can draw the tool position during machining and the end point of machining on a display device of a numerical control device.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a machining path drawing method in which a tool passes through the same machining path multiple times on a display device of a numerical control device. A machining path drawing method is provided, characterized in that the end point of a moving block is drawn, and the current position is drawn so as to move as the tool moves.

[Effect]

In the drawing during machining of the numerical control device, when blocking the tool movement command, mark the current position and end point of the tool on the CRT.
Draw on the screen. When the block is executed, the mark at the current position moves toward the end point in accordance with the drawing of the tool path.

By marking these two points on the CRT screen, the current position and end point of the tool can be easily grasped.

〔Example〕

FIG. 2 is a block diagram of the hardware of a numerical control device (CNC) for implementing the machining path drawing method of the present invention. In the figure, 10 is a numerical control device (CNC). The processor 11 is a processor that plays a central role in controlling the entire numerical control device (CNC) 10, and reads out a system program stored in the ROM 12 via the bus 21, and according to this system program, the numerical control device (CNC) Execute overall control. RAM13 has DR
AM is used to store temporary calculation data, display data, etc. The CMOS 14 stores tool correction amounts, pitch error correction amounts, NC programs, parameters, and the like. The CMOS 14 is backed up by a battery (not shown) and serves as a non-volatile memory even when the power of the numerical control device (CNC) 10 is turned off, so its data is retained as is.

The interface 15 is an interface for an external device 31, and is connected to an external device 3l such as a paper tape reader, a paper tape puncher, or a paper tape reader/puncher.

An NC program is read from the paper tape league, and a processing program edited in the numerical control device (CNC) 10 can be output to the paper tape puncher.

PMC (7'logrammable machine controller)
16 is built into the CNCIO and controls the machine side using a sequence program created in a ladder format. That is,
According to the M function, Sa function, and T function commanded by the machining program, these are converted into necessary signals on the machine side using a sequence program, and the signals are output from the I/O unit 17 to the machine side.

This output signal drives a magnet, etc. on the machine side, and operates a hydraulic valve, a pneumatic valve, an electric actuator, etc. It also receives signals from the IJ mitt switch on the machine side, switches on the machine operation panel, etc., performs necessary processing, and sends the signals to the processor 11.

The graphic control circuit 18 converts digital data such as the current position of each axis, alarms, parameters, and image data into image signals and outputs the image signals. This image signal is CRT/MD
It is sent to the display device 26 of the I unit 25, and the display device 26
will be displayed. The interface 19 receives data from the keyboard 27 in the CRT/MDI unit 25,
Pass it to processor l1.

Interface 20 is connected to and receives pulses from manual pulse generator 32 . A manual pulse generator 32 is mounted on the machine operation panel and is used to manually precisely position the moving parts of the machine.

Axis control circuits 41 to 44 receive movement commands for each axis from the processor 1l, and transmit commands for each axis to servo amplifiers 51 to 54.
Output to. The servo amplifiers 51 to 54 receive this movement command and drive the servo motors 61 to 64 for each axis. The servo motors 61 to 64 have a built-in pulse coder for position detection, and a position signal is fed back from the pulse coder as a pulse train. In some cases, a linear scale is used as a position detector.

Further, by converting this pulse train into F/V (frequency/velocity), a velocity signal can be generated. In the figure, these position signal feedback lines and velocity feedback are omitted.

Here, the servo motors 61 and 62 control the tool rest A,
Servo motors 63 and 64 control the tool post B.

The spindle control circuits 71 and 72 receive spindle rotation commands, spindle orientation commands, etc.
A spindle speed signal is output to spindle amplifiers 81 and 82. The spindle amplifier 82 receives this spindle speed signal and rotates the spindle motors 9l, 92 at the commanded rotational speed. The spindle motor 91 has a main shaft A
The spindle motor 92 is connected to the main shaft B with gears or a belt.

Position coders 101 and 102 are connected to the spindle motors 91 and 92 by gears or belts. Therefore, the position coders 101 and 102 rotate in synchronization with the main shafts A and B and output feedback pulses, which are read by the processor 11 via the interface 110. This feedback pulse is used to move the tool rest A or tool rest B in synchronization with the spindle motors 91 and 92 to perform processing such as thread cutting. Although FIG. 2 shows numerical control for a four-axis lathe, the structure is basically the same for numerical control for machining centers.

FIG. 1 is a display screen of a numerical control device showing one embodiment of the present invention. In the figure, a display screen 1 represents the drawing during processing of the numerical control device. The work 2 is a workpiece and is fixed by a chuck 3.

Tool path 5 indicates the path along which tool 4 has moved, and mark M1
indicates the current position of the tool 4, and mark M2 indicates the end point of program block execution. When the execution of a program block is completed, the program moves to the end point of execution of the next program block.

Two-dimensional coordinates are displayed on the display screen 1 as a means of clearly indicating the positional relationship.

In this embodiment, the program block movement command causes
Tool 4 moves from coordinates (50, 100) to coordinates (200, 1
00), and the current position of the tool 4 is indicated by a mark Ml. Coordinates (200, 100> are the end points of the movement command and are indicated by the mark M2. Once the tool 4 passes through the tool path 5, it is drawn as a solid line, and in the figure, the tool path 5 once the tool 4 passes is a rectangle. It shows that there is.

In addition, a mark M1 indicating the current position, a mark M indicating the end point
2 and the tool path 5 are drawn in different colors, and in particular, the colors of the marks M1 and M2 can be set by parameters.

〔Effect of the invention〕

As explained above, in the present invention, in addition to the tool path, a mark indicating the current position of the tool and a mark indicating the end point of the movement command are added to the numerical control device's drawing during machining, so that the block of the tool movement command is executed. Then, the current position mark moves as the tool path is drawn, allowing you to check the tool movement at a glance, even if it overlaps with the previously drawn tool path.

Even when a single block is stopped or a feed hold is performed, the current state of tool movement and future movement can be determined from the current position of the tool, the end point of the tool movement command, etc. by looking at the screen.

[Brief explanation of the drawing]

FIG. 1 is a display screen for drawing a machining path in an embodiment of the present invention, and FIG. 2 is a block diagram showing the hardware configuration of a numerical value fl and IJ control device for implementing the present invention. M1 ・ ・ Mark M 2 -- Mark 1 ・゜ ・ Display screen 1 1 1 1 1 ~ 4 1 ~ 5 1 ~ 6 1, 7 1, 8 1, 9 2 ・ Work 3 ・ --・・・Chuck 4...--One tool 5 ゜Tool path 1 ・ ・CPU 2゜--ROM 3 ・RAM 4--・-CMO S 4 ゛゜・Axis control circuit 4・- ・・・Servo amplifier 4・......- Servo motor 2 ...... Spindle control circuit 2 ゜゛゜'
Spindle γ motor 2...Spindle motor

Claims (2)

[Claims] (1) In a machining path drawing method when a tool passes through the same machining path multiple times on a display device of a numerical control device, the machining path, the current position of the tool, and the end point of the moving block are drawn on the display device. A machining path drawing method characterized in that the current position is drawn so as to move as the tool moves. (2) The machining path drawing method according to claim 1, wherein the current position of the tool and the end point are drawn in different colors.