JPH04240048A - Display method for tool correction scope of numerical control machine tool and device thereof - Google Patents

Abstract

PURPOSE:To improve operability and to shorten an arrangement time, by displaying only the offset information of a tool stored and held in an execution program in a scope. CONSTITUTION:A display device 3 for displaying a tool correction quantity, etc., is provided on a numerical control unit. Only the tool correction quantity concerning the tool which is used for working now or to be used from now on is displayed exclusively on this display device 3 with its reading as a tool information by a memory 12 from the work program in a film 11 on the tool correction scope for displaying the tool correction quantity.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is based on numerical control (hereinafter referred to as N
C) It relates to a method and device for displaying a tool correction screen of a machine tool. More specifically, the present invention relates to a method and apparatus for displaying a tool correction screen of a numerically controlled machine tool that extracts and displays only the tool correction amount of the tool being used.

0002

2. Description of the Related Art Tools used in NC machine tools wear out the tip of the cutting edge depending on the amount of cutting. Wear of the cutting edge of the tool causes dimensional errors in the machined workpiece. In order to avoid this dimensional error, the operator should measure the dimensions of the workpiece using a measuring device such as a micrometer.
The tool compensation amount is entered manually. In order to automatically input the tool correction amount, it is known and used that a touch sensor is provided, and the tool correction amount is calculated by applying the cutting edge of the tool to the touch sensor and automatically inputting the tool correction amount.

[0003] This tool correction amount specifically includes a correction amount in each axial direction, a nose R correction which is the radius of the cutting edge of the tool,
This is the C correction which is a control point. These correction data are written and stored in the tool's correction file. This correction data is called up and displayed on the screen of the NC device as necessary to correct or confirm the data (
Figure 5). These tool correction values are displayed for each axis when called up on the screen and in the order of predetermined tool numbers.

Normally, the tool surface number, that is, the turret surface number and the tool correction number are associated, and the currently indexed tool is displayed with a cursor. Therefore, when the tool post is rotated, the cursor also moves according to each tool surface number.
The position is automatically switched and the tool correction amount is input. On the other hand, the machining program used for machining includes
In the case of an NC lathe, the surface of the turret turret is actually selected. Specifically, the tool attached to the turret surface is selected.

[0005] If the type is equipped with an automatic tool changer and a tool magazine, the group number of the tool is specified. Although the tool number and correction data of the tool specified in the program and used for machining cannot be used to modify the tool correction amount, the data can be checked by calling them on various standard screens prepared in advance. These screens include a machining program content display screen for displaying the contents of the machining program, a position display screen for the tool's machine coordinate system, workpiece coordinate system, etc., and a current command content display screen for displaying the contents of commands during operation. be.

[0006]

[Problems to be Solved by the Invention] However, even if an attempt is made to correct the tool correction amount by calling up the standard tool correction screen, the tool used for the machining is not necessarily displayed. For this purpose, the operator sequentially changes the display by operating the page keys and cursor keys on the keyboard, searching for the screen on which the tool correction amount for the target tool is displayed. Since this operation does not correspond to the tool selected on the machining program, it takes time and effort to display the corresponding tool on the screen. This invention was invented based on these technical backgrounds, and achieves the following objects.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for displaying a tool correction screen for an NC machine tool, which allows changing and confirming the amount of tool correction within one screen.

Another object of the present invention is to provide a method and apparatus for displaying a tool correction screen for an NC machine tool that shortens setup work time.

Still another object of the present invention is to provide a method and apparatus for displaying a tool correction screen for an NC machine tool with improved operability.

0010

[Means and operations for solving the above problems] In order to solve the above problems, the present invention takes the following measures.

a. a display device (3) for displaying tool compensation amount, etc.; b. a program memory file (11) that stores multiple machining programs for machining a predetermined workpiece, such as a tool path of a machine tool and a machining process; c. an execution program memory (12) for reading and storing a machining program currently being used for machining or to be used in the future from the program memory file (11); d. an offset memory table (13) for storing tool compensation amounts for all tools used in machining; e.
an execution program offset table (14) for reading and storing the tool correction amount for only the used tool read from the execution program memory (12) from the offset memory table (13); f. This is a display device for a tool correction screen of a numerically controlled machine tool, which is comprised of a central processing unit (1) for controlling and calculating the respective files, memories, table data, and programs in an integrated manner.

0012

[Function] This invention employs the above means and has the following effects. a. a machine tool body; b. a numerical control device for machining a workpiece by commanding the tool path etc. using numerical information to the machine tool body; c. A numerically controlled machine tool comprising a display device provided in the numerical control device and for displaying tool correction amount, etc., d. Numerical control that reads tool information from the machining program and exclusively displays only the tool compensation amount for the tool that is currently being used for machining or will be used in the future on the tool compensation screen for displaying the tool compensation amount on the display device. This is a method of displaying the tool correction screen of a machine tool.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a functional block diagram of a system for displaying a tool correction screen for an NC machine tool according to the present invention. The CPU 1 is a central processing unit that controls the entire system. The CRT 3 is a display device for displaying various data, programs, and the like. The keyboard 4 is a board provided with a group of keys for inputting and modifying data such as tool correction amounts, programs, and the like.

The NC system ROM 5 stores a system program for driving the entire NC device. The PC system ROM 6 stores a program for driving a programmable controller, that is, a stored program type sequence control device. The NC servo ROM 7 stores a program for driving and controlling a servo mechanism such as moving a tool rest.

The main spindle control ROM 8 controls the stop, normal rotation, and rotation of the main spindle.
Programs for reverse rotation and rotation speed change control are stored in memory. The spindle control calculation section 9 performs calculations for angle indexing and positioning of the spindle. The additional axis control unit 10 is a control circuit for the A and C axes, which are rotary movements or turning operations around the X and Z axes. Normally,
Used for rotating tables, etc. The program memory file 11 stores and holds a plurality of machining programs. Execution program memory 12
The machining program is stored and held in order to execute the machining program.

The offset memory table 13 stores correction amounts in each axis direction, nose radius correction, control points, etc. for each tool. The execution program offset table 14 is stored by reading the machining program in the execution program memory 12 and extracting information about only the tools used in the machining program, as will be described later. Further, information regarding the tool correction amount read from the offset memory table 13 is written in the execution program offset table 14.

The NC function calculation section 15 is a calculation means that performs calculations for issuing commands corresponding to tool paths, work steps necessary for machining, etc. using numerical information. The servo control unit 16 is a control circuit that applies command pulses to the X- and Z-axis motors to control the rotational speed and amount of rotation, and performs desired linear interpolation, circular interpolation, etc. The output from the servo control section 16 is given to an X-axis servo motor 19 and a Z-axis servo motor 20 via servo amplifiers 17 and 18. The rotation speed of the X-axis servo motor 19 and the Z-axis servo motor 20 is
The servo control section 16 is controlled by the pulse generators 21 and 22.
will be given feedback.

Operation [0018] The operation of the system will be explained below using a specific example of a machining program.

[0019]

[Table 1] Table 1 shows an example of a machining program. In this machining program example, T01, T02, T03, T0
It can be seen that a total of 5 wires, 6 and T10, are used. FIG. 2 is a flowchart showing the flow of screen display when the offset screen is selected. When the screen is automatically or manually switched to the all offset screen, the entire tool offset is displayed for each tool, that is, in order of tool surface number. If this entire offset screen is not needed, press the next screen selection key. By using this selection key, information in the execution program offset table 14 is displayed on the screen (Fig. 4
screen).

This display is displayed by the operation shown in FIG. First, information about only the tool in the execution program memory 12 is read and written to the execution program table 14. Further, the tool correction amount is taken out from the offset memory table 13 and written into the execution program offset table 14. These written tool data are arranged in order of tool surface number and displayed on the screen. This screen extracts and displays only the offset information of the tool currently being executed, so there is no extra information. Additionally, for simple workpieces or cutting, tool compensation amounts can be checked and corrected on just one screen. Furthermore, if another offset screen is required, pressing the selection key will display the work shift offset screen.

This work shift amount is determined by adjusting the cutting edge position of the reference tool at the starting point (machine origin) to the machining origin (X0, Z0) before performing tape check or machining in programmed operation.
) indicates how far away you are from (distance). Furthermore, when another offset screen is required, it can be switched to the automatic measurement offset screen. This offset screen for automatic measurement allows the tool correction amount to be automatically input when the tool cutting edge is brought into contact with the touch sensor. When the turret tool post is rotated, the cursor on the automatic measurement offset screen also moves automatically.

[0022]

[Other Embodiments] In the above-mentioned embodiments, the offset screen is displayed on one screen in principle, but when there are many tools, the offset screen may be displayed on two or more screens. Furthermore, the layout and data content of the screen may be changed as necessary.

[0023]

According to the present invention, since only the tool offset information stored in the execution program is displayed on the screen, operability is improved and setup time is shortened.

[Brief explanation of the drawing]

FIG. 1 is a system block diagram showing a tool screen display system for an NC machine tool.

FIG. 2 is a flow diagram outlining the order of offset screen display.

FIG. 3 is a flow diagram showing an operation for displaying information of an execution program offset table.

FIG. 4 is a diagram showing an example of an offset screen of the present invention.

FIG. 5 is a diagram showing columns of a conventional offset screen.

[Explanation of symbols]

1...Central processing unit 3...Display screen 11...Program memory file 12...Execution program memory 13...Offset memory table

Claims (2)

[Claims] [Claim 1] a. a machine tool body; b. a numerical control device for machining a workpiece by commanding the tool path etc. using numerical information to the machine tool body; c. A numerically controlled machine tool comprising a display device provided in the numerical control device and for displaying tool correction amount, etc., d. Numerical control that reads tool information from the machining program and exclusively displays only the tool compensation amount for the tool that is currently being used for machining or will be used in the future on the tool compensation screen for displaying the tool compensation amount on the display device. How to display the tool compensation screen of a machine tool. [Claim 2] a. a display device (3) for displaying tool compensation amount, etc.; b. a program memory file (11) that stores multiple machining programs for machining a predetermined workpiece, such as a tool path of a machine tool and a machining process; c. an execution program memory (12) for reading and storing a machining program currently being used for machining or to be used in the future from the program memory file (11); d. an offset memory table (13) for storing tool compensation amounts for all tools used in machining; e.
an execution program offset table (14) for reading and storing the tool correction amount for only the used tool read from the execution program memory (12) from the offset memory table (13); f. A tool correction screen display device for a numerically controlled machine tool, comprising a central processing unit (1) for centrally controlling and calculating the files, memories, table data and programs.