KR20010066571A - Off-Set Number Setting Device and Method - Google Patents

Abstract

PURPOSE: A device for setting off-set number and a method the same are provided to ease correction process of tool length by appointing plural tool length off-set number about one tool number. CONSTITUTION: A numerical control construction machine appoints an off-set number each corresponding to plural tool number for corresponding several tools used in specific manufacturing work with plural off-set value due to each tool length of the tools by one to one. An off-set number automatic establishment process appoints an equal off-set number automatically to correspond one to one each about the plural tool number. An off-set number manual establishment process appoints an unequal off-set number from the tool number by hand each about the plural tool number. The manual establishment process is performed by selection after performance of the automatic establishment process and is performed at least once in case of the selection.

Description

Offset Number Setting Device and Method

The present invention relates to the automatic setting of the offset amount according to the tool length of a numerically controlled machine tool, in particular a CNC lathe. More specifically, the present invention relates to an apparatus and method for multiple setting of offset numbers that can designate a plurality of tool length offset numbers for one tool number.

In general, in CNC lathes, it is necessary to accurately set the origin for precise machining of a workpiece. That is, it is required to accurately position the tool on the machining surface of the workpiece.

In particular, when the same workpiece is processed with different types of tools, the length of the tool is different, so the tool length must be corrected each time the tool is changed and processed.

More specifically, referring to FIG. 1, the tool 30 is used by being inserted into the spindle 40, and the workpiece 20 is placed on the bed 10 and processed.

The variables used here include the height Hbs from the bed 10 to the spindle 40, the height Hm of the workpiece, the length Ht of the tool 30 and the offset amount Zoff.

To accurately position the tool on the workpiece surface, data such as tool length (Ht), workpiece height (Hm), and distance between bed and spindle (Hbs) must be measured in advance and stored in the database.

In the process of building a database, there is a process of manually measuring the length of a tool and inputting the measured tool length in the corresponding tool number.

2 shows a tool length offset number setting screen for designating a corresponding offset number for each tool number TOOL NO.

3 is a flowchart illustrating a conventional offset number setting method for designating an offset number on the setting screen of FIG. 2.

To carry out specific machining operations, the operator mounts a plurality of tools on the turret of the CNC lathe. When the installation of the tool is completed, the operator proceeds to the offset number setting process as follows as a previous step for measuring the tool length.

The CRT screen of the CNC device automatically moves to the offset number setting screen as shown in Fig. 2 (step ST1).

When the offset number setting screen is displayed, change the tool to the tool number for which you want to set the offset. (Step ST2)

When the designation of the tool number is completed in this way, the same offset number as the tool number is automatically set, and the cursor on the screen moves to the corresponding offset number. (Step ST3, ST4)

When the movement of the cursor is completed, the tool length is measured manually and the measured value is input to the corresponding offset number (step ST5).

As described above, in the conventional offset number setting device, the offset number corresponding to each tool number is programmed to be automatically set to the same number unconditionally.

Therefore, there is a problem in the related art that the number of offset numbers that can be specified for the tool (eight in FIG. 2) is limited to the number of tools that can be mounted on the turret.

For example, in a CNC lathe equipped with a turret capable of mounting eight tools, there are cases where the number of tools used for machining is required to be 20. In this case, since only eight offset numbers are conventionally assigned, the work must be interrupted during processing and a new offset number must be set. That is, the offset number is set for the tool currently mounted on the turret, and the tool length is measured to obtain the offset amount. After that, only the tool mounted on the turret should be processed, and when the work on the tool attached to the turret is completed, the tool of the turret should be replaced and the offset number reset.

Accordingly, there is a need for an offset number setting device and method capable of designating a plurality of offset numbers for one tool number regardless of the number of tools mounted on the turret.

An object of the present invention is to allow the operation to continue even by replacing the tool mounted on the turret without having to reset the offset number in a complicated machining operation.

Another object of the present invention is to provide an offset number setting device and a method capable of setting a plurality of offset numbers for one tool number.

One aspect of the present invention for achieving this object is to provide a 1: 1 correspondence between a plurality of tools used in a specific machining operation and a plurality of offset amounts attributable to the tool length of each of the tools. An offset number setting device of a numerically controlled machine tool for designating a corresponding offset number, the first mode in which the offset number setting device can designate only one offset number that is the same for one tool number, and for one tool number. A mode selection switch having a second mode capable of designating a plurality of offset numbers that are the same or different, and for selecting only one of the first and second modes; A numbering switch for directly designating a desired offset number for a specific tool number in the state in which the second mode is selected; A control unit for performing a first mode and a second mode, and in particular, setting an offset number input by the numbering switch to a corresponding tool number when the second mode is selected; And a display device for displaying the tool number and the offset number specified by the control unit.

In another aspect of the present invention, an offset number setting method is provided for each of a plurality of tool numbers in order to correspond 1: 1 to a plurality of tools used in a specific machining operation and a plurality of offset amounts due to the tool length of each of the tools. A numerically controlled machine tool for designating a corresponding offset number, comprising: an offset number automatic setting step for automatically designating a same offset number so as to correspond 1: 1 to each of a plurality of tool numbers; An offset number manual setting step for manually designating an offset number different from this tool number for each of the plurality of tool numbers; The manual setting step is executed according to the selection after the automatic setting step is performed, and if the manual setting step is executed by selection, it is executed at least once.

In addition, when the manual setting step is executed two or more times, the offset numbers assigned to the same tool numbers are different from each other.

Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the appended claims.

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate the presently preferred embodiments of the invention and, together with the description of the following preferred embodiments, serve to explain the principles of the invention.

1 is a schematic diagram for explaining an offset value according to a tool length.

2 is an offset number setting screen for explaining a conventional offset number setting state.

3 is a flowchart for explaining a conventional offset number setting method.

4 is a block diagram of an offset number setting apparatus of the present invention.

5 shows an offset number setting screen of the present invention.

6 is a flowchart for explaining the offset number setting method of the present invention.

<Description of the symbols for the main parts of the drawings>

100: CPU 110: RAM

120: ROM 130: key input unit

140: I / O unit 150: machine tool

151: mode selection switch 152: number input switch

153: warning lamp 154: machine control panel

160: display device 170: position control device

171: servo control unit 172: servo motor

Hereinafter, specific examples of the offset number setting device and method of the present invention will be described with reference to FIGS. 4 to 6.

First, the offset number setting device of the present invention will be described with reference to FIGS. 4 and 5.

As shown in FIG. 4, the offset number setting device of the present invention includes a CPU 100, a RAM 110, a ROM 120, a key input unit 130, an I / O unit 140, and a machine tool 150. , A display device 160, a position control device 170, a servo control unit 171, and a servo motor 172. In addition, the machine operation unit 154 of the machine tool 150 is provided with a mode selection switch 151, numbering switch 152 and the warning lamp 153.

The central processing unit (CPU) 100 controls the entire CNC apparatus in accordance with the system program stored in the ROM (120). In particular, the central processing unit 100 executes and controls the first mode or the second mode, which will be described later, in order to set the offset number based on the input of the machine tool control panel.

The first mode indicates an automatic setting mode of offset numbers specifying only one offset number which is the same for one tool number. The second mode represents a manual setting mode of offset numbers that can designate a plurality of offset numbers that are the same or different for one tool number.

The RAM 110 is for storing data and processing results necessary for control and arithmetic processing. In particular, the RAM 110 stores data such as a tool length Ht, a height Hm of a workpiece, a distance Hbs between a bed and a spindle, and the like to calculate an offset amount of the origin. The ROM 120 stores a program for controlling the entire system.

The I / O unit 140 is a part that interfaces the central processing unit 100 and the machine tool 150.

The position control device 170 receives the movement command of the control shaft from the CPU 100 to drive the servo motor 172 through the servo control unit 171.

In addition, the key input unit 130 is a device for inputting data, such as a keyboard, and the display device 160 displays the offset number setting screen of FIG. 5 as a CRT or a liquid crystal display.

The mode selection switch (A / M) 151 attached to the operation panel 154 of the machine tool 150 is a manual mode selection switch. When the central processing unit 100 of the CNC is executing the first mode, the switch is selected. Pressing switches the first mode, which is the automatic setting mode, to the second mode, which is the manual setting mode. In contrast, when the CNC central processing unit executes the second mode, pressing this switch performs the function as the automatic mode selection switch, and the second mode is switched to the first mode.

When the numbering switch 152 of the operation panel 154 is touched while the second mode is selected, the cursor on the offset setting screen of the display device 160 is moved to the desired offset number.

The warning lamp 153 is an alarm lamp for notifying the outside of this error when the command offset number and the current offset number do not match.

Hereinafter, the offset number setting method of the present invention will be described with reference to FIGS. 5 and 6.

For example, it is assumed that eight tools can be mounted on a turret of a CNC lathe to which the present invention is applied, and that the number of tools required for a specific machining operation is sixteen.

In this case, it is necessary to measure the length of the tool first to find the origin offset value before starting the machining operation.

Thus, the operator completes the preparation for mounting the tool on the turret and measuring the length of the tool in the order of work.

Step ST11: When preparation for measuring the length of the tool is completed, the CRT screen 160 is automatically moved to the offset setting screen as shown in FIG.

Step ST12: The tool which needs to set the offset is waiting for the tool length measurement, and the tool number is assigned.

Step ST13: At this time, the central processing unit 100 of the CNC determines whether the manual mode selection switch 151 (the mode selection switch of FIG. 4) of the operation panel 154 has been touched. Normally, the first 8 tools (TOOL NO. 1 to 8) do not touch the manual mode selection switch 151, and according to the automatic setting mode (first mode), the same offset number as the tool number (offset NO. 1 to 8) Specifies. Next, in order to set the offset number for the second 8 tools (TOOL NO. 1 to 8), the new offset number (offset NO. 11 to 18) must be manually specified because the same offset number as the tool number is already assigned. do. Therefore, the operator touches the manual mode selection switch 151 of the operation panel to switch the automatic setting mode (first mode) to the manual setting mode (second mode).

Since the manual setting mode does not exist in the related art, the offset number setting process is terminated in the first eight tools, and after the work of the first eight tools is completed, the eight tools for the next work are replaced with the turret. Had to be mounted and reset the same offset number as the corresponding tool number.

Step ST14: If the manual mode selection switch 151 is not operated in step ST13, the central processing unit 100 assigns the same offset number as the tool number according to the automatic setting mode, and the cursor on the CRT screen is assigned to the specified offset number. Will move. An example in which the offset number is set according to the automatic setting mode is shown in TOOL NO 1 to 8 and offset NO 1 to 8 of FIG. 5.

Step ST15: When the manual mode selection switch 151 is operated in step ST13, the central processing unit 100 cancels the automatic setting mode and switches to the manual setting mode. The operator selects the desired offset number using the numbering switch 152 of the operation panel.

Step ST16: When the offset number is selected by the numbering switch 152, the central processing unit 100 commands the movement to the selected offset number.

Step ST17: The central processing unit 100 determines whether the commanded offset number and the current offset number on the CRT screen are the same, and if it is not the same, proceeds to step ST18 to turn on the warning lamp 153 of the operation panel or to turn on the CRT screen. An alarm is issued to output an error. If the error is the same, step S19 is reached.

Step ST19: If the offset number commanded in step ST17 and the current offset number on the CRT screen are the same, the cursor on the CRT screen is moved to the designated offset number to set the same offset number as the command number. An example in which the offset number is set according to the manual setting mode is shown in TOOL NO 1 to 8 and offset NO 11 to 18 of FIG. 5.

Step ST20: When the setting of the offset number corresponding to the tool number is finally completed in the steps ST14 and ST19, the operator measures the length of the tool and inputs an offset amount for the corresponding offset number.

In the above-described embodiment, a machining operation for mounting 16 tools on an 8-axis turret has been described as an example, but the present invention is not limited thereto. If more than 16 tools are mounted, the offset number setting process by the manual setting mode will be repeated several times. In addition, offset numbers corresponding to one tool number will not coincide with each other.

The present invention is not limited to the above-described embodiments, and various modifications and variations are made by those skilled in the art within the equivalent scope of the technical concept of the present invention and the claims to be described below. Of course it is possible.

The present invention can set several offset numbers for one tool number, so that the process of setting an offset number can be completed at a time. Therefore, the tool length correction process of the CNC machine tool can be completed more simply and in a short time.

Claims (3)

A numerical control machine tool that designates a corresponding offset number for each of a plurality of tool numbers so as to correspond 1: 1 to a plurality of tools used for a specific machining operation and a plurality of offset amounts due to the tool length of each of the tools. Offset number setting device, The offset number setting device A first mode in which only one offset number is designated for one tool number, and a second mode in which a plurality of same or different offset numbers can be specified for one tool number, A mode selection switch for selecting only one of the first and second modes; A numbering switch for directly designating an offset number corresponding to a specific tool number when the second mode is selected; A control unit for performing the first mode and the second mode and, in particular, setting an offset number input by the numbering switch to a corresponding tool number when the second mode is selected; And a display device for displaying a tool number and an offset number designated by said control unit. A numerical control machine tool that designates a corresponding offset number for each of a plurality of tool numbers so as to correspond 1: 1 to a plurality of tools used for a specific machining operation and a plurality of offset amounts due to the tool length of each of the tools. In An offset number automatic setting step of automatically designating the same offset number so as to correspond 1: 1 to each of the plurality of tool numbers; An offset number manual setting step for manually designating an offset number different from this tool number for each of the plurality of tool numbers; And the manual setting step is executed at least once according to a selection after the automatic setting step is performed. The method of claim 2 When the manual setting step is executed more than once, the offset number assigned to the same tool number is different from each other, characterized in that the offset number setting method of the numerical control machine tool.