JP2005135104A - Display method of tool offset value of nc machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate operations of registering and editing offset values by increasing browsability in a method for displaying on a display tool offset values indicating a positional relation of a tool mounted on a machine tool to a workpiece in the origin of movement. <P>SOLUTION: Tool codes described in a machining program and subprograms called by the machining program all registered in an NC system are retrieved, and a temporary table is created. With keys that are offset numbers of the tool codes extracted in the temporary table, the tool codes in the temporary table and offset values registered in association with the offset numbers are displayed in an editable list. Along with the tool codes, comments described in the programs are also displayed. Limiting the display to the tool codes of tools requiring a frequent offset value change can make an operation of correcting offset values easier. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method of displaying a tool offset value registered in an NC device on a display of an NC device or a computer connected thereto in order to indicate a positional relationship with a workpiece at a movement origin of a tool mounted on a machine tool. It is.

  An NC device of a machine tool that processes a workpiece using a plurality of mounted tools is provided with a table for registering an offset value indicating the positional relationship between the cutting edge of the mounted tool and the workpiece. The record number in this table is called the offset number, and the tool used for machining is specified by a tool code (T code) that combines the number indicating the tool mounting position (tool number) and the offset number. It has become.

  For example, a tool code generally used in a lathe is displayed as TXX, where X is a tool number indicating a tool mounting position, and XX is an offset number, both of which are two-digit numbers. When this tool code is specified in the machining program, the NC unit will cause the machine tool to select the tool installed at the XX tool mounting position, and the machining position described in the machining program will be the record number in the offset table. Command to move the tool post to the position corrected (displaced) with the offset value registered in XX.

  In general, the offset value is unique to each tool. However, when the tool is mounted via a holder, or when the left workpiece is machined with a two-spindle facing lathe, the offset value is different when machining the right workpiece. Come different. Also, in finishing tools such as turning tools, even if the tool is moved to the same position and processed, the finishing dimensions differ depending on the degree of wear of the cutting edge. Accordingly, it is necessary to change the offset value.

  The offset value is registered or changed in the offset table by displaying the offset table in a table format as shown in FIG. 4 on the display of the NC device or the display of a personal computer connected to the NC device. In the table, the records of the offset table are displayed in the order of the record numbers. However, since all the records cannot be displayed on one screen, the screen has a plurality of pages. The machine tool operator refers to the tool code described in the machining program and the tool data corresponding to the tool number, and needs the record corresponding to the offset number of the tool code used in the machining program. A valid offset value. In addition, for tools with a high management level such as finishing tools that cause errors in workpiece machining accuracy due to wear of the cutting edge, an offset table is displayed as necessary so that the cutting edge wear is offset. Change the offset value referenced by the tool code offset number.

The offset table shown in FIG. 4 is for an NC lathe, Z is the offset value in the spindle direction, X is the offset value in the cutting feed direction of the tool post perpendicular to the spindle, and Y is the direction orthogonal to X and Z , R is a value (dimension) indicating the cutting edge radius, and TIP is a number indicating the direction of the cutting edge.
JP 2002-154034 A JP 2003-275842 A

  However, since the tool number is not displayed in the conventional display of the offset table, the operator refers to the tool code described in the machining program and confirms the relationship between the tool number and the offset number while registering the offset value. There was a problem that editing had to be performed, and editing and confirmation were troublesome. In addition, because the table is displayed in the list in the order of records, offset number data not used in the machining program is also displayed and lacks in listability. By scrolling the screen or switching pages, the offset number data to be edited is displayed. There was a problem that we had to look for.

  In particular, when changing the offset value due to wear, the offset number column indicating the offset value that needs to be changed is used in combination with the tool number assigned to the finishing tool and the tool number. There is a problem that the workability is very poor because it is necessary to switch the screen over a plurality of pages while checking the offset number.

  In the present invention, the tool code described in the machining program registered in the NC device and the subprogram called from the machining program is searched to create a temporary table, and the offset of the tool code listed in this temporary table The above problem is solved by taking a relation with the offset table using the number as a key, and displaying a list of tool codes in the temporary table and the offset values registered corresponding to those offset numbers in an editable state. ing.

  At this time, the tool type corresponding to the tool number of each tool code can also be displayed by simultaneously extracting and displaying a comment on the tool code described in the machining program or subprogram together with the tool code.

  That is, the NC machine tool tool offset value display method according to the first aspect of the present invention includes a machining program registered in the NC apparatus, a tool code retrieved from a subprogram called by the program, its comment, and retrieval. The offset value extracted from the offset table is displayed as a list in an editable state using the offset number of the tool code as a key.

  In the method of claim 1, the tool codes of all the tools used for machining a certain workpiece are displayed in a list. When the machining error of the workpiece due to wear of the tool edge is corrected by changing the offset value, the correction is performed. If only the tool code of the tool that needs to be displayed is displayed, the offset value can be corrected more easily. The inventions of claim 2 and claim 3 take this into consideration, and the invention of claim 2 only applies a tool code having a high management level, such as a finishing tool that frequently requires correction of an offset value. The invention of claim 3 makes it easier to correct the offset value for tool wear by displaying the tool code and its offset value in a list in descending order of management level. It ’s what you get.

  That is, the invention of claim 2 of the present application is the tool offset value display method according to claim 1 described above, in which the tool code comment described in the machining program and the subprogram called from the machining program is a tool with a high management level. A symbol indicating that the symbol is present is added, and only the tool code including the symbol in the comment is displayed.

  The invention of claim 3 of the present application provides the tool offset value display method according to claim 1, wherein an item for inputting a management level is provided in each record of the offset table, and the searched tool code is set to the value of the item. It sorts and displays it as a key.

  According to the method of the present invention described above, only the tool code used when machining a certain workpiece is extracted, only the offset value corresponding to the offset number is displayed, and unnecessary data is not displayed. Visibility is improved, and it becomes possible to easily register and change necessary offset values. In addition, since the tool code consisting of the tool number and offset number and its comment are displayed, the mounting position and type of the tool can be determined, and the offset value can be confirmed and edited smoothly and without error. It becomes like this.

  Furthermore, according to the second and third aspects of the present invention, since a tool having a high management level such as a finishing tool that frequently needs to be changed is displayed together, an offset value for correcting wear of the tool edge. The change work becomes easier.

  Hereinafter, an embodiment of the present invention will be described using a two-spindle opposed lathe as an example. FIG. 3 is an explanatory diagram showing the relationship between the tool mounted on the tool post of the two-spindle opposed lathe and its tool code. 1L is the left spindle chuck, 1R is the right spindle chuck, 2L and 2R are the respective A workpiece held by the chuck, 3 is an upper tool rest with an automatic tool changer, 4 is a lower tool rest with a turret 5, and 6 is a tool mounted at the number 01 tool mounting position of the automatic tool changer. , 7 is a turning tool mounted on the turret 5 at the tool mounting position No. 02. T0101 and T0141 are the tool codes assigned to the tool 6. The first two digits of 01 indicate that the tool is mounted at the No. 01 tool mounting position, and the lower two digits of 01 are left on the tool 6. An offset number 41 when machining the workpiece 2L gripped by the chuck is an offset number when machining the workpiece 2R gripped by the right chuck with the tool 6. T0202 and T0226 are tool codes assigned to the tool 7. The upper two digits 02 indicate that the tool is mounted at the No. 02 tool mounting position, and the lower two digits 02 indicate the tool 7 The offset number when machining the workpiece 2L gripped by the left chuck with the left cutting edge 7L, and 26 is the offset number when machining the workpiece 2R gripped by the right chuck with the right cutting blade 7R.

  The NC device is provided with an offset table having these offset numbers 01, 41, 02, and 26 as record numbers, and the above-described Z, X, Y, R, and TIP are added to the record of the corresponding number in the offset table. Offset values such as are registered.

  FIG. 1 is a diagram illustrating a display screen according to the display method of the present invention when the tool code illustrated in FIG. 3 is used in a machining program or a subprogram called from the machining program. For the T code (tool code) retrieved from the subprogram called from the machining program, the T code, comments, and offset values such as X, Z, Y, R, and TIP are listed in a table format. The displayed offset value is a value registered in the offset table in advance. By using the last two digits of the displayed T code and the record number of the offset table as a key, the offset table is used as a relation. Is the value extracted from

  The T code displayed is only the T code extracted by the search operation from the machining program and the subprogram to be called from now. The comment is also extracted and displayed in the comment column when searching for the T code. Therefore, T codes not described in the program are not displayed.

  FIG. 2 is a flowchart showing an example of a procedure for extracting the T code from the machining program. First, the selected machining program and its subprograms are read in block units from the top, and it is checked whether each block has a description of tool commands (commands for T codes used for machining). Then, it is checked whether the T code declared in the tool command has already been written in the temporary table. If it is a new T code that has not been written, the T code and its comment are written in the temporary table. By repeating this procedure, a list of tool codes used in the machining program to be processed and its subprograms is created in the temporary table, and when all the program blocks have been read, the search procedure is terminated.

  Then, the last two digits (offset number) of the T code of each record of the temporary table created in the above procedure is cut out, and the relation between the temporary table and the offset table is set using this number and the record number of the offset table as a key. Since the offset value corresponding to the T code extracted in the temporary table can be extracted, the display screen of FIG. 1 can be obtained by displaying the temporary table together with the extracted offset value in a list format.

  The operator can view the tool used for machining a workpiece, the offset number assigned to the tool, and the offset value in a list format by looking at the screen of FIG. Or an offset value is newly registered for an item for which no offset value is registered.

  In the T code extraction procedure shown in Fig. 2, a machining program is described by including a predetermined symbol such as * or @ in a T code for finishing machining or a comment of a tool command that frequently requires wear correction. If only the tool that contains the above symbol in the comment is written in the temporary table in the T code detected from the program block, * and @ are included in the comment. Only the T code is extracted. Therefore, only such tool codes can be listed and displayed in a temporary table.

  Also, as shown in FIG. 1, a column for setting the management level L is provided in the offset table, and the management level is registered as a numerical value in the descending order of frequency in which the offset value needs to be changed due to wear or the like. If the temporary table is sorted and displayed on the screen based on the numerical values, T codes that frequently require correction of offset values due to, for example, tool wear, etc. are displayed at the beginning of the table in order from the highest management level. As a result, the offset value can be managed and corrected more easily.

  The display of the tool offset value according to the method of the present invention can be displayed not only on the display of the NC device but also on the display of a management personal computer connected to the NC device via a network. Can edit the offset value registered in the NC device, or call the machining program and offset table of the target NC device from a personal computer managing a plurality of NC devices, and the temporary table Can be created on a personal computer and displayed on the display of the personal computer, and the offset table of the target NC device can be edited on the personal computer.

Explanatory drawing which shows an example of the display screen of the tool offset value of this invention Flow chart showing an example of a procedure for extracting a tool code to be displayed from a machining program An explanatory diagram showing the relationship between a tool and a tool code, using a two-spindle facing lathe as an example Explanatory drawing which shows an example of the display method of the conventional offset value

Explanation of symbols

2L Left work 2R Right work 3 Upper tool post 4 Lower tool post 6 Tool 6a Tool No. 01 6b Tool No. 02 7 Cutting edge

Claims (3)

  Tool codes and comments retrieved from machining programs registered in the NC unit and subprograms called by the program, and offset values extracted from the offset table can be edited using the offset number of the retrieved tool code as a key. A tool offset value display method for NC machine tools that displays a list in a state.   A symbol indicating that the tool has a high management level is added to the comment of the tool code described in the machining program and a subprogram called from the machining program, and only the tool code including the symbol is displayed in the comment. The tool offset value display method according to Item 1.   The tool offset value display method according to claim 1, wherein an item for inputting a management level is provided in each record of the offset table, and the searched tool codes are sorted and displayed using the value of the item as a key.

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