JPH05168B2 - - Google Patents

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention has a cutting condition file, and when creating a machining program, the cutting conditions in actual machining are determined according to the cutting conditions indicated in the cutting condition file. This invention relates to a numerical control device having a so-called automatic program function that automatically determines the value within the machine.

(b) Prior art
No. 15275), a machining program correction control method that rewrites the speed instruction value in the machining program to the optimal value instructed by the override instruction means when the feed speed or circumferential speed is changed by the override instruction means. is proposed.
With this method, once a worker modifies a certain machining program using the override instruction means, the worker no longer has to operate the override instruction means every time the machining program is executed.

(c) Problems to be solved by the invention On the other hand, recent automatic programs refer to a cutting condition file stored in memory according to machining data such as homogeneity input by the operator, and A method is used in which the circumferential speed, feed rate, etc. during machining are automatically determined from the circumferential speed, feed rate, etc. indicated in accordance with input machining data. These methods can create machining programs without giving the operator any decision-making authority regarding machining conditions, so they have the advantage of not requiring skilled workers. There is a drawback that it is impossible to create.

Therefore, a method has been proposed in which the corresponding machining program is rewritten and modified by issuing a modification instruction using the override instruction means described above, but even with this method, the cutting conditions in the cutting condition file that are automatically determined when creating the machining program do not change. However, each time a different machining program is created, cutting conditions that do not suit the machining site are selected, and the operator must always modify the cutting conditions in the machining program when executing the machining program for the first time. .

In order to solve the above-mentioned drawbacks, the present invention sets inappropriate cutting conditions in a cutting condition table every time a new machining program is created, and the operator corrects them by operating an override instruction means or the like. The purpose is to provide a numerical control device that is not necessary.

(d) Means for solving the problem That is, the present invention provides a command means for commanding rewriting of the cutting conditions shown in the cutting condition table,
An execution control data editing control section is provided for searching the execution control data in the second memory to determine whether or not the cutting conditions have been modified in response to a command to rewrite the cutting condition table from the command means, and further controlling the execution control data editing control section. As a result of the search by section, if there is a modification of the cutting conditions, the corresponding cutting conditions table is read out from the first memory, and the value indicating the machining conditions corresponding to the modification in the cutting conditions table is read out from the first memory. It is configured by providing a rewrite data control unit that rewrites the execution control data to the corrected value.

(e) Effect With the above configuration, the present invention allows the cutting conditions shown in the cutting condition table, which is the basis for determining the cutting conditions, to be rewritten by the cutting condition table rewriting command when creating the execution control data. When creating subsequent machining programs, the corrected cutting condition table acts to set appropriate cutting conditions.

(f) Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

Fig. 1 is a control block diagram showing an embodiment of the numerical control device according to the present invention, Fig. 2 is a flowchart showing an example of a file modification program, and Fig. 3 is an example of a machining program created in the machining program memory. 4 is a schematic diagram showing the cutting conditions table in the cutting conditions file, FIG. 5 is a diagram showing an example of cutting conditions displayed on the display section, and FIGS. 6 and 7 are the execution control data memory. FIG. 8 is a diagram showing an example of how cutting conditions are displayed on the display unit for cutting condition correction control, and FIG. 9 is a schematic diagram showing a cutting condition table after correction.

As shown in FIG. 1, the numerical control device 1 has a main control section 2, which includes a display section 3 such as a display, an input device 5 such as a keyboard, a cutting condition determination calculation section 6, Cutting condition file 7, rewriting data control section 9, execution control data editing control section 1
0, an execution control data memory 11, a system program memory 12, a machining program calculation unit 13, a machining program memory 15, a machining program creation control unit 16, and the like are connected. An axis control section 17 is connected to the execution control data memory 11, and a drive motor 19 for driving each control axis of the machine tool and an override instruction means 20 are connected to the axis control section 17.

Since the numerical control device 1 has the above-described configuration, when using the numerical control device 1 to cause a machine tool to process a predetermined workpiece, the operator refers to the manufacturing drawing and performs the process shown there. The input device 5 is operated to input various machining data DATA (data such as workpiece material, machining method, cutting point, machining shape, etc.) necessary for machining the workpiece based on the final machining shape of the workpiece. Processing data input in this way
Based on the DATA, a machining program PRO for the workpiece is created by the machining program creation control unit 16 using a known automatic programming method, and is stored in the machining program memory 15. When the machining program PRO for the workpiece to be machined is created in this way, the main control unit 2 executes the machining program PRO for the workpiece.
Read PRO from the machining program memory 15,
It is output to the cutting condition determination calculation section 6.

The read machining program PRO is based on the machining data DATA input by the operator, for example, as shown in Figure 3, the material of the workpiece to be machined (S45C in this case), the machining method (in this case, round The rough finishing of the bar), cutting points, etc. are shown, and in more detail, the machining shape of each machined part (in the figure, "straight line", "circular arc", etc. indicate the machining shape). ) are shown along with their dimensions (start point, end point coordinates).

The cutting condition determination calculation unit 6 determines specific cutting conditions necessary for machining, ie, circumferential speed, feed, etc., from the input machining program PRO. To explain in more detail, the cutting condition determination calculation unit 6 searches the cutting condition table TBL in the cutting condition file 7 from the workpiece material displayed in the machining program PRO, and selects a cutting condition table TBL that indicates the cutting conditions for the material to be machined. The condition table TBL is taken out, and cutting conditions are determined based on the taken out cutting condition table TBL. As shown in Fig. 4, the cutting condition file 7 stores a cutting condition table TBL showing cutting conditions for each machining method for each workpiece material, and the material of the workpiece to be machined is determined by the machining method. If it is known from the program PRO, the cutting condition determination calculation section 6 can immediately read out the cutting condition table TBL showing the cutting conditions necessary for the processing from the cutting condition file 7.

The cutting condition determination calculation unit 6 searches for data on the read cutting condition table TBL based on the machining method indicated in the machining program PRO, and searches the data at the underlined address in FIG. 4 in the cutting condition table TBL. The circumferential speed, feed rate, and depth of cut stored in the position are determined to be the cutting conditions to be determined, and are notified to the machining program calculation section 13 and displayed on the display section 3 as shown in FIG. For each machining method shown in the machining program PRO (the machining program PRO, as shown in FIG. The machining operations are numbered from the top of the diagram in the order in which they should be performed, such as "End face (rough)", and the detailed machining shapes are shown in rows that follow the rows indicating each machining method. ), the cutting conditions are determined one after another by referring to the cutting conditions table TBL in the cutting conditions file 7.
The machining program calculation unit 13 is notified.

In this way, when all the cutting conditions for the machining program PRO read from the machining program memory 15 have been determined, the machining program calculating section 13 converts the machining program PRO into the machining program according to the EIA/ISO code etc. shown in FIG. The execution control data MDT is converted using a known conversion method and stored in the execution control data memory 11.

The execution control data MDT stored in the execution control data memory 11 is executed by the axis control unit 17 to drive and control each drive motor 19 based on the execution control data MDT, and a predetermined machining is performed on the workpiece. .

However, when machining a workpiece based on the execution control data MDT, if the operator determines that the feed rate and circumferential speed are not appropriate for machining the workpiece, the operator operates the override instruction means 20 to The rotational speed of the corresponding drive motor 19 is corrected and controlled via the motor to make it suitable for machining the workpiece. If the operator determines that modification of the cutting conditions is essential in the currently running machining program PRO, the operator operates the input device 5 to modify the machining program after modifying the cutting conditions using the override instruction means 20. Upon outputting the modification command AMC, the main control section 2 instructs the execution control data editing control section 10 to rewrite and modify the execution control data MDT. The corresponding command of the execution control data MDT stored in the MDT is rewritten into the cutting conditions instructed by the override instruction means 20 to which the operator has given the correction instruction, and further, as shown in FIG. Enter the data change mark MK (in the case shown in Figures 6 and 7, the F command, which is the feed rate command, in the execution control data MDT is changed from F0.4 to F0.6. Data change mark MK is
In Figure 7, the F0.6 command is shown in a frame. ). When the execution control data MDT is rewritten as shown in Fig. 7, the corresponding cutting conditions displayed on the display section 3 are also changed and displayed with a data change mark MK as shown in Fig. 8. The currently running machining program PRO
Notifies that the execution control data MDT corresponding to has been rewritten.

At this time, if the operator also wishes to rewrite the corresponding cutting conditions in the cutting conditions table TBL stored in the cutting conditions file 7,
The input device 5 is operated to output a cutting condition table rewriting command ACT to the main control section 2. Main control section 2
In response to this, reads the file modification program FAP from the system program memory 12,
Based on the file modification program FAP, the execution control data editing control unit 10 and the rewriting data control unit 9 are instructed to rewrite the cutting conditions of the corresponding cutting condition table TBL.

That is, the file modification program FAP is
As shown in the figure, in step S1, the execution control data editing control section 10 searches the execution control data MDT in the execution control data memory 11, and data change marks MK are made for data related to cutting conditions such as spindle speed and feed rate. If the data change mark MK is not attached to the data related to the cutting conditions, the operator is notified as an error via the display unit 3 (in the flowchart in Fig. 2). (The error display step is not shown.) If there is a data change mark MK, the process goes to step S2. In step S2, the cutting condition table corresponding to the workpiece material is stored in the rewriting data control unit 9 from the cutting condition file 7.
The TBL is read out, and in step S3, the cutting conditions corresponding to the machining method for which correction has been instructed are called. Execution control data MDT is the machining program
It is created in a form corresponding to each processing method numbered in Figure 3 in PRO, so at the position of the data change mark MK on the execution control data MDT,
The machining method in the machining program PRO that should be corrected immediately is known.

When the corresponding cutting conditions are called in step S3, the process proceeds to step S4, where it is determined whether the change marked with the data change mark MK is related to the spindle speed. Normally, in the execution control data MDT, the feed rate is commanded by the F command and the spindle speed is commanded by the S command, so the judgment in step S4 can be easily made.
If the change concerns the spindle speed, step S5
The circumferential speed is calculated from the corrected spindle speed indicated in the spindle speed command indicated in the execution control data MDT, and in step S6, the control unit 9 is informed of the corresponding cutting condition values in the cutting condition table TBL. is rewritten to the corrected circumferential speed obtained in step S5, and a data change mark MK is attached to the rewritten value. In addition, if it is determined in step S4 that the change marked with the data change mark MK is not related to the spindle speed, the change marked with the data change mark MK is determined to be related to the feed rate. Judging by this, step S7 is entered and the control unit 9 rewrites the feed rate value of the corresponding machining method in the cutting condition table TBL as shown in Fig. 9, and also marks the data change mark.
Add MK to the rewritten numerical value. Although the rewriting at step S6 is not shown,
This is similar to that shown in FIG.

In this way, the file modification program FAP changes the cutting conditions related to the predetermined machining method in the predetermined cutting condition table TBL in the cutting condition file 7.
Once it has been rewritten to the actual form, the next time a new machining program PRO is created for a different workpiece, the cutting condition determination calculation unit 6 reads the cutting condition table TBL from the cutting condition file 7 and calculates the cutting conditions. When the execution control data
During machining based on MDT, an operator operates the override instruction means 20 to obtain execution control data.
There is no need to modify MDT.

On the other hand, the machining program PRO created by the operator is completed through modification of cutting conditions via the override instruction means 20, and the corresponding execution control data is stored in the machining program memory 15.
It is stored together with MDT in preparation for actual machining (in normal cases, the first machining program PRO,
That is, when the execution control data MDT is modified, the first workpiece will be processed. ). During actual machining, the identification number assigned to the machining program PRO is input from the input device 5, and the corresponding execution control data is
The MDT is read from the machining program memory 15, transferred to the execution control data memory 11, and executed by the axis control unit 17. At this point, the execution control data MDT corresponding to the machining program PRO has already been transferred to the override instruction means 20. Since the cutting conditions have been corrected to the values originally corrected by , the cutting conditions can be set to an appropriate state without the operator having to operate the override instruction means 20 again to correct the cutting conditions.

(g) Effects of the Invention As described above, according to the present invention, a command means such as the input device 5 for commanding rewriting of the cutting conditions shown in the cutting condition cable TBL is provided, and cutting from the command means is provided. Condition cable rewriting command
ACT is provided with an execution control data editing control unit 10 that searches execution control data MDT in a second memory such as the execution control data memory 11 to determine whether cutting conditions have been modified; As a result of the search by section 10, if there is a modification of the cutting conditions, the corresponding cutting conditions table is
Rewrite data control that reads TBL from a first memory such as the cutting condition file 7 and rewrites the value indicating the machining condition corresponding to the modification in the cutting condition table TBL to the modified value in the execution control data MDT. Since part 9 is provided, it is possible to rewrite the values of the cutting condition table TBL that is referenced at the stage of creating the MDT created by the operator.
Therefore, the machining program created after that
Since the correct cutting conditions are selected for all PROs, each time a new machining program PRO is created, inappropriate cutting conditions will be set in the cutting conditions table TBL, and the operator will have to By operating the override instruction means and making corrections, the complicated work can be eliminated.

[Brief explanation of the drawing]

Fig. 1 is a control block diagram showing one embodiment of the numerical control device according to the present invention, Fig. 2 is a flowchart showing an example of a file modification program, and Fig. 3 is an example of a machining program created in the machining program memory. 4 is a schematic diagram showing the cutting conditions table in the cutting conditions file, FIG. 5 is a diagram showing an example of cutting conditions displayed on the display section, and FIGS. 6 and 7 are execution control data. FIG. 8 is a schematic diagram showing the contents of the memory, FIG. 8 is a diagram showing an example of how the cutting conditions are displayed on the display unit after the cutting conditions have been corrected, and FIG. 9 is a schematic diagram showing the cutting condition table after the correction. DESCRIPTION OF SYMBOLS 1... Numerical control device, 5... Command means (input device), 6... Cutting condition determination calculation unit, 7... First memory (cutting condition file), 9... Rewriting data control unit, 10... Execution control data editing control unit, 11... second memory (execution control data memory), 13... machining program calculation unit, PRO...
Machining program, TBL...cutting condition table,
MDT...Execution control data, ACT...Cutting condition table rewriting command, DATA...Machining data.

Claims (1)

[Claims] 1. A first memory that stores a cutting condition table showing cutting conditions corresponding to machining data shown in the machining program, and corresponding from the first memory based on the machining data shown in the machining program. A cutting condition determination calculation unit is provided that reads a cutting condition table and determines cutting conditions corresponding to the machining data, and extracts execution control data necessary for actual machining from the cutting conditions and machining data determined by the cutting condition determination calculation unit. In a numerical control device that is provided with a machining program calculation unit that creates a machining program calculation unit and further has a second memory that stores execution control data created by the machining program calculation unit, a command is given to rewrite the cutting conditions shown in the cutting condition table. and an execution control data editing control unit that searches the execution control data in the second memory to determine whether or not the cutting conditions have been modified in response to a command to rewrite the cutting condition table from the command means; Furthermore, if the cutting conditions are modified as a result of the search by the execution control data editing control section,
A rewrite data control unit is provided that reads a corresponding cutting condition table from a first memory and rewrites a value indicating a machining condition corresponding to the modification in the cutting condition table to a modified value in the execution control data. Numerical control device configured with