JPS61173842A - Numerical control device - Google Patents

Abstract

PURPOSE:To make it possible to eliminate the correction of a machining program in each programing work, by reading out a correspoinding table from a memory when a cutting term to be corrected is found after the result of searching exsecution data. CONSTITUTION:When a worker determines that a feed sped and a peripheral speed are not inappropriate upon machining of a workpiece on the basis of execution control data MDT, the rotational speed of a corresponding drive motor 19 is controlled for correction by operating an override indicting means 20. When the worker determines that the correction of the cutting term is inevitable for a machining program PRO on execution, a machining program correcting instruction AMC is issued by operating an input device 5 to allow a main control section 2 to instruct an execution control data compiling and controlling section 10 so that the MDT is rewritten for correction. Therefore, the control section 10 rewrites the instruction corresponding to the MDT stored in an execution control data memory 11 in accordance with the cutting term from the indicating means 20. Accordingly, no correction of execution control data is required upon formulation of a new machining program.

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. The present invention relates to a numerical control device having a so-called automatic program function, which automatically determines within the machine.

(b), the applicant of the prior art filed Japanese Patent Application Laid-Open No. 58-132439 (Japanese Patent Application No. 57-1982).
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 the operator modifies a certain machining program using the override instruction means, the operator no longer has to operate the override instruction means every time the corresponding nib 4-gram is executed.

(C) 0 Problems to be Solved by the Invention On the other hand, recent automatic programs refer to cutting condition files stored in memory according to machining data such as material 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 the machining data input to the machine.

These methods allow the creation of machining programs without giving the operator any decision-making authority regarding machining conditions.
While this has the advantage of not requiring skilled workers, it has the disadvantage that it is impossible to create a machining program with cutting conditions suitable for each machining site.

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 will not change. However, each time a different machining program is created, cutting conditions that are not suitable for 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. Ta.

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 unnecessary numerical control equipment.

(d) Means for solving the zero problem, that is, the present invention provides a command means for instructing rewriting of the cutting conditions shown in the cutting condition table, and receives a cutting condition table rewriting instruction from the command means.

According to the order, an execution control data editing control section is provided which searches the execution control data in the second memory to check whether the cutting conditions have been modified, and further includes an execution control data editing control section that searches the execution control data in the second memory and searches for the cutting conditions as a result of the search by the control section. If there is a modification, the corresponding cutting conditions table is read from the first memory,
A rewriting data control unit is provided for rewriting a value indicating a machining condition corresponding to the modification in the cutting condition table to a modified value in the execution control data.

(e) 0 effect With the above-described 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 checked by the cutting condition table rewrite command when creating execution control data. Since it is rewritten, when creating a machining program from now on, the correct cutting conditions are set using the corrected cutting conditions table.

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

FIG. 1 is a control block diagram showing an embodiment of a numerical control device according to the present invention, FIG. 2 is a flowchart showing an example of a file modification program, and FIG.

Figure 4 is a schematic diagram showing an example of a created machining program in the machining program memory, Figure 4 is a schematic diagram showing a cutting condition table in the cutting condition file, and Figure 5 is an example of how cutting conditions are displayed on the display section. Figures 6 and 7 are schematic diagrams showing the contents of the execution control data memory, Figure 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 Figure 9 is the diagram after the correction. FIG. 3 is a schematic diagram showing a cutting condition table.

As shown in FIG. 1, the numerical control device 1 has a main control section 2, and the main control section 2 includes a display section 3 such as a display,
Input device 5 such as a keyboard, cutting condition determination calculation unit 6, cutting condition file 7, rewriting data control unit 9, execution control data editing control unit 10, execution control data memory 11, system program memory 12, machining program calculation unit 1
3, a machining program memory 15, a machining program creation control section 16, etc. are connected. Execution control data memory 11
An axis control section 17 is connected to the axis control section 17, and a drive motor 19 and an override instruction means 20 for driving each control axis of the machine tool 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 obtain various machining data DAT necessary for machining the workpiece based on the final machining shape of the workpiece.
Input A (data such as workpiece material, processing method, cutting point, processing shape, etc.). Processing data DA thus input
Based on the TA, by means of a known automatic program,
A machining program PRO regarding the workpiece is created by the machining program creation control section 16 and 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 section 2 reads the machining program PRO for the workpiece from the machining program memory 15 and outputs it 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 FIG.
), machining method (in this case, outer diameter machining by rough finishing of a round bar), cutting points, etc. indicates the machined shape) along with its dimensions (start point and end point coordinates).

The cutting condition determination calculation section 6 uses the input machining program P.
From the RO, the specific cutting conditions necessary for machining, ie, circumferential speed, feed, etc., are determined. 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 in which the cutting conditions for the machining method are shown for each workpiece material, and the material of the workpiece to be machined is If it is known from the program PRO, the cutting condition determination calculation unit 6 can immediately read the cutting condition table TBL indicating the cutting conditions necessary for the processing from the cutting condition file 7.

The cutting condition determination calculation section 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 address shown by the angle line 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 sequentially 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 indicate each machining method. ), the cutting conditions are determined one after another by referring to the cutting condition table TBL in the cutting condition file 7, and are notified to the machining program calculating section 13.

In this way, when all the cutting conditions for the machining program PRO read out from the machining program memory 15 have been determined, the machining program calculating section 13 converts the machining program PRO into the machining program PRO 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 by driving and controlling 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 the modification of the cutting conditions is essential for the machining program PRO currently being executed, 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.
Override instruction means 2 in which the operator instructs to modify the corresponding command of the execution control data MDT stored therein.
The cutting conditions are rewritten to the ones specified by 0, and a data change mark M is added to the rewritten data as shown in Fig. 7.
Enter K (in the case shown in Figures 6 and 7, enter the F command, which is the feed rate command, in the execution control data MDT)
Changed from 04 to Fo, 6. Note that the data change mark MK is displayed in a frame surrounding the commands Fo and 6 in FIG. ). 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. This notifies the operator that the execution control data MDT corresponding to the machining program PRO currently being executed has been rewritten.

At this time, if the operator also wishes to rewrite the corresponding cutting conditions of the cutting condition table TBL stored in the cutting condition file 7, the operator operates the input device 5 to issue the cutting condition table rewriting command ACT. Output to the control section 2. In response to this, the main control unit 2° reads the file modification program FAP from the system program memory 12, and based on the file modification program FAP, the execution control data editing control unit 10 and the rewriting data control unit 9 instruct the corresponding cutting conditions. Commands an operation to rewrite the cutting conditions of table TBL.

That is, as shown in FIG. 2, in step S1, the file modification program FAP causes the execution control data editing control unit 10 to search the execution control data MDT in the execution control data memory 11, and determines the spindle speed, feed rate, etc. It is to be determined whether or not a data change mark MK is attached to the data regarding the cutting conditions, and if the data regarding the cutting conditions is not attached to the data change mark MK, the operator is notified as an error via the display unit 3. The error display step is not shown in the flowchart of FIG. ), if there is a data change mark MK, the process goes to step S2. In step S2, the rewrite data control unit 9 is caused to read the cutting condition table TBL corresponding to the workpiece material from the cutting condition file 7, and further in step S3, the cutting condition corresponding to the machining method for which modification has been instructed is called. The execution control data MDT is the machining program PRO.
The machining methods in the machining program PRO that should be corrected immediately at the position of the data change mark MK on the execution control data MDT are created in a form corresponding to each of the machining methods numbered in Figure 3. becomes clear.

After 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 determination in step S4 can be easily made.

If the change is related to the spindle speed, the process proceeds to step S5, where the circumferential speed is calculated from the corrected spindle speed indicated in the spindle speed command indicated in the execution control data MDT, and the process proceeds to step S5.
In step S6, the control unit 9 rewrites the numerical value of the corresponding cutting condition in the cutting condition table TBL to the corrected circumferential speed obtained in step S5, and attaches a data change mark MK to the rewritten numerical value. Further, 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 related to the feed rate. Then, the process goes to step S7, where the controller 9 rewrites the feed rate value of the corresponding machining method in the cutting condition table TBL as shown in FIG. attached to the numerical value. Note that the rewriting in step S6 is not shown, but
This is similar to that shown in FIG.

In this way, when the cutting conditions related to the predetermined machining method in the predetermined cutting condition table TBL in the cutting condition file 7 are rewritten by the file modification program FAP into a form that matches the actual situation, the next time a new machining program PRO is started for a different workpiece. When creating the cutting condition determination calculation unit 6 reads the cutting condition table position from the cutting condition file 7 and calculates the cutting conditions, a corrected appropriate value is immediately read out. There is no need for the operator to operate the override instruction means 20 to modify the execution control data MDT when performing processing based on the above-described processing.

On the other hand, the machining program PRO created by the operator
is completed through the modification of the cutting conditions via the override instruction means 20, and is stored in the machining program memory 15 together with the corresponding execution control data MDT in preparation for actual machining (in normal cases, the first When modifying the machining program PRO1, that is, the execution control data MDT, the first workpiece will be machined.) During actual machining, the identification number assigned to the machining program PRO is input from the input device 5, the corresponding execution control data MDT is read from the machining program memory 15, transferred to the execution control data memory 11, and the axis control unit 17 However, at the time of point B, the execution control data MDT corresponding to the machining program PRO has already been corrected to the value originally corrected by the override instruction means 20, so the operator re-instructs the override instruction means 20. The cutting conditions can be set to an appropriate state without having to modify the cutting conditions through operation.

(g) 0 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 table TBL is provided, and the command means from the command means is provided. By the cutting condition table rewriting command ACT, the execution control data MD in the second memory such as the execution control data memory 11 is
An execution control data*S control unit 10 is provided which searches for T to determine whether or not the cutting conditions have been modified. , reads the corresponding cutting condition table TBL from the first memory such as the cutting condition file 7, and reads the value indicating the machining condition corresponding to the correction in the cutting condition table TBL to the corrected value in the execution control data MDT. Since the rewriting data control unit 9 is provided to rewrite the value to the value, it is possible to rewrite the value of the cutting condition table TBL that is referred to at the stage of creating the execution control data MDT from the machining program PRO created by the operator. Since the corrected cutting conditions will be selected for all machining programs PRO created after that, each time a new machining program PRO is created, inappropriate cutting conditions will be detected in the cutting condition table TBL. set,
It is possible to eliminate the complicated work of having the operator modify the information by operating the override instruction means.

[Brief explanation of the drawing]

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 a cutting condition table in a cutting condition file, and FIG. 5 is a diagram showing an example of display of cutting conditions on a display section.
Figures 6 and 7 are schematic diagrams showing the contents of the execution control data memory, Figure 8 is a diagram showing an example of how the cutting conditions are displayed on the display after the cutting conditions have been corrected, and Figure 9 is the cutting conditions after the correction. It is a schematic diagram showing a table. 1... Numerical control device 5... Command means (input device) 6... Cutting condition determination calculation unit 7... First memory (cutting condition file) )9・
... Rewrite data control section 10 ... Execution control data aS control section 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 DA
TA・・・Processed data applicant Yamazaki Iron Works Co., Ltd. Agent Patent attorney Phase 1) Shinji (and 1 other person)

Claims (1)

[Scope of Claims] A first memory includes a first memory storing a cutting condition table showing cutting conditions corresponding to machining data shown in the machining program, and the first memory A cutting condition determination calculation unit is provided which reads a corresponding cutting condition table from the memory and determines cutting conditions corresponding to the machining data, and performs 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 necessary execution control data, and further has a second memory that stores the execution control data created by the machining program calculation unit, the cutting process shown in the cutting condition table is performed. Execution control data editing, in which a command means for instructing rewriting of conditions is provided, and the execution control data in the second memory is searched for whether or not the cutting conditions have been modified in response to a command to rewrite the cutting conditions table from the command means. A control section is provided, and if the cutting conditions are modified as a result of the search by the execution control data editing control section, the corresponding cutting conditions table is read from the first memory, and the information in the cutting conditions table is read out from the first memory. A numerical control device comprising a rewriting data control unit that rewrites a value indicating a machining condition corresponding to the modification to a modified value in the execution control data.