JPH0375885B2 - - Google Patents

Description

Detailed Description of the Invention The present invention inputs machining information that defines the machining position and machining shape on a workpiece, and uses the machining information that defines the machining position and machining shape to perform numerical control necessary for numerically controlled machining. This relates to a numerical control device equipped with an automatic programming function that automatically creates programs, and its purpose is to transmit machining information that defines machining positions and machining shapes for each workpiece, and to By defining things,
When these workpieces are mounted on a workpiece support table at the same time and machined, the machining spots that can be machined with the same tool among the multiple machining spots on multiple workpieces are machined consecutively. The purpose of the present invention is to create an efficient numerical control program that requires less frequent tool replacement, and to allow machining information to be input easily even when creating such an efficient numerical control program.

In machining center type machine tools, when the workpiece is small, multiple workpieces are mounted on the workpiece support stand of the machine tool and continuous machining is performed, and the operator places the workpiece on the machine tool to attach and detach the workpiece. This is done to increase the work efficiency of the worker by reducing the frequency of visits to the For machining locations that can be machined with a machining tool, it is preferable to perform machining continuously in the same machining process in order to reduce tool exchange frequency and shorten machining time. This applies not only when multiple workpieces placed on the workpiece support are all of the same type, but also when each workpiece is of a different type, but a part of it can be machined with the same tool. The same can be said for cases where there are parts.

However, even though conventional numerical control devices have an automatic programming function, when performing such machining, there is a problem in that inputting the machining information necessary to create numerical control data is a hassle. .

In other words, in automatic programming in conventional numerical control devices, there is no function to create a numerical control program by integrating machining information input for each workpiece, so continuous machining across multiple workpieces as described above is not possible. In some cases, all machining positions on multiple workpieces placed on the workpiece support are integrated, that is, multiple workpieces on the workpiece support are considered as one workpiece. It is necessary to input data to define the position and machining shape. To do this, it is necessary to calculate the coordinate values of each machining position by considering the mounting position of each workpiece on the workpiece support, and calculating the coordinate values of the machining position requires complicated calculations. In addition, if the mounting position of the workpiece on the workpiece support table changes, all related machining position data must be corrected. There are problems that cannot be easily addressed.

In addition, when machining multiple types of workpieces placed on a workpiece support table, it is necessary to determine for each workpiece which parts can be machined with a common tool. There is a problem that inputting processing information becomes even more troublesome.

The present invention has been made in view of these conventional problems.The present invention is based on machining information defined for each workpiece for each of a plurality of workpieces placed on a workpiece support. Among the machining locations on a workpiece, the machining locations that can be machined with the same tool are determined, and a numerical control program is created to continuously machine the determined machining locations in the same machining process. This is a characteristic feature.

Embodiments of the present invention will be described below based on the drawings. In FIG. 1, numeral 10 is a central processing unit that constitutes the main body of the numerical control device, and includes a microprocessor MPU, a read-only memory ROM, a random access memory RAM1 which is battery backed up and made non-volatile, and a buffer random access memory RAM2. It is structured accordingly. and,
This central processing unit 10 includes a keyboard 11 serving as data input means, a CRT display device 12 serving as display means, servo motor drive circuits DUX, DUY,
A pulse generation circuit 13 and a sequence circuit 15 that supply command pulses to DUZ and DUB are connected via an unillustrated interface.

On the other hand, 20 is a machining center type machine tool controlled by the numerical control device having the above configuration, and the servo motor drive circuits DUX, DUY,
By the rotation of the servo motors 21, 22, and 23 driven by each of the DUZs, the relative position between the workpiece table 25, which supports the workpiece W, and the spindle head 24, which supports the spindle 26, is adjusted. Changed three-dimensionally. Further, 27 is a tool magazine that holds a plurality of types of tools, and the tools in the tool magazine 27 are selectively mounted on the spindle 26 by a magazine indexing device (not shown) and a tool changing device 28 (not shown), and the tools are inserted into the workpiece. W processing is performed.

The workpiece W is mounted on a workpiece table 25 on a workpiece support 30 that is rotatably mounted around an axis perpendicular to the axis of the main shaft 26 and rotationally indexed by a servo motor 31. It's becoming like that. This workpiece support 30 has four mounting surfaces parallel to the rotation axis of the workpiece support 30.
SA1 to SA4 are formed on the outer periphery, and these 4
Workpieces W are attached to the four attachment surfaces SA1 to SA4. As the servo motor 31 rotates, one of the four mounting surfaces SA1 to SA4 faces the main shaft 26 and is rotationally indexed to be orthogonal to the axis of the main shaft 26. Note that the servo motor 31 rotates in response to a command pulse distributed as a B-axis command pulse to the servo motor drive circuit DUB.

Next, to explain the operation of the central processing unit 10, the central processing unit 10 first performs processing for automatic programming as schematically shown in FIG. 2 to machine the workpiece W. Create a numerical control program for this and store it in the NC data area in random access memory RAM1. Thereafter, the numerical control execution routine shown in FIG. 6 is executed to perform processing according to the numerical control data stored in the random access memory RAM1.

This numerical control execution routine reads the numerical control data stored in the random access memory RAM1 one block at a time, distributes pulses to each axis accordingly, and at the same time processes auxiliary functions, etc. Since the operation is similar to that of a numerical control device, a detailed explanation will be omitted, and the automatic programming process, which is a feature of the present invention, will be explained below.

The processes performed by the central processing unit 10 during automatic programming include, as shown in FIG. The process can be roughly divided into four steps, and these processes are executed in order.

() Defining the shape of the workpiece This step is a step in which the external shape of the workpiece to be machined by the machine tool 20 is defined as the shape of the workpiece, and the detailed process of this step is shown in Fig. 3a. . When machining is performed by mounting multiple types of workpieces W on the workpiece support stand 30 of the machine tool 20, the material shape is defined for each workpiece by repeating the process shown in FIG. 3a. It's becoming like that.

That is, in step 40 of FIG. 3a, the central processing unit 10 displays the rectangular parallelepiped and the cylinder on the display screen 1 of the CRT display device 12, as shown in FIG. 7a.
2a as a plan view and an elevation view, and the operator is instructed to input using the keyboard 11 whether the overall shape of the workpiece W is a rectangular parallelepiped or a cylinder. On the display screen, (A) is displayed on the top of the rectangular parallelepiped, and (B) is displayed on the top of the cylinder, and if the overall shape of the workpiece W is a rectangular parallelepiped, the operator selects "A". If the object is a cylinder, the operator operates the "B" key. Furthermore, at the same time, a message "SOZAI BANGOU 1" is displayed on the lower end of the display screen 12a, and the central processing unit 1 informs that the workpiece W whose material shape is to be defined from now on is the workpiece with the material number 1.
Inform the operator that it is recognized by 0.

Now, suppose that four types of workpieces W1 to W4 with different shapes are mounted on the workpiece support stand 30 and processed. First, in order to define the material shape of the workpiece W1, Perform the key operation. For example, if the workpiece W1 is
If the workpiece W1 is a rectangular parallelepiped, as shown in FIG. In response, the central processing unit 10 stores the input data and moves to step 41,
As shown in FIG. 7b, a scaling zone 1 is provided at the left end of the screen of the CRT display device 12.
In 2b, the plan view and elevation view of a rectangular parallelepiped with a certain shape are displayed vertically, and on the right side of the screen, the dimensions a,
A comment requesting input of each data of dimension b in the Y-axis direction (vertical) and dimension h in the Z-axis direction (height) is displayed.

When the operator inputs dimension data in response to this, the central processing unit 10 reads and temporarily stores the data, and then proceeds to step 42. When proceeding to step 42, as shown in FIG. 7c,
A plan view and an elevation view of a rectangular parallelepiped having lengths in the vertical, horizontal, and height directions proportional to the dimension values input in the scaling zone 12b of the screen are displayed.
At the same time, the right side of the display screen 12a displays the comment "Betsu no Sozaiari?", and if there is another material, press the "1" key, and if there is no other material, press the "2" key. ” is displayed to indicate that the key should be operated.

In this embodiment, four types of workpieces W1 to W4 are attached to the workpiece support stand 30, and only the material shape of the workpiece W1 is defined by the above operation. Operate the "1" key to define the shape of the material. As a result, the central processing unit 10 returns from step 43 to step 40 and performs the process of defining the shape of the material again. As shown in Figure 10b, the workpiece W
Since 2 is also a rectangular parallelepiped, operate the "A" key here in the same way as in the same case, and the central processing unit 1
0 is informed that the workpiece W2 is a rectangular parallelepiped. In this case as well, the screen shown in FIG. 7a appears on the display screen 12a at step 40, but in this case, a message "SOZAIBANGOU 2" is displayed at the bottom of the screen, and the operator can check the shape of the material. It can be seen that the central processing unit 10 recognizes the workpiece W2, which is defined as the workpiece No. 2. After that, the material dimensions of the workpiece W2 are entered by the same operation as in the previous case, and when this is completed, a screen similar to that shown in Fig. 7c is displayed again, and it is possible to check whether there is another material. The central processing unit 10 asks the question.

In this case, since the shapes of the workpieces W3 and W4 are still undefined, the "1" key is operated again and the above process is repeated. When all the shape definitions of the workpieces W1 to W4 are completed, when the screen shown in Fig. 7c is displayed, if you operate the "2" key indicating that there is no other material, the central processing The apparatus 10 moves from step 43 to step 50 in FIG. 3b to complete the process of defining the shape of the material.

() Definition of workpiece attachment position This definition of workpiece attachment position is for workpieces W1 to W4 whose material shape has been defined by the above process.
defines on which mounting surface and at which position the workpiece W is to be placed on the workpiece support base 30, and for each mounting surface, the workpiece W to be mounted on that surface and the mounting position are defined. I'm starting to do that.

That is, when the central processing unit 10 moves to step 50 in FIG. 3b, it scales a figure in which the mounting surface is represented by a line on an abstraction of the spindle head and table of the machine tool, as shown in FIG. 8a. In addition to displaying in zone 12b,
A comment indicating that the index angle θ of the mounting surface SA1 should be entered is displayed on the right side of the screen.

In response to this, when the indexing angle θ of the first mounting surface SA1 is input, the central processing unit 10 reads the input data and moves from step 50 to step 51, as shown in FIG. 8b. As shown, a comment indicating that the material number of the workpiece W to be attached to the attachment surface SA1 should be input is displayed on the display screen 12a. For example, the first
As shown in Figure 1a, the first mounting surface SA
1, the workpieces W1 and W2 are to be attached to the workpiece W1. At this stage, the material number 1 of the workpiece W1 is input. As a result, the central processing unit 10
It is recognized that the workpiece W1 is attached to the attachment surface SA1. After this, the central processing unit 1
0 means that in step 52, the workpiece W1 is the first
A comment asking how many pieces can be attached to the attachment surface SA1 is displayed, and in response to this, the operator inputs "2" as the number of pieces to be attached to the first attachment surface SA1 of the workpiece W1.

Thereafter, the central processing unit 10 continues to step 53, and as shown in FIG. W reference position and machine tool X, Y
A dimensional relationship diagram showing that the deviations in the X and Y axis directions from the center position of each mounting surface, which is the reference position on the plane, are respectively x and y, and the distance from the top of the table to the bottom of the work surface W is z. At the same time, it is displayed in the scaling zone 12b to instruct the operator to input these data.

In this case, the first mounting surface SA of the workpiece W1
Since it was defined in step 52 that the number of objects to be attached in 1 is two, two sets of x and y data are input corresponding to the attachment positions of the two workpieces. When the dimensional data corresponding to each of x, y, and z is input, the central processing unit 10 moves from step 53 to step 55, and as shown in FIG.
As shown in , a comment asking whether there are different types of workpieces on the same mounting surface is displayed on the display screen 12a.

In this case, the workpiece W is placed on the first mounting surface SA1.
Since workpiece W2 is also attached outside of 1,
At this stage, the "1" key is operated to notify the central processing unit 10 that a different type of workpiece will be mounted on the first mounting surface SA1. Thereby, the central processing unit 10 returns from step 55 to step 51 and repeats the above-described process. Since the workpiece W2 has a material number 2, when the worker is asked about the material number in step 51, he inputs 2 as the material number. In addition, the first mounting surface SA1
Since only one workpiece W2 is attached to the workpiece W2, "1" is inputted as the material number data in step 52, and in step 53, the above-mentioned x which defines the attachment position of the workpiece W2 on the first attachment surface SA1 , y, z data.

When the input of the mounting position data regarding the workpiece W2 is completed in this way, the "2" key is operated when the screen shown in FIG. 8d is displayed on the display screen 12a. As a result, the central processing unit 10 has the workpiece W1 and the workpiece W1 on the first mounting surface SA1.
It is determined that no workpiece other than W2 can be attached, and the process moves from step 55 to step 56, completing the definition of the workpiece attachment position with respect to the first attachment surface SA1. The mounting position data regarding the workpieces W1 and W2 input in this way is stored in the memory RAM 1 which stores the number of the workpiece to be mounted and its mounting position for each mounting surface, as shown in FIG. 12a. It is written and stored in the installation position table STDT in the table.

Step 56 is a step for displaying the mounting state of the workpieces W1 and W2 on the first transfer surface SA1 whose mounting positions have been inputted by the above operation according to the inputted mounting position data.
As shown in FIG. 8e, a diagram in which the workpieces WA1 and WA2 are arranged on the mounting surface according to the input mounting position data is displayed on the display screen 12a. The operator looks at this display screen and confirms whether or not the mounting position data has been entered correctly. If the operator confirms that the data has been entered correctly, he operates the "1" key here.

This causes the central processing unit 10 to proceed to step 5.
Step 7 moves to step 58, and as shown in FIG. Inquire. In this embodiment, other mounting surfaces SA2 to SA
4 is also attached to the workpiece W, and since it is necessary to define their attachment positions, the "1" key is operated here. Then, the central processing unit 10 returns from step 58 to step 50.
By the same process as above, the second mounting surface
Data on the index angle θ of SA2 and the mounting positions of workpieces W3 and W4 mounted on this second mounting surface SA2 are input in order.

By repeating this operation further,
A workpiece W2 attached to the third attachment surface SA3,
After entering data on the mounting position of the workpiece W3 to be mounted on the fourth mounting surface SA4 and completing this process, the operator operates the "2" key when the screen shown in Fig. 8f is displayed in step 58. , thereby causing the central processing unit 10 to proceed to step 5 to complete the process for defining the workpiece attachment position.
8 to the machining definition routine shown in FIG. 3c.

() Definition of machining This definition of machining is for inputting data to define the machining position and machining shape for each of multiple types of workpieces mounted on the workpiece support 30, and is shown in Fig. 3c. Step 6
0, first, as shown in Fig. 9a, a comment "Softworking tool 1" is displayed, indicating that the processing definition to be performed now is related to the workpiece W1 whose material number is No. 1. When the worker recognizes this and operates the "RETURN" key, the central processing unit 10 moves to step 61, and as shown in FIG. The tools to be used, ie, tools such as center drills, drills, taps, etc., are displayed in an abstract manner, and the operator is asked to select which tool will be used to perform the machining in the first machining process.

For example, as shown in FIG. 10a, the workpiece W
In step 1, if we drill through holes with the same diameter at the four corner machining positions P11 to P14, and then perform tap machining with the same diameter, the "2" displayed above the drill at this stage Enter the number. As a result, the central processing unit 10
It is identified that the machining of the first step in step 1 is drilling, and in step 61, an abstract figure of the drill hole is drawn as shown in FIG. 9c.
displayed on the display screen 12a of the CRT display device 12,
The operator is instructed to input data representing the diameter d and depth l of the hole.

In response to this, when the dimensions of the hole diameter d and depth l are input, the central processing unit 10 executes step 6.
Moving on to 3, as shown in Figure 9d, we define the abstract figure of the hole, the distances in the x-axis and y-axis directions from the center of the hole to the reference position of the workpiece as x, y, and the distance of the tool. A dimensional relationship diagram in which the return amount from the top surface of the workpiece and the air cut amount are represented by c and a is displayed on the screen, and instructions are given to input these data.

In response to this, the operator sequentially inputs the positions of the four corner holes on the workpiece W with reference to the drawing, and then inputs the data of the return amount c and the air cut amount a, and the central processing unit 10 After reading the input data, the process moves from step 63 to step 65, and as shown in FIG. 9e, the hole shape according to the input hole position data is superimposed on the material shape and placed in the scaling zone 12b. indicate. At the same time, a comment is displayed on the right side of the screen asking the operator whether there is any further processing to be done.

In this case, it is necessary to perform tap machining at machining positions P1 to P4 following drilling at machining positions P1 to P4, so if the "1" key is operated here, the central processing unit 10 will proceed to step 6.
7 returns to step 61, and processing for defining tap machining on the workpiece W1 is performed.
That is, in step 61, the operator
When the screen shown in Figure b is displayed, operate the "3" key displayed on the tap tool to inform the central processing unit 10 that the second process is tapping.
Let me know.

In response to this, the central processing unit 10 displays the screen shown in FIG. Thread diameter d,
Input the data for the screw length l. Furthermore, in step 63, position data for the machining positions P1 to P4 where tapping is to be performed is input in the same manner as in the first step, thereby completing the machining definition in the second machining step.

When the machining definition of the workpiece W1 is completed in this way, the screen of FIG. 9e is displayed in step 67, and the "2" key is operated assuming that there is no additional machining of the workpiece W1. Then, the central processing unit 10 moves from step 67 to step 68, and displays a comment on the screen inquiring whether there are any other workpieces for which machining definition has not been completed, as shown in FIG. 9g. .

In this case, the workpieces W2 to W4 are still undefined, so if the "1" key is operated here, the central processing unit 10 goes to step 68.
Then, the process returns to step 60, and the machining definition for the workpiece W2 is performed in the same manner as above, and when this is completed, the machining definition is performed for the workpieces W3 and W4 in the same manner.

The data representing the machining shape and machining position input for each workpiece in this way is stored in the memory.
As well as being input into the data area of RAM1, based on this information, as shown in Figure 12b, the type and size of the machining tool used in each machining process, and the type and size of the machining tool used in each machining process are determined for each workpiece. A machining data table MDT is created that stores data representing the machining position where machining is performed. Also, this processing data table
The MDT has an area for writing a machining completion mark* for each machining process of each workpiece.

() Creation of numerical control data When the machining definition for each workpiece is completed through the above process, the central processing unit 10 moves to step 70 in FIG. Start creating an efficient numerical control program.

First, in the first step 70, the contents of the work counter WC, which specifies the workpiece W, and the process counter SC, which specifies the process number, are set to 1, and then the process moves to step 71, where the work counter
Reads machining data regarding the workpiece W1 specified by WC from the machining data table MDT,
At step 72, it is detected whether or not the process designated by the process counter SC has been completed by checking whether a process completion mark "*" has been written. At the start of program creation, all machining completion marks have been erased, so it is determined that no machining completion marks have been written, and the process moves from step 72 to step 75.
In step 75, it is determined what kind of tool is used in the process specified by the process counter SC and what is the size of the tool.
The tool number of the corresponding tool is read with reference to a tool data file (not shown). For example, the workpiece W
If the tool used in the first machining step of 1 is a 10φ drill, the tool number attached to the 10φ drill is read from the tool data file. At the same time, the tool number of the 11φ tap used in the second machining process of the workpiece W1 is similarly identified.

In this way, once the tool selection is complete,
Moving from step 75 to step 76, the 10φ drill used in the first machining process of the workpiece W1 is indexed to the tool exchange position and attached to the main spindle.
After this, a numerical control program will be created to index the 11φ tap to the tool exchange position to be used in the next process.

Once this process is complete, steps 76 to 7
7, it is determined whether there is a machining location other than workpiece W1 that can be machined by the tool selected in step 75, in this case a 10φ drill, and if so, the machining location is detected. do.
In other words, the processing data table in Fig. 12b
Referring to MDT, during the machining process of each workpiece
Determine whether or not there is a machining process in which a 10φ drill is used, and if a 10φ drill is used, record it in the same machining location table SMPT shown in Figure 12c. The workpiece number and its machining position data are transferred to the workpiece W.
1 workpiece number and machining position P in the 1st machining process
11, write following the data of P14.

For example, if the machining position P25 of the workpiece W2 in the second process and the machining positions P31 to P32 of the workpiece W3 in the first process can be machined with a 10φ drill, the workpiece can be machined by the above process. W
Processing points P11 to P1 in 1, W2, and W3
4, P25, and P31 to P32 are written in the same machining location table SMPT in association with the respective workpiece numbers.

In this way, when a machining location that can be machined with a 10φ drill is selected among the machining locations defined for each of the plurality of types of workpieces, the central processing unit 10 executes steps 77 to 8.
0 and the above mounting position data table
Referring to SPDT and the same machining location table SMPT, each mounting surface SA1~ on the workpiece support stand 30
For each SA4, detect the location on the mounting surface of the machining location that can be machined with a 10φ drill, and calculate its coordinate values.

The details of this process are shown in FIG. 4. First, in step 80b, one of the workpieces having a machining location that can be machined with a 10φ drill is selected by referring to the same machining location table SMPT. After that, in step 80c, the workpiece is identified by the mounting surface designation counter WSC.
Refers to the mounting position data table SPDT to determine whether or not the mounting surface is mounted on the specified mounting surface. If there is a workpiece that can be machined, the process moves from step 80c to step 80d, and data on the machining position on the workpiece that can be machined is read from the same machining location table SMPT.

Due to the above operation, first mounting surface SA1
It is detected whether there is a workpiece above that can be machined with a 10φ drill, and in this case, the machining positions P11 to P14 of the workpiece W1 and the workpiece W2 are
Since the machining position P2 of the workpiece W1 can be machined, the position data of the machining positions P11 to P14 of the workpiece W1 are first read from the same machining location table SMPT by the above operation.

In addition, in step 80e following this, data of the mounting position on the first mounting surface SA1 of the workpiece W1 is stored in the mounting position data table.
Read from SPDT, and in step 80f,
By adding this mounting position data and the machining position data read in step 80d, the XY coordinate values of the machining positions P11 to P14 are calculated as absolute coordinate values. In this case,
When there is multiple mounting position data for a workpiece, that is, when multiple pieces of the same workpiece are mounted on the same mounting surface, each of the multiple mounting position data and the above machining position data are combined. By performing addition operations, all the absolute coordinate values of machining positions on multiple same workpieces are calculated, and the machining position table shown in Fig. 12d is created.
Write to MPDT. As a result, the first mounting surface SA
The absolute coordinate values of the machining positions P11 to P14 of the two workpieces W1 attached to the workpiece W1 at different positions are calculated, respectively, and the machining position table MPDT is created.
written to. In the machining position table MPDT, data P11' to P14' are absolute coordinate values corresponding to the machining position of one workpiece W1,
The data of P11″ and P14″ is the other workpiece W1
These are the absolute coordinate values corresponding to the machining position. Further, in step 80g, machining information common to these machining positions, ie, data such as the position of the machining start point in the z-axis direction and the depth of the machined hole, is written into the machining position table MPDT.

In this way, when the coordinate values of the machining positions P11 to P14 of the workpiece W1 to be attached to the first attachment surface SA1 are calculated, step 80
Returning to step b, it is detected with reference to the same machining location table SMPT whether or not there is another workpiece that can be machined with the same machining tool on the same mounting surface, and if there is, the processing from step 80d onwards is performed again. In this case, the machining point P25 can also be machined on the workpiece W2 attached to the first machining surface SA1.
Therefore, the processing from step 80d onward is performed again, and the absolute coordinate values of the machining position P25 of the workpiece W2 are calculated and the machining position table MPDT is
and when this is completed, step 80
Transition from c to 80h.

When moving to step 80h, it is determined whether the mounting surface designation counter WSC has designated the final mounting surface, and if the final mounting surface has not been designated, the process moves to step 80b via step 80i.
After moving to and advancing the mounting surface designation counter WSC, perform the same processing as in the above case.

This determines whether or not there is a workpiece attached to the second mounting surface SA2 that can be machined with a 10φ drill, and if there is a workpiece that can be machined, its coordinates The value is calculated and written to the machining position table MPDT.
In this embodiment, the machining position P31 of the workpiece W3,
Since P32 can also be machined with a 10φ drill, the absolute coordinate values of these machining positions P31 and P32 are written in the machining position table MPDT.

By repeating the same operation, the third mounting surface
Similar processing is performed for the workpieces W2, W2 on SA3 and workpieces W3, W3 on the fourth mounting surface SA4, and when this is completed, steps 80h to 8
0j, and a machining completion mark “*” is placed in the area corresponding to the machining process using a 10φ drill as the tool in the machining data table MDT in Fig. 12b.
After that, the process moves to step 81 in FIG. 3d.

This step 81 is based on the machining position table.
This is the step of creating a numerical control program for continuously machining the machining positions written in the MPDT, and the details of this step are shown in FIG. In this process, steps 81d~
Steps up to step 81g are the parts for creating a program that sequentially positions the tool at multiple machining positions within the same mounting surface and performs machining.
At step d, one piece of machining position data is read from the machining position table MPDT, and at step 81e, the amount of movement for positioning the tool to the read machining position is calculated, and a movement command program is created according to this amount of movement. Then, in step 81f, a machining program corresponding to the type of machining, in this case since the machining tool is a drill, a program for moving the spindle head up and down along the z-axis to perform drilling is created. Furthermore, after this, in step 81g, the machining position from which the machining position data is read is changed,
Returning to step 81d, the above processing is performed again. As a result, a program for sequentially machining machining positions that can be machined with a 10φ drill within the same mounting surface is created, and once a machining program up to the final machining position within the same machining surface is created, the process starts from step 81h. The process moves to step 81k via step 81i.

When starting to create a machining program, the mounting surface designation counter SC is set in step 81b.
is set to 1, the processing positions P11' to P11' on the first mounting surface SA1 are changed by the above process.
A program is created to sequentially process up to 25'. Then, when moving to step 81k,
Rotate the workpiece support stand 30 by 90 degrees to attach it to the second mounting surface.
Create a program to index SA2 to the machining position, then increment the mounting surface designation counter SC in step 81l, and then proceed to step 81c.
Return to Then, check the mounting surface designation counter SC again.
The mounting surface specified by , that is, the second mounting surface SA2
It is identified by referring to the machining position table MPDT whether or not there is a place to be machined on the second mounting surface SA2. A program is created to sequentially machine machining locations P31' and P32' that can be machined with a 10φ drill among the machining locations in .

Furthermore, the above process is applied to the third and fourth mounting surfaces.
This was also carried out for SA3 and SA4, and the workpiece W1
A program is created for machining all the machining points on the mounting surfaces SA1 to SA4 that can be machined with the 10φ drill used in the first machining process in the same machining process.

When this process is completed, the central processing unit 10 passes through step 82 of FIG. 3d to step 73.
After moving to and advancing the process counter SC,
Return to step 72 and display the machining data table.
The area corresponding to the next machining process of MDT, that is, in this case, the work counter WC is 1 and the process counter SC is 2, so the area corresponding to the second machining process of workpiece W1 is processed. It is determined whether the completion mark "*" has been written. In this case, since it has not been written, the process moves from step 72 to step 75.

Thereby, in step 75, after selecting the tool to be used in the next machining process, that is, in this case, the tool to be used in the first machining process of workpiece W2, in step 76, the tool used in the second machining process of workpiece W1 is selected. Attach the 11φ tap used in the machining process to the main shaft, and attach the first tap of workpiece W2.
Create a numerical control program to index the tool used in the machining process to the tool exchange position.

After this, the process moves to step 77, where the machining locations that can be machined with the 11φ tap are selected using the same process as in the case of drilling described above, and these locations are selected using the processes of steps 80 and 81. A program for sequentially machining the machining locations of , regardless of the type of workpiece or mounting surface, is created as described above. Note that for the second and subsequent workpieces, there are processes that have been completed in the previous workpiece machining, so in step 72,
Whether or not the next machining process will be performed using an already created program is determined by whether or not a machining completion mark "*" is written in the corresponding machining process in the machining data table MDT. Nowadays, the machining process in which machining is performed using a given program is skipped and a numerical control program is created instead.

In this way, when the creation of the numerical control program based on the processing information input in an interactive manner is completed, the central processing unit 10 enters a standby state,
After that, when a machining command is generated, the program shown in Fig. 6 is executed to sequentially execute the created numerical control program, and
To accurately machine a plurality of workpieces W1 to W4 on 0 as defined. In this case, since the workpieces W1 to W4 are machined not for each workpiece but for each tool used, the frequency of tool replacement is minimized and highly efficient machining can be performed.

As described above, in the present invention, from the machining information defined for each workpiece for a plurality of workpieces placed on a workpiece support, it is possible to determine whether the same tool This system creates a numerical control program that selectively identifies machining locations that can be machined using the same machining process and creates a numerical control program that continuously processes the identified machining locations in the same machining process. Even when multiple workpieces are attached and machined continuously, simply inputting machining information for each workpiece creates an efficient numerical control program that reduces the frequency of tool changes.

Therefore, even when creating a highly efficient numerical control program that requires less frequent tool changes, machining information can be input for each workpiece at once, making it very easy to input machining information. It is possible to create an efficient numerical control program by simply inputting machining information, without the need for calculations that take into account factors.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram showing the configuration of a numerical control device with a schematic side view of the machine tool, and FIGS. A flowchart showing the operation of the processing device 10, FIG. 7a to FIG. 9g are diagrams showing the display screen of the display device 12 in FIG. 1, and FIG.
is a screen diagram displayed during the step of specifying the material shape, FIG. 7b is a screen diagram displayed during the step of inputting the dimensions of the material shape, and FIG. Screen diagram displayed during the inquiry process,
Figure 8a is a screen diagram displayed during the process of inputting the index angle of the mounting surface, and Figure 8b is a screen diagram displayed during the process of inputting the number and number of materials to be attached to each mounting surface. , FIG. 8c is a screen diagram displayed during the process of inputting the mounting position of each material, FIG. 8d is a screen diagram displayed during the process of inquiring whether there are different types of materials on the same mounting surface, Figure 8e is a screen diagram displayed during the process of inquiring whether or not there is a modification related to mounting, Figure 8f is a screen diagram displayed during the process of inquiring whether there is material on other mounting surfaces, and Figure 9 Diagram a
is a screen diagram displayed at the start of machining definition, Figure 9b is a screen diagram displayed during the process of selecting a machining tool, and Figure 9c is a process of inputting the machining shape when the machining tool is a drill. Figure 9 d is a screen diagram displayed during the process of inputting the machining position, Figure 9 e is a screen diagram displayed during the process of inquiring whether additional machining is required, Figure 9 g is a screen diagram that is displayed during the process of inquiring whether there are other workpieces that have not been processed, and Figure 9 f is displayed during the process of inputting the machining shape when the tool is a boring tool. 10 is a diagram showing multiple types of workpieces that can be machined with a common tool, and FIG. Figures 12a to 12d showing the installed state are diagrams showing data tables used to create a numerical control program. 10...Central processing unit, 11...Keyboard,
12...Display device, 12a...Display screen, 12b
...scaling zone, 13...pulse generation circuit, 30...workpiece support, MDT...machining data table, MPDT...machining position table,
RAM1, RAM2...Random access memory,
ROM...Read-only memory, SA1 to SA4...Mounting surface, SMPT...Same machining location table, SPDT
...Mounting position data table, W...Workpiece.

Claims (1)

[Claims] 1. Machining information for defining the machining position and machining shape on the workpiece is input, and a numerical control program for machining the workpiece based on the input machining information is executed. In a numerical control device with an automatic programming function that creates a numerical control program and controls a machine tool according to the created numerical control program, a plurality of workpieces are placed on a workpiece support of the machine tool. A data input means is provided for inputting the above machining position and machining shape for each workpiece, as well as inputting position data defining the respective attachment positions of the plurality of workpieces. A machining position identification means is provided for identifying a machining position that can be machined by the same tool among a plurality of machining positions on a plurality of workpieces placed on the workpiece support based on the data; Program creation means for creating a numerical control program for successively machining a plurality of machining positions on the plurality of workpieces, which are identified by the machining position identification means as machinable by the same tool, in the same machining process; A numerical control device equipped with an automatic programming function. 2. When there are workpieces having the same machining shape among a plurality of workpieces placed on the workpiece support, the data input means inputs the machining information for only one workpiece on behalf of the workpieces. and mounting position information are input together with the workpiece type number, and for other workpieces with the same machining shape, the mounting position information and workpiece type information are input, and the machining position identification means and program creation means Automatic programming according to claim 1, characterized in that for workpieces for which no information has been input, the automatic programming is equipped with a function of searching input information for corresponding machining information based on workpiece type information. Numerical control device with functions. 3. The data input means defines the machining information for a plurality of workpieces attached to a plurality of mounting surfaces provided on the workpiece support base and indexed to machining positions by rotational indexing of the workpiece support base. At the same time, the mounting position of each workpiece is input in combination with data representing the mounting surface of each workpiece and the position of the workpiece on the mounting surface.
The machining position identification means has a function of identifying machining positions of the same machining shape for workpieces attached to the plurality of mounting surfaces, and the program creation means has a function of identifying machining positions of the same machining shape for workpieces attached to the plurality of mounting surfaces. Claim 1 or 2 creates a numerical control program for continuously machining the same machining shape of a workpiece while rotating and indexing the workpiece support. Numerical control device with automatic programming function as described in section.