JPH04157505A - Method for commanding oblique surface working - Google Patents

Abstract

PURPOSE:To easily obtain NC data with oblique surface working by preparing a part program based on an orthogonal coordinate system turning this oblique plane to be one plane on the coordinate system when working is performed on the work of the oblique plane which is not parallel with the three planes of the coordinate system of the working tool. CONSTITUTION:The part program working the oblique surface in the orthogonal coordinate systems Xa, Ya, and Za turning this oblique surface 20 to be one plane against the oblique surface 20 of a work W which is not parallel with the XY, YZ, ZX planes is prepared against machine coordinate systems XYZ. The preparation of the working part program on the oblique surface 20 becomes the same as the preparation of the normal part program, and the programming can be similarly performed as straight line cutting even when circle is cut on the oblique surface 20. Thus, the NC data can be easily prepared against the oblique surface working.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is a method for creating NC data from a part program.
The present invention relates to a C automatic programming system, and in particular to a diagonal surface machining instruction method that can easily obtain NC data for diagonal surface machining.

Conventional technology In the NC automatic programming system, the XY, YZ coordinates of the orthogonal coordinate system of the machine being machined are processed using NC data.

When creating NC data for machining diagonal planes that are not parallel to each ZX plane, conventionally the coordinate positions of each point on the diagonal plane are specified one by one using the coordinate values of the orthogonal coordinate system of the machine. Creating a part-time program. When machining a diagonal surface, it is more convenient and easier to create a part program using the diagonal surface as one plane of the orthogonal coordinate system, for example the XY plane, as the reference plane. I am creating a part program for machining diagonal surfaces.

There is also an automatic NC programming system that has the function of converting coordinate values written using a certain plane, for example, the XY plane as a reference plane, to a diagonal plane to obtain the coordinate values. Even in this case, commands for machining circular arcs cannot use this function.

The problem to be solved by the invention For the machine coordinate system that performs machining, the xy of that coordinate system
When trying to create NC data for machining a diagonal surface that is not parallel to the , yz, zx plane, it is easier to understand and convenient to create a part program in a coordinate system that uses the diagonal surface as one surface. Moreover, errors can be reduced.

Furthermore, if a part program that was created using a certain plane in the machine coordinate system as the reference plane already exists, and you want to perform the same machining on that plane on a diagonal surface, you may have to redo the same process. Creating a part program is inconvenient and inefficient.

In addition, even in an automatic programming system that has a function that can convert coordinate values written using a plane of one machine coordinate system as a reference plane to an oblique plane, if a part program contains instructions for machining an arc. If it is not possible to create NC data for diagonal surfaces, it will not be perfect and its use will be limited.

Therefore, the object of the present invention is to solve the problem of XY in the mechanical coordinate system.

To provide a diagonal surface machining command method that can easily create a part program and NC data for machining a diagonal surface that is not parallel to the yz, zx plane.

Means for Solving the Problems The present invention provides an NC automatic programming system that includes:
A part program is created using an orthogonal coordinate system in which the oblique plane to be machined is one plane. Then, a conversion matrix for converting the coordinate values on the orthogonal coordinate system into coordinate values on the coordinate system of the machine that performs the machining is commanded. In addition, for the arc commanded by the part program, divide the arc into minute straight lines, use the data in the part program as only straight line data to obtain each coordinate value, convert the coordinate value of each data using the above conversion matrix, and then calculate the machine coordinates. Convert to system coordinate values, and create NC data from the converted coordinate values.

Action As shown in Figure 2, xy,
For a diagonal surface of the workpiece W that is not parallel to the yz, zx plane, an orthogonal coordinate system XaYa with the diagonal surface as one plane
It is easy to create a part program for machining an oblique surface using Za because the coordinate system is a normal coordinate system. For the part program created in this way, a transformation matrix is defined that converts the coordinate values on the orthogonal coordinate system in which the above-mentioned diagonal surface is one plane to the coordinate values on the coordinate system of the machine that performs the machining, Coordinate values specified in a part program, and in the case of a circular arc part program, each coordinate value obtained by approximating this circular arc with a minute straight line is converted to a coordinate value in the machine coordinate system by multiplying this conversion matrix. Create NC data from the obtained coordinate values.

Example Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 3 is a block diagram showing the main parts of an NC automatic programming device according to an embodiment of the present invention. A ROM 13 storing programs is a RAM that stores system programs, part programs, and various data loaded from various floppy disks 9, and a RAM 4 stores NC data created by the NC automatic programming device.
C data storage memory, 5 keyboard, 6 disk controller, 7 C as graphic display
In the RT, each element 1 to 7 is connected to the CPU via a bus 8, and a floppy disk 9 serving as a system disk contains an NC that executes a part program input to the NC automatic programming device to create NC data. Programs for data creation processing, part program editing, NC data editing programs, etc. are stored.

Next, the operation of this embodiment will be explained.

First, it is assumed that the system program has already been downloaded from the floppy disk 9 to the RAM 3.

FIG. 1 is a flowchart of processing executed by the CPU of an automatic NC programming device according to an embodiment of the present invention. First, the NC automatic programming device is set to NC data creation mode, a part program is input from the keyboard 5, and each time a sentence (block) is input, the NL main key as an input command is pressed and turned on as in the conventional method. CPU
Step S to detect that the NL main key is turned on.
l) It is determined whether the input part program statement is a matrix command for converting the coordinate system (step S2).

For example, when processing the workpiece W on a plane 20 that is not parallel to the XY, YZ, and ZX planes of the machine coordinate system XYZ, as shown in FIG. When creating and inputting a machining part program based on one plane of the system, the coordinate system XaYaZa whose oblique plane is the XaYa plane in FIG. Define a matrix that transforms the value) into the machine coordinate system XYZ.

In Figure 2, assuming that the plane parallel to the plane obtained by rotating the XY plane of the machine coordinate system 45 degrees clockwise around the Y axis is an oblique plane 20, the part program is as follows. First, input the program and input the data to convert the coordinate values.

M1=TRNS, 50.0. -30 (1) M2=
YROT, 45A (2) M3=M2.
Ml (3) TRNS, ABS,
M3 (43 In the above part program, Ml, M2゜M3 means matrix, and the first sentence defines the origin as (X, Y, Z) = (50, 0, -30)
4. :, defines a matrix to be translated in parallel, the second sentence defines a matrix to rotate the coordinate system 45 degrees clockwise around the Y axis, and the third sentence defines a matrix Ml.

Matrix M that converts the coordinate values of the coordinate system XaYaZa of the diagonal surface into the coordinate values of the mechanical coordinate system xYz by multiplying by M2
3 is defined. The fourth statement is a control statement in which a command to perform coordinate transformation using matrix M3 using absolute values (ABS) is programmed.

When the above commands are input into the program and the CPU 1 detects the M code of the matrix command in step S2, the process moves to step S12, creates the commanded matrix, and returns to step S1. When sentences shown below as the first to fourth sentences are input, the processes of steps SL, 32, and 312 are repeated three times, and a conversion matrix M3 is created and stored.

If it is determined in step S2 that it is not a matrix command, the process proceeds to step S3, where it is determined whether the input sentence is a motion sentence. In the example of FIG. 2, the fourth sentence is input next to the matrix command, so the CPU assumes that it is not a motion sentence and moves from step S3 to step 813.
Commands other than exercise stationery are processed in the same way as before, but during this processing, if a TRN5 statement as shown in the fourth statement above, that is, a coordinate system conversion command, is input, flag F is set to "1". ”. Also, as will be described later, when the part program for machining an oblique surface is finished and before inputting the part program for machining another surface, rTRNS and 0FFJ are input to cancel the coordinate transformation. When detected, the flag F is set to "0".

In this way, processing other than exercise stationery is performed in step S13, and the process returns to step S1.

If the input part program is a motion statement command,
The process moves from step S3 to step S4, and coordinate values in the part program coordinate system are determined. In other words, when a creator of a part program inputs a part program that processes a diagonal surface, he or she first inputs coordinate values on the orthogonal coordinate system, in which the diagonal surface is one plane, as shown in sentences 1 to 4 above. Input the definition of the transformation matrix that converts to the coordinate values of the coordinate system and the control statement for executing the coordinate transformation. Then, use the orthogonal coordinate system with this diagonal surface as one plane as the coordinate system for creating the part program, and create the part program. Create and enter. As a result, the flag F is set to "1" by the process of step S13 at the time when the part program for machining the diagonal surface is inputted. Further, when the part program creator finishes the part program for machining the oblique surface 20, he inputs the control statements rTRNs and 0FFJ to set the flag F to "0".

When the coordinate values are obtained in step S4, it is then determined whether the flag F is "1" or not (step 85). If it is not "1", it is determined that this is not a part program for machining the oblique surface 20, and this coordinate value Step 514) to create NC data and store it in the NC data storage memory 4 in a more conventional manner;
Return to step S1.

Further, if the flag F is "1", it is determined whether the input command is an arc command or not (step S6). If it is not a circular arc command, it is a straight line command, so for the coordinate values obtained in step S4, The conversion matrix (M3) created in step S12 is applied to convert the coordinate values into the machine coordinate system (step S8), and NC data is created from the coordinate values and stored in the NC data storage memory 4 (step S9).
). Next, it is determined whether the input command is an arc command (step 510), and if it is not an arc command (return to step S1).

Furthermore, if it is determined in step S6 that it is a circular arc command, the commanded circular arc is divided into minute straight lines in the same way as in conventional linear approximation, and the coordinate values of the first minute straight line are determined (step 87).

Note that before inputting the arc command, input the allowable distance between the tangent of the arc and the approximate straight line for dividing the arc into minute straight lines as a control statement, and use the processing in steps SL and S2.83.313 to calculate this allowable value. This is stored, and in the process of step S7, the arc is divided into minute straight lines based on this storage tolerance value, and the coordinate values of each division point are determined.

The coordinate values of the minute straight line thus obtained are converted to coordinate values on the machine coordinate system by applying a transformation matrix, and NC data is created from these coordinate values. Step 38.89
), then it is determined whether the command is a circular arc or not, and if it is a circular arc command, it is determined whether or not it has exceeded the end point of the commanded circular arc.Step 8
10.5ll), if it has not been exceeded, the process returns to step S7 and the processes of steps 87 to S11 are repeated until the end point of the arc is exceeded, and NC data for each division point is created and stored in the NC data storage memory 4. When the end point of the arc is crossed in this way, the process returns to step S1, and the processes from step 81 onwards are repeated until the program end is input and detected in step S13.

In the above embodiment, an example was explained in which NC data is created while sequentially inputting one sentence of a part program using the keyboard and CRT 7. First, a part program is created, and then the NC data is created from this part program. may be created. In this case, step S1 in FIG. 1 is simply replaced with the process of reading out the part program one sentence at a time. In addition, when machining a diagonal surface in the same way using a part program that has already been created, the definition of the above conversion matrix is added before the part program statement for machining the diagonal surface in the part program editing process. It is sufficient to insert a control statement for the coordinate transformation command, and a control statement (TRNS, 0FF) for canceling the coordinate transformation command after the part program statement for completing the machining of the oblique surface.

Effects of the Invention In the present invention, the xy coordinate system of the machine that performs processing
, yz, When machining a workpiece with an oblique plane that is not parallel to the zx plane, a part program can be created based on an orthogonal coordinate system in which the oblique plane is one plane on the coordinate system. Creating a part program for machining on a surface is the same as creating a normal part program.
Part program creation becomes extremely easy and program errors can be eliminated. Further, even when cutting an arc on the diagonal surface, it can be programmed in the same way as straight line cutting, so a part program for cutting on the diagonal surface can be freely and easily created.

[Brief explanation of drawings]

Fig. 1 is a flowchart of the processing carried out by the NC automatic programming device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the part program creation coordinate system when machining an oblique surface of a workpiece, and Fig. 3 is NC implementing one embodiment of the present invention
FIG. 2 is a block diagram of main parts of an automatic programming device. W... Workpiece, 20... Diagonal surface, XYZ... Machine coordinate system, XaYaZa... Coordinate system for the diagonal surface. Patent applicant FANUC Corporation

Claims (1)

[Claims] In an automatic NC programming system that creates NC data from a part program, the part program is created in an orthogonal coordinate system in which the diagonal plane to be machined is one plane, and the coordinate values on the orthogonal coordinate system are used to calculate the coordinate values of the machine that performs the machining. A conversion matrix that converts to coordinate values on the coordinate system is specified, and the arc specified in the part program is divided into minute straight lines as only straight line data, and the coordinate values of each data are converted from the above conversion matrix. A diagonal surface machining command method that converts and creates NC data from the converted coordinate values.