JPH0421203B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention uses a computer to automatically create NC commands when automatically machining molds with complex shapes using an automatic shape processing method, particularly an NC (numerical control) machine tool. The present invention relates to an automatic shape processing method suitable for.

Conventionally, as this type of automatic shape processing method, one shown in the schematic configuration diagram of FIG. 1 is known. In FIG. 1, a computer 10 receives an input signal 100 from a keyboard 12 for inputting input data, and outputs an output signal 100 to a numerically controlled machine tool 14.
2, CPU (Central Processing Unit) 1
6, an input circuit 18, an output circuit 20, a program memory 22, and an output display device 24 for the calculation results of the CPU 16.

In the schematic configuration shown in FIG.
Part Surf S 26, Drive Surf S 28, and Check Surf S 30 shown in FIG.
The operation of the conventional method for giving the coordinates or parameters of the equation will be explained below.

First, part surf system data 26, drive surf system data 28, and check surf system data 30 are given as input signals 100 from the keyboard 12 to the computer 10 one by one for all machining surfaces. The part surf S data 26 given to each machined surface is a signal that controls the depth of cut, and the drive surf S data 28 is a signal that controls the cutter 32.
The check surface data 30, the control signals that guide the movement of the cutter during machining, are the signals that control a given operating command.

In the case of the example shape shown in FIG. 3, at least 14 sets of the above control signals are applied. A program for automatically calculating this shape is stored in the memory 22 in advance, and when an input signal 100 is given to the computer 10, an NC command for machining this shape using the numerically controlled machine tool 14 is automatically issued. Calculation is created.

In addition, in the schematic configuration shown in FIG. 1, as the input signal 100 for processing the example shape shown in FIG. 3, the shape (A) 34, shape (B) 36, and shape (C) 38 shown in FIG. Data and operations ∩, , ∪
Another conventional example that provides the following will be explained. First, as the input signal 100, the shape (A) 34 shown in FIG.
When data of shape (B) 36 and shape (C) 38 and operators ∩, , ∪ are given to the calculator 10 from the keyboard 12, the calculator 10 performs the calculation (A)∩(B)(C),
Create such a shape. Further, by providing a machining control signal as the input signal 100, an NC command for machining the created shape using the numerically controlled machine tool 14 is automatically created.

The conventional shape automatic machining method explained based on FIGS. 1, 2, and 4 uses the part surf S 26, drive surf S 28, It is necessary to judge all the check surfaces 30 and provide them as data, and in the case of complex shapes, there are many problems such as an increase in data preparation time and an increase in errors in surface judgment.

In addition, as the input signal 100 for processing the shape example shown in FIG. 3, the shape (A) 34 shown in FIG.
In the case of the conventional example in which the data of shape (B) 36 and shape (C) 38 and operations ∩, , ∪ are given, when compared with the conventional example shown in Fig. 2, the error in surf S judgment is eliminated, but the concept of machining is If there is a gap between the
There were many problems, such as an unavoidable increase in data creation time.

The present invention was made in view of the above-mentioned conventional problems, and its purpose is to provide a computer with a spatially closed shape having a newly created surface on the top surface as an input signal. In addition, by giving operations based on machining as control signals to a computer, even in the case of complex shapes, the workpiece shape can be calculated in a short time and with fewer errors, without departing from the concept of machining, for automatic machining. The object of the present invention is to provide an automatic shape processing method that enables creation of numerical control commands.

In order to achieve the above object, the present invention provides an automatic shape machining method in which a numerical control command is created using a computer, and a numerically controlled machine tool is controlled by the numerical control command to automatically machine a desired shape. The workpiece is machined by giving the computer a spatially closed three-dimensional shape with a new surface on the upper surface as a control command for the initial shape of the workpiece. A numerical control command is created, and the control command for the three-dimensional shape is repeatedly given to the computer, which extracts the overlapping parts between the three-dimensional shapes,
The present invention is characterized in that numerical control commands for the desired final shape are created and automatically processed by performing arithmetic processing such as non-overlapping portion extraction, addition processing, subtraction processing, etc.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. FIG. 5 is a conceptual diagram showing one embodiment of the present invention, and the same parts as those in FIG. In FIG. 5, a control signal 104 is input to a CRT (cathode ray tube) by a light pen 40, or a digitizer 42,
This control signal is input via the keyboard 12 and controls the machining shape. Hereinafter, a method of controlling the automatic shape machining method of the present invention will be explained based on FIG. For comparison with the conventional example, consider the shape shown in FIG. 3 as an example of a shape created by automatic processing. First, data of shape (P) 44 and shape (Q) shown in FIG. 6 are given as input 7 signals 100. This data can be given in accordance with a normal three-dimensional shape input method in an NC control device, but in this example, it can also be done by inputting the coordinates of six vertices. Here, in the present invention, among the surfaces newly created by processing the input signal 100,
Gives a spatially closed shape whose top surface has a surface whose normal vector is not perpendicular to the Z-axis. That is, in the shape of Fig. 3, the upper part in the figure is Z.
In the case of the axial direction, the top surface corresponds to this because the normal vector to that surface is parallel to the Z-axis, and the side surface does not fall under this because the normal vector to that surface is perpendicular to the Z-axis. Therefore, by giving as one input data a spatially closed shape whose uppermost surface is the uppermost surface in FIG. 3, that is, the shape (P) 44 shown on the left in FIG. A closed shape with the upward facing surface as the top surface, that is, the shape (Q) shown on the right in FIG. 6, is given as another input data.

On the other hand, the NC command that controls the numerically controlled machine tool 14 is output to the servo motor so that the cutter 32 moves from the current value (P _i ) 48 to the target value (P _i+1 ) 50 as shown in FIG. It is calculated as a signal.

A program for automatically calculating the shape of the workpiece is stored in advance in the memory 22, and by giving input signals and control signals 104 to the computer 10, NC commands are automatically calculated and created.

In this example, the operation ← is given as the control signal 104. Therefore, this operation ← will be explained based on FIG. 6. This operation ← indicates (P·xy)+Q. Here, P is the above-mentioned shape (P) 44, Q is the above-mentioned shape (Q) 46, operation is AND, operation + is OR, Qxy is X of shape (Q),
A shape obtained by moving the projected shape onto the Y plane infinitely in the Z-axis direction, where xy means NOT the shape Qxy. Therefore, by calculating the shape data, (P・
xy) is x from shape (P) to shape (Q) in Figure 6,
It means a shape excluding the overlapping portion in the y plane, that is, a shape obtained by removing the shape (Q) in FIG. 6 from the shape shown in FIG. 3. Then, by adding the shape (Q) to this, the formula (P xy) + Q becomes the third
It means the shape of the figure. In addition, AND
Operations such as (•) and OR (+) can be performed using circuits or software, similar to the operations of well-known computers.

As described above, according to the present invention, a spatially closed three-dimensional shape (for example, the shape (P) and shape (Q) shown in FIG. 6) having a surface newly created by processing on the upper surface can be created. By calculating this, it is possible to understand the machined shape (for example, the shape shown in FIG. 3). Therefore, numerical control commands can be created very efficiently.

In FIG. 9, the shape given as the input signal 100 is the same as that explained in one embodiment, and the control signal 100 is
4 shows the result of the NC command automatically calculated by giving operation 1. Here, it is a signal for executing operation 1 (P.xy)+(P.Q) in terms of circuitry and software.

As described above, the automatic shape machining method of the present invention can create NC commands by calculating complex shapes such as molds, and can easily perform automatic machining using numerically controlled machine tools using these commands. Effects such as being able to create a desired shape in a short period of time can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram explaining a conventional shape automatic processing method, Fig. 2 is an input signal diagram of the conventional method,
Fig. 3 is a concave shape diagram, Fig. 4 is a diagram of other input signals of the conventional method, Fig. 5 is a schematic configuration diagram explaining an embodiment of the automatic shape processing method of the present invention, and Fig. 6 is an input signal diagram of the present invention. FIG. 7 is a schematic diagram showing an example of a signal, FIG. 7 is a diagram explaining an NC command, and FIGS. 8 and 9 are diagrams explaining the operation according to the present invention. In each figure, the same members are given the same reference numerals, 10 is the computer, 12 is the keyboard, 14 is the numerical control machine tool, 16 is the CPU, 18 is the input circuit, 20 is the output circuit, 22 is the memory, and 24 is the output Display device, 2
6 is part surf S (data), 28 is drive surf S (data), 30 is check surf S (data), 32 is cutter, 34 is shape (A),
36 to shape (B), 38 to shape (C), 40 to light pen, 42 to digitizer, 44 to shape (P), 4
6 is a shape (Q), 48 is a current value (P _i ), 50 is a target value (P _i+1 ), 100 is an input signal, 102 is an output signal, and 104 is a control signal.

Claims (1)

[Claims] 1. Machining is performed in an automatic shape machining method in which numerical control commands are created using a computer, and a numerically controlled machine tool is controlled by the numerical control commands to automatically machine a desired shape. A spatially closed three-dimensional shape with a newly created surface on the top is given to the computer as a control command for the initial shape of the workpiece, and a numerical control command for machining the workpiece is given to the computer. Furthermore, the control command for the three-dimensional shape is repeatedly given to the computer, which performs arithmetic processing such as extraction of overlapping parts, extraction of non-overlapping parts, addition processing, subtraction processing, etc. between the three-dimensional shapes. An automatic shape machining method that is characterized by creating numerical control commands for the desired final shape and automatically machining it.