JPS6379105A - Numerical controller - Google Patents

Abstract

PURPOSE:To improve the production efficiency of a working program by deciding automatically the partial tool locus data like a cutting start point, etc., of post-processing by storing and referring the tool locus of pre-processing. CONSTITUTION:It is decided whether the saved pre-processing has interference or not with the locus of a block which is under processing. If so, a working plane Z0 of pre-processing is defined as the height of the present work to set the internal storage. Then a cutting start point Z1, the working depth Z2, etc., are calculated. If no interference is recognized between said pre-processing and locus block, it is decided whether the height Z0 of the working plane is given or not. If so, the point Z1, the depth Z2, etc., are calculated. If not, an error return is decided. When interference is confirmed between the present working position and the tool width of the pre-processing locus, the height Z0 of the working plane is equal to the pre-processing height. Thus the working plane of the present processing is defined to obtain the point Z1 where the clearance is secured with the height Z0.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a numerical control device, particularly a numerical control device for a machine tool that controls the movement of a moving table in two axes, one that moves parallel to the main axis and one that is perpendicular to each other. It is related to.

[Prior Art] Fig. 5 is a block diagram showing a general conventional numerical control device (hereinafter referred to as NC). In Fig. 5, (1) is a machine body, (2) is a processing table, (3) is the spindle head,
(4a) is the sliding surface of the processing table (2), (4b) is the sliding surface of the spindle head, (5a) is a ball screw that is threaded through the nut (2a) of the processing table (2), and (5b) is the sliding surface of the processing table (2). Ball screws (6a) and (6b) are ball screws (5a) that are threaded through the nut (3a) of the spindle head (3).

(5b) drive servo motor (7a), (7b)
is the detector.

The spindle head (3) has a built-in spindle motor, which rotates the tool (9) attached to the chuck (8) and processes the workpiece (10) placed on the processing table (2) by moving it. I do.

The movement of each axis is controlled by the NC (11) using a servo motor (6a),
(6b).

(12) is a cable for connecting the NC (11) and the over unit attached to the machine body (1).

FIG. 6 shows a schematic configuration of the NC (11).

In FIG. 6, (13) is a CPU which controls the entire system, and (14) is a memory which is divided into a storage area for a control program that controls the system and a storage area for a program. (15) is a display for conveying information to the operator, (16) is an operation board with switches for controlling the system, and (17) is a data input device such as a tape league for inputting programs to the system. , (1
8) is an interface for inputting and outputting contact signals with the machine body, (19) is a servo circuit, and a detector (7a),
The difference between the detected position detected by (7b) and the command position output from the CPU (13) is converted into an analog voltage and applied to the servo amplifier (20), which amplifies the power and drives the servo motor (6).
a) and (6b) to move the processing table (2).

Next, the operation will be explained. The position of the processing table (2) is commanded using coordinate values from one shop as the origin. The points to which the processing table (2) should be moved are sequentially given one operation at a time in command blocks. Therefore, for example, when drilling a hole, the values of the tool's X, Y coordinates, and Z direction must first be determined from the drawing of the workpiece and the relationship with the machine origin, and then provided to the NC (11) as a program. . Picking up these coordinate values is a major part of the work load of creating a Canadian program.

[Problems to be Solved by the Invention] In general machining, first, as shown in FIG. processing, then the seventh
As shown in Figure (B), post-processing is performed by drilling holes in the processed surface using a tool (9a) such as a drill. In this case, since a movement trajectory must be created for each of tools (9a) and (9b), a common coordinate value Zo
Even if there is, the common coordinate value Z is used for each machining process. There was a problem in that it had to be picked up again from the drawing.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a numerical control device that improves the efficiency of creating a computer program.

[Means for Solving the Problems] The numerical control device according to the present invention stores the tool trajectory of pre-processing and refers to the tool trajectory, thereby saving some tool trajectory data such as the cutting start point of post-processing. It is equipped with logic that automatically determines the

[Operation] The logic in this invention improves the efficiency of creating a cutting program by storing and referring to the tool trajectory of the pre-processing and automatically determining part of the tool trajectory data such as the cutting start point of the post-processing. improves.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This invention is characterized by software, and the basic structure of the software is the same as the conventional example shown in FIGS. 5 to 7.

Figure 1 shows the structure of the memory (14) area.
In FIG. 1, (14a) is an area where a control program for controlling the system is stored;
) is a software module added to it for processing tool path data, (14c) is a working area that stores intermediate data for executing the control program,
(14d) is a working area added for processing tool path data, (14e) is a storage area for storing the cutting program, (14f) is a storage area for the tool path of previous machining, and (14g) is for each tool number. This is a storage area for storing tool data such as the tool diameter.

Fig. 2 is a flowchart showing the processing added when analyzing the Cannibal program in order from the beginning and outputting movement data to the servo side. 2-2 is a format conversion routine, step 2-3 is a trajectory save, and step 2-4 is an output. That is, this is a process in which the tool trajectory, which is intermediate data determined by analysis of the cutting program, is stored in the storage area (14f) of the memory (14) shown in FIG. 1, along with the tool diameter at that time.

Figure 3 shows the format conversion routine (2-2) in Figure 2.
This is a process added to step 3-1) in which it is determined whether or not the saved pre-processing and the locus of the block currently being processed interfere. If it is determined that they interfere, the machining plane Z of the previous process is determined. Set the internal memory as the height of the current workpiece (step 3-2), cutting start point Z 1 machining depth 2
2nd grade is calculated (step 3-3). Also, step 3
-1 If it is determined that there is no interference, check whether the height Zo of the machining plane is given or not in step 3-4.
), and when the height Zo is given, the step 3-
3, and if the height Z is not given, the routine returns as an error (step 3-5).

FIG. 4 shows an example of the processing. (51) is the pre-processing tool (9
In the machining locus a), (10a) is a plane to be pre-machined, and it shows that a drill hole (22) is made in the plane (10a) with a post-machining tool (9b). Drill hole (2
Whether or not -(X, Y) in 2) falls within the range obtained by offsetting the width of the tool diameter from the machining locus (51) can be easily determined by solving a quadratic equation.

If the current machining position interferes with the previous machining path with a tool width, the height of the machining plane will be higher than Z in Fig. 7. ) is the same as the machining height of the previous machining, and this is the machining plane of the current machining, and furthermore, find the cutting start point (Figure 7, 21, point where rapid feed changes to cutting feed) with a clearance for Zo. Can be done.

Further, the point to be reached by the drill (22 in FIG. 7) can be determined using only the hole depth data.

Therefore, when machining a plane that has been previously machined, it is possible to omit program data for the height of the machined surface.

The height of the machined surface is programmed for areas where there is no pre-processing, and an alarm can be set if the height of the machined surface is not specified even though there is no pre-processing due to a programming error.

[Effects of the Invention] As described above, according to the present invention, the cutting start point, which is part of the post-processing data, can be automatically determined for 2.1 Canadian Nibragrams by storing and analyzing the pre-processing trajectory. Since it is configured to add logic, it has the effect of improving the efficiency of creating a program.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing memory allocation of a numerical control device according to an embodiment of the present invention, FIGS. 2 and 3 are flowcharts showing processing added to implement the numerical control device, and FIG. 4 5 is a diagram showing the relationship between processing contents and processing locations of the present invention, FIG. 5 is a configuration diagram showing a conventional numerical control device, and FIG.
The figure is a block diagram showing the outline of the internal configuration of the numerical control device.
FIGS. 7A and 7B are diagrams showing the relationship between conventional machining and programs. In the figure, (2) is a moving table, (3) is a spindle head, (5a) and (5b) are shafts, and (9). (9a) and (9b) are tools. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a numerical control device for a machine tool that controls the movement of a moving table using two axes, one that moves parallel to the main axis and the other that is perpendicular to each other, the tool trajectory of previous machining is memorized and the tool trajectory is referenced. A numerical control device characterized by having logic for automatically determining a cutting start point for post-processing.