JPH04606A - Numerical controller - Google Patents

Abstract

PURPOSE:To decrease the useless time generated in the case of repeating a fixed cycle by providing plural output systems, a fixed cycle allocating means, and a fixed cycle execution control means. CONSTITUTION:A working program 2 contains a rough-cutting fixed cycle command of A and B systems corresponding to the tool of a machine tool 9, and a finish shape designation program. A numerical control circuit 1 is provided with an input circuit 3, a command decoding circuit 4, a finish shape decoding circuit 5, a cutting shape generating circuit 6, a cutting path generating circuit 7, etc. In such a state, each of a fixed cycle of plural times repeated for working a work to a target shape is allocated in order to plural output systems corresponding to plural tools of the machine tool 9, and the fixed cycle is executed successively by each output system. In such a case, by overlapping to a return W1 of the fixed cycle which starts the execution first, the execution T2 of the next fixed cycle is started. In such a way, a useless time when working is not executed at all is decreased as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a numerical control device, and more particularly to a numerical control device that can shorten machining time.

[Prior Art] FIG. 8 is a block diagram showing an example of a conventional numerical control device.

In this numerical control circuit (51), an input circuit (53)
reads the Canadian program (52).

The command decoding circuit (54) decodes commands written in the cannibal program (52), such as rough cutting fixed cycle commands.

The finished shape decoding circuit (55) decodes the finished shape read out by, for example, a rough cutting fixed cycle command, and obtains the finished shape.

The cutting shape creation circuit (56) checks whether the finished shape can be cut or not, and if it can be cut, the finished shape is used as the cut shape, and if it cannot be cut, it creates a modified cut shape that can be cut. .

The cutting path creation circuit (57) creates an actual cutting path from the cutting shape.

The output circuit (58) outputs a control signal to the machine tool (9) to move the tool along the cutting path.

The machine tool (9) is, for example, a lathe.

Note that even if the machine tool (9) has a plurality of tools, only one tool is moved when cutting one shape using the canned cycle function.

Now, as shown in FIG. 9, when the workpiece Q is cut into the finished shape F using the rough cutting fixed cycle, the cutting program (52) becomes, for example, as shown in FIG. 10.

In the Canadian program shown in Figure 10, “Tolol
J specifies one tool, rG71J commands a rough cutting canned cycle, "Pl" commands the block with sequence number N1 to be the start block, and "Q2" commands the block with sequence number N2 to be the end block. It instructs people to do what they do. The block with sequence number N1 is a horizontal portion of finished shape F in FIG. 9, and the block with sequence number N2 is an inclined portion.

Since the finished shape F in FIG. 9 can be cut, it becomes a cut shape as it is.

From this cutting shape, cutting paths for each of a plurality of rough cutting canned cycles as shown in FIG. 11 are created. In the figure, (
Tl, Ul, Vl, Wl) is the first cycle,
T1 is approach, UI and vl are cutting, and Wl is return. T2 leading to Wl is the second cycle approach.

The sixth cycle (T6.U6.W6.V6) is the last cycle. After this last cycle return W6, the tool is retracted through path R.

FIG. 12 shows the timing of executing the plurality of rough cutting canned cycles shown in FIG. 11.

Each roughing canned cycle is executed sequentially, one cycle at a time.

[Problems to be Solved by the Invention] As can be understood from the time chart in FIG. 12, the return Wl is when the tool is not actually cutting.

W2. W3. W4. W5. The time W6 is included as is as the entire cutting time.

That is, in conventional numerical control devices, there is a problem in that wasted time during which no actual machining is performed is included in the machining time.

This wasted time becomes longer as the machining area of the workpiece increases, and if the workpiece is hard, the number of cycles increases to reduce the amount of work per cycle, so it becomes longer and cannot be ignored. Become.

SUMMARY OF THE INVENTION An object of the present invention is to provide a numerical control device that performs control to reduce wasted time that occurs when repeating fixed cycles.

[Means for Solving the Problem] A numerical control device of the present invention has a fixed cycle function, and has a plurality of output systems corresponding to a plurality of tools of a machine tool and a method for processing a workpiece into a target shape. fixed cycle allocating means for sequentially allocating each of a plurality of fixed cycles to the plurality of output systems; and a fixed cycle allocating means for sequentially executing the fixed cycles allocated to each output system and starting the execution first at that time. The present invention is characterized in that it includes fixed cycle execution control means for starting execution of the next fixed cycle overlapping the return of the current fixed cycle.

[Operation] In the numerical control device of the present invention, each of the multiple fixed cycles that are repeated to machine a workpiece into a target shape is sequentially assigned to a plurality of output systems corresponding to a plurality of tools of a machine tool, and each output The system causes canned cycles to be executed sequentially.

At this time, execution of the next fixed cycle is started to overlap with the return of the fixed cycle that has started execution earlier.

Therefore, the wasted time when no machining is performed is reduced as a whole.

[Example] Hereinafter, the present invention will be described in more detail based on the example shown in the drawings. Note that this invention is not limited to this.

FIG. 1 is a block diagram of a numerical control device (1) according to an embodiment of the present invention.

In this numerical control device (1), the input circuit (3) is
This is for reading the Canadian program (2).

Here, when cutting the workpiece Q into the finished shape F using the rough cutting canned cycle as shown in FIG. 9, the cutting program (2) will be as shown in FIGS. It comes to show.

In other words, the machine program (2) is a rough cutting canned cycle command of the A system (Fig. 2 (a)) corresponding to one tool of the machine tool (9), and a rough cutting canned cycle command of the A system corresponding to one tool of the machine tool (9). Corresponding B system rough cutting canned cycle command (Figure 2 (
b)) and finished shape specification program (Figure 2 (C))
Contains. In the A-system program in Fig. 2(a), rTololJ specifies the first tool and “Q7
1. IJ is a rough cutting canned cycle and indicates that there is another system that performs the same operation, and rAlooJ indicates that program number 100 is instructed to perform a finishing shape. In the B-system program in Fig. 2(b), rTO303J specifies the second tool and “G7
1.1'' and rAlooJ are as described above. In the program showing the finished shape of FIG. 2(c), the block with the sequence number N1 is the horizontal portion of the finished shape F of FIG. 9, and the block with the sequence number N2 is the inclined portion.

Returning to FIG. 1, the command decoding circuit (4) decodes the command written in the Canadian program (2), and like the Canadian program shown in FIG. If so, it is interpreted as a rough cutting fixed cycle command by two systems, and this fact is stored in the command storage circuit (10). Further, as shown in the flowchart shown in FIG. 3, the cutting flag (lla) for system A is turned on, and the cutting flag (llb) for system B is turned off.

The finishing shape decoding circuit (5) is a part of the Kani program (2).
This is to decipher the finished shape read out by the block rough cutting canned cycle command.

The cutting shape creation circuit (6) uses the finished shape as a cutting shape when it is machinable, and re-creates a machinable shape when it is not machinable.

The cutting path creation circuit (7) calculates and obtains the cutting path for each rough cutting canned cycle that is repeated multiple times to obtain the cutting shape, but if two systems of rough cutting canned cycles are commanded, If stored in the memory circuit (10), each of the plurality of rough cutting fixed cycles is alternately assigned to two systems, and one cycle for each system is given to the cutting execution means (12a) (12b). That is, as shown in FIG.
.

Vl, Wl) 41A system, the second "j I'ful (T2
゜U2. V2. W2) is transferred to the B system, and the third cycle (
T3. U3. V3. W3) goes to the A system, and the fourth cycle (T4.U4.V4.W4) goes to the B system.

The fifth cycle (T5.U5.V5.W5) is alternately assigned to the A system, and the sixth cycle (T6.U6.V6°W6) is alternately assigned to the B system. In addition, Ra.

Rb is the evacuation route for the tools of the A system and the B system.

The one-cycle cutting execution means (12a) of system A and the one-cycle cutting execution means (12b) of system B each operate as shown in the flowchart shown in FIG.

That is, the A-system 1-cycle cutting execution means (12a)
In step S1, it is checked whether the cutting (lla) flag of system A is on. As described above, since the cutting flag (lla) of the A system is turned on by the command decoding circuit (4), the process proceeds to step S2 and cutting is performed to the passing point. This passing point is the final point of cutting in the rough cutting canned cycle, and is the end point of Vl in the first cycle. By the operation of the one-cycle cutting execution means (12a) of the A system, a control signal is sent from the output circuit (8a) of the A system to the tool corresponding to the A system of the machine tool (9), as shown in FIG. 6a. Then, the tools of the A system advance to the paths Tl, Ul, and Vl.

As a result, the workpiece Q is cut.

On the other hand, the one-cycle cutting execution means (12b) for the B system checks whether the cutting flag (llb) for the B system is on in step S1, or uses the command decoding circuit (4) as described above to perform the cutting for the B system. Since the cutting flag (llb) is turned off, the machine waits until it is turned on. Therefore, from the output circuit (8b) of system B, the machine tool (9
), the control signal for driving the tool corresponding to the B system is not sent, and as shown in FIG. 6a, the workpiece Q is not cut by the B system tool.

When the one-cycle cutting execution means (12a) of the A system cuts to the end point (passing point) of Vl of the first cycle, the cutting flag (lla) of the B system is set in step S3.
Check whether it is off. At this time, since the cutting flag (llb) of the B system is off, the process proceeds to step S4, and the cutting flag (llb) of the B system is turned on.

Then, in step S5, the machine moves to the waiting point, and when it reaches the waiting point, the cutting flag (lla) of the A system is turned on.

The second waiting point is the final point of return in the rough cutting canned cycle, and is the end point of Wl in the first cycle. That is, as shown in FIG. 6b, the tools of the A system proceed along the return Wl.

On the other hand, the 1-cycle cutting execution means (12b) of the B-system waits before checking whether the cutting flag (11b) of the B-system is on or not in step Sl. When the cutting flag (11b) of system B is turned on by the execution means (12a), the process proceeds to step S2, and cutting is performed to the passing point. In other words, the 6th
As shown in figure b, the tools of system B are routed T2. U2. V
Proceed to Step 2 and cut the workpiece Q.

When the B-system tool cuts to the end point (passing point) of v2, the B-system 1-cycle cutting execution means (12b)
In step S3, it is checked whether the cutting flag (lla) of the A system is off. In other words, this means waiting for the tools of system A to move to the waiting point. When the tool of the A system moves to the waiting point and the cutting flag (lla) of the A system is turned off, the process proceeds to step S4, and the cutting flag (lla) of the A system is turned on.

Then, in step S5, the machine moves to the waiting point and turns off the cutting flag (llb) of system B.

The A-system one-cycle cutting execution means (12a) checks whether the A-system cutting flag (lla) is on in step S1. In other words, after the A system tool moves to the waiting point, the system waits until the B system tool finishes cutting to the passing point before entering the next rough cutting canned cycle.

Thereafter, the same operation as above is repeated, and as shown in FIG. 6c, the A-system tools are operated at T3 of the third cycle. Li2
．． The tool of the B system follows the path of W2 in the second cycle while the tool of the B system follows the path of V3.

Similarly, as shown in FIG. 6d, when the tool of the A system moves along the path W3 of the third cycle, the tool of the B system moves along the path T4 of the fourth cycle. Proceed along the route U4°v4.

Similarly, as shown in FIG. 6e, the tools of the A system are used at T5 of the fifth cycle. When proceeding along the route of IJ5, ■5,
The tools of the B system proceed along the path W4 of the fourth cycle.

Similarly, as shown in Fig. 6f, when the tool of the A system advances on the path W5 in the fifth cycle and further on the retreat path Ra, the tool of the B system advances on the path 76 and U6 of the sixth cycle.
．． Proceed along V6, and since this is the last cycle, proceed along route W6 and evacuation route Rb.

FIG. 7 shows the timing of the above operation. As can be understood from the figure, the rough-cut canned cycles assigned to system A and the rough-cut canned cycles assigned to system B are executed alternately and sequentially, but the rough-cut canned cycle that is being executed earlier returns. Execution of the next rough cutting canned cycle starts overlapping with the above. Therefore, the wasted time when no cutting is performed is reduced as a whole, making it possible to shorten the total cutting time.

In the above embodiment, the rough cutting canned cycle command by two systems is rG71. It may be IJ or another command code. Alternatively, the command code may be the same as the conventional command code, and it may be determined from the entire Canadian program (2) that it is a fixed cycle command based on two systems.

In addition, in the above example, after one system completes cutting, the other system starts the canned rough cutting cycle from the approach, but the point is that the cutting order only needs to be correct. Other approaches may be started without waiting for the cutting to be completely completed.

Further, in the above embodiment, there are two systems, but there may be three or more systems depending on the number of tools in the machine tool.

"Effects of the Invention: According to the numerical control device of the present invention, canned cycles are executed sequentially in multiple systems, and at that time, the return of the previously executed canned cycle is overlapped with the return of the next canned cycle. Since the execution starts, the wasted time when no machining is performed is shortened, and the total machining time can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a numerical control device according to an embodiment of the present invention, Fig. 2 (a), (b), and (c) are illustrations of a program format when rough cutting canned cycles are performed using two systems, and Fig. 3 1 is a flowchart of the operation of the command decoding circuit of the numerical control device shown in FIG. 1, and FIG.
A flowchart of the operation of the cycle cutting execution means, FIG. 5 is a conceptual diagram of cutting paths assigned to two systems, and FIGS. 6a to 6f are conceptual diagrams showing the progress of execution of a rough cutting canned cycle by two systems. , Fig. 7 is a timing chart of execution of a rough cutting canned cycle by two systems, Fig. 8 is a block diagram of an example of a conventional numerical control device, Fig. 9 is an illustration of a finished shape, and Fig. 10 is a conventional numerical control diagram. An example diagram of a program format when performing a roughing canned cycle using a control device, FIG. 11 is a conceptual diagram of a cutting path using a conventional numerical control device, and FIG. 12 is a timing chart for executing a roughing canned cycle using a conventional numerical control device. It is. In the figure, (1) (51) is a numerical control device, (2) (
52) is a Canadian program, (3) and (53) are input circuits,
(4) (54) are command decoding circuits, (5) (55) finished shape decoding circuits, (6) and (56) are cutting shape creation circuits, (7
(57) is the cutting path creation circuit, (8a) is the A system output circuit, (8b) is the B system output circuit, (9) is the machine tool, (10) is the command storage circuit, (lla) is the A system The cutting flag of the system, (1l b) is the cutting flag of the B system, (
12a) is an A-system one-cycle cutting execution means; (12b)
) is the one-cycle cutting execution means of the B system. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Figure 2 (b) Flowgram of system B (C) Program number +00 (a) Flowgram of system A

Claims (1)

[Claims] 1. A numerical control device having a fixed cycle function, which includes a plurality of output systems corresponding to a plurality of tools of a machine tool, and a plurality of fixed cycles that are repeated to machine a workpiece into a target shape. Fixed cycle allocating means for sequentially allocating each of the fixed cycles to the plurality of output systems, and causing the fixed cycles assigned to each output system to be executed sequentially, and returning and duplicating the fixed cycle that has started execution first at that time. fixed cycle execution control means for starting execution of the next fixed cycle.