JPH0481904A - Numerical controller - Google Patents

Abstract

PURPOSE:To execute the working at a high speed, while reducing the memory capacity of a moving amount storage memory to held by executing the reciprocation working by using moving data of every minute unit time obtained by analyzing and operating one working program in the reciprocation working. CONSTITUTION:In a moving amount storage memory 9, a moving data group of every minute unit time which can be processed at a high speed, processed at the time of going-working which extends from P2 to P3 in the figure is stored. Accordingly, reciprocation working after the return direction working which extends from P4 to P5 in the figure comes to utilize a moving data group of its memory 9. In such a way, in the case of executing the reciprocation working, etc., of an object to be worked, working can be executed at a high speed, while reducing the capacity of the moving amount storage memory for storing moving data of every minute unit time which can be processed at a high speed to half.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a numerical control device (hereinafter referred to as an NC device), and particularly relates to control of reciprocating machining and the like.

[Prior Art] As a conventional NC device used for controlling reciprocating machining, there is, for example, an NC device described in Japanese Patent Application Laid-Open No. 64-23305.

This NC device allows one subprogram to be read in both forward and reverse directions.
The size of the machining program is halved compared to the conventional one, so the time required to create the machining program is halved and the capacity of the machining program is also halved.

Also, as an NC device for controlling machine tools at high speed,
For example, there is an NC device described in Japanese Unexamined Patent Publication No. 57-201904.

This NC device converts a group of operation command blocks inputted to the NC device into a group of movement data that can be processed at high speed, which is the final operation result, in advance and stores it in a memory, and then sequentially reads out the group of movement data. The machine tool can be controlled at high speed by outputting the following information.

[Problem to be solved by the invention]

In the conventional NC device disclosed in Japanese Patent Application Laid-open No. 64-23305, subprograms must be read out block by block from the opposite direction during the return pass of reciprocating machining. It is necessary to analyze and calculate the movement data for the return trip, which takes time as well as for the outward trip, which poses the problem of being unsuitable for high-speed machining. Also, a linear interpolation command (GO1O1 command, circular interpolation command (G
02, GO3 commands), it was necessary to recalculate the end point and arc center position of these commands, further increasing processing time.

Moreover, the NC shown in the conventional Japanese Patent Application Laid-Open No. 57-201904
Unlike the invention disclosed in JP-A No. 64-23305, the device does not take into account the reduction of the machining program size for reciprocating machining, so it is not suitable for machining thighs that are capable of high-speed machining, and for machining the return path of reciprocating machining. The machining program must be created in advance, so the size of the machining program is 2.
Therefore, the time required to create a machining program is doubled, and in order to perform high-speed machining, it is necessary to also store the movement data group for return machining in the memory that stores the movement data group that can be processed at high speed. There was a problem that the capacity of the machine was doubled.This invention was made to solve this problem.It increases the memory capacity to store a group of moving data that can be processed at high speed in reciprocating machining, etc. (The purpose is to obtain an NC device capable of high-speed machining.

[Means for Solving the Problems] A numerical control device according to the present invention includes a movement amount storage memory,
a movement amount storage means for storing, in the movement amount storage memory, a group of movement data for each minute unit time obtained by analyzing and calculating a predetermined machining program with the codes of the blocks of the machining program unchanged and in block order; Reverse reading means for reading out the movement data group from the quantity storage memory in a direction opposite to the block forward direction of the machining program, and reverse reading means for reversing the sign of the movement data group read by the reverse reading means and outputting it to the output section. The configuration includes a converting means.

Further, the numerical control device according to another aspect of the present invention stores a movement amount storage memory and a movement data group for each minute unit time obtained by analyzing and calculating a predetermined machining program in the movement amount storage memory. A movement amount storage means that stores the blocks in block order with the sign reversed, and a reverse readout that reads the movement data group from the movement amount storage memory in a direction opposite to the block forward direction of the machining program and outputs it to the output section. The configuration includes a means.

[Effect]

For example, in the case of reciprocating machining, the numerical control device according to the present invention performs reciprocating machining using movement data for each minute unit time obtained by analyzing and calculating one of the machining programs of the reciprocating machining.

[Embodiments of the invention] An embodiment of this invention will be described below.

FIG. 1 shows the main program (17) of an embodiment of this invention.
) and the subprogram (18). Figure 2 is an explanatory diagram showing the machining trajectory during reciprocating machining, and Figure 3 is an explanatory diagram showing the relationship between the subprogram (18).
The figure shows the configuration of an NC thresholder according to an embodiment of the present invention.
Fig. 4 is a flowchart showing the operation, Fig. 5 is a flowchart showing details of the backward reading block in Fig. 4, and Fig. 6 is a flowchart showing the details of the block of backward reading in Fig. 4. It is an explanatory diagram.

In FIG. 3, (1) is an NC device 5 that performs machining control by decoding the machining program and controlling the relative position of the workpiece and tool, and (2) is a display device (2) that displays various numerical control information. CRT) and an operation board for inputting various setting information, (3) is a machining program memory which is a machining program storage medium, (4) is a machining program memory (3)
machining program input means for reading a machining program from and outputting the machining program to the travel amount storage means (11) or the travel amount calculation means (21); (5) is a machine tool; (6)
is a tool attached to the machine tool (5), (7) is a servo motor that moves the machine tool (5), and (8) is a drive that uses various interpolated information as input to drive the servo motor (7). The servo controller is an output unit that generates a signal, (9) is a movement amount storage memory, (lO) is a movement number register in the movement amount storage memory (9), and (11) is output from the machining program input means (4). A movement in which each program block that controls the relative position of the tool and workpiece is interpolated into movement data for each minute unit time and stored in the movement amount storage memory (9). The amount storage means (12) is the movement amount storage means (
11) counts the number of times stored in the movement amount storage memory (9) and writes it to the movement number register (lO); (13) moves the movement data stored in the movement amount storage memory (9); Movement amount reading means (14) outputs the movement amount to the servo controller (8) until it reaches the number of times in the movement amount register, and (14) is a movement number that updates the contents of the movement number register (10) when the movement amount is output from the movement amount storage memory (9). Subtraction means (15) is a movement amount readout means for reading movement data for each minute unit time from the movement amount storage memory (9) in the reverse direction from the last stored one, and (16) is a movement amount readout means for reading out the sign of the movement data. Flip it over and attach the servo controller (
(19) is a main program/sub program discrimination means for determining whether to execute the main program (17) or sub program (18); (20) is a forward machining ( P2 in Figure 2
In addition to determining in which direction machining is to be performed (machining from P4 to P3 in Fig. 2) or return machining (machining from P4 to P5 in Fig. 2), it is determined whether the process is the first machining or the second and subsequent machining in the case of forward machining. The forward machining/return machining discrimination means determines whether it is machining, and in the case of the first forward machining, the movement amount storage means (11) and the movement amount reading means (13) are executed, and the movement amount storage means (11) and the movement amount reading means (13) are executed in the case of the first outward machining. In this case, only the movement amount reading means (13) is executed, and in the case of backward machining, the movement amount reading means (15) is executed. or(
21) is the movement amount calculation means of the main program, (22)
is a movement count reset means that returns the contents of the movement count register (lO) to the original value when it becomes "0".

This NC device basically executes the main program as shown in Fig. 4 (Sl), and the command code instructed in this main program is rM98.
If the command code is rM98.2J, the subprogram is executed in the forward direction (S4), and if the command code is M2R, 3J, the subprogram is executed in the reverse direction. (S5), and when the main program ends, its execution is terminated (S5).
SL).

Next, the detailed operation of this NC device will be explained using a specific example.

In this operation description, a case will be described in which a machining program as shown in FIG. 1 is executed in order to perform reciprocating machining as shown in FIG. 2.

Also, in the main program (17) in Figure 1, rNlOG
OIX -3, F2O3; J Ha Figure 2! l;&t6
P11! l) Move the tool (6) 500mm from position P2.
Command block for positioning at a feed rate of /min, rNlIM9g, 2P tooo; J is 01000
Command block for executing the forward machining subprogram (18) in the forward direction and performing the forward machining from P2 to P3 in FIG. 2, rN12GOIX-3; J
C Fig. 2 4m g Ke6 Tool (from P3 to P4 position)
6) Command block for positioning r N 1
3M98.3P 1000; J is a command block for executing the outgoing machining subprogram (18) of 01000 in the reverse direction and performing the backward machining from P4 to P5 in FIG.

First, such a main program (17) and subprogram (18) are stored in the machining program memory (3), and when machining is started, the machining program input means (4) inputs the main program in the machining program memory (3). Load program (17). Main program (17)
is read, the main program/subprogram determining means (19) determines that the main program (17) is to be executed and causes the movement amount calculation means (21) to execute, and the movement amount calculation means (21) executes the main program (17). ), for example, rNloGOIX-3, F2O3, J (7) blocks are processed and the processing results are passed to the servo controller (8) to control the servo motor (7). For example rN
lOGolx-3,Fsoo;'', the positioning from PL to P2 in Fig. 2 is 5.
It is carried out at a feed rate of 00 mm/min.

Main program (17) (7) rNIOGOIX
-3°F2O3; When the process of J is completed, then r N
11M98.2P 1000; Read block J. Loading this block will cause the main program/
The subprogram determining means (19) determines whether the subprogram (1
8) is executed, the forward machining/return machining discrimination means (2) is executed.
0) is executed. At this time, the determining means (20) determines that this is the first outward machining, and causes the movement amount storing means (11) to execute. The movement amount storage means (11) reads the subprogram (18) block by block from the top to the bottom of the diagram, and stores each block as a group of movement data that can be processed at high speed, which is the final calculation result, that is, a micro unit time ( The subprogram (18
) and the same code as the code of each block of the subprogram (18) is stored in the movement amount storage memory (9). At this time, the movement number adding means (12) counts the number of storage times and writes it into the movement number register (lO).

By the way, the minute unit time (△T) of this NC device is 10m5
In the case of rY-2-5 in subprogram (18);
The block data of , as shown in FIG. Since -2, 5, and J are divided into 30, the number of storage times "30" is written in the movement number register (lO). In this movement data group, the difference in numerical values is the fraction for moving the Y-axis by -2.5mm! l! This is to adjust the situation.

At the end of the subprogram (18), the code rM99J is commanded, and the machining program input means, step (4)
) reads this block, the movement amount storage means (11
) finishes storing the movement data group, and at the same time, the movement amount reading means (13) reads out the movement data group from the movement amount storage memory (9) in the block order described in the subprogram (18), and the servo controller (8> The processing from P2 to P3 in Fig. 2 is executed by outputting the output to .At this time, the number of movements subtracting means (14) updates the number of movements register (10).

When the number of movements register (lO) becomes "0", the number of movements reset means (22) returns the contents of the number of movements register (lO) to the original value again, and the main program (17
), the machining program input means (4) returns to the main program (17) (7) rN12GOIX-3,
4 and performs the same processing as described above to execute positioning from P3 to P4 in FIG.

Next, when the block r N 13M98.3P 100G, J is read, the forward machining/return machining discrimination means (20) determines that it is the backward machining, and the movement amount reading means (
15).

The movement amount reading means (I5) reads the movement amount storage memory (9).
) is read out from the movement data group in the direction opposite to the block order of the subprogram (18), and movement amount inverse conversion means (16
) inverts the sign of the movement data and outputs it to the servo controller (8), thereby executing the return machining from P4 to P5 in FIG.

The details of this backward machining process will be explained with reference to the flowchart in FIG. 5 and the explanatory diagram of the movement data group stored in the movement amount storage memory (9) in FIG.

That is, in order to execute the subprogram (18) in the reverse direction, the movement amount reading means (15) searches for movement data of the last block stored in the movement amount storage memory (9) (S51).

Movement data is read from that position (S52). Here, movement data corresponding to the movement amount "-84μ" per micro unit time of the Y-axis movement amount r-2, 5J is read.

At that time, the movement number subtraction means (14) updates the contents of the movement number register (lO) (S53).

The movement amount inverse conversion means (16) converts the sign of the movement data of each coordinate (554). In the example of FIG. 6, the sign of the Y-axis movement data is "-" and is converted to "+".

The code-converted movement data is sent to the servo controller (9)
[555]

Next, the previous movement data is searched (S57), and the same reverse readout/inverse conversion process as above is repeated (352~
555). Then, move count register (
When lO) becomes 0 [556], the movement count reset means (22) returns it to the original value again (SSa), searches for the movement data of the next block, and repeats the same process as described above. Return machining from P4 to P5 in FIG. 2 is executed.

When the execution of this subprogram (18) is completed, the process returns to the main program (17), and the machining program input means (4) again reads rN14GOIX-3,;J in the main program (17) and performs the above-mentioned processing. The same process as above is performed to execute positioning from P5 to P6 in FIG.

Next, when the block r N 15M 98.2P 1000 ; Execute. The movement amount reading means (13) has a movement amount storage memory (9) that already has minute unit time (ΔT) which can be processed at high speed.
Since the movement data group for each movement is stored, the memory (
The servo controller (8) reads the movement data group from 9) in the block order described in the subprogram (18).
The processing from P6 to P7 in FIG. 2 is executed. These processes are performed by the main program (17
) is repeated until it is completed.

That is, in this embodiment, the movement amount storage memory (9) stores a group of movement data for each small unit time (6 teeth) that can be processed at high speed and that was processed during the outward machining from P2 to P3 in FIG. Since it is stored, P4 to P in Figure 2
The reciprocating machining after the return direction machining to 5 is stored in its memory (9
) is used. Therefore, when performing reciprocating machining, high-speed machining is possible while reducing the memory capacity of the memory (9) by half.

Note that in the above embodiment, the sign is inverted after backward reading, but if the sign is inverted when storing the movement data group in the movement amount storage memory (9), the backward reading can be performed during backward machining. The same effect as in the above embodiment can be obtained.

Of course, in this case, it is necessary to perform code conversion after reading by the movement amount reading means (13) during forward machining.

Further, in the above embodiment, a movement data group for each minute unit time (6 teeth) calculated during the first outgoing machining and which can be processed at high speed is stored in the movement amount storage memory (9). If arithmetic processing is performed and the movement data group is stored in the memory (9), even higher speed machining becomes possible.

Furthermore, in the above embodiment, the reciprocating machining after the return machining from P4 to P5 in FIG. Even if the movement data group is converted into a movement data group for every possible minute unit time (ΔT) and stored in the memory (9), and the movement data group is used only during return machining, the intended purpose cannot be achieved. Needless to say.

Furthermore, in the above embodiment, the case where the present invention is applied to reciprocating machining has been described, but the present invention can be applied not only to reciprocating machining but also to machining of bilaterally symmetrical shapes.

[Effect of the Invention J As described above, according to the present invention, when reciprocating a workpiece, etc., high-speed machining can be achieved while halving the memory capacity for storing movement data for each minute unit time that can be processed at high speed. You can get the effect that you can.

[Brief explanation of drawings]

The figure is a diagram according to an embodiment of the present invention, and FIG. 1 is an explanatory diagram showing the relationship between the main program and subprograms.
2nd rI! J is an explanatory diagram showing the machining trajectory during reciprocating machining,
FIG. 3 is a diagram showing the configuration of the NG device, FIG. 4 is a flowchart showing its operation, FIG. 5 is a flowchart showing details of the reverse read block in FIG. 4, and FIG.
The figure is an explanatory diagram of movement data stored in a movement amount storage memory. In the figure, (1) is an NC device, (2) is an operation board,
(3) is a machining program memory, (4) is a machining program input means, (5) is a machine tool, (6) is a tool, (7)
is a servo motor, (8) is a servo controller, (9)
is the movement amount storage memory, (lO) is the movement number register, (
11) is a movement amount storage means, (12) is a movement number addition means, (13) is a movement amount reading means, (14) is a movement number subtraction means, (15) is a movement amount reading means, (1
6) is the movement amount inverse conversion means, (17) is the main program, (18) is the subprogram, (19) is the main program/subprogram discrimination means, and (20) is the forward machining/
Return path machining determination means, (21) is movement amount calculation means, (2
2) is a movement number reset means. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Main program 18゛thefireΩ7“ram

Claims (2)

[Claims] (1) A movement amount storage memory and this movement amount storage memory,
a movement amount storage means for storing a movement data group for each minute unit time obtained by analyzing and calculating a predetermined machining program with the block codes of the machining program unchanged and in block order; and a movement data group from the movement amount storage memory. A reverse reading means for reading out the data in a direction opposite to the forward direction of the block of the machining program, and an inverse conversion means for inverting the sign of the movement data group read by the reverse reading means and outputting it to the output section. Numerical control device. (2) A movement amount storage memory and this movement amount storage memory,
a movement amount storage means for storing a group of movement data for each minute unit time obtained by analyzing and calculating a predetermined machining program with the signs of the blocks of the machining program inverted and in block order; and a movement amount storage means for storing movement data from the movement amount storage memory. A numerical control device comprising reverse reading means for reading a group in a direction opposite to the block forward direction of a machining program and outputting it to an output section.