JPH01158507A - Function generating system in numerical controller - Google Patents

Abstract

PURPOSE:To decrease the burden applied to the CPU of an NC device by using a previous unit moving quantity and executing the interpolation without calculating a new unit moving quantity when the interpolation commanded on a working program is executed and a feeding overriding value is not changed. CONSTITUTION:A reference unit moving quantity calculating part 3 calculates a reference unit moving quantity DELTAXs and a feeding overriding vale reading part 5 reads a present feeding overriding value Fr from a feeding overriding switch 4 of a console panel. Next, a comparing part 12 confirms whether or not the overriding value Fr is coincident to a previous feeding overriding value Fb, and at the time of the dissidence, a unit moving quantity calculating part 15 calculates a present interpolation unit moving quantity DELTAX by the reference unit moving quantity DELTAXs and the overriding value Fr. At the time of the coincidence, a previous unit moving quantity DELTAXb is made into the present unit moving quantity DELTAX, a position calculating part 16 adds the present unit moving quantity DELTAX to a previous position X and the position X by the present interpolation is obtained. Thus, the burden applied to the CPU of the NC device can be decreased.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method for performing linear interpolation, 3-circular interpolation, etc. commanded on a machining program at a commanded feed rate, at a fixed interpolation period. Numerical control (hereinafter referred to as NC) calculates the unit rotation amount and performs interpolation until the target position of the interpolation command is reached.
(2013) relates to a function generation method in a device.

(Prior Art) FIG. 6 is a block diagram showing an example of an NC device that implements a conventional function generation method, and includes a machining program decoding section 2 that reads and decodes a machining program 1, and a machining program decoding section 2 that reads and decodes a machining program 1. Interpolation command and feed speed SS from 2
A reference unit movement amount calculation unit 3 that calculates the amount to be moved (hereinafter referred to as reference unit movement amount) Δ×s for each interpolation cycle according to the following.
It has Furthermore, a feed override value reading section 5 reads the feed override value Fr from the feed override switch 4 every interpolation period, and a feed override value F from the feed override value reading section 5 and a feed override value F from the reference unit movement amount calculation section 3 are provided. A unit movement amount calculation section 6 that calculates a unit movement amount Δx for each interpolation period from a reference unit movement amount Δx5, and a unit movement amount Δ from this unit movement amount calculation section 6.
The position calculation section 7 calculates the current interpolated position X from X and outputs it to the servo control section.

In such a configuration, the operation will be explained using the flowchart in FIG. 7. When an interpolation command is issued on the machining program 1, the reference unit movement is performed every interpolation cycle according to the interpolation command on the machining program 1 and the feed speed SS. Amount ΔX
The reference unit movement amount calculation unit 3 calculates s (step Sl
). This reference unit movement amount ΔXS is the unit movement amount when the feed override value is 100 mm. Next, the feed override value reading unit 5 reads the current feed override value F.
, is read from the feed override switch 4 on the operation panel (step 52). Then, the reference unit movement amount ΔX calculated by the reference unit rotation amount calculation unit 3 and the feed override value F read by the feed override value reading unit 5
, the unit movement amount calculation unit 6 calculates the unit movement amount ΔX for the current interpolation (step S3). For example, when the feed override value F read by the feed override value reading section 5 is 909 g, the unit movement amount ΔX is expressed by the following equation (1).

ΔX=Δx3X90/100 (1)
Then, the position calculation unit 7 adds this unit movement amount Δx to the previous position X to calculate the current interpolated position X (step S4). Then, check whether the position X has reached the target position x of the interpolation command (step S5), and if the current position X has not reached the target position
After the next supplementary opening period, the processes of steps S2 to S5 are repeated. On the other hand, in the judgment step S5, if the current position X reaches the target position X□ of the interpolation command,
The processes of steps 51 to S5 are performed for the new interpolation command.

(Problem to be Solved by the Invention) In the function generation method in the NC device described above, the unit movement amount is calculated for each interpolation period (reference unit movement amount x feed override value) even when the feed override value does not change.
This puts a heavy burden on the CPU of the NC device.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide an NC device that can reduce the burden placed on the CPU of the NC device when performing interpolation commanded on a machining program. The objective is to provide a function generation method.

(Means for Solving the Problem) The present invention calculates a unit movement amount for each fixed interpolation period according to an interpolation command such as linear interpolation, three-circular interpolation, etc. and a feed rate command on a machining program, and This invention relates to a function generation method in an NC device that performs interpolation until a target position is reached. The current interpolation is performed after storing the movement amount, and in the next interpolation, the feed override value used in the next interpolation is compared with the stored feed override value for the load for which the unit movement amount is calculated. If the comparison results match, the next interpolation is performed using the stored unit movement amount, and if they do not match, the feed override used in the next interpolation is performed. This is achieved by storing the value and the next unit movement amount calculated based on the feed override value, and then performing the next interpolation every interpolation cycle.

(Function) In the function generation method in the NC device of the present invention, if the feed override value does not change when performing interpolation commanded on the machining program, the previous unit movement amount is not calculated without calculating a new unit movement amount. By performing interpolation using the amount of movement, the load placed on the NG wave device CPU is reduced.

(Example) FIG. 1 is a block diagram showing an example of an NG wave device that implements the function generation method of the present invention, corresponding to FIG. . This NG wave device, the feed override value F from the feed override value reading section 5, and the feed override value storage memory 1
1, and if the comparison results do not match, the feed override value Fb from the feed override value reading section 5 is compared.
, is stored in the feed override value storage memory 11, and is output to the unit movement amount calculation section 15. At the same time, a feed override mismatch signal SU is output to the unit movement amount calculation switching section 13, and if the above comparison results match. In this case, the comparison unit 12 outputs the feed override coincidence signal SC to the unit movement amount calculation switching unit 13. Furthermore, in response to the feed override mismatch signal SU from the comparing section 12, a new unit movement amount calculation command SN is output to the unit movement amount calculating section 15, and in response to the feed override coincidence signal SC from the comparing section 12, the unit movement amount calculation command SN is output to the unit movement amount calculation section 15. Volume storage memory 14
A command S× to output the previous unit movement amount ΔXb stored in the position calculation unit 16 as the current unit movement amount ΔX.
It has a unit movement amount calculation switching section 13 that outputs the unit movement amount calculation switching section 13 to the unit movement amount storage memory 14. Then, in response to the unit movement calculation command SN from the unit movement amount calculation switching unit 13, the comparison unit 1
The unit movement amount Δ is calculated from the feed override value F from 2 and the reference unit movement amount Δ×5 from the reference unit movement amount calculation unit 3.
A unit movement amount calculation unit 15 that calculates × and outputs it to the position calculation unit 16 and stores it in the unit movement amount storage memory 14.
and the unit movement amount ΔX(
A position calculation section 16 is newly provided which calculates the position X by the current interpolation from the unit movement amount .DELTA.X of .DELTA.

In such a configuration, the operation will be explained using the flowchart in Fig. 2. When an interpolation command is issued on the machining program 1, the reference unit movement is performed every interpolation cycle according to the interpolation command on the machining program 1 and the feed speed SS. Amount ΔX
The reference unit movement amount calculation unit 3 calculates S (step 51
1). Next, the feed override value reading section 5 reads the current feed override value F from the feed override switch 4 on the operation panel (step 512). At this point, the comparator 12 checks whether or not this feed override value Fr matches the previous feed override value Fb (step 513).
.

F do not match, the reference unit movement amount ΔXs calculated by the reference unit movement amount calculation section 3 and the feed override value F read by the feed override value reading section 5
, the unit movement amount calculation unit 15 calculates the unit movement amount ΔX for the current interpolation (step 514), and also calculates the feed override value Fr and the unit movement amount ΔX in the feed override value storage memory 11 and the unit 6''). jJ
Store the previous values Fb and ΔXb in the quantity storage memory 14 -c s
Myself (stay/'7'S15,518). - On the other hand, in the judgment step 513, if each feed override 1 to value Fr and Fb match, the previous unit movement amount Δ×b is set as the current unit movement amount Δ× (step 5
17). Then, the position calculation unit 16 adds the current unit movement amount ΔX to the previous position X to obtain the current interpolated position X (step 5ta). Then, check whether the position X has reached the target value 1xa of the interpolation command (Step 519). If the current position Steps S12-5
The process of step 19 is repeated. On the other hand, the judgment step S1
In step 9, if the current position X reaches the target position
9 processing is performed.

Here, the operation of the present invention described above and the conventional operation will be compared and explained using time charts shown in FIGS. 3 to 5. FIG. 3 is a time chart of the instantaneous NG wave device function generation, and the function generation process is performed every fixed interpolation period.
During this free time, processing such as decoding of machining programs is performed. FIG. 4 shows the function generation process in one interpolation period of the present invention, of which 512, 5
13,517°518,519 is a division corresponding to the processing of 513,517°518,519 in the flowchart of FIG. Further, FIG. 5 shows the conventional function generation processing in one interpolation period, in which S2, S3, . S4. S5 is step 52 in the flowchart of FIG. S3. It is divided into sections corresponding to the processes of S4 and S5. Compared to the conventional operation, the operation of the present invention does not require the process of S3, that is, the process of calculating the unit movement amount ΔX from the reference unit movement amount ΔX5 and the feed override value Fr, so the function generation processing time is extremely shortened. ing.

(Effects of the Invention) As described above, according to the function generation method in the NC device of the present invention, the unit movement amount is calculated only when the feed override value changes. The load on the CPU is reduced. Therefore, the interpolation period may be shortened by that amount, or the CPU
It is possible to allocate the processing to decoding the machining program, which can lead to higher performance of the NC device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of an NC device that implements the function generation method of the present invention, FIG. 2 is a flowchart explaining its operation, and FIG. 3 is a time chart of function generation of a general NC device. FIG. 4 is a time chart of function generation according to the present invention, FIG. 5 is a time chart of conventional function generation,
FIG. 6 is a block diagram showing an example of an NC device that implements the conventional function generation method, and FIG. 7 is a flowchart illustrating its operation. 1... Machining program, 2... Machining program decoding section, 3... Reference unit movement calculating section, 4... Feed override switch, 5... Feed override value reading section, 11... Feed Override value storage memory, I2...Comparison unit, 13...Unit movement amount calculation unit conversion unit, 14...Unit movement amount storage memory, 15...Unit movement amount calculation unit, 16...Position calculation Department. millet? Nagiyu Mltl 3rd Hina 4th Nagi 5th Nagi

Claims (1)

[Claims] A function in a numerical control device that calculates a unit movement amount every fixed interpolation cycle according to interpolation commands such as linear interpolation, circular interpolation, etc. and feed rate commands on a machining program, and performs interpolation until the target position of the interpolation command is reached. In the generation method, the feed override value used in this interpolation,
The current unit movement amount calculated based on this feed override value is memorized before the current interpolation is performed, and in the next interpolation, before calculating the unit movement amount, the feed override value to be used in the next interpolation is , and the stored feed override value, and if the comparison results match, perform the next interpolation using the stored unit movement amount, and if they do not match, perform the next interpolation. The feed override value to be used in the next interpolation and the next unit movement amount calculated based on this feed override value are stored, and then the next interpolation is performed every interpolation cycle. A function generation method in a numerical control device characterized by the following.