JPH0760329B2 - Numerical control device - Google Patents

Description

The present invention relates to a numerical controller having a simultaneous interpolation control function for two or more simultaneous axes. The present invention relates to a numerical control device that performs interrupt control by a set amount.

[Conventional technology]

FIG. 4 is a block diagram showing a schematic configuration of a conventional numerical control device used in a machine tool. In the figure, 1 is a paper tape serving as a machining program medium, 2 is an input unit for reading the machining program, and 3 is a machining program. Based on the above, a calculation unit for analyzing the movement locus of the machine, speed control, etc., 4 is an interpolation circuit unit for correctly controlling each axis according to the movement locus calculation result, and 5 is output from the interpolation circuit unit 4. The drive unit 6 controls the rotation of the motor and the like based on the pulse distribution data generated, and 6 is a machine tool driven by the motor.

Next, the operation will be described. In the above configuration, it is necessary to create a processing program in advance and perform processing as the paper tape 1. In the case of the processing shown in Fig. 5, N1, N
It is necessary to create a machining program consisting of 3 command blocks of 2 and N3, but since the X axis, U axis, Z axis and C axis are all axis interpolation, the position and speed in each command block are continuous. The calculation to move to becomes complicated. For example, considering the Z axis as a reference, while the Z axis moves up to z ₃ , the C axis up to c ₃ and the U axis up to u ₃
x _1, x _2, x ₃ and for a polyline not linear, commanded by the command block of N1 to _{x 1, u 1, z 1} , c 1, by a command block of N2
_{x 2, u 2, z 2} , c 2 until commanded, N3 x ₃ by a command block,
It is necessary to command up to u ₃ , z ₃ , and c ₃ . In addition, it is necessary to move the Z axis, C axis, and U axis at a constant speed between each command block, and in this case, calculation of speed specification in each command block of N1, N2, N3 becomes quite complicated. . When there is a change in speed between each command block of N1, N2, N3, the cutter mark remains on the work piece, and even if it does not cause a problem in terms of accuracy, there is a problem in appearance.

[Problems to be solved by the invention]

Since the conventional numerical control device is configured as described above, all the commanded axes are only interpolation control, and even when only one axis is retracted from the middle, all commands must be commanded as a machining program. It was necessary to perform a complicated speed calculation and give it to the machining program as the cutting feed rate. In addition, when changing the retracted position due to the shape of the work, the shape of the cutter, etc., the trajectory and speed had to be recalculated from the beginning, and the machining program had to be recreated.

The present invention has been made to solve the above problems, and can simplify a machining program, and can easily set position information and speed information to escape from the middle of interpolation, and Above all, it is an object of the invention to obtain a numerical control device capable of issuing a command in advance in a parameter setting format before a cutting command.

[Means for solving problems]

In the numerical controller according to the present invention, the interrupt data storage unit processes the interrupt position, the interrupt speed, the interrupt distance, etc. during the interpolation in parallel with the interpolation control, and the interrupt control unit constantly monitors the interpolation position. When the interpolation position reaches the interruption position, the interruption pulse is superimposed on the interpolation circuit data by the interruption distance according to the interruption speed given from the interruption data storage unit and is given to the drive unit.

[Action]

Since the numerical control device according to the present invention is provided with the interrupt data storage unit and the interrupt control unit, the process for escape can be performed completely separate from the cutting command of the machining program, and the escape locus can be created when creating the machining program. It is possible to create a cutting program with an ideal (without interruption) trajectory without considering

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a numerical controller according to the present invention. In the figure, 1 to 6 are the same or corresponding portions as those in FIG. 4 described above, and 7 is an interpolation circuit section 4 and a driving section. 5
And an interruption control unit for providing the driving unit 5 with an interruption signal on the position information as the interpolation data, which is the output of the interpolation circuit unit 4, and 9 is a visual display setting unit (for example, a cathode ray tube setting unit). , 8 are interrupt data storage units that give an interrupt signal to the interrupt control unit 7 by using a command input from the input unit 2 or the visual display setting unit 9 or a setting input from the visual display setting unit 9 as an input signal.

In the processing program recorded on the paper tape 1, X
For the command positions given to the axes, U-axis, Z-axis and C-axis, it is sufficient to give only the machining end point. That is, the X axis is x ₃ , the U axis is u ₃ , the Z axis is z ₃ , and the C axis is c ₃ . In other words, without considering the interrupt position at all,
The following normal processing program format may be used.

Gol Xx ₃ Uu ₃ Zz ₃ Cc ₃ Ff ₁ ; Interpolation speed is all f ₃ and there is no complexity. However, the interrupt control unit 7 is additionally provided with control for interrupting the distance of only xi at the speed of fi when the remaining Z axis is xi.

FIG. 2 is a chart diagram of axis control interpolation processing in an embodiment of the present invention.

FIG. 3 is a block diagram showing a specific configuration of only one axis for the interpolation circuit unit 4, the interrupt control unit 7, and the interrupt data storage unit 8. In the figure, 40 is an X-axis speed command, 41 is X
Axis movement data, 42 is execution command signal, 43 is X-axis remaining distance register, 44 is X-axis coordinate position, 4A and 4B are gates, 4C is comparator, 4D, 4E and 4F are gates. Make up 4. Reference numeral 7A is a comparator, and 7B and 7C are gates, which constitute the interrupt control unit 7. 80 is the X-axis interrupt coordinate position, 81 is the X-axis interrupt speed data, 82 is the X-axis interrupt set amount, 83 is the X-axis interrupt amount register, 8A and 8B are gates, 8C is a comparator, 8D, 8E and 8F are gates. Then, these constitute the interrupt data storage unit 8.

Next, the operation of each of these units will be described.

The X-axis speed command 40 and the X-axis movement data 41 as the interpolation circuit unit data output from the interpolation circuit unit 4 are sent to the X-axis remaining distance register 43 through the gate 4A by the execution command signal 42. The X-axis speed command 40 and the X-axis remaining distance signal from the X-axis remaining distance register 43 are selected by the comparator 4C as the actual X-axis command pulse at the gate 4D or 4E, and in any case, output through the gate 4F. To be done. The output X-axis command pulse is subtracted from the X-axis remaining distance register 43 through the gate 4B. This is repeated sequentially, and the X-axis command pulse is sent through the gate 4F until the X-axis remaining distance register 43 becomes 0. During this X-axis interpolation control, the X-axis data is always accumulated and accumulated, the X-axis coordinate position 44 is updated, and the comparator 7A determines the X-axis data.
The data of the axis coordinate position 44 and the X-axis interrupt coordinate position 80 are compared in size, and the X-axis interrupt coordinate position 80 becomes the X-axis coordinate position 44.
When it gets smaller, it opens gate 7B and passes an interrupt pulse. X-axis interrupt speed data 81 and X-axis interrupt set amount 82
Has been set in advance by the machining program or the visual display setting unit 9, and X is determined by the comparator 7A through the gate 8A.
It is sent to the axis interrupt amount register 83. The X-axis interrupt speed data 81 and the X-axis interrupt amount signal from the X-axis interrupt amount register 83 are also constantly compared by the comparator 8C, and the smaller data is gated.
It is output through 8D or 8E and further through gate 8F.
When the value at X-axis coordinate position 44 becomes smaller than the value at X-axis interrupt coordinate position 80 and gate 7B opens, the interrupt pulse sent from gate 8F is sent to gate 7C, and the X-axis interpolation pulse and interrupt pulse are sent. Are superimposed and sent to the drive unit 5. The interrupt pulse is subtracted from the X-axis interrupt amount register 83 through the gate 8B, and this is repeated until it becomes zero.

In the above embodiment, when any one axis performs the retract control, it is shown that it is superimposed on the interpolation data instructed by the machining program. However, when only retracting is considered, the remaining at the moment of retract. Even if the interpolation data is discarded and the movement control is performed by the interrupt data, the same effect as that of the above embodiment can be obtained.

〔The invention's effect〕

As described above, according to the present invention, the interrupt position, the interrupt speed, the interrupt distance, etc. during the interpolation are processed in parallel with the interpolation control by each unit, and based on the signal from the interpolation circuit unit. An interrupt control unit that constantly monitors the interpolation position, and superimposes an interrupt pulse on the interpolation circuit unit data by the interrupt distance according to the interrupt speed given from the interrupt data storage unit when the interpolation position reaches the interrupt position. Since the configuration is provided, when the tool reaches an arbitrary interrupt position determined in advance during the automatic operation by the machining program, the interrupt distance is superposed on the trajectory by the machining program at the interrupt speed determined in advance. This eliminates the need for complicated calculation of the trajectory in the process of creating a machining program, and also allows manual operation. Without precise interrupt the effect that can be performed automatically.

[Brief description of drawings]

FIG. 1 is a block diagram showing a numerical controller according to an embodiment of the present invention, FIG. 2 is a chart of an axis control interpolation processing chart in the embodiment of the present invention, and FIG. 3 is a concrete view of a main part in the embodiment of the present invention. FIG. 4 is a block diagram showing a schematic configuration of a conventional numerical control apparatus, and FIG. 5 is an axis control interpolation processing chart diagram corresponding to an embodiment of the conventional numerical control apparatus. 1 is a paper tape, 2 is an input unit, 3 is a calculation unit, 4 is an interpolation circuit unit, 5 is a drive unit, 6 is a machine tool, 8 is an interrupt data storage unit, and 9 is a visual display setting unit. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An input unit for reading a machining program, and an arithmetic unit for performing interpolation calculation of a moving locus of a machine and speed calculation based on the machining program read by the input unit.
Based on an interpolation circuit unit that outputs interpolation circuit unit data for controlling each axis in synchronization with each other according to the interpolation calculation result of the movement locus from the calculation unit, and the interpolation circuit unit data from the interpolation circuit unit. In a numerical controller provided with a drive unit for controlling the drive of a motor and the like, an interrupt data storage unit for processing an interrupt position, an interrupt speed, an interrupt distance, etc. in the middle of the interpolation in parallel with the interpolation control by each unit. Provided between the interpolation circuit unit and the drive unit, constantly monitoring the interpolation position based on a signal from the interpolation circuit unit, and given from the interrupt data storage unit when the interpolation position reaches the interrupt position. And an interrupt control unit that superimposes an interrupt pulse on the data of the interpolation circuit unit by the interrupt speed according to the interrupt speed and provides the drive unit with the interrupt pulse. Numerical control device for.