JPH0592349A - Numerically controlled device - Google Patents

Abstract

PURPOSE:To dispense with a measuring NC program by preparing a locus for the approaching of measured value to a workpiece on the basis of the coordinate value of each axis when measuring command appears in the machining NC program, measuring its dimensions, and storing the results of measurement. CONSTITUTION:After a NC program is read in the NC device of a machine tool from a NC program memory 8, a measuring command signal is added into a moving command block in the NC program by a command signal adding apparatus 14, and stored in the memory 8 again. The NC program is read in from a NC program reading out apparatus 9 and then analized to calculate moving quantity and speed on each axis. In addition, the presence of the measuring command signal is judged, and a measuring command is issued in the case of the existing of the measuring command signal, and the moving quantity on the each axis is read in from a NC program interpreting apparatus 18 through a coordinate value calculating apparatus 15, and the coordinate value on each axis in the NC program is calculated from the above moving quantity, and the coordinate value measured by a coordinate measuring instrument 19 when a detector 22 attains the workpiece is stored in a measured value memory 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to numerical control of machine tools (N
C) The present invention relates to an apparatus, and more particularly, to an improvement for enabling processing and measurement to be performed by the same NC program.

[0002]

2. Description of the Related Art FIG. 9 shows the appearance of an example of a machine tool. In the machine tool of FIG. 9, the table 1 is in the front-back direction (X-axis direction:
The saddle 2 moves in the left-right direction (Y-axis direction), and the ram 3 ejected from the saddle 2 moves in the vertical direction (Z direction).
The bridge 4 on which the saddle 2 is arranged moves in the vertical direction (W direction: parallel to the Z axis) to be attached to the tip of the ram 3 with respect to the work 5 installed on the table 1. Processing such as cutting is performed with the tool 6. Figure 9
Inside, 7 is a tool holder.

The axial movement of such a machine tool is controlled by a numerical controller (NC device). A general configuration of the numerical controller will be described with reference to FIG.

In FIG. 10, the movement locus of the tool is described in advance as a machining NC program and stored in the NC program storage unit 8. The NC program reader 9 sequentially reads the NC programs from the NC program memory 8 and outputs them to the NC program interpreter 10. N
The C program interpreter 10 interprets the NC program,
The moving amount and moving speed of each axis are obtained for each command unit of the C program. The movement command generator 11 obtains the movement amount of each axis for each minute unit time for driving the servo circuit 12 based on the movement amount and movement speed of each axis, and uses this for the servo circuit 12
Output to. The servo circuit 12 drives the feed motor 13 for each axis according to the movement amount of each axis for each minute unit time.

By controlling the axial movement of the machine tool by the numerical control device as described above, that is, by storing the movement locus of the tool in the numerical control device as a machining NC program in advance, or by successively supplying it during machining. The machine tool cuts the work into a desired shape.

Further, after cutting, it is often desired to measure the size of the work in order to confirm that the work has been machined to the desired size. In such a case, the following (1),
The dimension is measured as in (2). (1) While the workpiece is installed in the machine tool, the tool at the ram tip is replaced with a measuring device such as a touch sensor, and then each axis is moved by the NC program for measurement to measure the dimension. (2) The workpiece is re-installed from the machine tool to the measurement-dedicated machine, and the axes of the measurement-dedicated machine are moved by the measurement program to measure the dimensions.

[0007]

In any of the above (1) and (2) dimension measurement, it is necessary to create two NC programs for processing and measurement, which is very time-consuming. is there. Therefore, it is an object of the present invention to provide a numerical controller that does not need to independently create a measuring NC program.

[0008]

The numerical controller according to the present invention has a structure in which a measuring command symbol is added to a machining NC program and a coordinate value of each axis is sequentially calculated from a moving amount on the NC program. A means for storing the measurement result of the dimension of the work, a means for creating a trajectory for approaching the measuring device so as not to interfere with the work, and a means for interpreting a measurement command symbol on the NC program and outputting it as a measurement command. And means for selectively removing the measurement instruction.

[0009]

By adding the measurement command symbol to the conventional NC program for machining, when the measurement command appears in the NC program, the trajectory for approaching the measuring instrument to the workpiece based on the coordinate values of each axis is set. Create, move the measuring instrument to measure the dimensions, and store the measurement results. In the case of processing, the measurement command is removed and control is performed in the same manner as in the past. Therefore, simply add the measurement command symbol to the machining NC program,
The size of the work can be measured and the result can be stored.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows the configuration of a numerical controller according to an embodiment of the present invention. The NC program interpreter 18 has a different function from the conventional example shown in FIG. A coordinate value calculator 15, a measurement value memory 16, an approach trajectory generator 17, and a measurement command remover 21 are added. Further, additionally, a coordinate measuring device 19, a mode changeover switch 20, and a detector 22 such as a touch sensor are used.

The measurement command symbol adder 14 adds a symbol indicating a measurement command, that is, a measurement command symbol, to the machining NC program stored in the NC program memory 8 in which the movement locus of the tool is described. For example, a CRT display / input device is used to display the NC program in the NC program storage unit 8 and the measurement command symbol is added to the moving block in the NC program by its editing function. The following (a) and (b) can be considered as examples of the measurement instruction symbol. (A) A code called a G code that defines the NC function with a specific number. For example, the symbols in the left column of the table below. (B) Sequence No. added at the beginning of the block of the NC program (Number) with a specific symbol added. For example, the symbols in the right column of the table below.

[0013]

[Table 1]

The NC program interpreter 18 interprets the NC program to which the measurement command symbols are sequentially read by the NC program reader 9 from the NC program memory 8 and interprets the moving amount and moving speed of each axis as in the conventional case. As a new function, when a measurement command symbol appears in the NC program, it is interpreted and the measurement command is output.

The mode selector switch 20 switches between the machining mode (contact B) and the measurement mode (contact A) peculiar to the present invention by switching between the two contacts A and B.

In the machining mode (contact B), the output of the NC program interpreter 18 is input to the measurement command remover 21. The measurement command remover 21 removes only the measurement command and gives the movement amount and movement speed of each axis to the movement command generator 11 as in the conventional case. As a result, the movement command generator 11 obtains the amount of movement of each axis for each minute unit time and gives it to the servo circuit 12 to drive each axis feed motor 13, so that the same machining as in the conventional case is realized.

In the measurement mode (contact A), the output of the NC program interpreter 18 is input to the coordinate value calculator 15. However, the tool is replaced with the detector 22 such as a touch sensor in advance.

The coordinate value calculator 15 sequentially calculates the coordinate value of each axis on the current program based on the movement amount of each axis output from the NC program interpreter 18, and only when the measurement command is input. , The coordinate value at that time is approach trajectory generator 1
7 and the measured value storage 16 are output.

The approach locus creator 17 creates a locus for approaching the workpiece without interference by the detector 22 based on the coordinate values from the coordinate value calculator 15, and causes the movement command creator 11 to move each axis. The amount and the moving speed are sequentially output. For example, as shown in FIG. 2, while the detector 22 is sufficiently separated from the work 5 with respect to the Z-axis, the detector 22 is rapidly moved to the target X-axis and Y-axis coordinate values, and then the Z-axis is used. The Z-axis coordinate value is used to fast-forward a certain distance to the front, and finally, an approach trajectory is created in which the detector 22 is moved by a minute feed until reaching the workpiece 5, and the movement of each axis on this approach trajectory is created. The amount and the moving speed are calculated and sequentially output to the moving command generator 11.

As a result, the movement command generator 11 obtains the amount of movement of each axis for each minute unit time and gives it to the servo circuit 12,
Since each axis feed motor 13 is driven, the detector 22 reaches the work 5 without interference.

When the detector 22 reaches the work, the detector 22 outputs a work arrival signal 23 to that effect to the measured value storage 16 and the approach trajectory generator 17.

The measured value memory 16 stores the work arrival signal 23.
When receiving, the measurement value of the coordinate measuring device 19 at that time, for example, the measurement value of the position measuring device of each axis provided in the conventional machine tool is stored. This measured value is the actual size of the workpiece, and the coordinate value input from the coordinate value calculator 15 to the measured value storage unit 16 and stored is the workpiece size on the NC program, and the machining accuracy can be known by comparing the two.

The approach locus creator 17 starts moving from the time the work arrival signal 23 is received, the move command creator 11 starts.
A zero movement amount is output to, and it is confirmed by the signal 24 that the measured value storage 16 stores the measured value, and the process waits until the next measurement starts.

Each of the above-mentioned devices 9, 18, 15, 16, 1
7, 11, 12, 13, 22, and 19 repeat the respective operations until the NC program ends, and measure the work size.

The numerical control device of the above-described embodiment can be realized by executing software using a central processing unit (CPU) such as a microcomputer. 3 to 8 show these flowcharts.

FIG. 3 shows a software flowchart of the measurement command symbol adder. First, in step S1, NC
The NC program is read from the program memory 8, and in the next step S2, the measurement command symbol is added to the movement command block in the NC program. Then, in step S3, it is determined whether or not the addition of the measurement command symbol is continued. If the addition is not continued, in step S4, the NC program memory 8
Output NC program with measurement instruction symbol added to
Remember.

FIG. 4 shows a flow chart of the software of the NC program interpreter 18. First, the NC program from the NC program reader 9 is read in step S1, and the NC program is interpreted in step S2 to calculate the moving amount and moving speed of each axis (step S3) and output (step S4). To do. Then, in step S5, it is determined whether or not there is a measurement command symbol, and if there is, a measurement command is output in step S6. In either case where there is no measurement command symbol or when a measurement command is output, step S7
At, it is determined whether the NC program is completed, and if it is not completed, the process returns to step S1.

FIG. 5 shows a flowchart of the software of the coordinate value calculator 15. First, the moving amount of each axis is read from the NC program interpreter 18 in step S1, the coordinate value of each axis on the NC program is calculated from the moving amount in the next step S2, and the measurement command is input in step S3. If it is input, the coordinate value at that time is output in step S4, and the process returns to step S1. Even if the measurement command is not input in step S3, the process returns to step S1 and repeats the process unless the NC program ends (step S5).

FIG. 6 shows a software flow chart of the measured value storage 16. First, it is determined in step S1 whether or not the NC program is completed, and if not, it is determined in step S2 whether or not there is a measurement start, that is, a measurement command. If the measurement is not started, the process returns to step S1, and if the measurement is started, the coordinate values of each axis on the NC program are stored in step S3. After that, in step S4, it is determined whether or not the detector 22 has reached the workpiece, and if it has reached, in step S5, the measured coordinate value of the coordinate measuring device 19 at that time is stored, and the process returns to step S1. Repeat until the program ends.

FIG. 7 shows a flow chart of the software of the approach trajectory generator 17. First, it is determined in step S1 whether or not the NC program is completed, and if not, it is determined in step S2 whether or not the measurement is started. If the measurement is not started, the process returns to step S1, and if the measurement is started, the approach locus of the detector 22 is created based on the coordinate value of each axis on the NC program in step S3. Therefore, in step S4, it is determined whether or not the detector 22 has reached the work. In step S5, the movement amount and movement speed of each axis are output to the movement command generator 11 until the detector 22 reaches the work. To move. When the detector 22 reaches the work, the detector 22 outputs the movement amount of zero in step S6.
Is stopped, and in the next step S7 the storage of the measured coordinate values in the measured value storage 16 is confirmed, then the process returns to step S1 and is repeated until the NC program ends.

FIG. 8 shows a software flowchart of the measurement instruction remover 21. First, in step S1, NC
The output of the program interpreter 18 is read, the measurement command is removed in step S2, and the movement amount and movement speed of each axis are output in step S3. NC in step S4
It is judged whether or not the program is completed, and the process is repeated by returning to step S1 until it is completed.

[0032]

According to the present invention, the measurement NC program can be made to act by simply adding a measurement command symbol to the machining NC program. Therefore, N dedicated to measurement
It is not necessary to create a C program separately, which contributes to simplification of work.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of creating an approach trajectory.

FIG. 3 is a flowchart of a measurement command symbol adder.

FIG. 4 is a flowchart of an NC program interpreter.

FIG. 5 is a flowchart of a coordinate value calculator.

FIG. 6 is a flowchart of a measurement value storage device.

FIG. 7 is a flowchart of an approach trajectory generator.

FIG. 8 is a flowchart of a measurement instruction remover.

FIG. 9 is a diagram showing an example of a machine tool.

FIG. 10 is a diagram showing a conventional example.

[Explanation of symbols]

 8 NC program memory 9 NC program reader 11 Movement command generator 12 Servo circuit 13 Each axis feed motor 14 Measurement command symbol adder 15 Coordinate value calculator 16 Measured value memory 17 Approach trajectory generator 18 NC program interpreter 19 Coordinate measuring instrument 20 Mode selector switch 21 Measurement command remover 22 Detector

Claims (1)

[Claims] 1. A means for adding a measurement command symbol to a machining NC program, a means for sequentially calculating coordinate values of each axis from a moving amount on the NC program, and a means for storing a measurement result of a dimension of a work. A means for creating a trajectory for approaching the measuring device so as not to interfere with the work, a means for interpreting a measuring instruction symbol on the NC program and outputting as a measuring instruction, and a means for selectively removing this measuring instruction. A numerical control device characterized by: