JPH0329005A - Setting system for pitch error correction data on numerical controller - Google Patents

Abstract

PURPOSE:To reduce the working labor of an operator by measuring the pitch error at a correcting point of a machine tool and at the same time setting the pitch error correction data to a memory of a numerical controller. CONSTITUTION:The pitch error produced at a correcting point of a machine tool is measured by a measuring device 27 and at the same time the pitch error correction data is set to a nonvolatile memory 14 of a numerical controller based on the value of the device 27. Thus the pitch error is measured by the device 27 and at the same time the pitch error correction data is set by means of the value of the device 27. Thus the measurement of the pitch error and the set of the pitch error correction data are carried out by the different operations as conventional. As a result, such processing including the production of a parameter tape, etc., can be omitted. Therefore the artificial mistakes are decreased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for setting pitch error correction data for a numerical control device, and particularly for pitch error correction data for a numerical control device that automatically creates correction data when correcting pitch errors. Regarding correction data setting method.

[Conventional technology]

Conventionally, when performing pitch error correction using a numerical control device, the pitch error of each axis was measured and manually inputted to the numerical control device. To measure the pitch error, an operator first positions the machine at a predetermined position (correction point) using a numerical control device. Then, the actual moving distance of the machine is measured using a laser measuring device or the like, and the pitch error is determined from the command value of the numerical control device and the measured value. Pitch error is approximately 100 for each axis
I'm looking for some points. The pitch error correction amounts obtained in this manner are manually input to the numerical control device as correction data for each axis.

Human power to the numerical control device can be manually operated by a talented person in MDI mode, or by creating a parameter table.
It was done manually based on the normal parameter setting procedure of numerical control equipment.

[Problem to be solved by the invention]

However, in the past, the operator himself had to carry out the work of moving the machine to the correction point, calculating the error, and inputting the error correction data. If a human error such as error calculation error or data input error occurs during these operations, incorrect data will be set in the numerical control device. If the data is set incorrectly, it will greatly affect the performance of the machine and prevent accurate machining.

Therefore, when setting the pitch error correction data in the numerical control device, the operator must work carefully to avoid human error, consuming a large amount of time and effort.

The present invention has been made in view of the above points, and an object of the present invention is to provide a pitch error correction data setting method for a numerical control device that reduces the work effort of an operator and prevents the occurrence of human error. .

[Means to solve the problem]

In order to solve the above problems, the present invention provides a pitch error correction data setting method for a numerical control device in which the pitch error of a machine tool is measured with a measuring instrument, and the pitch error is set in the numerical control device as pitch error correction data. A numerical control device characterized in that the pitch error at a correction point of the machine tool is measured by the measuring device, and at the same time, the pitch error correction data is set in a memory of the numerical control device using the value of the measuring device. A pitch error data setting method is provided.

[Effect]

In the present invention, pitch error is measured with a measuring device and, at the same time, pitch error correction data is set using the value of this measuring device. Therefore, it is no longer necessary to measure the pitch error and set the pitch error correction data in separate operations and to create a parameter table as in the past, and the occurrence of human error is reduced.

In the preferred embodiment of the present invention, the machine tool is moved using a manual pulse generator, and the pitch error correction data is calculated from the value of the correction point and the value of the current position of the machine tool after the movement, and proposed a method in which pitch error correction data is calculated from the correction point value and the measurement device value by inputting the value of the device into a numerical control device. These methods reduce operator effort and are less prone to human error.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 2 shows a numerical control device (CNC) for implementing the present invention.
} is a block diagram showing hardware.

The microprocessor 11 controls the entire numerical control device according to a system program stored in the ROM 12. The ROM 12 is an EPROM or an EEPROM. A DRAM is used as the RAM 13, and various data are stored therein. The non-volatile memory 14 stores the machining program 14a1 parameters and the like, and since a battery-backed CMOS or the like is used, the contents are retained even after the numerical control device is powered off.

PMC (7' Logrammable Machine Controller)
15 receives commands for the M function, T function, etc., converts them into signals for controlling the machine tool according to the sequence program t5a, and outputs the signals. Further, limit switch signals from the machine side or switch signals from the machine drawing board are received and processed by a sequence program, and necessary signals are stored in the RAMI 3 via the bus and read by the microprocessor 11.

The graphic control circuit l6 converts data such as the current position and movement amount of each axis into a display signal and sends it to the display device 16a.
The display device displays this. The display device 16a is a CRT,
A liquid crystal display device or the like is used. The keyboard 17 is used to enter various data manually.

The position control circuit 18 receives a position command from the microprocessor 1l and outputs a speed command signal for controlling the servo motor 20 to the servo amplifier 19. Servo amplifier 1
9 amplifies this speed command signal and drives the servo motor 20.

The servo motor 20 includes a position detector 22 that outputs a position feedback signal and a tacho generator 21 that generates a speed feedback signal.
are combined. A pulse coder or the like is used as the position detector 22, and feeds back a position feedback pulse to the position control circuit 18. In addition, a position detector such as a linear scale may be used.

The tachogenerator 21 feeds back a voltage signal corresponding to the rotational speed of the servo motor 20 to the servo amble 19. Also, instead of the tacho generator, the position detector 2
In some cases, the speed signal is generated from the position signal in step 2, and the tachogenerator is omitted. These elements are required as many as the number of axes, but since the MIIa of each element is the same, only the ① axis is described here.

The human output circuit 23 is connected to a control circuit on the machine side, and exchanges input/output signals with the machine side. That is, receiving limit switch signals from the machine and switch signals from the machine operation panel,
The PMC 15 reads this.

It also receives control signals for controlling pneumatic actuators and the like on the machine side from the PMC 15 and outputs them to the machine side.

The manual pulse generator 24 outputs a pulse train for precisely moving each axis according to the rotation angle, and is mounted on a machine simulation board.

A ball screw 26 is connected to the servo motor 20, and as the servo motor 20 rotates, the ball screw 26
It also rotates. The ball screw 26 is provided with a machine-side table 25 that moves according to the rotation of the ball screw 26. In this embodiment, only the X axis is shown.

The measuring device 27 detects the exact position of the table 25 using a laser beam and a reflecting plate 28 fixed to the table.

In the figure, a spindle control circuit, a spindle amplifier, a spindle motor, etc. for controlling the spindle are omitted. Further, although there is one processor here, a multi-processor system using a plurality of processors can be used depending on the system.

Next, the operation of this embodiment will be explained using the drawings.

FIG. 3 is a diagram for explaining the outline of the operation of this embodiment. FIG. 4 is a diagram showing an example of the display screen of the display device during the pitch error correction data setting operation of this embodiment.

First, the numerical control device is put into pitch error correction data setting mode, and rPITcHJ of the soft key 47 is selected. Then, a data input screen as shown in FIG. 4 is displayed on the display device 16a, and the respective data is input into each item.

In the figure, the pitch error correction data setting axis is manually set in item 41 rAX I SJ. Item 42 rNUM
BER FOR REFERENCE POINTJ
Input the number of the pitch error correction point of the reference point NO manually. Item 43 rNUMBER NEAREST
THE ``-'' Enter the number of the most negative pitch error correction point in ENDJ. Item 44 r
N U M B E R NEAREST THE
“+” Input the number of the pitch error correction point on the most positive side to ENDJ.

Enter the pitch error correction magnification in item 45 rMAGNI FICATIONJ. Item 46 “■NTER
The interval between pitch error correction points is entered manually in VALJ. If the axis to be set is a rotation axis, add items 4 to 7 (
7) rMOVEMENT AMOUNT PER
Manually enter the amount of movement per rotation of the rotary shaft type pitch error correction in ROTATIONJ.

After completing various data manually, press rsTAR of soft key 48.
When "T" is selected, the table 25 on the machine side returns to the reference point NO, and then moves to the first correction point N1.

The machine coordinates of the correction point N1 are "rl000", but the value of the machine stop position M1 on the machine side table is r9 9 7J as displayed on the measuring device 27. Therefore, the error to the correct position R1 is "+3". Conventionally, this error was recorded and later set using a parameter tape or the like. In this embodiment, the table 25 on the machine side is moved by the manual pulse generator 24 until the value of the measuring device 27 becomes rl 0 0 0J, and after the movement is completed, the rINPUTJ of the soft key 49 is pressed.
Select. In the numerical control device, the manual pulse generator 24 reads the current position of the machine after movement, calculates error data, and stores it in the nonvolatile memory 14.

The position after movement by the manual pulse generator 24 is "1003". Therefore, inside the numerical control device, the mechanical coordinate rl of the correction point starts from "1003". By subtracting "000", correction data "+3" is created. Then, τ, the mechanical table 25 is moved to the next correction point N2, and the same operation is repeated. At correction point N2, correction data "12" is created,
The data is stored in the nonvolatile memory 14. Setting the pitch error correction data is completed by repeating the above operations up to the last correction point.

FIG. 1 is a diagram showing a flowchart of a pitch error correction data setting method for a numerical control device of the present invention. The numerical value following S in the figure indicates the step number.

[S1] The display screen of the display device 16a is switched to the pitch error correction data manual screen shown in FIG. 4, and data input is requested.

[S2] Press soft key 4 to check whether data input is complete.
The determination is made by inputting ``rsTART'' of 8. If the process has been completed, the process advances to S3; otherwise, the process advances to S1.

[S3] Return the table on the machine side to the reference point.

[S4] Start moving to the correction point. Here, since the movement is from the reference point, it is moved to the first correction point N1. After the operator completes the movement to the correction point in S4, the operator determines whether the table 25 has stopped at a predetermined machine coordinate position from the value displayed on the measuring device 27. If the table 25 is not stopped at the correct position, try moving the table 25 to the correct position using the manual pulse generator 24, and if it is stopped at the correct position, do nothing and press the soft key 49 to ``rlNPUT''. Select a key.

[S5] It is determined whether or not the soft key 49 "rlNPUT" key was pressed manually. If there is an input, proceed to the next step S6.

[S6] It is determined whether the table 25 was moved by the manual pulse generator 24 between S4 and 85. If there has been movement, the process proceeds to S7; otherwise, the process proceeds to S8.

[S7] Read the current position data of the table 25 after movement by the manual pulse generator 24.

[S8] Create pitch error correction data and store it in memory. If there is no movement by the manual pulse generator 24, the value of the machine coordinates is subtracted from the value of the machine stop position, so the pitch error correction data becomes rO. When there is movement by the manual pulse generator 24, the value of the machine coordinates is subtracted from the value of the current position of the machine after movement, so the pitch error correction data becomes the amount of movement by the manual pulse generator 24. The pitch error correction data thus obtained is stored in a memory.

[S9] It is determined whether the position where the bit error correction data is set is the last correction point. If it is the last correction point, the pitch error correction data setting process is completed, otherwise the process advances to S4.

Processing 86 in the above flowchart may be omitted. In this case, the process <37 related to the presence or absence of movement by the manual pulse generator 24 is executed.

In the above embodiment, the operator moves the machine to the correct position using the manual pulse generator 24 after the machine has moved to the correction point. Alternatively, the value of the measuring device 27 may be subtracted from the machine coordinate value by reading it into the control bag holder. In this way, the operator only needs to input the initial pitch error correction data, and then the numerical control device can automatically set the pitch error correction data.

〔Effect of the invention〕

As explained above, according to the present invention, the operator's work effort can be reduced! ! It is possible to provide a pitch error correction data setting method for a numerical control device that reduces the number of pitch errors and prevents the occurrence of human error.

[Brief explanation of drawings]

FIG. 1 is a flowchart of a pitch error correction data setting method for a numerical control device according to the present invention, FIG. 2 is a block diagram showing hardware of a numerical control device (CNC) for implementing the present invention, and FIG. This figure is a diagram for explaining the outline of the operation of this embodiment, and FIG. 4 is a diagram showing an example of the display screen of the display device when setting pitch error correction data of this embodiment. 1l Processor 1 2 ROM 1 3 ---R A M 14 Non-volatile memory 148'・Machining program 1 5 ---P MC (Programmable Machine Controller) 15a Sequence program 16a Display device 17 Keyboard position control circuit servo Amplifier Servo Motor Tacho Generator Position Detector Person Output Circuit Manual Pulse Generator Table Ball Screw Measuring Instrument Reflector

Claims (4)

[Claims] (1) In a pitch error correction data setting method for a numerical control device in which a pitch error of a machine tool is measured with a measuring device and the pitch error is set in a numerical control device as pitch error correction data, the pitch error at a correction point of the machine tool is A pitch error data setting method for a numerical control device, characterized in that the pitch error is measured by the measuring device and, at the same time, the pitch error correction data is set in a memory of the numerical control device using the value of the measuring device. (2) Move the machine tool using a manual pulse generator until the value of the measuring device reaches a predetermined value, and correct the pitch error based on the value of the correction point and the value of the current position of the machine tool after movement. A pitch error correction data setting method for a numerical control device according to claim 1, characterized in that data is calculated and set in the memory. (3) The value of the measuring device is taken into a numerical control device, the pitch error correction data is calculated from the value of the correction point and the value of the measuring device, and is set in the memory. A pitch error correction data setting method for a numerical control device according to scope 1. (4) The numerical control device has a pitch error correction data setting mode, in which after predetermined pitch error correction data is input, the machine tool returns to a reference point, moves to the correction point, and then returns to the pitch error correction data setting mode. Claims 1 and 2 are characterized in that calculation of error correction data is executed.
A pitch error correction data setting method for a numerical control device according to item 1 or 3.