JPH0475106A - Method and device for tool correction of nc machine tool - Google Patents

Abstract

PURPOSE:To automatically perform all the correction processing by transmitting a measured value measured by a digital measuring instrument to an NC device, and calculating the tool correction value of an NC machine tool by comparing it with the targeted dimension value of a work. CONSTITUTION:The digital measuring instrument 6 connected to the NC device 1 of the NC machine tool is used, and the measured value measured by the measuring instrument 6 is transferred to an NC device 1 side via a data communication means 7. At the NC device 1 side, the tool correction value is computed, and tool correction data in the NC device 1 is updated at an appropriate timing such when process migrates to the next working, etc. Thereby, measuring data can be transferred to the NC device side and the correction processing can be automatically executed hereinafter by accurately performing measurement by a measuring person by using the digital measuring instrument 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a tool auxiliary method and apparatus for an NC machine tool.

(Prior Art) Generally, in NC machine tools such as NC lathes, it is necessary to perform tool correction to prevent tool wear.

Conventionally, in order to perform tool compensation, the dimensions of the machined workpiece were determined manually or automatically, tool compensation data was created based on the measured values, and the previous tool compensation data was updated. It is being said.

The conventional tool correction method using manual measurement measures dimensions using a measuring device such as a caliper or a micrometer, calculates a tool correction value from the measured value, and rewrites the tool correction data in the NC device.

In this manual measurement tool correction method, measurement is performed manually using a caliper or a micrometer, so there is a risk of reading or inputting errors in the measured values. Furthermore, since the tool correction value is manually calculated and the tool correction data is manually updated, there are problems such as the need for a lot of effort.

In addition, in the conventional tool compensation method using automatic measurement, the machining dimensions are measured using the control axis of the NC machine tool, or the machining dimensions are measured using a contact or non-contact type dedicated measuring instrument. A rough feed hack is performed on the NCC device side to obtain a tool correction value, and the tool correction data of the NC device is updated.

In this tool compensation method using automatic measurement, automatic measurement using the control axis uses an in-machine meter using a touch sensor, etc., which causes measurement errors due to entanglement with chips, etc., and measurement errors due to the mechanical system. There are many problems, such as being affected by the usage environment. In addition, measurement using a dedicated measuring instrument requires peripheral equipment for handling, which poses a problem in that the measuring instrument including the peripheral equipment becomes quite expensive and lacks versatility.

(Problems to be Solved by the Invention) As mentioned above, in the conventional tool correction method for NC machine tools, manual measurement requires a lot of effort for measurement, correction value calculation, and data updating. However, there are problems in that it requires a lot of time and effort and may lead to input errors.

In addition, the tool correction method for NC machine tools that uses automatic measurement has problems such as low reliability of measured values, expensive equipment, and limited applicability that prevents general use. Ta.

Therefore, the present invention makes it possible to accurately measure machining dimensions using a general digital meter while visually confirming the measurements, and then automatically performs all correction processing, including the input of measurement data. The purpose of the present invention is to provide a tool resetting method for an NC processing machine and an apparatus therefor.

[Structure of the Invention (Means for Solving the Problems) To solve the above-mentioned problems, the tool replenishment method for an NC machine tool of the present invention provides a digital type data transmission method to an NC device of an NC machine tool via a data transmission means. Connect a measuring device, use the digital measuring device to measure the machining dimensions of the workpiece processed by the NC machine tool, and send the measured values measured by the digital measuring device to the NC device. , calculating a tool correction value for the NC machine tool by comparing the measured value received by the NC device with a target dimension value of the workpiece, and updating tool correction data based on the calculated tool correction value. It is characterized by

In this case, the calculation of the tool correction value is performed during automatic operation for the next workpiece, and the tool correction data is updated after machining of the workpiece is completed.

Further, the tool correction device for an NC machine tool of the present invention includes a digital measuring device that measures the machining dimensions of a workpiece machined by the NC machine tool, and a digital measuring device that measures the machining dimensions of a workpiece machined by the NC machine tool, and converts the measured values of the digital measuring device into the N of the NC machine tool.
a data communication means for transmitting data to the C device; and a data communication means provided in association with the NC device, which compares the measured value received via the data transmission means with a target dimension of the workpiece, and calculates a tool correction value. The present invention is characterized by comprising: a tool correction value calculating means; and a tool correction data updating means for updating tool correction data at an appropriate timing based on the calculated tool correction value.

(Function) In the tool auxiliary method and device for an NC machine tool of the present invention, a digital Ml measuring instrument connected to the NC device of the NC machine tool via a data communication means is used, and the The measured value is transferred to the NC device side via the data communication means, a tool correction value is calculated on the NC device side, and the tool correction data of the NC device is updated at an appropriate timing such as when moving to the next machining.

As the digital measuring device, a digital micrometer or a digital caliper can be used, and the data communication means is constituted by a communication cable and its accessories that connect these digital measuring devices and the NC device.

Therefore, if the measurer measures accurately using a digital measuring instrument, the measured data is transferred to the NC device, and all subsequent correction processing is performed automatically.

(Example) In the NC lathe shown in FIG. 1 as an example of an NC machine tool, the NC lathe 1 has a chuck device 2 and a tool stand 3 disposed opposite to the chuck device 2, and is similar to a general NC lathe. To,
The work fixed on the chuck device 2 is rotated, and the tool stand 3
A workpiece (not shown) is cut using a cutting tool indexed by the indexing operation of the tool turret by applying forward/backward and left/right feeding motions to the tool turret.

An NC operation panel 4 is provided on the upper part of the main body of the NC lathe 1 in a position and posture that are easy to see and operate.

The NC operation panel 4 includes an operation panel surface and a display screen. These switches and lamps provided on the NC operation panel 4 are connected directly or indirectly to the NC device provided in the heavy-duty electrical panel, and can issue appropriate commands to the NC device, and can also operate the NC device. The content can be displayed as appropriate.

Further, in the NC lathe 1 of this example, a connector connecting portion 5 is provided near the NC operation panel 4, and this connector connecting portion 5
A digital micrometer 6 as an example of a digital measuring instrument is connected to the connector via a communication cable 7 .

As shown in detail in FIG. 2, the digital micrometer 6 is equipped with a display 8 that digitally displays the measured value and a data transmission switch 9. When the switch 9 is pressed, the measured value at that time is displayed. The communication cable 7 is configured to provide power to the communication cable 7.

A connector 1o is provided at one end of the communication cable 7, and this connector 10 is connected to the connector 3 provided at the connector connection portion 5.
Channel connector hole 11-1゜11-2.11-3
It is designed to be inserted and connected to one of the two.

The connector connection portion 5 is provided with a lid 5a for covering the connector connection surface when the connector 1o is removed.

In the NC lathe 1 having the above configuration, when the work contents for the machining to be performed are edited using the display device 4a of the NC operation panel 4 and a start command is given to the NC device, the chuck device 2 is rotated and the tool The table 3 is sent and predetermined cutting is performed using the determined cutting tool. At this time,
Since the cutting tool wears out during machining, in order to compensate for this, the NC device is provided with a memory that stores tool compensation data, and the tool stand 3 operates with as much compensation as is stored in this memory. It is now possible to do so.

FIG. 3 is a block diagram showing the connection relationship between the digital measuring instrument and the NC device.

In the figure, in addition to the digital micrometer 6 described above, a digital caliper 12 is shown as a digital measuring instrument. In this way, in this example, the connector connection part 5
Up to three digital measuring instruments can be connected to the

As shown, each communication cable 7 is connected to a multiplexer 13 via a connector connection 5, and this multiplexer 13 is connected to a communication interface (R5232C) 14.
It is connected to the NC device 15 via. The multiplexer 13 and the NC device 15 are arranged in a mechanical power panel 16.

The multiplexer 13 selects a desired measuring device from among a plurality of measuring devices, latches data sent from the measuring device, and transfers the data to the NC device 15.

In the NC lathe 1 having the above configuration, the tool compensation device includes the digital measuring device 6.12, the communication cable 7, the connector connection section 5, the multiplexer 13, the tool compensation value calculation section 15g of the NC device 15, and the data update section. 15b.

FIG. 5 shows the processing method of the tool correction device having the above configuration. In this example, machining dimensions and
The tolerance, correction number, and axis and direction to be corrected are registered in advance for each measuring instrument, and the correction value is calculated based on these.

That is, the operator performs the following operations on the NC device 15 (on RT4a).
Correction direction A, correction number B, processing dimension D, tolerance upper limit d1
．． When the tolerance lower limit d2 and the maximum correction amount W m 21 are manually entered using keys, the NC device 15 calculates the machining target dimension D1 based on the manual data.

DI −DI (d+ +d2)/2 ・■
Therefore, in step 401, it is determined whether or not these data are input, and if so, step 402.40
3, if the limit value is not exceeded, that is, the limit is not exceeded, the machining target q method is calculated, and step 404 waits for the manual input of the measured data.

Next, in step 404, if there is manual input of the measurement data,
Step 405 Manually input the lever value D2, Step 406
By taking the difference between the measured dimension D2 of the lever and the target machining dimension D1, the corrected increase/decrease ΔD can be determined by setting A to 1 or 1.

△D-(D2 DI) ・A ・■Step 407 Then, it is determined whether this value is over the limit, and if it is not over, the process moves to step 408.
This △D is the correction value W of the correction number B that has been input in advance.
The optimum correction value W' is calculated by adding the above.

W--W+△D ・■Step 4
In step 09, it is determined whether this value exceeds the limit, and if it does not exceed the limit, in step 410, the tool correction data of the NC device is updated with this value.

These processes can be performed in parallel with the machining process, except for the correction value update process in step 410, so the measurement can also be performed during machining of the next workpiece, in which case the machining of that process After completing the process, the tool correction data for the measured portion may be updated.

If the limit is exceeded in steps 402, 407, and 409, the process moves to step 511, an error message is displayed, and in the next step 412, the operating state of the reset button is determined, and when the reset button is turned on, step 40
Return to 1.

In this example, for key human data, step 402
The data is compared with a preset input range, and if the limit value is exceeded, an error message is displayed on the CRT 4 to notify the operator that incorrect data has been input.

In addition, in order to prevent correction data from being rewritten due to abnormal data, a maximum correction amount Wmxx is provided, and by comparing this with the correction value W- in step 409, it is also possible to monitor erroneous measurements and significant tool wear. There is.

Furthermore, in step 407, the calculated value △D
It is determined whether or not the value exceeds the maximum correction increase/decrease, and if this is exceeded, an error message is displayed to notify that the data from the measuring device is inappropriate.

Therefore, in this example, it is possible to accurately measure while visually checking using the digital measuring device 6°12, and also to exclude data that has been input incorrectly, and to update tool correction data according to tool wear. Appropriate machining can be performed so that the machining dimension approaches the tolerance center dimension.

Moreover, the digital measuring device 6.12 connects a general-purpose digital measuring device to N via the communication cable 7 and the connector 10.
Since it is simply connected to the C device side, it is easy to use and even non-experts can easily perform correction processing. Furthermore, since the measuring instrument is a general one, it can be applied not only to various machines, but also to various types of processing, and has versatility. Furthermore, since no improvement is required on the NC device side except for the addition of the multiplexer 13 and some improvements in the software, there will be no significant cost increase.

[Effects of the Invention] As described above, the present invention has N as described in the claims.
Since this is a tool replenishment method and device for C-processing machines, it is possible to accurately measure machining dimensions using a general digital measuring device while visually confirming the measurements, and the rest including inputting the measurement data. All corrections can be processed automatically.

Further, since the tool correction device has a structure in which a general digital measuring device is connected to the NC device side via a communication cable, the measurement operation is easy and it can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an NC lathe in which the present invention is implemented, and FIG. 2 is a perspective view of a digital micrometer according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram showing the connection relationship between the digital measuring instrument and the NC device, and FIG. 4 is an explanatory diagram showing the mounting method on the C lathe. FIG. It is a flowchart which shows an example. 4...NC operation panel 5/Connector connection part 621. Digital micrometer 7...Communication cable 12...Digital caliper 13...Multiplexer 15...NC device 15a...Correction value calculation section 15b...Data update section

Claims (3)

[Claims] (1) Connect a digital measuring device to the NC device of the NC machine tool via a data transmission means, use the digital measuring device to measure the machining dimensions of the workpiece machined by the NC machine tool, and The tool correction of the NC machine tool is performed by transmitting a measurement value measured by a digital measuring instrument to the NC device and comparing the measurement value received by the NC device with a target dimension value of the workpiece. A tool correction method for an NC machine tool, comprising: calculating a value, and updating tool correction data based on the calculated tool correction value. (2) In the NC according to claim 1, the calculation of the tool correction value is performed during automatic operation for the next workpiece, and the updating of the tool correction data is performed after the machining of the workpiece is completed. Tool repair method for machine tools. (3) A digital measuring device for measuring the machining dimensions of the workpiece machined by the NC machine tool;
a data communication means for transmitting data to the C device; and a data communication means provided in association with the NC device, which compares the measured value received via the data transmission means with a target dimension of the workpiece, and calculates a tool correction value. A tool correction device for an NC machine tool, comprising: a tool correction value calculating means; and a tool correction data updating means for updating tool correction data at an appropriate timing based on the calculated tool correction value.