JPH04111004A - Nc device - Google Patents

Abstract

PURPOSE:To obtain the working accuracy closer to a theoretical working shape by calculating an error by comparing a working shape and designed theoretical working shape data, and correcting an NC program by its error. CONSTITUTION:The device is provided with a detecting means 12 for detecting a driving state of each driving part of a working machine 14, and storage means 9, 10, 11, 13 and 7 for inputting and storing detection data from the detecting means 12, a working condition and theoretical working shape data. Also, this device is provided with a working shape correction processing means 13 for reading out each data stored in the storage means 9, 10, 11, 13 and 7, calculating a shape worked actually, based on its data, and also, calculating an error to the theoretical data, and correcting an NC program by its error value. In such a way, it becomes possible to cope quickly with the next working, and the throughput and the working accuracy of a working machine can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an NC device for numerically controlling a processing machine, and in particular,
The present invention relates to an NC device that allows the user to know the shape of a workpiece actually processed by a processing machine without removing it from the processing machine.

[Prior art] Conventional NC devices that numerically control processing machines calculate and display the machined shape based on NC program data when a workpiece (hereinafter referred to as a work) is machined by the processing machine. was. This shows the ideal shape,
The shape was different from the shape that was actually machined, including machining errors.

Therefore, in order to know the actual machined shape, the workpiece must be removed from the processing machine, attached to a separately provided measuring machine, and then measured anew.

[Problem to be solved by the invention]

In the conventional technology as described above, not only does it take a lot of time to remove the workpiece from the processing machine, attach it to the measuring machine, and locate it for measurement, but also it takes a lot of time to attach the workpiece to the measuring machine. Depending on the method, there is a problem that measurement accuracy may be affected by deformation of the workpiece or the like.

There was also the problem that machining had to be temporarily interrupted while waiting for measurement results.

Furthermore, some workpieces require complicated measurements depending on the shape to be machined, in which case a large number of measurement points are required. Therefore, there were problems in that it took a long time to measure and caused unexpected measurement errors.

The present invention was made in view of such conventional problems,
It is an object of the present invention to provide an NC device that eliminates the need for attaching and detaching a workpiece from a processing machine to confirm processing accuracy and that can improve processing accuracy.

[Means to solve problems]

For the above purpose, in the present invention, processing is performed via a servo system 5.6 using an NC program created based on theoretical processing shape data based on the design and processing conditions selected for processing the shape. NC811m section 4 that controls machine 14
An NC device having: a detection means 12 for detecting the driving state of each drive section of the processing machine 14; and input and storage of detection data from the detection means 12, the processing conditions, and the theoretical processing shape data. The storage means 9.10.11.13.7 reads each data stored in the storage means 9.10.11.13.7, calculates the actually machined shape based on the data, and A means for solving the problem is to include a machining shape correction processing means 13 that calculates an error with the theoretical shape data and corrects the NC program using the error value.

[For production]

In the present invention, the driving state of each drive part of the processing machine is detected, and the machined shape can be obtained from that data and predetermined processing conditions, eliminating the inconvenience of having to take measurements again as in the past. do.

In addition, the error is calculated by comparing the above machining shape with the designed theoretical machining shape data, and the error
Since the C program is corrected, the corrected N
By using the C program, machining accuracy closer to the theoretical machining shape can be obtained.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the NC device according to the present invention.

In FIG. 1, reference numeral 1 denotes an NC device, which first inputs known values such as the shape of the tool, the rotational speed of the spindle, the straightness of the X-axis and Z-axis, etc. to the static data input section 11, The data is stored in the static data storage unit IO.

Theoretical shape data on the design is also inputted from the theoretical shape input section 7 and stored in the theoretical shape data storage section 13. After that, the calculation processing unit 8 reads out the theoretical shape data stored in the theoretical shape storage unit 13 and the static data stored in the static data storage unit 10, creates an initial NC program based on these data, and performs NC processing. Store it in the program storage unit.

In addition, when using an existing NC program for ordinary machining, static data and theoretical shape data are added to the program and the NC program input section 2
is input into the NC program and stored in the NC program storage unit as an initial NC program.

To start machining, the NC control section 4 reads an initial NC program from the NC program storage section 3, controls the processing machine 14 through the I10 control section 5 and the servo control section 6, and processes the workpiece.

Here, workpiece machining will be explained using FIG. 2.

FIG. 2 is a partial cross-sectional schematic diagram showing the relationship between a workpiece being processed, a tool, and a laser interferometer for position detection.

In FIG. 2, a work holder 23 is fixed to the end of a spindle 21 which is held by a holding member (not shown) so as to be rotatable and linear on the Z axis.
A workpiece 24 is held at 3. Also spindle 21
A Z-axis stage 22 is disposed between the workpiece holder 23 and the workpiece holder 23. The Z-axis stage 22 is interlocked with the spindle 21 only when the spindle 21 is driven in a straight line. At the predetermined position of the Z-axis stage 22! 1!29 is arranged to reflect the irradiation of laser light 30 from the laser interferometer 28 for detecting the amount of drive in the X-axis direction and guide it to the laser interferometer 28.

In addition, the tool 2 is moved in the linear direction (X direction) perpendicular to the Z axis.
An X-axis stage 26 is slidably fitted onto a sliding X-axis 25 arranged in the X direction for moving the processing portion 7, and a tool 27 is fixed to the X-axis stage 26. Furthermore, a mirror 29'' is placed at a predetermined position on the X-axis stage 26.
is arranged to reflect the irradiation of laser light 30' from the laser interferometer 28' for detecting the amount of drive in the X direction and guide it to the laser interferometer 28'.

The operation during machining will be explained below. When the processing machine 14 receives a machining instruction from the NC control section 4 via the I10 control 5 and the servo control 6, the spindle 21 is rotated and linearly driven under the control of the servo control section 6 according to the initial NC program. The workpiece 24 which is made into one body moves in the same way. At that time, the Z-axis stage 22 is interlocked only when the spindle 21 is driven in a straight line, and the laser interferometer 28 indirectly measures the amount of movement of the workpiece 24 in the X-axis direction via a mirror 29 placed at a predetermined position on the Z-axis stage 22. to be detected.

At the same time, the X-axis stage 26 is driven linearly in the X direction, and the tool 27 integrated with the X-axis stage 26 moves in the same manner. However, the movement of the tool at this time is such that the machined part moves in a straight line direction (X direction) passing through the axis of the Z axis. At this time, the laser interferometer 28' indirectly detects the amount of movement of the tool 27 in the X-axis direction via the mirror 29' disposed on the X-axis stage 26.

As described above, the dynamic data measuring and detecting section 12 including a laser interferometer reads the data of each position according to the amount of movement in the X direction and the X direction during the workpiece machining operation as needed and stores it in the dynamic data storage section 9.

After the processing is completed, the calculation processing section 8 stores the static data storage section 10,
Each piece of data is read out from the dynamic data storage unit 9 and processed shape data is calculated.

FIG. 3 is a diagram illustrating the relationship between theoretical shape data, processed shape data, and shape errors.

After calculating the machining shape data, the calculation processing section 8 calculates the theoretical shape data 1 stored in the theoretical shape data storage section 13.
01 and the calculated machining shape data 102 to calculate a shape error 103.

Also, the correction NC so that the shape error 103 becomes zero
A program is created and stored in the NC program storage section 3.

Next time when the NC device executes the processing operation again, NCI#J? The first section 4 does not use the initial NC program stored in the NC program storage section 3, but reads a newly created correction NC program and executes machining using the I10 control section 5 and the servo control section 6.

In addition, as shown in FIG. 1, the system of this embodiment is as follows.
This is an NC device that includes all functional blocks, but the conventional N
A host computer including a portion of the additional function section 15 of the system of this embodiment may be added to the C device.

Note that although a two-axis processing machine is used in this embodiment, this is merely an example of the axes, and the present invention is not limited to this.

Further, although the description has been made using a laser interferometer for position detection, the present invention is not limited to this, and detection may be performed using an encoder, for example.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to know the machined shape without having to measure the shape again after the workpiece has been machined, so that the next process can be quickly carried out. This is effective in improving the throughput and processing accuracy of the processing machine.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the NC device according to the present invention, Fig. 2 is an explanatory partial cross-sectional view showing the relationship between the workpiece, tool, and position detector during processing, and Fig. 3 is the theoretical shape. It is a figure explaining the relationship between data, processing shape data, and shape error. [Explanation of symbols of main parts] 7... Theoretical shape input section, 8... Calculation processing section, 9... Dynamic data storage section, 10...・Static data storage section, 11... Static data input section, 12... Dynamic data measurement detection section, 13...
・Theoretical shape data storage unit, 28.28°・・・・・・
Laser interferometer, 29.29゛...Mirror, 101...Theoretical shape data, 102...Processed shape data, 103...Shape error.

Claims (1)

[Claims] A processing machine is controlled via a servo system by an NC program created based on designed theoretical processing shape data and processing conditions selected for processing the shape. An NC device having an NC control section, comprising: a detection means for detecting the driving state of each drive section of the processing machine; a first storage means for inputting and storing detection data from the detection means; and a first storage means for inputting and storing detection data from the detection means; a second storage means for inputting and storing the theoretically machined shape data; and a second storage means for reading out each data stored in the storage means, calculating the actually machined shape based on the data, and calculating the actually machined shape based on the data. An NC device comprising: processing shape correction processing means for calculating an error of the error value and correcting the NC program by the error value.