JPH0365706A - Data correction device - Google Patents

Abstract

PURPOSE:To exactly form the shape of a cam by correcting a relative position between the angle of rotation of the cam and a grinding stone by correcting the feed quantity of the grinding stone on the basis of the angle of rotation of the cam. CONSTITUTION:A control part 30 can input each target position data set beforehand in an X-axis data memory 13 and a C-axis data memory 19 according to time outputted by a time counter 12, and calculates the rotation quantities of an X-axis motor 6 and a C-axis motor 2 on the basis of each input target position data, and outputs the rotation quantities to an X-axis servo-amplifier 14 and a C-axis servo-amplifier 20. A data correction device is provided with a correcting part 31 to correct an error between the moving position of a slide 7 and the angle of rotation of the cam 1 to be caused by the execution of feedback control by the control part 30 on the basis of deviation caused by this feedback control. The target position data of the slider 7 is corrected on the basis of the target position data of the cam 1. Thus, the positional relation between the cam 1 and the slider 7 is corrected relatively, and the correct shape of the cam can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for an NC machine tool or the like that manufactures a master cam by grinding. The present invention relates to a data correction device that can correct the relative position between the rotation angle and the feed amount and form a cam shape accurately.

(Prior Art) Generally, due to recent advances in automation technology, in various manufacturing factories, for example, the grinding process of grinding the object to be ground with a grindstone may be performed using so-called NC machine tools. Conventionally, such NC machine tools have been constructed as shown in FIG. 4, for example, and have been used to perform such grinding operations.

The figure shows a cam 1 as the object to be ground, which becomes the master cam.
However, a grindstone 4 rotated by a cam motor (hereinafter referred to as C1dl motor) 2 and rotated by a grindstone motor 3 in the same direction as the rotation direction of this cam 1 is rotated by a slider movement motor (hereinafter referred to as X-axis motor) 6. A control device 8 is attached to a slider 7 that moves perpendicularly to the rotation axis of the cam 1, and controls the C-axis motor 2 and the X-axis motor 6, respectively, thereby grinding the cam 1 with a grindstone 4. The NC machine tool forming the desired cam shape is schematically shown.

The control device 8 may be configured as shown in FIG. 5, for example.

As shown in the figure, the control device 8 receives control signals such as starting and ending the grinding process from an external control device 10 that manages the grinding process, and controls each of the X-axis motor 6 and the C-axis motor 2. A control section 11 is provided to control the image forming apparatus. This control unit 11 is connected to an X-axis data memory 13 in which target position data for moving the slider 7 relative to the cam 1 is stored.
The target position data is stored in advance in accordance with the time output by the time counter 12 as shown in FIG. Then, the control unit 11 reads the target position data stored in the X-axis data memory 13 based on the current time output by the time counter 12, and based on this target position data, the rotation amount of the X-axis motor 6 is is calculated, and this amount of rotation is output to the X-axis servo amplifier 14.

Then, the servo amplifier 14 supplies power to the X-axis motor 6 according to the input rotation amount, and by driving the X-axis motor 6, the slider 7 moves to the target position corresponding to the target position data. At the same time, the X-axis pulse generator (hereinafter referred to as X-axis PG) 15 detects the rotation amount of the X-axis motor, and the X-axis position counter 16 converts this rotation amount into current position data corresponding to the target position data. The data is converted and output to the control unit 11. That is, the control unit 11 performs feedback control of the X-axis motor 6 using the XIdlPG 15 and the X-axis position counter 16.

In addition, this control device 8 includes an X-axis correction device that corrects the target position data based on the deviation in order to reduce the error between the moving position of the slider 7 and the target position due to the deviation caused by such feedback control. A section 17 is provided. This X-axis correction section 17 includes an X-axis position counter 16
The deviation between the current position data and the target position data is calculated manually, and as shown in FIG. The data is stored in the X-axis correction data memory 18 in correspondence with the output time. Then, the control unit 11 reads out the corresponding deviation from the X-axis correction data memory 18 based on the current time output from the time counter 12, and reads out the corresponding target position data from the X-axis data memory 13. This target position data is corrected by the deviation (specifically, a correction value is calculated using a predetermined correction function based on the deviation, and this correction value is added to the target position data). Based on the target position data, the X-axis motor 6 is driven via the X-axis servo amplifier 14 as described above.

On the other hand, the control unit 11 similarly controls the C-axis motor 2 that rotates the cam 1 with a C-axis data memory 19, a C-axis servo amplifier 20,
It is driven and feedback-controlled by a C-axis pulse generator (hereinafter referred to as C9111PG) 21, a C-axis position counter 22, a C-axis correction section 23, and a C-axis correction data memory 24. These members are the same as the above-mentioned members for controlling the X-axis motor 6 and operate in the same manner, so a description thereof will be omitted.

In this way, the control unit 11 corrects each target position data set in advance for the time output by the time counter 12 based on the deviation obtained through repeated learning,
By individually controlling the X-axis motor 6 and the C-axis motor 2 using the corrected target position data and controlling the operations of the cam 1 and the grindstone 4, the cam 1 can be ground into a desired shape. ing.

(Problem to be solved by the invention) However, in such a conventional control device,
The target position data of the X-axis motor 6 and the target position data of the other C motors 2, which are set in advance with respect to time, are individually corrected, and each target position data is corrected by feedback. Although it can be corrected based on the deviation caused by the control, it can be corrected based on the operation of the X other motor 6 and the C other motor 2, that is, the relative positional relationship between the rotation angle of the cam 1 and the position of the grindstone 4. On the other hand, it is not possible to correct the error caused by the deviation, and there is a risk that an error will occur between the rotation angle of the cam 1 and the position of the grindstone 4, making it impossible to form the desired cam shape. .

The present invention was made to solve these conventional problems, and by correcting the feed amount of the grinding wheel based on the rotation angle of the cam, it is possible to correct the relative relationship between the rotation angle and the feed amount. It is an object of the present invention to provide a data correction device that can correct the position and accurately form a cam shape.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides respective actuating means for actuating each actuating member that requires a related operation, and a predetermined actuating means for actuating each actuating member that requires a related operation. A storage means for storing target position data for each of the operation means, a feedback control means for feedback controlling each of the actuation means based on the target position data stored in the storage means, and the feedback control means. Detecting the target position data of the respective actuating members corresponding to the current position data of the reference actuating member from among the current position data of the respective actuating members fed back by and correction means for correcting the target position data of each of the other actuation members based on a deviation that occurs when the feedback control means performs feedback control of the actuation means for actuating the other actuation members. shall be.

(Function) The present invention configured as described above functions as follows.

The feedback control means operates each actuating member by feedback controlling each actuating means based on the target position data stored in the data storage means,
The actuating members are caused to perform their associated actions. At the same time, the feedback control means inputs current position data corresponding to the current position of each actuating member and outputs this current position data to the correction means. Then, the correction means detects target position data of the actuating member corresponding to the current position data of the reference actuating member, and also detects target position data of the other actuating members corresponding to this target position data and the current position data of the actuating member. The deviation from the position data is repeatedly memorized. The feedback control means manually inputs a corresponding deviation from the correction means when performing feedback control of the actuation means other than the actuation means that actuates the reference actuation member, and corrects the target position data based on this deviation. Feedback control.

Therefore, the reference actuating member operates based on preset target position data, and the other actuating members operate while correcting deviations from that operation. The movement with the part and profit is relatively corrected.

(Example) Below, a data correction device according to the present invention will be explained in detail based on the drawings.

FIG. 1 is a schematic configuration diagram of a data correction device according to the present invention, and the figure shows, for example, a control device for an NC machine tool that forms a cam using a grindstone as described in the related art.
A data correction device is shown that corrects the operation of a grindstone moved by an X other motor based on the operation of a cam rotated by another motor. Incidentally, the same members as those described in the related art are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

As shown in the figure, this data correction device is connected to an external control device 10 and manually inputs control signals such as processing start and end, as in the conventional case, and controls the X and other motors 6 and C and other motors 2, respectively. A section 30 is provided. This control section 30
can input the respective target position data preset in the X-axis data memory 13 and the C-axis data memory 19 according to the time output by the time counter 12, and can input the target position data preset in the X-axis data memory 13 and the C-axis data memory 19 according to the time outputted by the time counter 12. calculate the rotation amounts of the X-axis motor 6 and C-axis motor 2, and calculate these rotation amounts by
It is designed to output to the axis servo amplifier 14 and the C-axis servo amplifier 20, respectively.

These servo amplifiers 14 and 20 supply electric power corresponding to the amount of rotation manually applied to the X-axis motor 6 and C-axis motor 2, respectively, and drive the X-axis motor 6 and C-axis motor 2 to drive the slider. 7 and the cam 1 are adapted to move to target positions corresponding to the target position data, respectively.

Also, at the same time, the X-axis PG15 and CIdlPG21
The rotation amounts of the axis motor 6 and the C-axis motor 2 are detected, and these rotation amounts are output to the X-axis position counter 16 and the C-axis position counter 22, respectively. And X-axis position counter 1
6 and C-axis position counter 22 convert these rotation amounts into current position data corresponding to the respective target position data, and output the data to the control unit 30. That is, the control unit 30 is capable of feedback controlling the X-axis motor 6 using the XIdtPG 15 and the X-axis position counter 16, and the C-axis motor 2 using the C41dlPG 21 and the C-axis position counter 21, respectively.

Furthermore, this data correction device corrects an error between the movement position of the slider 7 and the rotation angle of the cam 1, which is caused by the control section 30 performing such feedback control, based on the deviation caused by the feedback control. A correction section 31 is provided. This correction section 31 is
The current position data of the slider 7 output by the X-axis position counter 16 and the cam 1 output by the C-axis position counter 22
The current position data of the rotation angle is input. Then, the correction unit 31 includes the C-axis data memory 19
Search for target position data corresponding to the current position data of cam 1 from among the target position data stored in Input from data memory 13. Then, the correction unit 31 corrects this target position data and
The deviation from the current position data of the slider 7 manually input from the axis position counter 16 is calculated, a correction value is obtained from this deviation by a predetermined correction function, and this correction value is sent to the time counter 1.
X-axis correction data memory 1 corresponds to the time output by 2.
8 to be memorized. That is, the correction unit 31 searches for target position data of the cam 1 corresponding to the current rotation angle of the cam 1, and searches for the target position data of the slider 7 stored in the X-axis data memory 13 at the same time as this target position data. Correction values are set for the data.

When the control unit 30 operates the X-axis motor 6 and moves the slider 7 as described above, the control unit 30 responds to this time based on the current time output from the time counter 12. When the correction value to be calculated is read from the X-axis correction data memory 18, the target position data corresponding to that time is similarly read from the X-axis data memory 13, and the correction value is added to this target position data to correct it. Based on the corrected target position data, the X-axis motor 6 is driven via the X-axis servo amplifier 14 as described above.

Therefore, in such a data correction device, the target position data of the slider 7, which is set in advance for the time output by the time counter 12, is repeatedly corrected based on the operation of the cam 1, and the corrected target position data is location data
Therefore, by controlling the X-axis motor 6, the operation of the grindstone 4 can be corrected to match the operation of the cam 1.
The relative positional relationship between the cam 1 and the grindstone 4 can be corrected.

The data correction device configured as described above corrects the operation of the slider 7 with respect to the operation of the cam 1 based on the flowchart shown in FIG.

When the control unit 30 receives a signal to start machining from the external control device 10, it turns on the time counter 12 and sets the target position data of the cam 1 and the slider 7 corresponding to the time output by the time counter 12, respectively. Data memory 1
From 3.19 onwards, X-axis correction data memory 1
Similarly, from step 8, the correction value corresponding to that time is manually input (step 1).

Then, the control unit 30 adds this correction value to the target position data of the slider 7 to correct it, and also controls the X-axis motor 6 and the C-axis based on the corrected target position data and the target position data of the cam 1. By calculating the rotation amount of the motor 2 and outputting these rotation amounts to the X-axis servo amplifier 14 and the C-axis servo amplifier 20, respectively, the X-axis motor 6
Then, the C-axis motor 2 is driven to move the slider 7 and the cam 1 to the target positions corresponding to the respective target position data (step 2).

Then, the correction unit 31 inputs the current position data of the slider 7 and the cam 1 via the X-axis PG 15, the X-axis position counter 16, the CIdlPG 21, and the C-axis position counter 22. A time corresponding to target position data corresponding to position data is detected (step 4).

Then, the correction unit 31 inputs the target position data of the slider 7 corresponding to the detected time from the X-axis data memory 13 (step 5), and inputs this target position data and step 3).
The deviation from the current position data of the slider 7 manually operated is determined, and a correction value is calculated by a correction function based on this deviation (step 6).

Further, the correction unit 31 stores the calculated correction value in the X-axis correction data memory 18 in association with the time detected in step 4 (step 7).

Then, the control unit 30 controls each data memory 13.19.
If there is remaining data and the external control device 10 does not manually send a signal to end the machining, return to step 1 and repeatedly operate the X-axis motor 6 and C-axis motor 2 according to the time output by the time counter 12. At the same time, the correction value for the target position data of the slider 7 is stored in the X-axis correction data memory 18. or,
The control unit 30 controls the X-axis motor 6 and the X-axis motor 6 when a signal to end machining is manually input from the external control device 10 or based on all the data set in the X-axis data memory 13 and the C-axis data memory 19. When the C-axis motor 2 is driven, it is determined that the grinding of the cam 1 has been completed, and the time counter 12 is reset to end the process (step 8).
).

Here, how the data correction device of the present invention corrects the movement of the slider 7 based on the movement of the cam 1 will be specifically explained based on the table shown in FIG. 3.

1, =ij IIW, for example, the time output from the time counter 12 is B, the target position data of the cam 1 is 200'', and the target position data of the slider 7 is a value corresponding to 8-open, respectively. In some cases, the control unit 30
Based on these target position data, the rotation angle of cam 1 is set to 200', and the position of slider 7 relative to cam 1 is set to 8'.
The X-axis motor 6 and the C-axis motor 2 are driven so as to set a111. In response to this, the current position data manually input to the correction unit 31 via the respective PCl 3.21 and the respective cryostatic counters 16.22 are as follows: cam 1 is 195';
When the slider 7 has data corresponding to 7.5mo+, the correction unit 31 sets the target position data 71111 of the slider 7 at time A corresponding to cam 1 to 195'',
The deviation of 0.5 mm from 7.5 av+ is converted into a correction value, and this correction value is stored in the X-axis correction data memory 18 in correspondence with time A.

Then, when the next time output from the time counter 12 is A, the control unit 30 sets the target position data of the slider 7 to 7mm + 0.5mm = 7.5au.
The target position data is corrected to correspond to a, and the X-axis motor 6 is driven based on this target position data, and the slider 7 is corrected to move to a position of 7.5 aug with respect to the cam 1.

In this way, by correcting the target position data of the slider 7 based on the target position data of the cam 1, the positional relationship between the cam 1 and the slider 7 is relatively corrected, and the cam shape can be formed accurately. It becomes like this.

In this embodiment, the cam is ground by a grindstone.
C. In the control device of a machine tool, a device that relatively corrects the positional relationship between a slider that moves a grindstone with respect to a cam and a cam is illustrated, but the present invention is not limited to this, and a plurality of operating members that operate in conjunction with each other are illustrated. Of course, it can be applied to anything that requires correction of the positional relationship between them.

(Effects of the Invention) According to the above theory 4, the present invention has the following effects.

The correction means detects target position data corresponding to the current position data of the reference actuating member, and detects target position data of other actuating members corresponding to this target position data and current position data of the other actuating members. When the feedback control means performs feedback control of actuating means other than the actuating means that actuates the reference actuating member, it manually inputs the corresponding deviation from the correcting means and changes the target position data to this deviation. Since feedback control is performed while correcting based on the reference, the reference actuating member operates based on the preset target position data, and the other actuating members operate while correcting deviations from that operation. The motions of the reference actuating member and the other actuating members are relatively corrected, and desired operations can be reliably performed.

Further, there is no need to correct the operation of the reference actuating member, which not only simplifies control, but also eliminates the need for storage means for storing values to be corrected, which is economical.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a data correction device according to the present invention, FIG. 2 is an operation flowchart of the data correction device according to the present invention, and FIG. 3 is a specific example of the operation of the data correction device according to the present invention. FIG. 4, FIG. 5, and FIG. 6 are explanatory diagrams of a conventional control device for an NC machine tool Kaede. 1... Cam (operating member), 2... C-axis motor (operating means), 4... Grindstone, 6... X-axis motor (operating means), 7... Slider (operating member), 12... Time counter (feedback control means),
13...X-axis data memory (storage means), 14...
X-axis servo amplifier (feedback control means), 15...XIdlPG (feedback control means),
16...X-axis position counter (feedback control means), 18...X-axis correction data memory (correction means), 19.
...C-axis data memory (storage means), 20...C-axis servo amplifier (feedback control means), 21...C? dlPG (feedback control means),
22... C-axis position counter (feedback control means), 30... control section (feedback control means), 31.
...Correction unit (correction means). Figure 2

Claims (1)

[Claims] Respective actuating means for actuating each actuating member that requires a related action; storage means for storing target position data set in advance for causing each actuating member to perform the action; and said memory. Feedback control means for feedback controlling each of the actuation means based on target position data stored in the means, and current position data of the respective actuation members fed back by the feedback control means, which serves as a reference. detecting the target position data of the actuating member corresponding to the current position data of the actuating member, and detecting the target position data of each of the other actuating members corresponding to the target position data;
A data correction device characterized in that the data correction device comprises a correction device that corrects each deviation based on a deviation that occurs when the feedback control device feedback-controls the actuation device that actuates the other actuation member.