JP3227877B2 - Wheel repair device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone correcting device,
In particular, the present invention relates to a grindstone correction device that enables an operation check of a sensor that detects contact between a grindstone and a grindstone correction tool at the time of forming a grindstone when adjusting the shape and dimensions of a new grindstone.

[0002]

2. Description of the Related Art In a grinding machine, when a grinding wheel is replaced with a new grinding wheel, a grinding wheel is formed (corrected) by cutting with a diamond tool to adjust the shape and dimensions of the grinding wheel. In this case, since the surface of the new grinding wheel has a shape and dimensional error of ± several millimeters, moving the truer along the surface of the grinding wheel while in contact with the surface of the grinding wheel may damage the truer and the grinding wheel. There is.

[0003] Therefore, the truer is cut and advanced to a position where the truer does not come into contact with the surface of the grindstone, and the cut is gradually applied from this position, whereby dressing is repeated until the surface of the grindstone is adjusted to a regular shape. When these series of operations are performed manually, the advance position of the truer with respect to the grindstone surface, and adjustment of the contact adjustment between the truer and the grindstone surface become troublesome, and as a result, it takes several hours to form a new grindstone wheel. There is.

Therefore, recently, the contact between the truer and the grindstone is detected by using a contact detector such as an AE sensor, and a grindstone correcting device is activated by this detection signal to automatically form a new grindstone wheel. Has become.

[0005]

By the way, in a grinding machine for grinding a workpiece, when the diameter of a grinding wheel becomes a minimum diameter (use limit), the grinding wheel is replaced with a new grinding wheel. Six months. Therefore, the automatic grinding wheel forming system operates only once every several months to half a year. An AE sensor that senses a high-frequency vibration level generated by the contact between the truer and the grinding wheel surface is used as the contact detector used under such use conditions. The indirect detection of the contact between the AE sensor and the grinding wheel is not performed, and there is no guarantee that the AE sensor that has not been operated for a long period of time works normally and reliably at the time of forming the grinding wheel.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and checks the normality and abnormality of a grinding wheel contact detector on a daily basis to improve the reliability of operation during grinding of a grinding wheel which is used less frequently. It is an object to provide a correction device.

[0007]

According to the first aspect of the present invention, there is provided a grinding wheel correcting tool for correcting a grinding surface of a grinding wheel, a driving means for relatively moving the grinding wheel correcting tool in a direction of coming and going from the grinding wheel, When the grinding wheel is in contact with the grinding wheel
A contact detection unit that outputs an input signal, and when the grinding wheel is corrected, the grinding wheel correction tool is advanced to a predetermined position, and the driving unit is controlled so as to be cut forward from the position.
When the grinding wheel molding after the grinding wheel replacement to advance the grinding wheel correction tool to the position on <br/> signal from the contact detecting means is output, or a position on signal is output from the contact detection means <br / > et al. in the grindstone correction device and a control means for controlling said drive means so as to cut advanced, when the grindstone corrector
The output of the contact detection means changes from an off signal to an on signal.
Signal is turned on when the grinding wheel correction tool and the grinding wheel
Also holding means for holding after the holding means grindstone before modification
Reset means for resetting the contact signal and whether the contact detection means held by the holding means holds an ON signal.
The grinding wheel correction is started and the grinding wheel correction tool and grinding wheel come into contact
The holding means is turned off.
If the contact detection means is normal when the
Output when the ON signal is not held.
Determining means for outputting a determination result that the touch detection means is abnormal ; The invention of claim 2 is
In the grinding wheel correction device according to claim 1, the determination unit includes:
The contact detection means held by the holding means holds the ON signal.
Is determined after completion of the grinding wheel correction.
When the contact detection means is
Output a judgment result indicating that the
When the contact detection means is not present, the judgment result is output as abnormal.
It is characterized by that. The invention of claim 3 is claim 1 or
Is output from the determination means in the grinding wheel repair device described in 2.
Stops whetstone forming operation when the applied judgment result is abnormal
A stopping means for stopping the operation.

[0008]

According to the present invention, a holding hand is provided by the structure described in claim 1.
Means for determining the output state of the contact detection means held in the step
Normal or abnormal contact detection means
Operation during whetstone molding, which can be checked infrequently and is rarely used
Reliability is improved. Also, it is configured as in claim 2.
As a result, the grinding wheel stops operating
The operator can check for normal and abnormal conditions when
Never overlook the results. Further as in claim 3
With this configuration, when the contact detection means is abnormal, the grinding wheel
The operation can be stopped reliably.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an entire grinding machine including a control unit, provided with a grindstone correcting device according to the present invention. In FIG.
Reference numeral 10 denotes a grinding machine having a bed 11. Bed 11
Above, a work table 12 is installed so as to be movable in the Z-axis direction. The workpiece table 12 includes a servomotor 13 installed on the bed 11 and the servomotor 13.
Is moved in the Z-axis direction by a feed screw (not shown) rotated by the motor. Further, the servo motor 13 is provided with an encoder 14 for detecting a moving amount of the workpiece table 12 based on the rotation amount.
Is provided.

On the workpiece table 12, a headstock 15 and a tailstock 16 with a built-in spindle drive motor are installed at predetermined intervals in the Z-axis direction.
6, both ends of the workpiece W are supported by a chuck 15 b provided on the spindle 15 a of the headstock 15 and a center 16 a of the tailstock 16.

In FIG. 1, reference numeral 17 denotes a grindstone table mounted on the bed 11 so as to be movable in the X-axis direction perpendicular to the direction of movement of the work table 12, and the grindstone table 17 is provided with a servo provided on the bed 11. It is moved in the X-axis direction by a motor 18 and a feed screw (not shown) rotated by the servomotor 18. The servo motor 18 includes an encoder 19 that detects the amount of movement of the grindstone table 17 from the amount of rotation. The grindstone table 17 includes a grindstone wheel 21 attached to a grindstone shaft 20 parallel to the X axis (the rotation axis of the workpiece W), and a drive motor 22 for rotating the grindstone wheel 21.

In FIG. 1, reference numeral 23 denotes a grindstone correction device installed on the grindstone table 17 so as to face the grindstone wheel 21. The grinding wheel correction device 23 includes a diamond rotary truer 24 rotated by a drive motor 24a, a servomotor 25 for moving the truer 24 in a direction (V direction) perpendicular to the rotation axis of the grinding wheel 21, and a grinding wheel 24 for the grinding wheel. A servo motor 26 is provided for moving in a direction (W direction) parallel to the rotation axis of the vehicle 21. The grinding wheel correction device 23 has an AE for detecting that the truer 24 has contacted the surface of the grinding wheel 21.
(Acoustic emission) A contact detector 27 such as a sensor is provided.

Each of the servo motors 25 and 26 has an encoder (not shown) for detecting the amount of movement in the V and W directions from the amount of rotation, and the amount of movement data detected by each encoder will be described later. This is fed back to the numerical controller 30.

The numerical control device 30 controls the grinding machine 10 and the grindstone correcting device 23, and has a central processing unit (hereinafter abbreviated as CPU) 31, which controls and manages the entire grinding machine 10 and the grindstone correcting device 23. And a storage device 32.

As shown in FIG. 2, the storage device 32 has a grinding program for grinding the workpiece W, a grinding wheel automatic forming program for forming a new grinding wheel 21, and a program for re-grinding the grinding wheel 21. Grinding wheel correction program, grinding wheel diameter data for each forming and correction, grinding number data from the start of grinding to be ground by the same grinding wheel 21, minimum grinding wheel diameter data indicating the use limit of the grinding wheel 21, correction grinding number of the grinding wheel 21 Data and the like are stored.

The CPU 31 is connected to an amplifier 40 for outputting a signal kept on or off in accordance with the output state of the contact detector 27. The output signal of the amplifier 40 is C
It is input to PU31. Further, a servo motor 13 for the workpiece table and a servo motor 18 for the grindstone table are connected to the CPU 31 via drive circuits 41 and 42, and each movement detected by the encoders 14 and 19 of these servo motors. The amount data is input to the CPU 31.
Servo motors 25 and 26 of the grindstone correction device 23 are connected to the CPU 31 via respective drive circuits 43 and 44, and an input device 33 is connected to the CPU 31.

The input device 33 includes a display unit 33 a such as a CRT for displaying a whetstone exchange message and the like, a power button 33.
b, a grinding machine stop button 33c, a grinding button 33d for starting grinding, a button 33e for starting grinding wheel automatic forming, and the like.

[0018] In the configuration of the above embodiment, the servo motor 25 and of the grinding wheel repairing apparatus 23 driving means, the contact detector 27 and the amplifier 40 to the contact detection known means, amplifier
Reference numeral 40 denotes a holding unit, and the CPU 31 and the storage device 32 each constitute a control unit , a determination unit, and a stop unit .

Next, the operation of the present embodiment configured as described above will be described. First, a schematic operation when grinding a workpiece will be described based on a flowchart shown in FIG. When the CPU 31 starts executing the grinding program, first, the current grinding number data and the grinding wheel correction grinding number data stored in the storage device 32 are stored in the CPU 3.
By comparing in step 1, it is determined whether a predetermined number of grindings have been performed, that is, whether the workpiece W has been ground up to the number of grinding stones for which the grinding wheel has been corrected (step S1). Here, when it is determined that the current grinding number of the workpiece has not reached the predetermined number, the process proceeds to step S2, and when it is determined that the grinding number of the workpiece W has reached the predetermined number, step S3 is determined. Then, the whetstone correction program is executed. Details of the grinding wheel correction program will be described later.

In step S2, it is determined whether or not the grinding wheel 21 is at the use limit by comparing the current grindstone diameter data stored in the storage device 32 with the minimum grindstone diameter data representing the use limit. Here, when it is determined that the grinding wheel 21 has not reached the use limit, the process proceeds to step S4,
According to a preset grinding program, the grindstone table 17 is cut forward and the workpiece W is ground.
When it is determined that the grinding wheel 21 is at the usage limit, the process proceeds to step S5, and the grinding wheel exchange message is input to the input device 3.
3 is displayed on the display unit 33a.

When the processing of the workpiece W is completed, the completed workpiece W is removed from the headstock 15 and the tailstock 16,
An unprocessed workpiece is newly set. After setting the workpiece, the grinding program is restarted by pressing the grinding button 33d, and the processing shown in FIG. 3 is executed.

Next, the correcting operation of the grinding wheel will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 4 is a flowchart showing the operation procedure of the grinding wheel correction.
The process is started after a predetermined number of workpieces W have been ground. When the grindstone fix is started, CPU 31 gives a truer fast forward advance command to the drive circuit 43, thereby by rotating the servo motor 25, the truer 24 shown in FIG. 5 (M-R ₁₎ only by fast forward advance (step S1
1).

In FIG. 5, M is the distance between the rotation center axis L of the grinding wheel 21 and the retracted end (origin) 0 of the truer 24, and R ₁ and R ₂ are the diameters of the grinding wheel 21. Where R ₁
Is the current size before correction grinding wheel, R ₂ is the diameter of the grinding wheel 21 after the correction that cut only S.

Next, a cut command is given from the CPU 31 to the drive circuit 43 and the servomotor 25 is rotated to advance the truer 24 by the cut command S (step S12).

[0025] In the next step S13, the radius R of the grinding wheel 21, and updating the R = R _2. Thereafter, the CPU 31 gives a leftward movement command to the drive circuit 44 to rotate the servomotor 26, thereby causing the truer 24 to move leftward (step S14). Thereby, the large diameter portion 21a of the grinding wheel 21 is corrected.

In the next step S15, when the correction of the large-diameter portion 21a has been completed, the CPU 31 gives a forward command to the drive circuit 43 to rotate the servomotor 25, so that the truer 24 is reduced by the amount T shown in FIG. (Step difference between the large diameter portion 21a and the middle diameter portion 21b). After a while, CP
By giving a leftward instruction to the drive circuit 44 from U31 and rotating the servomotor 26, the truer 24 is advanced leftward (step S16), and the middle diameter portion 21b of the grinding wheel 21 is corrected.

In the next step S17, when the correction of the middle diameter portion 21b is completed, the CPU 31 issues a forward command to the drive circuit 43 to rotate the servomotor 25, thereby reducing the truer 24 to the amount U shown in FIG. (The step difference between the middle diameter portion 21b and the small diameter portion 21c). Then the CPU
By giving a leftward movement command from 31 to the drive circuit 44 and rotating the servomotor 26, the truer 24 is moved leftward (step S18), and the small diameter portion 21c of the grinding wheel 21 is corrected.

When the correction of the small diameter portion 21c is completed, the CPU
By giving a fast forward retreat command to the servo motor 25 from 31, the servo motor 25 is rotated to move the truer 24 fast forward by (M−R ₂ + T + U) shown in FIG. 5 (step S 23). Thereafter, a rightward command is given from the CPU 31 to the servomotor 26 to rotate the servomotor 26 to return the truer 24 to the standby position shown in FIG. 5 (step S20).

In the above description, the whetstone repair program for performing the S incision only once has been described, but steps S12 to S20 shown in FIG. 4 may be repeated.

Next, an operation check of the contact detector 27 will be described with reference to a flowchart shown in FIG. As described in FIG. 3, when the grinding wheel correction for the grinding wheel 21 is determined, the program shown in FIG. 6 starts. Accordingly, the CPU 31 resets the output signal from the amplifier 40 to OFF by applying a reset signal to the amplifier 40 (step S31). Then, in step S32, it is determined whether the output signal from the reset amplifier 40 is off.

Here, when it is determined that the amplifier 40 is normal and the output signal after the reset is off, the process proceeds to a grinding wheel correction process shown in step S34. When the truer 24 and the grinding wheel 21 come into contact with each other during the grinding wheel correction, a signal of a certain level or more is sent from the contact detector 27 to the amplifier 40, and the output signal of the amplifier 40 changes from off to on,
After the grinding wheel correction is completed, the output signal from the amplifier 40 is kept on even if the truer 24 and the grinding wheel 21 are separated. If it is determined that the output signal of the amplifier 40 is not turned off even after resetting, it is determined that the amplifier 40 has an abnormality, and data indicating this is stored in a predetermined memory area of the storage device 32 in the ME. = 1 (step S33).

In the next step S35, it is determined whether the contact detector 27 and the amplifier 40 operate normally when the grinding wheel 21 is corrected. Here, when the output signal of the amplifier 40 is ON, it is determined that the contact detector 27 and the amplifier 40 are normal, and the process proceeds to step S37. If the output signal of the amplifier 40 is not on, the contact detector 27 and the amplifier 40 are determined to be abnormal, and the process proceeds to step S36, where the contact detector 27 and the amplifier 40 are stored in a predetermined memory area of the storage device 32. Data ME = 1 indicating an abnormality is stored.

In the next step S37, the contact detector 27
Is determined. That is, when the check status data stored in the predetermined memory area of the storage device 32 is ME = 0, it is determined that the contact detector 27 is normal. When the check status data is not ME = 0, the contact detector 27 is not in contact. When it is determined that there is an abnormality in the detector 27, the process proceeds to step S38, and a predetermined alarm process is performed.

For example, a message indicating that the contact detector 27 is abnormal is displayed on the display unit 33a of the input device 33.
Then, once the alarm is displayed, the alarm is stored in the memory and held until the contact detector 27 becomes normal.

Next, the operation of forming a new wheel after replacement with a grinding wheel will be described with reference to the flowchart shown in FIG. If the operator visually recognizes that the grinding wheel exchange message is displayed on the display unit 33a, the grinding wheel 21 which has reached the usage limit is replaced with a new grinding wheel, and then the grinding wheel automatic forming button 33e is pressed, and the grinding wheel automatic forming is performed. Start the program.

When the grinding wheel automatic forming program is started, first, in step S41, it is determined whether the check status data of the contact detector 27 stored in a predetermined memory area of the storage device 32 is ME = 1. Where M
If E = 1 is not satisfied, it is determined that the contact detector 27 is normal, and the automatic grindstone forming process is executed (step S42).
This whetstone forming process will be described later.

On the other hand, in step S41, ME = 1
When it is determined that there is an abnormality in the contact detector 27,
In step S43, the grinding machine is brought to an emergency stop.

Next, the forming operation of the grinding wheel will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 8 is a flowchart showing the operation procedure of the grinding wheel forming.
It is started when the grinding wheel 12 is replaced. When the grinding wheel forming program is started, the CPU 31 gives a truer fast-forward advance command to the drive circuit 43, and thereby rotates the servomotor 25, so that the truer 24 is shown in FIG.
R ₀ -P) only to fast-forward forward (step S51).

[0039] Note that in FIG. 9, M is the distance to the retracted end (origin) 0 of the rotation center axis L and truer 24 of grinding wheel 21, the diameter of R ₀ is before forming the grinding wheel 21, P is the truer 24 This is the feed amount from the rapid traverse advance end to contact with the grinding wheel 21.

When the truer 24 is advanced in the fast-forward direction, the servo motor 25 is rotated by giving a contact feed command from the CPU 31 to the drive circuit 43 in step S52, and the truer 24 is contact-fed. Thereafter, the truer 24 detects the contact detection knowledge 27 the acoustic wave generated upon contact with the grinding wheel surface, determines whether there is contact signal from the contact detector 27 with CPU 31 (step S53).
Here, if there contact signal is determined, the diameter R ₁ of the CPU31 the grinding wheel 21, and updates process R ₁ obtained by the signal from the encoder 19 (step S54).

Next, a rightward command is given from the CPU 31 to the drive circuit 43 to rotate the servomotor 26 to move the truer 24 rightward from the contact feed position by a predetermined amount as shown in FIG. 9 (step S55). After a while
By giving a cutting command from the CPU 31 to the drive circuit 43 and rotating the servomotor 25, the truer 24 is advanced by the cutting command S1 (step S56).

In the next step S 17, the diameter R ₁ of the grinding wheel 21 is determined by R ₂ obtained from the signal of the encoder 19.
Update processing. After that, the drive circuit 44
Is given to the left, and the truer 24 is caused to move leftward by rotating the servomotor 26 (step S58). Thereby, the large diameter portion 21a of the grinding wheel 21 is formed.

In the next step S59, when the molding of the large-diameter portion 21a is completed, the CPU 31 gives the drive circuit 43 a forward command to rotate the servomotor 25, thereby reducing the truer 24 to the amount T shown in FIG. (The step difference between the large diameter portion 21a and the middle diameter portion 21b). After a while, CPU
By sending a leftward command from the drive circuit 31 to the drive circuit 44 and rotating the servomotor 26, the truer 24 is moved leftward (step S60), and the medium diameter portion 21b of the grinding wheel 21 is formed.

In the next step S61, when the forming of the middle diameter portion 21b is completed, the CPU 31 gives a forward command to the drive circuit 43 to rotate the servomotor 25, thereby reducing the truer 24 to the amount U shown in FIG. (The step difference between the middle diameter portion 21b and the small diameter portion 21c). After that, CPU3
1 to the drive circuit 44 to give a leftward movement command,
By rotating the wheel 6, the truer 24 is moved leftward (step S62), and the small diameter portion 21c of the grinding wheel 21 is formed.

When the molding of the small diameter portion 21c is completed, the CPU
By giving a fast forward retreat command to the servo motor 25 from 31, the servo motor 25 is rotated and the truer 24 is fast forward retracted by (M−R ₂ + T + U) shown in FIG. 9 (step S 63). Thereafter, a rightward command is given from the CPU 31 to the servo motor 26 to rotate the servo motor 26 to return the truer 24 to the standby position shown in FIG. 9 (step S64).

In the above description, the cut of S1 is 1
Fig. 8
May be repeated.

As described above, in the present embodiment, the output state of the amplifier 40 of the contact detector 27 when the truer 24 comes into contact with the grinding wheel 21 when the grinding wheel 21 is corrected is held, and is replaced. When the new grinding wheel 21 is automatically formed, the amplifier 4 of the held contact detector 27 is used.
When the output state of 0 is ON, it is determined to be normal, and when it is OFF, it is determined to be abnormal. When it is determined to be abnormal, the fact is displayed on the display unit 33a, and the grinding machine is emergency stopped. With this configuration, when the contact detector 27 is abnormal, the forming operation for the new replacement grinding wheel is not performed indiscriminately, and the reliability of the operation at the time of forming the grinding wheel that is used less frequently can be improved. Further, at the time of grinding wheel correction, it is only necessary to check the output state of the contact detector, and if an abnormality occurs, it is only necessary to display an alarm.

The present invention is not limited to the configuration shown in the above embodiment, and various modifications can be made without departing from the scope described in claims.

[0049]

As described above, according to the present invention, the output state of the contact detecting means held by the holding means is judged by the judging means to determine whether the contact detecting means is normal or abnormal. The reliability of the operation at the time of forming a grindstone which is not frequently used can be improved. Claims
With the configuration as shown in FIG. 2, when the grinding wheel correction is completed and the grinding machine stops operating, it is possible to check whether the operation is normal or abnormal, so that the operator does not overlook the determination result. Further, according to the configuration of claim 3, there is an effect that the operation of the grinding wheel forming can be surely stopped when the contact detection means is abnormal.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a grinding machine to which a grindstone correcting device according to the present invention is applied.

FIG. 2 is an explanatory diagram illustrating an example of storage contents in a storage device according to the present embodiment.

FIG. 3 is a flowchart illustrating an outline of a grinding processing procedure according to the embodiment.

FIG. 4 is a flowchart illustrating a procedure of a grindstone correction process in the embodiment.

FIG. 5 is an explanatory diagram showing a correction operation state of the grinding wheel in the embodiment.

FIG. 6 is a flowchart showing a procedure for detecting a contact detection signal at the time of grinding wheel correction in the embodiment.

FIG. 7 is a flowchart illustrating an operation of forming a grindstone in the present embodiment.

FIG. 8 is a flowchart showing a procedure of a grinding stone forming process in the embodiment.

FIG. 9 is an explanatory diagram showing a forming operation state of the grinding wheel in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Grinding machine 17 Grinding wheel stand 18 Servo motor 21 Grinding wheel 23 Grinding wheel correction device 24 Truer (Grinding wheel correction tool) 25, 26 Servo motor (Drive means) 30 Numerical control device (Control means, Judgment means, Stop means ) 31 CPU (Reset ) Means) 32 storage device 33 input device 40 amplifier (holding means)

Claims (3)

(57) [Claims] 1. A grinding wheel correcting tool for correcting a grinding surface of a grinding wheel, driving means for relatively moving the grinding wheel correcting tool in a direction of coming and going from the grinding wheel, and when the grinding wheel correcting tool contacts the grinding wheel. A contact detection unit that outputs an ON signal, and when the grinding wheel is corrected, the grinding wheel correction tool is advanced to a predetermined position, and the driving unit is controlled so as to be cut forward from the position. At the time, the grinding wheel correction tool is advanced to a position where an ON signal is output from the contact detection means, and an ON signal is output from the contact detection means.
In grindstone corrector and a control means for controlling said drive means so as to be cut advances from the output position, the output of the contact sensing means when the grindstone correction is OFF signal
When the signal changes from ON to ON, the ON signal is modified to the grinding wheel.
Also holding means for holding after leaving the tool and the grinding wheel, the coercive
Reset means for resetting the holding means before the grinding wheel is corrected, and contact detection means held by the holding means hold the ON signal
Whether the grinding wheel correction is started and the grinding wheel correction
Judgment is made after the tool and grinding wheel come into contact with each other.
When the holding means holds the ON signal,
Outputs the judgment result that the informing means is normal, and outputs the ON signal.
Judgment that the contact detection means is abnormal when not holding
A grinding wheel correcting device comprising: a determination unit that outputs a result . 2. The information processing apparatus according to claim 1, wherein the determination unit is configured to be held by the holding unit.
To determine whether the contact detection means
The judgment is made after the stone correction is completed, and the holding means holds the ON signal.
Judgment result that the contact detection means is normal when holding
Output, and when the ON signal is not held, the contact detection means
Output a determination result that the device is abnormal.
The grinding wheel repair device according to claim 1. 3. The determination result output from the determination means is
Equipped with stop means to stop the operation during grinding when abnormal
3. The grinding wheel correction contact according to claim 1 or 2,
Place.