JP2002066921A - Correction method of grinding wheel and correction device of grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a correction method of grinding wheel capable of carrying out certain automatic correction machining with a high accuracy, spending no labor and being applied to an already existing correction device of grinding wheel at low cost. SOLUTION: In the correction method of grinding wheel, a grinding material is rotated by a motor and contacts a grinding wheel while the grinding material is moved to a predetermined position (S20, 32) and a grinding wheel surface is ground by the grinding material to correct it. A threshold power for previously judging (S16, 26, 36) a contact state of the grinding material and the grinding wheel is determined from a consumption power value of the motor at the time of non-contact of the grinding material and the grinding wheel and a time required for the correction of the grinding wheel surface is presumed from a length to be moved and a predetermined speed of the grinding material previously contacted with the grinding wheel. A time at which the consumption power value of the motor is larger than the threshold power (S26) is integrated (S30) during when the grinding material is moved to a predetermined position (S20, 32). The integration time is compared with a required time (S40) and when the integration time is smaller, the correction of the grinding wheel surface is repeated. When both times are equal, the correction of the grinding wheel surface is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of rotating a grinding material such as a diamond grinding wheel (hard grinding wheel) or a grindstone by a motor, and bringing the grinding material into contact with the grinding material while moving the grinding material to a predetermined position. Method of dressing by grinding the surface of the grindstone (dressing), by rotating the grindstone or grindstone, bringing the grindstone into contact with the grindstone while moving the grindstone to a predetermined position, and grinding the surface of the grindstone with the grindstone A method for correcting a grinding wheel to be corrected, a grinding material or a grinding wheel being rotated by a motor, a grinding material being brought into contact with a grinding material while moving the grinding material to a predetermined position, and a grinding wheel correcting device for grinding and repairing the surface of the grinding wheel with the grinding material. The present invention relates to a grindstone repairing device for rotating a grindstone or a grindstone by a motor, bringing the grindstone into contact with the grindstone while moving the grindstone to a predetermined position, and grinding and modifying the surface of the grindstone with the grindstone. It is intended.

[0002]

2. Description of the Related Art A general metal cutting machine tool uses a metal cutting tool having a high hardness, while a grinding machine uses a grindstone as a tool. The hardness of the abrasive grains of the whetstone is significantly higher than the hardness of any metallic cutting tool, and can cut hard materials such as hardened steel at a high cutting speed. In the grinding machine, since each abrasive grain hitting one blade scrapes a cutting object in a minute state, it is possible to finish fine surface roughness and finish fine dimensions.

[0003] Generally, a grinding stone obtained by sintering abrasive grains has a disk shape or a cup shape, and is used by rotating at a high speed.
Abrasive grains used for grinding may wear, fall off, or become clogged, resulting in poor sharpness or a loss of peripheral shape of the grindstone. For this reason, the surface of the grinding wheel is shaped (truin
g) and dressing corrections need to be made.

Conventionally, as a method of correcting a grindstone, there are a method of performing manual processing depending on the visual and auditory senses of an operator, a method of performing automatic processing by position detection using a mechanical or optical sensor, and Japanese Patent Application Laid-Open No. 10-329021. No.
A method of performing automatic machining by detecting the contact between a cutting wheel and a diamond wheel using an AE sensor (Acoustic Emission Sensor; detector of radiation sound), and the pressing force of a diamond wheel disclosed in Japanese Utility Model Publication No. 7-35729. There is a method of detecting the contact between the cutting wheel and the diamond wheel based on the measured value, and performing automatic machining.

[0005] Another method of correcting a grinding wheel is to detect a current flowing through a motor for driving a cutting wheel or a motor for driving a diamond wheel, and to detect contact between the cutting wheel and the diamond wheel based on the detected value. , A method of performing automatic machining, and a power consumption value of a grindstone shaft motor at the time of entering a first-piece grinding process disclosed in Japanese Patent Application Laid-Open No. 7-205032, and the power consumption before dressing stored in advance is stored. Compared to the power value, when the detected value is larger than the stored value,
There is a method of continuing the grinding process assuming that the dressing is normally performed.

[0006]

Among the above-mentioned methods of repairing a grindstone, the method of manual processing is a delicate processing, so that skilled skills are required, the number of workers is limited, and visual and auditory senses are reduced. To rely on the operator, the head must be close to the machined part, which is always dangerous, and because the standard of completion of machining is ambiguous, it is easy to cut the grinding wheel more than necessary, causing waste, etc. There is a problem.

In the method of performing automatic processing by position detection using a sensor, since there are many types of cutting grindstones whose surfaces are to be corrected and their diameters are different from each other, position detection by a machine (for example, position detection of a feed arm) requires The condition of contact between the cutting wheel and diamond wheel and the processing condition of the cutting wheel cannot be determined, and the diameter of the cutting wheel and diamond wheel decreases each time they are used. There is a problem that it is not possible to judge the machining status of the workpiece.

In the method of performing automatic machining by detecting the contact between the cutting wheel and the diamond wheel using an AE sensor, an AE sensor is used.
Cutting powder and cutting fluid are applied to the sensor, making it impossible to perform reproducible contact detection. AE sensor shortens its life due to cutting powder and cutting fluid. The contact sound between the cutting wheel and diamond wheel is delicate. Therefore, there is a problem that contact detection with reproducibility cannot be performed due to the influence of an external sound, and maintenance work such as cleaning and mounting of the AE sensor is required.

In the method of performing automatic machining by detecting the contact between the cutting wheel and the diamond wheel based on the measured value of the pressing force of the diamond wheel, it is necessary to incorporate a strain sensor or the like into the feed force transmission system of the diamond wheel. Since the structure becomes complicated and the equipment cost rises, it is difficult to incorporate a strain sensor into existing equipment, and the output signal of the strain sensor is very small, an amplifier is required. There are problems such as the necessity of a work of calibrating in a dynamic manner and an increase in equipment cost due to the distortion sensor and the amplifier.

In a method of detecting current flowing in a motor for driving a cutting grindstone or a diamond grindstone, detecting contact between the cutting grindstone and the diamond grindstone based on the detected value, and performing automatic machining, the state in which the grindstone is not in contact is detected. In FIG. 10C, since the motor load is light, the change in the motor current is small with respect to the change in the motor load in this region, and the contact cannot be detected with high sensitivity.
Also, when the motor load is small, the ratio of the exciting current proportional to the motor voltage is large,
As shown in (1), there is a problem that the influence of the motor voltage fluctuation is large and the contact cannot be detected with high sensitivity.

The present invention has been made in view of the above-described circumstances. According to the first invention, it is possible to perform an accurate and highly accurate automatic correction process, prevent excessive grinding, and save time and effort. It is another object of the present invention to provide a method for repairing a grindstone that can be applied to an existing grindstone repair apparatus at low cost. In the second invention, an object of the present invention is to provide a whetstone correction device capable of performing reliable automatic processing with high accuracy, preventing excessive grinding, reducing labor, and realizing at low cost. .

[0012]

According to a first aspect of the present invention, there is provided a method of repairing a grinding wheel, wherein a grinding material or a grinding wheel is rotated by a motor, and the grinding material or the grinding wheel is brought into contact with the grinding material or the grinding wheel while moving the grinding material or the grinding wheel to a predetermined position. A method of repairing a grinding wheel that grinds and repairs the surface of the grinding wheel with the grinding material, wherein the grinding material and the grinding wheel are in contact with each other based on a power consumption value of the motor before the grinding material and the grinding wheel are not in contact with each other. Determine the threshold power for determining whether or not to do, based on the length in which the grinding material and the grindstone should be in contact with the grinding material and the grindstone in advance, and a predetermined speed at which the grinding material or the grindstone moves Estimating the time required for correcting the surface, integrating the time during which the power consumption value of the motor is greater than the threshold power during the movement of the abrasive or the grindstone to the predetermined position, necessary Comparing the time, when the time obtained by accumulating is smaller than the required time said repeatedly modification of the surface, when the same cumulative amount of time and the time required,
The modification of the surface is terminated.

[0013] The grindstone correcting apparatus according to the second invention is such that the grinding material or the grindstone is rotated by a motor, and the grinding material or the grindstone is brought into contact with the grinding material or the grindstone while being moved to a predetermined position. In a grindstone repairing device for grinding and repairing the surface of a grindstone, a means for detecting a power consumption value of the motor, a threshold power for determining whether the grinding material and the grindstone are in contact with each other, and the surface Means for storing the estimated time required for correction, and means for comparing the magnitude of the power consumption value and the threshold power while moving the abrasive or the grindstone to the predetermined position, and a comparison result of the means, Means for integrating the time when the power consumption value is larger, and means for comparing the integrated time and the estimated time integrated by the means, and when the comparison result of the means indicates that the integrated time is smaller, Surface modification Again, the comparison result, when the same integration time and the estimated time, characterized in that are no order to end the modification of the surface.

In the method for correcting a grindstone according to the first invention and the device for correcting a grindstone according to the second invention, the grinding material or the grindstone is rotated while the grinding material or the grindstone is moved to a predetermined position by a motor. Then, the surface of the grinding wheel is ground and repaired with an abrasive. The detecting means detects the power consumption value of the motor, and the storing means stores the threshold power for determining whether the abrasive and the grinding wheel are in contact with each other, and the estimated time required for correcting the surface of the grinding wheel. . During the movement of the abrasive or the grindstone to the predetermined position, the comparing means compares the power consumption value and the threshold power, and the integrating means integrates the time during which the comparison result indicates that the power consumption value is larger. The means for comparing the time compares the integrated time and the estimated time required for the correction, and when the comparison result of the means for comparing the time is smaller, the correction of the surface of the grindstone is repeated. When the comparison result indicates that the accumulated time and the estimated time are equal, the correction of the surface of the grinding stone is ended.

In the method and apparatus for repairing a grinding wheel, the power consumption of the motor is used to determine whether or not the grinding material and the grinding wheel are in contact with each other. As shown in FIG. 10E, the contact amount between the abrasive and the grinding wheel can be detected with high sensitivity regardless of the magnitude of the load, as shown in FIG. 10E.

Thus, the method for repairing a grindstone according to the first invention enables reliable and highly accurate automatic repair processing.
It is possible to realize a method of repairing a grindstone that can prevent excessive grinding, does not require much labor, and can be applied at low cost to an existing grindstone repair device. The grindstone repair device according to the second aspect of the present invention can perform reliable and highly accurate automatic repair processing, can prevent excessive grinding, and can realize a grindstone repair device that requires no labor at low cost.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment. FIG. 1 is a schematic diagram schematically showing a configuration of an embodiment of a grindstone repair method and a grindstone repair device according to the present invention. This whetstone repair device is
A disc-shaped diamond grindstone 3 serving as a grinding material for modifying the surface of a polishing grindstone 4; a motor 2 for applying rotational power to a rotating shaft of the diamond grindstone 3 via a belt 5;
, A vertical drive unit (not shown) for driving the diamond grindstone 3 in a direction perpendicular to the rotation axis thereof, and a parallel direction drive (not shown) for driving the diamond grindstone 3 in a direction parallel to the rotation axis. Section.

FIG. 2 is a block diagram showing a configuration example of the control panel 1. The control panel 1 controls the contact level, which is the threshold power for determining whether or not the diamond grindstone 3 and the polishing grindstone 4 are in contact with each other, and the estimated time required for correcting the polishing grindstone surface previously input (required time). Memory 15, which is a means for storing time, etc., a clock circuit 16, a display unit 17 for displaying the drive control of the motor 2, an operation unit 18 including input keys and operation keys, and a motor for driving the motor 2. It includes a drive circuit 12, a power detector 11 for detecting the power consumption of the motor 2, and an information processing unit 10 connected to each of these units and configured by a microcomputer. The information processing unit 10 is also connected to a vertical drive unit 13 that drives the diamond grindstone 3 in a direction perpendicular to its rotation axis, and a parallel direction drive unit 14 that drives the diamond grindstone 3 in a direction parallel to its rotation axis. I have.

The operation of the above-structured grindstone correcting apparatus will be described below with reference to the flowcharts of FIGS. The information processing unit 10 of the control panel 1
When a setting key for setting the contact level of the operation unit 18 is operated (S2), the detected power consumption value of the motor 2 is read from the power detector 11 (S4), and the read power consumption value (detection) is detected. The contact level is calculated by adding the (power value) and the predetermined power value (S6). Next, the information processing section 10 stores the calculated contact level in the memory 15 (S8) and returns.

In order to calculate the contact level, the power consumption of the motor 2 when the diamond wheel 3 and the polishing wheel 4 are not in contact with each other and when there is no load is as shown in FIG. 4A. At the point in time, when the user operates the setting key, it is detected and read. Information processing unit 10
Assumes that the read detected power value is 0% load, and adds a predetermined power value to the read power value to obtain a contact level. As shown in FIG. 4B, when the read detected power value is larger than the contact level, It is determined that the diamond grindstone 3 and the polishing grindstone 4 are in contact with each other and the load operation is being performed. The user may execute this operation regardless of the start delay time of the motor 2 when the motor 2 is rotating without load. In addition, the program may be automatically executed using a timer without depending on the operation of the user. For setting the contact level, a load monitoring device described in Japanese Patent Application Laid-Open No. 7-274383 filed by the present applicant is used.

When the start key of the operation unit 18 is operated (S10), the information processing unit 10
Then, the driving (vertical feed) of the rotating diamond grindstone 3 in the vertical direction of the rotation axis is started (S12).
Next, the information processing unit 10 reads the detected power consumption value (detected power value) of the motor 2 from the power detector 11 (S1).
4) The read detected power value is compared with the contact level stored in the memory 15 (S16). If the detected power value is smaller than the contact level, the detected power of the motor 2 is detected again from the power detector 11. Is read (S14), and the detected detected power value is compared with the contact level stored in the memory 15 (S16).

The information processing section 10 compares the read detected power value with the contact level (S16). If the detected power value is larger than the contact level, it is determined that the diamond grindstone 3 and the polishing grindstone 4 have come into contact with each other. The vertical driving unit 13 stops driving (vertical feed) in the vertical direction (S18), and the parallel driving unit 14 causes the rotating diamond grindstone 3 to rotate.
Of the rotating shaft in the parallel direction (parallel feed) is started (S20), and the timing circuit 16 starts timing (S2).
2).

Next, the information processing section 10 includes a power detector 11
From the detected power consumption value of the motor 2 (S2
4) Comparing the read detected power value with the contact level stored in the memory 15 (S26), and if the detected power value is larger than the contact level, the power detector 11 again outputs the detected motor 2 Is read (S24), and the read power consumption value is compared with the contact level stored in the memory 15 (S26).

The information processing section 10 compares the read detected power value with the contact level (S26). If the detected power value is smaller than the contact level, the diamond grindstone 3 and the polishing grindstone 4 are in contact. If there is no clock, the timer 16 stops the timer (S28), and the time counted up to that point is integrated (S30). After accumulating the time counted up to that time (S30), the information processing section 10 determines whether or not the diamond grindstone 3 has reached a parallel feed end position which is a predetermined position (S32), and reaches the end position. If not, the detected power value of the detected motor 2 is read from the power detector 11 (S34), and the read detected power value is compared with the contact level stored in the memory 15 (S36).

The information processing section 10 compares the detected detected power value (S34) with the contact level (S36). If the detected power value is smaller than the contact level, the diamond grindstone 3 again terminates the parallel feed. It is determined whether the position has been reached (S32). The information processing section 10 compares the read detected power value (S34) with the contact level (S36), and when the detected power value is larger than the contact level, the diamond grindstone 3 and the polishing grindstone 4 come into contact again. As a result, the timer circuit 16 starts time measurement (S22).

This is because, for example, as shown in FIG. 6, the surface to be corrected of the grinding wheel 4 has irregularities, and the diamond grinding wheel 3 and the grinding wheel 4 repeat contact and separation. When the time when the contact signal (a) indicating that the grinding wheel 4 is output is shorter than the estimated time (b) required to correct the surface of the grinding wheel 4, or as shown in FIG. 4. There is a depression on the surface to be corrected, and after the diamond grinding stone 3 and the polishing grinding stone 4 come into contact with each other, the contact is once separated at the depression, so that a contact signal (a) indicating contact is output. This is the case where the estimated time is shorter than the estimated time (b) required to correct the surface of the grinding wheel 4.

The information processing section 10 determines whether or not the diamond grindstone 3 has reached a predetermined position of the parallel feed end position (S32). The parallel direction drive unit 14 returns the diamond grindstone 3 to the start positions in the vertical direction and the parallel direction (S38).

Next, the information processing section 10 compares the accumulated time (S30) accumulated up to that time with the estimated time required for correcting the grinding wheel surface stored in the memory 15 (S4).
0), when the accumulated time is equal to the estimated time, the correction of the surface of the polishing grindstone 4 is terminated and the process returns. This is because, as shown in FIG. 9, after the diamond grindstone 3 and the polishing grindstone 4 come into contact with each other, the contact signal (a) indicating that the diamond grindstone 3 and the grinding grindstone 4 are in contact with each other is output once. This is the case where the estimated time (b) required to correct the surface of the grindstone 4 is equal to the time, and it is determined that the correction of the polishing grindstone 4 is completed.

The information processing unit 10 compares the accumulated time (S30) with the estimated time (S40). If the accumulated time is shorter than the estimated time and is not equal to the estimated time, the accumulated time is reset to 0 (S42), and the vertical The direction drive unit 13 starts driving the rotating diamond grindstone 3 in the vertical direction (vertical feed) of its rotating shaft (S12), and repeats the above-described modification of the surface of the polishing grindstone 4 (S42).

This is in addition to the examples of FIGS. 6 and 7 described above,
As shown in FIG. 8, the circumferential shape of the grinding wheel 4 is not uniform,
After the diamond grindstone 3 and the polishing grindstone 4 once come into contact with each other, the diamond grindstone 3 may reach the end position of the parallel feed in a separated state, and the unevenness and the dent are eliminated, and the circumferential shape becomes uniform. The modification of the surface of the grinding wheel 4 is repeated until it is completed. Therefore, in the method and apparatus for repairing a grindstone according to the present invention, in addition to the unevenness of the surface of the grindstone to be corrected and the irregular shape of the grindstone, as shown in FIGS.
The grindstone can be modified without overlooking the slight depression as shown in FIG.

In this embodiment, the grinding material is rotated by a motor, the grinding material is brought into contact with the grinding material while moving the grinding material to a predetermined position, and the surface of the grinding wheel is repaired by grinding the surface of the grinding wheel with the grinding material. A method and a grinding wheel correction device have been described, but the grinding material is rotated by a motor, the grinding material is brought into contact with the grinding material while moving the grinding wheel to a predetermined position, and the surface of the grinding wheel is corrected by grinding with the grinding material. Method and apparatus for repairing a grinding wheel, a grinding wheel is rotated by a motor, a grinding material is brought into contact with a grinding material while moving the grinding wheel to a predetermined position, and a grinding wheel repair method for grinding and repairing the surface of the grinding wheel with the grinding material and a grinding wheel repair. A grinding wheel is rotated by a device and a motor, the grinding material is brought into contact with the grinding material while moving the grinding material to a predetermined position, and the surface of the grinding stone is ground and repaired with the grinding material. Be positive device, relative movement of the grinding member and the grinding wheel are similar, it is possible to the same thing.

[0032]

According to the method for repairing a grindstone according to the first aspect of the present invention, it is possible to perform reliable and highly accurate automatic repair processing irrespective of the diameter of the grindstone, to prevent excessive grinding, and to save time and effort. The present invention can be applied at a low cost to an existing grindstone repair device. In addition, since the contact / non-contact state of the abrasive and the grindstone can be determined by the ON / OFF signal, it is easy to determine whether the correction is completed. In addition, the whetstone can be corrected without overlooking a slight depression, so that the reliability of whetstone correction can be improved.

According to the whetstone repair device of the second invention,
Irrespective of the diameter of the grindstone, it is possible to perform reliable and highly accurate automatic correction processing, prevent over-grinding, and realize a low-cost grindstone repair device that does not require much labor.
In addition, since the contact / non-contact state of the abrasive and the grindstone can be determined by the ON / OFF signal, it is easy to determine whether the correction is completed. In addition, the whetstone can be corrected without overlooking a slight depression, so that the reliability of whetstone correction can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view schematically showing a configuration of an embodiment of a grindstone repair method and a grindstone repair apparatus according to the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a control panel.

FIG. 3 is a flowchart showing an operation of the grindstone correcting device according to the present invention.

FIG. 4 is a timing chart showing the operation of the grindstone correcting device according to the present invention.

FIG. 5 is a flowchart showing the operation of the grindstone correcting device according to the present invention.

FIG. 6 is a schematic view schematically showing an operation of the grindstone correcting device according to the present invention.

FIG. 7 is a schematic view schematically showing the operation of the grindstone correcting device according to the present invention.

FIG. 8 is a schematic view schematically showing the operation of the grindstone correcting device according to the present invention.

FIG. 9 is a schematic view schematically showing the operation of the grindstone correcting device according to the present invention.

FIG. 10 is a characteristic diagram showing a relationship among current, voltage, power, and load of a motor.

[Description of Signs] 1 control panel 2 motor 3 diamond grindstone (grinding material) 4 polishing grindstone (grindstone) 10 information processing unit 11 power detector 12 motor drive circuit 13 vertical drive unit 14 parallel drive unit 15 memory 16 clocking Circuit 18 Operation unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Atsuhiko Tamaki 4-17-96, Tsurumi-ku, Tsurumi-ku, Osaka-shi, Osaka Inside Tsubakimoto Chain Co., Ltd. (72) Inventor Seiji Miyashita 1 Toyota Town, Toyota-shi, Aichi Prefecture Toyota Auto (72) Inventor Masanori Yanagimoto 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Yukio Yura 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference ) 3C047 AA06 AA13 AA15

Claims (2)

[Claims] 1. A grinding material or a grindstone is rotated by a motor, the grinding material or the grindstone is brought into contact with the grinding material or the grindstone while moving the grindstone or the grindstone to a predetermined position, and the surface of the grindstone is corrected by grinding with the grinding material. In the grinding wheel correction method, based on the power consumption value of the motor in advance when the grinding material and the grinding wheel are not in contact, determine a threshold power for determining whether the grinding material and the grinding wheel are in contact, Estimating the time required to correct the surface based on the length to which the grinding material or the grindstone should move in advance when the grinding material and the grindstone are in contact and the predetermined speed at which the grinding material or the grindstone moves, While moving the material or the grindstone to the predetermined position, the power consumption value of the motor is integrated with the time greater than the threshold power, the integrated time is compared with the required time, and the integrated time is the required time. Yo When small, repeated correction of the surface, when the same cumulative amount of time and the necessary time, the correction method of the grindstone, characterized in that to end the modification of said surface. 2. A method in which a grinding material or a grindstone is rotated by a motor, the grinding material or the grindstone is brought into contact with the grinding material or the grindstone while moving the grindstone or the grindstone to a predetermined position, and the surface of the grindstone is corrected by grinding with the grinding material. In the grindstone correction device, a unit for detecting a power consumption value of the motor, a threshold power for determining whether the grinding material and the grindstone are in contact with each other, and an estimated time required for correcting the surface are stored. Means, and means for comparing the magnitude of the power consumption value and the threshold power while moving the abrasive or the grindstone to the predetermined position, and the comparison result of the means indicates that the power consumption value is larger. Means for integrating, and means for comparing the integrated time accumulated by the means and the estimated time, and when the result of the comparison is smaller, the correction of the surface is repeated, and the comparison result is obtained. But the product Time and time are equal estimated time correction device of the grinding wheel, characterized in that are no order to end the modification of the surface.