JP5493781B2 - Method for adjusting rotational balance in a composite grinding machine - Google Patents

Description

The present invention relates to a rotation balance adjusting method in a composite grinder having a plurality of grindstones on a grindstone table .

Conventionally, in a grinding machine using a rotating grindstone, various methods for reducing vibration due to the rotation of the grindstone have been disclosed in order to further improve the processing accuracy.
For example, in the prior art described in Patent Document 1, a dynamic balance device having a balance weight is mounted on the same axis of the grindstone, and the position where the vibration is minimized by moving the balance weight while the grindstone is rotating is calculated. A dynamic balancing method for a grinding wheel that adjusts the balance is disclosed.
Further, in the related art described in Patent Document 2, a balance adjusting method for a rotating body configured such that a plurality of balance weights movable in the circumferential direction of the rotating body rotate integrally with the rotating body, and An apparatus is disclosed.
Moreover, in the prior art described in Patent Document 3, the unbalanced phase angle and the unbalanced weight of the grindstone are detected, and the adhering material (adhesive etc.) having fluidity is placed at the position of the detected unbalanced phase angle. A method and apparatus for correcting the rotational balance of a rotating body by spraying (injecting) an amount corresponding to the detected weight is disclosed.
In addition, the prior art described in Patent Document 4 discloses a processing apparatus that includes a movable mass on a grindstone table, detects vibration of the grindstone table, and vibrates the movable mass so as to cancel the detected vibration. .
Further, in a conventional composite grinding machine in which two grindstones are mounted on a grindstone table, in order to suppress resonance of the respective drive motors that drive the two grindstones, the respective drive motors are rotated at different rotational speeds. There are also complex grinders.

JP-A-1-289660 Japanese Patent Laid-Open No. 2-65970 Japanese Patent Laid-Open No. 9-66434 JP 2002-254303 A

In the prior art described in Patent Literatures 1 to 4, a balance weight for adjusting the rotation balance, a deposit (a substitute for the balance weight), a movable mass, and the like are newly prepared for canceling the unbalance, Since the mass is moved to a position where the unbalance is canceled or is vibrated so as to cancel the unbalance, the apparatus tends to be complicated and large.
In addition, in the conventional composite grinding machine, it is possible to suppress the occurrence of resonance by rotating each drive motor at different rotational speeds, but it is not possible to suppress the vibration caused by each drive motor, so “swell” can occur. There is sex.
The present invention was devised in view of the above points, and in a composite grinding machine in which a plurality of grinding wheels are mounted on a grinding wheel base, vibrations can be generated with a simpler configuration without increasing the size of the apparatus. It is an object of the present invention to provide a rotation balance adjusting method in a composite grinding machine that can further reduce generation.

As means for solving the above-mentioned problems, the first invention of the present invention is a rotation balance adjusting method in a composite grinding machine as described in claim 1.
The method of adjusting a rotation balance in a composite grinding machine according to claim 1, wherein the grinding wheel drive motor of each grinding wheel apparatus includes a plurality of grinding wheel devices each equipped with a grinding wheel drive motor that rotationally drives the grinding wheel. The unbalance position according to the rotation angle when rotating in a single state is measured, and on the grindstone table, a pair of two rotation axes of the grindstone drive motor are arranged in parallel. At least one set of grindstone devices is mounted.
Then, the phase of the grindstone drive motor is adjusted so that the unbalance position of one grindstone drive motor of each set of grindstone devices arranged in parallel and the unbalance position of the other grindstone drive motor are symmetrical. In addition, the rotation directions of one grindstone drive motor and the other grindstone drive motor of each set of grindstone devices are opposite to each other and the rotation speeds are matched, and the unbalanced position of one rotating grindstone drive motor is This is a rotational balance adjustment method in a composite grinding machine in which the one and the other grinding wheel drive motors are rotated in synchronization so that the unbalanced position of the other grinding wheel drive motor that is rotating becomes a symmetrical position.

Further, the rotation balance adjustment method in the composite grinder described in the present embodiment is the vibration of the grinding wheel base in the composite grinding machine in which a plurality of grinding wheel devices including a grinding wheel drive motor that rotationally drives the grinding wheel are mounted on the grinding wheel base. Vibration detecting means is provided at an arbitrary position, and at least one set of a grindstone device is mounted on the grindstone table with two rotation axes of the grindstone drive motor arranged in parallel. Phase adjusting means for shifting the rotation angle phase of one grindstone drive motor of each set of grindstone devices arranged in parallel to the rotation angle phase of the other grindstone drive motor by a predetermined angle is provided.
And the step of rotating the one and the other wheel driving motors synchronously with the rotation directions of the one wheel driving motor and the other wheel driving motor being opposite to each other and matching the rotation speeds; And a step of shifting the rotational angle phase of the one grindstone drive motor by the phase adjusting means until the vibration of the grindstone head detected in this way is minimized.

A second invention of the present invention is a rotation balance adjusting method in a composite grinding machine as described in claim 2 .
The rotation balance adjustment method in the composite grinding machine according to claim 2, wherein the first grindstone includes a first grindstone drive motor and a first grindstone that rotates about the first grindstone rotation axis by the first grindstone drive motor. The 2nd whetstone device provided with the device, the 2nd whetstone drive motor, and the 2nd whetstone rotated about the 2nd whetstone rotation axis with the 2nd whetstone drive motor is the compound by which it was mounted on the whetstone stand. In the rotational balance adjustment method in the grinding machine, the first grindstone drive in which the first grindstone drive motor is rotated only with the first grindstone drive motor and the unbalance position corresponding to the rotation angle of the first drive motor is measured. The second whetstone driving motor is used in which the second whetstone driving motor is rotated in a state where only the second whetstone driving motor is used, and the unbalance position corresponding to the rotation angle of the second driving motor is measured.
The first grindstone device and the second grindstone device are placed on the grindstone table so that the rotation shaft of the first grindstone drive motor and the rotation shaft of the second grindstone drive motor are parallel and adjacent to each other. Assuming a virtual symmetry plane where the position symmetrical with respect to the rotation axis of the first grindstone drive motor coincides with the rotation axis of the second grindstone drive motor, the unbalanced position of the first grindstone drive motor and the second grindstone drive motor The phase of the first grindstone drive motor and the phase of the second grindstone drive motor are adjusted so that the unbalance position is a symmetric position with respect to the virtual symmetry plane.
Then, the rotation speed of the first grindstone drive motor and the rotation speed of the second grindstone drive motor are matched so that the rotation direction of the first grindstone drive motor and the rotation direction of the second grindstone drive motor are opposite to each other. The first whetstone driving motor and the first whetstone driving motor are arranged so that the unbalanced position of the rotating first whetstone driving motor and the unbalanced position of the rotating second whetstone driving motor are symmetrical with respect to the virtual symmetry plane. 2 is a method for adjusting a rotation balance in a composite grinder comprising: a step of rotating in synchronization with a grindstone drive motor.

Moreover, the rotation balance adjustment method in the composite grinding machine described in the present embodiment includes a first grindstone drive motor and a first grindstone that rotates around the first grindstone rotation axis by the first grindstone drive motor. A second grindstone device comprising a first grindstone device, a second grindstone drive motor, and a second grindstone that rotates about the second grindstone rotation axis by the second grindstone drive motor is placed on the grindstone table. In the rotation balance adjustment method in the composite grinding machine, vibration detecting means capable of detecting vibration is provided at an arbitrary position, and a phase adjustment signal is output to output the first grindstone drive motor and the second grindstone drive motor. Phase adjusting means for shifting the rotation angle phase by a predetermined angle.
The step of rotating the first grindstone drive motor and the second grindstone drive motor synchronously with the rotation directions of the first grindstone drive motor and the second grindstone drive motor being opposite to each other and matching the rotation speeds, the vibration detection And a step of shifting the rotation angle phase by outputting a phase adjustment signal from the phase adjusting means so that the vibration of the grindstone detected by the means is minimized.

Moreover, the composite grinder described in the present embodiment includes a first grindstone device including a first grindstone drive motor and a first grindstone that rotates around the first grindstone rotation axis by the first grindstone drive motor. A second whetstone device comprising: a second whetstone driving motor; and a second whetstone rotating around the second whetstone rotation axis by the second whetstone driving motor; a first whetstone driving motor; and a second whetstone driving motor. And a control means for outputting a drive signal to the composite grinding machine.
Phase adjustment means is provided for outputting a phase adjustment signal to shift the rotational angle phase of at least one of the first grinding wheel drive motor and the second grinding wheel drive motor by a predetermined angle with respect to the other rotational angle phase. The grindstone drive motor and the second grindstone drive motor are mounted on the grindstone table so that their rotation axes are parallel and adjacent to each other, and vibration detection can detect vibration of the grindstone table at an arbitrary position of the grindstone table. Means are provided.
The control means controls the first grindstone drive motor and the second grindstone drive motor so that the rotation directions of the first grindstone drive motor and the second grindstone drive motor are opposite to each other and are synchronously rotated at the same rotational speed. A drive signal is output.
The phase adjusting means is a composite grinding machine that outputs a phase adjustment signal and adjusts the rotation angle phase so that the vibration of the grindstone detected by the vibration detecting means is minimized.

According to the method for adjusting the rotation balance of the grindstone according to claim 1 and claim 2, the rotation shaft of one grindstone drive motor (or the first grindstone drive motor) of one set of grindstone devices and the other grindstone drive motor. (Or the second grindstone drive motor) is arranged in parallel with the rotation axis, and the unbalance position of each other is adjusted and rotated in synchronization with the opposite direction.
Thereby, the vibration generated by the rotation of the unbalance position of one of the grindstone drive motors (or the first grindstone drive motor) and the rotation of the unbalance position of the other grindstone drive motor (or the second grindstone drive motor). In the direction in which the grindstone drive motors are arranged, the vibrations generated in step 1 can be canceled out with each other. Therefore, the generation of vibration can be further reduced with a simpler configuration without increasing the size of the apparatus.

Further , according to the method for adjusting the rotation balance of the grindstone described in the present embodiment, the rotation shaft of one grindstone drive motor (or the first grindstone drive motor) of one set of grindstone devices and the other grindstone drive motor ( Alternatively, the rotational axis of the second grinding wheel drive motor) is arranged in parallel and rotated in the reverse direction, and the phase difference is adjusted until the vibration of the grinding wheel base is minimized.
Thereby, even if it is a case where the unbalanced mass of each grindstone drive motor differs, a vibration can be reduced more appropriately.
Further, since a grindstone driving motor provided with a phase adjusting means may be used, the apparatus can be realized with a simpler configuration without increasing the size of the apparatus.

In addition, according to the composite grinding machine described in the present embodiment, it is not necessary to add new elements that increase in size and complexity, and the first grindstone drive motor and the second grindstone can be configured with a simpler configuration. According to the unbalanced position of the drive motor and the unbalanced mass, it is possible to realize a composite grinding machine capable of reducing vibration more appropriately.

It is a figure explaining the example of the schematic plan view of the composite grinding machine 1 to which the rotation balance adjustment method of the grindstone of this invention is applied. An example (A) of the mounting state of the first grindstone device and the second grindstone device on the grindstone table 15 (the swivel table 12), as viewed from the direction A in FIG. FIG. 10 is a diagram for explaining an example (C) in a state where the phase difference Δθ of the unbalance position is held.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. FIG. 1A shows an example of a plan view of a composite grinder 1 of the present invention (a composite grinder 1 to which the method for adjusting the rotational balance of a grindstone of the present invention) is applied.
In each figure, the X axis, the Y axis, and the Z axis are orthogonal to each other, the Y axis indicates a vertically upward direction, the Z axis indicates a workpiece rotation axis ZW direction that is a rotation axis of the workpiece W, and X The axis indicates the advancing / retreating direction of the swivel base 12.

● [Composition of composite grinding machine 1 (Fig. 1)]
Next, the structure of the composite grinding machine 1 will be described with reference to FIG.
As shown in FIG. 1, the composite grinding machine 1 includes a base 10, a spindle table 11 that can reciprocate in the Z-axis direction on the base 10, and a grindstone that can reciprocate in the X-axis direction on the base 10. The swivel base 12 is capable of swiveling around the swivel axis ZS parallel to the Y axis on the grindstone base 15. In addition, about the control means (numerical control apparatus etc.) which controls each movable body, illustration is abbreviate | omitted.
The spindle table 11 is reciprocated in the Z-axis direction by the Z-axis drive motor 11M and the feed screw 11S, and the control means sends a control signal to the Z-axis drive motor 11M while detecting a signal from the position detection means 11E such as an encoder. The output is performed to position the spindle table 11 in the Z-axis direction.
The grinding wheel base 15 (see FIG. 2A) is reciprocated in the X-axis direction by the X-axis drive motor 12M and the feed screw 12S, and the control means detects the signal from the position detection means 12E such as an encoder while detecting the X-axis. A control signal is output to the drive motor 12M to position the grindstone table 15 in the X-axis direction.

On the spindle table 11, a headstock 20 having a center member 21 and a tailstock 30 having a center member 31 are placed. The center member 21 and the center member 31 rotate a workpiece parallel to the Z-axis direction. It is arranged on the axis ZW. In addition, a truing device 25 for truing the grindstone is installed on the head stock 20.
The center member 21 is provided on the main shaft 22, and a drive motor (not shown) is provided on the main shaft 22, and the control means arbitrarily moves the main shaft 22 around the workpiece rotation axis ZW passing through the tip of the center member 21 at an arbitrary angular velocity. Can be rotated up to an angle of.
The center member 31 is provided on a tailstock shaft 32, and the tailstock shaft 32 is supported so as to be rotatable or non-rotatable.
The workpiece W is supported at both ends (or near both ends) by the center member 21 and the center member 31 (may be a chuck instead of the center member), and is ground by the first grindstone T1 or the second grindstone T2. Processed.

In the vicinity of the center of the swivel base 12, a swivel motor 13 (see FIG. 2A) is provided. The control means outputs a control signal to the turning motor 13 while detecting a signal from the angle detecting means such as an encoder, and controls the turning angle of the turntable 12.
Then, on the swivel base 12, a first grindstone device including a first grindstone bearing device 40 having a first grindstone T1 (angular grindstone in the example of FIG. 1) and a first grindstone drive motor 40M, and a second grindstone Two types of grindstone devices including a second grindstone bearing device 50 having T2 (a plain grindstone in the example of FIG. 1) and a second grindstone drive motor 50M surround the turning motor 13. Has been placed. The first grindstone rotation axis ZT1 that is the rotation axis of the first grindstone T1 and the second grindstone rotation axis ZT2 that is the rotation axis of the second grindstone T2 are parallel to each other and orthogonal to the turning axis ZS.
Further, the composite grinding machine 1 is provided with a coolant nozzle for supplying a coolant in the vicinity of a contact portion (grinding point) between the workpiece W and each grindstone, but the illustration is omitted.

● [Mounting state of the first grinding wheel device and the second grinding wheel device on the grinding wheel stand (FIG. 2 (A))]
Next, with reference to FIG. 2A, the mounting state of the first grindstone device and the second grindstone device on the grindstone table 15 will be described.
The first grindstone drive motor 40M and the second grindstone drive motor 50M are configured so that the rotation axis Z40 of the first grindstone drive motor 40M and the rotation axis Z50 of the second grindstone drive motor 50M are parallel and adjacent to each other. 15 is mounted.
The drive pulley 40D connected to the first grindstone drive motor 40M transmits rotational power to the driven pulley 40J via the belt 40B, and rotates the first grindstone T1 connected to the driven pulley 40J. Similarly, the drive pulley 50D connected to the second grindstone drive motor 50M transmits rotational power to the driven pulley 50J via the belt 50B, and rotates the second grindstone T2 connected to the driven pulley 50J.
Further, the turning motor 13 turns the turntable 12 around the turn axis ZS with respect to the grindstone table 15.
As shown in FIG. 2A, the first grindstone rotation axis ZT1 and the second grindstone rotation axis ZT2 (with the workpiece rotation axis ZW) are arranged on a relative movement plane MF orthogonal to the turning axis ZS. The first grindstone rotation axis ZT1 and the second grindstone rotation axis ZT2 are parallel.

[[Method for adjusting the rotation balance of the grindstone in the first embodiment (FIG. 2 (B))]
Next, a method for adjusting the rotational balance of the grindstone in the first embodiment will be described with reference to FIG.
In the first step, the operator rotates the first grindstone drive motor 40M only in the state of the first grindstone drive motor 40M, and measures the unbalance position UB1 according to the rotation angle of the first grindstone drive motor 40M. . For example, phase detection means for detecting the phase of the drive pulley 40D attached to the shaft member of the first grindstone drive motor 40M and vibration detection means for detecting vibration of the first grindstone drive motor 40M are attached. The unbalance position UB1 can be specified.
In the next step, similarly, the operator rotates the second grindstone drive motor 50M only in the state of the second grindstone drive motor 50M, and unbalanced position UB2 corresponding to the rotation angle of the second grindstone drive motor 50M. Measure. For example, phase detection means for detecting the phase of the drive pulley 50D attached to the shaft member of the second grindstone drive motor 50M and vibration detection means for detecting vibration of the second grindstone drive motor 50M are attached. The unbalance position UB2 can be specified.

In the next step, the operator places the rotation axis Z40 of the first grindstone drive motor 40M and the rotation axis Z50 of the second grindstone drive motor 50M in parallel and next to each other on the grindstone table 15 (on the swivel table 12). As described above, the first grindstone device (the first grindstone bearing device 40 and the first grindstone drive motor 40M) and the second grindstone device (the second grindstone bearing device 50 and the second grindstone drive motor 50M) are placed.
Further, a virtual symmetry plane MA (see FIGS. 1 and 2A) in which the position symmetric with respect to the rotation axis Z40 of the first grindstone drive motor 40M coincides with the rotation axis Z50 of the second grindstone drive motor 50M is virtually assumed. Set (assuming).
For example, when the first grindstone drive motor 40M and the second grindstone drive motor 50M are stopped, the unbalance position UB1 of the first grindstone drive motor 40M and the unbalance position UB2 of the second grindstone drive motor 50M are virtual. The phase of the shaft member (drive pulley 40D) of the first grindstone drive motor 40M and the phase of the shaft member (drive pulley 50D) of the second grindstone drive motor 50M are adjusted so as to be symmetrical with respect to the symmetry plane MA. To do. In the example of FIG. 2B, an example in which the position is symmetric with respect to the virtual symmetry plane MA and is adjusted to the most distant position is shown.

In the next step, the control means rotates the first grindstone drive motor 40M so that the rotation direction of the first grindstone drive motor 40M and the rotation direction of the second grindstone drive motor 50M are opposite to each other. The unbalanced position UB1 of the rotating first grinding wheel drive motor 40M and the unbalanced position UB2 of the rotating second grinding wheel drive motor 50M are assumed to be the same. The first grindstone drive motor 40M and the second grindstone drive motor 50M are rotated synchronously so as to rotate while maintaining a symmetrical position with respect to the symmetry plane MA.
For example, a motor with an encoder is used for the first grindstone drive motor 40M and the second grindstone drive motor 50M, and the phases of the unbalance position UB1 and the unbalance position UB2 detected by each encoder are stored in the control means. . Based on the detection signals from the encoders, the first whetstone driving motor 40M and the control means rotate the stored unbalanced positions UB1, UB2 while maintaining the symmetrical positions with respect to the virtual symmetry plane MA. A rotation drive signal is output to the second grindstone drive motor 50M.

As described above, in the method for adjusting the rotation balance of the grindstone in the first embodiment, the above-described device is simply added to the arrangement method and the rotation method of the two grindstone drive motors without preparing a new mass for canceling the unbalance. Thus, in the direction in which the first grindstone drive motor 40M and the second grindstone drive motor 50M are arranged (in the left-right direction in the case of FIG. 2B), the mutual vibrations can be offset.
Thereby, generation | occurrence | production of a vibration can be reduced more by simpler structure, without enlarging an apparatus.

[[Method for adjusting the rotational balance of the grindstone in the second embodiment (FIG. 2 (C))]
Next, a method for adjusting the rotation balance of the grindstone in the second embodiment will be described with reference to FIG.
In the second embodiment, there is provided a vibration detecting means for detecting the vibration of the grindstone, a point that the control means outputs a phase adjustment signal based on the detected vibration, and a first grindstone driving motor. The point that the phase adjustment means is provided to at least one of 40M or the second grinding wheel drive motor 50M when the phase adjustment signal is input, the phase advances by a predetermined amount or returns by a predetermined amount is the same as the first embodiment. Different.

Similar to the first embodiment, the rotation axis Z40 of the first grindstone drive motor 40M and the rotation axis Z50 of the second grindstone drive motor 50M are parallel and adjacent to each other on the grindstone table 15 (on the swivel table 12). The first grindstone device (the first grindstone bearing device 40 and the first grindstone drive motor 40M) and the second grindstone device (the second grindstone bearing device 50 and the second grindstone drive motor 50M) are placed so as to match. .
Further, as shown in FIG. 2A, vibration detection means 14 capable of detecting the vibration of the grindstone table 15 (the swivel table 12) is provided at an arbitrary position on the grindstone table 15 (on the swivel table 12). ing.

In the first step, the controller rotates the first grindstone drive motor 40M so that the rotation direction of the first grindstone drive motor 40M and the rotation direction of the second grindstone drive motor 50M are opposite to each other. The first grindstone drive motor and the second grindstone drive motor are rotated so that the first grindstone drive motor and the second grindstone drive motor rotate in synchronization with the rotation speed of the second grindstone drive motor 50M. A drive signal is output.
In the next step, the control means outputs a phase adjustment signal until at least one of the first grindstone drive motor 40M and the second grindstone drive motor 50M until the grindstone vibration detected by the vibration detection means 14 is minimized. Shift (adjust) the phase of.
As described above, the phase difference Δθ between the unbalance position UB1 of the first grindstone drive motor 40M and the unbalance position UB2 of the second grindstone drive motor 50M is obtained, and Δθ that minimizes the generated vibration is obtained. Rotate while maintaining

As described above, in the method for adjusting the rotational balance of the grindstone according to the second embodiment, phase adjustment is performed on at least one of the first grindstone drive motor and the second grindstone drive motor without newly preparing a mass for canceling the unbalance. By using the motor to which the means is added and further adding the vibration detecting means, the generated vibration can be automatically adjusted to be minimized.
Further, in the second embodiment, even when the unbalanced mass of the first grindstone drive motor is different from the unbalanced mass of the second grindstone drive motor, vibration can be effectively reduced. . In addition to the first and second grindstone drive motors, vibrations can be reduced comprehensively for all elements placed on the grindstone table 15 including the first and second grindstones.
Thereby, generation | occurrence | production of a vibration can be reduced more by simpler structure, without enlarging an apparatus.

  As described above in the first and second embodiments, in the composite grinding machine using two grindstone drive motors that generate vibrations one by one, the vibration generated from each grindstone drive motor is used. By offsetting each other's vibration, it is possible to reduce the occurrence of vibration with a simpler configuration without preparing a new mass to cancel the imbalance, thus improving machining accuracy. Can be made.

The method for adjusting the rotational balance of the grindstone of the present invention and the composite grinding machine 1 are not limited to the appearance, configuration, structure, processing procedure, and the like described in the present embodiment, and various modifications can be made without changing the gist of the present invention. Can be added and deleted.
In the description of the present embodiment, an example in which vibration is reduced for the first and second grindstone drive motors has been described. However, the generated vibration can be similarly reduced for the first grindstone T1 and the second grindstone T2. .
In addition, since the rotation speed (number of rotations) of the first grindstone drive motor and the second grindstone drive motor are the same, the finishing accuracy of the work surface of the workpiece can be made uniform, and the occurrence of “waviness” can be suppressed. Can do.
In the description of the present embodiment, an example in which the first grindstone T1 and the second grindstone T2 are arranged in the same direction is shown, but the first grindstone T1 is installed in the opposite direction as shown by the broken line in FIG. May be. At this time, since the direction of the grindstone drive motor is reversed, the rotation directions of the first and second grindstone drive motors are the same, but when viewed from one direction of the grindstone base 12 (from the direction A in FIG. 1). (See) It is only necessary that the rotation directions of the grinding wheel drive motors are opposite to each other.
In the present embodiment, an example in which two grindstone devices are placed on the grindstone table 12 is shown, but the number is not limited to two, and two or more grinders are possible. In order to balance the rotation of the grinding wheel drive motor in the reverse direction and the synchronous rotation, it is desirable that the number of the grinding wheel devices is an even number (one set consists of two). It is desirable to mount at least one set of grinding wheel devices).
In this way, by rotating the grindstone drive motors of the two grindstone devices arranged in parallel to each other in the opposite direction in a synchronized manner, the rotational balance in the two grindstone devices of each set is adjusted, and the grindstone table The overall balance can be adjusted.

DESCRIPTION OF SYMBOLS 1 Composite grinder 10 Base 11 Spindle table 12 Swivel table 13 Swivel motor 14 Vibration detection means 20 Spindle table 30 Tailstock 40 First grindstone bearing device 40M First grindstone drive motor 50 Second grindstone bearing device 50M Second grindstone drive Motor MA Virtual symmetry plane T1 First grindstone T2 Second grindstone UB1, UB2 Unbalanced position W Work Z40 Rotation axis Z50 (of the first grindstone drive motor) ZS Rotation axis ZT1 First grindstone Rotation axis ZT2 Second grinding wheel rotation axis ZW Workpiece rotation axis

Claims (2)

In a composite grinding machine in which a grindstone device equipped with a grindstone drive motor that rotationally drives a grindstone is mounted on a grindstone base,
The grindstone drive motor of each grindstone device has an unbalance position measured according to the rotation angle when rotated in a single state,
On the grindstone table, at least one set of grindstone devices is mounted with two of which the rotation axes of the grindstone driving motors are arranged in parallel.
The phase of the grindstone drive motor is adjusted so that the unbalance position of one grindstone drive motor of each set of grindstone devices arranged in parallel and the unbalance position of the other grindstone drive motor are symmetrical positions, In addition, the rotation direction of one grindstone drive motor and the other grindstone drive motor of each set of grindstone devices are opposite to each other, and the rotation speeds are made to coincide with each other. The one and the other grindstone drive motors are rotated in synchronization so that the unbalanced position of the other wheel drive motor in the middle is a symmetric position.
A method for adjusting the rotational balance in a composite grinding machine. A first grindstone device comprising: a first grindstone drive motor; and a first grindstone that rotates about a first grindstone rotation axis by the first grindstone drive motor;
In a composite grinding machine in which a second grinding wheel device including a second grinding wheel driving motor and a second grinding wheel rotating around a second grinding wheel rotation axis by the second grinding wheel driving motor is placed on a grinding wheel base. In the rotation balance adjustment method,
A first whetstone driving motor in which the first whetstone driving motor is rotated in the state of only the first whetstone driving motor, and the unbalance position according to the rotation angle of the first driving motor is measured;
Using the second grindstone drive motor that rotates the second grindstone drive motor only in the state of the second grindstone drive motor and has measured the unbalance position according to the rotation angle of the second drive motor,
The first grindstone device and the second grindstone device are placed on the grindstone table so that the rotation shaft of the first grindstone drive motor and the rotation shaft of the second grindstone drive motor are parallel and adjacent to each other.
Assuming a virtual symmetry plane where the position symmetrical with respect to the rotation axis of the first grindstone drive motor coincides with the rotation axis of the second grindstone drive motor, the unbalanced position of the first grindstone drive motor and the second grindstone drive motor The phase of the first grindstone drive motor and the phase of the second grindstone drive motor are adjusted so that the unbalance position is a symmetric position with respect to the virtual symmetry plane,
Rotate by rotating the rotation speed of the first grindstone drive motor and the rotation speed of the second grindstone drive motor so that the rotation direction of the first grindstone drive motor and the rotation direction of the second grindstone drive motor are opposite to each other. The first whetstone driving motor and the second whetstone are set so that the unbalanced position of the middle first whetstone driving motor and the unbalanced position of the rotating second whetstone driving motor are symmetrical with respect to the virtual symmetry plane. A step of rotating in synchronization with the drive motor;
The rotation balance adjustment method in the compound grinder which consists of.

Images