JPH05228834A - Grinding wheel dressing device - Google Patents

Abstract

PURPOSE:To adjust the dress diameter of a grinding wheel automatically. CONSTITUTION:A displacement plate 38 and a supporting member 19 are connected to a rotary shaft 32, which is rotated by an AC servo motor 28 with speed reducer, through a plate spring 39, and a dressing tool 18 is fixed to the supporting member 19. A stepping motor 40 for moving the displacement plate 38 in the radial direction of the rotary shaft 32 in response to the command signal input from the outside is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for dressing the surface of a grindstone for grinding a groove or the like of a ball bearing in an arc shape having a predetermined radius.

[0002]

2. Description of the Related Art Generally, in a ball bearing 10 as shown in FIG. 4, an outer ring 11 for holding a rolling element 12 thereof.
When the groove 11a is grinded with a grindstone, it is necessary to dress the grindstone in an arcuate cross-section that matches the groove 11a. As a method of dressing such a grindstone, as shown in FIG. 5, while rotating the grindstone 14 around its rotation center axis 16 and applying a dressing tool 18 made of diamond or the like to the surface of the grindstone 14, By turning the dressing tool 18 around the center axis 15 in the direction orthogonal to the rotation center axis 16 (the direction perpendicular to the paper surface in FIG. 5), the whetstone 14 has a convex arc shape with a radius R. The curved surface 14a is formed.

Conventionally, as a device for dressing the grindstone 14, the dressing tool 18 is fixed to a supporting member 19 as shown in FIG. 5, and the supporting member 19 is rotationally driven by a rotary hydraulic cylinder or the like. The rotation support means connects the entire support member 19 to the rotation shaft 15 by connecting to the output shaft of the rotation means.
A device for turning around is used.

[0004]

In the above apparatus, the dressing tool 18 made of diamond is worn and the dressing tool 18 is thermally displaced by heat generated during dressing.
The dress diameter (that is, the turning radius of the tip of the dressing tool 18 about the rotation center axis 15) R gradually changes. Therefore, in order to maintain good processing accuracy regardless of the number of dresses, the dress diameter R must be corrected at an appropriate timing.

Heretofore, heretofore, the dressing tool 18 has been rotated with respect to the rotation output shaft of the rotation driving means by operating a handle or the like.
Is manually moved in the radial direction integrally with the support member 19. However, in such a manual operation, it is difficult to perform precise fine adjustment of the dress diameter, and such a manual adjustment operation greatly hinders automation of the grinding process and further unattended operation. ing.

Further, when such a means for correcting the dress diameter is added to the apparatus, the size of the entire apparatus is easily increased, and therefore, it is a problem to correct the dress diameter with a structure as compact as possible. There is.

In view of such circumstances, the present invention provides a grindstone dressing device capable of automatically adjusting the dressing diameter of a grindstone, and more preferably, a grindstone dressing device capable of downsizing the entire device. The purpose is to provide a device.

[0008]

SUMMARY OF THE INVENTION The present invention is an apparatus for dressing the surface of a grindstone in an arc shape having a predetermined radius, which comprises a rotating member and a rotating member for rotating the rotating member around its own axis. A drive member, a displacement member movably connected to the rotary member in the radial direction of rotation with respect to the rotary member, and a dressing tool fixed in a state of facing the radial direction of rotation, and the displacement members at respective positions. And a radial direction adjusting drive means for moving the displacement member in the radial direction of rotation thereof by an amount corresponding to a command signal input from the outside (claim 1).

Regarding the input means of the command signal to the radial adjustment drive means, a dress diameter detecting means for detecting the dress diameter of the dressed grindstone and a dress diameter detected by the dress diameter detecting means are used. It is desirable to provide a control means for outputting a command signal to the radial direction adjusting drive means (claim 2).

Further, the rotating member is formed in a cylindrical shape having a through hole along its rotation axis, and the rotation driving means is
Consists of a rotary drive motor with an axial through hole in the center,
The rotary member is connected to the output shaft of the rotary drive motor in a state where the through hole of the rotary drive motor and the through hole of the rotary member are aligned, and the rotary output shaft is used as the radial direction adjusting drive means. And a radial direction adjusting motor having this rotary output shaft arranged in a position aligned with the respective through holes, and movable in the axial direction into the through holes of the rotary drive motor and the through holes of the rotary member. And an adjustment shaft connected to the rotation output shaft of the radial adjustment motor such that the rotation output shaft cannot rotate relative to the rotation output shaft and is relatively movable in the axial direction, and the rotation force of the adjustment shaft itself. By including a feed screw mechanism that converts the axial moving force of the adjusting shaft into a force that moves the displacement member in the radial direction of rotation of the adjusting member,
A more excellent effect as described below can be obtained (claim 3).

[0011]

According to the apparatus of claim 1, the dressing tool fixed to the displacement member is connected to the rotating member by rotating the rotating member by the rotation driving means while the dressing tool is in contact with the surface of the grindstone. In addition, the displacement member and the dressing tool held by the holding member are integrally swiveled around the rotation axis of the rotating member, so that the whetstone can be dressed.

While the dressing work proceeds, if the dressing diameter deviates from a desired value due to wear or thermal displacement of the dressing tool, a predetermined command signal is input to the radial direction adjusting drive means. By doing so, the radial adjustment drive means moves the displacement member in the rotational radius direction by the amount specified by the command signal, and by this movement, the turning radius of the dressing tool fixed to the displacement member, that is, The dress diameter is corrected automatically.

Specifically, according to the apparatus of claim 2,
After the dressing of the grindstone is performed, the dress diameter is automatically detected by the dress diameter detecting means, and based on the comparison between the detected dress diameter and the preset desired dress diameter, the above-mentioned from the controlling means. A command signal is input to the radial driving means. As a result, the displacement member is automatically driven by the radial direction adjusting drive means so that the dress diameter becomes a desired value.

According to the third aspect of the present invention, when the rotary output shaft of the radial direction adjusting motor rotates, the adjusting shaft connected to this rotary output shaft also rotates, and with this rotation, the feed screw mechanism. By this action, the adjustment shaft itself moves in the axial direction with respect to the rotation output shaft. Further, this axial moving force is converted into a force for moving the displacement member in the rotational radius direction by the force converting mechanism, whereby the position adjustment of the dressing tool, that is, the dress diameter is executed.

With respect to the structure of the entire apparatus, the rotary member, the rotary drive motor, and the radial adjustment motor are arranged on the axis, and the adjustment shaft is provided in the through holes of the rotary member and the rotary drive motor. Since it is arranged,
No special space is required beside the rotary member or the rotary drive motor.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

The grindstone dressing device 20 shown here comprises an upper housing 22 and a lower housing 24 which are joined to each other. The upper housing 22 is formed in a container shape that opens downward, and the lower housing 24 is formed in a cylindrical shape having a vertical through hole 26 in the center.

An AC servomotor (rotational drive motor) 28 having a speed reducer 27 incorporated therein is housed in the upper housing 22. This AC servo motor 28 with a reducer
The output shaft 31 is fixed to the upper surface of the lower housing 24 in a tubular shape having a through hole 30 in the vertical direction (axial direction) at the center. This AC servomotor 28 with a speed reducer has an encoder 29 for detecting its own rotation phase.
And a feedback function for rotating the output shaft 31 only within a range of 180 ° based on the detection result of the encoder 29.

A rotating shaft (rotating member) 32 extending in the vertical direction is connected to the output shaft 31. This rotating shaft 3
2 has a cylindrical shape having a through hole 35 in the vertical direction (axial direction) at the center, and in a state of penetrating the through hole 26 of the lower housing 24, the lower housing 24 is provided with bearings 33, 34 through its own shaft. It is rotatably supported around.

A displacement plate (constituting a displacement member) 38 is connected to a lower end portion 36 of the rotary shaft 32 via a plurality of leaf springs (holding members) 39. Two leaf springs 39 are provided on each of the left and right sides, and the upper and lower ends of the leaf springs 39 are provided on the rotary shaft 3.
2 on the lower end portion 36 and the side surface of the displacement plate 38, respectively.
It is fixed at 7. Each leaf spring 39 can be bent and deformed in the left-right direction, and by these deformations, the displacement plate 38 can be displaced in the left-right direction with respect to the rotating shaft 32, and the elastic return force of each leaf spring 39 is constantly displaced. It acts as a holding force for returning the plate 38 to the central position.

On the lower surface of the displacement plate 38, a supporting member (displacement member) is provided at a position radially displaced from the center thereof.
19 is fixed, and the inner surface of the support member 19 (see FIGS.
A dressing tool 18 made of diamond or the like is fixed inwardly on the left side surface. This dress tool 1
The fixed position of No. 8 is set to a position in which its tip is displaced radially outward (right side in FIG. 1) from the central position of the displacement plate 38.

A stepping motor (radial adjustment motor) 40 is fixed to the top wall of the upper housing 22 via a cylindrical bracket 41. The rotation output shaft 42 of the stepping motor 40 is directed downward and penetrates the top wall of the upper housing 22.
A spline shaft 44 is externally fitted and fixed to the.

An adjusting shaft 46 is connected to the lower end of the spline shaft 44. The adjustment shaft 46 extends in the vertical direction and is accommodated in both the through hole 30 of the AC servomotor 28 with a speed reducer and the through hole 35 of the rotary shaft 32. At the upper end of the adjusting shaft 46, a cylindrical portion 48 having a male screw on the outer periphery is formed, and the inner peripheral surface of the cylindrical portion 48 and the outer peripheral surface of the spline shaft 44 are connected by a spline 45. That is, the adjustment shaft 46 is connected to the rotation output shaft 42 and the spline shaft 44 so as not to be rotatable relative to each other and to be relatively movable in the axial direction (vertical direction).

The adjusting shaft 46 and the spline shaft 44
A cylindrical screw member 50 is interposed between the outer peripheral surface of the above and the inner peripheral surface of the through hole 30 of the AC servomotor with a reduction gear 28. The screw member 50 is provided on the upper housing 22.
It is non-rotatably fixed to the bracket 41 while penetrating the ceiling wall. An internal thread 52 is formed on the inner peripheral surface of the lower end portion of the screw member 50, and the internal thread 52 is formed on the adjustment shaft 46.
It is screwed into the male screw of the tubular portion 48 at. That is, a feed screw mechanism is configured by the cylindrical portion 48 and the screw member 50, and the rotational force of the adjusting shaft 46 around its own axis is converted into a moving force in the axial direction (vertical direction) of the adjusting shaft 46 itself. It is like this.

Further, below the rotary shaft 32, a force converting mechanism 53 for converting the axial moving force of the adjusting shaft 46 into the radial moving force of the displacement plate 38 and the support member 19.
Is provided.

This force converting mechanism 53 is shown in FIGS. A conical recess 54 is formed at the lower end of the adjusting shaft 46. On the other hand, a pair of front and rear brackets 56 are projectingly provided at appropriate positions on the lower surface of the rotary shaft 32, and both brackets 56 are provided.
A horizontal rotary shaft 58 is provided between the two, and a lever 60 is attached so as to be rotatable around the rotary shaft 58. A conical recess 61 is formed in the center of the upper surface of the lever 60, and the recess 61 and the adjusting shaft 46 are formed.
A ball 64 is sandwiched between the concave portion 54 and the concave portion 54.

On the lower surface of the lever 60, a tapered protruding portion 62 is provided so as to protrude downward. On the other hand, on the side of the displacement plate 38, a hole 66 that opens upward is provided as a recess, and the protruding portion 62 is fitted into the hole 66. This hole 66
Is formed in a taper shape in which the diameter increases toward the opening side (upper side), and the displacement plate 38 is in the central position, that is, the position displaced from the protrusion 62 in the radial direction in the state where the leaf spring 39 is not deformed. (More specifically, it is formed at a position displaced to the side where the displacement member 19 is fixed). Therefore, the projecting portion 62 is forcibly inserted into the hole 66 in a state where the leaf spring 39 is slightly bent, and the projecting portion 62 is recessed by the elastic restoring force (holding force) of the leaf spring 39. It is in a state of being pressed against the inner peripheral surface of 66. Due to the balance of the forces, the displacement member 19 and the dressing tool 18 are held at fixed positions.

On the other hand, a post gauge (dress diameter detecting means; FIG. 1) 68 for measuring the dress diameter of the dressed grindstone 16 from the machining size of the workpiece is installed near the working position of the dressing tool 18. The detection signal output from the post gauge 68 is the controller (control means) 7
It is designed to be input to 0. This controller 7
0 is the dress diameter measured by the post gauge 68,
The dressing diameter is compared with a desired dressing diameter set in advance, and when the difference between the two exceeds a certain value, a pulse signal corresponding to the difference is output to the stepping motor 40 to adjust the dressing diameter.

Next, the operation of this device will be described.

First, the outer peripheral surface of the grindstone 14 is applied to the dressing tool 18, and the output shaft 31 of the AC servomotor 28 with a reduction gear is rotated 180 ° while rotating the grindstone 14 around the horizontal rotation center axis 16. .. As a result, the rotating shaft 32 connected to the output shaft 31, the displacement plate 38, and the displacement member 19 are integrally driven to rotate, and the dressing tool 18 fixed to the displacement member 19 is, as shown in FIG. , Revolves around the rotation center axis 15 of the rotation shaft 32. As a result of such turning, an arcuate curved surface having a predetermined radius R is formed on the grindstone 14.
Is formed on the outer peripheral portion of the.

The actual dress diameter R of the dressed grindstone 14 is measured by the post gauge 68, and the measurement result is input to the controller 70. This controller 70
Compares the above measurement result with a preset desired dress diameter value, and automatically adjusts the dress diameter according to the difference between the two.

Specifically, the adjustment of the dress diameter is performed by inputting a predetermined number of pulse signals to the stepping motor 40. That is, this stepping motor 4
When 0 receives a pulse signal and rotates the rotary output shaft 42 by an angle corresponding to the pulse signal, the spline shaft 44 fixed to the rotary output shaft 42 and the adjusting shaft 46 splined to the spline shaft 44 are integrated. The adjusting shaft 46 moves up and down with respect to the screw member 50 and the spline shaft 44 by the action of the feed screw mechanism.

Here, when the adjusting shaft 46 is lowered,
The lever 60 is pushed down via the ball 64 by the descending amount, and the projecting portion 62 projecting from the lever 60 has the hole 6
6 is inserted more deeply. Since the projecting portion 62 and the hole 66 are formed in a tapered shape, the displacement plate 38 and the supporting member 19 have a diameter that resists the elastic force of the leaf spring 39 as the fitting depth of the projecting portion 62 increases. Direction (left in Figures 1 and 2)
When the dressing tool 18 is pulled, the turning radius of the dressing tool 18 (that is, the dressing diameter) is reduced accordingly. Conversely, when the adjustment shaft 46 rises, the protrusion 62 of the lever 60 can escape upward from the hole 66 of the displacement plate 38 by the amount of the elevation, so that the displacement plate 38 and support The member 19 is moved toward the central position (see FIG. 1, by the elastic force (holding force) of the leaf spring 39).
In the case of 2, it is pushed back to the right), and the turning radius (that is, the dress diameter) of the dressing tool 18 increases by that amount.

That is, in this structure, the dressing diameter of the dressing tool 18 changes by an amount corresponding to the rotation amount of the rotation output shaft 42 of the stepping motor 40.
Therefore, when a predetermined number of pulse signals are input to the stepping motor 40, fine adjustment of the dress diameter can be accurately performed according to the number of pulses.

As described above, in this device, the dressing diameter of the dressing tool 18 is automatically adjusted by the operation of the stepping motor 40 instead of the conventional manual operation. Even if the actual dress diameter deviates from the set value due to wear or thermal displacement of the tool, it is possible to automatically and more accurately correct the dress diameter to an appropriate value without requiring manpower.

Moreover, in this embodiment, a post gauge 68 for measuring the dress diameter of the grindstone 14 after dressing is used.
And a controller 70 for controlling the driving of the stepping motor 40 (that is, radial direction adjustment control) according to the measurement result, so that appropriate timing is provided according to the difference between the actual dress diameter and the desired dress diameter. With, the dress diameter can be automatically corrected, and the dressing work can be unmanned.

In the apparatus of this embodiment, the rotary shaft 32,
The AC servo motor with reduction gear 28 and the stepping motor 40 are arranged in a straight line to form the AC servo motor with reduction gear 2
8 and the rotary shaft 32, the adjustment shaft 46 is housed in the through holes 30 and 35 at the center of the rotary shaft 32, and the stepping motor 40
Is converted into an axial moving force of the adjusting shaft 46 by a feed screw mechanism, and this axial moving force is further moved by the force converting mechanism 53 provided below the rotating shaft 32 in the radial direction of the displacement plate 38. Therefore, it is possible to install means for adjusting the dress diameter without providing a special space beside the AC servomotor 28 with a speed reducer or the rotary shaft 32. Therefore, there is an advantage that the entire apparatus can be made compact.

The present invention is not limited to such an embodiment, and the following modes can be taken as an example.

(1) In the above embodiment, the AC servomotor 28 with a speed reducer is used as the rotation driving means. However, in the present invention, the rotation driving is performed by another electric motor or a hydraulic actuator. May be. However, in the case of using a hydraulic actuator, the turning speed gradually increases as the temperature of the hydraulic oil rises, so it is difficult to obtain a uniform dress shape, while using an electric motor gives a stable turning speed. There is an advantage that the dress accuracy can be improved. Further, as shown in the above-mentioned embodiment, if the encoder 29 and the servomotor having a feedback function based on the encoder 29 are used, the dressing tool 18 can be automatically moved within a constant turning angle range without providing a special position detecting means. It is possible to rotate only, and there is an advantage that the device can be made more compact.

(2) In the above embodiment, the adjustment shaft 46 is connected to the rotation output shaft 42 of the stepping motor 40 by the spline 45. However, the adjustment shaft 46 is relative to the rotation output shaft 42. As long as they are non-rotatable and can be moved relative to each other in the axial direction, in addition to the above splines,
You may make it connect by fitting of various modified cross sections.

(3) In the above embodiment, the post gauge 68 for measuring the dress diameter of the grindstone 14 from the machining size of the workpiece is provided, and the dress diameter is automatically adjusted based on the measurement result. However, if there is an almost constant relationship between the number of dresses and the actual change in dress diameter,
A counter for counting the number of dresses may be provided, and the dressing diameter adjusting operation may be performed each time the count reaches a predetermined value. Further, an operation panel provided with a numeric keypad or the like may be provided, and the operator may adjust the dress diameter by a value input through the operation panel.

[0042]

As described above, according to the present invention, the displacement member is connected to the rotary member that is rotationally driven by the rotary drive means so as to be displaceable in the radial direction, and the dressing tool is fixed to the displacement member. Since it is provided with a radial direction adjusting means for moving the displacement member in the radial direction according to a command signal input from the outside, the actual dress diameter deviates from the set value due to wear or thermal displacement of the dressing tool, for example. However, there is an effect that the dress diameter can be automatically and accurately corrected to an appropriate value without requiring manpower.

Further, in the apparatus according to the second aspect, the actual dress diameter of the grindstone after dressing is measured, and the radial direction is automatically adjusted based on the measurement result. The dress diameter can be automatically corrected at an appropriate timing according to the change of the dress diameter, and the dressing work can be unmanned.

Further, in the apparatus according to the third aspect, the rotary member, the rotary drive motor, and the radial adjustment motor are arranged on the axis thereof, and the adjustment shaft is housed in the central through hole of the rotary drive motor and the rotary member. The rotational force of the radial adjustment motor is converted into an axial movement force of the adjustment shaft by the feed screw mechanism, and this axial movement force is converted into a radial movement force of the displacement member by the force conversion mechanism. Therefore, it is possible to add means for adjusting the dress diameter without providing a special space on the side of the rotary drive motor or the rotary member, which has the advantage that the entire apparatus can be made compact.

[Brief description of drawings]

FIG. 1 is a sectional front view of a grindstone dressing device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional front view showing a force converting mechanism provided in the grindstone dressing device.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view showing a general example of a ball bearing.

FIG. 5 is an explanatory view showing a state in which a whetstone is dressed by turning a dressing tool.

[Explanation of symbols]

 14 grindstone 19 support member (constituting displacement member) 20 grindstone dressing device 28 AC servomotor with reduction gear (rotational drive motor) 29 encoder (rotation detection means) 30 through hole of AC servomotor with reduction gear 32 rotary shaft (rotational member) ) 35 through-hole of rotary shaft 38 displacement plate (constituting displacement member) 39 leaf spring (holding member) 40 stepping motor (radial adjustment motor) 42 rotation output shaft 46 adjustment shaft 50 screw member 53 force conversion mechanism 68 post gauge ( Dress diameter detection means) 70 Controller (control means)

Claims (3)

[Claims] 1. A device for dressing the surface of a grindstone in an arc shape having a predetermined radius, comprising a rotating member, a rotation driving means for rotating the rotating member around its own axis, and the rotating member. A displacement member, which is movably connected to the rotating member in the radial direction of rotation, and to which the dressing tool is fixed while facing the radial direction of rotation, a holding member for holding the displacement member at each position, and an external member. And a radial direction adjusting drive means for moving the displacement member in the radial direction of rotation thereof by an amount according to a command signal input from the grinding wheel dressing device. 2. The dressing device according to claim 1, wherein dressing diameter detecting means for detecting a dressing diameter of the dressed grinding stone, and the radial direction according to the dressing diameter detected by the dressing diameter detecting means. A whetstone dressing device comprising: a control means for outputting a command signal to the adjustment drive means. 3. The grindstone dressing device according to claim 1 or 2, wherein the rotating member is formed in a tubular shape having a through hole along a rotation axis thereof, and the rotation driving means is provided at a center thereof with an axial through hole. A rotary drive motor having a rotary drive motor having a through hole of the rotary drive motor and the through hole of the rotary member aligned in a straight line, the rotary member is connected to the output shaft of the rotary drive motor, and As the adjustment drive means, there is provided a rotation output shaft, and the rotation output shaft is arranged in a position where the rotation output shaft is aligned with the respective through holes, a radial adjustment motor, a through hole of the rotation drive motor, and the rotation member. An adjustment shaft that is accommodated in the through hole so as to be movable in the axial direction and is coupled to the rotation output shaft of the radial adjustment motor such that the adjustment shaft cannot rotate relative to the rotation output shaft and is relatively movable in the axial direction. Adjustment axis rotation A feed screw mechanism that converts a rolling force into an axial movement force of the adjustment shaft itself, and a force conversion mechanism that converts the axial movement force of the adjustment shaft into a force that moves the displacement member in the rotation radius direction thereof. A whetstone dressing device characterized by being provided.