JPS5877444A - Internal surface grinder - Google Patents

Abstract

PURPOSE:To provide possibility of pushing out a grinding wheel in the fixed and radial directions even during revolutions, in a grinding wheel projection adjusting device for a honing machine under operation, by furnishing a differential gearing mechanism between the rotational driving shaft and grinding wheel. CONSTITUTION:When the projection of a grinding wheel 56 in the radial direction shall be adjusted, a fastening internal gear 32 is rotated in a case 4 by operating a handle. This rotation will cause a relative rotation of a gear for elevation and sinking 31 with respect to a shank 24 through a third planet gear 10 to shift compulsorily the fitting position of a boss 34 in a spiral groove 33 provided in the elevation/sinking mechanism 80, and thus the shank 24 moves in the axial direction to raise a projection adjusting member 41 with respect to the grinding wheel 56. Thus the grinding head 5 is released from its fast position. With this condition held, a worm gear 14 of a grinding wheel feed mechanism 70 is put in rotation to rotate the differential internal gear 12, and then the projection adjusting member 41 will make relative rotation to the grinding wheel holder 51 for adjustment of the projection of grinding wheel 56.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal grinding machine, and more particularly to an internal grinding machine in which the amount of protrusion of a grindstone along the radial direction of a spindle is adjusted.

An internal grinding machine has already been proposed in which the amount of protrusion of nine grinding wheels along the radial direction of the spindle can be adjusted while the spindle is rotating, that is, while the grinding machine is operating (Japanese Patent Application No. 56-0).
No. 54659, No. 56-054660).

With these internal grinding machines, the amount of protrusion of the grinding wheel is adjusted while it is still tightened, so it is not necessary to use a large amount of force to adjust the amount of protrusion. If the grinding wheel is tightened with too much force, adjustment becomes impossible, so it may not always be possible to tighten the grindstone with a force sufficient for high-precision grinding. As a result, vibration of the grindstone occurs during grinding, which may be undesirable in terms of grinding accuracy and life of the grindstone.

SUMMARY OF THE INVENTION An object of the present invention is to provide an internal grinding machine in which the amount of protrusion of the grinding wheel can be adjusted easily during operation, and the grinding wheel is firmly fixed at one end of the spindle except when adjusting the amount of protrusion of the grinding wheel. be.

The present invention provides a spindle connected to a rotational drive shaft, a plurality of grindstones disposed at one end of the spindle and movable along the radial direction of the spindle, and a feed mechanism in which the plurality of grindstones are directly or indirectly engaged. a protrusion amount adjusting member that is rotatable with respect to the spindle and movable along the center line direction of the spindle; a transmission mechanism that rotates the protrusion amount adjusting member in synchronization with the spindle; and a transmission mechanism that rotates the protrusion amount adjusting member in synchronization with the spindle; A differential mechanism that rotates the protrusion amount adjusting member relative to the spindle, a mysterious lifting mechanism that moves the protrusion amount adjusting member along the center line direction of the spindle and raises and lowers it relative to the grinding wheel, and a mechanism that is attached to a fixed part and rotates the spindle. A tightening mechanism that operates the lifting mechanism to tighten or release the tightening of the grindstone toward one end of the spindle, and a grindstone feeding mechanism that operates the differential mechanism while the spindle is rotating are provided, and the tightening mechanism is normally operated. Then, the protrusion amount adjusting member tightens the grindstone toward one end of the spindle to hold the strong mK grindstone. When adjusting the protrusion amount of the whetstone, operate the tightening mechanism to tighten the grindstone using the protrusion amount adjustment member. The amount of protrusion of the whetstone is adjusted by operating the differential mechanism using the grinding wheel feed mechanism and rotating the protrusion amount adjusting member relative to the spindle while releasing the tightening of the grinding wheel. The above objective is achieved by operating the tightening mechanism again to tighten the grindstone against one end of the spindle using the protrusion amount adjusting member so that the grindstone is firmly held.

Hereinafter, the present embodiment will be explained based on the drawings.

FIGS. 1 and 2 show an embodiment of an internal grinding machine according to the present invention.

In these figures, one end of a nine-rotation drive shaft 1 connected to the output shaft of a drive motor (not shown) is connected to the upper end of a spindle 3 via an Oldham coupling 2.

The spindle 3 is inserted through the center of a substantially inverted flower pot-shaped case body 4, which serves as a fixed part fixed to the spindle 3, and has a grindstone head 5 installed at its lower end.

In the front, a substantially cross-shaped rotating arm 6 is rotatably supported at a predetermined position in the case body 4 of the spindle 3, and a planetary shaft 1 is supported on each side of the rotating arm 6. has been done.

Planet @7Fi, a total of 4 installed around spindle 3.

These planetary shafts T are rotatably arranged on a virtual circumference centered on the spindle 3 via a rotating arm 6, with a distance between each other, and each of the planetary shafts 7 has a first to a third planetary gear. 8 to 10 are rotatably supported.

The driving gear 1 is located at a predetermined position of the grinding wheel head 5 from the mounting position of the rotary arm 6 in the spindle 30 case body 4.
1 is fixed, the first planetary gear 8 is meshed with this driving gear 11, and the differential internal gear 12 is engaged with the driving gear 11.
is engaged with.

The differential internal gear 12 is rotatable along the inner peripheral surface of the case body 4, and a rack portion 13 is carved on the outer peripheral edge of the differential internal gear 12. The worm gear 14 is meshed with the worm gear 14.

The rotation axis of the worm gear 140 is provided along the tangential direction at a predetermined position on the outer circumference O of the case body 4, and one end of the worm gear 14 is provided with a grip part 15 and a scale part 16], and a scale part 16t. - By visually operating the worm gear 14 by holding the grip 15, the differential internal gear 1 is
2 is configured to be rotated.

The second idler gear 3 is fixed to the inner periphery of the case body 4 and a transmission gear 21 located on the lower side of the driving wheel 11 in the drawing, and is meshed with a round fixed internal gear 22. Transmission gear 2
In the grindstone head 5 of No. 1, a cylindrical portion 23 is integrally formed with a transmission gear 21, and a spindle 3 is inserted through a cylindrical shank 24 inside the transmission gear 21 and the cylindrical portion 23. ing.

The fifth idle gear 10 is located below the transmission gear 21 in the figure and is a lifting gear 31 that is fitted onto the cylindrical portion 23.
and is meshed with a tightening internal gear 32 rotatably provided on the inner periphery of the case body 4. A spiral groove 33 is formed on the inner peripheral edge of the lifting gear 31, and a protrusion 34 fixed at a predetermined position of the shank 24 is slidably fitted into the spiral groove 33, so that the lifting gear 31 is connected to the shank 24. When the shank 24 is rotated relative to the lifting gear 31, the shank 24 is moved up and down with respect to the lifting gear 31.

The protrusion 34 is inserted into the spiral groove 33 after being loosely inserted into the insertion window 35 bored at a predetermined position of the cylindrical part 23.
However, the insertion window 35 is formed to have a predetermined length along the circumferential direction of the cylindrical portion 230 and a width that does not inhibit the elevation and descent of the protrusion 34 .

Further, when the cylindrical portion 23 is rotated, the protrusion 34 comes into contact with one end of the insertion window 35, and the inner peripheral surface of the transmission gear 21 and the cylindrical portion 23 and the outer peripheral surface of the shank 24 are brought into contact with each other. Even if it is not crimped, the transmission gear 210 rotations is the shank 2.
4 is ensured.

Note that a handle 3 is provided at a predetermined position of the tightening internal gear 32.
6 is provided in a protruding manner (see FIG. 1), and the tightening internal gear 32 is rotated by this handle 36 from the outside of the case body 4.

A lid 11s37 is attached to the lower opening of the case body 4, and the spindle 3 and the shank 24 protrude downward in the figure from the central hole 38 of the lid 37, and the shank 24 inside the central hole 38 Seal ring 39 around
is provided to prevent the lubricating oil inside the case body 4 from leaking.

The KH spindle 3 is inserted into the shank 24, and the spindle 3 is bent downward by a predetermined length from the lower end of the shank 24, and its central axis with the shank 24 is positioned at both ends of the shank 240.

A threaded portion is carved on the outer periphery of the lower end of the shank 24,
At this threaded portion, the protrusion amount adjustment member 41 of the grindstone head 5
However, the shank 24 and the protrusion amount adjusting member 41 are always rotated and raised and lowered together. The outer circumferential surface of the shank 24 and the inner circumferential surfaces of the transmission gear 21 and the cylindrical portion 23 are slidably pitted, and the protrusion adjustment member 41 is rotatable relative to the spindle 3 and within a predetermined range. The spindle 3 is movable along the center line direction of the spindle 3. First, this protrusion amount adjusting member 41 is formed into a substantially cylindrical shape, and has an insertion hole 43 bored in its center, and a feeding groove 44 as a feeding portion formed in its lower end surface.

On the other hand, a portion of the outer peripheral surface of the lower end of the spindle 3 that protrudes from the lower end of the shank 24 is formed into a tapered shape that becomes narrower in the same direction toward the lower end. A taper 1546 on the inner circumferential surface of the upper end of 45 is removably placed on a base.

A cylindrical protruding collar 1s48 integrally formed with nine threaded parts 47 is fixed to the lower end side of the cylindrical body 45.
A stop bolt ff'6 is inserted through the center of the spindle 3 upward along the center line of the spindle 3, and is screwed into a screw hole 4s drilled toward the lower end of the spindle 3. When tightened, the tapered portion 46 and the tapered outer circumferential surface of the spindle 3 are pressed together, and the rotation of the spindle 3 is transmitted to the cylindrical body 45.

The flange 48t; t is fitted into a circular groove 52 created on the lower end surface of the approximately cylindrical whetstone holding member 51, and five grooves are arranged at 120 degree intervals on an imaginary circumference centered on the spindle 3. It is fixed to the grindstone holding member 51 with fixing screws 53 (see FIG. 3).

A center hole 54 into which the cylindrical body 45 is inserted is bored in the center of the grindstone holding member 51, and a radial guide groove 55 is provided in the front upper end surface, as shown in FIG. There is.

The radial guide grooves 55 are open on the upper end side of the grindstone holding member 51, and three grooves are provided along the radial direction about the center hole 54 at intervals of 120 degrees.

A grindstone 56 in the shape of a rectangular parallelepiped is fitted into the radial guide groove 55 so that it can slide freely, and a bottle 57 is protruded from the upper end surface of the grindstone 56 at a predetermined position. It is set up. When the grindstone 56 is fitted into the radial groove 55, it can be suppressed toward the grindstone holding member 51 by the lower end surface of the protrusion amount adjusting member 41, and in the suppressed state, it is firmly held by the grindstone 51. .

Nine, the pin 57 of the whetstone 56 is slidably fitted into the feed groove 44 of the protrusion amount adjustment member 41, and when the protrusion amount adjustment member 41 and the whetstone holding member 51 are rotated relative to each other, the whetstone 56
The amount of radial protrusion is adjusted. That is, the feed groove 44
is formed in the shape of an Archimedean spiral or arc,
When the insertion position of the bottle 57 in the feed groove 44 is moved, the position of the grindstone 56 in the radial guide groove 55 is also moved accordingly.

In addition, 1. Second planetary gears 8, 9, differential internal teeth 12
, a transmission mechanism 60 that rotates the protrusion amount adjustment member 41 in synchronization with the spindle 3 by the fixed internal gear 22 and the transmission gear 21, and a differential mechanism BOA that rotates the adjustment member 41 relative to the spindle 3. The rack portion 13 of the differential internal gear 12 and the worm gear constitute the grindstone feeding mechanism 70 that operates during the rotation of the system binder 3, and the spiral groove 33 of the elevating gear 31 and the shank 24. The protrusion 34 constitutes an elevating mechanism 80 that moves the centering amount adjustment 1lii 141 along the direction of the center line of the spindle 3 and raises and lowers the adjusting member 41 with respect to the grindstone 56, and the third planetary gear 10. The tightening internal gear 32 and the handle 5liK constitute a tightening mechanism sO.

Next, the operation of this embodiment will be explained.

The rotation of the rotary drive shaft 10 is transmitted to the spindle 3 via the Oldham coupling 2, and the driving gear 11 is rotated. Even if there is a rotational runout in the rotary drive shaft 1, it is absorbed by the Oldham coupling 2, so the rotational runout is not transmitted to the spindle 3 and the driving gear 11.

During normal operation, the protrusion 34 is locked to a predetermined potential device in the spiral groove 33, and is firmly clamped between the grindstone holding member 51 and the grindstone 56 tube protrusion amount adjustment member 41 of the grindstone head 5. In this state, the inner surface of the workpiece is ground.

During grinding, the grinding wheel 56 is firmly held in the grinding wheel head 5, which is one end side of the spindle 3.
6, no vibrations or the like occur.

When the driving gear 11 rotates, the rotation arm 6 of the planetary gear mechanism configured around the driving gear 11 rotates, and the rotation of the driving gear 11, that is, the spindle 30 is integrally formed with the transmission gear 21 by the transmission mechanism 60. It is transmitted to the nine cylindrical portion 23 and further transmitted to the shank 24 through the protrusion 34 and the insertion 1135, so that the protrusion amount adjusting member 41 fixed to the lower end side of the shank 24 rotates in synchronization with the spindle 3. .

When adjusting the amount of protrusion of the grindstone 5B, first tighten the tightening mechanism 90.
The tightening internal gear 32 is attached to the case body 4 by operating the handle 36 of the
Rotate it inside. When the tightening internal gear 32 is rotated, the elevating gear 31 is rotated relative to the shank 24 via the third planetary gear 10, and the protrusion 34 in the spiral groove 33 of the elevating mechanism 8◎ is rotated. The insertion position of is forcibly moved. When the insertion position of the protrusion 34 is moved to a predetermined position, the shank 24 is moved upward in the figure, and accordingly the protrusion amount adjustment member 41 rises relative to the frame grindstone 56,
The grindstone 56 is firmly held by the protrusion adjustment member 41 and the grindstone holding member 51, and is released from the tightened state in the grindstone head S.

In this manner, in a state in which the grindstone 56 is loosened and loosened in the grindstone head 5, the scale portion 16t is operated and the grip portion 15 is rotated to rotate the worm gear of the grindstone feed mechanism 70 to drive the differential mechanism. 60A differential internal gear 12
is rotated within the case body 4. Differential internal gear 1
2 is rotated, the number of rotations of the rotating arm 60 changes, and the number of rotations of the transmission gear 21 changes accordingly. Therefore, the protrusion amount adjusting member 41 is rotated relative to the whetstone holding member 51, so that the whetstone The fitting position of the grindstone 56 in the radial guide groove 55 is changed to adjust the protrusion amount of the grindstone 56.

After the adjustment of the amount of protrusion of the grindstone 56 is completed, the lift mechanism 80 is operated again using the handle 36 of the tightening mechanism 90 to lower the protrusion amount adjustment member 41t to the grindstone 56 and press the grindstone 56. 56 is firmly tightened on the grindstone head 5.

This embodiment has the following effects.

Since the rotary drive shaft 1 and the spindle 3 are connected through the Oldham coupling 2t-, rotational runout on the rotary drive shaft 1 side is not transmitted to the spindle 3-, and grinding accuracy is improved.

During normal operation, the whetstone 56 is firmly tightened in the whetstone head 5, but when adjusting the protrusion amount of the whetstone 56,
C#) Since the tightening of the grindstone 56 is released, there is an effect that fine adjustment of the amount of protrusion can be made extremely smoothly. Moreover, since the grinding wheel 56 is firmly fixed during normal operation other than when adjusting the protrusion amount, there is no risk of vibrations occurring in the grinding wheel 56 during grinding, and the grinding accuracy is improved.
6's lifespan is also extended.

Furthermore, the amount of protrusion of the grindstone 56 can be adjusted during the 30 rotations of the spindle, that is, while the grinding machine is in operation, resulting in excellent rounding and workability.

First, the grinding wheel feed mechanism TOO differential internal gear 12 has the advantage of being easy to operate and finely adjust due to its rounding operation, which is rotated by the rack portion 13 and the worm gear 14.

In the above-described embodiment, it is assumed that the rotary drive shaft 1 and the spindle 3 are connected via the Oldham coupling 2, but it is assumed that a universal joint or vibration-proof rubber is used in addition to the Oldham coupling. They may be directly connected to each other.

First, in the above-described embodiment, the wire clamping is structured so that the entire grinding wheel head 5 can be removed from the spindle 3 and the shank 24 by tightening the ring 42 and removing the fixing bolt 50. However, the grindstone head 5 does not have to be removable. However, if the grindstone head 5 can be removed, it becomes possible to replace and use various grindstone heads depending on the purpose of grinding, such as the size of the workpiece.

Furthermore, a planetary gear mechanism is constructed around the driving gear 11, and the transmission mechanism 6◎, the differential mechanism 60A, etc. act on this planetary gear mechanism without interfering with each other.
The transmission mechanism 60 and the like are not limited to the planetary gear mechanism, but may be constructed from other mechanisms.

In the above-described embodiment, the grinding wheel 56 is directly tightened or released at one end of the spindle 3 as the shank 24 moves up and down based on the locking position of the protrusion 34 in the spiral groove 33. However, a spring or the like may be provided as a biasing means in any part of the elevating mechanism 80 or the tightening mechanism 90, and the biasing force of the spring or the like may be utilized when tightening the grindstone 56.

As described above, according to the present invention, there is provided an internal grinding machine in which the amount of protrusion of the grinding wheel can be adjusted easily during operation, and the grinding wheel is firmly fixed at one end of the spindle except when adjusting the amount of protrusion of the grinding wheel. can be provided.

[Brief explanation of drawings]

FIG. 1 is a front view showing the configuration of an embodiment of an internal grinding machine according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. FIG. 4 is an exploded perspective view showing the main parts, and FIG. 4 is a perspective view showing the shape of the grindstone holding member in the embodiment. 1...Rotation drive shaft, 2...Oldham coupling,
3゛・°spindle, 4... Case body as a fixed part, 6... Rotating arm, 7... Planetary shaft, 8.9.10
・・・1st゜2nd. Third planetary gear, 11... Driving gear, 12... Differential internal gear, 13... Rack, 1
4... Worm gear, 21... Transmission gear, 22...
...Fixed internal gear, 24...Shank, 32...Tightening internal gear, 36...Handle, 41...Protrusion amount adjustment member, 44...Feed groove as feed 9 part, 51... Grindstone holding member, 56... Grindstone, 60... Transmission mechanism, 60
A... Differential mechanism, 70... Grindstone feeding mechanism, 80...
- Lifting mechanism, 90...tightening mechanism. Agent: Patent Attorney Minoru Kinoshita Figure 3 Figure 4

Claims (1)

[Scope of Claims] (1) A spindle connected to a rotational drive shaft, a plurality of grindstones arranged at one end of the spindle and movable along the radial direction of the spindle, and a plurality of grindstones that are directly or indirectly connected to each other. a protrusion amount adjusting member in which a feeding portion to be engaged is formed and is rotatable with respect to the spindle and movable along the center line direction of the spindle; and a transmission device that rotates the protrusion amount adjusting member in synchronization with the spindle. , a differential mechanism for rotating the protrusion amount adjusting member relative to the spindle; and an elevating mechanism for moving the protrusion amount adjusting member along the center line direction of the spindle to raise and lower the protrusion amount adjusting member with respect to the grindstone. a tightening mechanism that is attached to a fixed part and operates the elevating mechanism while the spindle is rotating to tighten or release the tightening of the grindstone toward one end of the spindle; and a grindstone feeding mechanism that operates the differential mechanism while the spindle is rotating. An internal grinding machine characterized in that the grinding wheel is tightened and loosened and the protrusion amount is adjusted while the spindle is rotating. (2) In claim 1, a driving gear is fixed to a predetermined position of the spindle, and a plurality of planetary shafts each supporting a first to third planetary gear are connected to each other via a rotating arm. is arranged rotatably on an imaginary circumference centered on the spindle, is meshed with the first planetary tooth expansion drive gear and the differential internal gear of the grindstone reduction mechanism, and is engaged with the second
The idler gear 1 is arranged to transmit the rotation of the drive gear to the protrusion adjustment member, the third planetary gear is engaged with the lifting mechanism, and the transmission mechanism, the differential mechanism, and the lifting mechanism An internal grinding machine characterized in that it is integrally constructed by an idler gear mechanism having a third planetary gear without interfering with each other. (8) In claim 1 or 2,
An internal grinding machine characterized in that the spindle is connected to a rotational drive shaft via an Oldham coupling.