JPH0357416Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in a honing device used for polishing the inner surface of a relatively long hole with high precision.

(Prior Art) Conventionally, as this type of honing device, one having a structure shown in FIG. 3, for example, has been known.

This is a vertical honing device 50, which includes a horn head 51, a plurality of grindstone heads 52 disposed so as to be movable in the centrifugal direction with respect to the honing device 50, a grindstone 53 attached to these, and a grindstone 53 that is movable in the axial direction inside the horn head 51. a cone 54 that is capable of moving each grinding wheel head 52 in a centrifugal direction synchronously; and a horn head 5.
A hollow shank bar 55 is connected to the shank bar 1, a drive shaft 56 is connected to the hollow shank bar 55, and is rotated and moved in the axial direction. Its main part is composed of a push rod 57 that is pushed in the axial direction.

Therefore, the horn head 51 and the shank bar 55
Between the shank bar 55 and the drive shaft 56, universal joints 60 and 61 are provided, respectively, with through holes 58 and 59 into which a push rod 57 can be loosely fitted.

Therefore, the horn head 51 can be moved parallel to the drive shaft 56 by the universal joints 60 and 61, and can be made to accurately follow the prepared hole of the workpiece.

However, in such a honing device 50, since each of the universal joints 60, 61 swings, there is a problem in that the honing device 50 follows the prepared hole of the workpiece more than necessary.

In other words, there is no problem if the axial center line of the drive shaft and the axial center line of the pilot hole match or are parallel, but if the axial center line of the pilot hole is even slightly inclined to the axial center line of the drive shaft. In some cases, it has not been possible to modify this to create a finished hole with an axis aligned with or parallel to the axis of the drive shaft.

Also, unlike general joints, the universal joints 60 and 61 have a push rod 5 at their axis.
Since through-holes 58 and 59 must be provided for loosely fitting 7, the structure is complicated and the cost is high.

For this reason, there was also a problem that the product price of the honing device 50 was high.

(Problems that the invention attempts to solve) This invention was created in view of the problems mentioned above and to solve them, and its purpose is to:
To provide a honing device which prevents excessively following the prepared hole of a workpiece and reduces the product price.

(Means for solving the problem) The honing device of the present invention includes a horn head,
A plurality of grindstone stands movable in the centrifugal direction with respect to the horn head, a grindstone attached to each grindstone stand,
A cone that is installed movably in the axial direction inside the horn head and moves each grinding wheel head synchronously in the centrifugal direction; a hollow shank bar that is connected to the horn head; and a cone that is connected to the shank bar to rotate and move in the axial direction. In a honing device that includes a drive shaft and a push rod that is inserted into the interior extending from the horn head to the drive shaft, its tip is connected to the cone, and is pushed in the axial direction, between the honing and the shank bar, The Oldham type joint is provided with a plurality of retaining sliding parts that cannot be disengaged in the axial direction and is capable of relative movement in the diametrical direction, and in which the sliding directions of the respective retaining sliding parts are different from each other. A feature lies in that an axial through-hole is bored in the axis of each of the sliding prevention parts, and the middle of the push rod is loosely fitted into the through-hole.

(Operation) When the drive shaft is rotated and moved in the axial direction, this power is transmitted to the grinding wheel via the shank bar, Oldham joint, horn head, and grinding wheel head, and the pilot hole of the workpiece is polished to a high precision finish. be done.

When the push rod is pushed, its power is
It is transmitted to the grinding wheels via the cone and the grinding wheel head, and each grinding wheel moves synchronously in the centrifugal direction, resulting in a large polishing stock.

If the axial center line of the pilot hole is offset parallel to the axial center line of the drive shaft, the horn head can be rotated and rotated while moving parallel to the drive shaft and shank bar by the amount of the offset using the Oldham type joint. axially moved.

If the axial center line of the prepared hole is slightly inclined with respect to the axial center line of the drive shaft, the relative sliding of the multiple retaining sliding parts of the Oldham type joint will be affected by the slight deviation caused by the inclination. The horn head is rotated and moved in the axial direction while moving parallel to the drive shaft and shank bar due to the motion, and by repeated polishing, the finished hole is made with an axis line that matches or is parallel to the axis line of the drive shaft. I can do things.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a side view showing a half of a honing device according to an embodiment of the present invention. FIG. 2 is a perspective view showing the structure of the Oldham type joint.

The main parts of the honing device 1 include a horn head 2, a grindstone head 3, a grindstone 4, a cone 5, a shank bar 6, a drive shaft 7, a push rod 8, and an Oldham joint 9.

The horn head 2 has a hollow shape, and guide grooves 10 are cut radially from the inside at equal angular positions on the circumference, and in this example, four guide grooves 1 are formed every 90 degrees.
0 is set.

A plurality of grindstone heads 3 are provided so as to be movable in the centrifugal direction with respect to the horn head 2, and are fitted into guide grooves 10 of the horn head 2.

The whetstone 4 is attached to each whetstone head 3, and is, for example, a diamond whetstone or the like, and is integrally attached to the outer surface of the whetstone head 3 using an adhesive or the like.

The cone 5 is provided inside the horn head 2 so as to be movable in the axial direction, and moves each grindstone head 3 synchronously in the centrifugal direction.

In this example, it has a shape in which two cones are arranged side by side, and two inclined surfaces that fit the two cones are formed on the inner surface of each grindstone head 3, and the advancement of the cone 5 (as shown in FIG. Each grinding wheel head 3 is moved synchronously in the centrifugal direction by moving the cone 5 backward, and each grinding wheel head 3 is also moved synchronously in the centripetal direction by the retreat of the cone 5. At the front and rear, there are elastic bodies 1 such as O-rings and loop-shaped coil springs that urge these to move in the centripetal direction.
1 is provided.

The shank bar 6 is hollow and connected to the horn head 2, and has a predetermined length.

The drive shaft 7 is connected to the shank bar 6 and is rotated and moved in the axial direction.

In this example, it has a hollow shape and is connected to the shank bar 6 via a quick joint 12, to which a rotary drive machine (not shown) such as an electric motor is connected, and a reciprocating device such as a fluid pressure cylinder is connected to the shank bar 6. A drive machine (not shown) is linked.

The push rod 8 is inserted into the interior extending from the horn head 2 to the drive shaft 7, and its tip is connected to the cone 5.
It is connected to and pushed in the axial direction.

In this example, the cone 5 and the push rod 8 are screwed together, and a pusher S such as a fluid pressure cylinder is connected to the base end of the push rod 8, and between the shank bar 6 and the push rod 7, An elastic body 13 such as a coil spring that biases the push rod 7 toward the proximal end (to the right in FIG. 1).
has been intervened.

The Oldham type joint 9 is interposed between the horn head 2 and the shank bar 6, and is provided with a plurality of retaining sliding parts 14 that cannot be disengaged in the axial direction and are movable relative to each other in the diametrical direction. The sliding directions of the respective retaining sliding parts 14 are different from each other, and an axial through-hole 15 is formed in the axis of these parts.

In this example, a case is illustrated in which there are two retaining sliding parts 14, and each retaining sliding part 14 is composed of a diametrical dovetail 16 and a matching dovetail groove 17, as shown in FIG. are doing.

In other words, the intermediate joint 18 is interposed between the horn head 2 and the shank bar 6, the first slipping prevention sliding portion 14 is provided between the horn head 2 and the intermediate joint 18, and the first sliding portion 14 is provided between the intermediate joint 18 and the shank bar 6. A second anti-sliding portion 14 is provided between the two.

The first slip-out prevention sliding portion 14 includes a dovetail 16 formed on the horn head 2 and a dovetail groove 1 formed on the intermediate joint 18.
7, and the second retaining sliding part 14 is constructed by a dovetail groove 17 formed in the intermediate joint 18 and a dovetail 16 formed in the shank bar 6, and both retaining sliding parts 14, 14 The sliding directions of are arranged to be orthogonal to each other.

Therefore, the axis of the two retaining sliding parts 14, 14,
That is, dovetail 16, dovetail groove 17, dovetail groove 17, dovetail 1
A through hole 15 in the axial direction is bored in each of the axes 6 .

The two retaining sliding parts 14, 14 each have a dovetail 16.
By fitting the dovetail grooves 17 with the dovetail grooves 17, it is possible to make relative movement in the diametrical direction while making it impossible to disengage in the axial direction, and the middle of the push rod 8 is loosely fitted into these through holes 15.

Next, the operation will be explained based on such a configuration.

When operating a rotary drive machine and a reciprocating drive machine,
Each power is driven by the drive shaft 7→quick joint 12→
It is transmitted to the grindstone 4 via the shank bar 6 → Oldham joint 9 → horn head 2 → grindstone head 3, and the prepared hole of the workpiece is polished with high precision.

When the pusher S is operated, the power is transferred to each grinding wheel 4 via the push rod 8 → cone 5 → grinding wheel head 3.
, which moves synchronously in the centrifugal direction,
The polishing allowance becomes large.

When the axial center line of the drive shaft 7 and the axial line of the pilot hole match, the horn head can be removed with the axial center line of the drive shaft 7 and shank bar 6 and the axial center line of the horn head 2 aligned as shown in Fig. 1. 2 is rotated as well as axially displaced.

If the axial center line of the drive shaft 7 and the axial center line of the pilot hole are deviated in parallel, the drive shaft 7 and the shank bar 6
The horn head 2 is rotated and moved in the axial direction while being translated in parallel by the amount of deviation.

If the axial center line of the prepared hole is slightly inclined with respect to the axial center line of the drive shaft 7, the two slip-out prevention sliding parts 14 of the Oldham type joint 9 will be moved by the slight deviation caused by the inclination. As a result, the horn head 2 is rotated and moved in the axial direction while moving parallel to the drive shaft 7 and the shank bar 6, and by repeating polishing, it is finished with an axial center line that matches or is parallel to the axial center line of the drive shaft 7. It can be made into a hole.

In other words, the prepared hole of the workpiece can be polished while making corrections to obtain a predetermined finished hole.

The movement of the Oldham type joint 9 is slight, and since the push rod 8 is loosely fitted into the through hole 15 of the Oldham type joint 9, the movement of the Oldham type joint 9 is not hindered.

When the honing device 1 becomes free from the pilot hole of the workpiece, the push rod 8 is loosely fitted into the through hole 15 of the Oldham type joint 9, so that it will not be accidentally separated from there.

In the previous embodiment, the horn head 2 was not provided with a guide at its tip, but the present invention is not limited to this, and the horn head 2 may be provided with one such as the conventional one shown in FIG.

Although the number of grindstone heads 3 was four in the previous embodiment, the number is not limited to this, and may be six, for example.

Although the whetstone 4 was a diamond whetstone in the previous embodiment, it is not limited to this, and may have properties that correspond to the workpiece.

In the previous embodiment, the push rod 8 was a single push rod, but the push rod 8 is not limited to this, and may be divided at appropriate locations as in the conventional push rod shown in FIG.

In the previous embodiment, the Oldham type joint 9 had two anti-sliding portions 14, but the present invention is not limited to this, and there may be three or more. In this case, it is desirable that the sliding directions of the respective anti-sliding parts 14 be set at different angles at equal angles.

In the previous embodiment, each slip-out sliding portion 14 of the Oldham type joint 9 has a dovetail 16 and a dovetail groove 17, but it is not limited to this, and may have any other shape that allows slip-out sliding.

In the previous embodiment, each slip-out prevention sliding part 14 of the Oldham type joint 9 was arranged as a dovetail, a dovetail groove, a dovetail groove, and a dovetail, but the arrangement is not limited to this, for example, a dovetail groove,
It may be an arrangement of dovetails, dovetails, and dovetails.

In the previous embodiment, the Oldham type joint 9 was configured to include parts of the horn head 2 and the shank bar 6, but it is not limited to this, and for example, it can be configured as a single item and both ends of the joint are connected to the horn head 2 and the shank bar 6, respectively. There is no problem in connecting them.

(Effects of the invention) As described above, according to the present invention, the following excellent effects can be achieved.

(1) An Oldham type joint that only allows parallel movement is provided between the horn head and the shank bar, which prevents it from following the prepared hole of the workpiece too much compared to a conventional universal type joint. I can do things.

Therefore, even if the axial center line of the prepared hole of the workpiece is slightly inclined with respect to the axial center line of the drive shaft, this can be corrected to obtain a properly finished hole.

(2) An Oldham type joint with a plurality of anti-sliding parts that only allow parallel movement between the horn head and the shank bar is inserted, so the structure is different from the pivot structure of conventional universal type joints. is easy.

Therefore, the cost itself is not increased, and the product price of the honing device as a whole can be reduced.

(3) Since an Oldham type joint that only allows parallel movement is provided between the horn head and the shank bar, there is no need to provide two universal type joints as in conventional honing equipment, and the number of joints can be reduced accordingly. The product price of the entire honing device can be further reduced.

(4) Since the middle of the push rod is loosely fitted into the through hole of the Oldham type joint, the Oldham type joint can be assembled at the same time as the honing device is assembled.
Assembly is easy.

(5) Since the push rod is loosely fitted into the through-hole of the Oldham type joint and is used as a so-called honing device, the number of components required for the Oldham type joint can be reduced, and the number of components required for the Oldham type joint can be reduced. It is possible to reduce the overall cost.

(6) Since an Oldham type joint is provided between the horn head and the shank bar, only the parts after the horn head that are necessary for polishing can be quickly translated in parallel, allowing the pilot hole to be polished properly and with high precision. You can finish it.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a half of a honing device according to an embodiment of the present invention. FIG. 2 is a perspective view showing the structure of the Oldham type joint. FIG. 3 is a side view showing a half of a conventional honing device in longitudinal section. 1... Honing device, 2... Horn head,
3...Whetstone head, 4...Whetstone, 5...Cone, 6...
...Shank bar, 7...Drive shaft, 8...Push rod, 9...Oldham type joint.

Claims (1)

[Scope of utility model registration request] A horn head, a plurality of grindstone heads disposed so as to be movable in the centrifugal direction with respect to the horn head, a whetstone attached to each whetstone head, and a whetstone mounted inside the horn head so as to be movable in the axial direction to synchronously centrifugally move each whetstone head. a cone to be moved in the direction; a hollow shank bar connected to the horn head; and a drive shaft connected to the shank bar to rotate and move in the axial direction;
In a honing device that includes a push rod that is inserted into the interior from the horn head to the drive shaft, its tip is connected to the cone, and is pushed in the axial direction, there is an axial release between the horn head and the shank bar. An Oldham type joint is provided which is provided with a plurality of retaining sliding parts that cannot be moved and can move relative to each other in the diametrical direction, and in which the sliding directions of the respective retaining sliding parts are different from each other. A honing device characterized in that an axial through hole is bored in the axis of the moving part, and the middle of the push rod is loosely fitted into the through hole.