JPH10138119A - Grinding stone holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding stone holder that can hold a grinding stone stably while being heightened in rigidity. SOLUTION: A holder 18 for a horn applied to a honing head is provided with a holder body having a horn fitting face 26 and a pair of protrusions 28, 30, a movable holding part 36 partitioned by a U-shape expanding slot 34 at the center part of the holder body and partially including one protrusion 28 while being elastically deformable toward the other protrusion 30, and a pair of clamp screw 42 drawing the movable holding part 36 toward the protrusion 30 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a grindstone holder for holding a grindstone used for grinding or honing.

[0002]

[Related Background Art] A honing machine is provided with a honing head in which a plurality of horns (grinding stones) are mounted via a grinding stone holder. The inner surface is ground up. For example, one example of a honing head is disclosed in JP-A-5-57598 and JP-A-5-84654, respectively.

[0003] In this type of honing head, the horn is attached to the grindstone holder by directly bonding the horn to the grindstone holder or by forming the grindstone holder into a two-piece structure and holding the horn between them. It is done in. In the case of the former bonding, the horn is not easily exchanged for the grindstone holder. Therefore, considering the horn exchange, the latter two-piece type grindstone holder is excellent.

For example, as shown in FIG. 4, the grindstone holder has a two-piece structure including a holder body a and a holding plate b. The holding plate b is removed from the holder body a through a plurality of screws c. It is possible and connected. Therefore, the horn e is placed on the grindstone mounting surface d formed by the holder body a and the holding plate b, and the horn e is held between the holder body a and the holding plate b by tightening the screw c. be able to.

[0005]

However, in the above-described two-piece type grindstone holder, the holder body a
Since the recess for receiving the holding plate b must be formed, the section modulus of the holder body a decreases, and the rigidity of the holder body a decreases accordingly. Also, the holding plate b
Has a thin plate shape, and if the holding plate b is warped, the hole e cannot be stably held. Furthermore,
Since the holder main body a and the holding plate b must be obtained by processing each, the cost of the grindstone holder also increases.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to increase rigidity and stably hold a horn, and
An object of the present invention is to provide a grindstone holder which is advantageous in terms of cost.

[0007]

SUMMARY OF THE INVENTION The above object is achieved by the present invention, and a whetstone holder according to claim 1 is integrally formed along a whetstone mounting surface and both sides of the whetstone mounting surface so that a whetstone can be fitted thereto. A holder body having a pair of ridges, a movable holding portion formed integrally with the holder body via a split groove, and a part of one ridge being elastically deformable toward the other ridge side; Attraction means for attracting the movable holding portion to the other ridge on the holder body side is provided.

According to the first aspect of the present invention, after the grindstone is mounted on the grindstone mounting surface in a state where the grindstone is fitted between the pair of protrusions of the holder body, the movable holding portion is moved to the holder body side by the attracting means. When attracted, the grindstone on the grindstone mounting surface is clamped between the ridge portion of the movable clamping portion and the ridge of the holder body. In the whetstone holder of the second aspect, the movable holding portion is formed on the holder main body while leaving both end portions of one of the protrusions. In this case, the whetstone mounted on the whetstone mounting surface is fitted between the remaining ridge on one side of the holder main body and the other ridge left on both ends of the movable holding portion. Therefore, when the movable holding portion is attracted, the grindstone on the grindstone mounting surface is stably held.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a part of a honing machine, that is, a honing head 2 is shown.
The honing head 2 has a head body 4 having a hollow cylindrical shape. The head main body 4 is connected to a hollow main shaft (not shown) of the honing machine, is rotatable in the arrow direction X shown in FIG. 1 with the rotation of the main shaft, and is capable of moving up and down together with the main shaft.

An expanded cone 6 having a two-stage structure is arranged concentrically on the cylindrical portion of the head body 4, and the expanded cone 6 has conical portions 8 and 10 at the top and bottom as viewed in FIG. The tapered surfaces of the conical portions 8 and 10 face downward, respectively, and a predetermined interval is secured between the conical portions 8 and 10. A connecting rod 12 extends upward from the expansion cone 6 and extends within the head main body 4 and the main shaft. The connecting rod 12 is connected to a vertical movement mechanism (not shown) built in the main shaft. This vertical movement mechanism can move the connecting rod 12 up and down in the Y direction in FIG. 1, whereby the axial position of the expansion cone 6 with respect to the head body 4 is adjusted. The vertical movement mechanism moves up and down together with the main shaft.

On the other hand, a plurality of mounting slots 14 are formed at the lower end of the head main body 4, and these mounting slots 14 are arranged at equal intervals in the circumferential direction of the head main body 4. A tool unit 16 is slidably and detachably mounted in the mounting slot 14 in the radial direction of the head body 4 so as to be slidable and removable. The tool unit 16 includes a horn (grinding stone) G and a holder 18 thereof. .
The holder 18 has an outer peripheral shape corresponding to the horn slot 14, and a horn G is attached to an outer surface thereof so as to protrude from the head main body 4. On the other hand, the inner surface of the holder 18 is provided with protrusions 20 and 22 which are vertically separated from each other. The protrusions 20 and 22 have a tapered tip, and the conical portions 8 and Each has a slanted edge 24 that abuts on 10. Therefore, when the expanding cone 6 is lowered with respect to the head main body 4 by the above-described vertical movement mechanism from the state shown in the figure, the conical portions 8 and 10 of the expanding cone 6 become the holders 18, that is, the tool units 16.
Is pushed outward in the radial direction of the head body 4, whereby the amount of projection of the horn G in each tool unit 16, that is, the amount of expansion is adjusted.

When the above-mentioned honing head 2 rotates and moves up and down over the entire length of the hole in the hole of the workpiece (not shown), each horn G pressed against the inner surface of the hole with a predetermined pressing force is applied to the inner surface of the hole. Can be precisely ground. As shown in more detail in FIGS. 2 and 3, the holder 18 of the tool unit 16 is provided with the protrusions 20 and 2 described above.
4 has a rectangular horn mounting surface 26, and ridges 28 and 30 are integrally formed on both sides of the horn mounting surface 26. The ridges 28 and 30 extend in parallel with each other, and the interval between the ridges 28 and 30 is set to be equal to the width of the horn G. Accordingly, when the horn G is placed on the horn mounting surface 26, the horn G is fitted between the pair of ridges 28, 30. In this embodiment, the outer surfaces of the pair of ridges 28 and 30 are the holder 1
8, an extension of the outer peripheral surface is formed. Further, the length of the pair of ridges 28, 30 and the horn mounting surface 26 is set to be the same as the length of the horn G.
At both ends of the groove 8, a pair of ridges 28, 30 and a groove 32 for defining the length of the horn mounting surface 26 are formed.

The horn mounting surface 26 is formed with a U-shaped split groove 34 that opens toward one of the ridges 28. The split groove 34 is located at the center of the horn mounting surface 26 in the longitudinal direction, and divides the ridge 28 at two places. Therefore, the split groove 34 divides the holder 18 into a holder main body on the other ridge 30 side and a portion surrounded by the split groove 34. Here, a split groove 34 parallel to the pair of ridges 28 and 30 is provided.
Is one ridge 28 from the center of the horn mounting surface 26.
And the split groove 34 is formed over a predetermined depth. Therefore, the portion surrounded by the split groove 34 is configured as a movable holding portion 36 elastically deformable toward the protrusion 30, that is, having a spring property.
6 has a rectangular shape extending in the longitudinal direction of the horn mounting surface 26. The dividing grooves 34 can be obtained by electric discharge machining or lost wax molding.

Further, a pair of screw holes 38 are formed on the outer side surface of the movable holding portion 36, and these screw holes 38 are arranged at equal distances from both ends of the movable holding portion 36, That is, it is open in the split groove 34. On the other hand, on the outer peripheral surface of the holder 18, that is, on the outer peripheral surface of the holder main body located on the side opposite to the movable holding portion 36, stepped insertion holes 40 are formed coaxially with the screw holes 36, respectively. The holes 40 communicate with the corresponding screw holes 38 via the split grooves 34. Therefore, the fastening screw 42 can be screwed into each screw hole 38 through the insertion hole 40.

When the horn G is mounted on the holder 18, the horn G is first placed on the horn mounting surface 26 of the holder 18. At this time, the horn G has a pair of ridges 2
8 and 30, both sides of which are paired with a pair of ridges 28,
It is sandwiched between 30. In this state, when the tightening screws 42 are screwed into the respective screw holes 38 through the pair of insertion holes 40, the movable holding portion 36 becomes
The protrusions 28 on the movable holding portion 36 are attracted to the zero side.
Part presses the side surface of the horn G. As a result, the horn G on the horn mounting surface 26 is firmly held between the pair of ridges 28 and 30, whereby the mounting of the horn G on the holder 18 is completed. The screwing of the fastening screw 42 is performed until its head is completely immersed in the insertion hole 40, and a part of the fastening screw 42 does not project from the outer peripheral surface of the holder 18. After that, in order to remove the horn G from the holder 18, if the fastening screw 42 is loosened, the protrusion of the movable holding portion 36 is released, and the horn G can be removed from the horn mounting surface 26. .

According to the holder 18 described above, since the movable holding portion 36 is integral with the holder main body, the section modulus of the holder 18 itself is greatly increased as compared with a conventional two-piece holder, and Rigidity can be increased. Therefore, at the time of honing, the horn G held by the holder 18 can grind up the inner surface of the hole of the workpiece with high precision.

When the horn G is mounted on the holder 18, the horn G on the horn mounting surface 26 and both ends of the ridge 28 in the area other than the movable holding portion 36 and the ridge 30
The movable holding portion 36
The horn G can be stably held only by the attraction, which also greatly contributes to the improvement of the processing accuracy.

Further, since the movable holding portion 36 is integrated with the holder 18, the holder main body and the movable holding portion 36 are processed and formed at the same time. Accordingly, the number of processing steps required for forming the holder 18 is greatly reduced, and the holder 18 can be obtained at a low cost. The present invention
The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the number of the movable holding portions 36 is not limited to one, and two or three movable holding portions 36 may be provided in the holder 18, and the number is not limited. Further, the present invention is not limited to being applied only to the holder of the tool unit in the honing machine, but is similarly applicable to a holder for holding a disk-shaped grindstone.

[0019]

As described above, according to the grinding wheel holder of the first aspect, since the holder main body and the movable holding portion are integrally formed, the section modulus of the grinding wheel holder is increased, and the rigidity thereof is increased. it can. In addition, only by attracting the movable holding portion, the grindstone on the holder main body can be reliably held, and high-precision machining with the grindstone becomes possible. According to the whetstone holder of claim 2, since the whetstone on the holder main body is fitted between one of the ridges left on both sides of the movable holding portion and the other ridge, the whetstone is movable. There is no displacement of the grindstone due to the attraction of the holding portion, and an excellent effect such as stable holding of the grindstone is achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a part of a honing head in a honing machine.

FIG. 2 is an exploded perspective view showing a tool unit according to one embodiment.

FIG. 3 is a sectional view showing the holder of FIG. 2;

FIG. 4 is a schematic sectional view showing a conventional two-piece type grindstone holder.

[Explanation of symbols]

 18 Holder 26 Horn mounting surface (grinding wheel mounting surface) 28, 30 Ridge 34 Split groove 36 Movable holding part 42 Tightening screw (pulling means) G Horn (grinding stone)

Claims (2)

[Claims] 1. A holder body having a pair of ridges integrally formed along both sides of a whetstone mounting surface and the whetstone mounting surface and capable of fitting a whetstone, and integrally with the holder body via a split groove. A movable holding portion formed and capable of elastically deforming a part of one of the protrusions toward the other protrusion; and an attraction for attracting the movable holding portion to the other protrusion on the holder body side. And a grinding wheel holder. 2. The whetstone holder according to claim 1, wherein the movable holding portion is formed leaving both end portions of the one ridge.