JPH08155826A - Honing method and honing head used in this method - Google Patents

Abstract

PURPOSE: To provide a honing method and a honing head used in this method capable of conducting uniform honing of the inner peripheral surface of a machined hole even in the case of the machined hole of a workpiece having high rigidity parts and low rigidity parts. CONSTITUTION: Honing stick shoes 11 provided in the radially movable state at a honing head 1 is opened outward, and honing sticks 9 provided at the honing stick shoes 11 are brought into pressure contact with the inner peripheral surface of a machined hole H to perform honing. At this time, the honing sticks 9 are supported movably in the radial direction through elastic bodies 25 to perform honing. The honing sticks 9 are directly or indirectly fitted to the outside of the honing stick shoes 11, provided in the radially movable state at the honing head 1, through the elastic bodies 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honing method for honing a hole to be machined in a workpiece and a honing head used in the method. More specifically, the present invention relates to a honing head provided movably in a radial direction. When performing the honing process by pressing the grindstone provided in the grindstone shoe to the inner peripheral surface of the processing hole, the method of performing the honing process by pressing the grindstone through the elastic body and the grindstone through the elastic body in the grindstone shoe The present invention relates to a honing head having an attached structure.

[0002]

2. Description of the Related Art A conventional honing head has a structure as disclosed in, for example, Japanese Patent Laid-Open No. 61-86171 (hereinafter simply referred to as a prior art).

That is, as shown in FIG. 5, a conventional honing head 1 is used by being detachably attached to a lower end of a spindle 3 which is vertically movable and rotatable on a honing machine (not shown). The honing head 1 is a cylindrical head body 5 having an attachment portion 5A to the lower end portion of the spindle 3 at the upper portion.
In the plurality of slits 7 formed at appropriate intervals in the circumferential direction of the head body 5, a grindstone shoe 11 having a grindstone 9 on the outside is mounted so as to be movable in the radial direction (radial direction). is there. Each whetstone shoe 11 is biased and held inward by springs 12 wound around both upper and lower ends.

On the outer peripheral surface of the head body 5, a plurality of guide members 13 for guiding the head body 5 in the axial direction (vertical direction in FIG. 5) with respect to the processed hole H of the workpiece W are appropriately circumferentially arranged. Installed at intervals. The appropriate guide member 13 is provided with the air nozzle 4 as a measuring unit of the air micrometer.

Further, in the head body 5, a rod 17 having a taper portion 15 for pressing the grindstone shoe 11 outwardly against the spring 12 is vertically movable. The rod 17 is always urged and held in the upward direction by a spring 19 mounted elastically between a flange portion provided on the upper end and the head body 5.

In the above construction, after the honing head 1 is properly attached to the lower end portion of the spindle 3 in the honing machine, the honing head 1 is inserted into the machining hole H of the workpiece W and the spindle 3 is attached. It rotates and moves up and down, and further supplies hydraulic oil to the hydraulic cylinder 21 provided on the spindle 3 to lower the piston 23.

When the piston 23 is lowered as described above, the piston rod 23R provided integrally with the piston 23 is provided.
Moves the rod 17 downward against the spring 19. Therefore, the grindstone shoe 11 is moved outward by the taper portion 15 provided on the rod 17, and the grindstone 9 is positioned at a predetermined position immovably on the outer side of the grindstone shoe 11 so that the grindstone shoe 11 is formed on the inner peripheral surface of the machining hole of the workpiece W. Pressed. In this manner, the honing head 1 is rotated and moved up and down in a state where the grindstone 9 is pressed against the inner peripheral surface of the machined hole H, whereby the machined hole H is honed.

[0008]

As described above, when the grindstone 9 is brought into contact with the inner peripheral surface of the machined hole of the workpiece W to perform the honing process, the rigidity is changed depending on the location due to a difference in wall thickness around the machined hole H, for example. , The surface pressure of the grindstone 9 becomes high in a place with high rigidity and the amount of cutting (grinding) increases, and the place in which rigidity is low tends to deform and escape from the work piece. The surface pressure of No. 9 becomes low and the grinding amount becomes small.

Therefore, in the conventional structure, when there are portions having different rigidity in the machined hole of the workpiece, the machined hole has a large amount of grinding and a small amount of grinding, and the machined hole is machined into an elliptical shape as a whole. However, it was impossible to machine a more accurate round circle.

[0010]

The present invention has been made in view of the conventional problems as described above, and the honing method of the present invention described in item 1 is provided on the honing head so as to be movable in the radial direction. When the honing process is performed by expanding the grindstone shoe outward and pressing the grindstone provided for the grindstone shoe to the inner peripheral surface of the processing hole, the grindstone is moved in the radial direction through the elastic body. It is a honing method that supports honing as much as possible.

The honing head according to the second aspect of the present invention has a construction in which a grindstone is directly or indirectly attached to the outside of a grindstone shoe provided on the honing head so as to be movable in the radial direction, via an elastic body. is there.

The invention according to the third aspect is a structure in which the elastic body is previously compressed so as to have a predetermined spring constant.

The invention according to the fourth aspect is characterized in that an elastic body is provided between a grindstone shoe and a grindstone or an auxiliary shoe to which the grindstone is attached and a main body shoe, and an adjusting tool capable of adjusting compression of the elastic body is provided.
It is a structure provided across the grindstone shoe and the grindstone or the auxiliary shoe and the main body shoe.

[0014]

According to the honing processing method of the present invention as set forth in the first aspect, the grindstone shoe provided on the honing head so as to be movable in the radial direction is expanded outward, and the grindstone provided on the grindstone shoe is moved to the machining hole. When performing honing by press contacting the inner peripheral surface, since it is a honing method that supports the above grindstone so that it can be moved in the radial direction via an elastic body, it is a honing method, When there are parts with different rigidity, the elastic body is compressed in the part with high rigidity to suppress the excessive surface pressure of the grindstone, and in the part with low rigidity, the elastic body is Due to the action, the grindstone is slightly moved outward and tends to keep the surface pressure substantially constant.

That is, even if there is a portion having different rigidity in the processed hole of the workpiece, the surface pressure of the grindstone can be maintained substantially constant, and the processed hole can be honed into an elliptical shape or the like. It can be prevented.

The honing head according to the second aspect of the present invention has a construction in which a grindstone is directly or indirectly attached to the outside of a grindstone shoe provided on the honing head so as to be movable in the radial direction, via an elastic body. Therefore, when the processed hole of the workpiece has a portion having different rigidity, the elastic body is compressed in the portion having high rigidity, and the surface pressure of the grindstone is suppressed from becoming excessive. Further, in a portion having low rigidity, the grindstone is finely moved outward and tends to maintain the surface pressure substantially constant.

Therefore, even if the holes to be machined have different rigidity, honing can be performed with the surface pressure of the grindstone kept substantially constant, and the holes can be processed with higher accuracy. It can be processed into a perfect circle.

According to the third aspect of the invention, since the elastic body is pre-compressed so as to have a predetermined spring constant, the elastic body is compressed in the highly rigid portion of the processed hole in the workpiece. In this case, or when the grindstone slightly moves outward in a portion having low rigidity, the spring constant of the elastic body does not largely change, and it is easy to keep the surface pressure of the grindstone substantially constant.

The invention according to the fourth aspect is characterized in that an elastic body is provided between a grindstone shoe and a grindstone or an auxiliary shoe to which the grindstone is attached and a main body shoe, and an adjusting tool capable of adjusting compression of the elastic body is provided.
Since the structure is provided over the grindstone shoe and the grindstone or the auxiliary shoe and the main body shoe, the spring constant of the elastic body is set in accordance with the magnitude of the difference between the portions having different rigidity of the processed hole in the workpiece. It is possible to maintain the surface pressure of the grindstone almost constant.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments will be described in detail below with reference to the drawings. In the structure of the honing head according to the embodiment, parts having the same functions as those of the constituent parts of the honing head described above are designated by the same reference numerals. , Duplicate description is omitted.

Referring to FIG. 1, the configuration of the honing head 1 according to this embodiment is almost the same as the configuration of the conventional honing head described above. The different structure is the whetstone 9
Since the configuration of the grindstone shoe 11 including the above is the same as the others, the configuration of the grindstone shoe 11 will be described in detail, and the description of the other configurations will be omitted.

Referring to FIGS. 1 and 2, a grindstone shoe 1
Reference numeral 1 denotes a main body shoe 1 having an inclined surface 11S inside which is pressed by the tapered portion 15 provided on the rod 17 described above.
1A and an auxiliary shoe 11B having a grindstone 9 attached to the outside, and an elastic body 25 such as rubber is interposed between the main body shoe 11A and the auxiliary shoe 11B.

The main body shoe 11A and the auxiliary shoe 11
At both upper and lower ends of B, slits 27 are formed which are in the radial direction when mounted in the slit 7 of the head body 5.

Then, the slit 27 is engaged with a U-shaped adjusting tool 29, and the main body shoe 11A and the auxiliary shoe 11B are provided by the projecting portions 29P provided on both sides of the adjusting tool 29.
By sandwiching and, it is possible to hold the elastic body 25 in an appropriately compressed state.

As described above, the protruding portion 29P of the adjusting tool 29.
With the main body shoe 11A and the auxiliary shoe 11B sandwiched between them, as shown in FIG.
1 is movably engaged in the slit 7 of the head body 5 in the radial direction, and the adjusting tool 29 is movably engaged in the radial grooves 7G formed at the upper and lower ends of the slit 7. The grindstone shoe 11 is attached to the head body 5.

By the way, the relationship between the displacement X and the spring constant K when the elastic body 25 made of rubber or the like is compressed is not proportional to the general coil spring or the like, and has a relationship as shown in FIG. is there. Therefore, in order to use a region in which the displacement X and the spring constant K are in a substantially proportional relationship, the elastic member 25 is previously compressed by the adjuster 29, and the intervals of the protrusions 29P are various adjusters. By replacing the elastic body 25 with 29, the compression of the elastic body 25 can be adjusted in various ways.

The body 29 of the main body and the auxiliary shoe 11B are sandwiched by the adjuster 29 so that the elastic body 2
Initial displacement X of the elastic body 25 when 5 is previously compressed
₁ corresponds in advance to the portion of the workpiece having the lowest rigidity of the machined hole, and in the case of the displacement X ₂ when it is compressed to the minimum, it should correspond to the portion of the machined hole having the highest rigidity. It is provided.

In the above construction, the honing head 1 according to this embodiment is mounted on the lower end portion of the spindle 3 in the honing machine, as in the conventional honing head described above. Then, after inserting the honing head 1 into the machining hole H of the workpiece W, the spindle 3 is rotated and moved up and down, and the piston 23 in the hydraulic cylinder 21 provided in the spindle 3 is lowered.

Then, the rod 17 is lowered by the piston rod 23R provided on the spindle 23, and the grindstone shoe 11 is moved by the taper portion 15 provided on the rod 17.
Is moved radially outward and the grindstone 9 is pressed against the inner peripheral surface of the machined hole H, whereby the honing process of the machined hole H is performed.

When the grindstone 9 is pressed against the inner peripheral surface of the machined hole H as described above, a minute gap is generated between the inner side surface 29F of the outer protruding portion 29P of the adjusting tool 29 and the outer side surface 11F of the auxiliary shoe 11B. The elastic body 25, which has been compressed in the state where the displacement X ₁ is generated in advance, is further compressed and the displacement becomes X ₂ .

The displacement X ₂ is a range in which the surface pressure of the grindstone 9 does not become excessive when the grindstone 9 is pressed against a portion of the machined hole H having high rigidity, and the lowering position of the rod 17 is adjusted. It can be easily adjusted by doing.

As described above, when the grindstone 9 is pressed against the inner peripheral surface of the processed hole H to perform honing, the grindstone 9 is processed into the processed hole H.
When the elastic body 25 is located in a highly rigid portion, the elastic body 25 is compressed so that the displacement becomes X ₂ , but the surface pressure of the grindstone 9 does not become excessive, and the grinding amount of this highly rigid portion is large. Is not too large.

When the grindstone 9 is pressed into contact with a portion of the processed hole H having low rigidity, the rigidity is low, so that the processed hole H
The relevant portion of No. 2 is slightly deformed and tends to escape from the grindstone 9. However, the grindstone 9 slightly moves outward by a minute gap between the protrusion 29P on the outside of the adjuster 29 and the auxiliary shoe 11B, and follows the minute deformation of the low rigidity portion of the machined hole H. is there.

At this time, since the elastic body 25 is pre-compressed and the initial displacement X ₁ is displaced corresponding to the low rigidity portion of the processed hole H, the grindstone 9 is also applied to the low rigidity portion of the processed hole H. The surface pressure of is almost constant.

That is, when the machined hole H in the workpiece W has a high rigidity portion and a low rigidity portion, strictly speaking, the surface pressure of the grindstone 9 is slightly different between the high rigidity portion and the low rigidity portion. However, the difference is the same as in the conventional structure.
Is extremely small as compared with the difference between the surface pressure of the portion having high rigidity and the surface pressure of the portion having low rigidity when the is fixedly positioned at a predetermined position.

That is, according to the present embodiment, even if the processed hole H of the workpiece W has a high rigidity part and a low rigidity part, the surface pressure of the grindstone 9 is kept substantially constant and honing is performed. It can be performed and the processed hole H is not processed into an elliptical shape or the like.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in other modes by making appropriate changes. For example, as the elastic body 25,
Instead of an elastic body such as rubber, as shown in FIG. 4, an appropriate plate spring 25A such as a wave shape may be interposed as an elastic body between the main body shoe 11A and the auxiliary shoe 11B.

Further, as a structure capable of adjusting the compression of the elastic body 25, a bolt 29A penetrating the through hole provided in the auxiliary shoe 11B so as to be relatively slidable is screwed to the main body shoe 11A so as to be adjustable. Alternatively, the amount of tightening of the bolt 29A may be adjusted to adjust the compression of the elastic body 25.

That is, the present invention can be implemented in various modes by making appropriate design changes.

[0040]

As will be understood from the above description of the embodiments, the present invention as set forth in the first aspect is such that the grinding wheel shoe provided on the honing head so as to be movable in the radial direction is expanded outward, When performing the honing process by pressing the grindstone provided in the grindstone shoe to the inner peripheral surface of the processing hole, the grindstone,
Since this is a honing method in which the honing process is performed by supporting it so that it can move in the radial direction via an elastic body, even if there is a part with different rigidity in the hole to be machined, the surface pressure of the grindstone is almost It can be held constant and can prevent honing of the machined hole into an elliptical shape or the like.

The honing head according to the second aspect of the present invention has a construction in which a grindstone is directly or indirectly attached to the outside of a grindstone shoe provided on the honing head so as to be movable in the radial direction, via an elastic body. Therefore, even if there is a portion with different rigidity in the processed hole of the workpiece, honing can be performed while keeping the surface pressure of the grindstone almost constant,
The machined hole can be machined into a more accurate perfect circle.

According to the third aspect of the invention, since the elastic body is compressed in advance so as to have a predetermined spring constant, the elastic body is compressed in a portion of the workpiece having a high rigidity of the processed hole. When the grindstone moves outward in a low rigidity area, the spring constant of the elastic body does not fluctuate significantly, and the surface pressure of the grindstone is kept almost constant, Can be always kept substantially constant, honing can be carried out over the entire peripheral surface of the machined hole, and honing with high circularity can be carried out.

In the invention described in the fourth aspect, an elastic body is provided between the grindstone shoe and the grindstone or an auxiliary shoe to which the grindstone is attached and the main body shoe, and an adjusting tool capable of adjusting the compression of the elastic body is provided.
Since the structure is provided over the grindstone shoe and the grindstone or the auxiliary shoe and the main body shoe, the spring constant of the elastic body is set in accordance with the magnitude of the difference between the portions having different rigidity of the processed hole in the workpiece. It is possible to easily perform the honing process while keeping the surface pressure of the grindstone substantially constant, and to perform the honing process with high roundness.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory diagram of a honing head according to an embodiment.

FIG. 2 is an explanatory diagram showing a configuration of a grindstone shoe to which a grindstone is attached.

FIG. 3 is an explanatory diagram showing characteristics of an elastic body.

FIG. 4 is an explanatory view showing another aspect of a grindstone shoe.

FIG. 5 is an explanatory diagram showing a configuration of a conventional honing head.

[Explanation of symbols]

 5 Honing main body 7 Slit 9 Grindstone 11 Grindstone shoe 11A Auxiliary shoe 11B Main body shoe 25 Elastic body 29 Adjusting tool

Claims (4)

[Claims] 1. A method of honing a processing hole of a workpiece, wherein a grindstone shoe provided on a honing head so as to be movable in a radial direction is expanded outward, and the grindstone provided on the grindstone shoe is machined as described above. A honing method, characterized in that, when the honing process is performed by pressing against the inner peripheral surface of the hole, the grindstone is pressed against the inner peripheral surface of the processing hole through an elastic body to perform the honing process. 2. A honing head, wherein a grindstone is directly or indirectly attached to the outside of a grindstone shoe provided on the honing head so as to be movable in the radial direction, via an elastic body. 3. The honing head according to claim 2, wherein the elastic body is pre-compressed so as to have a predetermined spring constant. 4. An elastic body is provided between a grindstone shoe and a grindstone or an auxiliary shoe to which the grindstone is attached, and a main body shoe, and an adjusting tool capable of adjusting the compression of the elastic body is provided with the grindstone shoe and the grindstone or the auxiliary shoe. The honing head according to claim 2 or 3, wherein the honing head is provided so as to extend over the main body shoe.