JP2003311602A - Honing tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow highly accurate polishing by uniformly expanding or shortening diameter of the entire range of a polishing part, in a honing tool used in honing precise finishing of a machining hole in a post processing such as drilling, reaming, or boring in a machining center or an NC drilling machine, having an electro-deposition part for adhering non-metal particles of especially diamond, borazon, or the like by an electro-deposition method, and expanding or shortening the diameter. <P>SOLUTION: The honing tool comprises a cylinder 2 having a cylindrical shape, a grinding part 3 formed outside it, a plurality of cut grooves 4 formed in the cylinder 2 and radially expand or contract the grinding part 3, a cylinder tapered part 5 formed inside the cylinder 2, an expanded body 6 disposed movably back and forth with respect to the cylinder 2, an expanded body tapered part 7 formed outside it and adapting to the cylinder tapered part 5, and thin parts 8 formed on both sides of the cylinder 2 and the grinding part 3. Especially, the thin parts 8 are formed on both sides of the cylinder 2 and the grinding part 3. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, in drilling in a machining center, NC drilling machine, etc., when performing precision honing of a machined hole in the subsequent steps of reaming and boring, and especially non-metallic particles such as diamond and borazon. The present invention relates to an improvement of a honing tool which has a grinding portion bonded by an electrodeposition method and which can be expanded and reduced in diameter.

[0002]

2. Description of the Related Art Conventionally, as honing tools of this type, for example, those described in Japanese Patent Publication No. 6-73806, JP-A-51-89288 and JP-A-62-815.
The one described in No. 59 is known.

The former one is basically a tubular body having a tubular shape, a grinding portion formed on the outer side of the tubular body, and a single slit groove formed over the entire length of the tubular body. A tubular body taper portion formed inside the tubular body, an expansion body provided so as to be movable back and forth with respect to the tubular body, and an expansion body taper portion formed outside the expansion body and adapted to the tubular body taper portion It consists of and. The latter is basically a tubular body having a tubular shape,
A grinding part formed on the outside of the cylinder, a plurality of slit grooves formed on the cylinder to expand and contract the grinding part in the radial direction, a cylinder taper part formed on the inside of the cylinder, and a cylinder. The expansion body is provided so as to be movable back and forth with respect to the body, and an expansion body taper portion formed outside the expansion body and adapted to the cylindrical taper portion.

[0004]

However, in the former case, since a so-called single slit groove having both ends open is formed, when the cylinder body is expanded by the expansion body, it becomes a cylinder body. Since a slight gap is formed between the expansion body and this gap only disappears when the cylindrical body is pressure-bonded from the outside, there is a problem that an accurate dimension cannot be measured immediately. Further, if it is expanded too much, the cylinder may not be contracted originally, and it is very difficult to finely adjust it. Further, when the tubular body is expanded by the expander, there is a tendency to expand first in the vicinity of the slit groove, and since it does not expand in a so-called perfect circle shape, there is a problem that the accuracy is poor. On the other hand, the latter one is formed with a plurality of slits whose so-called both ends are not opened, so that the difficulty of the former one can be solved.

In the latter case, however, since a plurality of slit grooves whose both ends are not opened are formed, the grinding portion can be deformed in the radial direction, but in the axial direction of the grinding portion, that is, in the front-back direction. Is not deformed with the same diameter, but is deformed into a so-called barrel shape in which both ends of the slit groove are small in diameter and large in the middle, so only the large diameter part of the grinding part can be used for grinding finishing, so it is highly accurate. I couldn't grind.

The present invention has been made in view of the above problems and was devised to solve the problem. The problem is that the entire range of the polishing portion can be uniformly expanded / reduced to perform highly accurate polishing. To provide honing tools designed to

[0007]

The honing tool of the present invention basically comprises a tubular body having a tubular shape, a grinding portion formed outside the tubular body, and a grinding portion formed on the tubular body. A plurality of slit grooves for expanding and contracting in the radial direction, a cylindrical taper portion formed inside the cylindrical body, an expansion body provided so as to be movable back and forth with respect to the cylindrical body, and formed outside the expansion body It is characterized in that it is composed of an expanded body taper portion that is fitted to the cylindrical body taper portion and thin-walled portions formed on both sides of the ground portion of the cylindrical body.

When the expansion body is moved in the expansion direction with respect to the cylindrical body, the grinding portion of the cylindrical body is elastically deformed by the expansion body taper portion and the corresponding cylindrical body taper portion to be expanded in the radial direction. In this case, since the cylindrical body is provided with the plurality of slit grooves and the thin portion, the polishing portion is elastically deformed in the radial direction, and this radial elastic deformation is evenly performed in the axial direction. The entire area of the grinding portion is evenly expanded. That is,
The grinding portion was expanded in a so-called barrel shape only with a plurality of slit grooves, but the grinding portion was expanded in a so-called cylindrical shape due to the thin portion. On the contrary, when the expansion body is moved in the contraction direction with respect to the cylindrical body, the grinding portion of the cylindrical body is elastically deformed by the expansion body taper portion and the corresponding cylindrical body taper portion to be contracted in the radial direction. Therefore, since the entire area of the grinding portion can be used for grinding, highly accurate grinding can be performed.

It is preferable that a plurality of thin portions are formed at predetermined intervals. By doing so, the entire area of the ground portion can be expanded and contracted more uniformly.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a honing tool of the present invention with its upper half sectioned. 2 is the same as FIG.
2 arrow view. FIG. 3 is a view on arrow 3-3 of FIG. 1. 4 is shown in FIG.
4-4 arrow view. FIG. 5 is a view on arrow 5-5 in FIG. 1. Figure 6
[Fig. 2] is a sectional view of an essential part of Fig. 1, showing an expanded state.

The honing tool 1 includes a cylindrical body 2, a grinding portion 3,
The slit groove 4, the cylindrical taper portion 5, the expansion body 6, the expansion body taper portion 7, the thin portion 8, the handle body 9, and the adjusting and moving means 10 constitute a main part thereof.

The cylindrical body 2 has a cylindrical shape. In this example, the cylindrical body 2 has a slender cylindrical shape, and the guide portion 11, the grinding portion 3 and the non-contact portion 12 are sequentially arranged on the outer side thereof in the front side (in FIG. 1). The left is the front). The guide portion 11 has substantially the same diameter as the grinding portion 3 and the front half thereof is tapered. Non-contact part 1
2 has a diameter slightly smaller than that of the grinding portion 3 so that it does not come into contact with an object to be ground (not shown). On the rear side of the cylinder 2,
A female screw 13 is engraved for detachably connecting to the handle 9.

The grinding portion (electrodeposition portion) 3 is formed on the outer side of the cylindrical body 2. In this example, it is formed on the outer side of the cylindrical body 2 near the front side of the guide portion 11, and the diamond or diamond It is formed by adhering non-metallic particles such as borazon by an electrodeposition method. The grinding portion 3 is formed with a shallow groove 14 which serves as a passage for cutting chips and cutting oil. The shallow groove 14 has a spiral shape,
Only a plurality (eight) are cut at equal intervals in the circumferential direction of the grinding portion 3.

A plurality of slit grooves 4 are formed in the cylindrical body 2 for expanding and contracting the grinding portion 3 in the radial direction. In this example, the cutting groove 3 is formed in the grinding portion 3 and a predetermined length portion on both front and rear sides thereof. It is straddled, and both ends are not open. Slit groove 4
Have a spiral shape, and a plurality (eight) are cut at equal intervals in the circumferential direction of the cylindrical body 2, and are arranged so as to be located between the adjacent shallow grooves 14.

The cylindrical taper portion 5 is formed on the inner side of the cylindrical body 2, and in this example, it is formed only on the inner side corresponding to the grinding portion 3 of the cylindrical body 2, and has a smaller diameter toward the front side. It has a predetermined gradient (1/50).

The expansion body 6 is provided so as to be movable back and forth with respect to the cylindrical body 2. In this example, the conical portion 15, the shaft portion 16 connected to the rear side of the conical portion 15, and the inner portion of the conical portion 15 are provided. It is provided with a hollow portion 17 which is formed and whose front is open, and is inserted into the inside from the rear side of the tubular body 2 so as to be movable back and forth.

The expansion body taper portion 7 is formed outside the expansion body 6 and fits the cylindrical body taper portion 5. In this example, the expansion body taper portion 7 is formed outside the conical portion 15 of the expansion body 6, and the front side. It has a predetermined gradient (1/50) that becomes smaller as it goes to.

The thin portions 8 are formed on both sides of the grinding portion 3 of the cylindrical body 2. In this example, a plurality (two) of thin portions 8 are formed on both sides of the grinding portion 3 at a predetermined interval. . That is, it is formed by cutting the peripheral grooves from the outside at two places, that is, the nearest portions on both sides of the grinding portion 3 and the portions corresponding to both ends of the slit groove 4 which are separated from each other by a predetermined distance.

The handle (shank) 9 is to be detachably attached to a honing machine (not shown). In this example, the handle 9 is detachably provided on the rear side of the cylinder 2.
Large-diameter male screw portion 18 screwed to the female screw 13, the nut portion 19 connected to the rear side thereof, the small-diameter male screw portion 20 connected to the rear side thereof, the mounting shaft portion 21 connected to the small-diameter male screw portion 20, and the large diameter male member. The screw portion 18, the nut portion 19, and the accommodation cavity 22 formed inside the small-diameter male screw portion 20 and accommodating the shaft portion 16 of the expansion body 6 slidably in the front-rear direction are provided.

The adjustment moving means 10 is for adjusting and moving the expansion body 6 with respect to the tubular body 2 and holding the state.
In this example, the diametrical through hole 23 is provided between the handle body 9 and the expansion body 6 and is formed in the rear side of the shaft portion 16 of the extension body 6, and the small diameter male screw of the handle body 9. A long hole 24 formed in the portion 20 and long in the front-rear direction, a small-diameter male screw portion 20 of the handle 9, a lock nut 25 and an adjusting nut 26 screwed into the male screw portion 20, and a small diameter of the handle 9. A ring 27 that is loosely fitted to the male screw portion 20 and is held by the nuts 25 and 26;
A diametrical through hole 28 formed in the ring 27, a through hole 28 in the ring 27, a long hole 24 in the handle 9 and a through hole 2 in the expansion body 6.
And a pin 29 which is fitted into the shaft 3 to prevent the expansion body 6 from rotating with respect to the handle body 9 and is movable in the front-rear direction by a predetermined distance.

Next, the operation will be described based on such a configuration. From the state shown in FIG. 1, when the lock nut 25 of the adjustment moving means 10 is loosened and the adjustment nut 26 is tightened, the expansion body 6 is moved in the expansion direction (forward direction) via the ring 27 and the pin 29. Then, the grinding portion 3 of the cylindrical body 2 is elastically deformed by the expanded body taper portion 7 and the corresponding cylindrical body taper portion 5 to be expanded in the radial direction. In this case, since the cylindrical body 2 is provided with the plurality of slit grooves 4 and the thin portion 8, the polishing portion 3 is elastically deformed in the radial direction, and this radial elastic deformation is also in the axial direction. Is performed evenly, and the entire area of the grinding portion 3 is evenly expanded (see FIG. 6).
reference). In other words, if the plurality of slits 4 alone are used,
However, the grinding portion 3 is expanded in a so-called cylindrical shape due to the thin portion 8.

On the contrary, when the expansion body 6 is moved in the contracting direction (rearward direction) with respect to the cylindrical body 2, the grinding portion of the cylindrical body 2 is moved by the expanded body taper portion 7 and the corresponding cylindrical body taper portion 5. 3 is elastically deformed and contracted in the radial direction (see FIG. 1). Also at this time, the polishing portion 3 is elastically deformed in the radial direction by the plurality of slits 4 and the thin portion 8, and the elastic deformation in the radial direction is evenly performed in the axial direction. The entire range of is contracted evenly. Therefore, since the entire area of the grinding unit 3 can be used for grinding, highly accurate grinding can be performed.

The honing tool 1 shown in FIG. 1 was manufactured as a trial product, and as shown in FIG. 6, after expanding to 0.05 mm with a single wall, the dimensions of both ends of the grinding portion 3 were measured.
The error was mm. Further, when it was shrunk to its original state, it returned to the original size and there was no such error.

Although the slit groove 4 is spiral in the above example, the slit groove 4 is not limited to this and may be, for example, a straight line parallel to the axial direction. Although the number of the slit grooves 4 is eight in the above example, the number of slit grooves 4 is not limited to eight, and may be a plurality other than this. Although two thin portions 8 are provided in the above example, the number of thin portions 8 is not limited to this, and may be another number, for example. The handle 9 is
In the above example, it is provided in the tubular body 2, but the present invention is not limited to this, and may be provided in the expansion body 6, for example. In the previous example, the adjustment moving means 10 is composed of the small diameter male screw portion 20, the through hole 23, the long hole 24, the lock nut 25, the adjustment nut 26, the ring 27, the through hole 28, and the pin 29. Not limited to this, for example, another structure may be used. In the above example, the adjustment moving means 10 is provided between the expansion body 6 and the handle body 9, but the adjustment movement means 10 is not limited to this, and may be provided between the tubular body 2 and the expansion body 6, for example. Although the shallow groove 14 has a spiral shape in the above example, the shallow groove 14 may have a linear shape parallel to the axial direction, without being limited to this. Although the number of the shallow grooves 14 is eight in the above example, the number of the shallow grooves 14 is not limited to this, and may be another number, for example.

[0025]

As described above, according to the present invention,
The following excellent effects can be achieved. (1) A tubular body having a tubular shape, a grinding portion formed on the outer side of the tubular body, a plurality of slit grooves formed on the tubular body for expanding and contracting the grinding portion in the radial direction, and inside the tubular body. The formed cylindrical taper portion, the expansion body provided so as to be movable back and forth with respect to the cylindrical body, the expansion body taper portion which is formed on the outside thereof and conforms to the cylindrical body taper portion, and the grinding portion of the cylindrical body Since the thin-walled portions are formed on both sides of the cylindrical body, and in particular, the thin-walled portions are formed on both sides of the grinding portion of the cylindrical body, the entire range of the polishing portion can be uniformly expanded / reduced to perform highly accurate polishing. (2) Since only thin portions are formed on both sides of the ground portion of the cylindrical body, the structure is simple and the cost is low, and it can be easily applied to existing ones.

[Brief description of drawings]

FIG. 1 is a side view showing a honing tool of the present invention with its upper half sectioned.

FIG. 2 is a view on arrow 2-2 of FIG.

FIG. 3 is a view on arrow 3-3 in FIG.

FIG. 4 is a view on arrow 4-4 in FIG.

5 is a view on arrow 5-5 of FIG. 1. FIG.

FIG. 6 is a cross-sectional view of an essential part of FIG. 1 showing an expanded state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Honing tool, 2 ... Cylindrical body, 3 ... Polishing part, 4 ... Cut groove, 5 ... Cylindrical taper part, 6 ... Expansion body, 7 ... Expansion body taper part, 8 ... Thin part, 9 ... Handle body, 10 ... adjusting moving means, 1
DESCRIPTION OF SYMBOLS 1 ... Guide part, 12 ... Non-contact part, 13 ... Female screw, 14 ... Shallow groove, 15 ... Conical part, 16 ... Shaft part, 17 ... Hollow part, 18 ... Large diameter male screw part, 19 ... Nut part, 20 ... Small diameter male thread part, 2
DESCRIPTION OF SYMBOLS 1 ... Attachment shaft part, 22 ... Storage cavity, 23 ... Through hole, 24 ... Long hole, 25 ... Lock nut, 26 ... Adjustment nut, 27 ... Ring, 28 ... Through hole, 29 ... Pin.

Claims (2)

[Claims] 1. A tubular body having a tubular shape, a grinding portion formed on the outside of the tubular body, a plurality of slit grooves formed in the tubular body for expanding and contracting the grinding portion in a radial direction, and the tubular body. A tubular body tapered portion formed inside the tubular body, an expansion body provided so as to be movable back and forth with respect to the tubular body, an tubular body tapered portion formed outside the tubular body and adapted to the tubular body tapered portion, A honing tool characterized by being composed of thin-walled parts formed on both sides of the ground part of the body. 2. The honing tool according to claim 1, wherein a plurality of thin portions are formed at predetermined intervals.