JP3389497B2 - Indexable insert for internal machining and internal machining tool using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for machining an inner diameter, and more particularly to a tool suitable for machining a very small inner diameter for small parts such as OA equipment parts, electronic parts, small diameter bearings. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, for machining the inner diameter, a throw-away type in which a tip 22 is detachably fixed to a tip end of a holder 21, and a holder 3 as shown in FIG.
A brazed type in which a tip 32 is brazed and fixed to the tip portion of 1 and an integrated type in which a cutting edge portion 44 and a holder portion 43 are ground from a cylindrical body and made of the same material as shown in FIG. 6 are used. It was

Of these, the brazed type requires a labor such as mounting at the time of cutting and is uneconomical. Therefore, the throw-away type and the integrated type are mostly used at present.

The throw-away type is generally used for large-diameter small-diameter machining of large-diameter products such as automobile parts, and the integral type is used for ultra-small-diameter machining of OA equipment parts and electronic parts. ing.

As shown in FIG. 6, the integrated tool generally comprises a tip 45 composed of a working portion 44 and a holding portion 43, and a sleeve 46 for fixing and supporting the tip 45. The tip 45 is usually manufactured by cutting from a cylindrical body, but in order to make the holder uniform, the diameter l ₁ of the holding portion 43 is made the same, and the shape (diameter) of the processed portion 44 is changed to obtain a desired shape. It is applied to inner diameter processing.

[0006]

However, in the integrated type shown in FIG. 6, since the set bolt (not shown) is applied to the shank of the chip from the outside of the sleeve to fix the shank of the chip, the force for restraining the chip is weak. There was a problem that chatter vibration was likely to occur. Further, there is a problem that the accuracy of repeating the position of the cutting edge is poor. Furthermore, since the end surface of the sleeve is positioned so as to completely close the hole of the work during machining of the inner diameter, there is a problem in the chip discharging property. In addition, since a sleeve is used, there is also a restriction that it is not possible to carry out smoothing processing.

In view of the problems of the prior art as described above, the present invention can be applied to the machining of a very small diameter, the binding force of the tip is large, chatter vibration is unlikely to occur, and the position of the cutting edge is repeated. An object of the present invention is to provide a high-performance inner diameter machining tool that is highly accurate, excels in chip discharge, and is capable of smoothing.

[0008]

In order to solve the above-mentioned problems, the present invention comprises a small-diameter rod-shaped portion projecting along one side integrally with a flat plate-shaped base for fixing a holder. A tip cutting edge and a rake surface continuous with the cutting edge are formed at the tip end part of the workpiece to machine the inner diameter of the work, and a part of the cutting edge is placed laterally from the peripheral surface of the small diameter rod-shaped part. An inner diameter processing throw-away tip that is provided with a lateral flank by projecting, and when processing the inner diameter of the work, inserts only the small diameter rod portion into the processing hole of the work to machine the inner diameter of the work. , And, when the flat base is placed and fixed on the chip seating surface in the pocket provided in the top end portion of the long holder so that the small diameter rod-like portion protrudes forward, when processing the inner diameter of the workpiece. Is the work piece only for the small diameter rod In which providing cents to the inner diameter machining tool using the cutting insert, characterized in that inserted into the processing hole machining an inner diameter of the workpiece.

[0009]

According to the structure of the present invention as described above, the flat base portion forming the throw-away tip is fitted and fixed in the pocket provided by cutting out the top end side of the holder. The fixed part (flat base) of the throw-away tip (hereinafter referred to as the tip) is not hidden as in the case of using a sleeve, but is exposed to the outside, so that the bolt penetrates the fixed part. A hole or the like may be provided so that the holder can be bolted, or a clamp piece or the like can be used to firmly fix the holder. In short, the fixed part of the chip is like a normal plate-shaped chip, and the fixing method is the same as described above with respect to the plate-shaped chip such as a clamp piece or a bolt that is screwed into the holder in the bolt hole. A known method used may be adopted. Since the chip can be firmly fixed in this manner, chatter vibration can be suppressed.

Further, according to the throw-away tip, the small-diameter rod-shaped portion having the tip cutting edge ridge projects forward from the holder, so that the inside of the small-diameter hole can be machined like an earpick. Furthermore, since the processed portion is arranged along the side surface of the holder, the end surface of the holder does not get in the way and the chips are smoothly discharged out of the hole.

Finally, the throw away tip can be subjected to a slimming process by arranging the small diameter rod-shaped portion obliquely and laterally with respect to the longitudinal direction of the holder.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 (a) is a schematic view of a tip for inner diameter processing of the present invention, and FIG. 1 (b) is a view taken in the direction of arrow X in FIG. 1 (a).
FIG. 1C is a view on the Y line in FIG. 1B.

As shown in FIG. 1A, the chip 1 has a shape in which the rear flat plate-shaped base portion 3 is formed by dividing a rhombic flat plate into halves in the minor axis direction, and bolt holes 4 are formed in the thickness direction thereof. ing. On the other hand, the tip side is formed as a small-diameter rod-shaped portion 7 that integrally projects with the flat plate-shaped base portion 3 along one side surface,
Moreover, the tip edge is used as a tip cutting edge ridge 5, and a rake face 6 is formed following the tip cutting edge ridge 5. Also,
The tip cutting edge ridge 5 has a part thereof protruding laterally,
Thereby, the lateral flank surface 7a is provided.

The rake face 6 has a breaker raised surface 6a on the rear side, a lateral curved portion 6c on the front side, and a concave notch 6b continuous with the lateral curved portion 6c.
Is formed on the lateral flank 7a. That is, the chips cut by the tip cutting edge ridge 5 are the rake face 6
It is configured to be guided to the concave cutout 6b formed in the lateral flank 7a of the small diameter rod-shaped portion 7 via the lateral curved portion 6c. In addition, as shown in FIG.
Has a curved shape, which facilitates curl of the chips in a spiral shape with a concave center and facilitates lateral discharge of the chips by the lateral curved portion 6c. It is a device for.

Next, FIG. 2A is a top view of the inner diameter machining tool 8 of the present invention in which the tip 1 is mounted, and FIG.
It is a Z arrow view of (a), It is a side view of the said inner diameter processing tool 8. For the sake of explanation, the following fixing bolts are omitted.

As shown in FIG. 2, the tip end of the upper surface 10 of the elongated holder 9 is provided with a chip pocket 11 which is cut out so as to fit with the flat base 3 of the chip 1. The bottom surface provided on the flat plate-shaped base portion 3 of the chip 1 is placed on the chip seating surface 12 of the chip pocket 11, and under this state, a fixing bolt (not shown) is attached to the flat plate-shaped base portion 3 from above the flat plate-shaped base portion 3. It is inserted into the bolt hole 4 and is further screwed into the bolt fixing hole 13 formed in the chip seat surface 12 of the holder 9.

By fixing the chip 1 to the holder 9 as described above, the small-diameter rod portion 7 of the chip 1 is projected in the longitudinal direction of the holder 9. Then, the small-diameter rod portion 7 can be inserted into the hole of the work, and the inside of the extremely small-diameter hole can be processed like an earpick.

A flat plate-shaped base portion 3 forming the chip 1 is also provided.
Is exposed to the outside, and therefore, the bolt can be inserted as described above, or can be firmly fixed by using a clamp piece or the like, so that the occurrence of chatter vibration can be suppressed.

Next, FIG. 3A shows the inner diameter machining tool 8 described above.
It is an explanatory view of the cutting process using, as shown in the figure,
A state in which only the small diameter rod-shaped portion 7 of the chip 1 is inserted into the hole of the work W and boring is performed is shown. According to the inner diameter processing tool 8, the small diameter rod-shaped portion 7 is held by the holder 9
Since the end surface of the holder 9 does not get in the way, the chips can be smoothly discharged out of the hole. That is, since the chip advancing direction is not blocked near the exit of the work W, the chips can be discharged smoothly. In particular, as in the above embodiment, the rake face 6 is provided with the lateral curved portion 6c, and one side flank face 7a of the small diameter rod-shaped portion 7 is provided.
By providing the concave cutout 6b continuous with the lateral curved portion 6c, the cut chips are reliably guided from the concave cutout 6b to the exit of the work W through the side flank 7a side of the tip cutting edge ridge 5. Therefore, the chip discharging property becomes very good.

FIG. 3B shows another embodiment of the present invention. As shown in FIG. 3, this inner diameter machining tool is provided between the axial direction of the small diameter rod portion 7 and the axial direction of the holder 9. The arrangement is provided at an angle, and with such a configuration, it is possible to carry out smoothing inside the work W.

Although the embodiments of the present invention have been exemplified above with reference to the drawings, the present invention is not limited to the above embodiments, and it goes without saying that the embodiments can be arbitrary without departing from the object of the invention. Yes.

[0023]

As described above, according to the present invention, the fixing portion (flat plate-shaped base portion) of the chip is not hidden as in the case of using the sleeve, but is exposed to the outside. The fixing portion may be provided with a bolt through hole or the like so that it can be fixed to the holder with a bolt, or can be firmly fixed by using a clamp piece or the like.

Further, in the inner diameter processing tool using this tip, the small diameter rod-shaped portion having the tip cutting edge ridge projects forward from the holder, and when processing the inner diameter of the work, only the small diameter rod-shaped portion is processed. Since it is inserted into the hole and processed, the inside of the hole having a small diameter can be processed like ear picking. At this time, since the processed portion is arranged along the side surface of the holder, the end surface of the holder does not get in the way and the chips are smoothly discharged out of the hole.

Further, the throw-away tip can be subjected to a sliming process by arranging the small diameter rod-shaped portion obliquely and laterally with respect to the longitudinal direction of the holder.

As described above, the tool of the present invention is a high performance inner diameter machining tool.

[Brief description of drawings]

FIG. 1 (a) is a schematic view of a chip of the present invention,
(B) is a view on arrow X of (a), and (c) is a view on arrow Y of (b).

2A is a top view of an inner diameter processing tool of the present invention using the tip of FIG. 1, and FIG. 2B is a Z arrow view of FIG.

FIG. 3A is an explanatory diagram of a cutting process using the inner diameter machining tool of FIG. 2, and FIG. 3B is an explanatory diagram of a cutting process using an inner diameter machining tool of another embodiment.

FIG. 4 is a top view of a conventional throw-away type inner diameter machining tool.

FIG. 5 is a top view of a conventional brazing-type inner diameter machining tool.

FIG. 6 is a fragmentary cutaway view of a conventional integrated type inner diameter machining tool.

[Explanation of symbols]

1: throw-away tip 3: Flat base 4: Bolt hole 5: Tip cutting edge 6: rake face 6a: Raised surface of breaker 6b: concave notch 6c: Lateral curved portion 7: Small diameter bar 7a: Side flank 8: Inner diameter processing tool 9: Holder 10: Top surface 11: Chip pocket 12: Tip seat surface 13: Bolt fixing hole W: Work

Continuation of the front page (56) References JP-A-1-234104 (JP, A) Fukukaihei 2-335602 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23B 27 / 14 B23B 29/00

Claims (4)

(57) [Claims] 1. A small-diameter rod-shaped portion is projected along one side integrally with a flat plate-shaped base portion for fixing a holder, and a tip cutting blade for machining the inner diameter of a work is formed at the tip portion of the small-diameter rod portion. forming a ridge and a cutting edge continuous rake face in Ling, further Ri Na includes a lateral flank by protruding a part of the cutting edge Ling sideways from the peripheral surface of the small-diameter rod portion, said work
When processing the inner diameter of the
Internal machining indexable insert for insert into the processing hole of the click you machining the inner diameter of the workpiece. 2. The inner diameter machining according to claim 1, wherein the rake face is provided with a lateral curved portion and a concave cutout continuous with the lateral curved portion to guide the chips to the lateral flank face side. Throw-away tip. 3. The throw-away tip for inner diameter machining according to claim 1, wherein the leading edge cutting edge is formed in a curved shape. 4. The flat plate-shaped base is mounted and fixed on a chip seating surface in a pocket provided at a top end portion of an elongated holder so that the small-diameter rod-shaped portion projects forward .
When processing the diameter, only the small diameter rod-shaped portion of the work
The inner diameter machining tool using the throw-away tip according to claim 1 or 2, wherein the inner diameter of the work is machined by being inserted into a machining hole .