JPH0347961B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a throw-away tip used in a cutting tool such as a cutting tool.

[Technical background of the invention and its problems]

The parts involved in cutting of the throw-away tip are mainly the outer contour parts, and the inner parts are not actively involved in cutting. Based on the above-mentioned reasons, in order to save resources on expensive cutter materials, the throw-away tip body (hereinafter referred to as the tip body) 1 that forms the cutler has an inner shape that is different from the outer shape (the tip body) as shown in Fig. 1. An insert body 3 made of an inexpensive material, which is formed into a cylindrical shape similar to or similar to the shape of a triangle in FIG. There is a type in which a throw-away tip is constructed by attaching the tip to the hollow part of the tip body 1 and constructing the throw-away tip. In the case of the throw-away tip with the above configuration, a good contact state is maintained no matter what combination the inner shape and three sides of the tip body 1 and the three outer sides of the insert body 3 are installed. However, there was a problem in that the three sides of the outer shape of the insert 3 had to have dimensional accuracy, surface roughness, etc. accurately controlled, and were not easy to manufacture.

Further, as shown in FIG. 2, the tip fixing pin 5 of the cutting tool holder 4 is fitted into the hole 2 provided in the insert body 2, and the fixing pin 5 is inclined and pressed against the hole 2 of the insert body 3. When fixing the throw-away tip to the tool holder 4, there is a small gap between the inner shape of the insert body 3 and the tip body 1 on the opposite side to the press-contact part of the hole 2 where the pin 5 is press-contacted. Chip powder and the like enter this gap during cutting, and it takes time and effort to remove it, and it takes time and effort to separate the chip body 1 and the insert body 3, which has the disadvantage that maintenance is not easy.

[Purpose of the invention]

The present invention was made based on the above circumstances, and
The aim is to provide a throw-away tip with an insert that is easy to manufacture and easy to maintain.

[Summary of the invention]

In order to achieve the above object, the throw-away tip according to the present invention is made of a cutter material, and has an outer circumferential surface of a predetermined shape formed therein, and has an outer circumferential surface formed concentrically with the outer circumferential surface to define a hollow part. a throwaway tip body having a similar or similar inner peripheral surface; and a throwaway tip body that is removably attached to a tool holder, is fixed to a hollow portion of the throwaway tip body, and is fixed to a hollow portion of the throwaway tip body; The throw-away tip has an outer circumferential surface that is substantially the same as the inner circumferential surface of the throw-away tip, and is fixed to the tool holder, so that a through hole passing through the tip in the thickness direction is formed, and a notch is formed at a portion that abuts the inner circumferential portion of the throwaway tip body. and an insert formed by.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a configuration diagram showing a first embodiment of the throw-away tip according to the present invention, and shows a state where it is attached to a tool holder. In FIG. 3, the same parts as in FIGS. 1 and 2 are given the same reference numerals, and the explanation thereof will be omitted.

In FIG. 3, reference numeral 6 denotes an insert body in which a notch 7 having a length l is formed with respect to the length k of one side of the inner shape of the tip body 1 having a triangular outer shape, and a hole 2 for attachment is provided. This insert 6 is mounted in the hollow part of the tip body 1, and is pressed against the hole 2 of the insert 6 by a fixing pin 5 of the tool holder 4, thereby fixing the entire throw-away tip to the tool holder 4.

Note that the notch 7 is provided with a fixing pin 5 in the fixing hole 2.
However, the size of the triangular tip body 1 and the insert body 6 of this embodiment is determined by l≦2/3k.

Next, the operation of this embodiment will be described. In FIG. 3, the fixing pin 5 of the tool holder 4 is tilted in the direction of the arrow 9 by turning the tightening screw 8 to the right, so that the tip body 1 is attached to the wall surface 10 of the tool holder 4 through the insert 6. It is pressed into place and fixed. At this time, even if there is a notch 7 in the insert 6, the portions 6A and 6B other than the notch 7 are in surface contact and pressure contact with the tip body 1 due to the inclination of the tip fixing pin 5. Therefore, there is no problem in fixing the chip body 1.

Furthermore, in FIG. 3, the position of the notch 7 provided in the insert body 6 can be placed at any top of the triangle without interfering with the fixing action of the tip body 1. This is because even when the tip body 1 is fixed with the insert body 3 shown in FIGS. 1 and 2, which does not have a notch, in the part opposite to the direction of inclination of the fixing pin 5,
There is usually a small gap between the inner shape of the tip body 1 and the outer shape of the insert body 3, and this part that does not actually serve to fix the tip body 1 is cut out as the notch 7. Because of this, there is no problem in fixing the chip body 1 in any way.

Furthermore, the insert 6 having the notch 7 facilitates attachment of the insert 6 to the chip body 1. Also,
Conventionally, there was an inconvenience that some of the chips from the cutting process entered the minute gap and became clogged, and could not be easily released to the outside. However, in the insert body 6 provided with the notch 7, the gap is large. Because it is formed,
Removal of chips is easily made.

Furthermore, in the insert 6 provided with the notch 7, the dimensional accuracy and surface roughness of the notch 7 that does not come into contact with the chip body 1 do not require the same processing accuracy as the part that comes into contact with the chip body 1. This reduces the manufacturing costs of the insert 6, reduces the manufacturing time, and saves material costs by the amount of the notch.

Furthermore, in this embodiment, since the cutting fluid easily flows into the notch 7 of the insert 6, the cooling effect is further promoted during cutting, and the life of the chip body 1 can be extended.

Next, second to thirteenth embodiments of the present invention will be described with reference to FIGS. 4 to 15.

In the second embodiment, as shown in FIG. 4, a notch 11 is formed in a triangular chip body 1 by a length l that is approximately 1/2 of the length k of one side of the inner shape. The structure is such that an insert body 12 is attached.

In the third embodiment, as shown in FIG. 5, a triangular chip body 1 is attached at an inclination angle θ (θ≒30) along a bisector from one vertex of the inner shape (triangular shape). An insert body 14 formed by cutting out a notch 13 is attached thereto. In this case, the length l and the length k have the same value.

In the fourth embodiment, as shown in FIG. 6, a triangular chip body 1 is provided with notches 15 having a length l (l≈1/4k) at each of the three vertices of the inner shape (triangular shape). The structure is such that an insert body 16 formed by the above-mentioned structure is attached.

In the fifth embodiment, as shown in FIG. 7, a rectangular chip body 17 is provided with a length l (l≈1/ 2k) at an inclination angle θ to form a notch 18, and an insert 19 is installed.

In the sixth embodiment, as shown in FIG. 8, a notch 20 is formed in a quadrangular chip body 17 by notching it along the opposite vertices of the inner shape (square shape) (the inclination angle θ is 45). The structure is such that an insert body 21 made of the following is attached.

In the embodiment of FIG. 7, as shown in FIG. 9, a notch is formed by cutting out a length l of approximately 1/2 of the length k of one side of the inner shape (square shape) in a square chip body 17. 22, and an insert body 24 having a generally concave notch 23 formed on the side opposite to the notch 22.

In the eighth embodiment, as shown in FIG. 10, a rectangular chip body 17 has a large notch 25 having a length l at two opposing vertices of the inner shape (quadrangular shape). The structure is such that an insert body 27 is attached, which is formed by forming a notch 26 which is formed by cutting out another two opposing vertices by a length l'(l>l').

As shown in FIG. 11, the ninth embodiment replaces the notch 26 with a length l' in the eighth embodiment with a length l
Insert body 29 with large notch 28 (l>l')
is attached to the chip body 17.

In the tenth embodiment, as shown in FIG. 12, a notch 31 is formed in a circular chip body 30 by a length n (n≒1/4 m) with respect to the diameter m of the inner shape (circular shape). It has a structure in which an insert body 32 formed by the above-mentioned structure is attached.

In the eleventh embodiment, as shown in FIG. 13, a notch 33 is formed in a circular chip body 30 by a length n (n≒1/2 m) relative to the diameter m of the inner shape (circular shape). It has a structure in which an insert body 34 formed of the above is attached.

As shown in FIG. 14, the twelfth embodiment has a notch 35 with a length n'(n'≒14 m) formed in a portion of the insert body 34 opposite to the notch 33 in the eleventh embodiment. The structure is such that an insert body 36 is attached.

As shown in FIG. 15, the thirteenth embodiment has a circular chip body 30 with a length n'(n'≒1/4 m to 1/3 m) relative to the inner diameter (m) of the chip body 30. An insert body 39 formed with opposing notches 37 and 38 is mounted thereon.

In the second to thirteenth embodiments configured as described above, the same effects as in the first embodiment can be obtained. Further, in the embodiment shown in FIG. 7 shown in FIG. 9, two recesses are formed in the insert 24, so these two recesses can be used as holes for fixing the cutting tool holder. Furthermore, manufacturing is facilitated by setting the inclination angle at which the notch is formed in the insert to approximately 45°.

The present invention is not limited to the above-mentioned embodiments, and even if the shape of the tip body is a polygonal shape or a shape having a circular arc portion, the insert body corresponding thereto may also have a similar or similar shape, and the notch portion may be can be provided. Furthermore, the notch does not need to be perpendicular to the upper and lower surfaces of the insert, and may be formed in a tapered shape.

In addition, the present invention can be implemented with various modifications without changing the gist thereof.

〔Effect of the invention〕

As described above, the throw-away tip according to the present invention is made from a cutter material, and
A throw-away tip body having an outer circumferential surface having a predetermined shape and an inner circumferential surface similar to or similar to the outer circumferential surface concentrically with the outer circumferential surface to define a hollow portion; The tip is fixed to the hollow part of the throw-away tip body, has an outer circumferential surface substantially the same as the inner circumferential surface of the throw-away tip body, and is fixed to the tool holder in the thickness direction. and an insert having a through hole formed therethrough and a notch formed at a portion that abuts the inner portion of the throwaway tip body, so manufacturing of the insert is inexpensive and easy. Moreover, during cutting, it is possible to provide a throw-away tip that requires no effort to remove chips, is easy to maintain, and has a sufficient cooling effect and has a long life.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional throw-away tip, Fig. 2 is a partial perspective view showing the conventional throw-away tip in relation to a tool holder, and Fig. 3 is a plan view showing a conventional throw-away tip.
The figure is a partial plan view showing the first embodiment of the throw-away tip according to the present invention in relation to the tool holder.
It is a top view showing an example of. 1... Throwaway tip body (chip body), 2... Hole, 6... Insert body, 7... Notch,
11, 13, 15...notch, 12, 14, 16
...Insert body, 17...Chip body, 18, 20,
22, 23, 25, 26, 28...notch, 1
9, 21, 24, 27, 29... insert body, 30...
...Chip body, 31, 33, 35, 37, 38...
...notch, 32, 34, 36, 39...insert body.

Claims (1)

[Scope of Claims] 1. An object made of a cutter material, which has an outer circumferential surface of a predetermined shape, and an inner circumferential surface which is similar to or similar to the outer circumferential surface and is concentric with the outer circumferential surface to define a hollow part. a throwaway tip body having a surface formed thereon; and a throwaway tip body that is removably attached to a cutting tool holder, that is fixed to a hollow part of the throwaway tip body and that is substantially the same as the inner circumferential surface of the throwaway tip body. an insert body having an outer circumferential surface formed therein, a through hole penetrating in the thickness direction for being fixed to the tool holder, and a notch formed in a portion that abuts the inner shape of the throwaway tip body; A throw-away tip characterized by consisting of.