JPH0128962Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a throw-away type cutting tool in which a cutting tip is attached to a cutting tool body via a cartridge.

[Conventional technology]

In general, with indexable tools where the cutting tip made of cemented carbide is attached directly to the tool body, if the cutting tip is chipped, the tool body will be damaged by the work material and the expensive tool itself will be discarded. The problem is that they have to be rejected.

Therefore, recently, when attaching the cutting tip to the cutting tool body, the cutting tip is attached via a cartridge. Examples of such throw-away type cutting tools include those shown in FIGS. 7 and 8, respectively.

In the indexable cutting tool shown in FIGS. 7A and 7B, a cartridge 2 is fixed to the tip of the tool body 1 with a bolt 3, and the cutting blade tip 5 placed on the tip seat 4 of the cartridge 2 is positioned. It is positioned by a member 6 and fixed by pressure by a clamper 7.

In addition, the throw-away type cutting tool shown in FIGS. 8A and 8B has a cartridge 12 fixed to the tip of the cutting tool body 11 with a bolt 13, and a cutting blade tip 15 placed on a tip seat 14 of the cartridge 12. is positioned by abutting against a reference surface 16 formed behind the tip seat 14 of the cartridge 12, and is pressed and fixed by a clamp portion 17 formed integrally with the cartridge 12.

[Problem that the invention attempts to solve]

In the former throw-away type cutting tool, a positioning member 6 is used to position the cutting tip 5.
Since we use , the number of parts increases accordingly.
There were problems in that it was expensive and time-consuming to manage. In particular, when the cartridge 2 is replaced with a cartridge in which the rake angle of the cutting edge tip 5 is a positive rake angle, the cutting edge 5a of the cutting edge tip 5
In order to keep the position of the positioning member 6 unchanged, the positioning member 6 had to be replaced with another one, making the above problem even more noticeable.

In addition, in the latter throw-away type cutting tool, the reference surface 16 for positioning the cutting edge tip 15 is formed behind the tip seat 14, so the reference surface 16 becomes an obstacle when machining the tip seat 14. ,
There was a problem in that machining the chip seat 14 was accompanied by great difficulty.

[Purpose of invention]

This invention was made in order to solve the above problems, and provides a throw-away type cutting tool that is inexpensive, can reduce the trouble of parts management, and can also easily form a chip seat. The purpose is to

[Structure of the idea]

In order to achieve the above object, this invention opens the rear end of the tip seat and provides a reference surface on which the rear end side of the cutting blade comes into contact with the tip of the cutting tool body facing this open part. It was designed so that it could be formed.

〔Example〕

Embodiments of this invention will be described below with reference to FIGS. 1 to 6.

Figures 1 to 3 show a throw-away type cutting tool for outer periphery grooving or parting off according to this invention.The throw-away type cutting tool shown in these figures also has a In this case, a cartridge 22 is attached with a bolt 23 so as to be replaceable. Cartridge 22
A tip seat 24 having a V-shaped cross section and sloping downward from the tip side to the rear end side is formed at the upper part of the tip side. Both the tip and rear ends of the tip seat 24 are open, and a reference surface 2 is provided at the tip of the cutting tool main body 21 facing the open portion on the rear end side.
5 and 26 are vertically spaced apart and formed with mutually different inclination angles. And Chipus 2
The cutting edge tip 27 placed on the cutting edge 4 has its rear end side surface 27c in contact with the reference surface 26, and is pressed and fixed by the clamper 28. In this fixed state, the cutting blade tip 27 is attached to the tip seat 2.
Corresponding to the fact that No. 4 has a downward slope, its rake angle is a positive rake angle. Note that the cutting blade tip 27 is the cutting blade 2 located on the tip side in FIG.
When the cutting edge 7a wears out, the cutting edge 27b on the rear end side can be used by changing the direction from front to back.

The cutting tool shown in FIG. 4 is an end grooving tool in which a cartridge 32 for end grooving is attached to the tool body 21 described above. Since this device is for end face grooving, it differs from the above embodiment in the following points. That is, the cartridge 32
The chip seat 34 is formed horizontally in order to prevent the cutting edge chip 37 placed thereon from interfering with the side surface of the groove being cut. For the same reason, the support portion 32a extending downward from the chip seat 34 of the cartridge 32 is formed to have the same radius of curvature as the radius of curvature of the groove to be cut.
Furthermore, the length l and front relief angle α of the cutting edge tip 37 are similar to those of the cutting edge tip 27, but the side relief angle γ (see FIG. 6) is set larger than that of the cutting edge tip 27. and the side relief angle γ
Since the height H is set large, if the height H is made too high, the contact area with the chip seat will be reduced, so its suitability H is set lower than the cutting edge chip 27. The cutting blade tip 37 configured in this manner is fixed in contact with a reference surface 25 different from the reference surface 26 that the cutting blade tip 27 contacts. In this fixed state, as shown in FIG.
is the cutting blade 27a when the cutting blade tip 27 is fixed.
It's starting to match. Other configurations are
Since it is similar to the above embodiment, similar parts will be given the same reference numerals and their explanation will be omitted.

Note that FIG. 5 shows the outer periphery grooving process according to the former embodiment, and FIG. 6 shows the end face grooving process according to the latter embodiment.

Therefore, in the above embodiment, since the cutting blade tips 27, 37 are brought into direct contact with the reference surfaces 25, 26 formed on the cutting tool body 21, the cost is lower than in the case where a positioning member is used. It is possible to do this at a low cost, and to reduce the effort involved in parts management. In particular, in this embodiment, as shown in FIG. 3, the mutual inclination angles of the reference surfaces 25 and 26 are changed, thereby bringing the cutting tips 27 and 37 into surface contact with the reference surfaces 25 and 26. This makes it possible to prevent the cutting blade tips 27, 37 from breaking. Incidentally, if only one reference surface is formed, the ridgeline portion of either of the cutting blade tips 27, 37 will come into line contact with the reference surface, so there is a risk that the ridgeline portion will be damaged.

In addition, since the reference surfaces 25 and 26 are formed on the cutting tool body 21 and the ridge end portions of the chip seats 24 and 34 are open, there is nothing that gets in the way when machining the chip seats 24 and 34. Gatsute Chipza 2
4 and 34 can be easily processed.

[Effect of idea]

As explained above, according to the throw-away type cutting tool of this invention, the rear end of the chip seat is opened, and the rear end side of the cutting blade tip is placed in contact with the tip of the tool body facing this opening. Since a contacting reference surface is formed, costs can be reduced, the effort of parts management can be reduced, and the chip seat can be easily formed, among other effects. .

[Brief explanation of the drawing]

Figure 1 shows an embodiment of this invention, and Figure 1A
is its front view, Figure 1B is its partially omitted side view,
2 shows the cutting tool body of the embodiment shown in FIG. 1, FIG. 2A is a front view thereof, FIG. 2B is a partially omitted side view, and FIG. 3 is an enlarged view of FIG. 2B. Fig. 4 shows another embodiment of this invention, Fig. 4A is a front view thereof, Fig. 4B is a partially omitted side view thereof, and Fig. 5 shows the cutting process using the cutting tool shown in Fig. 1. 5A is a side view thereof, FIG. 5B is a partially cutaway front view thereof, FIG. 6 is a cutting state using the cutting tool shown in FIG. 4, and FIG. 6A is a front view thereof.
FIG. 6B is a partially cutaway side view of the same, FIG. 7 is an example of a conventional throw-away type cutting tool, FIG. 7A is a front view thereof, FIG. 7B is a partially cutaway side view thereof, and FIG. FIG. 8 shows another example of a conventional indexable cutting tool, with FIG. 8A being a front view thereof and FIG. 8B being a partially omitted side view thereof. 21... Part-time tool body, 22, 32... Cartridge, 24, 34... Chip seat, 25, 26...
Reference plane, 27, 37...cutting tip.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A throw-away type cutting tool, in which a cartridge having a tip seat is replaceably attached to the tip of the cutting tool body, and a cutting tip is detachably attached to the tip seat of the cartridge,
A throw-away type cutting tool, characterized in that the rear end of the tip seat is open, and a reference surface is formed at the tip of the cutting tool body facing this open portion, on which the rear end side surface of the cutting blade comes into contact. . (2) The indexable cutting tool according to claim 1, wherein a plurality of the reference surfaces having different inclination angles are formed in a direction away from the tip seat.