JPH0717402U - Throw-away tip - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a chip capable of effectively preventing chipping of the chip and improving the safety of cutting. [Structure] A cutting edge portion 22 is formed at the tip,
The upper and lower abutting portions 24, 26 on the upper and lower sides of the rear end side of the cutting blade portion 22.
The upper contact portion 24 of the throw-away tip 20 supported by the holder by the upper and lower clamp portions 4 and 6 of the holder being brought into contact with the upper and lower contact portions 24 and 26.
Is composed of a V groove portion 28 and flat portions 30 formed on both sides of the V groove portion 28 and substantially orthogonal to the chip side surface 20a, and the width W3 of the V groove portion 28 is the same as the width W2 of the upper clamp portion 4 of the holder. Or, it is formed smaller.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a throw-away tip (hereinafter referred to as "tip") suitable for use as a cutting edge in grooving, parting and the like.

[0002]

[Prior art and its problems]

 6 and 7 show an example of the grooving tool, in which the chip 10 is fitted into the chip mounting seat 8 formed between the upper clamp part 4 and the lower clamp part 6 of the holder 2. ing.

As shown in FIGS. 7 to 9, this type of tip 10 has a cutting edge portion 12 having a predetermined width formed at its tip, and a rear end side portion (body portion) of the cutting edge portion 12 is formed. It is formed narrower than the cutting edge portion 12. Further, an upper contact portion 14 and a lower contact portion 16 on which the upper and lower clamp portions 4, 6 of the holder 2 are brought into contact are formed above and below the body portion. The upper and lower abutting portions 14 and 16 are both V-shaped, and both ends of the V-shaped groove are positive in which flat portions 18 having a minute width are formed. The width W1 of the V groove portion is substantially equal to the thickness Wt of the chip 10 (small by a small amount) and is larger than the width W2 of the upper and lower clamp portions 4 and 6.

When grooving or the like is performed using the tip 10 as described above, a part of the chips generated by the cutting edge portion 12 is generated between the upper clamp portion 4 of the holder 2 and the upper contact portion 14 of the tip 10. It enters into the space (B part in FIG. 9). The chips violently collide with the chip 10 as the work rotates, so that there is a problem that the chip causes a chip in the B portion of the chip 10 during the cutting process.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a chip that can effectively prevent chipping of the chip and improve the safety of cutting.

[0006]

[Means for Solving the Problems]

 According to the present invention, the cutting edge portion is formed at the tip portion, and the upper and lower abutting portions are formed on the upper and lower sides of the rear end side of the cutting edge portion so that the upper and lower clamp portions of the holder abut the upper and lower abutting portions. A throw-away tip supported by a holder by being squeezed, wherein the upper contact portion is composed of a V groove portion and flat portions formed on both sides of the V groove portion and substantially orthogonal to the side surface of the tip. The width of the V groove is equal to or smaller than the width of the upper clamp portion of the holder.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 2 and 3 show a chip according to an embodiment of the present invention, and FIG. 1 is a sectional view of the grooving tool having the chip shown in FIGS. 2 and 3 corresponding to FIG. 9 described above.

The tip 20 shown in these figures has a cutting edge portion 22 having a predetermined width formed on the tip side thereof, and the upper and lower clamp portions 4, 4 of the holder 2 are arranged above and below the rear edge side of the cutting edge portion 22. This is the same as the above-mentioned conventional chip in that the upper contact portion 24 and the lower contact portion 26 with which the 6 is abutted are formed.

However, the shapes of the upper contact portion 24 and the lower contact portion 26 of the chip 20 (particularly the shape of the upper contact portion) are different from the conventional ones, as will be described below. The upper contact portion 24 is composed of a V groove portion 28 having a V-shaped cross section, and flat carrier portions 30 formed on both sides of the V groove portion 28. The flat portion 30 is formed at an angle substantially orthogonal to the side surface 20a of the chip 20 (see FIG. 1), and both ends of the V groove portion 28 are negative. The width W3 of the V groove portion 28 is formed to be equal to or smaller than the width W2 of the upper clamp portion 4 of the holder 2. The width W5 of the flat portion 30 is preferably about 0.05 to 0.25 times the width W3 of the V groove portion 28. If it is less than 0.05 times, chipping of the tip 20 cannot be effectively prevented, and if it is more than 0.25 times, the clamping strength of the tip 20 to the holder is lowered, which is not preferable. is there.

Further, the shape of the lower contact portion 26 is made up of the V groove portion 32 and the flat portion 34, just like the shape of the upper contact portion 24. However, the width W4 of the V groove portion 32 may be the same as that of the V groove portion 28, or may be the same as that of the lower contact portion of the conventional chip. This is because the chip 20 is unlikely to chip on the side of the lower contact portion 26.

When performing deep grooving or the like with the grooving tool having the chip 20 mounted thereon, both sides of the V groove portion 28 of the upper contact portion 24 become negative flat portions 30 and both end sides of the upper contact portion 24. The rigidity of is significantly improved compared to conventional chips, and chip chipping due to chips during cutting can be effectively prevented. Then, by doing so, it becomes possible to improve the safety of cutting and perform stable cutting.

The tip according to the present invention can be applied not only to a grooving tool or the like that clamps using elastic deformation of a holder as shown in FIGS. 6 and 7, but also, for example, It goes without saying that the present invention can also be applied to a clamp-on type in which the movable portion 42 provided on the support portion 40 is tightened using the clamp bolt 44 as shown in FIGS. 4 and 5.

[0013]

[Effect of device]

 As described above, according to the chip of the present invention, the upper contact portion is composed of the V groove portion and the flat portions formed on both sides of the V groove portion and substantially orthogonal to the side surface of the chip. Since the width is formed to be the same as or smaller than the width of the upper clamp part of the holder, the rigidity of both ends of the upper contact part of the chip is improved, and chipping of the chip can be effectively prevented. The safety of cutting work can be improved and stable cutting work can be performed.

[Brief description of drawings]

1 is a cross-sectional view of a grooving tool equipped with the chips shown in FIGS. 2 and 3, corresponding to FIG. 9;

FIG. 2 is a side view of a chip according to an embodiment of the present invention.

FIG. 3 is a plan view of the chip.

FIG. 4 is a plan view showing an example of a clamp-on type grooving tool.

5 is a side view of the grooving tool of FIG. 4. FIG.

FIG. 6 is a plan view showing an example of a single clamp type grooving tool.

7 is a side view of the grooving tool of FIG.

FIG. 8 is a plan view of a conventional chip.

9 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 20 chip 22 cutting edge part 24 upper contact part 28 groove part 30 flat part

Claims (1)

[Scope of utility model registration request] 1. A cutting blade portion is formed at a tip end portion, and upper and lower abutting portions are formed above and below a rear end side of the cutting blade portion, and a vertical clamp portion of a holder abuts on the vertical contact portion. A throw-away tip supported by a holder by being squeezed, wherein the upper contact portion is composed of a V groove portion and flat portions formed on both sides of the V groove portion and being substantially orthogonal to the side surface of the tip, the V groove portion. The width of the insert is equal to or smaller than the width of the upper clamp portion of the holder.