JP2000326110A - Throw away tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw away tip capable of generating a welding in cutting a hardened steel and precisely setting a cutting blade to a prescribed shape. SOLUTION: A throw away tip has a cutting blade part 8 composed of an ultrahard sintered body 6 provided around a crossed ridge line between a cutting face 9 of a tip body 1 and a flank 10. A surface roughness Rz of the flank 10 in the crossed ridge line side of the cutting blade 8 is set in a range of at least 0.1 to 0.5 Z. The surface roughness Rz of a honing face 11 formed along the crossed ridge line of the cutting blade 8 is set in a range of 0.1 to 0.5 Z.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a throw-away chip (hereinafter, referred to as a chip) provided with a cutting edge portion by fixing an ultra-hard sintered body such as N or a diamond sintered body.

[0002]

2. Description of the Related Art In a chip of this type, a CBN sintered body or a diamond sintered body is formed in a recess formed at an intersection ridge line between a rake face and a flank face of a chip body made of a hard material such as cemented carbide. The cutting edge tip, which is formed of a super-hardened sintered body and a cemented carbide in a layered form, is fixed by brazing so that the super-hardened sintered body portion is located at the intersection ridge portion, and cut. The thing which formed the blade part is known. And
In such a tip, the rake face or flank is polished after brazing of the cutting edge tip to set the cutting edge in a predetermined shape, or the honing surface is formed by polishing along the crossing ridgeline. Has been done.

[0003]

The rake face, flank face, or honing face is usually polished by a grindstone.
The honing surface and flank after polishing are as large as about 1.5Z at maximum in surface roughness Rz of the ten-point average roughness specified in JIS B 0601, and the processing direction such as rotation and feed of the grinding wheel during polishing is constant. Therefore, surface properties such as uneven surface roughness are left on the polished surface in accordance with the processing direction, thereby cutting relatively hard material such as hardened steel. In some cases,
There is a problem in that welding tends to occur on the honing surface or the flank surface, and the loss of the cutting edge is promoted.
In addition, when the surface roughness of the honed surface or the flank after polishing is large, it is also difficult to strictly set the shape of the cutting edge formed at the intersection ridge line of these surfaces to a desired shape. I will.

The present invention has been made under such a background, and does not cause welding or the like even when cutting hardened steel or the like, and it is possible to set the cutting edge shape more precisely to a predetermined shape. The aim is to provide a possible chip.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve such an object, the present invention provides an ultra-high-hardness sintering method in the vicinity of an intersection ridge line between a rake face and a flank face of a chip body. A chip having a cutting edge portion formed of a body and having a honing surface formed along the intersecting ridgeline on the cutting edge portion has a surface roughness Rz of the honing surface of 0.1 to 0.1.
In a chip set to a range of 5Z and provided with a cutting edge portion made of an ultra-hard sintered body around an intersection ridge line between a rake face and a flank face of the tip body, at least the intersection of the cutting edge portion is provided. Surface roughness Rz of the flank on the ridge side
Is set in the range of 0.1 to 0.5Z, or a cutting edge portion made of an ultra-hard sintered body is provided around the intersection ridge line between the rake face and the flank face of the chip body. Is a chip having a honing surface formed along the intersection ridge line, wherein the honing surface has a surface roughness Rz of 0.1 to
0.5Z, and at least the surface roughness R of the flank on the side of the intersection ridge line of the cutting edge portion.
z is set in a range of 0.1 to 0.5Z.

Therefore, in the chip having the above-described structure, the surface roughness Rz of the honing surface and the flank is 0.1%.
Since it is set smaller than the conventional tip of 0.5Z, the sliding friction of chips on these honing surfaces and flank surfaces can be reduced, and the occurrence of welding to the honing surfaces and flank surfaces can be prevented. In addition to this, the shape of the cutting edge formed on the ridge of the honing surface or the flank can be set more precisely and microscopically to a predetermined shape, and the processing accuracy by the tip is improved. It becomes possible. Further, in order to set the surface roughness Rz of the honing surface and the flank surface as small as 0.1 to 0.5Z as described above, for example, super-abrasive grains such as fine diamond are adhered to the brush surface or the brush bristles themselves are used. Or a method of polishing these surfaces with this brush.However, such a method is less likely to cause unevenness in the surface roughness depending on the processing direction, such as polishing with a grindstone. Welding does not easily occur depending on the surface properties.

[0007]

FIG. 1 and FIG. 2 show an embodiment of the present invention. In these figures, reference numeral 1 denotes a chip main body formed in a polygonal flat plate shape (a triangular flat plate shape in the present embodiment) from a hard material such as a cemented carbide. A recess 4 having an L-shaped cross section is formed at a corner portion of a triangle formed by the upper surface 2 at the intersection ridge line with the peripheral surface 3 so as to be recessed one step from the upper surface 2. Has a cutting blade tip 5
Is attached. The cutting edge chip 5 is a layered sintered body in which an ultra-high hardness sintered body 6 made of a CBN sintered body or a diamond sintered body and a cemented carbide 7 are laminated and formed. The super-hardened sintered body 6 is fixed to the recess 4 by brazing the cemented carbide 7 toward the upper surface 2 side of the chip body 1, and is thereby fixed to the corner portion of the chip body 1. A cutting blade 8 is provided.

[0008] In the cutting edge portion 8, the cutting edge tip 5
Of the super-hard sintered body 6 at the intersection of the rake face 9 connected to the upper surface 2 of the chip body 1 and the flank 10 connected to the peripheral face 3, the rake face 9 and the flank 10 The honing surface 11 is formed so as to extend along the intersection ridge line at a constant width so as to intersect at an obtuse angle. Note that the chip of the present embodiment is a so-called negative chip in which the rake face 9 and the flank 10 are arranged in a direction orthogonal to each other.

In the present embodiment, the surface roughness of the honing surface 11 is 0.1 to 0.5Z at a surface roughness Rz of a ten-point average roughness specified in JIS B0601.
Is set in the range. The surface roughness of the flank 10 is also in the range of 0.1 to 0.5Z in the surface roughness Rz of the ten-point average roughness similarly specified in JIS B0601. In this manner, the surface roughness Rz of the flank 10 and the surface roughness Rz of the honing surface 11 are set to 0.1 to 0.5.
In order to make the range of 5Z, for example, super-abrasive grains such as fine diamonds are adhered to the surface of the brush bristles through an appropriate compound, or such super-abrasive grains are applied to a resin material or the like forming the brush bristles. The flank 10 and the honing surface 11 may be polished by the kneading so that the flank 10 and the honing surface 11 can be polished by the brush itself.

However, in the chip having such a configuration, the flank 10 of the cutting blade 8 and the honing surface 1
1 is formed on an extremely smooth surface having a surface roughness Rz of 0.1 to 0.5Z, so that even if chips generated during cutting are in sliding contact with the flank 10 or the honing surface 11, the sliding is Kinetic friction can be suppressed, and even when cutting a relatively hard work material such as hardened steel, it is possible to prevent the flank 10 and the honing surface 11 from being welded by scraping of chips. Thus, the cutting edge 8 can be prevented from being lost due to such welding, and the tip life can be extended. Also, as described above, the flank 10 and the honing surface 1
By smoothing the surface roughness Rz of No. 1, it is possible to microscopically and more precisely give a predetermined shape to the cutting edge formed on the ridge portion of the flank 10 or the honing surface 11, Preventing the welding prevents damage to the processed surface, and also improves the processing accuracy of the chip.

Further, when forming the flank 10 and the honing surface 11, for example, as described above, super-abrasive grains such as diamond are adhered to the brush bristles or held on the brush bristles. By polishing the flank 10 and the honing surface 11, the flank 10 and the honing surface 11 can be finished to such a smooth surface roughness Rz. In addition, in the flank 10 and the honing surface 11 polished as described above, there is little deviation in the surface roughness depending on the processing direction as in the polishing with a grindstone. In this direction, welding does not easily occur on the flank 10 and the honing surface 11, and the welding of chips can be more reliably prevented.

Here, in the chip of the present embodiment,
As described above, the surface roughness of the flank 10 and the honing surface 11 is set in the range of 0.1 to 0.5Z in the surface roughness Rz of the ten-point average roughness specified in JIS B0601. If the surface roughness Rz is greater than 0.5Z, the effect of preventing the above-mentioned welding may not be sufficiently effective, while no further improvement in the effect can be recognized even if the surface roughness Rz is smaller than 0.1Z. It is rather uneconomical to finish the flank 10 and the honing surface 11 extremely smoothly. In order to more effectively achieve the above-described effect of preventing welding while considering economic efficiency, the surface roughness Rz of the flank 10 and the honing surface 11 must be
It is more desirable to set in the range of 0.2 to 0.4Z.

In the insert of the present embodiment, both the flank 10 and the honing surface 11 of the cutting edge 8 are set so that the surface roughness Rz is in the range of 0.1 to 0.5Z. However, for example, only the flank 10 is set to have a surface roughness Rz of 0.1 to 0.5Z, or only the honing surface 11 has a surface roughness Rz of 0.1 to 0.5Z. Or at least the surface roughness Rz
Is effective because it is possible to prevent welding on the surface where is set to 0.1 to 0.5Z. For example, the chip of the present embodiment is a negative chip, but in the case of a positive chip, a large clearance angle can be secured on the clearance surface 10.
Only the honing surface 11 has a surface roughness Rz of 0.1 to 0.5.
Z may be set.

Conversely, the surface roughness Rz of the flank 10 is set to 0.1
Even if it is set to 0.5Z, the chip body 1
It is not necessary to set the entire surface of the flank 10 reaching the peripheral surface 3 to such a surface roughness Rz, and at least the portion on the side of the intersection ridge line with the rake face where it is difficult to secure the amount of clearance between the flank 10 and the work material. May be set to 0.1 to 0.5Z. When only the flank 10 is set so that the surface roughness Rz is in the range of 0.1 to 0.5Z, the honing surface 11
Need not be formed. Furthermore, not only the flank 10 and the honing surface 11 but also the rake face 9 of the cutting edge 8 may be set so that the surface roughness Rz is in the range of 0.1 to 0.5Z.

[0015]

As described above, according to the present invention,
The surface roughness Rz of the honing surface formed on the flank of the cutting edge portion or the intersection ridge line between the flank and the rake surface is 0.1 to 0.1.
By setting to 5Z, it is possible to prevent chips from welding to these surfaces, prevent chipping from occurring on the cutting edge portion, extend the life of the chip, and damage the machined surface of the work material. And high processing accuracy can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the vicinity of a cutting blade 8 of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tip main body 5 Cutting edge tip 6 Ultra-high-hardness sintered body of cutting edge tip 5 7 Cemented carbide of cutting edge tip 5 8 Cutting edge 9 Rake surface 10 Flank 11 Honing surface

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kyoichi Takahara 1528 Nakashinda, Yokoi, Kobe-cho, Anpachi-gun, Gifu Prefecture F-term in Mitsubishi Materials Corporation Gifu Works (reference) 3C046 CC02 CC08 FF07 FF16 FF35 HH04 HH08

Claims (3)

[Claims] 1. A cutting edge portion made of an ultra-hard sintered body is provided around an intersection ridge line between a rake face and a flank surface of a chip body, and a honing surface along the intersection ridge line is provided on the cutting edge portion. A throwaway tip formed, wherein the surface roughness Rz of the honing surface is set in a range of 0.1Z to 0.5Z. 2. A throw-away chip having a cutting edge portion made of an ultra-hard sintered body provided around an intersection ridge line between a rake face and a flank face of a tip body, wherein at least the intersection ridge line of the cutting edge portion is provided. Wherein the surface roughness Rz of the flank on the side is set in the range of 0.1 to 0.5Z. 3. A cutting edge portion made of an ultra-hard sintered body is provided around an intersection ridge line between a rake face and a flank face of the chip body, and a honing surface along the intersection ridge line is provided on the cutting edge portion. In the formed throw-away insert, the surface roughness Rz of the honing surface is set in the range of 0.1 to 0.5Z, and at least the surface roughness of the flank on the side of the intersection ridge line of the cutting edge portion. Rz is 0.1 ~
A throw-away tip characterized by being set in the range of 0.5Z.