JP2007283487A - Throwaway tip and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throwaway tip capable of more strictly setting a cutting blade shape in a specified shape without causing welding even in cutting hardened steel, etc. <P>SOLUTION: Surface roughness Rz of a honing surface 11 is set in a range of 0.1 to 0.5Z by setting surface roughness Rz of a flank 10 at least on the crossing crest line side of the cutting blade part 8 in a range of 0.1 to 0.5Z and forming the honing surface 11 along the crossing crest line of this cutting blade part 8 on this throwaway tip on which the cutting blade part 8 made of a cemented carbide sintered body 6 in a periphery of the crossing crest line part of a rake face 9 and the flank 10 of a tip main body 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a throw-away tip (hereinafter referred to as a tip) provided with a cutting edge portion by attaching an ultra-high hardness sintered body such as CBN or a diamond sintered body to a chip body. .

  In this type of chip, an ultra-high height made of a CBN sintered body or a diamond sintered body is formed in a recess formed at the crossing ridge line portion of the rake face and the flank face of a hard body made of a hard material such as a cemented carbide. The cutting edge part formed by laminating a hard sintered body and a cemented carbide layer into a layer was fixed by brazing so that the ultra-high hardness sintered body part was located at the intersecting ridge line part to form a cutting edge part. Things are known. And in such a chip, after brazing the cutting edge chip, the rake face and the flank face are polished to set the cutting edge to a predetermined shape, or the honing surface is formed by polishing along the intersecting ridge line. To be done.

  By the way, such a rake surface, flank surface, or honing surface is usually polished by a grindstone. In such a grindstone, the honed surface or flank surface after polishing is a ten-point average roughness specified in JIS B 0601. The surface roughness Rz is as large as about 1.5Z at the maximum, and the processing direction such as the rotation and feed of the grinding wheel during polishing is constant, so that the surface roughness is uneven depending on the processing direction. As a result, the surface of the honing surface or the flank surface is likely to be welded, especially when cutting a relatively hard material such as hardened steel. There is a problem that the loss of the blade is promoted. Further, when the surface roughness of the honing surface and flank after polishing is large in this way, it becomes difficult to set the shape of the cutting blade formed on the intersecting ridge line of these surfaces to a strictly desired shape. End up.

  The present invention has been made under such a background, and does not cause welding or the like in cutting hardened steel or the like, and can further accurately set the cutting edge shape to a predetermined shape. The purpose is to provide.

  In order to solve the above problems and achieve such an object, according to the present invention, a cutting edge portion made of an ultra-high hardness sintered body is provided around the intersection ridge line portion between the rake face and the flank face of the chip body. In the tip formed by forming a honing surface along the intersecting ridge line in the cutting edge portion, the honing surface has a surface roughness Rz set in a range of 0.1 to 0.5 Z, and the tip body is raked. In a chip in which a cutting edge portion made of an ultra-high hardness sintered body is provided around the intersection ridge line portion between the surface and the flank surface, the surface roughness Rz of the flank surface at least on the intersection ridge line side of the cutting edge portion is set. A cutting edge portion made of an ultra-high hardness sintered body is provided around the intersecting ridge line portion between the rake face and the flank face of the chip body. A channel formed by forming a honing surface along the crossing ridgeline. The surface roughness Rz of the honing surface is set in a range of 0.1 to 0.5Z, and at least the surface roughness Rz of the flank on the side of the intersecting ridge line of the cutting edge is 0.1 to 0.5Z. It is characterized by being set in a range of 0.5Z.

  Therefore, in the tip configured as described above, the surface roughness Rz of the honing surface and the flank is set to 0.1 to 0.5 Z, which is smaller than that of the conventional tip. It is possible to reduce the sliding friction of chips, and to prevent the occurrence of welding on the honing surface and flank surface, and the shape of the cutting blade formed on the ridge line part of these honing surface and flank surface Can be set to a predetermined shape microscopically and strictly, and it is possible to improve the processing accuracy of the chip. Further, in order to set the surface roughness Rz of the honing surface and the flank as small as 0.1 to 0.5 Z in this way, for example, superabrasive grains such as fine diamond are adhered to the brush surface or the brush hair itself In this method, the surface roughness is less likely to be biased depending on the processing direction as in the case of polishing with a grindstone. The surface property does not easily cause welding.

  As described above, according to the present invention, the surface roughness Rz of the honing surface formed at the flank face of the cutting edge part or the intersecting ridge line part between the flank face and the rake face is set to 0.1 to 0.5Z. By setting, chip welding to these surfaces can be prevented, chipping can be prevented and chip life can be extended, and the work surface of the work material can be damaged. It is possible to prevent this and obtain high processing accuracy.

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

  In this cutting edge portion 8, an ultra-high hardness sintered body 6 portion of the cutting edge tip 5 has an intersecting ridge line portion between a rake face 9 continuous with the upper surface 2 of the chip body 1 and a flank face 10 continuous with the peripheral surface 3. In addition, the honing surface 11 is formed to extend along the intersecting ridgeline with a constant width so as to intersect the rake face 9 and the flank face 10 at an obtuse angle. The chip of this embodiment is a so-called negative chip in which the rake face 9 and the flank face 10 are disposed in a direction orthogonal to each other.

  And in this embodiment, the surface roughness of this honing surface 11 is set to the range of 0.1-0.5Z in the surface roughness Rz of ten-point average roughness prescribed | regulated to JISB0601. Further, the surface roughness of the flank 10 is also in the range of 0.1 to 0.5 Z in the surface roughness Rz of 10-point average roughness similarly defined in JIS B 0601. In order to set the surface roughness Rz of the flank 10 and the surface roughness Rz of the honing surface 11 in the range of 0.1 to 0.5 Z in this way, for example, superabrasive grains such as fine diamond are appropriately compounded. These flank surfaces can be attached to the surface of the brush hair via the brush, or held on the brush hair itself by kneading such superabrasive grains into a resin material or the like that forms the hair of the brush. 10 and the honing surface 11 may be polished.

  Thus, in the chip configured as described above, the flank 10 and the honing surface 11 of the cutting edge 8 are formed on a very smooth surface with a surface roughness Rz of 0.1 to 0.5Z. Therefore, even if chips generated at the time of cutting come into sliding contact with the flank 10 or the honing surface 11, the sliding friction can be suppressed, and even when cutting a relatively hard work material such as hardened steel Even so, it is possible to prevent welding from occurring on the flank 10 and the honing surface 11 due to scraping of the chips, and it is possible to prevent chipping of the cutting edge portion 8 due to such welding and to extend the chip life. . In addition, since the surface roughness Rz of the flank 10 and the honing surface 11 is smoothly finished as described above, the cutting edges formed on the ridge line portions of the flank 10 and the honing surface 11 are more strictly microscopically. It is possible to give the chip a predetermined shape, and it is possible to improve the processing accuracy by the chip in combination with preventing the processing surface from being damaged by preventing welding.

  Further, when forming the flank 10 and the honing surface 11, for example, as described above, diamond or other superabrasive particles are attached to or held by the brush bristles, and the flank by this brush. By polishing 10 and the honing surface 11, it becomes possible to finish the flank 10 and the honing surface 11 with such a smooth surface roughness Rz. In addition, the flank 10 and the honing surface 11 polished in this way are less likely to be uneven in surface roughness depending on the processing direction as in the case of polishing with a grindstone, and therefore are specified by the surface properties that cause such deviation. In this direction, welding does not easily occur on the flank 10 and the honing surface 11, and it becomes possible to more reliably prevent chip welding.

  Here, in the chip of the present embodiment, the surface roughness of the flank 10 and the honing surface 11 is 0.1 to 0. 0 in the surface roughness Rz of 10-point average roughness defined in JIS B 0601. Although it is set in the range of 5Z, if the surface roughness Rz is so large that it exceeds 0.5Z, the above-mentioned effect of preventing welding may not be sufficiently achieved, while it becomes small as it falls below 0.1Z. However, no further improvement in the effect is recognized, and it is rather uneconomical to finish the flank 10 and honing surface 11 very smoothly. Note that the surface roughness Rz of the flank 10 and the honing surface 11 is in the range of 0.2 to 0.4 Z in order to achieve the effect of preventing the welding more reliably while considering the economy. It is more desirable to set to.

  Moreover, in the chip | tip of this embodiment, both the flank 10 and the honing surface 11 of the said cutting-blade part 8 are set so that the surface roughness Rz may become the range of 0.1-0.5Z. However, for example, only the flank 10 is set so that the surface roughness Rz is 0.1 to 0.5Z, or only the honing surface 11 is set so that the surface roughness Rz is 0.1 to 0.5Z. However, it is effective because it is possible to prevent welding at least on the surface having the surface roughness Rz of 0.1 to 0.5Z. For example, although the chip of this embodiment is a negative chip, since a large clearance angle can be secured on the flank 10 in the case of a positive chip, only the honing surface 11 has a surface roughness Rz of 0.1 to 0.5Z. You may set so that.

  On the other hand, even when the surface roughness Rz of the flank 10 is set to 0.1 to 0.5Z, the entire flank 10 that reaches the peripheral surface 3 of the chip body 1 does not necessarily have such a surface roughness Rz. It is not necessary to set, and at least the portion on the side of the intersecting ridge line with the rake face where it is difficult to ensure the clearance with the work material may be set to 0.1 to 0.5Z. In addition, when only the flank 10 is set so that the surface roughness Rz is in the range of 0.1 to 0.5 Z, the honing surface 11 does not have to 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.

It is a perspective view which shows one Embodiment of this invention. It is sectional drawing of the cutting blade part 8 periphery of embodiment shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tip body 5 Cutting edge tip 6 Super-hard sintered body of cutting edge tip 5 7 Cemented carbide of cutting edge tip 8 Cutting edge portion 9 Rake face 10 Relief face 11 Honing face

Claims (3)

  A cutting edge portion made of an ultra-hard sintered body is provided around the intersection ridge line portion between the rake face and the flank face of the chip body, and a honing surface is formed on the cutting edge portion along the intersection ridge line. In the away tip, the throw away tip is characterized in that the surface roughness Rz of the honing surface is set in a range of 0.1Z to 0.5Z.   In the throw-away tip in which a cutting edge portion made of a super-hard sintered body is provided around the intersection ridge line portion between the rake face and the flank surface of the chip body, at least the flank surface on the side of the intersection ridge line of the cutting edge portion The throwaway tip is characterized in that the surface roughness Rz is set in the range of 0.1 to 0.5Z.   A cutting edge portion made of an ultra-hard sintered body is provided around the intersection ridge line portion between the rake face and the flank face of the chip body, and a honing surface is formed on the cutting edge portion along the intersection ridge line. In the away tip, the surface roughness Rz of the honing surface is set in a range of 0.1 to 0.5 Z, and the surface roughness Rz of the flank at least on the intersecting ridge line side of the cutting edge is 0. A throw-away tip that is set in a range of 1 to 0.5Z.

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