Iwaki, Japan
Iwaki, Japan

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An object of the present invention is to provide a cubic boron nitride sintered body and a coated cubic boron nitride sintered body which can elongate lifetime of a cutting tool or a wear resistant tool. The cubic boron nitride sintered body contains cubic boron nitride, a binder phase and inevitable impurities. An amount of the cubic boron nitride is 50% by volume or more and 80% by volume or less. A total amount of the binder phase and the inevitable impurities is 20% by volume or more and 50% by volume or less. The binder phase contains an Al compound and a Ti compound. The Al compound contains an Al element and at least one element selected from the group consisting of N, O and B. The Ti compound contains a Ti element and at least one element selected from the group consisting of C, N and B. When an X-ray diffraction intensity at a (100) plane of the AlN is made I_(1) and an X-ray diffraction intensity at a (104) plane of the Al_(2)O_(3) is made I_(2), then I_(1)/I_(2) is 6 or more and 40 or less. When a total area of the cubic boron nitride and the Al compound is made S1, and an area of a region at which the cubic boron nitride and the Al compound are continuously contacted is made S2, then S2/S1 is 0.98 or more and 1.00 or less.


Patent
Tungaloy Corporation | Date: 2016-09-14

Provide is a coated cutting tool having excellent wear resistance and fracture resistance, and having longer life than that of the conventional products. The coated cutting tool of the present invention comprises a substrate and a coating layer formed onto the surface of the substrate. The coating layer contains an type aluminum oxide layer. A residual stress value at the (116) plane of the type aluminum oxide layer is greater than 0. A residual stress value at the (012) plane of the type aluminum oxide layer is smaller than 0.


Patent
Tungaloy Corporation | Date: 2016-01-13

An object is to provide a coated cutting tool excellent in wear resistance and having a long tool life, and to provide a coated cutting tool which comprises a substrate and a coating layer, and at least one layer of the coating layer is a coarse grain layer wherein an average grain diameter Lx measured at the direction parallel to the interface of the coating layer and the substrate exceeds 200 nm, and a composition of which is represented by (Al_(a)Ti_(b)M_(c))X [wherein M represents at least one kind of an element of Zr, Hf, V, Nb, Ta, Cr, Mo, W, Y, B and Si, a represents an atomic ratio of an Al element based on a total of the Al element, a Ti element and an M element, b represents an atomic ratio of a Ti element based on a total of an Al element, the Ti element and an M element, X represents at least one kind of an element of C, N and O, c represents an atomic ratio of an M element based on a total of an Al element, a Ti element and the M element, and a, b and c each satisfy 0.30a0.65, 0.35b0.70, 0c0.20 and a+b+c=1.], and an average layer thickness of the coarse grain layer is 0.2 to 10 m.


Patent
Tungaloy Corporation | Date: 2016-10-12

A cutting tool (1) in the present invention includes a cutting edge member (3). The cutting edge member (3) forms a corner portion (2). The cutting edge member (3) includes a cutting edge (7) formed at the intersection of a rake surface (8) and a flank (9), at least two breaker wall surfaces (5) and at least one convex portion (6). The cutting edge (7) includes a first cutting edge (7b) and a second cutting edge (7a) connected thereto. The second cutting edge (7a) is situated at the corner portion (2). Each breaker wall surface (5) is formed to extend along the cutting edge. The convex portion (6) is formed between the two breaker wall surfaces (5) spaced from each other to protrude relatively toward the cutting edge side. A part of the convex portion (6) is situated around a connecting portion of the first and second cutting edges.


Patent
Tungaloy Corporation | Date: 2016-12-07

A coated cutting tool according to an aspect of the present invention comprises a substrate and a coating layer formed on a surface of the substrate. The coating layer comprises at least one -type aluminum oxide layer. In a cross-sectional surface of the -type aluminum oxide layer which is substantially parallel to the surface of the substrate, when an angle formed by a normal to the cross-sectional surface and a normal to a (222) plane of a particle of the -type aluminum oxide layer is regarded as a misorientation, and when areas of particles, each of which has a misorientation ranging from 0 degrees to 90 degrees, of the -type aluminum oxide layer are defined as constituting 100 area%, and the areas of particles, each of which has a misorientation ranging from 0 degrees to 90 degrees, of the -type aluminum oxide layer are divided into respective 10-degree pitches, a total Sa of the areas of particles, each of which has a misorientation ranging from 20 degrees to below 30 degrees, of the -type aluminum oxide layer is at a maximum from among totals of areas for nine divisions in respective 10-degree pitches.


The present invention relates to an insert attachment mechanism (100) for detachably attaching a cutting insert (2) to an insert attachment part (21) of a tool body (3). The insert attachment mechanism comprises an adjustment member (30) and a wedge member (10). The adjustment member (30) is arranged on an inner side of the cutting inset so as to act on the cutting insert in the insert attachment part. The adjustment member is advanceable and retractable in a direction of the central axis of a screw member (40) by rotating the screw member. The wedge member is arranged together with the cutting insert on the outer side of the adjustment member in the insert attachment part and attached so as to exert a pressing force against the cutting insert and an inner wall surface of the insert attachment part. The wedge member (10) is configured such that the screw member (40) is accessible from the outer side of the wedge member (10).


A plate member of a cutting tool has two side surfaces being substantially rectangular in shape, a top surface and a bottom surface extending in a direction along a long side of the rectangle, and two end surfaces in a short-side direction. A cutting edge is located on the side of one of the end surfaces. One of the side surfaces is a curved surface bulging outward. The bottom surface has an inclined portion which is inclined with respect to the top surface. The plate member is held by a tool block having a bottom restraining surface which comes into contact with the bottom surface, and is fastened to the tool block by using a clamp member having a top restraining surface which comes into contact with the top surface of the plate member. This allows adjustment of a projection length of a cutting edge while holding the plate member in a stable manner, thereby suppressing chatter vibration and improving the quality of a finished surface.


Patent
Tungaloy Corporation | Date: 2016-06-29

To obtain a coated cutting tool that has excellent chipping resistance, wear resistance, and fracture resistance and long tool life, a coated cutting tool, includes: a substrate; and a coating layer formed on a surface of the substrate, wherein the coating layer includes at least one layer of a Ti compound layer, the Ti compound layer is a compound containing a Ti element and at least one of element selected from the group consisting of C, N, O, and B, the Ti compound layer has a region surrounded by cracks when a polished surface approximately parallel to the surface of the substrate in the Ti compound layer is viewed from an upper surface, inside the region has an intermittent crack, one end or both ends of the crack not making contact with the cracks constituting the region, and relationship between an average number density A of the region and an average number density B of the intermittent crack satisfies 0.7 < B/A < 2.


Patent
Tungaloy Corporation | Date: 2016-11-02

An indexable roughing end mill capable of suppressing generation of chattering is provided. When the positions of cutting inserts (40) arranged in each spiral groove (28) are defined as a first segment to an n^(th) segment (where n is an integer of 2 or higher) from a leading end surface (22) side of a tool body (20) toward a base end surface (21) side, all of the angles (1...m (where m is an integer of 2 or higher)) between lines connecting a rotational axis (O) and the cutting inserts (40) in the first segments of the respective spiral grooves (28) are different from each other, as viewed from the leading end surface side of the tool body (20), and an angle (t) between the cutting insert (40) in the first segment and the cutting insert (40) in the n^(th) segment (the uppermost segment) in a spiral groove 28 is different from any of the angles 1 ...m (where m is an integer of 2 or higher) between the lines, as viewed from the leading end surface side of the tool body (20).


Patent
Tungaloy Corporation | Date: 2016-09-14

A cutting insert (1) of an aspect of the present invention includes at least one cutting edge (8) formed on an intersecting ridge line portion between a rake surface (6) and a flank (7), and at least one ridge (12). The cutting edge includes a cutting edge portion (9) extending along a corner portion (5) and a straight-line shaped cutting edge portion (10) connecting to the cutting edge portion (9). The ridge (12) is formed to rise on the rake surface (6). The ridge (12) extends from a portion of a rake surface inside the cutting edge portion of the corner portion toward a rake surface inside the straight-line shaped cutting edge portion.

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