Tungaloy Corporation

Iwaki, Japan

Tungaloy Corporation

Iwaki, Japan
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Patent
Tungaloy Corporation | Date: 2017-02-01

The present invention provides an insert, for use in rotary cutting, which has a corner cutting edge that is resistant to fracture. A cutting insert (1) has an upper surface (11), a lower surface (21), and a side surface (31) connecting the upper and lower surfaces, and an intersecting edge between the upper surface and the side surface is provided with a cutting edge (4). The cutting edge comprises a second major cutting edge (42), a first major cutting edge (43), a corner cutting edge (41) connected to these major cutting edges, and a flat cutting edge (44), in the order mentioned. An angle () formed by the second major cutting edge and the first major cutting edge is an obtuse angle. An interior angle () formed by the flat cutting edge and the first major cutting edge is larger than an interior angle () formed by the flat cutting edge and the second major cutting edge. A land (12) is provided adjacent to the first major cutting edge on the upper surface and the width of the land (12) increases toward the first corner cutting edge.


Patent
Tungaloy Corporation | Date: 2017-01-18

A cutting insert capable of suppressing shifting of the cutting insert during cutting is provided. A cutting insert having first and second end surfaces and a peripheral side surface comprises: a cutting edge which includes at least one circular-arc-shaped cutting edge; and a contact surface portion formed in the second end surface. When a reference axis A is defined as a line passing through the center of the first end surface and being perpendicular to the first end surface, and when a virtual circle is defined so that the virtual circle includes, as its arc, a first circular-arc-shaped cutting edge in a plan view, the center E of the virtual circle is apart from the reference axis A. When a first reference plane B is defined as a plane including the reference axis A and extending through the center of the virtual circle; a second reference plane C is defined as a plane extending perpendicularly to the reference axis A; and a virtual plane D is defined as a plane orthogonal to both the first reference plane B and the second reference plane C and extending so as to intersect with the first circular-arc-shaped cutting edge and traverse the contact surface portion, the contact surface portion has, in the virtual plane D, an inclined portion which gradually becomes more distant from the second reference plane C heading from one end to the other.


Patent
Tungaloy Corporation | Date: 2017-02-01

This is to provide a coated tool which can elongate tool life than those of the conventional tools. The coated tool comprises a substrate and a coating layer formed on a surface of the substrate. The coating layer contains a first laminated structure and a second laminated structure. The first laminated structure and the second laminated structure are continuously laminated twice or more alternately. The first laminated structure contains at least two kinds of layers having different compositions, and the two kinds of the layers are alternately laminated twice or more. An average thickness of the layers contained in the first laminated structure is 60 nm or more and 500 nm or less. The second laminated structure contains at least two kinds of layers having different compositions, and the two kinds of the layers are alternately laminated twice or more. An average thickness of the layers contained in the second laminated structure is 2 nm or more and less than 60 nm. The layers contained in the first laminated structure and the second laminated structure contain a compound comprising at least one metal element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si, Sr, Y, Sn and Bi, and at least one non-metal element selected from the group consisting of carbon, nitrogen, oxygen and boron. An average thickness(es) of the first laminated structure and/or the second laminated structure is/are continuously or stepwisely reduced from the substrate side toward the surface side of the coating layer.


Patent
Tungaloy Corporation | Date: 2017-02-15

This is to provide a coated tool which can be used for cutting for a long period of time. The coated tool comprises a substrate and a coating layer formed on a surface of the substrate. The coating layer contains a first laminated structure and a second laminated structure. The first laminated structure and the second laminated structure are continuously laminated twice or more alternately. The first laminated structure contains at least two kinds of layers having different compositions, and the two kinds of the layers are alternately laminated twice or more. An average thickness of the layers contained in the first laminated structure is 60 nm or more and 500 nm or less. The second laminated structure contains at least two kinds of layers having different compositions, and the two kinds of the layers are alternately laminated twice or more. An average thickness of the layers contained in the second laminated structure is 2 nm or more and less than 60 nm. The layers contained in the first laminated structure and the second laminated structure contain a compound comprising at least one metal element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si, Sr, Y, Sn and Bi, and at least one non-metal element selected from the group consisting of carbon, nitrogen, oxygen and boron. An average thickness(es) of the first laminated structure and/or the second laminated structure is/are continuously or stepwisely increased from the substrate side toward the surface side of the coating layer.


Patent
Tungaloy Corporation | Date: 2017-03-29

A plurality of grooves (27) is formed and a plurality of insert seats (28) is formed in each of the grooves, and cutting inserts (30) are removably arranged onto the insert seats (28). The cutting insert (30) has a major cutting edge (34), a corner cutting edge, and a minor cutting edge (35). The major cutting edge (34) is formed in a wave shape as viewed from a direction of a rake surface. The cutting inserts (30) are arranged such that, in rotational trajectories formed by the major cutting edges (34) of the respective cutting inserts (30) when a roughing cutter (10) is rotated around a rotational axis (O), the phases of the waves of the rotational trajectories formed by the cutting inserts (30) that are adjacent to each other in a direction along the rotational axis O coincide with each other in one groove (27), and such that the rotational trajectories of at least part of cutting edge portions of at least some cutting inserts (30) are overlapped with each other in the direction of the rotational axis (O). Accordingly, even when the cutting edge portion is used as a major cutting edge and as an inner cutting edge, it is still possible to reduce cutting load and suppress breakage.


Patent
Tungaloy Corporation | Date: 2017-01-04

The present invention provides a tool body (20) for use in an indexable rotary cutting tool, the tool body (20) having a rotational axis and a substantially cylindrical shape. Spiral grooves (28) are formed so as to extend from a base end side of the tool body to a leading end side in a peripheral surface (23) of the tool body. The spiral grooves (28) each have a plurality of insert seats (30) formed so as to be shifted from each other from the base end side toward the leading end side. The insert seats (30) each have a bottom surface (31) and first and second side surfaces (32, 33) that extend so as to intersect with the bottom surface (31). The first side surface (32) faces the base end side of the tool body (20), and the second side surface (33) faces the leading end side of the tool body (20) and is located on the base end side with respect to the first side surface (32). In at least one insert seat (30) located closer to the base end side with respect to an insert seat (30) located closest to the leading end side of the tool body (20), a length (L1) of the first side surface (32) is longer than a length (L2) of the second side surface (33).


Patent
Tungaloy Corporation | Date: 2017-04-05

The present invention provides a cutting insert comprising: a first end surface (11) and a second end surface (21) opposing the first end surface; a side surface (31) connecting the first end surface and the second end surface; and at least one cutting edge (11 E) extending on an intersecting edge between the first end surface and the side surface. The cutting edges each include: a corner cutting edge (41) extending at a corner (11 C) of the first end surface; and a major cutting edge (41 a) connected to the corner cutting edge. A rake surface (13) formed along the cutting edge on the first end surface is inclined toward the second end surface as the distance from the cutting edge increases. In a side view of the cutting insert, the major cutting edge includes an inclined part which is inclined so as to approach the second end surface from the corner cutting edge. A portion of the rake surface along the inclined part is formed such that an angle of inclination toward the second end surface increases toward the corner in a direction along the intersecting edge between the first end surface and the side surface.


Patent
Tungaloy Corporation | Date: 2017-01-18

A cutting insert which is less prone to fracture is provided in consideration of the arrangement of wiper edges. A cutting insert comprises two opposing first and second end surfaces (2, 3) whose contour shapes are each substantially polygonal and a peripheral side surface (4) connecting these end surfaces, wherein a corner cutting edge (6), a first cutting edge (7), a second cutting edge (8), which is on the side opposite to the first cutting edge with respect to the corner cutting edge, and a wiper edge (9) formed between the second cutting edge and the corner cutting edge, are formed at least in part of an intersecting edge between the first end surface and the peripheral side surface. In the peripheral side surface, when regarding a side surface part of the wiper edge as a wiper-edge side surface (14) and a direction perpendicular to the second cutting edge as a direction V as viewed from a direction facing the first end surface, in a side view from the direction V, the boundary of the wiper-edge side surface which is close to the second side surface is inclined with respect to a direction perpendicular to the first end surface, and the wiper-edge side surface has a constant width between the first and second end surfaces.


Patent
Tungaloy Corporation | Date: 2017-01-04

A cutting insert capable of simultaneously achieving high-feed machining and finishing is provided. The cutting insert has an upper surface (21), a lower surface (91) and a side surface (61) that connects the two surfaces, and a cutting edge is formed at an intersecting edge between the upper surface (21) and the side surface (61). The cutting edge is at least comprised of a major cutting edge (33), a corner edge (34) connected to the major cutting edge (33), and a curved wiper edge (35) located on the opposite side of the major cutting edge (33) across the corner edge (34). The angle made by the major cutting edge (33) and the chord of the wiper edge (35) is 155<180, and a positive land is formed in the wiper edge (35).


Patent
Tungaloy Corporation | Date: 2017-03-29

This is to provide a cemented carbide and a coated cemented carbide having excellent fracture resistance when they are used as cutting tools. The cemented carbide comprises 85% by mass or more and 97% by mass or less of a hard phase and 3% by mass or more and 15% by mass or less of a binder phase. A main component of the hard phase is tungsten carbide. The binder phase contains Co, and at least one kind of a platinum group element selected from the group consisting of Ru, Rh, Pd, Os, Ir and Pt. In the peaks of the Co obtained by an X-ray diffraction analysis, an intensity I_(Coc) of a (200) plane of cubic Co and an intensity I_(Coh) of a (101) plane of hexagonal Co satisfy a relation of the following formula.

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