摘要:
A cutting tool holder blade is formed of hard metal, having a front plane, a perpendicular mid-plane. An insert pocket of the holder blade has a base jaw and a clamping jaw resiliently connected to the base jaw in a unitary one piece construction. The base jaw has a base jaw abutment surface and the clamping jaw has a clamping surface facing opposite the base jaw abutment surface, and an insert stop surface. A curved inner surface extends from the base jaw abutment surface towards and along the clamping jaw, the curved inner surface having a front extremity portion. The clamping jaw is narrowed down adjacent the front extremity portion, such that the clamping surface overhangs the front extremity portion of the curved inner surface, in a direction towards the base jaw and away from the front plane. The holder blade may be formed of cemented carbide.
摘要:
A holder and a cutting tool with the holder including an insertion hole at a front end part thereof, and a cutting insert that includes a cutting edge part and a shank part. The shank part has substantially a rod shape. A part of the shank part is immovably located in the insertion hole. The front end part of the holder includes a first curved surface part that becomes wider from a front end toward a back side when viewed from a side thereof. The first curved surface part includes: a curved line that extends from an edge of an opening of the insertion hole toward the back side; or a straight line that extends from the edge of the opening of the insertion hole and connects to a curved line that extends continuously from the straight line toward the back side without an angular part.
摘要:
A cutting tool 1 includes a cutting edge 2, a rake face 4 and a flank 5 and is used for cutting a surface of a cylindrical or columnar work W by a skiving process. The cutting tool 1 is configured to satisfy a relational expression: tan−1(cos β/cos(α−β)×tan−1(cos−1(r′/r))
摘要:
In a cutting tool having an indexable cutting insert with exactly four cutting portions, the cutting insert is removably securable to an insert holder by a fastener. The cutting insert has two opposing end surfaces with a peripheral side surface extending therebetween, and each cutting portion has a major cutting edge formed by the intersection of a rake surface and a relief surface. The peripheral side surface has first and second pairs of opposing side surfaces which include the four relief surfaces and the four rake surfaces, respectively. In an end view, four cutting points on the four major cutting edges define the transitions between the first and second pairs of opposing side surfaces, and a minimum first length dimension between the second pair of opposing side surfaces is less than six-tenths of a minimum second length dimension between two of the four cutting points.
摘要:
A coated tool with a hard coating layer, which has an excellent hardness and heat insulating effect; and exhibits an excellent chipping resistance and an excellent fracturing resistance for a long-term usage, is provided. The hard coating layer included in the coated tool has a chemically vapor deposited alternate laminated structure, which is made of: a region A layer and a region B layer, each of which is expressed by the composition formula of (Ti1-xAlx)(CyN1-y); and has the average total layer thickness of 1-10 μm. In the region A layer, relationships, 0.70≦x≦0.80 and 0.0005≦y≦0.005, are satisfied; the average grain width W is 0.1 μm or less; and the average grain length L is 0.1 μm or less. In the region B layer, relationships, 0.85≦x≦0.95 and 0.0005≦y≦0.005, are satisfied; the average grain width W is 0.1-2.0 μm; and the average grain length L is 0.5-5.0 μm.
摘要:
In a cutting tool having an indexable cutting insert with exactly four cutting portions, the cutting insert is removably securable to an insert holder by a fastener. The cutting insert has two opposing end surfaces with a peripheral side surface extending therebetween, and each cutting portion has a major cutting edge formed by the intersection of a rake surface and a relief surface. The peripheral side surface has first and second pairs of opposing side surfaces which include the four relief surfaces and the four rake surfaces, respectively. In an end view, four cutting points on the four major cutting edges define the transitions between the first and second pairs of opposing side surfaces, and a minimum first length dimension between the second pair of opposing side surfaces is less than six-tenths of a minimum second length dimension between two of the four cutting points.
摘要:
A coated tool with a hard coating layer, which has an excellent hardness and heat insulating effect; and exhibits an excellent chipping resistance and an excellent fracturing resistance for a long-term usage, is provided. The hard coating layer included in the coated tool has a chemically vapor deposited alternate laminated structure, which is made of: a region A layer and a region B layer, each of which is expressed by the composition formula of (Ti1-xAlx)(CYN1-y); and has the average total layer thickness of 1-10 μm. In the region A layer, relationships, 0.70≦x≦0.80 and 0.0005≦y≦0.005, are satisfied; the average grain width W is 0.1 μm or less; and the average grain length L is 0.1 μm or less. In the region B layer, relationships, 0.85≦x≦0.95 and 0.0005≦y≦0.005, are satisfied; the average grain width W is 0.1-2.0 μm; and the average grain length L is 0.5-5.0 μm.
摘要:
A cutting insert for a drill of the present invention comprises an upper face having a first side and a second side respectively disposed on both sides of a first corner portion, a bottom face corresponding to the upper face, and a side face located between the upper face and the bottom face. The insert has a first cutting edge formed along the first side, and a second cutting edge formed along the second side. The side face has a first region corresponding to the first cutting edge, a second region corresponding to the second cutting edge, and a third region corresponding to the first corner portion. The third region has an upper region which is adjacent to the first corner portion and disposed toward the upper face, and a lower region located below the upper region. An inclination angle θ3 of the lower region to the bottom face is larger than each of an inclination angle θ1 of the first region to the bottom face and an inclination angle θ2 of the second region to the bottom face. A drill comprising the insert, and a method of cutting using the same are provided.
摘要:
A cutting tool for cutting a rotationally symmetrical surface of a rotating workpiece includes the step of feeding the cutting tool in a direction inclined with respect to a rotational axis of the rotationally symmetrical surface, while holding the cutting tool in contact with the rotationally symmetrical surface. In the step of feeding the cutting tool, the cutting tool has a point that is in contact with the rotationally symmetrical surface and the point shifts as the cutting tool is fed. The cutting tool includes: a rake face; a flank face; and a cutting edge connecting the rake face and the flank face. The cutting edge as seen from above the flank face has a shape including at least one arc, and the arc has a radius of curvature of not less than 100 mm and not more than 500 mm.
摘要:
A holder and a cutting tool with the holder including an insertion hole at a front end part thereof, and a cutting insert that includes a cutting edge part and a shank part. The shank part has substantially a rod shape. A part of the shank part is immovably located in the insertion hole. The front end part of the holder includes a first curved surface part that becomes wider from a front end toward a back side when viewed from a side thereof. The first curved surface part includes: a curved line that extends from an edge of an opening of the insertion hole toward the back side; or a straight line that extends from the edge of the opening of the insertion hole and connects to a curved line that extends continuously from the straight line toward the back side without an angular part.