Abstract: An end mill includes a major-diameter shank, a cone-shaped connector portion disposed at the end of the shank, a minor-diameter body disposed by way of the connector portion coaxially therewith, a toothed element disposed at the leading end of the body, an installation recess dented slightly in the toothed element, and a cutting edge held in the installation recess so as to swell in the shape of an arc to protrude from an outer peripheral face of the body.

Abstract: A processing method for a surface of a workpiece using a rotating cutting tool, includes a processing method for forming a cut pattern by rotationally cutting a surface of a workpiece using a rotating cutting tool having cutting edges extending in a rotation axis direction at a plurality of circumferentially separated positions on an outer circumference of a body thereof. Each of the cutting edges includes a plurality of segmental edges segmented at an equal pitch in the rotation axis direction. A ratio of depth d to width W (d/W) of a knife mark formed on the surface of the workpiece by the segmental edges is not less than 3/100.

Abstract: In a circular saw blade, cutting teeth are joined to tooth bodies projecting outward in a radial direction at locations on an outer periphery of a disk-shaped metal base, gullets are provided between the tooth bodies so as to be recessed in the radial direction, radial clearance angles of side cutting edges of the cutting teeth are greater than ?1° and less than 1°, and a vibration prevention mechanism for preventing vibration of the metal base itself is provided. A ratio of a difference between a maximum value and a minimum value of pitches of the multiple cutting teeth to an average value of the pitches is 40% to 100%. A ratio of a difference between a maximum value and a minimum value of average values of depths of the adjacent gullets to an average value of depths of the gullets may be 20% to 100%.

Abstract: The invention suppresses chipping of a cutting edge of a cutting tool while maintaining sharpness of the cutting edge. [Solution] A coating (20) of a replaceable knife (10) of the cutting tool is formed so that either one of a rake-face coating portion (22) that coats a rake face (14) or a clearance-face coating portion (24) that coats a clearance face (16) becomes thicker than the other. The film thickness of the thicker coating portion (22, 24) is set in a range of 0.5 ?m to 15.0 ?m, and a ratio of the film thickness of the thinner coating portion (24, 22) to the film thickness of the thicker coating portion (22, 24) is set in a range of 0.01 to 0.15.

Abstract: A processing method for a surface of a workpiece using a rotating cutting tool, includes a processing method for forming a cut pattern by rotationally cutting a surface of a workpiece using a rotating cutting tool having cutting edges extending in a rotation axis direction at a plurality of circumferentially separated positions on an outer circumference of a body thereof Each of the cutting edges includes a plurality of segmental edges segmented at an equal pitch in the rotation axis direction. A ratio of depth d to width W (d/W) of a knife mark formed on the surface of the workpiece by the segmental edges is not less than 3/100.

Abstract: A spare blade 25 is a square plate formed of cemented carbide and to be attached to an outer circumferential surface of a cutter 10 for forming a plane. A flat face 28 forming cutting edges is a convex portion 28a slightly bulging in a shape of a lateral surface of a single cone, and a center of the square plate lies on an axis of the convex portion 28a. An entire surface of the spare blade 25 is covered with a diamond coating film having a thickness of 5 to 25 ?m.

Abstract: A method for manufacturing a tipped circular saw blade includes forming a disk-shaped metal base producing cutting edge tips by grinding cutting edges, coating the cutting edge tips with hard coating film, fixing the cutting edge tips coated with the hard coating film to teeth of the metal base by brazing. The hard coating film is of one material selected from a first material including one of nitrides, oxides or oxynitrides containing at least one of Al, Ti, and Cr, a second material including the first material containing at least one of Si, V, Ni, Y, Zr, Nb, Mo, Ta and W, a third material including the first material including at least one of B and C, and a fourth material including the second material containing at least one of B and C.

Abstract: [OBJECT] To make tips less likely to be damaged. [MEANS OF REALIZING THE OBJECT] A tip (30) has a first rake face (40) that is contiguous with a cutting edge (32), and a second rake face (42) that is contiguous with the first rake face and faces a gullet (16) provided in front of the tip (30) in the rotational direction, wherein the second rake face (42) has a radially inward inner edge that is in contact with the outer peripheral edge of the base metal (12) that defines the gullet (16). The second rake face (42) is formed such that the second rake angle (02), which is formed between a first reference line (L1) drawn from the rotation center of the circular saw blade to the cutting edge (32) and a second reference line (L2) that passes through the radially inward inner edge along the second rake face (42), is a negative angle.

Abstract: A wood or resin cutting tool with improved durability is provided. The wood or resin cutting tool is composed of a base material made of steel or a cemented carbide alloy, and a coating formed on at least one of the rake face and the clearance face of the cutting tool. The coating includes a periodic structure layer made of chromium oxynitride, in which high oxygen regions having a high concentration of oxygen in the texture and low oxygen regions having a lower concentration of oxygen in the texture than the high oxygen regions periodically exist in the thickness direction of the coating. The periodic structure layer is formed such that the nitrogen concentration periodically turns high and low in the thickness direction of the layer corresponding to the high oxygen regions and the low oxygen regions.

Abstract: A tipped saw blade is comprised of a base metal and a plurality of tips of varying length that are arranged on an outer circumferential periphery of the base metal. The plurality of tips include long tips with a setting line length in a radial direction of 4 mm or more, and short tips with a setting line length in the radial direction of less than 4 mm. The number of long tips may be between 2% to 15% of the total number of long tips and short tips combined, where the number of long tips is two or more.

Abstract: Provided is a wood cutting tool with improved wear resistance and corrosion resistance. A hard fundamental layer (18) of chromium nitride (CrN) is subjected to PVD to be coated on a rake face (16) of a substrate (12) formed of a cemented carbide alloy or a tool steel. The hard fundamental layer (18) has a five-layer structure having a first layer (18a) to a fifth layer (18e) disposed in order from the substrate (12) side. A hard main layer (20) of chromium oxide (Cr2O3) is coated on the outer surface of the fifth layer (18e) of the hard fundamental layer (18). The hard main layer (20), like the hard fundamental layer (18), is formed by PVD. The hard fundamental layer (18) is coated with the hard main layer (20) to suppress corrosion, thereby improving the wear resistance and corrosion resistance of a cemented carbide replaceable knife (10).

Abstract: A disc-shaped tool includes a plurality of virtual regions formed such that it is surrounded by two radius lines extending from a rotation center of a disc-shaped base metal and two concentric circles on the base metal disposed around the rotation center. A central angle formed by the two radius lines is equal to or less than 90°, and the number of the virtual regions is 4 to 24. The concentric circle located in a center of an interval of the two concentric circles forming the virtual region is in a range of 0.6 r to 0.8 r with respect to the rotation center of the base metal when a maximum gullet bottom radius of the base metal is r. An overlapping of the virtual regions continuously adjoining each other is in a range of 0° to 12°. A minimum neighborhood distance between the adjoining slits is equal to or more than 0.05 r. A ratio of a length of an arc of the central concentric circle in each virtual region with respect to the interval of the two concentric circles in the virtual region is 3 to 6.

Abstract: A flat cutting tool includes a blade member fixed to a mounting concavity of a base member using a brazing filler metal or an adhesive agent to form a cutting edge on a surface layer side of the blade member. The blade member includes a surface layer which is a high-speed tool steel with a high degree of hardness, a middle layer which is an alloy steel having a lower quench-hardenability than the high-speed tool steel, and a lower layer which is a mild steel having little quench-hardenability, which can be formed by forge welding. The blade member can be quenched and tempered, and the surface layer hardened to a hardness suitable for the cutting tool and fixed to the mounting concavity of the base member.

Abstract: Cutting portion regions of replaceable blades that extrude outward in a radial direction at a plurality of portions in a peripheral direction of an outer periphery of a body of a finger joint cutter are arranged in that, as for a cutting portion material that comprises cutting edge, tip end cutting portions are formed of a steel material of high hardness and base portion side cutting portions, which are the remaining portions, are formed of a steel material that exhibits a higher toughness than that of the tip end cutting portions. It is possible to improve the wear resistance through the tip end cutting portions and to improve the chipping resistance by the base portion side cutting portions. The steel material of high hardness comprising the tip end cutting portions and the steel material of high toughness comprising the base portion side cutting portions are successively joined through forge welding.

Abstract: A tipped saw blade 10 is comprised of a disc-like base metal 11 and tooth bodies 12 projecting outward in a diametrical direction from plural positions continuously spaced at equal intervals on an outer periphery of the base metal 11. The first tips C1 and the second tips C2 are disposed and fixed on a front face in a rotational direction of each of plural tooth bodies 12 in such a way that two first tips C1 and a second tip C2 repeatedly appear in this order. The first tip C1 has a Kerf cutting dimension S1 at a position at which a maximum width W1 is reached, and its rotational radius at the position at which the maximum width W1 is reached is R1. The second tip C2 has a Kerf cutting dimension S2 at a position at which a maximum width W2 is reached, and its rotational radius, at the position at which the maximum width W2 is reached, is R1. The Kerf cutting dimension S2 is shorter than the Kerf cutting dimension by 0.01 to 0.05 mm.

Abstract: A bonded layer protection structure of a wear resistant component, comprising a wear resistant component such as a cutting tool constructed by bonding a wear resistant member such as a cutting portion to a main body portion such as a base metal by an adhesive. In this case, a necessary part of an adhesive layer exposed portion in a bonded portion between the wear resistant member and the main body portion is covered with a filler or a covering material. In addition, in the wear resistant component such as the cutting tool, a necessary part of the adhesive layer exposed portion in the bonded portion between the wear resistant member and the main body portion is covered with a sticking member.

Abstract: A side cutting edge of a tip 20 fixed to the outer circumference of a circular saw blade body 11 has a inflexion point K at a portion at which the tip projects laterally to the greatest distance. An outer-circumferential-side portion of the side cutting edge has a negative radial clearance angle of not less than −1° but less than 0° at the inflexion point, and an inner-circumferential-side portion of the side cutting edge has a positive radial clearance angle of greater than 0° but less than −1° at the inflexion point. By virtue of this configuration, a cut surface having a better surface roughness as compared to that obtained conventionally can be obtained in cutting of a soft material such as wood by use of a circular saw.

Abstract: A milling cutter for slotting which is provided with a blade body structure capable of producing, without sacrificing strength, an excellent quality of durable film by physical deposition method also on the side flank of a projected cutting blade near the bottom or the outside flank of a bottom edge and comprises blade bodies (22) with a plurality of projected cutting blades (24) disposed in comb shape which are installed on a cutter body (20) at specified pitches in the circumferential direction and a bottom edge (32) formed on the same surface as the cutting face (28) of the projected cutting blade at the bottom between the projected cutting blade and its adjacent projected cutting blade, characterized in that a bottom groove (38) having a with of 90 to 100% of the width of the bottom edge (32) is formed so that the bottom edge is cut off and then the blade bodies are coated with hard film and also a bottom groove having a width of 70 to 100% of the width of the bottom edge is formed at an attack angle of 0

Abstract: A bonded layer protection structure of a wear resistant component, comprising a wear resistant component such as a cutting tool constructed by bonding a wear resistant member such as a cutting portion to a main body portion such as a base metal by an adhesive. In this case, a necessary part of an adhesive layer exposed portion in a bonded portion between the wear resistant member and the main body portion is covered with a filler or a covering material. In addition, in the wear resistant component such as the cutting tool, a necessary part of the adhesive layer exposed portion in the bonded portion between the wear resistant member and the main body portion is covered with a sticking member.

Abstract: A milling cutter for slotting which is provided with a blade body structure capable of producing, without sacrificing strength, an excellent quality of durable film by physical deposition method also on the side flank of a projected cutting blade near the bottom or the outside flank of a bottom edge and comprises blade bodies (22) with a plurality of projected cutting blades (24) disposed in comb shape which are installed on a cutter body (20) at specified pitches in the circumferential direction and a bottom edge (32) formed on the same surface as the cutting face (28) of the projected cutting blade at the bottom between the projected cutting blade and its adjacent projected cutting blade, characterized in that a bottom groove (38) having a with of 90 to 100% of the width of the bottom edge (32) is formed so that the bottom edge is cut off and then the blade bodies are coated with hard film and also a bottom groove having a width of 70 to 100% of the width of the bottom edge is formed at an attack angle of 0