An earth-boring tool having at least one cutting element with a multi-friction cutting face provides for the steering of formation cuttings as the cuttings slide across the cutting face. The multi-friction cutting element includes a diamond table bonded to a substrate of superabrasive material. The diamond table has a cutting face formed thereon with a cutting edge extending along a periphery of the cutting face. The cutting face has a first area having an average surface finish roughness less than an average surface finish roughness of a second area of the cutting face, the two areas separated by a boundary having a proximal end proximate a tool crown and a distal end remote from the tool crown.

This surface-coated cutting tool includes a cutting tool body made of tungsten carbide-based cemented carbide and a hard coating layer deposited on a surface of the cutting tool body, in which the hard coating layer has at least one (Ti.sub.1-xAl.sub.x)N layer (0.4≦X≦0.7, X is an atomic ratio) with an average layer thickness of 0.5 to 10 μm, the (Ti, Al)N layer has a cubic crystal structure, and Ia−Ib<5 is satisfied when Ia (%) is an average absorptance of the hard coating layer at a wavelength of 400 to 500 nm and Ib (%) is an average absorptance of the hard coating layer at a wavelength of 600 to 700 nm.

Disclosed are a drill bit for drilling and a method for manufacturing same, in which the hardness of a body part of a shank can be selectively improved by performing rapid cooling in a forced cooling method after performing rapid heating selectively only on the body part of the shank in a high-frequency induction heating method after completing infiltration.

A hob for a cutting apparatus including a hollow body of a sintered hard metal composition and a cavity located within the body, the cavity having a volume in the range of about 10% to about 90% of the volume of the body.

A hob for a cutting apparatus including a hollow body of a sintered hard metal composition and a cavity located within the body, the cavity having a volume in the range of about 10% to about 90% of the volume of the body.

A method for reloading a single-flute drill comprising a shaft made of a hard metal and a drill head that is connected to the shaft and is made of a hard metal, is characterized by the following steps: removing a worn drill head from the shaft; integrally bonding a new drill head to the shaft.

A method for reloading a single-flute drill comprising a shaft made of a hard metal and a drill head that is connected to the shaft and is made of a hard metal, is characterized by the following steps: removing a worn drill head from the shaft; integrally bonding a new drill head to the shaft.

A method for producing woodworking spade bits includes producing shanks from cylindrical rods. Each shank includes a front connecting portion including a front welding face extending between two front inclined sides and having a first width. Bits are produced from a flat board. Each bit includes a front end having a drilling portion with a second width larger than the first width. Each bit further includes a rear end having a rear connecting portion. The rear connecting portion includes two rear inclined sides extending rearwards towards a longitudinal axis. The rear connecting portion further includes a rear welding face extending between the rear inclined sides and having a width equal to the first width. The front welding face of each shank and the rear welding face of each bit are welded together, forming semi-products of woodworking spade bits which are heat processed, surface treated, and grinded to obtain final products.

A method for producing woodworking spade bits includes producing shanks from cylindrical rods. Each shank includes a front connecting portion including a front welding face extending between two front inclined sides and having a first width. Bits are produced from a flat board. Each bit includes a front end having a drilling portion with a second width larger than the first width. Each bit further includes a rear end having a rear connecting portion. The rear connecting portion includes two rear inclined sides extending rearwards towards a longitudinal axis. The rear connecting portion further includes a rear welding face extending between the rear inclined sides and having a width equal to the first width. The front welding face of each shank and the rear welding face of each bit are welded together, forming semi-products of woodworking spade bits which are heat processed, surface treated, and grinded to obtain final products.

A method for manufacturing a cutting tool having a rake face, a flank face, and an edge having a ridge line interconnecting the rake face and the flank face, wherein on the flank face there is a cutting edge region from the ridge line of the edge to a point A away therefrom on the side of the flank face by a distance X, the method comprising producing and processing the flank face with a laser, the producing and processing being producing and processing the cutting edge region along the ridge line of the edge with a first laser beam having a depth of focus equal to or deeper than a width of the cutting edge region when the distance X is the width of the cutting edge region, the distance X being 0.2 mm or more and 5 mm or less.