This application relates to a method of manufacturing a knife using a multilayer material. In one aspect, the method includes preparing a multilayer material for manufacturing a knife, and heating and then forging the multilayer material to form a knife-shaped structure including a blade part and a handle part. The method also includes grinding the blade part to form a sharpened knife-edge and applying mud, including kaolin and white clay, to an entire surface of the knife-shaped structure and removing the mud applied to the blade part. The method further includes heating the knife-shaped structure applied with the mud, and quenching the heated knife-shaped structure through oil-cooling. The method further includes etching a surface of the quenched knife-shaped structure to form a pattern on the surface and grinding the surface-etched knife-shaped structure to form a knife having a final shape.

An integrated multiple razor blade capable of effectively reducing skin damage caused by the blade, and a manufacturing method thereof are provided. The integrated multiple razor blade may include a frame portion and a razor blade portion. The frame portion has a predetermined length, and comprises a plurality of sections that are separated at a predetermined interval along one direction. The razor blade portion is formed integrally with the frame portion, and has a plurality of razor blades formed perpendicularly to the frame portion.

The present disclosure relates to safety blades for use in utility knives, related assemblies and methods of manufacturing. More specifically, the present disclosure relates to safety blades for use in utility knives, related assemblies and methods of manufacture which limit user exposure to associated cutting edges.

The present disclosure relates to safety blades for use in utility knives, related assemblies and methods of manufacturing. More specifically, the present disclosure relates to safety blades for use in utility knives, related assemblies and methods of manufacture which limit user exposure to associated cutting edges.

An exemplary hand-held, power operated rotary knife dermatome comprises a blade housing assembly and a depth gauge assembly. The blade housing assembly includes an annular blade housing and a blade lock ring for rotatably supporting an annular rotary knife blade. The annular blade housing includes a shield extending radially inwardly from a blade receiving body and including an inner wall defining a tissue directing surface, the tissue directing surface including a first tissue guide surface extending upwardly from a lower end of the shield, the first tissue guide surface extending substantially parallel to the blade housing axially extending center line. The blade receiving body includes an annular blade channel extending axially upwardly from a lower surface of the blade receiving body, a bearing surface axially spaced from a lower surface of the blade receiving body, and a threaded portion formed on the outer surface of the annular blade housing.

A cutter bar has a cutter body with a substantially rectangular cross section formed by an upper face, two side faces and a lower face. The upper face together with at least one side face defines a cutting edge, which is formed by one or more hard metal profile strips fastened in a groove in the cutter body. The wall of the groove which adjoins the upper face of the cutter body encloses with the upper face of the cutter body an angle less than 90, preferably 89 to 15, particularly preferably 80 to 40. The wall of the groove which adjoins the lateral face of the cutter body encloses with the lateral face of the cutter body an angle less than 90, preferably 89 to 15, particularly preferably 80 to 40. The hard metal profile strip or hard metal profile strips is or are positively inserted in the groove.

A stamping tool formed from a steel strip and method of forming the stamping tool. The stamping tool is formed from a steel strip shaped on a narrow side with a cutting part having a cutting edge. The stamping tool includes a back part with a contour in cross section on a narrow side of the steel strip, recesses shaped in the back part with free spreading of the material to be transverse to a longitudinal extension of the steel strip and perpendicular to lateral surfaces of the steel strip, such that an extent of the spreading is smaller than a thickness of the steel strip, and undeformed regions located between the recesses.

A cutter bar has a cutter body with a substantially rectangular cross section formed by an upper face, two side faces and a lower face. The upper face together with at least one side face defines a cutting edge, which is formed by one or more hard metal profile strips fastened in a groove in the cutter body. The wall of the groove which adjoins the upper face of the cutter body encloses with the upper face of the cutter body an angle less than 90, preferably 89 to 15, particularly preferably 80 to 40. The wall of the groove which adjoins the lateral face of the cutter body encloses with the lateral face of the cutter body an angle less than 90, preferably 89 to 15, particularly preferably 80 to 40. The hard metal profile strip or hard metal profile strips is or are positively inserted in the groove.

A method of treatment of a cutting piece (2) is provided. This method includes a first step in which a cutting surface (5) of this cutting piece (2) is subjected to shots thrown by an ultrasonic shot peening apparatus (10) to become a cutting surface (5) with shot impacts, and a second step in which the cutting surface (5) with shot impacts is grinded over a chosen thickness to become a treated cutting surface (5).

Equipment for treating a cutting piece is provides which includes an ultrasonic shot peening apparatus arranged for throwing shots on a cutting surface of the cutting piece so the cutting surface defines a cutting surface with shot impacts; and a grinding device arranged for grinding the cutting surface with shot impacts over a chosen thickness so that the cutting surface with the shot impacts defines a treated cutting surface.