A sawblade for a circular saw, including a round, disk-shaped core blade made from one or more parts, with a plurality of circumferentially distributed saw teeth being arranged at its external perimeter and with its center comprising a connection for fastening the sawblade at a driveshaft, and at least one side area of the core blade including open channels 7 for guiding liquids. A circular sawing machine having such a sawblade and a method for producing such a sawblade are also provided.

In a sawing cord the three constituting elements of steel cord, sawing bead and sleeve polymer in between the beads must work optimally together. In order to improve the injection molding quality the inventors disclose an injection mold wherein the injection channels inject polymer from opposite sides of the steel cord into the injection cavity. The injection mold comprises two half molds that form the injection cavity when closed. Different preferred embodiments are described inclusive the use of channels having a tree structure, preferably a binary channel tree, preferably a balanced binary tree and most preferred a balanced binary tree with equal length pathways from feed channel to each injection channel. The use of heated channels is disclosed and the rules for balancing between the number of heated versus non-heated channels are explained. Furthermore the method to use such mold and the product resulting from the use of the mold are claimed.

In a sawing cord the three constituting elements of steel cord, sawing bead and sleeve polymer in between the beads must work optimally together. In order to improve the injection molding quality the inventors disclose an injection mold wherein the injection channels inject polymer from opposite sides of the steel cord into the injection cavity. The injection mold comprises two half molds that form the injection cavity when closed. Different preferred embodiments are described inclusive the use of channels having a tree structure, preferably a binary channel tree, preferably a balanced binary tree and most preferred a balanced binary tree with equal length pathways from feed channel to each injection channel. The use of heated channels is disclosed and the rules for balancing between the number of heated versus non-heated channels are explained. Furthermore the method to use such mold and the product resulting from the use of the mold are claimed.

A method for manufacturing a continuous drill ring for a core drill bit is disclosed. The method includes forming at least two green compacts in layers in a direction of formation between a bottom side and a top side by successively applying powder layers containing a powder mixture and diamond layers containing diamond particles that are arranged in a set pattern. The green compacts are shaped into ring segments under the effect of pressure. The ring segments are joined in a circular manner and they are sintered under the effect of heat so as to obtain a continuous drill ring.

A manufacturing apparatus of a ring-shaped band saw blade for manufacturing the ring-shaped band saw blade including a tooth tip to which a hard cutting tip is joined. The manufacturing apparatus includes a rotatory moving section that provides rotatory movement of the ring-shaped band saw blade including a body part having a band shape and a tooth part including a plurality of teeth formed on one side part of the body part; a surface polishing section that polishes an inner surface and an outer surface of the body part in the ring-shaped band saw blade in the rotatory movement provided by the rotatory moving section; and an end face polishing section that polishes an end face of the body part on a side opposite to the tooth part in the ring-shaped band saw blade in the rotatory movement provided by the rotatory moving section.

A manufacturing apparatus of a ring-shaped band saw blade for manufacturing the ring-shaped band saw blade including a tooth tip to which a hard cutting tip is joined. The manufacturing apparatus includes a rotatory moving section that provides rotatory movement of the ring-shaped band saw blade including a body part having a band shape and a tooth part including a plurality of teeth formed on one side part of the body part; a surface polishing section that polishes an inner surface and an outer surface of the body part in the ring-shaped band saw blade in the rotatory movement provided by the rotatory moving section; and an end face polishing section that polishes an end face of the body part on a side opposite to the tooth part in the ring-shaped band saw blade in the rotatory movement provided by the rotatory moving section.

Metal sleeves are used as carriers for the abrasive layer of sawing beads. Such sawing beads are threaded on a steel cord and are separated by a polymer thus forming a sawing cord for sawing of hard and brittle materials such as stone or concrete. These metal sleeves have a large influence on the overall performance as well as on the cost of the sawing cord. The inventors propose the method of metal injection molding to make the metal sleeves in large quantities with an optimized geometry which is not possible with the current methods for making the metal sleeves. Over and above the inventive sleeves are particularly well suited for application of the abrasive layer by means of laser cladding. Beads made by laser cladding on the inventive metal sleeves as well as sawing cords comprising such beads are therefore part of the invention.

Metal sleeves are used as carriers for the abrasive layer of sawing beads. Such sawing beads are threaded on a steel cord and are separated by a polymer thus forming a sawing cord for sawing of hard and brittle materials such as stone or concrete. These metal sleeves have a large influence on the overall performance as well as on the cost of the sawing cord. The inventors propose the method of metal injection molding to make the metal sleeves in large quantities with an optimized geometry which is not possible with the current methods for making the metal sleeves. Over and above the inventive sleeves are particularly well suited for application of the abrasive layer by means of laser cladding. Beads made by laser cladding on the inventive metal sleeves as well as sawing cords comprising such beads are therefore part of the invention.

There is provided a base-integrated blade manufacturing method for manufacturing a base-integrated blade by fixing a cutting blade having a circular opening to a base having an annular projection. The method includes a first step of preparing the base having the projection that has an outside diameter greater than a diameter of the opening of the cutting blade, and the cutting blade, a second step of lowering a temperature of the base and thus shrinking the base to have the outside diameter of the projection smaller than the diameter of the opening of the cutting blade, a third step of inserting the projection into the opening of the cutting blade, and a fourth step of raising the temperature of the base and thus expanding the base in such a manner that the cutting blade is fixed to the base.

A method for producing a machining segment for a machining tool, where the machining segment is connectable to a basic body of the machining tool by an underside of the machining segment, includes producing a green body by placing first hard material particles in depressions of a first press punch and applying a first matrix material to the first hard material particles. The green body is processed by hot pressing under temperature and pressure between the first press punch, which forms an upper side of the machining segment, and a second press punch, which forms the underside, to form the machining segment, where the upper side is opposite from the underside.