The invention relates to a ring-shaped tool for processing a workpiece, wherein the tool has a fastening region which is centred with its ring shape for fastening to a rotatable drive shaft, wherein the tool has cutting teeth and the teeth extend on both sides of the tool in each case from the head region of the tool in the direction of the fastening region, the teeth on one side having a right-hand twist and providing right-hand cutting, and the teeth on the other side having a right-hand twist and providing left-hand cutting.

The invention relates to a ring-shaped tool for processing a workpiece, wherein the tool has a fastening region which is centred with its ring shape for fastening to a rotatable drive shaft, wherein the tool has cutting teeth and the teeth extend on both sides of the tool in each case from the head region of the tool in the direction of the fastening region, the teeth on one side having a right-hand twist and providing right-hand cutting, and the teeth on the other side having a right-hand twist and providing left-hand cutting.

Railway wheel milling tool system including a railway wheel truing cutters and tangential railway wheel milling inserts are disclosed. The tangential milling inserts have at least four indexable cutting edges, each with a central wiper cutting edge segment between two convex cutting edge segments. The milling inserts may allow both the flat portion and curved portion of a railway wheel to be machined with an improved surface finish. The railway wheel truing cutters comprise a plurality of insert pockets structured and arranged to receive the tangential railway wheel milling inserts.

Railway wheel milling tool system including a railway wheel truing cutters and tangential railway wheel milling inserts are disclosed. The tangential milling inserts have at least four indexable cutting edges, each with a central wiper cutting edge segment between two convex cutting edge segments. The milling inserts may allow both the flat portion and curved portion of a railway wheel to be machined with an improved surface finish. The railway wheel truing cutters comprise a plurality of insert pockets structured and arranged to receive the tangential railway wheel milling inserts.

A rotary cutting tool for slotting and a cutting insert replaceably mounted to such a rotary cutting tool. The cutting insert is mounted to an insert pocket of a tool body of the rotary cutting tool and is pressed by an elastic pressure portion provided in the tool body. The cutting insert has an upper surface, a lower surface and four peripheral side surfaces. The top and lower surfaces have an inclined surface pressed by the elastic pressure portion. When the cutting insert is mounted to the insert pocket, the inclined surface of the upper surface is pressed by the elastic pressure portion. The inclined surface is inclined with respect to a cross section of the cutting insert such that the lower surface and two peripheral side surfaces of the cutting insert are contacted with the insert pocket by pressure of the elastic pressure portion.

A rotary cutting tool for slotting and a cutting insert replaceably mounted to such a rotary cutting tool. The cutting insert is mounted to an insert pocket of a tool body of the rotary cutting tool and is pressed by an elastic pressure portion provided in the tool body. The cutting insert has an upper surface, a lower surface and four peripheral side surfaces. The top and lower surfaces have an inclined surface pressed by the elastic pressure portion. When the cutting insert is mounted to the insert pocket, the inclined surface of the upper surface is pressed by the elastic pressure portion. The inclined surface is inclined with respect to a cross section of the cutting insert such that the lower surface and two peripheral side surfaces of the cutting insert are contacted with the insert pocket by pressure of the elastic pressure portion.

A cutting tool with interconnected arms that increases the stiffness to weight ratio of the cutting tool is described. The principles of the invention can be applied to any cutting tool, such as a reamer, a milling cutter, a slotting cutter, and the like. In one example, a cutting ring includes a cutting head assembly with a leading arm, a trailing arm, and a cutting head supported by the leading arm and the trailing arm. The trailing arm interconnects with the leading arm of an adjacent cutting head assembly, and the leading arm interconnects with a trailing arm of another adjacent cutting head assembly. As a result of this interconnection of arms, the axial, radial and tangential stiffness to weight ratio of the cutting tool is increased. A support member may be included to further increase the stiffness to weight ratio.

A cutting insert includes a cutting edge having an involute-curve approximate shape. A cutting edge is formed so as to wholly take on a first curved shape with a first curvature radius when the cutting insert is viewed from the end surface, and is formed so that a large part of the cutting edge takes on a second curved shape with a second curvature radius when the cutting insert is viewed from the side surface.

A cutting insert includes a cutting edge having an involute-curve approximate shape. A cutting edge is formed so as to wholly take on a first curved shape with a first curvature radius when the cutting insert is viewed from the end surface, and is formed so that a large part of the cutting edge takes on a second curved shape with a second curvature radius when the cutting insert is viewed from the side surface.

A double-sided tangential cutting insert comprising a pair of cutting rake faces, a pair of major side surfaces and a pair of opposing minor side faces each having a twisted convex shape. Each of the cutting rake faces is defined between a pair of main cutting edges, a pair of full nose cutting edges, and a pair of opposing convex minor cutting edges. Each of the minor side faces is defined between one of the convex minor cutting edges at one of the rake faces and one of the convex minor cutting edges at the other one of the rake faces wherein, at each minor side face, a ridge line interconnects an apex of the convex minor edge at the one of the rake faces and an apex of the convex minor cutting edge at the other one of the rake faces. Other variants and embodiments are broadly contemplated herein.