A method produces wafers from a cylindrical ingot of semiconductor material having an axis and an indexing notch in an outer surface of the cylindrical ingot and parallel to the axis. The method includes, in the order specified: (a) simultaneous removal of a multiplicity of sliced wafers from the cylindrical ingot by multi-wire slicing in the presence of a cutting agent; (b) etching of the sliced wafers with an alkaline etchant in an etching bath at a temperature of 20? C. to 50? C. and for a residence time, such that the material removed from each of the sliced wafers is less than 5/1000 of an initial wafer thickness; and (c) grinding of the etched wafers by simultaneous double-disk grinding using an annular abrasive covering.

A diamond wire saw includes a steel wire, a molded sleeve, and a plurality of diamond bead bearing units. The molded sleeve surrounds and is bonded to the steel wire. The diamond bead bearing units are disposed around and bonded to the molded sleeve. Each of the diamond bead bearing units includes a tubular body and a functional layer that covers the tubular body and that contains a plurality of abrasive diamond particles. The molded sleeve is made of polyether-type thermoplastic polyurethane, and has a Shore hardness of greater than or equal to 70 D.

This process for manufacturing a closed loop of cutting wire comprises manufacturing a cutting wire comprising a central core extending continuously between two free ends. The central core having a tensile strength higher than 1400 MPa. The process includes welding the two free ends together to form the closed loop of cutting wire, in which: the manufacture of the cutting wire comprises making the central core from a material that is solid-state weldable. The welding is a solid-state welding operation comprising crushing, at a temperature below the melting point of the material of the central core, one of the free ends against the other of its free ends until the two ends have interpenetrated and formed a single uniform body of material.

What is disclosed is a blade core for attachment with an endless chain assembly. The blade core is a generally circular disc having two opposing faces and a width between the faces. The blade core has a circumferential groove extending inward from the circumference of the blade core such that the drive links, or the tang of the drive links, extends from the chain located on the circumference of the circular disc inward in said groove. Ideally the width of the groove is proximate to the width of the drive link such that friction between the sides of the groove and the drive link prevent the chain from rotating along the circumference of the circular disc when the blade core and endless chain assembly are rotating to cut a material. Ideally the base of tie-strap-tie strap and tie strap-cutter assembly is the same as width of the rail to restrict lateral movement.

The present disclosure pertains generally to cutting belts, in particular cutting belts having a cable. In certain aspects, this disclosure provides new cutting segments and cable arrangements for cutting belts. In some embodiments, the cutting belt has cable arrangements that resist rotation when under tension. Cutting belts having cable segments positioned radially outward of other cable segments, relative to the central opening of the cutting belt, around at least 60% of the length of the cutting belt, and cutting belts having cable segments with different twist directions are disclosed.

This process for manufacturing a closed loop of cutting wire comprises manufacturing a cutting wire comprising a central core extending continuously between two free ends. The central core having a tensile strength higher than 1400 MPa. The process includes welding the two free ends together to form the closed loop of cutting wire, in which: the manufacture of the cutting wire comprises making the central core from a material that is solid-state weldable. The welding is a solid-state welding operation comprising crushing, at a temperature below the melting point of the material of the central core, one of the free ends against the other of its free ends until the two ends have interpenetrated and formed a single uniform body of material.

Embodiments herein provide a high stability saw chain comprising a first drive link including a first mating surface; a second drive link including a second mating surface; a first tie strap coupling the first drive link to the second drive link; wherein the first mating surface of the first drive link is configured to contact the second mating surface of the second drive link when the first and second drive links traverse an elongate portion of a guide bar to prevent reverse articulation of the saw chain less than a minimum radius of 20 inches.

A cutting bead (13) for a saw rope (15) comprises a geometrically defined cutting portion (2) and tapers from the geometrically defined cutting portion (2) contrary to a sawing direction. With such cutting beads (13), a saw rope (15) is formed. In a method for manufacturing a saw rope (15), a cutting element (1) with a geometrically defined cutting portion (2) and an abrasive element (6) with a geometrically undefined cutting portion (14) or a neutral element (8) are joined. With the cutting element (1) and the abrasive element (6) or the neutral element (8), a cutting bead (13) is formed. The cutting bead (13) is joined onto the support rope (16).

A saw chain includes connecting links and drive links that are mutually connected by rivets in an articulated manner about rivet axes. The rivets project through at least one rivet opening of one connecting link and through a rivet opening of a drive link. At least one rivet has, on one end face thereof, a depression having a depression edge and a depression base surrounded by the depression edge. The distance of the depression edge from a central plane of the saw chain increases at an increasing radial distance from the rivet axis. The distance (e) of the base from the central plane does not increase at any point of the base at an increasing radial distance from the rivet axis. A greatest distance (a) of the base from the rivet axis corresponds to 50% to 100% of half the core diameter (d) of the rivet.

A method to make sawing beads by means of laser cladding is disclosed whereby metal matrix powder is molten by means of a laser beam on a rotating sleeve while diamonds are thrown in the molten metal pool. By carefully controlling the temperature of the molten metal pool at or above 1150 C. for less than 200 ms the internal graphitization of the diamonds can be limited. Although some of the diamonds in the sawing bead show internal graphitization it is demonstrated by the inventors that a sawing cord using the bead obtained by the method has an above standard sawing performance.