Abstract:
A drill reamer (20) comprises an elongate body (21) disposed about a longitudinal axis. The elongate body comprises flutes (22a-22d) having separate hard cutting sections (27a, 28'a, 28"a, 28'b, 28"b) and a soft cutting section (24a, 24b). The soft cutting section is formed of a materia! such as carbide having a hardness that is less than that of the hard cutting sections, which may be formed of pofycrystalline diamond. At least one first hard cutting section (27)a is axially displaced relative to at least one second hard cutting section (28'a, 28"a). The reamer has a tip cutting edge (23a, 23c) and tapered cutting edge portions (24a-24d) disposed at an acute angle relative to the longitudinal axis.
Abstract:
Disclosed is an insert for a cutting tool, in which the top and flank thereof have different com¬ positions. The lifetime of the insert for a cutting tool is increased thanks to the different compositions for the top and flank thereof. Depending on the end use of a cutting tool, the top of the insert for a cutting tool is controlled to have a composition that realizes high or low hardness, or the amount of binder metal is controlled, thereby preventing breakage, top wear, and fusion at the time of cutting. The flank of the insert is formed such that it has a composition able to maintain appropriate hardness, thereby preventing boundary chipping, consequently increasing the lifetime of the insert. The flank of the insert has a lighter color than the top thereof, thereby facilitating determination of the extent of wear of the insert.
Abstract:
Le canon de guidage (1) pour machine-outil, notamment pour tour automatique, comporte au moins deux segments (2), chaque segment étant relié de part et d'autre ô un segment voisin par un moyen élastique (3) pour former un corps de révolution d'axe (1A) et présente une ouverture centrale (10) permettant le passage d'une barre ô usiner, chacun des moyens élastiques (3) s'étend axialement selon l'axe (1A) dans une rainure (8) du canon de guidage.
Abstract:
A method and machine for repairing overhead cam engine cylinder heads and the like. The method includes the steps of removing the caps from the bases of the bearing towers or housings, removing material from the legs of the caps to reduce their height, replacing the caps on the bases, and boring the resulting bearings to produce bearings of the proper diameter. The machine includes a device for machining a bearing cap and a device for boring the bearings. The device for boring the bearings has a boring bar that is supported only at opposite ends of the cylinder head. The bar does not sag or chatter because it is made of an extremely hard and dense material such as a dense tungsten alloy or a ceramic-coated metal.