Cell combines stone finishing, abrasive tape.Superfinishing of rotating ro·tate v. ro·tat·ed, ro·tat·ing, ro·tates v.intr. 1. To turn around on an axis or center. 2. components, including automotive transmission parts and crankshafts can produce measurable performance benefits in the end product. For automotive applications, that can mean better fuel efficiency and quieter, smoother shifting. Superfinishing hard-turned components also streamlines the manufacturing process and reduces costs. An automated au·to·mate v. au·to·mat·ed, au·to·mat·ing, au·to·mates v.tr. 1. To convert to automatic operation: automate a factory. 2. superfinishing cell built for General Motors Corp incorporates some unique technology that gives GM the ability to superfinish five different transmission components. Designed and manufactured by Supfina Machine Co Inc, Warwick, RI, the five-machine cell combines abrasive abrasive, material used to grind, smooth, cut, or polish another substance. Natural abrasives include sand, pumice, corundum, and ground quartz. Carborundum (silicon carbide) and alumina (aluminum oxide) are important synthetically produced abrasives. stone and tape finishing to allow superfinishing of both cylindrical cyl·in·dri·cal adj. Of, relating to, or having the shape of a cylinder, especially of a circular cylinder. and flat parts. The cell is built around vertical-Supfina SM 814-1 single-station machines designed for plunge The term Plunge has multiple meanings:
Use of dual superfinishing media in one of the machines allows simultaneous finishing of two diameters on some of the parts, while meeting GM specifications for cycle time and process capability. Dimensional and surface finish requirements for one of the components requiring dual-media finishing illustrate process capability: * First diameter: 138 mm |+ or -~ 100||micro~meter~, average stock removal 18 ||micro~meter~, surface finish 1.0 ||micro~meter~ Ra. * 90 mm |+/-~12.5 ||micro~meter~, average stock removal 30 ||micro~meter~, surface finish 0.6 ||micro~meter~ Ra max. Total cycle time for this and the other four parts is 22.5 sec. Process capability (Cp) for superfinishing the 138-mm diameter is 2.68; Cp for finishing the 90-mm diameter is 3.48. Another machine uses a stone that projects downward at a 45-deg angle to superfinish a journal obstructed ob·struct tr.v. ob·struct·ed, ob·struct·ing, ob·structs 1. To block or fill (a passage) with obstacles or an obstacle. See Synonyms at block. 2. by an external spline In computer graphics, a smooth curve that runs through a series of given points. The term is often used to refer to any curve, because long before computers, a spline was a flat, pliable strip of wood or metal that was bent into a desired shape for drawing curves on paper. See Bezier and B-spline. . The part also has four seal ring diameters that are simultaneously superfinished using abrasive tape. Surface finish requirements for the stone finished journal are 0.5 ||micro~meter~ Ra (max.), and diameter tolerance is 48.488 mm |+ or -~0.0065 mm. All five machines are equipped with automatic part loading/unloading and in-process gaging. The cell is designed to function as an integral part of a larger transfer line for processing of transmission components. Within the cell, machine control is provided by 80386 PC-based controls. Superfinishing transmission components and other parts from hard-turned surfaces eliminates the intermediate machining and/or grinding grinding, process by which surface material is removed from an object, usually metal, by the abrasive action of a rotating wheel or a moving belt that contains abrasive grains. processes previously used. Stock removal rates and surface finishes depend on the grit, bond hardness, and composition of the abrasive stone used, and for tape on the type of backing, grit size, and abrasive composition. |
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