1 Turboshaft vane and groove grinding. Dressable CBN wheel peel grinds the vane outside profile. Metal bond non-dressed wheel grinds the groove(s), separate operations. Pairs of machines have been supplied with pre-process part monitoring, post process size control, linked handling and with post grind stations for superfinishing, deburring, washing and final inspection. 2 Grinding carbide disks (cutter knives) using diamond wheels dressed with a silicon carbide rotary dressing system. High stock removal, the parts handling system grinds both sides of the component incrementally to maintain flatness 3 Grinding diesel injector nozzle tips on a fixed mandrel (locating in the valve seat) with a lunette centre, and friction driver consisting of opposed rotating elastomer wheels. Two such spindles are fitted in an indexing workhead, largely eliminating the time to load and unload the workpiece and giving very fast cycle times. 4 Oilwell drilling tool bits composed of a diamond wear face on a tungsten carbide body are ground on 2 ends with either chamfer or radius. The diamond grinding oscillates across the workpiece, which rotates in a spindle itself mounted in a workhead which rotates about a vertical axis, thus generating the profile using 3-axis interpolation. The machine is fitted with post-process gauging and a separate robot wash / dry / palletise station. 5 'Grind-from-soild' application where very small (1mm diameter) valve parts are machined in 2 plunge cuts and parted off. A magazine supplies metre long stock lengths to a barfeed: The grinding spindle is fitted with a 3-jaw chuck, a swing-down tailstock supports the material at the free end. A cnc slide carrying a second chuck grips the part after grinding whilst a swingdown slitting wheel makes a cut. 'Conventional' Alox wheel with diamond roll dressing. 6 Thread grinding using plated CBN grinding wheel. Pump shafts requiring imm pitch threads with a given (variable) start point are ground with a multi-groove non-dressed wheel in less than half the time taken using old technology. The machine runs un-attended (apart from changing workpiece pallets) without gauging. Wheel lifetime in excess of 40,000 components. 7 Turbo vane shanks and faces are ground on a twin spindle machine with a secondary surface grinding station. Cylindrical grinding is with CBN wheel and diamond roll full-form dresser: Surface grinding with either dressable or plated wheel. The shank is gauged in-process whist the face is gauged post-process. Production rate 240 parts per hour.
~Engineering, Design, Colchester, Great Britain
Cylindrical cone grinding on surface grinders-semi auto. Grinding "squashy" cylinder liners with in process gauging and dwell to finish allowing for wheel deterioration. Grinding shafts with ball bearing grooves in one op. Grinding Track rod ballpins with tapers in one op with auto loading. Plunge then back through-feeding stepped shafts. Grinding shaped forms on blanks for pressing on modified centreless m/c. Orientating and loading jet engine parts with odd (a-symetrcal) heads for stem grind. Loading washer type spacers and feeding through centreless grinder safely.
~Robert S, Maintenance & Engineering Manager., Solihull, United Kingdom
I HAVE GROUND EVERY THING YOU CAN THINK OF ON A SURFACE GRINGER AT ONE TIME OR ANOTHER,ITS JUST TRING TO HOLD YOUR PIECE
~JIM M, Technical Support, GUADALAJARA, MEXICO