Especially with the automotive industry, precision and low friction are a prerequisite for enhanced performance, functional safety, long life, and a more efficient consumption of energy and raw materials.
The use of Microfinishing or Superfinishing allows a production of defined technical surfaces and workpiece geometries in order to minimize friction and improve the degree of efficiency. The producible surface structure (defined by percentage contact area and various surface roughness specifications) can match the tightest demands at minimal tolerances including a certificate of proficiency. The micro and macro geometric deviations resulting from the previous process are eliminated reliably.
With automobile and engine production the following methods are being applied:
Use of stone and/or tape in combination with superimposed movement of the workpiece speed and a short stroke and/or long stroke oscillation of the tools for workpieces such as: camshafts, crankshafts, drive shafts, universal joints, steering shafts, steering racks, plungers of shock absorbers, and etc.
With spherical and flat workpieces (e.g. cylinder blocks, cylinder heads, tappets, ball pins, and pump elements for diesel and fuel injection systems) the workpiece rotation is superimposed on the rotation of a cup wheel.
With machining of flat surfaces from both sides (e.g. brake disks, con rods, pump rotors, cog wheels, clutch discs, universal joints, antifriction bearings, shift forks, valves, and tappets) we use double disc grinders with the workpiece being fed either with or without additional rotation through a grinding gap between two rotating grinding wheels.