摘要:
The method of manufacture of a hydraulic cylinder in which a piston for the cylinder is formed from a steel workpiece which is rotated and a bronze overlay fused into its surface while it is rotating, the overlay being continuously monitored and machined to a precise diameter. Thereafter, spaced ring grooves are cut into the piston.
摘要:
A method produces hollow gas exchange valves, in particular with a cooling medium introduced into the hollow valve stem. The hollow of the valve stem is preferably drilled from the valve head side and, after the introduction of the cooling medium, sealed again by surfacing. A thin filling piece is inserted to a defined depth into the drilled hole temporarily holding the weld pool of the surfacing weld. By means of surfacing, it is possible to achieve cost savings over other sealing methods. The surfacing is preferably performed by a welding method in which the workpiece is not part of an electric circuit through which the welding energy flows. Preferable methods include gas welding, electron beam welding or laser welding. With these methods, so-called edge effects can be avoided.
摘要:
A process for the production of composite camshafts comprises the selective positioning of a plurality of cam elements on a camshaft and orienting the cam elements at a desired location with respect to the central axis of the shaft and thereafter securing the cam elements in place on the shaft.