HANNOVER MESSE 2020,
20 - 24 April
Laser Zentrum Hannover
A trade fair highlight is the laser processing head for internal surfaces (LZH-IBK), constructed by the Laser Zentrum Hannover e.V. (LZH). The fifth generation of the processing head makes it possible to structure internal surfaces, for example in an engine block.
The requirements for internal combustion engines for passenger cars are increasing: higher performance, lower weight, less fuel consumption and decreasing levels of contaminants. Novel aluminum engines are lighter than gray cast iron models and save fuel.
In engines of this type, however, the cylinder inner surfaces must be equipped with steel or gray cast iron bushings, as they have a higher strength and better tribological properties. A modern plasma spraying process enables the spraying of a steel layer onto the cylinder surface. The low wall thickness of the sprayed steel layer improves the heat dissipation and distribution in the engine.
To ensure that the steel layer adheres to the aluminum, the cylinder inner surfaces must be roughened before coating. Disadvantages of conventional methods are the tool wear or the contamination by the blasting material.
The LZH has therefore developed a laser-based roughening process. The laser processing head for internal surfaces has a spindle with a rotating beam deflection element. During the processing, a focused laser beam emerges, the spindle descends into the bore and the deflection element simultaneously rotates around the spindle. In this way, trench-like structures are introduced into the surface to be roughened and finally the steel layer is applied by thermal spraying.
Due to the contactless processing, laser heads do not wear out. Furthermore, it is not necessary to clean the engine blocks before roughening and after coating. Without additional set-up times and replacement costs the laser process is superior to conventional roughening processes.
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