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Edward Lowton
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Gentle smoothing of guide vanes
18 September 2018
At the ALUMINIUM 2018 exhibition Walther Trowal will present its new process for the gentle surface finishing of guide vanes used in turbines and compressors. It creates very smooth surface readings and, thus, optimises the airflow through the guide vanes.

After they have been milled from a cast block of aluminium, guide vanes for turbines or compressors require a very smooth surface to ensure optimum airflow around every single blade. To date this required a complex and costly mechanical process.
Walther Trowal has recently developed a method that allows the gentle smoothing of the guide vanes after milling without rounding the leading edges beyond the acceptable tolerances – an important factor for increasing the efficiency of jet engines.
Basis for the new process are the rotary multi vibrators of the model range MV allowing the processing of guide vanes with diameters of up to 800mm. The company uses special, extremely small ceramic grinding media, which provide not only optimum surface coverage on the work pieces but also smoothens the surface at the root of the vanes.
The guide vanes, but also blisks, are mounted to a fixture that is magnetically attached to the base of the processing bowl. This ensures that the overlapping, high-frequency vibrations from the multi vibrator are transferred to the work piece, causing intensive contact between the media and the vane surface areas.
The result of the fully automatic finishing process: The milling lines from the preceding machining step have been ground out creating a very smooth surface. With the new process Walther Trowal reduces the Ra surface readings from 4.0 down to 1.0µm with only minimal rounding of the leading edges
At ALUMINIUM 2018 Walther Trowal also presents rotary vibrators used for the surface finishing of aluminium castings including the removal of burrs.
- Gentle finishing of extremely thin work pieces
- Cleans greasy parts
- Coater for small batches
- Gentle finishing of hard surfaces
- Efficient coating of O-rings
- Gentle finishing of thin work pieces
- Coater for small batches
- Walther Trowal: New modular controls enhance the process safety of mass finishing applications
- Finishing machines on show at the Deburring Expo 2017
- Continuous shot blast machine