Barrelling is a mechanical processing method for cleaning small metal parts thoroughly from slag, scale, grease and rust. Deburring and rounding of workpiece edges is also possible. Barrelling also removes minor material defects such as scratches.
We offer barrelling up to a maximum workpiece size of 100 x 200 mm and a part weight up to 3.5 kg.
We have two Rösler vibratory finishing machines in our machine park. Each tank holds about 300 litres. Abrasives of different sizes are located in the tanks so that we can react flexibly to different customer requirements.
Between the vibratory finishing machines is our vibratory rotary dryer. The parts are fed from the grinding tanks via filling slides into this tank, where they are dried by cork granulate. The dryer is set into vibration, just like the grinding machines, but additionally heated. The cork granulate dries the parts and removes remaining dry edges from the grinding fluid.
The desired processing degree is determined by the processing time. The longer the grinding process is continued, the more material is removed from the workpiece.
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The perfect finish
Between the two finishing machines stands our vibratory rotary dryer. The parts are fed from the finishing bowls via feed chutes into the dryer bowl, where they are dried by cork granulate. The dryer works like the sanding machines, but additionally heated. The cork granulate dries the parts and removes any remaining dry edges from the grinding fluid.
This workpiece has been cut to size, but has a few defects. Grease and scratches are spread over the entire surface. Some scale has settled on the cut edges and there are sharp burrs on the edges.
In barreling, work pieces are cleaned of dirt and burrs by the use of abrasive blocks. For this purpose, a large quantity of these bodies is placed in a drum together with the work pieces and are vibrated for a certain amount of time. The vibration causes that the workpieces glide along the abrasives. Due to the fact that the grinding process is carried out with little force, it can take up to several hours until the desired result is achieved.
There is a huge selection of different abrasives. They are available in different sizes, shapes and roughness grades. The surface quality can be compared to sandpaper. They are available in plastic or ceramic. Plastic abrasives are a little more gentle, but are not as durable as the ceramic ones.
The correct choice must be made with regard to size, material and work piece weight. The processing time also plays an important role. The longer the work pieces are treated in the barrel finishing machine, the more material is lost. For this reason, the grinding result must be visually checked on a regularly base.
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