Surface treatment

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    Vibro-abrasive machining (trovalisation) is a type of surface finishing treatment. It is either a dry process making use of abrasive pastes and a carrier, or a wet one with the application of technological fluid or water suspension containing an abrasive. The machined items and the abrasive are placed in the bowl of the machining tool. Next the container is put into vibration, and consequently the abrasive hits the surface of the item.

    The procedure is carried out in order to smoothen sharp edges, eliminate all irregularities from the element, clean it of grease and pollution caused during the production process. It is also used to polish the surface and prepare it for coatings to be applied.


    Sanding is a process of cleaning or shaping the surface by means of a jet of compressed air or liquid, containing an abrasive with granulation corresponding to a particular type of material. What is used as an abrasive most frequently is purified sand. The process provides an effect comparable to grinding, only it leaves a slightly rough texture.

    Sanding is used to clean the material of rust or any coatings that might have been applied before. It allows to eliminate quickly and completely safely any scratches and dirt from otherwise inaccessible places, such as pockets, corners, or grooves. It is also applied so as to level the surface and prepare it for painting.


    Glass bead blasting is an abrasive blasting treatment based on the same principle as sanding, only instead of sand (corundum) glass beads are used. The size of the abrasive is selected depending on the expected result. This method is ideal for purification of non-ferrous metals, elimination of rust, deposits, contaminations, and minor damages from highly fragile thin-walled products. It is also applied to improve mechanical properties of the material.


    Barrel finishing is a mechanical rotor-abrasive machining process on metal elements in the presence of an abrasive, e.g. resin or ceramic moulders. It is nearly the same as trovalisation, the only difference being that the machined elements and the abrasive are placed in a barrel, which in turn is put into rotation instead of vibration.  

    The abrasive rubs against the surface of the item, which consequently gets polished and cleaned of all dirt. This method is also practised when there is a need to degrease the surface, to eliminate splinters, as well as to matt or high gloss polish the material.


    Trimming consists in separating a finished casting from the excess material along its edges. The excess material is cut off in highly efficient hydraulic presses by means of precise trimmers. This method is used to remove flashes. Its goal is to polish the item, give it an appropriate shape, and guarantee its dimensions are compliant with the specifications.


    Shot blasting is a type of sanding. The procedure is carried out by means of an ejection turbine or pneumatic nozzles generating a compressed air jet (the abrasive carrier). It can be a dry or wet process in a shot blasting chamber in the presence of an abrasive in the form of pellets, e.g. steel shot.

    Shot blasting is used in order to purify and strengthen the material. Very often it is also applied to polish the surface, and by removing the previously applied coatings, paints, varnishes, contaminations, and corrosion it helps to prepare it for further processing.

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