Cleaning of hardening goods

The design of a cleaning system for a hardening shop is very demanding. It depends on many parameters, since on the one hand the spectrum of parts can range from the size of a screw to the size of a shaft for ship drives. Equally relevant are the process steps that precede and follow the cleaning. For the cleaning system, there are also sometimes extreme environmental conditions, such as high temperatures or open barrage fires at the hardening furnaces.

This means for component cleaning: Among other things, no flammable residues may remain on the parts or other interactions between cleaning media, deposits, gases, etc. and the furnaces may take place.

For the requirements in hardening shops, there is no such thing as an off-the-shelf machine.

The often cramped conditions in a hardening shop, the immediate vicinity of hardening furnaces, the special features of component geometries, as well as the process steps before and after require a system technology tailored to the customer’s needs.

The selection of the right cleaning medium in hardening shops is a difficult matter.

EVT recommends the use of non-flammable solvents such as perchloroethylene (PER), which has the advantage over the use of modified alcohol or non-halogenated hydrocarbons that the risk of deflagration in the hardening furnace is excluded. This can always happen when components do not come out of the cleaning plant one hundred percent dry, for example because they are heavily scooped. In this case, holes, recesses and other cavities hold the cleaning medium on the components. These then enter the hardening furnace, possibly directly. Flammable media can be a hazard here. If non-flammable solvents, such as chlorinated hydrocarbons (CHCs), can be used, the immediate vicinity of hardening furnaces to cleaning equipment is harmless.

Our customers production processes are not only made safer by our machine technology, but often also experience quality improvements with regard to the demands placed on their products.