TECHNOLOGICAL CONDITIONS

REQUIREMENTS FOR THE PARTS TO BE HARD COATED

Tools and parts are deemed coatable if they substantially fulfill the following prerequisites:

COATABLE MATERIALS

• metal such as HSS, hot and cold working steel, stainless steel, cermets and tungsten carbides can be coated

• the parts must be able to withstand the temperature up to 500°C reached during the coating process (lower temperature is possible)

• brazed parts can be coated if the brazuing material is vacuu and temperature resistance (Cd and Zn is no acceptable)

SURFACE CHARACTERISTICS

• the surface of the parts must be bright

• there must be no burns on cutting edges

• ground surfaces must be free of griding and hardering residues

• the roughness of working surfaces should be as low possible (Ra<0,4 ?m)

• the parts must be free of machining chips

• the parts must be free of other coatings (Ni or Cr)

• nitrided parts can be coated

• residues from packaing materials are to be avoided

• inner surfaces with a width to depth ratio 1:1 can be coated

FIXATION

• a fixation possibility (bore, thread, shaft) must be provided

DATA TO BE INCLUDED

• designation, type of tool

• type of material

• dimensions (scale drawing, drawing, sketch) together with indentification of surfaces to be oated )one colour) and any surfaces that must not be coated (other colour)

• tempering temperature

• hardness (indicate points measured)

• hardering method:salts bath, inert gas, vacuum

• nitriding method: gas, bath, plasma

PACKING

• the parts should be lightly oiled to protect them form rusting

• inner packaging must be shock absorbed

• outher packaging must be multi-use