OFFICINE MECCANICHE BAGNOLESI
Thermal treatments, surface treatments and coatings
Officine Meccaniche Bagnolesi carries out a series of processes according to the type of material used and specific requirements: from thermal treatments to surface treatments and coatings
Thanks to its long-lasting experience and the valuable support of several collaborators, Officine Meccaniche Bagnolesi has enhanced and optimized its working methods over the years in order to regularly raise the quality level. 90% of the machining is carried out on CNC machines: the constant investments in cutting-edge machines allow shorter times for the order to be processed and the execution even for the most complex projects. Every aspect concerning the manufacture of the rollers, from the supply of the material to the working cycle, is analyzed and evaluated carefully.
Thermal treatments
Stabilization
Through intense heat (600°C) the stabilization is a treatment that spreads the stresses due to the mechanical stresses on the material, returning it to its original shape and giving it structural homogeneity.
Hardening
Hardening is a heat treatment consisting in the abrupt cooling of a material to give greater hardness to the surface layer.
Surface treatments
Chrome Plating
Chrome plating consists of applying a chrome coating to the material to create a hard, rust-free layer. Based on the requirements, we may carry out two types of chromium-plating: Flash (a few hundredths of thickness) or hard (up to two tenths of thickness).
Nickel plating
Nickel plating, similar to chrome-plating, creates a protective layer of about 1 cent of nickel on the material and is best suited for “salty” environments where the risk of oxidation is higher, such as for example in the case of cooling chambers.
Copper plating
Copper plating is a specific treatment for rotary machines that require a rotogravure incision of an element that is repeated every time during the printing phase. In this case, the chrome plating is carried out first, then the copper plating and finally the engraving.
Galvanization
Zinc-plating consists of a layer of zinc to protect the rollers used for wood processing. This is a less accurate treatment than chrome plating and is more cost-effective.
Nitriding
Nitriding is a chemical process consisting in the deposition of nitrites which, by binding to the material, create a hard layer on it. The result is the same as quenching, but in this case, it is a chemical reaction.
Anodization
Anodization consists in the formation of a thin layer of oxide on the surface of the material, making it more resistant and lasting longer over time. The process is carried out by means of an electrochemical principle following the immersion of the roller in a particular dip.
Lapping
Lapping is a mechanical process that is carried out to lower the roughness of the roller and thus polish its surface.
Surface treatments
Chrome Plating
Chrome plating consists of applying a chrome coating to the material to create a hard, rust-free layer. Based on the requirements, we may carry out two types of chromium-plating: Flash (a few hundredths of thickness) or hard (up to two tenths of thickness).
Nickel plating
Nickel plating, similar to chrome-plating, creates a protective layer of about 1 cent of nickel on the material and is best suited for “salty” environments where the risk of oxidation is higher, such as for example in the case of cooling chambers.
Copper plating
Copper plating is a specific treatment for rotary machines that require a rotogravure incision of an element that is repeated every time during the printing phase. In this case, the chrome plating is carried out first, then the copper plating and finally the engraving.
Galvanization
Zinc-plating consists of a layer of zinc to protect the rollers used for wood processing. This is a less accurate treatment than chrome plating and is more cost-effective.
Nitriding
Nitriding is a chemical process consisting in the deposition of nitrites which, by binding to the material, create a hard layer on it. The result is the same as quenching, but in this case, it is a chemical reaction.
Anodization
Anodization consists in the formation of a thin layer of oxide on the surface of the material, making it more resistant and lasting longer over time. The process is carried out by means of an electrochemical principle following the immersion of the roller in a particular dip.
Lapping
Lapping is a mechanical process that is carried out to lower the roughness of the roller and thus polish its surface.
Coatings
Rubber
The rubber consists of coating the material with a layer of rubber. It can be carried out using different types of compounds (various colors, hardness and quality) according to the sector and to the customer’s needs.
Polyurethane coating
The principle is the same as rubber coating, the differences are due to the different characteristics of polyurethane compared to rubber.
Plasma coating
By means of a suitable laser, carbides are applied to the material, which are then fixed by compressed air. Generally, not all of the surface of the roller is coated. 5 cents of thickness is normally applied to the rollers subjected to high wear, in order to make them more resistant. By means of the same process it is possible to carry out ceramic, metallic or graphite coatings, according to requirements.