Lafer PVD, CVD and DLC coatings have found widespread use in the molding industry because they help to prolong the working life of molds, significantly reducing downtime, ordinary maintenance and production costs.
The applications for Lafer coatings are principally:
Lafer coatings find widespread use in the field of plastic molding, because they improve the mechanical characteristics of molds surfaces, according to the specific requirements of the sector.
The surface quality of a mold is a fundamental element in all plastic molding work: the better the mechanical characteristics of the mold, the better will be the molded piece produced, its productivity, its working life and the optimisation of maintenance costs.
Lafer coatings protect mold surfaces, significantly increasing their surface hardness, reducing the friction coefficient of moving parts, increasing resistance to wear and corrosion and grant anti-sticking properties, offering improved precision and easier detachment from the molded piece.
Lafer coatings for plastic molding are used in the following sectors:
(All of our coatings for plastic molding meet cytotoxicity requirements prescribed by the ISO10993-5 and REG. EU 1935/2004 norms relating to suitability for contact with food)
Lafer coatings for plastic molding can be used for::
The processes of cold forging, whether it be sheet metal deformation, embossing or cutting, subject the elements involved (the punches, the matrices, the molds) to problems of sticking, precision and surface wear. Therefore, it is necessary to protect the molds from abrasive wear suffered during machining with a targetted management of the surface finishings.
Lafer coatings for cold forging, Red Speed Lafer and Duplex Red Speed Lafer, possess very low friction coefficients and offer improved performance because they reduce the problems of sticking, and promote the detachment of the cut or molded material, thereby improving precision and lessening the formation of burrs.
In the coming years cold forging will become even more important in the sector of high resistance steel machining in the automotive industry. These steels, named Dual Phase (DP) present a ferritic/martensitic mixed structure with high ultimate tensile strength (Rm up to 1,200Mpa) and yield strength (Rp0.2 up to 700Mpa): for example their use in the construction of the chassis for the new Fiat 500 constitutes as much as 65% of the total weight of the car. Their use subjects tools and molds, from design to final coating, to significantly higher stress than that for conventional ferritic steel, which results in difficult tolerance controls on the final product. Lafer has responded to the needs of this particular application with Duplex Red Speed, consisting of plasma nitriding with subsequent PVD coating in a single cycle.
This innovative system allows a reduction of processing time, an excellent adhesion of the coating to the nitride sub-layer, due to the absence of the white layer (normally present in ionic nitriding processes), and a drastic reduction in cutting edge brittleness (typical in the processes of nitriding alone).
To further reduce the problems of materials sticking, friction between moving parts and to prepare the surface for the coating phase, Lafer treats the cold forged materials with a special polishing method. It is one of the most effective methods for preparing surfaces and renders the base perfect for PVD coating, as well as obtaining a controlled roughness even less than 0,10μm. Lafer polishing reduces surface roughness. With this procedure, a compression surface tension state of approximately 10μm depth on the material.
Lafer coatings for cold forging are used in the following sectors:
Lafer coatings for cold forging can be used for:
In the field of forging, the Lafer Method is employed on all components which determine proper functioning of mold elements and which provide easy detachment from the molded piece, reducing to a minimum the factors which can lead to poor yield from the mold.
The method developed by Lafer consists of choosing the most suitable coating, with a reference to the base material of the mold, the correct thermal treatment and preparation of the surface with the most advanced microblasting techniques, in order to obtain the most suitable roughness.
Forging, and in particular pressure die casting in aluminium and zamak, place great stress on the mold due to thermal fatigue, which causes the propagation of cracks below the surface, creating problems of adhesive and abrasive wear.
Lafer has responded to these problems with the Tigral and Duplex Tigral coatings, the principal characteristic of which is an extremely high resistance to oxidisation at high temperatures.
The advantages are significant: the increase in abrasive wear resistance, the substantial reduction in metal sticking effects and subsequent maintenance required.
Lafer forging coatings are used in the following sectors:
Lafer forging products can used for: