ASP02 - Perucchini

ASP02/E
Full Shell Moulding for wear resistant castings
Complex shapes with accurate tolerances and smooth surfaces
Fig. 1 - Antiwear gripping casting
Perucchini full shell moulding process allows to obtain cast iron parts with a high wear
resistance, comparable to the traditional and more expensive materials: hardened and
nitrided steel or Cr-hard cast irons.
Successful examples of such developments are: precision gripping (Fig. 1) and clampings
(Fig. 2) components for wood-working machines and a series of chopping segments for
the biomass production (Fig. 3). These solutions allow a 30% costs reduction respect to
traditional steels, whilst granting an unchanged products functionality and a greater
resistance at sub-zero temperatures.
The graphite and ausferritic structure of these castings also provides a valuable noise
reduction especially appreciated in gears applications (Fig. 4).
Fig. 2 - High precision clamp
The wear resistance of the austempered cast iron does not decrease with the abrasion of
the surface of the pieces, as it happens for the hardened or nitrided steel. Moreover, the
mechanical action, due to rubbing, creates a self-tempering effect that further increases
its hardness.
The liquid metal is prepared with a specific metallurgy and the resulting castings undergo
the austempering heat treatment which modifies the internal structure of the cast iron,
strongly boosting the wear resistance and increasing the mechanical properties, such as
tensile and yield strength.
Fig. 3 - Cutting Edge Knife
Perucchini foundry utilizes the Full Shell Moulding process, which consists in cores and
shells obtained with pre-coated fine silica sand. This moulding process allows to improve
the casting’s mechanical properties thus providing following advantages:
• strict dimensional tolerances
• low internal and external surface roughness
• lack of reactions between metal and sand shells
• rough surfaces not requiring further machining operations
• thin thicknesses
• highly complex shapes
• important rejects reduction after machining
Fig. 4 - High resistant automotive gear
For further information look at www.perucchini.com
ASP02/E
synthetic version
Full Shell Moulding for wear resistant castings
High resistant automotive gear
Perucchini high wear resistance iron castings successfully replace in wear resistant applications traditional and expensive materials
(hardened and nitrided steel or Cr-hard cast irons), thanks to:
• more than a 30% costs reduction respect to traditional steels
• complex shapes with accurate tolerances and smooth surfaces
• deep wear resistance and increased mechanical properties, thanks to austempering treatment
• unchanged products functionality
• greater resistance at sub-zero temperatures
• valuable noise reduction especially appreciated in gears applications
The wear resistance of the austempered cast iron does not decrease with the surface abrasion as it happens for the hardened or
nitrided steel.
For further information look at www.perucchini.com