Cylinder manufacturing and reparation

CONSTRUCTION

Barrel construction can be done following samples or drawings in various materials: standard nitrided, hardened steel (for small dimension items), bimetallic, where there are materials with high abrasion and corrosion.

REPARATION

Barrel reparation depends on construction material.

Standard nitrited and hardened steel barrels:
Basic purpose is to restore the correct tolerance between barrel, screw and screw-tip in order to bring back the moulding to the original level.

Internal bushing:
The overlay (partial or total) is carried out in X155CrV121. We always propose an offer for a new barrel in standard nitrited steel and bimetallic as an alternative.

Bimetallic barrels:
If barrels are in Bimetallic material, the only way to proceed is to increase the inner bore with the renewing or supply of the screw and of a series of valves (interchangeable with the existing) suitable for the cylinder. In such case the feasibility of this type of renewing is based on moulding material.

Main materials are:

• Nitrited steel (41CrAlMo7) 60 HRC
  It is a steel, with aluminium, chrome, molybdenum which, during the heat treatment, create nitruri very strong, which rise hardness of 1050 HV approx.
  This material is suggested where there are not problems of corrosion and wear.
  
• Hardened steel (X155CrMoV121) 58-60 HRC
  It has a very high percentage of chrome, which gives a good strenght and long life.
  This material is suggested where there are wear problems.
  Life: 2-3 times standard nitrided
• Bimetallic (abrasive and corrosive plastics) 62-69 HRC
  There is an internal layer of very hard material, with a thickness of 5mm approx, with a high resistance to corrosion and wear, with an hardness value up to 65 HRC.
  This material is suggested where there are corrosion and wear problems.
  Life: 4-5 times standard nitrided