:: New Barrel Manufacture ::
TWS can manufacture Extruder and Injection barrels either in Nitriding steel (EN41B) or with a Bi-metallic bore.
Nitrided barrels can be manufactured with any size bore and offer a good all round performance for general purpose use.
The Nitriding process we use are the gas nitriding and plasma nitriding which produce a nitrided layer that penetrates to a minimum depth of 0.6mm and a hardness of approximately 65/70 HRC.
Bi-metallic barrels are more suitable for higher wear & corrosion applications.
There is several bore linings available depending on the application.(see table below)
Bimetallic barrel blanks are manufactured using a centrifugal-casting process. The term Bi-metallic indicates the fusion of two different metals in a high-temperature furnace that subjects the two metals to temperatures of more than 1100°C.
High revolution spinning of the white-hot cylinder fuses the inlay alloy to the bore wall. Subsequent carefully controlled cooling creates a super-hard, highly uniform lining in the cylinder bore, which is then honed to the finished internal diameter. The finished bore lining is at least 1.5 mm thick and on most coatings is 2/2.5 mm thick.
|
Type |
Resistance |
Hardness HRC |
Alloy Base |
|
|
Abrasion |
Corrosion |
|||
|
TWS 100 |
High |
Low |
60 – 64 |
Fe |
|
TWS 200 |
Excellent |
Medium |
62 - 68 |
FeCr |
|
TWS 300 |
Medium |
Maximum |
50 - 54 |
NiCo |
|
TWS 400 |
Excellent |
Maximum |
55 - 59 |
NiCr |
|
TWS 500 |
Maximum |
Maximum |
56 – 60 |
Ni + WC |