Parallel twin screw and barrel
Specification:
Diameter: Φ35mm-φ200mm
L/D ratio:10-35
The compression ratio of screws can be designed according to different products
and raw materials.
and raw materials.
Material:
High quality alloy steel
1) 38CrMoAlA(JIS SACM645)
2) 42CrMo(AISI 4140)
3) Cr12MoV(JIS SKD-11)
4) 4Cr5MoSiVL(JIS-61)
5) 9Cr18MoV
Technics:
Heat treatment
Nitriding treatment
Hard-chrome electroplating
Bimetallic alloy welding
Centrifugal casting
Technical parameter:
|
Nitrided layer depth
|
0.5-0.8mm
|
|
Nitrided hardness
|
900-1000HV
|
|
Nitrided brittleness
|
Less than grade 1
|
|
Surface roughness
|
Ra0.4
|
|
Linearity of screw
|
0.015mm
|
|
Hard-chrome plating hardness
|
≥950HV
|
|
Chrome-plating layer depth
|
0.025-0.085mm
|
|
Bimetallic layer depth
|
2 mm
|