Screw & barrel for rubber machine

▌Brief Introduction:

We can manufacture rubber machines’ screw barrel for applications such like: shoe materials, wires and cables, seals, tires etc. We have skilled and experienced workers who can do finish machining for the rubber screw’s complicated structures. Also we have advanced self-created technic which is the bimetallic welding for narrow screw flight for big diameter(>=Φ150mm) rubber screws, this can satisfied customers who use easy worn down raw material, effectively extend the life time of screws.

▌Specification:

Screw diameter: Φ15-Φ300mm

Screw length≤10000mm

▌Basic material:

38CrMoAlA (JIS SACM645)

SKD61 (4Cr5MoSiV1)

▌Basic Technics:

Tempering treatment

Nitriding treatment

Vacuum quenching

▌Optional additional Technics:

Bimetallic welding / Bimetallic centrifugal casting

Chrome plating

▌Technical Parameter:

Hardness after tempering: HB260-320
Nitriding hardness: 850-1000HV
Nitrided layer depth: 0.5-0.8mm
Nitrided brittleness: Less than grade 2
Surface roughness: Ra0.4
Screw straightness: 0.015mm

Double bimetallic layer depth: 2-3mm

Chromium layer thickness: 0.03-0.08mm