Zhoushan Jinmao Machinery Manufacturing Factory

Bimetallic screw barrel

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Overview
For its excellent anti-erosion/corrosion and anti-abrasion characters, the bimetallic screws and barrels are widely used in the extrusion lines.With HVOF high speed spraying equipment,spray a layer of metal which melt on the screw surface; a melt-cast method is adopted to get bimetallic barrel,which could conform its precise formation.The bimetallic barrel that means one layer is cast on the inner of the barrel with 2-3mm alloy of anti-abrasion, erosion proof and high-temperature. Contrast to common nitr ided barrel, its useful service life will be greatly improved. Bimetal lic has more obvious advantages. Applied to special engineering plastic such as kinds of glass fiber additives, fluoride plastic, PPO etc .    We can manufacture all types of screws and barrels according to clients' requirement.  

Base Materials:

1)38CrMoAlA(SACM 645)

2)40Cr

Bimetallic Alloy Materials:

1)Fe-based alloy

2)Ni-based alloy

3)Co-based alloy

4)Tungsten carbide

Processing Technology: 

Heat treatment

High-frequency quenching 

Nitriding treatment

Hard-chrome electroplating 

Bimetallic alloy welding

Bimetallic alloy centrifugal casting

Technical Parameter:


Nitrided layer depth:0.50-0.80mm

Nitrided hardness: 900-1100HV 

Nitrided brittleness: Less than 2 level

Surface roughness: Ra 0.4

Linearity of screw: 0.015mm/m

Chrome plating hardness after nitriding: ≥950HV

Chrome-plating layer depth: 0.025~0.10mm 

Bimetallic layer depth: 3-5 mm

Bimetallic hardness: HRC50-65

 

Product Categories : Segment Screw & Barrel

Home > Products > Segment Screw & Barrel > Bimetallic screw barrel

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