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We Researched Bimetallic Barrel & Bimetallic Screw in China

Apr 28,2016

1.Research Background of Bimetallic Barrel & Bimetallic Screw

As a very important replace materials, plastic and rubber are used more and more. Therefore, various modified plastic---rubber are used widespread. For instance, some calcium, carbonate, kadine are added in the plastic---rubber for modifing, some fibrous glass, carbon fibre, boron fibre are added in plastic---rubber for enhancement. Due to putting these filler and reinforcer, the plastic's characteristics are changed. That shall make the plastic---rubber suitable for special purpose. But on the other hand, it can make the machinery heart - Barrels and screws to be seriously corroded and worn. These things will cost much time and manpower to repair or replace these parts. The production will go down.


The chief leading member of our Shanghai Omega Group Is the first creator in the bimetallic technology In the last century 80 's in China, researched and developed different kinds of alloy protective coat for the bimetallic barrel and bimetallic screw. After years of constantly to exploration and improved, the bimetallic barrel and bimetallic screw protected by different kinds of wear-resistant and corrosion-resistant alloy, to its excellent operation life and unmatched cost-performance, by industry widely praised, has made a significant contribution to the development of the country's industry.


2.What is the Bimetallic Barrel? How Many Kinds of Armour Alloy Layer There Are for The Bimetallic Barrel?

The bimetallic barrel consists of a general base material and an armoured layer which is homogeneously attached to the base material on inner diameter surface. It has an certain thickness and certain hardness. This layer is a wear-resistant alloy, or corrosion-resistant alloy, or both functions. This armouring layer is locked on base material in metallographic structure. These two kinds of material take different functions in hand, but form an uniform whole - The bimetallic barrel.

 


Bimetallic Barrel


Three kinds of armouring layer and its data of bimetallic barrel:

Properties

Ω101 Alloy

Ω201 Alloy

Ω301 Alloy

Wear Resistance

★★★

★★

★★★

Corrosion Resistance

★★★

★★★

Main elements

Fe-Ni-B

Ni-Co-Cr-B

Fe-Cr-Ni-B-Carbide

Hardness(HRC)

58~64

50~56

55~65

Breaking strain(%)

0.30

0.24

0.20

Elastic strain ( kgf / mm )

18600

215000

22000

Coefficient of thermal

    expansion (/℃)

15℃~250℃

10.0×10-6

11.9×10-6

11.2×10-6

15℃~400℃

10.5×10-6

12.6×10-6

11.9×10-6

★”Marks:★★★ Excellent; ★★ Very good; ★ Good

 

3.What is the Bimetallic Screw? How Many Kinds of Armour Alloy Layer There Are for The Bimetallic Screw?

There is an armouring layer on the top of screw thread, or on the surface of all over the screw working surface. It has a minimum contact wear ratio then it is running on the inside of barrle. The base material is one kind of high-strength and weldable、nitridable metal. Between this armouring layer and the base material, there is perfect material bonding. These two kinds of material take different functions in hand, but form an uniform whole - The bimetallic screw.

 

Bimetallic Screw


Three kinds of armouring layer and its data of bimetallic screw::

Alloy Name

Hardness(HRC)

Properties

Wear Resistance

Corrosion Resistance

FX 1

38~42

★★★★

FX 2

45~50

★★

★★★★

FX 3

52~56

★★★

★★★★

FX 4

58~60

★★★★

★★★★

Layer Thickness: 1.0~2.0mm

““★”Marks:★★★ Excellent ;  ★★ Very good;  ★ Good

 

Base Material of Bimetallic Barrel & Bimetallic Screw

Base Material

Hardness

Tensile Strength

Applications

S 45 C(45#)

HS 24~28

40~50 kg f / mm2

Extruder

SCM 440(40Cr)

HS 28~40

65~80 kg f / mm2

Extruder & Injection

SACM645 ( 38CrMoAlA )

HS 30~43

70~80 kg f / mm2

Extruder & Injection

SNCM 439 ( G10CrNi3Mo )

HS 35~45

70~85 kg f / mm2

High-pressure Injection

SUS 316 ( 0Cr17Ni12Mo2 )

HS 18~28

45~60 kg f / mm2

Corrosion-resistant Part

 

Chief Engineer Office / Shanghai Omega Machinery Co., Ltd 


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