TIPS:

1.The injection screw should be constructed of materials that provide abalance of abrasion resistance and corrosion protection. Options forconstruction include 38 CrMoAlA nitrided steel with abrasion resistantcoating such as bimetallic or Tunsten carbide on screw flights.

2.The screw flights should not be chrome plated since reinforced orfilled composites will abrade or chip the plating in a short period.

Application
screw barrel in injection molding machine



Screw Barrel show:


Advandages of bimetallic

1. Corrosion resisting,
Some plasticmaterials such as Fluorine,PVC,ABS or add additive GF,etc,whentemperature rise higher,will send out corrosive gas, which will damageyour screw and barrel.Common nitrided screw barrel can not service longtime,But bimetallic screw barrel is different,the bimetallic layer couldresist the corrosion,make the screw barrel working life longer.Weguarantee you the working life is one year,but our customers always useseveral years.

2.Wear resisting
Some times,we also need to add some materials easy to wear,such asCaco3,or recycled materials,these materials are called badmaterials.Common nitrided screwbarrel also could not serve you longer. Maybe half year, you need tochange one set. In this situation,if you use our bimetallic screwbarrel,we can guarantee one year. But our customers always use severalyears.

We-HUACHEN bimetalilc standard:
1. Standard grade: 38CrMoAlA + nitriding 96 hours
2. Bimetallic grade: 38CrMoAlA + bimetallic alloy
3. HC-A grade: Tungsten carbide 40%
4. HC-B grade: Tungsten carbide 25%
5. HC-C grade: Tungsten carbide 15%

We-HUACHEN Bimtallilc Product Show:
Second hand extruder machine bimetallic screw barrel


Two types of bimetallic screw:
The bimetallic also could divide two types, like the above picture show:
Type 1:Sparying the bimetallic on the screw flight,this is very commonin the market. If your plastic material is not very very bad,we suggestyou choose this type, because of its economy.
Type 2:Coating the bimetallic on the whole screw,this is new technicalthese years. The advantage:Working life more longer than type 1,thedisadvantage: Price is also very higher than type 1.

Injection molding screw we process as the following technical parameter:
sheet 1

Materials of injection screw and barrel

Base Materials	1)38CrMoAlA(JIS SACM645) 2)Cr12MOV(JIS SKD-11) 3)4Cr5MoSiV1(JIS SKD-61)4)42CrMo(AISI 4140)
Bimetallic	1)Fe-based alloy 2)Ni-based alloy 3)Co-based alloy 4)NiCo-based alloy 5)Tungsten carbide/Wolfram carbide
Tungsten Carbide	Level A - containing Tungsten of 40% Level B - containing tungsten of 25% Level C - containing tungsten of9.5%

Sheet 2

Plastic material application

Plstic material application

1)General Plastics 2)ABS,PA,PC,PE,PET,PP,PS,EVA,PU,PVC,U-PVC,etc 3)PA + GF(Glass Fiber) 4)Flame-resistant Reinforced Plastics 5)Modified Engineering Plastics 6)All kinds of Mixed Recycled Material(in Scrap orGranule),etc

Sheet 3

Surface Treatment

Heat Treatment	High Frequency Treatment
Nitriding treatment(120 Hours)	Depth of Nitrided Layer: 0.5-0.8 mm Hardness of Nitrided Layer: 900-1020Hv(HRC56°-65°)
Hard Chrome Plating treatment	Thickness of Hard Chrome Plating Layer: 0.05-0.10mm Hardness of Hard Chrome Plating Layer: ≥950HV
Bimetallic treatment	Bimetallic Barrel/Cylinder: Centrifugal Casting (InlayAlloy) Bimetallic Screw: Plasma Alloy Coating Spraying Depth of Bimetallic Layer: >2mm Hardness of Bimetallic Layer:HRC55°-72°

sheet4

Basic information

Roughness of the surface	Ra0.4um
Linearity of the screw	≤0.015mm
Linear axis limit	≤0.02mm
Hardness after Hardening & Tempering	HB240-280
Fragility of Nitration	≤Two class

Various kinds of screw tips,non-return valve,check rings. We also accept small order like several screw tips or others.

About Huachen

Factory Show:



Machines&processing show:

Nitrogen oven & Bimetallic Oven show:

Testing:

Certificate:

Our packing:

   About HUACHEN
1.Our Strength: We have an experience of more than 20 year of manufacturing and designing Plastic machines, varied Screws and Barrels and spares.We concentrate on improving quality, updating design and enhancing service.
2.Our products: Screws Barrels for Injection, Extrusion, and Blow Molding applications; relevant accessories; plastic machinery.
3.Location advantage: Located in China's Screw Town - Jintang Town in Zhoushan City, near to Ningbo Port and Shanghai Port.
4.Market areas: Global sales network reaching South America, Eastern Europe, Southeast Asia, Africa, Oceania and the Middle East.
5.We promise: We assure the customer benefits, We provide competitive price, We Emphasis On Cooperation

Please contact us,if you have any questions. Mail,phone,skype all are OK.
My skype:lillianyao0421