Barrel are one of the important components of plasticizing devices. In recently years ,there are many new developments found in the field of special plastic producing.According to the structure, it can be divided into unitary ordinary barrel, bimetal barrel, cordwood barrel and grooved barrel.
(1)Ordinary and unitary barrel
Most injection machines may choose unitary normal barrel ,this kind of barrel will use 45#, 38CrMoAIA or SACM645 as base materials. After the nitriding treatment ,the thickness of nitriding is 0.5~0.8mm, the hardness is HV800-HV900.
Moreover, the 30CrMoVg, 34CrAINi7, X35CrMo17, X22CrNi17,41CrAIMo7can also be the base materials when produce the ordinary and unitary barrel, these materials need siliconization or nitriding .
(2) Bimetal barrel
Bimetal barrels conform to the needs of modern plastics, especially for the needs of special engineering plastics. Through the combination of structure improved the stress distribution inside and outside the layer, which can effectively improve the service life of bimetal barrel and carrying capacity, meanwhile save the materials consumption and energy consumption. Specially suitable for processing Nylon plus fiberglass, PP plus extended fiberglass，reinforced material for car parts, Bakelite, magnetic powder, ceramic powder, magnesium powder, copper powder, metallic sintered products, halogen-free plastic,fluorine plastic, PVC plus calcium powder and engineering plastics. The injection molding machine and extruder have widespread used bimetal barrel 90% in developed countries have choosed to use bimetal barrel.
The bimetal barrels we produced are casted with alloy layer,the thickness of alloy layer could reach 2-3mm one side,in order to satisfy with the varies of customers ,we produce the following bimetal barrels:
Wc-10 tungsten carbide alloy, with the characteristic of high hardness, high hard-wearing, corrosion resistance, and high-temperature resistance, the hardness of alloy layer reaches HRC60°-65°, thus having the service life of five or six times longer than the nitrided barrel. It is suitable for the processing of PC plus 30%-50% fiber glass, bakelite, dynamoelectric injection machine, magnetic particle, ceramic powder, aluminum and magnesium powder, ferrous powder, copper powder,etc.
Ni-20 nickel base alloy, with the characteristic of high corrosion resistance and hard-wearing, the hardness of alloy layer reaches HRC58°-60°,thus having the service life of two or three times longer than the nitrided barrel. It is suitable for the PVC,PC and high strength engineering plastics,etc.
Fe-30 ferrous alloy, with the characteristic of high hardness ,high hard-wearing and corrosion resistance, the hardness of alloy layer reaches HRC60°-62°,and is suitable for Nylon plus fiber glass, PC plus fiber glass, and processing of the engineering plastics. This is a kind of more economic alloy products ,as well as the most used alloy products in the world.
Over 90% plastic machinery companies in developed countries use the bimetal barrel and screw. It is not only improving the grade of the entire injection molding machine, but also providing customers the high quality products. Using bimetal barrel and screw will be the famous machinery companies ' best choice in future.
H-10 (high hard-wearing),H-20(corrosion resistance),H-30( high corrosion resistance) H-50(high hard-wearing and corrosion resistance) are used widely in foreign.
BROOKES Company invented the BRUX100 barrels with the diameter of Ф25~Ф80mm,the hardness can reach HRC56°~63 °and the service life of five or six times longer than the nitrided barrel.
BERNEX bimetal barrels have two kinds of materials: “A110”alloy is based on Fe-B, which hardness is HRC58°~64°.The thickness of alloy layer is standard value of 1.5~2mm, maximum is 3~4mm.A110 alloy material can be grinding and EDM, but not welding. “C240”alloy is based on Ni-B-Co,which is strong corrosion resistance ,it can be processed by the hard alloy cutting tools and also be welded .
Generally, the overseas produce bimetal barrels, which precision of hole processing is H7, inner diameter is φ16~φ150mm,outer diameter is φ60~ φ300mm,length is 2500~4500mm.However our company can produce bimetal barrels, which precision of hole processing is H8, inner diameter is φ16~φ250mm,outer diameter is φ150~φ500mm,maximum length can reach 9500mm.
Our company is currently one of the world's largest manufacturers in producing bimetal barrel ,as well as one of the largest exporting bimetal barrels and screws companies.