1, wear-resistant, long life;
2, high temperature, high temperature deformation;
3, corrosion resistance, the material is corrosive;
4, good cutting performance;
5, high strength, can withstand high torque, high speed;
6, residual stress after heat treatment, thermal deformation is small.
The screw rotates in the barrel and friction between the material and the two causes the working surface of the screw and the barrel to gradually wear out: the diameter of the screw gradually decreases, and the diameter of the inner hole of the barrel gradually increases. In this way, the clearance between the screw and the barrel is slightly increased with the gradual wear of the two. However, since the resistance of the nose and the manifold in front of the barrel is not changed, this increases the leakage flow when the extruded material advances, that is, the flow of material from the diameter gap to the feed direction increases. As a result, the throughput of the extruder is reduced. This phenomenon in turn increases the residence time of the material in the barrel, causing the material to decompose. In the case of polyethylene, hydrogen chloride gas generated by the decomposition enhances the corrosion of the screw and the barrel.
Nitride depth 0.5mm-0.7mm
Surface hardness Hv960-1100
Straightness of screw 0.015mm/M
Surface finish 0.0Ra/um
Alloy layer hardness HRC>60*
Alloy layer depth 1.2mm-2.0mm
Rhodium plating hardness HV>850*
Rhodium plating thickness 0.03-0.06mm
Nickel-plated phosphorus tungsten surface depth 0.05mm-0.20mm