process specification of screw and barrel:

specification:015-0360MM

The ratio of length to diameter:L/D=12-45

types of screw:

For good plasticizing effect,we have different design of screw barrel to meet customers demand.Gradual type,mutant type,wave type,barrier type,double screen type,shunt type,separation type,exhaust type,pin type,mixed type,double-head type,three-head ty e,multi head type etc.

The normal material of Screw and Barrel:

Materia1:38CrMoALA

Hardness after hardening and tempering:HB260° -320° Nitrided Hardness:HV950° -1000°

Nitrided Depth:0.50 -0.7mm Nitrided Brittleness:above 2 stage Surface Roughness:Ra0.4

Screw straightness:0.015mm

Hardess of surface chromium-plating after Nitriding:19501-1V Chromium-plating Depth:0.05 -0.10mm

Alloy Depth:0.8 -2.0mm Alloy hardness:HRC56° -65°

Alloy:iron,nickel,tungsten,molybdenum