Sold as a set 20mm Dia Extruder Screw, Barrel with 1.75/3mm Nozzle and Heaters

Description

20mm Dia Single Extruder Screw, 300mm Length Barrel and 1.75mm or 3mm Nozzle
for Desktop Plastic Extruders
Package contains:
1x 20mm Dia Screw, 1x Barrel, 1x 3mm/1.75mm Nozzle, 3x 150W D40L40 Band Heaters, 3x K-Type Thermocouples.
Technical Parameters:
Maximum rotation speed
: 60RPM
Maximum heating temperature: 450℃
Bimetallic layer depth: 3 mm
Bimetallic hardness: 57~69HRC
Hard-chrome plating hardness after nitriding: ≥950HV
Chrome-plating layer depth: 0.03-0.09mm
Surface roughness: Ra 0.4
Compression Ratios
:  20mm extrusion screw is 2.8
Technical Information:
Main Base materials
1.38CrMoAlA (SACM645)
2.SKD-61 (Special Tool Steel)
3.42CrMo (Ultrahigh Strength Steel)
4.DC53 (Cold Work Die Steel)
5.W6Mo5Cr4V2 (High-Speed Tool Steel)
Main Alloy Materials
1.Ni-based alloy/Deloro alloy
2.Tungsten carbide/Wolfram carbide
3.NiCo-based alloy
4.Fe-based alloy
5.Co-based alloy
Processing Techniques
1. Heat treatment
2. Quenching
3. Bimetallic alloy welding for screw
4. Bimetallic alloy centrifugal casting for barrel
5. Hard-chrome electroplating
6. Linearity of screw:0.015mm
Drawing:
Screw:
Barrel:
Picture
:
FAQs:
Q: What is the recommended speed for the screw?
A: About 21~35 rpm.
Q: The material of screw, barrel & nozzle?
A: The screw is made of SKD61 vacuum quenching, barrel is 38CrMoAlA not nitrided(plz contact us or leave a note if you need nitrided process)
and the nozzle is carbon steel.