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Screw And Barrel For Twin Screw Plastic Extruder
1. Descriptions
Shaft is spline design which is good for torque distribution.
Using 40CrNiMoA material, the compactness is increased by forging and processing, and the material torque is improved by heat treatment process.
Chemical composition of materials:
| Element | C | Mn | Cr | Ni | Mo |
| Content | 0.37-0.44 | 0.50-0.80 | 0.60-0.90 | 1.25-1.65 | 0.15-0.25 |
2 .Twin screw extruder screw element parameter:
Model | Screw Major Diameter (D/mm) | Screw Minor Diameter (d/mm) | D/d | Center distance(mm) |
| BM-20 | 21.7 | 14 | 1.55 | 18 |
| BM-25 | 25 | 16.1 | 1.55 | 21.2 |
| BM-35 | 35.6 | 23.6 | 1.51 | 30 |
| BM-50 | 50.5 | 32.5 | 1.55 | 42 |
| BM-52 | 51.4 | 33.8 | 1.52 | 43 |
| BM-60 | 59.6 | 43.8 | 1.37 | 52 |
| BM-65 | 62.4 | 40.5 | 1.54 | 52 |
| BM-68 | 69 | 49 | 1.40 | 60 |
| BM-70 | 70.6 | 47.4 | 1.49 | 60 |
| BM-75 | 71 | 47 | 1.51 | 60 |
3. Mechanical properties of materials
Density (kg/m3): about 7830
Elastic modulus (GPa): 209
Tensile strength: b (MPa): ≥ 980 (100)
Yield strength: s (MPa): ≥ 835 (85)
The elongation is 5%: ≥ 12
The reduction rate of the cross section (%): ≥ 55
Impact energy Akv (J): ≥ 78
Impact toughness value of alpha kv (J/cm): ≥ 98 (10)
4 . Pictures:
