Material selection for improving the bearing capacity of the NBD710-35.5 planetary reducer base
1. Base material optimization
Ductile iron (QT500-7/QT600-3) : Ductile iron has high strength (tentic strength 500-700MPa) and excellent shock absorption performance (shock absorption coefficient ≥0.15), which can effectively reduce the impact of gear meshing vibration on the base, and is suitable for heavy-load conditions.
Advantages: Good casting performance, cost 30%-50% lower than cast steel, and can further improve rigidity through reinforcement design.
Casted steel (such as ZG270-500) : Suitable for extreme heavy load or impact conditions, with tensile strength ≥500MPa, but attention should be paid to stress relief treatment after welding or machining.
2. Reinforcement of key connector materials
Anchor bolts and connection bolts : High-strength alloy steel (such as 40Cr or 42CrMo) is used. After tempering and tempering (quenching + high-temperature tempering), the tensile strength can reach 800-1100MPa, which significantly improves the connection reliability between the base and the reducer.
3. Surface treatment and protection
Place surface hardening : Shot peening of ductile iron bases or coated with wear-resistant coatings (such as epoxy resins), which can improve surface hardness and corrosion resistance and extend service life.
4. Auxiliary structure design
Reinforcement ribs and support structures : When designing the base, reinforcement ribs are added (thickness ≥ 1.5 times the thickness of the base wall) and adopt a modular design (such as split bases) to disperse stress concentration.
5. Lubrication and sealing materials
High-performance grease : Use lithium-based grease (such as No. 2 lithium-based grease) containing MoS₂ or extreme pressure additives to reduce friction and wear between the base and the reducer contact surface.
6. Dynamic load adaptability optimization
Impact Toughness Material : If the base needs to withstand frequent start-stop or impact loads (such as mining equipment), 42CrMo alloy steel can be used, and its impact toughness (αk≥40J) is better than ordinary carbon steel.
Summarize
Through material upgrades (ductile iron/cast steel), key parts reinforcement (40Cr/42CrMo bolts), surface treatment and structural optimization, the bearing capacity and impact resistance of the NBD710-35.5 reducer base can be significantly improved
