The core materials of the NGW113-500 planetary gear reducer are divided according to component functions, mainly high-strength alloys and wear-resistant materials, taking into account load-bearing and fatigue resistance requirements.
Key component materials
1. Machine base (box): HT250/HT300 gray cast iron is mostly used, and QT450-10 ductile iron is used in some heavy-load scenarios . The castings need to be aged to eliminate internal stress.
2. Planetary gear, sun gear, internal ring gear: core transmission parts are commonly made of 20CrMnTi, 20CrNiMo and other alloy structural steels, which are carburized and quenched + gear grinding to ensure hardness (HRC58-62) and wear resistance.
3. Planet carrier: Use 40Cr or ZG310-570 cast steel . The welded planet carrier is welded and formed from Q355B steel plate, which requires aging or quenching and tempering treatment.
4. Shafts (input/output shafts, planetary shafts): mainly made of 40CrNiMoA and 42CrMo . After quenching and tempering treatment, the strength and toughness are ensured, and the matching parts are high-frequency quenched to improve wear resistance.
5. Bearings and fasteners: Bearings are mostly made of high-carbon chromium bearing steel (GCr15), and anchor bolts and connecting bolts are made of grade 8.8/grade 10.9 high-strength carbon steel or alloy steel.。
Material selection principles
High-strength alloy structural steel is preferred for transmission components, taking into account both hardness and toughness to meet the needs of heavy-load and high-speed working conditions.
The box body is mainly made of cast iron, taking into account both cost and vibration damping properties. It can be upgraded to cast steel for heavy loads or harsh environments.
The materials of all force-bearing parts must comply with national standards such as GB/T 3077 (alloy structural steel), GB/T 9439 (gray cast iron).
