The ring gear casting is an annular casting produced through precision casting technology, commonly used as a key component in heavy machinery to bear radial loads. Its process includes mold design, metal melting, casting forming, heat treatment, and machining, ensuring dense casting structure, uniform performance, and finished products in golden yellow (such as bronze) or silver-gray (such as cast steel or cast iron) with high-precision tooth profiles.
Product Applications
The ring gear is mainly used for support and transmission in large rotary equipment, specifically including:
1. Mining machinery: rotary support for ball mills and crushers, bearing heavy loads and impacts;
2. Cement equipment: ring gear for rotary kilns, resistant to high temperature and wear conditions;
3. Lifting equipment: rotary support for tower cranes and port machinery, ensuring smooth operation;
4. Construction machinery: travel ring gear for excavators and shield machines, adapting to complex terrains.
Product Features
1. High-precision forming: achieves complex structures such as tooth profiles and hole positions through precision casting, with dimensional tolerances reaching IT7-IT9 levels, reducing subsequent machining;
2. Excellent mechanical properties: materials selectable from cast steel (ZG270-500), cast iron (HT250), or bronze (ZCuSn10P1), featuring high yield strength (≥270MPa) and wear resistance, suitable for heavy and alternating load conditions;
3. Structural optimized design: annular cross-section design enhances bending stiffness, with dense internal structure (porosity <0.5%), effectively resisting fatigue failure;
4. Surface strengthening treatment: tooth surface carburizing and quenching (hardness HRC58-62) or sprayed wear-resistant coatings, improving anti-galling and corrosion resistance.
Product Functions
1. Support function: bears the equipment's own weight and dynamic loads, distributing pressure to sliding or roller bearings;
2. Transmission function: transmits torque (up to over 1000 kN·m) through meshing tooth profiles with pinions, enabling rotary motion;
3. Guiding function: guides stable axial movement of equipment, reducing runout error (radial runout ≤0.5mm);
4. Vibration damping function: internal grain boundaries absorb vibration energy, reducing operating noise (reduction up to 20dB).
Product Technical Parameters
Parameter Category |
Parameter Range |
Description |
Material |
Cast steel, cast iron, bronze |
Customized alloy composition according to working conditions |
Outer Diameter |
φ500mm - φ5000mm |
Precision casting covers medium to large sizes |
Inner Diameter |
φ400mm - φ4500mm |
Matches equipment spindle or cylinder |
Height |
100mm-800mm |
Section height designed according to load |
Tolerance Grade |
IT7-IT9 |
Complies with GB/T 6414 standard |
Hardness |
HB200-300 (body) |
HRC58-62 (tooth surface quenching) |
Applicable Temperature |
-40℃ to 450℃ (carbon steel) |
Bronze applicable temperature ≤300℃ |
Surface Treatment |
Carburizing and quenching, MoS₂ spraying |
Enhances surface wear resistance |
Note: Specific parameters are customized according to customer drawings; heat-resistant cast steel (e.g., ZG35Cr24Ni7SiN) can be selected for high-temperature conditions.
Typical Application Example
In a Φ4.6×110m rotary kiln, a ZG35CrMo cast steel ring gear (outer diameter Φ5800mm, height 500mm) is used to transmit torque through tooth meshing, supporting a cylinder weight of about 80 tons. After 4 years of operation, wear is less than 0.5mm, meeting the continuous operation requirements of mining.
This product integrates material science, casting technology, and structural design, providing core support for reliable operation of heavy equipment. Material testing, metallographic analysis, and finite element simulation services are available according to user requirements.
Keywords
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