Large Gear

A large gear is one of the commonly used mechanical parts, which is to transfer and change the direction of the torque, especially in the rotary kiln, the big gear is one of the key parts of the rotary kiln transmission, it is also widely used in other application that require high torque and low cost transimission.

1. Large gear is suitable for large torque operation.
2. OEM and customizable according to drawings.
3. Related transmission parts can be provided, like gearbox, motor, oil station, control system, etc.
4. Heavy Load, it can be separated into several segments, like 2 pieces, 4 pieces, and 8 pieces.

 

Forging: For some large gears that bear high loads, the forging process is usually used to produce blanks. Forging can improve the internal structure of the metal and improve the strength and toughness of the gear.

Cutting: The cutting of large gears requires the use of large gear processing equipment, such as gear hobbing machine, gear shaper machine, etc. In the process of machining, it is necessary to strictly control the machining accuracy to ensure the transmission performance of the gear.

Heat treatment: In order to improve the hardness, wear resistance and fatigue resistance of the large gear, it is usually necessary to carry out heat treatment processes, such as quenching and tempering. Heat treatment can make the gear obtain good comprehensive mechanical properties.

Surface treatment: In order to improve the corrosion resistance and wear resistance of the big gear, surface treatment can also be carried out, such as hard chromium plating, nitriding and so on. Surface treatment can improve the performance of the gear surface without changing the performance of the gear matrix.

The machining accuracy requirements of large gears are usually different according to their application scenarios, working conditions, equipment performance, and other factors, which can generally be viewed from the following aspects:
Precision grade aspect
3-5 high precision grade: For some large gears applied in the field of high-speed and high-precision transmission, such as the main transmission gear of aerospace and precision machine tools, 3-5 level accuracy is often required. For example, the large gear in the aircraft engine, in order to ensure the accuracy and stability of power transmission, its accuracy needs to be strictly controlled within this range.
6-8 intermediate precision grade: In general industrial fields, such as metallurgical equipment, cement machinery, and large gears in general mechanical transmission, usually 6-8 accuracy can meet the requirements of use. For example, the big gear of the ball mill in the cement factory has 6-8 grade accuracy to ensure its transmission smoothness and reliability under long-term heavy load operation.
9-12 low precision grade: For some occasions with low precision requirements, such as agricultural machinery, large gears in simple conveying equipment, may only need 9-12 precision.
 

Specific parameters
Pitch accuracy
Single pitch deviation: Generally high-precision gear requires control of ±5μm - ±10μm, medium precision in ±10μm - ±20μm, low precision can be above ±20μm.
Cumulative total deviation of pitch: For 6-level precision gear with a module of 5mm and a diameter of 500mm, the cumulative total deviation of pitch may be required to be ±30μm - ±40μm; Grade 7 accuracy is possible in the range of ±40μm - ±60μm.
Tooth shape accuracy: Usually the tooth shape error of high-precision gear needs to be controlled at ±5μm - ±10μm, the medium accuracy is ±10μm - ±20μm, and the low accuracy is ±20μm - ±30μm or even greater.
Gear direction accuracy: The gear direction error of high-precision gear is generally required to be ±5μm - ±10μm, the medium-precision is ±10μm - ±20μm, and the low-precision is ±20μm - ±30μm.
Radial runout accuracy: 6-level precision gear, radial runout may be required in ±20μm - ±30μm; Grade 7 accuracy may range from ±30μm to ±40μm.

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