Examples of machining methods and applications for gears with different precision levels

Different accuracy levelsGear processingExamples of methods and applications are provided for reference. For more information, please consult EP Technology for free.

5. Gears with precision grade XNUMX (precision grade):

1. Processing method: It can be processed on a precision gear machine with very small periodic error.

2. Final finishing of tooth surface: precision grinding.After the large gear is hobbed with precision hobbing, it is ground or shaving.

3. Tooth surface roughness: 0.8.

4. Tooth root roughness: 0.8-3.2.

5. Application: Wheels for precision indexing mechanism.It is used in high-speed occasions with relatively high requirements on running stability and noise.Gears for high-speed steam turbines, etc.

6. Peripheral speed (m/s):Spur gear20 or more, helical gear 40 or more.

7. Efficiency (%): above 98.5%.

6. Gears with XNUMX precision grades (high precision grade):

1. Machining method: high-precision gear machine is used for machining.

2. Final finishing of tooth surface: precision grinding or shaving.

3. Tooth surface roughness: 0.8-1.6.

4. Tooth root roughness: 1.6-3.2.

5. Application: It is used to rotate smoothly at high speed and require the highest efficiency and low noise.For indexing mechanism.Especially important aircraft gears.

6. Peripheral speed (m/s): spur gears to 15 and helical gears to 30.

7. Efficiency (%): above 98.5.

7. Gears with XNUMX precision grades (higher precision grades):

1. Processing method: It is processed on a high-precision gear machine.

2. Final finishing of the tooth surface: It is recommended to cut the gears without quenching with high-precision tools.Quenching requires finishing (grinding, shaving, grinding, derivation).

3. Tooth surface roughness: 1.6.

4. Tooth root roughness: 3.2.

5. Application: For high-speed, small load or reversal occasions.It is used for the feed of the machine tool, and the movement needs to be coordinated.Medium speed reduction gear.Aircraft gear.Herringbone.Medium-speed gears in herringbone teeth.

6. Peripheral speed (m/s): spur gears to 10 and helical gears to 20.

7. Efficiency (%): above 97.5.

8. Gears with XNUMX precision grades (medium precision grade):

1. Processing method: use Fancheng method or imitation method for processing.

2. Final finishing of the tooth surface: no gear grinding, shaving or grinding if necessary.

3. Tooth surface roughness: 1.6-3.2.

4. Tooth root roughness: 3.2.

5. Application: General mechanical gears without special requirements for accuracy.Shed, bed gear (except indexing mechanism).Especially unimportant aircraft, automobiles and tractors.Cranes, agricultural machinery, ordinaryGear for reducer.

6. Peripheral speed (m/s): spur gears to 6 and helical gears to 12.

7. Efficiency (%): above 96.5.

9. Gears with XNUMX precision grades (low precision grades):

1. Processing method: processing by any method.

2. Final finishing of tooth surface: No finishing is required.

3. Tooth surface roughness: 3.2.

4. Tooth root roughness: 6.4.

5. Application occasions: used in occasions that do not require high accuracy and work at low speeds.

6. Peripheral speed (m/s): spur gears to 2 and helical gears to 4.

7. Efficiency (%): above 95.

The above descriptions of different precision gear processing methods are for reference only. If there is any update without notice, more information can be consulted by EP brand free of charge.