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What are the heat treatment methods for gear forgings?

(Summary description)In the processing process, gear forgings need heat treatment to achieve the desired performance requirements through manual heating, insulation and cooling. Generally, the heat treatment methods of gear forgings are as follows.

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What are the heat treatment methods for gear forgings?

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What are the heat treatment methods for gear forgings?

(Summary description)In the processing process, gear forgings need heat treatment to achieve the desired performance requirements through manual heating, insulation and cooling. Generally, the heat treatment methods of gear forgings are as follows.

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In the processing process, gear forgings need heat treatment to achieve the desired performance requirements through manual heating, insulation and cooling. Generally, the heat treatment methods of gear forgings are as follows.
 
1. Surface hardening of Gear Forgings: it is commonly used for medium carbon steel such as 45.40cr steel and medium carbon alloy steel. Generally, the tooth surface hardness after surface hardening is between 40 ~ 55HRC. It has fatigue pitting corrosion resistance, strong adhesion resistance and wear resistance. Because the tooth center is hardened at the end, the gear forging has enough toughness and can withstand small impact load.
 
2. Carburizing and quenching of Gear Forgings: commonly used in low carbon steel and low carbon alloy steel such as 20.20cr. In important gear transmission, the tooth surface hardness after carburizing and hardening treatment can reach 56 ~ 62Hrc, but it still has high toughness. The gear forging has high bending force and tooth surface contact strength, and has good wear resistance. It is often used in important gear transmission. Gear forgings with carburizing and hardening treatment have large tooth deformation, so gear grinding treatment shall be carried out.
 
3. Nitriding of Gear Forgings: nitriding is a surface chemical heat treatment. The hardness of the tooth surface after nitriding treatment can reach 700 ~ 900HV. Due to the nitriding treatment of gears, due to its high hardness, low processing temperature and small deformation, it is suitable for internal gears and hard to wear gears. It is commonly used in nitriding steel containing chromium, copper, lead and other alloy elements, such as 38CrMoAlA.
 
4. Adjust the quality of Gear Forgings: it is usually used in medium carbon steel and medium carbon alloy steel, such as 45.40cr.35simn steel, etc. The hardness of hardened and tempered tooth surface is usually 220 ~ 280hbs. Because the hardness is not high, the gear forging can be finished after heat treatment.
 
5. Normalized gear forging: normalizing can eliminate internal stress, refine grain, and improve mechanical properties and cutting performance. Medium carbon steel normalizing and large gear forging can be used to normalize the cast steel of large gear forging.
 
When the transmission gear is forged, in order to reduce the bonding force and ensure the service life of the gear, the tooth surface hardness of the pinion is usually 30-50 times higher than that of the large gear. For the transmission of high speed, heavy load or important gear forgings, hard tooth surface gear combination can be used, and its tooth surface hardness is almost the same.

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Previous: How many heat treatment processes are there?
Next: Annealing, normalizing, quenching, quenching and tempering... Can you distinguish these heat treatments clearly?

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