8 kinds of gear heat treatment processing and purpose description

1. Normalizing

Treatment: Heat the steel to above the critical temperature and keep it warm for a while, then take it out of the furnace and cool it in air.

purpose:

a. For steel parts containing less than 0.5% carbon steel, normalizing is often used instead of annealing.

b. Improve the cutting performance of low carbon steel.

c. Refine grains to improve strength and toughness.

d. Those that do not require high mechanical performancegearFor parts, normalizing is often the final treatment.

2. Annealing

Treatment: Heat the steel to a suitable temperature, keep it warm for a while, and then slowly cool it down.

purpose:

a. Refining the grains, uniform organization, and improving the mechanical properties of steel.

b. Eliminate the internal stress generated by the previous process.

c. Prepare for the subsequent heat treatment.

d. Improve toughness and plasticity.

3. Tempering

Treatment: After quenching, perform high temperature tempering at 450 to 650 degrees Celsius.

purpose:

Achieve complete elimination of internal stress and obtain higher comprehensive mechanical properties.

4. Cyanation

Treatment: The process of simultaneously infiltrating carbon and nitrogen atoms into the surface of steel parts.

purpose:

Improve the hardness, corrosion resistance, fatigue strength and wear resistance of the gear surface.

5. Nitriding

Treatment: The process of infiltrating nitrogen atoms into the surface of steel parts.

purpose:

Improve the hardness, corrosion resistance, fatigue strength and wear resistance of the gear surface.

6. Surface hardening

Treatment: Use high-frequency current or flame to quickly heat the surface of steel parts above the critical temperature and cool down quickly.

purpose:

The gear core maintains the original toughness and plasticity, while the surface has a higher hardness. The gear has a certain wear resistance and can withstand a certain impact load.

7. Quenching

Treatment: Heat the steel above the critical temperature for a while and then cool it down.

purpose:

a. Improve wear resistance.

b. Improve strength and hardness.

8. Carburizing and quenching

Treatment: Heat to 900-950 degrees Celsius in carburizing agent, keep it for a while, then quench and temper.

purpose:

a. The tooth body center has a certain toughness.

b. Improve the wear resistance and hardness of the surface of the parts.

c. Improve the fatigue limit strength of the material.

The heat treatment of the gear directly determines the internal quality of the gear teeth, and the quality of the process will directly affect the strength, accuracy, noise and life of the product.Tooth profile processing and finishing after heat treatment are the key to manufacturing, and it also reflects the level of gear manufacturing.

The above is the relevant description of the 8 types of gear heat treatment, including but not limited to, if you have any unclear points or related processing requirements, you can consult EP for free.