Address:Auto Parts Industrial Park, Jinji Town, Tianchang City, Anhui Province
What is the general use of automotive transmission gears?
Gears are the structural size and material strength to withstand the external load, which requires that the material has a high strength toughness and wear resistance; because of the complexity of gear shape, gear accuracy requirements, but also the requirements of good material technology.
Common materials for forging steel, cast steel, cast iron.
1 forged steel
According to the tooth surface hardness is divided into two categories
HB < 350, called soft tooth surface
H8 > 350, known as the hard surface
L. tooth surface hardness HB < 350
Process: forging blank, rough turning, tempering, normalizing, finishing
Common materials; 45#, 35SiMn, 40CrNi, 40MnB, 40Cr
With better comprehensive performance, the tooth surface has a high strength and hardness, and the tooth core has good toughness.
After heat treatment, the cutting precision can reach 8.
Simple manufacturing, economy, productivity, high accuracy requirements.
2 tooth surface hardness HB > 350
When using medium carbon steel:
Process: forging blank, often, rough cut, quenching and tempering, and fine cutting, high, intermediate frequency quenching, low temperature tempering, honing or lapping agent run, electric spark run.
Commonly used materials: 45, 40CrNi, 40Cr.
Tooth surface hardness of HRC = 48-55, high contact strength, good abrasion resistance.
The tooth core keeps the toughness, impact resistance, high bearing capacity.
The precision of the precision is 7.
Suitable for mass production, such as: gearbox load automobile, machine speed gear.
With low carbon steel:
Forging billet, normalizing, quenching, quenching and tempering, quenching and tempering, quenching and tempering, low temperature tempering. Up to 6, 7.
Common materials; 20Cr, 20CrMnTi, 20MnB, 20CrMnTo.