Key Temperature Control Points in Shaft Forging

Temperature control is the core of shaft forging, directly affecting material plasticity and forging quality. The initial forging temperature needs to be precisely set according to the material type, such as approximately 1100℃ for carbon steel and approximately 1150℃ for alloy steel, to ensure the material is in the optimal plastic state. The final forging temperature must avoid being too low (e.g., no lower than 800℃ for carbon steel), otherwise cracks or work hardening may occur.

The heating process needs to be controlled in stages: the preheating stage (room temperature ~ 800℃) requires slow heating to reduce thermal stress; the heating stage (800℃ ~ initial forging temperature) can be heated up quickly; the soaking stage requires holding the temperature to ensure uniform temperature and avoid structural defects. For example, wind turbine main shafts need to be heated above 1200℃ for more than 2 hours to ensure the material is thoroughly heated.

Forging operations require dynamic adjustment: start forging with light blows to avoid insufficient core temperature; use heavy blows in the middle stage to efficiently deform within the optimal plasticity range; finish forging with light blows to prevent low-temperature cracking. For example, half-shaft forging uses infrared temperature measurement + PLC automatic control, with small temperature errors to avoid overheating. Temperature control is the key to improving the performance of shaft forgings.