Views: 3 Author: Site Editor Publish Time: 2016-10-13 Origin: Site
Forging industry is a large energy consumption and energy consumption in forging heat treatment and forging production, accounting for about 30% ~ 30% of total energy consumption of the whole forging production.A large number of application examples show that the waste heat to make full use of the forging heat treatment, can kill two birds with one stone, the energy is saved, and shorten the process, at the same time also played an indirect protection to the environment.
Forging after hardening is refers to the forging forming, when the temperature is higher than Ar3 or Ar3 ~ Ar1 between a certain temperature, the quenching into proper quenching medium, obtain martensite and bainite structure of technological process.
Control points are:
1, stable and controllable heating system.Billet heating system for medium frequency induction heating, infrared thermometer and temperature of three-channel sorting system, it can easily control the heating temperature and sorting unqualified heating temperature of billet.
2, determine suitable quenching temperature and controlled effectively.Appropriate forging residual heat quenching temperature should be determined based on the test, in the actual operation can be controlled by forging heating temperature, residence time after forging, after forged residence time recommend carbon steel is not greater than 60 s, alloy steel are between 20 ~ 60 s.
Configure sorting system, infrared thermometer and temperature will be lower than quenching temperature forging sorting out;When forging heating temperature stability, forging process is stable when the configurable process time measurement and alarm system, reach the purpose of control the quenching temperature by controlling the process time.
3, good quenching system.On the premise of guarantee the quenching effect to choose slower cooling capacity of quenching medium, in order to prevent the severe quenching distortion and cracking.Due to the forging residual heat quenching temperature is higher than ordinary quenching temperature, so the forging good hardenability, so the carbon steel and alloy steel generally choose oil or PAG quenchant.
Quenching tank should have enough volume, controlled cooling time, also, quenching medium circulation, cooling system and heating device, quenching medium temperature automatic control, ventilation device.To strengthen the maintenance of quenching medium, regular testing cooling properties of quenching medium, cleaning tank and circulation system of impurities such as scale, maintain the cleanness of quenching medium.
4, tempering after quenching.Forgings can be put on hold after quenching time associated with forging materials, shape, and environment temperature, should be determined based on the test.To save energy and improve the utilization rate of tempering furnace, reducing energy consumption of heat preservation, the hardening of forgings in workshop focused on tempering heat treatment.
Forgings after forging residual heat quenching and tempering treatment, not only can obtain a better comprehensive mechanical properties, but also can save energy, simplify the technological process, shorten the production cycle, reduce the personnel demand and save the investment cost of heating furnace quenching, is an excellent technique.