Research on wind power bearing quenching tempering temperature


Yaw , inside and outer ferrule pitch wind 42CrMo steel bearings are used as raw materials . Because wind power bearing the special conditions of service , users of its low temperature impact energy and room temperature mechanical properties of increasingly demanding. Low temperature impact energy and wind power is to determine the mechanical properties of the bearing life and reliability of key performance indicators , wind power bearing rings transfer of heat treatment process parameters is one of the important factors affecting them .

To further improve the low temperature impact energy and wind power bearing room temperature mechanical properties , in-depth study of the quenching and tempering temperature quenching wind power bearing on its impact on the law . Using four different quenching process ( quenching temperature , respectively: 800,820,840 and 860 ℃) and five different tempering temperature (570,590,610,630,650 ℃) composed of 20 kinds of quenching process The test sample loop test. Quenching time is 2 to 3 hours , the medium is a liquid polymer , the concentration of 2% to 5% ; tempering time is 4 ~ 6 hours . Quality Process swap after sample loop and low temperature impact energy at room temperature mechanical properties testing, sampling the circumferential direction of the ring -like sampling location is kind of the end surface of the pitch circle at the end face of 12.5mm . By comparing the test data set , access to the wind power bearing rings quenched ideal process parameters.

Experimental results show that :

1 ) Under the same circumstances tempering temperature , with the quenching temperature , quenched specimen cryogenic impact energy also increases, but when the quenching temperature exceeds 840 ℃ , the low-temperature impact energy decreased. This is because as the quenching temperature, the original organization more ferrite dissolved in austenite , martensite content of more after quenching and tempering tempered sorbite structure obtained after the more , the less undissolved ferrite , so the higher the impact energy . However, when the quenching temperature exceeds 840 ℃ , the original organization of the ferrite has dissolved, addition of another quenching temperature , austenite grain coarsening will cause coarse martensite after quenching , and tempering the resulting get thick tempered sorbite tissue , resulting in lower impact energy . Thus , in the actual production during the development of wind power bearing forging quenching process , the use of a concentration of 2 % to 5 % of the polymer agent as quenching medium , quenching temperature should not exceed 840 ℃.

2 ) Under the same circumstances quenching temperature , with the tempering temperature , low temperature quenched samples also increases the impact energy , but high tempering temperature will result in reduced strength and hardness , therefore, the actual production of the development of wind power bearing forging quenching process , should consider the impact on the forging and tempering temperature strength and hardness .

3 ) When the tempering temperature is the same, with the quenching temperature, the strength and hardness of the steel increases .

4 ) When the quenching temperature is the same, the higher the tempering temperature, the strength and hardness of the steel decreases, increased ductility and toughness .

5 ) Considering the wind power bearing rings quenching quenching , tempering temperature on the mechanical properties of low power and influence of the impact , determine the wind power bearing rings ideal transfer of heat treatment process parameters are as follows : quenching temperature of 840 ℃ + / - 10 ℃; tempering heating temperature of 630 ℃ + / -10 ℃; quenching medium is 2% to 5% polymer agent.

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