preload preload preload preload

Heat treatment technology with bearing material

31st October 2008 Bearing Technology 0 Comments

Heat treatment technology with bearing material:

Mainly show in several following respects: Research of the basic theory of the heat treatment; Research of heat treatment craft and application technology; And the development of correlation technique is equipped in the new heat treatment. The heat treatment quality control of the part of the bearing is that the strictest bearing heat treatment made very great progress during 20 the coming years in the past in the whole mechanical trade.

: A high-carbon chromium bearing steel is annealed

Quench the flash back to make and organize preparing for cold working and final one for the future. The conservative ball annealed craft is slightly higher than Ac1 temperature 780~810 ℃ such as GCr15 Keep warm, up to the cooling 25 ℃/ h makes emptily coldly to under 650 ℃ slowly of stove. The heat treatment time of this craft is long Above 20h [1]And the particle irregularity of carbide after being annealed, cold working and final quenching flash back organization and performance after influencing. Later, according to the intersection of subcooling and the intersection of and the intersection of transition and characteristic of body, the intersection of person who develop and Qiu annealed craft Wen: It will be soon cold in a certain temperature range under Ar1 after heating 690~720 ℃ It is warm to go on etc., wait for and finish body to transform in the warm course into ferrite and carbide, can make directly emptily coldly after changing and finishing. The advantage of this craft is to save the time whole craft about 12~18h of heat treatment, it is for obtaining the organization of carbide particle with detailed uniform distribution, with even, round filial piety on matrice of ferrite that the ball of the high-carbon chromium bearing steel is annealed. The carbide in organization after handling is tiny and even. Another kind of craft of saving time is to repeat the ball annealedly: Heat after 810 ℃ to cool to 650 ℃ for the first time, and then heat after 790 ℃ to cool to 650 ℃ and make emptily coldly. Although this craft can save regular hour, craft operation is relatively in great numbers.

The body of horse of 2 high-carbon chromium bearing steels quenches the flash back

2.1 Convention horse’s body quenches tempered tissue and performance

The body of horse of the high-carbon chromium bearing steel of the convention quenches the development of the flash back craft to mainly divide into two respects: On one hand quench the impact on organization and performance of technological parameter of flash back, have neared over the past 20 years. The organization substantially as quenching in the course of flash back changes, surplus resolving, toughness and tired performance after quenching the flash back of the body,etc. [2~10 ] on the other hand quench tempered processing property, influence, size stability substantially as quenching the condition to the size and out of shape,etc. [11~13]

Horse’s tissue shape of the body can be divided into two kinds: Under the metallography microscope Enlarge the multiple and is generally lower than 1000 times Horse’s body can be divided into lath horse body and flaky horse’s two kinds of models of body to organize, the tissue after convention horse’s body is quenched has and not dissolved for horse body, surplus body Remain The carbide makes up. Among them. It is the lath and flaky horse’s mixing tissue of the body, or the middle shape

  • Leave a Reply

    * Required
    ** Your Email is never shared