SKF deep groove ball bearing heat treatment process of casting methods and indicators

With the development of science and technology, machine tool spindle speed is more and more high, speed range is more and more big, therefore, is becoming more and more high to the requirement of bearing high speed stability. SKF bearing temperature rise is an important factor to limit bearing rotating speed. Typically, correct selection of deep groove ball bearing type and tolerance grade, the configuration way, clearance ( Pre-load) , lubricants and lubrication method, such as size, can to a certain extent, improve the high speed performance of rolling bearings. For general machine tools, the life of the spindle components is mainly refers to the use of the term to keep the spindle precision, therefore, requires SKF bearing accuracy to maintain performance meet the requirements of the spindle component life. For heavy duty machine tools or strong cutting machine, should first consider the bearing capacity of the deep groove ball bearings. Deep groove ball bearings make precision parts, thus a prudent attitude when use requirements accordingly, both using the high performance SKF bearing, if use undeserved, also cannot achieve the expected performance effect, so the use of bearing that should be paid attention to the following matters. ( 1) The dehydrogenation process. Deep groove ball bearings after different heat treatment process. After carbonitriding, hydrogen embrittlement, reduction of area of bearing steel is very low, dehydrogenation, workpiece performance recovery, the hydrogen embrittlement is no longer present after quenching workpiece defect again. ( 2) Deep groove ball bearing low temperature tempering dehydrogenation. With the extension of tempering time, reduction of area increase, reduction of area to restore the original after tempering 8 h level; In addition, hot rolling microstructure of exhalation hydrogen slower, hydrogen embrittlement is related to the original organization. ( 3) Natural aging dehydrogenation. Hydrogen artifacts placed at room temperature, hydrogen supersaturated precipitation gradually release, the hydrogen embrittlement hazard loss. Artifacts from two different processing status, the reduction of area 3 months and 6 months after recovery, you can see, normalizing state resumed rapidly, a reasonable recovery; 3 months Hot rolled state of reduction of area recovered after 6 months. This method shows that the natural aging eliminate hydrogen embrittlement effect is significant.