Bearings are used for automobiles, sliding bearings are mainly used in engines. rolling bearings are widely used in various mechanical and electrical assemblies in automobiles. There are many types of rolling bearings, but they are generally composed of outer sleeves, inner sleeves, rolling elements (steel balls, rollers, needles) and cages.
The bearing rings and rolling elements of rolling bearings are generally made of high-purity special chromium alloy steel, mainly GCr15 steel and GCr15SiMn steel, of which GCr15 steel is used the most. Rolling bearings are mostly in service under concentrated, high load, alternating stress, and high speed. The main forms of its failure are fatigue and wear.
Heat treatment technology plays a vital role in improving the internal quality of rolling bearings and prolonging their service life. Taking specifications and models: TM6305, TM6205, TM6206, TM6207 and other such bearings as examples, the main production process flow is as follows:
1.Outer Ring Processing
Raw material (bearing steel bars) blanking → spheroidizing annealing → forging (hot forging or high-speed forging) → ultra-fine processing → rough turning → finishing turning → strengthening heat treatment → shot blasting → rough grinding of double ends → centerless grinding grinding → coarse grinding of outer groove → additional tempering → cryogenic treatment → double end face fine grinding → centerless grinding of fine grinding → fine grinding of outer groove → fine grinding of outer groove → part final inspection → marking and parts cleaning.
2.Inner Ring Processing
Raw material (bearing steel bars) blanking → spheroidizing annealing → forging (hot forging or high-speed forging) → ultra-fine processing → rough turning → finishing turning → strengthening heat treatment → shot blasting → rough grinding of double end faces → centerless grinding grinding → rough grinding of the inner groove → rough grinding of the inner hole → supplementary tempering → cryogenic treatment → double end face fine grinding → fine grinding of the inner groove → fine grinding of the inner hole → fine grinding of the inner groove → parts cleaning.
3.Assembly (Inner Ring, Outer Ring, Steel Ball, Cage)
Fitting → riveting → finished product demagnetization cleaning → full inspection vibration value → full inspection clearance → full size, appearance inspection → anti-rust packaging.
