Non-standard bearing steel smelting appearance inspection and organizational requirements

Non-standard bearing steel smelting appearance inspection and organizational requirements source: bearing | last updated: - 2020 09 - 23 of non-standard bearing steel smelting has strict macrostructure and microstructure ( At high magnification) Organizations require non-standard bearing steel macrostructure is refers to the general loose, loose and flat center, microscopy ( At high magnification) Organizations including steel annealing, carbide mesh, strip and liquid chromatography. The dangers of carbide liquid chromatography were hard and brittle, it is the same as the brittle inclusion. Carbide network to reduce the impact toughness of steel, and made it the organization is not uniform, easy to deformation and cracking during quenching. Banded carbide annealing and quenching tempering and contact fatigue strength. Low and high power quality for performance and service life of rolling non-standard bearing has a great influence, so in the non-standard bearing material standard have strict requirements on low and high power organization. The appearance of the non-standard bearings how to check 1, all kinds of machinery, such as abrasion, cut and bruised, crushed, can cause adverse bearing installation, causing partial load and stress concentration, falling rotating precision and service life. 2, rust, black and pitting, the latter two are easy to store water and dirt of defects, most likely to develop into rust. The corrosion is caused pollution sources, the installation of non-performing, early wear and fatigue serious corrosion will make the bearing damaged. 3, all kinds of crack, crack, such as raw materials, forging, heat treatment of crack crack and grinding cracks, the crack in the process of bearing after operation, will become a source of stress concentration and is expanding fast, cause bearing is broken, and great influence on bearing life and job security. In fact, for important use of bearings, bearing factory has been to 100% of their component parts magnetic or radiographic inspection. 4, peeling and folding, the two defects of local combined with matrix metal not firm, and its surroundings often exist in different degrees decarburization or poor phenomenon, carbon material easy caving, the indented or wear, bearing life and accuracy very unfavorable. 5, maintains a riveting or welding quality, mainly to see whether it has offset the rivet head, skew, relaxation, lack of meat, or 'double eyelid, correct the position of the welding, solder joint is too big or too small, for welding not firm or excessive cause jam phenomenon of roller.