China Clutch Belt Kit

The workpiece is heated to 20-40°C above the temperature at which the steel begins to form austenite, and then slowly cooled after holding the temperature.. and the residual stress in the casting. If they are not tempered in time, they will tend to deform or even crack. Adjust the mechanical properties of the workpiece. It is used to refine the coarse superheated structure of poor mechanical properties after casting, forging and welding of medium and low carbon steel. The hardness after tempering is generallyWholesale INA Bearings Manufacturers HB200-330.Those with a little mechanical knowledge should know that heat treatment is the soul that imparts the inherent quality of machinery. The heat treatment process generally includes three processes of heating, heat preservation and cooling, sometimes only two processes of heating and cooling. For some low- and medium-carbon alloy steels used in steam turbines and boilers, normalizing is often used to obtain bainite structure, and then after high temperature tempering, it has good creep resistance when used at 400-550℃. Stress relief annealing. Common annealing processes are: Completely annealed. For iron and steel products, the temperature at which austenite begins to form after heating is 100 to 200°C, and the inteal stress can be eliminated by cooling in air after heat preservation. This phenomenon is called secondary hardening. Low temperature tempering: 150-250°C, M cycle, reduce inteal stress and brittleness, improve plastic toughness, have higher hardness and wear resistance. The holding time for stress relief annealing of castings is taken as the upper limit, and the cooling rate is controlled at (20-50) ℃/h, and it can be air-cooled after cooling to below 300 ℃.  ,Wholesale INA Bearings Manufacturers ...ادامه مطلب

Whether there is noise: Hold the inner sleeve of the bearing with your left hand, and tu the sleeve with your right hand to listen to whether there is any noise. The fonts are very small, but most of the products produced by the factory use steel stamping technology, and they are pressed before heat treatment. If you really can’t distinguish the sound, use a sound meter to check the size and sound quality of the rolling sound of the running imported bearing. Packaging Look at whether the outer packaging is clear: Under normal circumstances, the brand has its own dedicated designers to design the outer packaging, and arrange for production in factories that pass the production conditions, so the packaging is very clear from the lines to the color blocks. Due to the backward production conditions of most counterfeit products and the completely hand-made workshop operation, it is inevitable that impurities such as sand will be mixed in the bearing body during the production process, so noise will be generated when rotating. Even if the bearing is slightly damaged such as peeling, it will emit abnormal and irregular sounds. will be printed on the bearing body. Therefore, although the fonts are small, they are deeply concave and very clear. Due to the rough printing technology, the fonts float on the surface, and some of them can even be easily erased by hand. Able to distinguish. Anti-rust oil Whether there are turbid oil stains on the surface: This should be paid special attention to when purchasing imported bearings. Steel seal Wheel Bearings suppliers Whether the stamping is clear: Brand words, labels, etc. Since the current domestic anti-rust technology is not very popular, it is easy to leave thick oil stains when anti-rust treatment on the bearing body, which is sticky and sticky in the hand, while it is almost invisible on the original imported bearings from abroad. vague. Due to the limitation of production technology, the counterfeit bearings are no,Wheel Bearings suppliers ...ادامه مطلب