Slewming Bearing material type and working condition selection analysis

Slewing bearing as a key mechanical components , can withstand large axial , radial and tilting moments , the realization of the relative rotation of the mechanical structure of the movement , the performance of its performance directly affects the stability and reliability of the entire equipment .Slewing bearing material selection and the selection of different working condititons is to ensure its good performance of the important link !

First , Slewing Bearing material type

a. Bearing steel in gemeral , slewing bearing rolling body using the whole hardened carbon chrome bearing steel . GCr15 or GCr15SiMn steel manufacturing ; slewing bearing rings are sureface hardened steel , when the user has no special requirements , the general selection of 50 Mn steel manufacturing , but sometimes in order to meet the needs of the host of some special applications , but also according to the specific conditions of use provided by the user to choose other grades of surface-hardened steel , such as 42 CrMo , 5 CrMnMo and so on ,Bearing steel is one of the commonly used materials for slewing bearing ,with high hardness , high strength and good wear resistance .For example , the traditional GCr 15 bearing steel has a high carbon content , and after quenching and tempering, thhe hardness can reach about HRC60-65.Slewing bearings made of this material are suitable for light and medium load conditions in general industrial equipment , such as samll cranes and material handling

equipment.

Under these conditions , bearing steel slewing bearing can effectively withstand the radial and axial forces during the operation of the equipment , and maintain a low wear rate in the long -term use of the process, thus ensuring the accuracy and service life of the equipment .

(b) . Carburized steel

Carburized steel is mostly used for the surface hardness and heart toughness have special requirements of the slewing bearing , Like 20CrMnTi this kind of carburized steel , its carbon content is relatively low , after carburizing treatment , the surface of the formation of a layer of high carbon hardening layer ,the hardness is significantly improved , while the heart still maintains good toughness .This characteristic makes the carburized steel slewing bearing in the working conditions of the impact load performance , for example , in some engineering machinery walking mechanism, equipment running on the complex terrain will be subject to frequent impact and , to vibration , carburized steel slewing bearing to ensure the surface wear resistance at the same time , relying on the toughness of the heart to absorb the impact energy prevent the slewing bearing due to sudden overload and fracture failure , greatly improving the reliability of the equipment operation .The raliability of equipment operation is greatly improved .

(C) tempered steel

Tempered steel such as 42CrMoQT, 50MnQT, through the tempering treatment (quenching + high temperature tempering), has good overall mechanical properties, strength and toughness are more balanced. In some medium load and high dimensional stability requirements of the occasion is widely used, such as industrial robots joint parts, large cranes, material handling equipment. Industrial robots in the operation process, the slewing bearing needs to accurately control the rotation angle and position, the good overall performance of the tempered steel can ensure that the slewing bearing in the state of deformation of the force is small, so as to ensure that the robot's movement accuracy, and can withstand a certain period of the alternating load, to meet the demand for industrial robots to work continuously for a long time.

Second, different working conditions corresponding to the selection

(a) low-speed heavy-duty conditions in the mining machinery, large port cranes and other low-speed heavy-duty equipment, slewing bearings bear a huge axial, radial and tilting moment. At this time, should give priority to the material for high strength carburized steel or tempered steel slewing bearing, and combined with a larger diameter and number of rolling body, in order to improve the bearing capacity. For example, in the large ball mill slewing bearing selection, the use of carburized steel and equipped with a larger diameter of the steel ball as the rolling body, while increasing the number of rolling body columns, which can effectively disperse the load, reduce the contact stress between the rolling body and raceway, reduce the risk of wear and fatigue failure, to ensure that the equipment in a long time, under the conditions of the operation of the large load, stable and reliable work.

(ii) High-speed light load working conditions for some high-speed operation but the load is relatively light equipment, such as precision CNC machine tools rotary table, the slewing bearing precision and speed requirements are higher. It is appropriate to use bearing steel material slewing bearing, and the use of special cage design, such as phenolic laminated cloth tube cage or engineering plastic cage, in order to reduce the friction resistance and centrifugal force in high-speed rotation. This material and structure of the slewing bearing can meet the requirements of low friction and low heat generation when rotating at high speeds to ensure the rapid positioning accuracy of the rotary table and the stability of high speed operation, thus improving the machining efficiency and machining accuracy of CNC machine tools.

(C) strong corrosive environment conditions in the chemical equipment, marine engineering equipment and other equipment in a strong corrosive environment in the application of the scene, the slewing bearing is faced with severe corrosion challenges. Need to choose materials with good corrosion resistance, such as stainless steel material slewing bearing. For example, in the yaw and pitch slewing bearing of the offshore wind turbine, due to long-term exposure to the marine atmosphere, by seawater droplets, salt spray, etc., the use of 316 stainless steel material can effectively resist the corrosion of chlorine ions and other corrosive mediums, to prevent the slewing bearing of the raceway, rolling body and seals and other parts of the corrosion, to prolong the service life of slewing bearings, to ensure that the wind generator is stable and operational under the adverse Ensure the stable operation of the wind turbine in the harsh marine environment.

(D) high-temperature conditions in the metallurgical industry, continuous casting equipment, heat treatment furnace and other high-temperature working environment of the equipment, slewing bearing to withstand high-temperature radiation and heat conduction brought about by the heat. At this time should be used in high temperature materials and special lubrication and sealing system. For example, the use of high-temperature bearing steel such as Cr4Mo4V production slewing bearing, and equipped with high-temperature lubricating grease, at the same time, the use of metal seals or special high-temperature rubber seals to prevent lubricant loss at high temperatures and external impurities into the internal slewing bearing. Such selection can ensure the normal operation of the slewing bearing in the high temperature environment, to maintain the continuous production of the equipment, reduce the downtime and maintenance costs caused by equipment failure.

Slewing bearing material types, different materials have their own unique performance advantages. In practical application, we must fully consider the specific working conditions of the equipment, including load size, speed, environmental corrosion and temperature and other factors, a reasonable choice of slewing bearing materials and models, in order to ensure that the slewing bearing in a variety of working conditions can be stable, efficient and reliable operation, which in turn protects the normal operation of the entire machinery and equipment system and service life, improve production efficiency and reduce maintenance costs. Costs. If you need support in slewing bearing selection or technology, you can contact us at any time, Jessica will use 20 years of professional technology and service to provide you with services.