The choice of bearing material

Choice of bearing material is designer according to the functional requirement of the working condition of bearing and bearing parts. Rolling bearing is mainly composed of ring, rolling body, cage and other parts, the parts material can be divided into: ( 1) Ring and roller materials; ( 2) Cage materials; ( 3) Other parts such as rivet, dust cover, seal etc. The above parts, variety of materials, due to their physical and chemical and mechanical properties of different, and each has different characteristics, to adapt to the work under various working conditions and environmental requirements. Bearing material choose appropriate or not directly related to whether meet the function and use requirement of institutions, on bearing performance and fatigue life has a decisive influence. Usually under the condition of material to choose the right, as long as cooperate with normal installation, lubrication and maintenance, bearing will achieve good working performance and reliability requirements. Here briefly describe bearing ring, rolling body and keep back the material application. 1. Ring and roller materials ( 1) Most of high carbon chromium bearing steel bearing ring and rolling body is made of special steel. With the high carbon chromium bearing steel ( GCr15 and GCr15SiMn ZGCr15 and ZGCr15SiMn) Make ring and rolling body, its parts hardness is as follows: made of GCr15 and ZGCr15 material ring and roller for HRc61 ~ 65, steel ball is HRc62 ~ 66; Made of GCr15SiMn and ZGCr15SiMn material ring and roller is HRc60 ~ 64, steel ball is HRc60 ~ 66. Made of high carbon chromium bearing steel bearing generally applicable to the working temperature for - Range of 40 ~ 130 degrees, oil and grease lubrication is normal. Can meet the requirements of general machinery. High carbon chromium bearing steel bearing parts after high temperature in fire, it adapt to the working temperature can be as high as 250 degrees. Along with the progress of the smelting technology, the high carbon chromium bearing steel smelting can adopt different methods, such as vacuum smelting technology can make the reform of the immanent quality of steel, the standard is the oxygen content in steel and the formation of the non-metallic inclusions has decreased significantly. Made of this kind of high carbon chromium bearing steel bearing, its fatigue life can growing exponentially. According to a large number of trials comparing data show that different smelting method for GCr15, GCr15SiMn, ZGCr15, ZGCr15SiMn bearing steel bearing. ( 2) Carburizing bearing steel made of carburizing bearing steel ring and rolling body, its hardness is: race and rolling elements is HRc60 ~ 64, the general optimum temperature for - and at work 40 ~ 140 degrees Celsius, oil and grease lubrication is normal, can be used in larger impact vibration conditions, such as locomotive and rolling mill bearing etc, but the steel heat treatment process is more complex. ( 3) Steel made of heat resistant bearing steel bearing ring rolling body, its hardness: ring and roller is HRc60 ~ 64, steel ball is HRc61 ~ 65, in the case of normal lubrication, is suitable for the working temperature is 120 ~ 250 degrees Celsius, such as aviation engine, gas turbine spindle working conditions. ( 4) Corrosion resistant bearing steel with corrosion resistant bearing steel manufacture ring and rolling body, its hardness is: race and rolling elements should not be lower than HRc58, suitable for the corrosive medium such as water, nitric acid, chemical reagents, temperature was minus From 253 to 350 degrees Celsius. 2. Cage materials ( 1) Most bearing adopts steel cage, the most widely used is low carbon steel plate stamping ribbon, basket, box, such as cage, is suitable for the use of high carbon chromium bearing steel bearing conditions and the environment; In carbon stainless steel plate stamping with cage is suitable for the corrosion resistance of the bearing steel bearing conditions and the environment. ( 2) With excellent non-ferrous metal smooth surface quality. Work under high temperature conditions, can use silicon bronze manufacture solid cage, working temperature can reach 315 degrees Celsius; Due to the strength of the aluminum is lower than brass, the proportion of light, and therefore commonly used aluminum and brass cage manufacturing entity, mainly is suitable for the higher speed, weight is lighter, corrosion resistance and other conditions. ( 3) Made of engineering plastic cage, and has great development in recent years, mainly because it has certain corrosion resistance, good self-lubricating performance, small friction resistance, use convenient, price cheap, easy in manufacturing, but easy to say 'ageing'. Currently the most widely used of reinforced nylon 66 was used in temperature range for - it can continue to work 40 ~ 120 degrees Celsius. Teflon high strength, lubricating, continuous working temperature can reach 300 degrees Celsius, phenolic adhesive has high mechanical strength, good abrasion resistance heat resistance, but this is expensive, suitable for high speed spinning around, working temperature for - 40 ~ 150 degrees Celsius, instantaneous can be as high as 180 degrees Celsius.