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What material is good for Slewing Ring Bearing


The material of the Slewing Ring Bearing directly determines the performance and service life of the bearing. At present, most of the bearing main structure materials on the market are bearing steel, which has corrosion resistance and stability. Of course, in addition to bearing steel, aluminum alloy, copper and other metal materials are often used. In addition, the sealing ring and cage of the bearing may be different from the bearing body material. The following Zhiyuan Slewing Ring Bearing factory tells you what material needs to be selected for the Slewing Ring Bearing.


What material is good for Slewing Ring Bearing


a. What material is good for the Slewing Ring Bearing


1. Ring and roller material


In the early stage, 45# steel was selected for the Slewing Ring Bearing, which was gradually eliminated in the later stage due to poor modulation performance. In a typical machining process at present, solid carbon-chromium bearing steel is used as a whole for the Slewing Ring Bearing rollers. Manufactured from grade GCr15 or GCr15SiMn steel; cover of Slewing Ring Bearing is made of case hardened steel, no special requirements, made of 50Mn steel. But sometimes customers choose to customize other license plates, such as 42CrMo, 40Cr, etc. The characteristics of these grades of steel are described below.


(1) 42CrMo is a high carbon steel with good adjustment performance and quenching performance, and is an ideal material for Slewing Ring Bearings.


(2) 50Mn is hardenable and is an excellent choice for Slewing Ring Bearings.


(3) 40Cr is also very good in mechanical properties, and it is still in the stage of exploration and practice.


(4) GCr15 small Slewing Ring Bearing can be selected, but milling and drilling are difficult due to special fire in the process, so it is generally not recommended.


2. Frame material


The cage for the Slewing Ring Bearing has the structure of the whole, the segment and the separation block. The material types of the cage include mild steel stainless steel cage, rubber tree/plastic (nylon) cage, brass/bronze/aluminum alloy cage, etc., and the separation block is made of polyamide 1010 resin, ZL102 cast aluminum alloy, etc.


The characteristics of bearing cages of various materials are as follows:


(1) Steel bearing cage: 08 and 10 carbon steel sheets are often cold stamped. Commonly used steel cage materials include 20, 30, 45, 0Cr18Ni9, 1Cr18Ni9Ti, 40CrNiMo, ML15 and ML20, etc. Bearing cage commonly used material selection, sturdy and durable.


(2) Non-ferrous metal bearing cage: Different from steel, non-ferrous metal has special characteristics such as low density, good thermal conductivity and good corrosion resistance of aluminum alloy. Copper alloy has the characteristics of good thermal conductivity, small friction coefficient, good formability and high service temperature. Zinc-aluminum alloy has the advantages of low cost, low density and good performance.


(3) Non-metallic cages: Non-metallic cage materials are mainly composed of polymers and their composite materials, including nylon, phenolic tape, PTFE, etc. The strength and elasticity of polymer materials are well matched, which can effectively reduce bearing heating and wear. Slewing Ring Bearing


3. Sealing material


The materials used for bearing seals are usually commonly used sealing materials, mainly including nitrile rubber, silicone rubber, bromo rubber, ternary ethylene, butylalanine rubber, PTFE, polyurethane rubber, acrylic rubber, anaerobic adhesives, etc.


The Slewing Ring Bearing seal is made of oil-resistant rubber material or NBR clear rubber material. Hydrogenated nitrile rubber has better oil resistance than nitrile rubber, but if oil resistance requirements are not too severe, use nitrile rubber. Because hydrogenated nitrile rubber is more expensive. Nitrile adhesives also have a certain acid and alkali resistance. However, if the requirements for oil and acid and alkali resistance are high, silicon should be selected, but the price is high.


b. Selection method of Slewing Ring Bearing material


Based on the current level of Slewing Ring Bearing production technology, the materials used in Slewing Ring Bearings are analyzed. It is recommended to consider the materials of bearing rings, rolling elements, cages, and sealing rings as follows:


1. Roll material: The main body of the roll is generally GCr15SiMn.


2. Ring material: 50Mn is selected for the turntable bearing cover, but sometimes 42CrMo is selected to meet the needs of the host for special applications.


3. Frame Textures: Frame styles are "All", "Segmented", "Split Block" and other structural styles. Integral or segmented grippers use 20# steel or ZL102 cast aluminum alloy. The separation block holder uses polyamide 1010 resin, ZL102 cast aluminum alloy or QA110-3-1.5 aluminum bronze.


4. Seal ring material: The Slewing Ring Bearing should be sealed with oil-resistant rubber, fluororubber, and oil-resistant denim rubber. The clearance of the Slewing Ring Bearing is mainly used to compensate the manufacturing and installation errors of the Slewing Ring Bearing supporting parts and the relevant host parts to ensure the normal use of the bearing. The clearance value or amount of interference of the Slewing Ring Bearing, depending on the construction style/tolerance class of the Slewing Ring Bearing and the pitch diameter of the rolling element set.


What material is good for Slewing Ring Bearing


The above is the introduction of good materials for Slewing Ring Bearings by Slewing Ring Bearing manufacturers. The bearing materials mentioned above are suitable for Slewing Ring Bearings, and the specific use environment and performance requirements may have different requirements for bearing materials. Please choose according to the actual situation. In addition, Zhiyuan factory also produces various types and specifications of precision turntable bearings, rotary drives, spur gear drives and other products. If you have any other questions, please contact us.