Slewing bearings, also called slewing bearings, are often used in engineering and manufacturing machinery, such as excavators, roadheaders, wind power equipment, industrial robots, port machinery and other equipment. Slewing bearings are usually composed of ferrules, rolling elements, cages, and sealing rings. Because different parts have special functions in practical applications, there are different considerations in the design and selection of materials. Today I will tell you what are the commonly used materials for slewing bearings.
One,Materials for gear ring and rolling element
In general, the rolling elements of the slewing ring adopt integrally hardened carbon-chromium bearing steel. The grade is made of GCr15 or GCr15SiMn steel; the slewing ring is made of surface hardened steel. When the user has no special requirements, it is generally made of 50Mn steel, but sometimes in order to meet the needs of the host in some special applications, it can also be provided by the user. For specific use conditions, select other grades of surface hardened steel, such as 42CrMo, 5CrMnMo, etc.
The medium and small slewing bearing forgings all use round or square bars as blanks. The grain structure and mechanical properties of the bar are uniform and good, the shape and size are accurate, and the surface quality is good, which is convenient for mass production. As long as the heating temperature and deformation conditions are reasonably controlled, forgings with excellent properties can be forged without large forging deformation. Ingots are only used for large forgings. The ingot is a cast structure with large columnar crystals and a loose center. Therefore, it is necessary to break the columnar crystals into fine grains through large plastic deformation, and compact the looseness to obtain excellent metal structure and mechanical properties.
Two. Material for cage
The cage for slewing support has a structure such as an integral type, a segmented type, and a spacer type. One-piece and segmented retention
The frame is made of No. 20 steel or ZL102 cast aluminum alloy. The isolation block is made of polyamide 1010 resin and ZL102 cast aluminum alloy. In recent years, with the continuous development of the material industry, nylon GRPA66.25 has also been promoted and applied in the design of segmented cages.
Common materials for slewing bearings
Three. Materials for sealing ring
The slewing ring is made of oil-resistant nitrile rubber, oil-resistant rubber and fluorine rubber. The material used for the seal must be able to withstand a large operating temperature range and have a certain chemical resistance.
The code of the ferrule material and the supply status of the blank shall be as specified in the table. In the table, “T” means that the ferrule blank is supplied in a quenched and tempered state, and “Z” means that the ferrule blank is supplied in a normalized state.
code number 01 02 03 04 05 06.
Material and blank state 45BT 45BZ 42CrMoT 42CrMoZ 5CrMnMoT 5CrMnMoZ.
code name 07 08 09 10 11 12.
“Material and blank state 42SiMnT 42SiMnZ 45MnT 45MnZ 50MnT 50MnZ.
The diameter of the center circle of the rolling element is 3150mm, the ball diameter is 75mm, the gear modulus m=20mm, the ring material is 50Mn, and the blank material is normalized. The internal tooth type four-point contact ball will be transferred to the bearing expressed as 013.75.3150.12 .
The above is a brief introduction to the commonly used materials of slewing bearings. Luoyang Hengguan is a comprehensive entity enterprise of slewing ring/slewing table bearings integrating design, R&D, production, sales and service. Mainly produce slewing ring/slewing table bearings with a diameter of 50-9800mm and various high-precision slewing bearings, large thrust ball bearings, non-standard shaped bearings and other products. The accuracy covers four levels of P0, P6, P5, and P4. The product types include single-row Four-point contact ball structure, cross cylindrical roller structure, three-row cylindrical roller structure, double-row ball slewing ring, ball-column joint structure, thin-walled flange structure, large thrust ball structure, etc. Friends in need are welcome to call for detailed consultation.