Slewing bearing is a very important transmission part of mechanical equipment, it is composed of inner and outer rings, rolling body, etc., toothless, outer and inner toothed four-point contact ball bearing, double row angular contact ball bearing cross cylindrical roller bearing, cross tapered roller bearing and three row cylindrical roller compound bearing four series. What are the commonly used materials of slewing bearing? Let's find out.
1. Materials for ring and rolling body
In general, the slewed bearing roller is made of integral hardened carbon chromium bearing steel. Made of GCr15 or GCr15SiMn steel; The slewing-bearing ring is made of surface hardened steel. When the user has no special requirements, 50Mn steel is generally selected. But sometimes, in order to meet the needs of the main engine in some special applications, other grades of surface hardened steel, such as 42CrMo, can also be selected according to the specific use conditions provided by the user.
2. Cage materials
The cage used for slewing support has the structure of integral, segmented, isolated block and so on. The integral and segmental cages are made of No. 20 steel or ethyl L 102 cast aluminum alloy. Isolation block type using polyamide 1010 resin, ZL 102 casting aluminum alloy manufacturing. In recent years, with the continuous development of the material industry, nylon GRPA66.25 has been widely used in the design of sectionalized cages.
3. Sealing ring material
Rotary bearing sealing ring is made of oil-resistant J eye rubber. Code of ferrule material and blank supply state according to the table, "T" in the table means the ferrule blank is supplied in conditioning state," Z "means the ferrule blank is supplied in normalizing state. The central circle diameter of the rolling body is 3150mm, the ball diameter is 75mm, the gear module m=20mm, the ring material is 50Mn, the blank material is normalizing state of internal gear type four-point contact ball rotary bearing is expressed as 013.753150.12.
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