230.20.0400.503 slewing bearing 518x304x56 mm without teeth for material handle

230.20.0400.503 slewing bearing 518x304x56 mm without teeth for material handle

230.20.0400.503 Single row four-point contact ball slewing bearings
230.20.0400.503 Slewing bearing with internal gear ,518x304x56 mm, JBT10471 quality Standard
Dimensions - d (inside diameter) 304 mm
Dimensions - D (outside diameter) 518 mm
Dimensions - B (width) 56 mm

Heat treatment
3.1 Raceway surface quenching: The bearing raceway surface is quenched at medium frequency, the hardness is not less than 55HRC, the depth of the hardened layer is not less than 4mm, the width of the soft belt is less than 50mm, and the "S" mark is marked accordingly. (Sometimes customers can request carburizing, nitriding, carbonitriding, etc.)
3.2 Tempering after heat treatment: After the intermediate frequency quenching of the inner and outer rings of the bearing, it is required to be exposed to 200C degrees for 48 hours before being baked. To ensure that internal stresses disappear.
Rolling and milling processing—4.1 For turntable bearings with internal and external teeth, the grinding and milling teeth must be carried out before the grinding process, and they must be processed in strict accordance with the technological requirements, with an accuracy level of 8 or more.
5) Drilling—
5.1 Scribing: After measuring the external dimensions of the part, carry out the scribing and positioning procedures according to the dimensions specified in the drawing. The holes should not differ from each other by more than 3%.
5.2 Drilling: Check the scribe line size according to the drawing, and then perform the drilling process after ensuring that the dimensions are correct. The inner sleeve turntable bearing mounting holes should be combined and processed, and the error between the holes at 180C degrees between the soft belts should not be greater than 5%.
06) Grinding
6.1 Coarse grinding: Use medium corundum and soft three-grained granularity of 36 degrees and atmospheric hole resin grinding wheels for grinding. The line speed is controlled at 1500 rpm to prevent raceway burns. The maximum grinding depth must not exceed 1 mm.
6.2 Fine grinding: Use resin wheel grinding with a granularity of 46 degrees or 60 degrees, the grinding amount should be less than that of rough grinding, and the finish must reach the level specified in the drawing

 
Generally, only the raceways in the rings are hardened and precision- ground. Integral seals  made of acrylonitrile- butadiene rubber (NBR) keep the lubricant in, and contaminants out of the bearing.

230.20.0400.503 Slewing bearings perform extremely well in a variety of applications such as:

• bucket wheel excavators
• conveyor booms
• cranes of all types
• small, medium and large excavators
• indexing tables
• ladle turrets
• offshore applications
• robots
• railway bogies
• rotary platforms
• stackers
• solar mirrors
• tunnel boring machines
• wind turbines

   Slewing bearing is one of our main products.
1. four point contact ball slewing bearing (no gear, external gear, internal gear);
2. two row ball slewing bearing (no gear, external gear, internal gear);
3. crossed cylindrical roller slewing bearing;(no gear, external gear, internal gear);
4. three row cylindrical roller slewing bearing;(no gear, external gear, internal gear);
5. crossed tapered roller slewing bearing; (no gear, external gear, internal gear);
6. ball and roller combined slewing bearing.(no gear, external gear, internal gear);