Production Technology Flow
LDB’slewing bearing strictly enforced in accordance with the process of production and quality standards, each link has a rigorous quality control. 100% inspection of manufactured products, each product has a unique product number, to ensure product traceability.
01. Raw Materials
All our raw materials 50Mn, 42CrMo and 42CrMo4 sourced from Daye Speical Steel Co.,Ltd, Xingcheng Steel; Magang (Group) Holding Co.,Ltd.
02. Raw Material Forging+Normalizing/Quenching and tempering
After Q&T, the forgings’comprehensive mechanical properties could be improved，
03. Rough Turning
After rough turning, boundary dimension must be inspected to ensure dimensions within scope of dimension processing technology.
04. Hardness Test
The hardness of Normalizing range HB187-241.The hardness of Quenching and tempering range HB229-269.
05. Ultrasonic Testing
Using UT to test if the forgings have inner defect
Finish turning and shaping before raceway quenching.
07. Raceway Quenching
08. Raceway Surface Hardness Test
After raceway hardening, LDB Slewing bearing’s raceway surface hardness will range HRC55 -60
09. Raceway Hardening Layern Depth Test
After raceway hardening, Hardened hardness layer depth larger than 3mm.
10. Raceway Fluorescent Magnetic Particle Flaw Detection
The raceway is tested for cracks after quenching
11. Stable and Tempering
Release the internal stress, make the material structure more stable
12. Finish Turning
Finish turning after quenching
13. Tooth Maching
Use CNC hobbing machine/gear shaper to make gear according to process requirements
14. Gear Hardening
After gear hardening, its surface hardness will reach to 45-55HRC.
15. Gear Test
Check the size and precision of tooth profile, meet the process requirements
16. Hole Machining
Use machining center or other machine tools for hole machining according to the process to ensure the accuracy of hole position
17. Hole Inspection
Inspection items include: hole diameter,chord length and centeral diameter.
18. Matching Clearance
Machining the raceways of two sets of rings with processing, to ensure that the clearance of slewing bearing within the process requirements.
Workers removing burrs after ferrule overall cleaning. They put in strict accordance with the requirements of the drawings rings, rolling elements, spacers and seals assembled. After checking the appearance of the finished product assembled again until perfect.
20. Inspection for Finished Products
The inspection items include clerance, runout, appearance and rotation flexibity.
The finished slewing bearings need to have factory mark and product Serial No.,our company also supply OEM service and neutral product.
Standard export packing: Plastic film,kraft paper and nylon wraping belt.Product outer label,Qualified certificate,Assemling & maintenance manual and free funigation plywood case.