RKB ROLLERS PRODUCTION FLOW CHART DESCRIPTION0 pages

RKB ROLLERS PRODUCTION FLOW CHART
DESCRIPTION
1. SELECTION PROCESS
The very first step of the production flow chart for the rollers consists in the purchase of the steel bars,
which takes place according to RKB technical specifications and procedures.
Depending on the typology of rollers that are in production, and on the related drawings, the steel
gets selected.
The bars are cut or sawed into sections. Afterwards, they will proceed to a quality check aimed to
identify the eligible ones for turning process.
2. TURNING PROCESS
The sections are arranged for turning process whereby they get turned on a lathe (CNC lathe or
universal lathe) leaving well defined allowances. All the related technical specification get checked,
after which the turned rollers proceed to heat treatment.
3. HEAT TREATMENT PROCESS
In function of the typology of product required and based on the category of steel, there are two
different types of heat treatment. The bearing standard through hardening steel undergoes the
related treatment. Carburizing steel, first of all, undergoes to carburizing process, gets checked, and
then goes through hardening treatment. Following the hardening treatment, they undergo to
tempering treatment, a further quality check and then they endure grinding process.
4. GRINDING PROCESS
The hardened rollers go through rough grinding process and quality check. Subsequently, the next
step is the finishing grinding process. All technical specification get checked and the eligible semifinished
rollers are sent to demagnetization.
5. FINAL PHASE
The rollers undergo the polishing process, get checked and then sorted for allocation in graded
batches in function of the dimensions and of the tolerances. The rollers are now ready for matching
with the bearings’ rings.