Our
dedicated sales team identify your specific requirements and select the
appropriate specification sheet, of which thousands are kept in our
technical library. This is issued to the production team as a job card,
specification job cards always contain a unique job reference number
enabling total traceability throughout the entire manufacturing process.
Spring
steel to grade 251 A58 (EN45A) is sheared to the length required by the
specification and processed through the required manufacturing
operations, including eye forming, drilling, punching, and wrapping.
The
leaves are then passed to heat treatment (1,000 - 1,050°C), shaped and
oil quenched to give a quenching temperature of no less than 890°C.
After draining, they are tempered at 500 - 560°C to give the correct
hardness before final adjustment to give correct shape and camber.
On
the final assembly line, the required components are added, i.e.
bushes, clips, centre bolts, etc. to complete the spring, which is again
checked against the specification sheet. The spring is then either
painted or finished to the customer's requirements.