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2020
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05
The difference between cold-rolled springs and hot-rolled springs.
The main difference is in the production process, taking compressed springs as an example:
Typical process for hot-rolled springs: blanking --- end processing (flattening or forging) --- heating --- coiling --- quenching --- tempering --- end face grinding --- compression --- (load testing) --- shot peening (cleaning) --- coating.
Cold-rolled springs are made from materials that do not require heat treatment, with the process: coiling → stress relief annealing → end face grinding → (shot blasting), (straightening), (stress relief annealing) → setting or strong pressing treatment → inspection → surface anti-corrosion treatment.
Hot-rolled springs are mainly used for the coiling of large springs, and they are prone to distortion after heating, with lower resilience, requiring quenching and tempering after forming.
Cold-rolled springs are directly wound from spring steel wire, with greater resilience. The winding tool needs to consider the rebound compensation amount, and they are directly tempered after winding.
Difference: The main difference is the annealing time. In the production process, hot-rolled springs are coiled first and then annealed,
while cold-rolled springs are annealed first and then coiled. This is similar to the cold rolling and hot rolling of steel.
Note: Spring manufacturing methods
Cold-rolled spring manufacturing method: coiling → stress relief annealing → end face grinding → (shot blasting), (straightening), (stress relief annealing) → setting or strong pressing treatment → inspection → surface anti-corrosion treatment.
Hot-rolled spring manufacturing method: blanking → end processing (flattening or forging) → heating → coiling → quenching → tempering → end face grinding → compression → (load testing) → shot peening (cleaning) → coating.
Hot rolled springs, Xinglian Industrial, wire, springs, quenched steel wire
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