Two production methods of hardware spring

Hardware springs are required to have sufficient hardness and elasticity, to withstand large loads and impacts, and to adapt to high-temperature, high-speed and harsh working environments. The production method can be divided into two types: cold rolling method and hot rolling method. Generally speaking, when the diameter of the metal spring wire is smaller than

For 8 mm, use the cold rolling method. The spring coiled in the cold state is usually cold-drawn and pre-heated high-quality carbon spring steel wire. After coiling, it is generally no longer quenched, and only needs to be tempered at low temperature to eliminate the internal stress during coiling.

And the hardware spring is greater than 8

For

mm, the hot rolling method is used. Springs rolled in a hot state must be quenched and tempered at a medium temperature after being rolled. Some hardware shrapnels need to be subjected to strong pressure or shot peening after they are made, which can improve the load-bearing capacity of the hardware shrapnels.