Heavy duty springs usually refers to a spring with diameter greater than 20mm. This springs commonly used in heavy machinery industry, such as construction equipments, mining equipments, agricultural equipments, railway vehicle, heavy roadway vehicle, shipbuilding industry etc.
As the wire diameter is bigger than 20mm, the forming force is overload for the cold coiling springs forming machine. It must be uesd hot coiling line to produce. The hot coiling line will heat the wire to 200-300℃, then put it to a coiling machine. The coiling machine control the diameter and pitch of springs with coiling draft. After coiling, the springs should cold by water or oil, and grinding the end according the drawings.
As a designated spring products supplier by the Chinese ministry of machinery industry, and a member of China spring association, Kathysia Industrial have the biggest hot coiling line in China. Our hot coiling line can produce the heavy duty springs which diameter is from 20mm to 80mm. It meets all heavy duty springs produce. Welcome to inquiry heavy duty compresssion springs, we will reply you within 24 hours.