Bonnell springs, known for their hourglass shape and durability, are a staple in mid-range to budget mattresses. At the heart of producing these springs lies the Bonnell spring coiling machine—a specialized device that transforms raw steel wire into uniform, functional springs efficiently.
The machine operates through a streamlined, automated process. First, a wire feeding system pulls high-carbon steel wire (typically 1.8–2.5mm in diameter) from a spool, straightening it to eliminate kinks. Next, the coiling mechanism—equipped with adjustable mandrels and guide rollers—shapes the wire into the iconic Bonnell spiral. Operators can program key parameters (e.g., coil diameter, number of turns, and tapering angle for the hourglass shape) via a digital control panel, ensuring consistency across batches. After coiling, a cutting unit trims the spring to the required length, while a heat-treatment module (in advanced models) may temper the steel to enhance elasticity and prevent sagging over time.
Technical advantages of modern Bonnell coiling machines include high productivity (up to 120 springs per minute), precision (tolerance within ±0.1mm), and versatility. They can adapt to different wire gauges and spring specifications, catering to diverse mattress designs. Safety features like emergency stop buttons and wire jam detectors also minimize downtime and operator risk.
In the mattress industry, this machine is indispensable. It reduces manual labor, cuts production costs, and guarantees uniform spring quality—critical for mattress comfort and longevity. As consumer demand for durable, affordable mattresses grows, Bonnell spring coiling machines continue to evolve, with newer models integrating IoT for real-time monitoring and predictive maintenance, solidifying their role in efficient, high-quality spring production.
