Germany NORMTEILWERK ROBERT springs NORMTEILWERK ROBERT models NORMTEILWERK ROBERT prices

NORMTEILWERK ROBERT spring is a new type of elastic component that uses high-pressure nitrogen as the working medium. It features compact size, high spring force, long stroke, smooth operation, precision manufacturing, long service life (one million cycles), flat force-deflection curve, and no need for pre-loading. It performs tasks that are difficult for conventional elastic components such as metal springs, rubber, and air cushions. It simplifies mold design and manufacturing, facilitates mold installation and adjustment, extends mold service life, ensures stable product quality, and can also be designed as a nitrogen spring system to serve as part of the mold. It allows easy implementation of constant pressure and delayed action within the system, making it an ideal next-generation elastic component with flexible performance.

NORMTEILWERK ROBERT spring principle

When leaf springs are installed in an automobile suspension and subjected to positive vertical loads, each spring leaf deforms under stress, tending to arch upward. At this time, the axle and frame move closer together. When the axle and frame move apart, the positive vertical load and deformation on the leaf spring gradually decrease, sometimes even reversing direction. The eye of the main leaf is heavily stressed and is a weak point. To improve the stress condition of the main leaf eye, the end of the second leaf is often bent into an eye that wraps around the outside of the main leaf eye, known as a wrap-around eye. A larger gap is left between the main leaf eye and the second leaf's wrap-around eye to allow relative sliding during elastic deformation. In some suspensions, the ends of the leaf springs are not formed into eyes but use other support connection methods, such as rubber support pads. Flat rectangular steel plates are curved and stacked to form chassis springs. One end is mounted on a hanger with a pin, and the other end is connected to the frame beam with a shackle, allowing the spring to expand and contract. This design is suitable for medium and large trucks. Automobile leaf springs are very important. As is well known, leaf springs consist of many steel leaves that are elastic, uniform in width and thickness, but vary in length. Their function is to connect the frame and axle via suspension, exposed between the frame and axle, bearing the load impact from the wheels on the frame, reducing severe vehicle vibration, and maintaining driving stability and adaptability to different road conditions. When leaf springs bear load impacts, they undergo extension motion, causing intense friction between steel leaves, resulting in compression and tension phenomena. The two friction surfaces generate frictional forces in different directions, causing the temperature of the leaf spring to rise, leading to surface scoring and fine cracks. As the frequency of load impact increases, the frictional force generated by the extension motion also increases. When the stress concentration point reaches the fatigue limit, single-leaf or entire stack fracture occurs. Kinetic motion principles and tests prove that when a steel component undergoing compression-extension motion experiences increased motion frequency, its temperature rises, strength decreases, cracks appear at stress concentration points and gradually widen and deepen, leading to damage upon reaching the fatigue limit. Leaf springs behave similarly, though they have higher elasticity and are more durable than general steel components. Apart from other causes, the primary reason for leaf spring fracture is poor lubrication. Drivers and technical management personnel should pay attention to this and perform timely lubrication of leaf springs to reduce friction, disperse stress, prevent surface scoring of steel leaves, reduce intrusion of dust, dirt, and water to prevent rust, and dissipate heat to prevent a decline in elastic strength. General lubrication methods include performing lubrication after the break-in period of a new vehicle ends, and during use in summer and winter. During lubrication, first remove the leaf spring, open the center bolt to separate the steel leaves, then evenly apply lithium-based or graphite-based grease to both sides of the steel leaves. After reassembly, an oil film forms between the two friction surfaces (completing the lubrication of one set of leaf springs takes only as much time as replacing one broken leaf).

NORMTEILWERK ROBERT spring material

Disc springs are mostly manufactured from cold-rolled or hot-rolled strip steel, sheet metal, or forged blanks (forging ratio not less than 3). Common materials include spring steels such as 60S2MA and 50CVA. For thicknesses less than 1.1, high-carbon steel can also be used. Performance requirements for disc spring materials dictate that after heat treatment, they must possess high ultimate strength, yield strength, elastic limit, and fatigue limit, while also requiring high impact toughness, plasticity, and the highest possible yield-to-tensile strength ratio. To meet these performance criteria, most domestic and international manufacturers use high-quality cold-rolled or hot-rolled steel strips or sheets. For disc springs with thickness greater than 6 mm, forged blanks are used, primarily consisting of medium-carbon low-alloy spring steels (silicon-manganese or chromium-vanadium spring steels) and high-quality carbon spring steels. Due to China's high silicon-manganese content and low chromium-vanadium availability, disc springs mainly use 60Si2MnA. Comparing the two, 50CrVA has better hardenability, tempering stability, and impact toughness than 60Si2MnA, but 50CrVA is more expensive and suitable for applications with high fatigue requirements.

NORMTEILWERK ROBERT spring applications

To a large extent, disc springs are replacing cylindrical helical springs. They are commonly used in heavy machinery (such as presses) and weapons like artillery and aircraft as powerful buffer and vibration-damping springs. They serve as clamping springs for automobile and tractor clutches and safety valves, and as energy storage elements in mobile devices. Disadvantage: Load deviation is difficult to guarantee. Disc springs can be divided into three categories based on cross-sectional shape: standard disc springs (rectangular cross-section), disc springs with radial slots, and trapezoidal cross-section disc springs. Standard disc springs are divided into those with and without support surfaces. Disc springs with radial slots are based on standard disc springs, with several uniformly distributed slots cut radially. Slots can be cut from the inner hole toward the outer diameter or from the outer diameter toward the inner hole. Trapezoidal cross-section disc springs are divided into two types: those with inner edge thickness greater than outer edge thickness, and those with inner edge thickness less than outer edge thickness. Since the deformation and load values of a single disc spring often fail to meet usage requirements, they can be used in groups to form disc spring assemblies (columns). Typical combinations include stacked disc springs, compound disc springs, and other combined disc springs. Compared to cylindrical helical springs, disc springs have the following characteristics: 1) The load-deformation characteristic curve is non-linear. 2) Disc springs are thin and easily formed into assemblies, allowing modular assembly and replacement, which facilitates maintenance. 3) Disc springs with radial slots exhibit zero-stiffness characteristics. This feature can be applied in situations where spring force needs to remain basically stable within a certain deformation range. 4) The vibration absorption performance of disc springs is no lower than that of cylindrical helical springs. When using stacked combinations, the friction between disc spring leaves provides significant damping, dissipating impact energy.

Weidou Intelligent Technology professionally sells German NORMTEILWERK ROBERT compression springs, NORMTEILWERK ROBERT extension springs, NORMTEILWERK ROBERT helical springs, NORMTEILWERK ROBERT wave springs, NORMTEILWERK ROBERT constant force springs, NORMTEILWERK ROBERT torsion springs, NORMTEILWERK ROBERT bending springs, NORMTEILWERK ROBERT disc springs, NORMTEILWERK ROBERT ring springs, NORMTEILWERK ROBERT leaf springs, NORMTEILWERK ROBERT torsion bar springs, NORMTEILWERK ROBERT tension springs, NORMTEILWERK ROBERT retaining rings, NORMTEILWERK ROBERT tension springs, NORMTEILWERK ROBERT die springs. NORMTEILWERK ROBERT products are original imports from Germany. Customers are welcome to inquire and order.