German FREUDENBERG springs FREUDENBERG models FREUDENBERG prices

FREUDENBERG springs are energy accumulators; they have the function of storing energy but cannot release it slowly. To achieve slow release, a "spring + high transmission ratio mechanism" is required, which is common in mechanical watches. Helical springs have been applied for a very long time; ancient bows and crossbows are two types of helical springs in a broad sense. They can be classified by appearance into ordinary cylindrical helical springs and variable-diameter helical springs (see figure); by the direction of the helix into left-hand springs and right-hand springs. Cylindrical helical springs have a simple structure, are easy to manufacture, and are the most widely used. Their characteristic curve is linear, and they can serve as compression springs, extension springs, and torsion springs. When the load is large and radial dimensions are limited, two compression springs with different diameters can be nested together to form a combination spring. Variable-diameter helical springs include conical helical springs, volute helical springs, and concave helical springs. Conical helical springs offer good buffering performance and can withstand large loads. Volute helical springs can store more energy and withstand larger loads, but the manufacturing process is relatively complex. The performance of concave helical springs is similar to that of conical helical springs, and they are mostly used in seat cushions and mattresses. Spring wire cross-sections include circular and rectangular shapes, with circular cross-sections being the most commonly used.

FREUDENBERG spring features

1) High stiffness, strong buffering and vibration absorption capability, capable of withstanding large loads with small deformation, suitable for applications with limited axial space. 2) Features variable stiffness characteristics, offering a wide range of non-linear properties. 3) Using the same disc springs in different combination methods allows the spring characteristics to vary within a wide range. Combination methods such as face-to-face nesting and stack nesting can be adopted, as well as combinations with different thicknesses and numbers of discs. 4) In stack nesting, for the same deformation, the greater the number of springs, the higher the load. 5) Short stroke, heavy load, small space requirement, convenient combination, easy maintenance and replacement, economical, high safety, and long service life.

FREUDENBERG spring selection

A. Selection of spring force: Choose the quantity, model, and spring force of each gas spring based on the calculated punching force. Generally, the spring force of the gas spring should be selected by adding an increase of 15%-20% to the calculated punching force, which better reflects actual conditions. First, after mold wear, gap changes occur. Changes in process parameters such as blunt cutting edges, inconsistencies in mold thickness and sheet metal deformation resistance cause changes in workpiece deformation resistance, so allowance should be left in the design of deformation resistance. Second, during charging of the gas spring, high-pressure gas inevitably experiences throttling losses, causing a slight decrease in spring force. Third, gas springs have a long service life; after a period of use, there will be certain leakage of high-pressure nitrogen, resulting in a slight drop in spring force. B. Selection of the number of gas springs: Based on forming requirements, combined with the mold structure and the position of force application points, ensure that no eccentric loading occurs during mold operation, while also facilitating mold adjustment. This ensures sufficient service life for the gas springs. C. Selection of the boost ratio for gas springs: Choose based on the gas spring characteristic curve and stamping process requirements to determine the gas spring model. Determining the boost ratio is particularly important when stable force change, basically constant working force, or large initial force is required. D. Selection of gas spring stroke: Regardless of the process, when selecting gas springs, it is preferred that the total height of the gas spring not be too high to avoid instability and overly complex structures during installation on the mold. Moreover, the larger the stroke, the higher the price of the gas spring, which is especially important for independent gas springs. If a large stroke is indeed required due to process needs, it is recommended to adopt a gas spring manifold plate system, which can reduce mold height and improve the stability and reliability of the gas springs. Sometimes, for safety and to avoid accidents, a safety stroke of 3-5mm should be added when selecting gas springs. Selection of gas spring structural forms: When designers use gas springs in molds, they first need to decide on the structural form. Comprehensive consideration should be given to the stamping process requirements of the required parts, the mold structure, equipment used, working environment, working conditions, mold cost, and adjustment and maintenance factors. A. Independent type: The most widely applied is the independent gas spring, which occupies less mold space, is securely mounted, and has diverse structural forms. Several different installation forms do not require any accessories and can be used by directly placing them in the mold. It is the preferred design form for designers today. B. Pipe connection type: Pipe connection types are generally applied to large stamping parts and large coverings. They use high-pressure pipes to connect individual gas springs together, and install a control instrument to equalize the spring force of each gas spring in the entire system, thereby integrating the whole system into one equivalent independent gas spring. This achieves a larger spring force and balance in spring force transmission, extends mold life, and ensures the quality of stamped parts.

FREUDENBERG spring functions and applications

1) Reset function: Springs deform under external force and return to their original state after the force is removed. Many tools and devices utilize this property of springs for resetting. For example, reset springs are installed on the hinges of many building doors, allowing the door to automatically reset after people enter or exit. This function is also used to make automatic umbrellas, automatic pencils, and other convenient items. In addition, various buttons and keys cannot do without reset springs. 2) Drive function: Mechanical clocks and wind-up toys are driven by tightening the mainspring. When the mainspring is tightened, it bends and stores a certain amount of elastic potential energy. Upon release, the elastic potential energy converts into kinetic energy, driving rotation through a transmission device. Toy guns, starter pistols, and military firearms also operate using this property of springs. 3) Buffering function: Springs are installed between the frame and wheels of locomotives and automobiles to use the elasticity of the springs to reduce vehicle bumping. 4) Vibration and sound generation function: When air flows through the reed holes in harmonicas and accordions, it impacts the reeds, causing them to vibrate and produce sound.

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