German federn technik springs, federn technik models, federn technik prices

federn technik spring is a special type of extension spring, suitable for applications with large elongation and constant load. Constant-force springs consist of spiral metal strips; the inner side of the strip is curved so that each coil wraps tightly around the inner coil. When the metal strip is stretched (twisted), internal stress resists the load force, just like a standard extension spring, but the spring rate is nearly constant (zero). See the load/torsion diagram. In use, an ID is typically used to wind this spring tightly onto a drum, with its free end connected to the load, acting like a counterweight. Alternatively, the free end can be fixed, allowing the spring itself to provide the working force, similar to a carbon brush in an electrical device.

federn technik spring mechanical principles

A disc spring is formed by the mating of an outer ring with an internal conical surface and an inner ring with an external conical surface. The number of outer rings is determined by the magnitude of the load and the deformation requirements. Disc springs are commonly used in applications where space is limited but strong buffering is required. A disc spring consists of many pairs of inner and outer rings; if damaged or worn, it is not necessary to replace all of them, only the individual discarded rings need to be replaced, making repair easier and more economical. Since there is significant friction on the contact surfaces when the outer and inner rings slide relative to each other along the mating cones, the axial force is balanced by surface pressure and friction during loading. Therefore, this is equivalent to reducing the effect of the axial load, i.e., increasing the spring stiffness. During unloading, friction hinders the recovery of the spring's elastic deformation, thus equivalently reducing the spring force. The characteristic curve of a disc spring in one loading and unloading cycle is OABO; if there were no friction, it would be OC. During unloading, the characteristic curve switches from point B, rather than from point E, which is due to the reduction caused by spring elastic hysteresis. Disc spring: a spring composed of alternating stacked washer-like spring steel rings with internal conical and external cylindrical surfaces and washer-like spring steel rings with internal cylindrical and external conical surfaces. The number of pairs of inner and outer rings in a disc spring is determined based on the magnitude of the load it bears and the requirements for resulting deformation.

federn technik spring selection

A. Selection of spring force: Select the quantity, model, and spring force of each nitrogen spring based on the calculated punching force. Generally, the spring force of the nitrogen spring should be selected by adding an increase of 15% to 20% to the calculated punching force, which better reflects actual conditions. First, mold wear leads to changes in clearance, dulling of cutting edges, and other process parameter variations. Inconsistencies in mold thickness and sheet metal deformation resistance cause changes in workpiece deformation resistance, so allowance should be made in the design. Second, during charging, high-pressure gas inevitably experiences throttling losses, causing a slight drop in spring force. Third, nitrogen springs have a long service life; after a period of use, some high-pressure nitrogen leakage occurs, resulting in a slight decrease in spring force. B. Selection of the number of nitrogen springs: Based on forming requirements, combined with 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 nitrogen springs. C. Selection of the boost ratio for nitrogen springs: Select based on the characteristic curve of the nitrogen spring and stamping process requirements to determine the nitrogen spring model. Determining the boost ratio is particularly important when stable force change, basically constant working force, or high initial force is required. D. Selection of nitrogen spring stroke: Regardless of the process, when selecting a nitrogen spring, keep the total height as low as possible to avoid instability and overly complex installation structures in the mold. Larger strokes result in higher prices, which is especially important for independent nitrogen springs. If a large stroke is required by the process, it is recommended to use a nitrogen spring seat plate system to reduce mold height and improve stability and reliability. For safety and to avoid accidents, add a safety stroke of 3-5mm when selecting nitrogen springs. Selection of nitrogen spring structural form: When using nitrogen springs in molds, designers must first decide on the structural form, comprehensively considering stamping process requirements, mold structure, equipment, working environment, working conditions, mold cost, and adjustment/maintenance factors. A. Independent type: The most widely used is the independent nitrogen spring, which occupies less mold space, is securely mounted, and comes in various structural forms. Several different installation forms require no accessories and can be directly installed in the mold. It is the preferred design form for designers today. B. Pipe-connected type: Pipe-connected types are generally applied to large stamping parts and large coverings. High-pressure pipes connect individual nitrogen springs, and a control instrument is installed to equalize the spring force of all nitrogen springs in the system, integrating the entire system into one equivalent independent nitrogen spring. This achieves greater spring force and balance in force transmission, extending mold life and ensuring the quality of stamped parts.

federn technik spring compensation method for controlling springback

The compensation method for controlling springback involves controlling the geometric shape and dimensions of the mold's working parts based on the direction and magnitude of the bent part's springback, compensating for springback after bending. For example, for U-shaped parts with significant bending, the punch face or stripper plate surface can be made arc-shaped, or the punch and die can be made with inclined surfaces at a certain angle. This allows deformation generated at the arc or inclined areas during unloading to compensate for springback at the two corners. Extending this, the bending compensation method can bend workpieces that are difficult to bend using conventional methods. For the shape shown in Figure 8, the two sides are tight against each other with no forming space. Using deformation springback and correction compensation methods allows bending.

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