German wilhelm becker springs, wilhelm becker models, wilhelm becker prices

wilhelm becker springs are a special type of extension spring, suitable for applications with large elongation and non-increasing load. Constant-force springs consist of spiral metal strips; the inner side of the strip is curved so that each turn wraps tightly around the inner turn. 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 carbon brushes in electrical devices.

wilhelm becker spring mechanical principles

Ring springs are formed by the mating of outer rings with inner conical surfaces and inner rings with outer conical surfaces. The number of outer ring pairs is determined by the magnitude of the load and deformation requirements. Ring springs are commonly used in applications where space is limited but strong buffering is required. A ring spring consists of many pairs of inner and outer rings; if damaged or worn, it is not necessary to replace the entire assembly, only the individual discarded rings need to be replaced, making repair easier and more economical. Due to the high friction on the contact surfaces when the outer and inner rings slide relative to each other along the mating cones, the axial force during loading is balanced by surface pressure and friction. Therefore, the effect of the axial load is effectively reduced, which increases the spring stiffness. During unloading, friction hinders the recovery of the spring's elastic deformation, thus effectively reducing the spring force. The characteristic curve of a ring spring during one loading and unloading cycle is OABO; without the effect of friction, it would be OC. During unloading, the characteristic curve switches from point B, rather than from point E, due to the reduction caused by elastic hysteresis of the spring. Ring spring: A spring composed of alternating stacked washer-like spring steel rings with inner conical and outer cylindrical surfaces, and washer-like spring steel rings with inner cylindrical and outer conical surfaces. The number of inner and outer ring pairs in a ring spring is determined by the magnitude of the load it bears and the deformation requirements.

wilhelm becker 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%-20% to the calculated punching force, which better reflects actual conditions. First, after mold wear, changes such as gap variation and dulling of cutting edges occur. Changes in process parameters, inconsistencies in mold thickness and sheet metal deformation resistance, cause changes in workpiece deformation resistance, so allowance should be made for deformation resistance in the design. Second, during charging of the nitrogen spring, 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, there will be some leakage of high-pressure nitrogen, resulting in a slight decrease in spring force. B. Selection of the number of nitrogen springs: Based on layout 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 nitrogen springs. C. Selection of the boost ratio for nitrogen springs: The boost ratio can be selected 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, it is desirable that the total height of the nitrogen spring is not too high, to avoid instability and overly complex structure during installation in the mold. Moreover, the larger the stroke, the higher the price of the nitrogen spring, which is especially important for independent nitrogen springs. If a large stroke is indeed required due to process needs, it is recommended to adopt a nitrogen spring seat plate system, which can reduce mold height and improve the stability and reliability of the nitrogen spring. Sometimes, for safety and to avoid accidents, a safety stroke of 3-5mm should be added when selecting the nitrogen spring. Selection of nitrogen spring structural form: When using nitrogen springs in molds, designers first need to decide on their 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 used is the independent nitrogen spring, which occupies less mold space, is securely mounted, and comes in various 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. Pipeline connection type: Pipeline connection types are generally applied to large stamping parts and large coverings. They use high-pressure pipes to connect individual nitrogen springs together, and install a control instrument to equalize the spring force of each nitrogen spring in the entire system, thereby integrating the whole system into one, equivalent to a single independent nitrogen spring. This achieves a larger spring force and balance of spring force transmission, extends mold life, and ensures the quality of stamped parts.

wilhelm becker spring compensation method for controlling springback

The compensation method for controlling springback involves controlling the geometric shape and dimensions of the working part of the mold based on the direction and magnitude of the springback of the bent part, so that the springback after bending the workpiece is compensated. For example, for U-shaped parts with significant bending, the end face of the punch or the surface of the stripper plate can be made arc-shaped, or the punch and die can be made into inclined surfaces at a certain angle, so that the deformation generated at the arc or inclined areas during unloading can compensate for the springback deformation of the two corners. Extending from this, the bending compensation method can be used to bend workpieces that are difficult to bend using conventional methods. For the shape shown in Figure 8, the two sides are tightly closed with no forming space. Using the method of deformation springback and correction compensation, bending can be achieved.

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