German hagener feinstahl springs, hagener feinstahl models, hagener feinstahl prices

hagener feinstahl springs are helical springs that withstand compressive forces. The cross-section of the material used is mostly circular, but rectangular sections and multi-strand steel wires are also used. Springs generally have equal pitch. The shapes of compression springs include: cylindrical, conical, convex, concave, and a small number of non-circular shapes. There is a certain gap between the coils of the compression spring. When subjected to external loads, the spring contracts and deforms, storing strain energy. Compression springs provide resistance to external compressive loads. Compression springs use multiple open coils to provide resistance to external pressure (such as gravity pressing down on wheels, or body weight pressing on a mattress). That is, they push back to resist external pressure. Compression springs are generally wound with metal wire at equal pitch and have a fixed wire diameter. In addition, there are conical compression springs, or springs combining conical and straight sections. Depending on the application area, compression springs can be used to resist pressure and/or store energy. Round wire is the most commonly used for compression springs, but compression springs are also made from square, rectangular, and specially shaped wire.

hagener feinstahl spring influencing factors

Springback includes angular springback and curvature springback, which is the result of the combined effect of springback in the bending deformation zone and the non-deformation zone. Many factors affect springback, mainly including: (1) mechanical properties of the material σs, Eoσs the higher the E value, the greater the bending springback; (2) degree of deformation r/t. Under the same conditions, the amount of angular springback increases as the r/t value increases; the amount of curvature springback decreases as the r/t value increases; (3) bending center angle αo a large bending center angle α results in a large springback angle; (4) die clearance Z. Large clearance between the punch and die results in large springback; (5) bending method. Free bending has large springback, corrected bending has smaller springback, and full-form upsetting bending has the smallest springback; (6) workpiece shape and material microstructure state. Complex shapes with more mutual constraints have smaller springback, while springback is larger after cold working hardening; (7) die structure and magnitude of blank holder force. A large blank holder force results in smaller springback after bending the workpiece.

hagener feinstahl spring selection

A. Selection of spring force: Select 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 matches actual conditions. First, when the die wears, changes in clearance occur. Changes in process parameters such as blunt cutting edges, inconsistencies in die thickness and sheet metal deformation resistance, will cause changes in the workpiece's deformation resistance, so allowance should be made for deformation resistance in the design. Second, during charging of the gas spring, high-pressure gas inevitably experiences throttling losses, causing the spring force to float downward. Third, gas springs have a long service life; after a period of use, there will be certain leakage of high-pressure nitrogen, causing the spring force to drop slightly. B. Selection of the number of gas springs: Based on alignment requirements, combined with the die structure and the position of force application points, ensure that no eccentric loading occurs during die operation, while also making die adjustment convenient. This ensures that the gas springs have sufficient service life during use. C. Selection of the boost ratio of the gas spring: Select based on the characteristic curve of the gas spring and stamping process requirements to determine the model of the gas spring. It is particularly important to determine the boost ratio when stable change in working force, basically constant working force, or large initial force is required. D. Selection of gas spring stroke: Regardless of the process, when selecting a gas spring, it is desirable that the total height of the gas spring not be too high, to avoid instability and overly complex structure during installation in the die. 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 seat plate system, which can reduce die height and improve the stability and reliability of the gas spring. Sometimes, for safety and to avoid accidents, when selecting gas springs, it is necessary to increase the 3-5mm safety stroke. Selection of gas spring structural form: When designers use gas springs in dies, they first need to decide on their structural form. Comprehensive consideration should be given to the stamping process requirements of the required parts, the structural form of the die, equipment used, working environment, working conditions, die cost, and adjustment and maintenance factors. A. Independent type: The most widely used is the independent gas spring, which occupies less space in the die, is securely mounted, and comes in various structural forms. Several different installation forms do not require any accessories. They can be used by placing them directly in the die. This 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 entire system into one, equivalent to an independent gas spring. This achieves a larger spring force and balance in spring force transmission, extends die life, and ensures the quality of stamped parts.

hagener feinstahl spring features and applications

Features: Compared to ordinary compression or extension springs, its spring force is very constant, capable of outputting near-linear spring force, ensuring that the product does not change due to variations in spring force during use. In narrow and elongated spaces, it can minimize space usage, enhancing possibilities for aesthetic product design. Constant force spring applications: Lift fans, LCD monitors, up-and-down sliding doors and windows, supermarket automatic checkout counters, motor carbon brush clamping devices, cables, stapler springs, power tools, car ashtrays, locomotive carbon brush accessories, medical instruments, mobile phone holders, etc.

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