German hek springs hek models hek prices

hek 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 are generally wound with metal wire at equal pitch and have a fixed wire diameter. 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 special-shaped wires.

hek 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. There are many factors affecting springback, mainly including: (1) material mechanical properties σs, Eoσs the higher the value, the smaller 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 α o the larger the bending center angle α, the larger the 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 small springback, and full-form upsetting bending has the smallest springback; (6) workpiece shape and material microstructure state. Complex shapes with more mutual constraints have small springback, and springback is large after work hardening; (7) die structure and magnitude of blank holder force. Large blank holder force results in small springback after bending the workpiece.

hek 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 is more consistent with actual conditions. First, when the die wears, gaps change. Changes in process parameters such as blunt cutting edges, inconsistencies in die thickness and sheet metal deformation resistance, will cause changes in workpiece 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 layout 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 sufficient service life for the gas springs during use. C. Selection of the boost ratio of gas springs: Can be selected based on the characteristic curve of the gas spring and stamping process requirements to determine the gas spring model. It is particularly important to determine the boost ratio when stable changes in working force, or basically constant working force with large initial force, are required. D. Selection of gas spring stroke: Regardless of the process, when selecting gas springs, it is desirable that the total height of the gas spring not be too high, to avoid instability and overly complex structures during installation in the die. Also, the larger the stroke, the higher the price of the gas spring, which is especially important for independent gas springs. If the process requires a large stroke, it is recommended to use a gas spring seat plate system, which can reduce die height and improve the stability and reliability of the gas springs. 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 the 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 has 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. Pipeline connection type: Pipeline 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.

hek 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 such as artillery and aircraft, as strong buffer and vibration-damping springs, as clamping springs for automobile and tractor clutches and safety valves, and as energy storage elements for mobile devices. Disadvantage: Load deviation is difficult to guarantee. Disc springs can be divided into three categories based on cross-sectional shape: ordinary disc springs (with rectangular cross-section), disc springs with radial grooves, and trapezoidal cross-section disc springs. Ordinary disc springs are divided into two types: with support surface and without support surface; disc springs with radial grooves are based on ordinary disc springs, with several uniformly distributed slots cut radially. Slots can be cut from the inner hole towards the outer circle, or from the outer circle towards the inner hole; trapezoidal cross-section disc springs can be 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 cannot meet usage requirements, they can be used in groups to form disc spring assemblies (columns). Typical combinations include: stacked combination disc springs, composite combination disc springs, and other combination disc springs. Compared with cylindrical helical springs, disc springs have the following characteristics: 1) The load-deformation characteristic curve is nonlinear. 2) Disc springs are thin and easy to form assemblies, allowing for block-style assembly and replacement, thus facilitating maintenance. 3) Disc springs with radial slots have zero stiffness characteristics. This characteristic can be applied in situations where the spring force is required 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 plates provides greater damping, dissipating impact energy.

Weidou Intelligent Technology professionally sells German hek compression springs, hek extension springs, hek helical springs, hek wave springs, hek constant force springs, hek torsion springs, hek bending springs, hek disc springs, hek ring springs, hek leaf springs, hek torsion bar springs, hek tension springs, hek retaining rings, hek tension springs, hek die springs, hek original German imports. Welcome customers to inquire and order.