German Hagglunds springs Hagglunds models Hagglunds prices

Hagglunds springs are helical springs that withstand axial tensile forces. Extension springs are generally manufactured from materials with a circular cross-section. When not under load, the coils of an extension spring are typically closed together with no gap. Many different terminal devices or "hooks" are used to ensure the source of tensile force for the extension spring. The working principle of extension springs is opposite to that of compression springs. Compression springs exert a reactive force when compressed, while extension springs exert a reactive force when extended or pulled apart. When the two ends of an extension spring are pulled apart, the spring attempts to pull them back together. Like compression springs, extension springs also absorb and store energy. However, unlike compression springs, most extension springs are usually under a certain degree of tension even when there is no load. This initial tension determines the tightness of the extension spring coils when there is no load.

Hagglunds spring features

1) High stiffness, strong buffering and vibration absorption capacity, capable of withstanding large loads with small deformation, suitable for applications with limited axial space. 2) Features variable stiffness characteristics, with 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 or stacked arrangements can be adopted, as well as combinations with different thicknesses and numbers of discs. 4) When stacked, for the same deformation, the greater the number of springs, the larger the load. 5) Short stroke, heavy load, small space requirement, convenient for combined use, easy maintenance and replacement, economical, high safety, and long service life.

Hagglunds spring structural classification

According to the nature of the force, springs can be divided into extension springs, compression springs, torsion springs, and bending springs. According to shape, they can be divided into disc springs, ring springs, leaf springs, helical springs, truncated conical volute springs, and torsion bar springs. According to the manufacturing process, they can be divided into cold-coiled springs and hot-coiled springs. Ordinary cylindrical springs are widely used due to their simple manufacturing process, ability to be made into various forms according to loading conditions, and simple structure. Spring manufacturing materials should generally have high elastic limits, fatigue limits, impact toughness, and good heat treatment performance. Commonly used materials include carbon spring steel, alloy spring steel, stainless spring steel, as well as copper alloys, nickel alloys, and rubber. Spring manufacturing methods include cold coiling and hot coiling. Spring wire diameters less than 8 mm are generally cold-coiled, while those greater than 8 mm are hot-coiled. Some springs undergo strong pressure or shot peening treatment after manufacturing to improve their load-bearing capacity.

Hagglunds spring compensation method for controlling springback

The compensation method for controlling springback involves controlling the geometric shape and dimensions of the die working parts based on the direction and magnitude of the springback of the bent part, so that the springback after bending 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 with inclined surfaces at a certain angle. Thus, 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 close with no forming space. Using methods of deformation springback and correction compensation, bending can be achieved.

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