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franz orth 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 without any load. This initial tension determines the tightness of the extension spring coils when there is no load.

franz orth 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) mechanical properties of the material σs, Eo the higher the σs 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 a larger bending center angle α results in a larger springback angle; (4) die clearance Z. A larger clearance between the punch and die results in greater springback; (5) bending method. Free bending results in large springback, corrected bending results in smaller springback, and full-form upsetting bending results in the smallest springback; (6) workpiece shape and material microstructure state. Complex shapes with more mutual constraints result in smaller springback, while springback is greater after work hardening; (7) die structure and magnitude of blank holder force. A larger blank holder force results in smaller springback after bending the workpiece.

franz orth spring structure and principle

The torsion bar spring itself is a torsion bar made of spring steel. The cross-section of the torsion bar is usually circular, with a few being tubular or rectangular. The shapes of its two ends can be made into splines, square, hexagonal, or cylindrical with flat surfaces, etc., so that one end is fixed to the vehicle frame and the other end is fixed to the suspension arm, which is connected to the wheel. One end of the torsion bar spring is connected and fixed to the vehicle frame, and the other end is connected to the wheel via the suspension arm. When the wheel encounters an obstacle on the ground and jumps upward, the wheel drives the suspension arm to rotate around the axis of the torsion bar by a certain angle, causing the torsion bar to undergo torsional deformation (elastic deformation). At the same time, the elastic deformation energy stored by the torsional deformation of the torsion bar is released when the wheel leaves the obstacle, allowing the force transmission mechanism and the wheel to quickly return to their original positions. During the manufacturing of torsion bar springs, the torsion bar is pre-twisted to produce a permanent torsional deformation, giving it a certain prestress. The direction of the pre-applied torsion is the same as the direction of torsion when the torsion bar is installed and working on the vehicle, with the aim of reducing the actual stress during operation and extending service life. Note that left and right torsion bars are not interchangeable.

franz orth spring functions and applications

Functions: 1) Measurement function. We know that within the elastic limit, the extension (or contraction) of a spring is proportional to the external force. Spring scales are made using this property of springs. 2) Clamping function. Observing various electrical switches reveals that one of the two contacts of a switch must be equipped with a spring to ensure tight contact between the two contacts for good conductivity. If the contact is poor, the resistance at the contact point increases, generating more heat when current passes through, which can seriously cause the metal at the contact point to melt. The two metal pins of bayonet lamp holders are also equipped with springs to ensure good contact; the central metal piece of screw-in lamp holders and all contact metal pieces of sockets are spring leaves, whose function is to ensure tight contact between both parties to maintain good conductivity. In cassette tapes, there is a phosphor bronze spring leaf that uses the elastic force generated by its bending deformation to keep the magnetic head in close contact with the tape. In a stapler, there is a long helical spring that serves to push the staples tightly on one hand, and on the other hand, when the frontmost staple is pushed out, it can feed the subsequent staples to the front for comfortable ejection, thus automatically pushing staples one by one to the front until all staples are ejected. Many machines' automatic feeding systems and the automatic chambering of bullets in automatic rifles rely on this function of springs. In addition, clothespins, ballpoint pens, and clips on pen caps utilize the clamping function of springs to attach to clothes. Applications: 1) Supporting vehicle body weight, meaning that most of the vehicle's weight is normally borne by the springs. 2) Mitigating road bumps. Helical springs are buffering elements. When the impact force from the road surface is transmitted to the helical spring via the wheel, the helical spring deforms, absorbing the kinetic energy of the wheel and converting it into potential energy of the helical spring, thereby mitigating the impact of the ground on the vehicle body. However, the helical spring itself does not consume energy; the spring storing potential energy will restore its original shape, converting the potential energy back into kinetic energy. If springs are used alone without damping elements, some light vehicles will bounce up and down continuously after a single impact, like acrobats jumping on a trampoline. In automotive manufacturing, the axle of an independent suspension is divided into two sections, with each wheel independently installed under the frame via a helical spring. When one wheel bounces, the other wheel is unaffected, allowing both wheels to move independently, which improves the stability and comfort of the vehicle.

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