Linear waveform spring

 

 

 

Flexible linear elastic body

Linear waveform spring (also known as strip waveform spring) is a long and continuous wave shaped elastic element, which is formed by integral stamping and has the ability to deform elastically along the length direction. It can be bent into different shapes (such as arc, U, or even closed ring) according to needs, and can also be used directly in a straight line state. Its core features include:

Structural form: The main body is a long strip of metal sheet, with continuous peaks and valleys (mostly sine waves, trapezoidal waves, or triangular waves) punched out on the surface at a certain period. The wave spacing (distance between adjacent peaks/valleys) is usually 2-10mm, the wave height (vertical distance from peak to valley) is 0.5-5mm, and the length can be customized (from a few centimeters to several meters).

Raw materials and processes: Elastic materials such as spring steel (such as 65Mn) and stainless steel (304/316) are used, with a thickness of 0.1-2mm. They are formed by precision stamping in one go (without welding, ensuring uniform overall elasticity), and the surface can be galvanized or nickel plated to enhance corrosion resistance.

Core characteristics: It mainly bears lateral bending force or axial pressure (generating elastic force when compressed/stretched along the length direction), and the magnitude of the elastic force is positively correlated with waveform parameters (wave height, wave distance, sheet thickness) and material strength. The total elastic force can be adjusted by cutting the length.

 

Core advantage: Four unique values brought by linear structure

·Flexible in form, suitable for non circular installation spaces

Unlike circular wave springs, which can only be used in circular cavities, linear wave springs can be flexibly bent according to the device structure (minimum bending radius ≥ 5 times the thickness of the sheet to avoid breakage), and are suitable for square, irregular cavities or long spaces. For example, in the pre tightening of a square bearing seat, the linear wave spring can be bent into a rectangle and tightly adhered to the inner wall to provide uniform elastic force; In the buffer of long-distance guide rails, it is directly installed in a straight line state, covering the entire length of elastic support.

·Adjustable length, customized elasticity according to needs

The total elastic force of the linear wave spring is approximately proportional to the effective working length (under the same waveform parameters, increasing the length by 1 times increases the elastic force by about 0.8~1 times). Users can quickly adjust the elastic force by cutting the length (without the need to re mold). For example, a certain automation equipment requires elastic elements with two types of elasticity, 50N and 100N. Simply cut the same specification linear wave spring into 100mm and 200mm, significantly reducing customization costs (saving more than 60% compared to ring wave spring mold opening costs).

·Lightweight design, saving installation space

Under the same elastic force, the weight of a linear wave spring is only 30% to 50% of that of a helical spring of the same length (due to the lack of material redundancy in the helical structure), and its thickness is thin (0.1~2mm), which can be embedded in narrow gaps (such as assembly gaps with a thickness of 5mm). For example, in the buffering of mobile phone battery covers, 0.3mm thick linear wave springs can replace traditional rubber pads, reducing thickness and avoiding rubber aging problems.

·Uniform elasticity, no risk of "dead point" failure

The continuous waveform structure distributes the elastic force evenly along the length direction (each waveform deforms independently and does not interfere with each other), while the coil spring is prone to "local compression" when the force is uneven at both ends due to the superposition of turns. In the clamping scenario of precision equipment (such as the elastic support of chip testing probes), linear wave springs can ensure that the elastic error of each contact point is ≤ 5%, far lower than the 10%~15% of spiral springs.

 

Applicable scenarios: Non circular, long-distance elastic demands

The characteristics of linear waveform springs make them significantly advantageous in the following scenarios:

·Precision instruments and electronic equipment: such as clamping devices for semiconductor wafers (requiring long elastic pieces to evenly press the edges of the wafer), and button rebound for mobile phones/computers (linear wave springs bent into a U-shape, replacing traditional metal spring plates, with a lifespan increased to more than 10 times).

·Automation and mechanical equipment: pre tensioning of linear guides (installation of linear wave springs along the length of the guide rail to compensate for gaps), buffering of pneumatic grippers (bending into an arc shape, fitting the inner wall of the gripper to avoid workpiece injury).

·Automobile and Rail Transit: Elastic support for door seals (linear wave springs embedded in rubber strips to improve the uniformity of sealing pressure), damping for seat adjustment mechanisms (installed in a straight line to provide stable reverse elastic force).

·Sealing and pre tightening of irregular structures: sealing of square flanges (bending linear wave springs into rectangles, compressing sealing gaskets to avoid leakage caused by insufficient elasticity of traditional annular springs in corners), fixing of irregular cavity components (such as irregular sensors in medical equipment, adapting to complex spaces through trimmed linear wave springs).