German s p federnwerk springs s p federnwerk models s p federnwerk prices

s p federnwerk spring is a new type of elastic component that uses high-pressure nitrogen as the working medium. It features compact size, high spring force, long stroke, smooth operation, precision manufacturing, long service life (one million cycles), flat force curve, and no need for pre-loading. It performs tasks that are difficult for conventional elastic components such as metal springs, rubber, and air cushions. It simplifies mold design and manufacturing, facilitates mold installation and adjustment, extends mold service life, ensures stable product quality, and can be designed as a nitrogen spring system to participate in operations as part of the mold. It allows easy implementation of constant pressure and delayed action within the system, making it an ideal new-generation elastic component with flexible performance.

s p federnwerk spring structure

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. Its ends can be shaped as splines, square, hexagonal, or cylindrical with flats, 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.

s p federnwerk spring selection

A. Selection of spring force: Select the quantity, model, and spring force of each nitrogen spring based on the calculated punching force. Generally, the spring force of the nitrogen spring should be selected by adding an increase of 15%-20% to the calculated punching force to better match actual conditions. First, after mold wear, changes in clearance, dulling of cutting edges, and other process parameters occur. Inconsistencies in mold thickness and deformation resistance of sheet metal cause changes in workpiece deformation resistance, so allowance should be made in the design. Second, during charging, high-pressure gas inevitably suffers throttling losses, causing a slight drop in spring force. Third, nitrogen springs have a long service life; after a period of use, some high-pressure nitrogen leakage occurs, causing a slight decrease in spring force. B. Selection of nitrogen spring quantity: Based on forming requirements, combined with mold structure and the placement of force application points, ensure that the mold does not experience eccentric loading during operation, while also facilitating mold adjustment. This ensures sufficient service life for the nitrogen springs. C. Selection of nitrogen spring boost ratio: Select based on the nitrogen spring characteristic curve and stamping process requirements to determine the nitrogen spring model. Determining the boost ratio is particularly important when stable force change, basically constant working force, or high initial force is required. D. Selection of nitrogen spring stroke: Regardless of the process, when selecting a nitrogen spring, keep the total height low to avoid instability and overly complex installation structures in the mold. Larger strokes result in higher prices, which is especially important for independent nitrogen springs. If a large stroke is required by the process, it is recommended to use a nitrogen spring seat plate system to reduce mold height and improve stability and reliability. For safety and to avoid accidents, increase the 3-5mm safety stroke when selecting nitrogen springs. Selection of nitrogen spring structural form: When using nitrogen springs in molds, designers must first decide on the structural form. Consider stamping process requirements, mold structure, equipment used, working environment, working conditions, mold cost, and adjustment/maintenance factors. A. Independent type: The most widely used is the independent nitrogen spring. It occupies little mold space, is securely mounted, and comes in various structural forms. Several different installation forms require no accessories and can be directly installed in the mold. It is the preferred design form for designers today. B. Pipe-connected type: Pipe-connected types are generally applied to large stamping parts and large coverings. High-pressure pipes connect individual nitrogen springs, and a control instrument is installed to equalize the spring force of all nitrogen springs in the system, integrating the entire system into one equivalent independent nitrogen spring. This achieves greater spring force and balance in force transmission, extending mold life and ensuring the quality of stamped parts.

s p federnwerk spring classification

1) ISO International Standard Type: ISO nitrogen springs are the most common typical type of nitrogen springs. All technical parameters comply with ISO11901 international standards for nitrogen springs and Chinese national standards; B type nitrogen springs also comply with the nitrogen spring standards of companies such as FORD-WDX3560 (Ford), GM-M-150 (General Motors), and Renault (Renault). 2) Compact Structure Type: The compact structure type is also called J type nitrogen spring, a series product fully named J type compact structure nitrogen spring. J type compact structure nitrogen springs are popular among mold designers. Compared with the B series nitrogen springs, they have a shorter cylinder base length, resulting in a shorter total length, which reduces mold design height. They are one of the preferred varieties for mold-specific nitrogen springs. 3) Ultra-compact Type: This is the model with the shortest base length among nitrogen springs worldwide. Compared with other types of nitrogen springs (except T type extra-slim structure type), the outer diameter is one size smaller, but the piston rod diameter is the same, resulting in a compact size and high force. C type nitrogen springs perform no worse than ISO standard type nitrogen springs in all aspects when the required working stroke is not too long. 4) Extra-slim Structure Type: This is the most compact cylinder diameter type among nitrogen springs. It uses piston sealing, and its outer diameter is even smaller than that of the ultra-compact type. The working stroke of the H type nitrogen spring series generally does not exceed 50mm, and its performance in all aspects is no worse than that of C type nitrogen springs.

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