D11848J spring Germany durovis model D11848J price

D11848J spring is a new type of elastic component that uses high-pressure nitrogen as the working medium. It features a compact size, high spring force, long stroke, smooth operation, precision manufacturing, long service life (one million cycles), a 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, and ensures stable product quality. It can also be designed as a nitrogen spring system to operate as part of the mold, allowing convenient implementation of constant pressure and delayed action within the system. It is an ideal new-generation elastic component with flexible performance.

D11848J spring installation and removal

Hydraulic hand pallet trucks are widely used in production. During maintenance of their pressure oil pumps, we found that the pressure spring responsible for returning the pump piston rod and the truck's pressure arm to position has a wire diameter of n, with a stored elastic force reaching 1000N, making its installation and removal very difficult. This often delays troubleshooting time, directly affecting production progress. Several measures were attempted, but none yielded satisfactory results. Therefore, I designed the pressure spring installation/removal tool shown in Figure 1. The tool consists of a lower pressure lever 1, pressure blocks 10, connecting pins 14, nuts 1, spherical washers 12, upper pressure lever 13, positioning sleeves 16, and levers. During operation, rotate the nut 11 to the appropriate position so that the cylindrical head claw of the lower pressure lever 1 contacts the truck body 2. The two pressure blocks 10 press symmetrically against the washer 6. Rotate the compression nut n to tighten the pull rod 15, causing the upper pressure lever 13 and lower pressure lever 1 to move relative to each other, thereby compressing the pressure spring. When the washer 6 clears the cylindrical pin 7, the pressure roller shaft 9, pressure roller 8, and cylindrical pin 7 can be removed. Then, loosen the nut 11, remove the installation/removal tool, and take out the pressure spring to disassemble, inspect, and repair the pressure oil pump. The positioning sleeve 16 on the tool is a critical component. During manufacturing, one end features an internal spherical surface with a slot-shaped hole in the middle, while the other end is an inclined flat surface, forming an interference fit with the pressure lever. It must maintain good contact with the spherical washer 12 and the ball head of the lever 15. The pressure block 10 and connecting pin 14 have a clearance fit, requiring flexible rotation. The connecting pin 14 and upper pressure lever 13 have an interference fit. The connecting shaft 18 and pressure lever have a clearance fit.

D11848J spring selection

A. Selection of spring force: Choose the quantity, model, and spring force of each nitrogen spring based on the calculated punching force. Generally, it is more practical to select the nitrogen spring force by adding an increment of 15%-20% to the calculated punching force. First, mold wear leads to changes in clearance. Changes in process parameters such as blunt cutting edges, inconsistencies in mold thickness and sheet metal deformation resistance cause changes in workpiece deformation resistance, so allowance should be made in the design. Second, during charging, high-pressure gas inevitably experiences throttling losses, causing a slight decrease in spring force. Third, although nitrogen springs have a long service life, high-pressure nitrogen leakage after a period of use causes a slight drop in spring force. B. Selection of nitrogen spring quantity: Determine based on layout requirements, combining mold structure and force application points to prevent uneven loading during operation and facilitate mold adjustment. This ensures sufficient service life for the nitrogen springs. C. Selection of nitrogen spring boost ratio: Choose based on the nitrogen spring characteristic curve and stamping process requirements to determine the 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 complex installation structures. Larger strokes increase the price, 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 base plate system to reduce mold height and improve stability and reliability. For safety and to avoid accidents, increase the safety stroke by 3-5mm 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, working environment, conditions, mold cost, and adjustment/maintenance factors. A. Independent type: The independent nitrogen spring is the most widely used. It occupies little mold space, is securely mounted, and comes in various structural forms. Several different installation forms require no accessories and can be placed directly into the mold. It is the preferred design form for today's designers. B. Pipe-connected type: Pipe-connected types are generally used for large stamping parts and large coverings. High-pressure pipes connect individual nitrogen springs, and a control instrument is installed to equalize the spring force across the system, integrating it into a single unit equivalent to an independent nitrogen spring. This achieves greater spring force and balance in force transmission, extending mold life and ensuring stamping part quality.

D11848J spring classification

1) ISO International Standard Type: ISO nitrogen springs are the most common typical type. All technical parameters comply with the ISO11901 international standard for nitrogen springs and Chinese national standards. Type B 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: Also known as Type J nitrogen springs, this is a series of products fully named Type J compact structure nitrogen springs. Type J compact structure nitrogen springs are popular among mold designers. Compared to the B series, they have a shorter cylinder base length and total length, reducing mold design height. They are a preferred choice for mold-specific nitrogen springs. 3) Ultra-compact Type: This model has the shortest base length among nitrogen springs worldwide. Its outer diameter is one size smaller than other types (except Type T extra-slim structure), but the piston rod diameter is the same, resulting in a compact size and high force. Type C nitrogen springs perform no worse than ISO standard type nitrogen springs when the working stroke requirement is not too long. 4) Extra-slim Structure Type: This is the most compact cylinder diameter type among nitrogen springs, featuring piston sealing and an outer diameter even smaller than the ultra-compact type. The working stroke of the Type H nitrogen spring series generally does not exceed 50mm, and its performance is no worse than that of Type C nitrogen springs.

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