German DoBoTech springs DoBoTech models DoBoTech prices

DoBoTech springs are conical disc-shaped and can be used individually or in series or parallel combinations. They bear static or dynamic axial loads at the upper inner edge and lower outer edge, deforming under compression until flattened to store energy as a live load. When necessary, they automatically convert into additional compressive load required for sealing, reducing the continuous tightening requirements for gaskets and packing materials. Disc springs are special springs that are conical in the axial direction and bear loads. After deformation under load, they store potential energy. When bolts loosen, the disc spring releases part of the potential energy to maintain pressure between flange connections to meet sealing requirements. The stress distribution of disc springs decreases uniformly from the inside out, achieving high compensation force with low stroke.

DoBoTech spring principles

When leaf springs are installed in an automobile suspension and the vertical load is positive, all spring leaves deform under force, tending to arch upward. At this time, the axle and frame move closer together. When the axle and frame move apart, the positive vertical load and deformation on the leaf spring gradually decrease, sometimes even reversing. The eye of the main leaf is heavily stressed and is a weak point. To improve the stress condition of the main leaf eye, the end of the second leaf is often bent into an eye wrapping around the outside of the main leaf eye, known as a wrap-around eye. A large gap is left between the main leaf eye and the second leaf's wrap-around eye to allow relative sliding during elastic deformation. In some suspensions, the ends of leaf springs are not made into eyes but use other support connection methods, such as rubber support pads. Flat rectangular steel plates are curved and stacked to form chassis springs. One end is installed on the hanger with a pin, and the other end is connected to the main beam with a shackle, allowing the spring to expand and contract. This is suitable for medium and large trucks. Automobile leaf springs are very important. As known, leaf springs consist of many steel leaves with elasticity, consistent width and thickness, but varying lengths. Their function is to connect the frame and axle in a suspended manner, exposed between the frame and axle, bearing the load impact of wheels on the frame, reducing severe vehicle vibration, and maintaining driving stability and adaptability to different road conditions. When leaf springs bear load impacts, they undergo extension motion, causing strong friction between steel leaves, i.e., compression and tension phenomena. The two friction surfaces generate motion friction forces in different directions, causing the leaf spring temperature to rise, resulting in surface scratches and fine cracks. As the frequency of load impact increases, the friction force generated by extension motion also increases. When the stress concentration point reaches the fatigue limit, it will cause single leaf or entire stack fracture. Kinetic principle tests prove that a steel component undergoing compression-extension motion experiences temperature rise and strength decrease as motion frequency increases. Cracks appear at stress concentration points, gradually expanding and deepening until damage occurs at the fatigue limit. Leaf springs are similar but have higher elasticity and are more durable than general steel components. Apart from other causes, the main reason for leaf spring fracture is poor lubrication, which should be valued by drivers and technical management personnel. Timely lubrication of leaf springs should be performed to reduce friction and disperse stress, prevent surface scratches on steel leaves; reduce intrusion of dust, dirt, and water to prevent rust; and dissipate heat to prevent decrease in elastic strength. General lubrication methods: Lubrication should be performed after the new car break-in period ends, and during use in summer and winter seasons. During lubrication, first remove the leaf spring, open the center bolt to scatter the steel leaves, then evenly apply lithium-based grease or graphite grease on both sides of the steel leaves. After reassembly, an oil film forms between the two friction surfaces (completing lubrication for one set of leaf springs takes only the time required to replace one broken leaf).

DoBoTech 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, which better matches actual conditions. First, when the mold wears, gaps change. Changes in process parameters such as blunt cutting edges, inconsistency in mold thickness and sheet metal deformation resistance cause changes in workpiece deformation resistance, so margin should be left in design. Second, during nitrogen spring inflation, high-pressure gas inevitably has throttling losses, causing spring force to float downward. Third, nitrogen springs have a long life; after a period of use, high-pressure nitrogen will have certain leakage, causing spring force to drop slightly. B. Selection of nitrogen spring quantity: Based on layout requirements, combined with mold structure and force application points, ensure no eccentric loading occurs during mold operation, while also making mold adjustment convenient. This ensures sufficient service life for nitrogen springs. C. Selection of nitrogen spring boost ratio: Can be selected based on the nitrogen spring characteristic curve and stamping process requirements to determine the nitrogen spring model. It is especially important to determine the boost ratio when stable working force change, basically constant working force, or large initial force is required. D. Selection of nitrogen spring stroke: Regardless of the process, when selecting nitrogen springs, hope that the total height of the nitrogen spring is not too high to avoid instability and overly complex structure during mold installation. Also, the larger the stroke, the higher the price of the nitrogen spring, which is particularly important for independent nitrogen springs. If the stroke is indeed large due to process needs, it is recommended to adopt a nitrogen spring seat plate system, which can reduce mold height and improve nitrogen spring stability and reliability. Sometimes for safety and to avoid accidents, when selecting nitrogen springs, a safety stroke of 3-5mm needs to be increased. Selection of nitrogen spring structural form: When designers use nitrogen springs in molds, they first need to decide their structural form. Comprehensive consideration should be given to stamping process requirements of required parts, mold structural form, equipment used, working environment, working conditions, mold cost, and adjustment and maintenance factors. A. Independent type: The most widely applied is the independent nitrogen spring, which occupies less mold space, is firmly placed, and has various structural forms. Several different installation forms do not require any accessories. It can be used by directly placing it in the mold. It is the preferred design form for designers today. B. Pipeline connection type: Pipeline connection type is generally applied to large stamping parts and large coverings. It uses high-pressure pipes to connect individual nitrogen springs together, and installs a control instrument to make the spring force of each nitrogen spring in the entire system equal, thus integrating the entire system into one, equivalent to an independent nitrogen spring. Thereby achieving a larger spring force and balance of spring force transmission, improving mold life, and ensuring the quality of stamped parts.

DoBoTech spring features and applications

Features: Compared with ordinary compression or extension springs, its spring force is very constant, outputting nearly linear spring force, ensuring that the product does not change due to spring force variations during use. In narrow and long spaces, it can minimize space usage as much as possible, increasing possibilities for aesthetic product design. Constant force spring applications: Lift fans, LCD monitors, up-and-down sliding doors and windows, supermarket automatic checkout counters, motor carbon brush pressing devices, cables, stapler springs, power tools, car ashtrays, locomotive carbon brush accessories, medical instruments, mobile phone holders, etc.

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