German KNF springs KNF models KNF prices

KNF springs consist of tension springs and connecting springs. The pitch and helix direction of the tension spring and the connecting spring are identical. A special fixture is used to clamp one end of the tension spring and screw it into the connecting spring. The other end of the tension spring is then rotated and fitted onto the other end of the connecting spring. Rotational force is used to screw the connecting spring into the interior of the tension spring, forming a ring spring. This utility model ring spring does not affect the shape and elasticity of the connection area, and the secure connection is applied in various situations requiring ring springs. The ring spring is composed of alternating stacked washer-shaped spring steel discs with inner conical and outer cylindrical surfaces and washer-shaped spring steel discs with inner cylindrical and outer conical surfaces. The number of pairs of inner and outer rings in the ring spring is determined based on the magnitude of the load it bears and the deformation requirements. Ring springs are applied in spaces with limited room where strong buffering is required.

KNF spring surface treatment

1) Black oxide treatment: This surface treatment provides a black surface; black oxide is primarily for aesthetic improvement rather than corrosion resistance. 2) Chrome plating: Chrome plating is mainly a treatment method for carbon steel products, primarily to increase corrosion resistance. 3) Oil impregnation: Oil impregnation is the standard treatment method for carbon steel parts, intended to prevent rust during transportation and storage. 4) Passivation: Passivation is a cleaning method for stainless steel materials. 5) Phosphate coating: Phosphating offers better corrosion resistance than black oxide. 6) Ultrasonic cleaning: This is the standard surface treatment method for stainless steel materials. 7) Vibratory deburring: To eliminate sharp edges on the product.

KNF spring selection

A. Selection of spring force: Select the quantity, model, and spring force of each gas spring based on the calculated punching force. Generally, the spring force of the gas spring should be selected by adding an increment of 15% to 20% to the calculated punching force, which better matches actual conditions. First, after mold wear, gap changes occur. 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 for deformation resistance in the design. Second, during gas spring inflation, high-pressure gas inevitably experiences throttling losses, causing a slight decrease in spring force. Third, gas springs have a long service life; after a period of use, there will be some leakage of high-pressure nitrogen, causing a slight drop in spring force. B. Selection of the number of gas springs: Based on alignment requirements, combined with the mold structure and the position of force application points, ensure that no eccentric loading occurs during mold operation, while also facilitating mold adjustment. This ensures sufficient service life for the gas springs during use. C. Selection of the gas spring boost ratio: The boost ratio can be selected based on the gas spring characteristic curve and stamping process requirements to determine the gas spring model. Determining the boost ratio is particularly important when stable force change, basically constant working force, or large initial force is required. D. Selection of gas spring stroke: Regardless of the process, when selecting gas springs, it is preferred that the total height of the gas spring not be too high to avoid instability and overly complex structures during installation in the mold. Additionally, the larger the stroke, the higher the price of the gas spring, which is especially important for independent gas springs. If a large stroke is indeed required due to process needs, it is recommended to adopt a gas spring seat plate system, which can reduce mold height and improve the stability and reliability of the gas springs. Sometimes, for safety and to avoid accidents, a safety stroke of 3-5mm should be added when selecting gas springs. Selection of gas spring structural form: When designers use gas springs in molds, they first need to decide on the structural form. Comprehensive consideration should be given to the stamping process requirements of the required parts, the mold structure, equipment used, working environment, working conditions, mold cost, and adjustment and maintenance factors. A. Independent type: The most widely applied is the independent gas spring, which occupies less mold space, is securely installed, and has diverse structural forms. Several different installation forms do not require any accessories and can be used by placing them directly in the mold. It is the preferred design form for designers today. B. Pipeline connection type: Pipeline connection types are generally applied to large stamping parts and large coverings. They use high-pressure pipes to connect individual gas springs together, and install a control instrument to equalize the spring force of each gas spring in the entire system, thereby integrating the whole system into one, equivalent to a single independent gas spring. This achieves a larger spring force and balance in spring force transmission, extends mold life, and ensures the quality of stamped parts.

KNF spring classification

1) Standard disc springs, trapezoidal cross-section disc springs, conical trapezoidal cross-section. Disc springs: Simple shape and structure, widely applied. They can be used individually, in opposed pairs, stacked combinations, or composite disc spring groups, bearing static or variable loads, used as strong buffering and vibration-damping springs in heavy machinery, aircraft, artillery, and other weapons. 2) Diaphragm springs: Mainly used in automotive clutches, functioning through separation fingers and disc spring components. 3) Wave washers: Extensively used in mechanical seals; can be further developed into spiral wave springs. 4) Slotted disc springs: Typically used in clutches, such as those in lathes, automobiles, and tractors. 5) Circular plate disc springs: The cross-section is circular plate-shaped, deforming into a truncated cone shape under load. Simple structure, high stiffness, used for applications with special requirements. 6) Spiral disc springs: Possess dual characteristics of disc springs and coil springs, allowing for different stiffness requirements. 7) Wave cylindrical springs (wave springs): Formed by stacking wave washers into a cylindrical shape, allowing for greater deformation.

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