German H&K springs H&K models H&K prices

H&K springs consist of tension springs and connecting springs. The pitch and helix direction of the tension springs and connecting springs are identical. Use a special fixture to clamp one end of the tension spring and screw it into the connecting spring. Then rotate the other end of the tension spring and fit it onto the other end of the connecting spring. Use rotational force to screw the connecting spring inside the tension spring, forming the tension spring into a ring spring. The utility model ring spring does not affect the shape and elasticity of the connection part, and the connection is firm, making it suitable for various applications 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 of the ring spring is determined based on the magnitude of the load it bears and the deformation requirements. Ring springs are used in applications with limited space that require strong buffering.

H&K spring applications

Tension springs, also known as helical tension springs, generally have equal pitch and mostly circular cross-sections. They can be used in many occasions, such as production assembly, testing, R&D, and maintenance. Tension springs occupy an important position in the global market and are widely used in fields such as national defense, marine, computer, electronics, automotive, mold, medical, biochemistry, aerospace, railway, nuclear power, wind power, thermal power, engineering machinery, mining machinery, construction machinery, and elevators.

H&K spring materials

Disc springs are mostly manufactured from cold-rolled or hot-rolled strip steel, sheet metal, or forged blanks (forging ratio not less than 3). The materials commonly used are spring steels such as 60S2MA and 50CVA. For thicknesses less than 1.1, high-carbon steel can also be used. The performance requirements for disc spring materials are that, after heat treatment, they should have high ultimate strength, yield limit, elastic limit, and fatigue limit, while also requiring high impact toughness, plasticity, and the highest possible yield-to-tensile strength ratio. To meet these performance requirements, most domestic and international manufacturers use high-quality cold-rolled or hot-rolled steel strips or plates. For disc springs with a thickness greater than 6 mm, forged blanks are used, with the steel grades mainly being medium-carbon low-alloy spring steels (silicon-manganese or chromium-vanadium spring steels) and high-quality carbon spring steels. Due to the high silicon-manganese content and low chromium-vanadium availability in China, disc springs primarily use 60Si2MnA. Comparing the two, 50CrVA has better hardenability, temper stability, and impact toughness than 60Si2MnA, but 50CrVA is more expensive and suitable for applications with higher fatigue requirements.

H&K spring precautions

Due to product structure limitations, multi-strand springs generally feature high strength and good performance. The material must guarantee final performance in terms of spring strength and toughness. During the processing of multi-strand springs, note the following: 1. Support coils can be closed using either cold or hot closing methods according to product requirements. When using hot closing, do not heat the spring until sparks fly or it turns white; the temperature for silicon-manganese steel must not exceed 850℃. Support coils and active coils must have effective contact, and the gap must not exceed 10% of the nominal inter-coil gap. 2. The characteristics of multi-strand springs can be determined by adjusting the lead; the strand spacing can be adjusted as necessary during winding. The twist pitch can be 3~14 times the wire diameter, but 8~13 times is generally preferred. The spring force is also closely related to free height, closed ends, outer diameter, and wire properties, and can be changed by adjusting one or several of these parameters. 3. Springs without support coils and springs with excessively thin wire diameters should not have welded ends. However, the end strands should not be obviously loose, and burrs should be removed. For multi-strand springs requiring welded heads, the welding length should be less than 3 times the strand diameter (maximum not exceeding 10 mm). The heating length should be less than one coil. After welding, grind smooth. For gas welding, perform local low-temperature annealing on the welded area. 4. Spring surface treatment generally involves phosphating, but other treatments are also possible. If zinc or cadmium plating is required, perform hydrogen removal treatment after electroplating. After hydrogen removal, sample 3% (no fewer than 3 pieces) for retesting and presetting; no fractures should occur during retesting. Clean surface dirt, salt marks, and oxide scale from the springs using methods such as sand blasting or gasoline cleaning, but do not use acid pickling. 5. The compression time for important springs is 24 hours, and for ordinary springs, it is 6 hours or continuous compression 3~5 times, holding for 3~5 seconds each time. During compression, the gap between the spring and the mandrel should be 10% of the mandrel diameter. A gap that is too small makes operation difficult, while a gap that is too large easily causes bending deformation of the spring. If one spring breaks during compression, the others should be reprocessed.

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