Faqs

Wire diameter d: The diameter of the steel wire determines strength and stiffness, and the larger the diameter, the stronger the bearing capacity.

Medium diameter: The average diameter of the spring coil, the smaller the medium diameter, the higher the stiffness, which affects the stress distribution.

Free length: The length when there is no load, which needs to match the installation space and working stroke.

Effective number of turns: The number of turns involved in deformation, the more turns there are, the lower the stiffness and the greater the deformation.

Pitch: The axial distance between adjacent coils, and the compression spring should avoid interference between coils due to a too small pitch.

Spiral angle: usually 5 °~ 9 °, affecting force stability.

End structure: The end face treatment of compression springs and the hook and loop design of tension springs are related to installation reliability.

The ideal materials for high-temperature springs need to balance heat resistance and mechanical stability. Nickel based alloys (such as Inconel 718) and cobalt based alloys (such as Stellite 6) are preferred, with an oxidation resistance temperature of over 650 ℃ and excellent creep resistance. Next is austenitic stainless steel (such as 316L), which has a temperature resistance of about 450 ℃ and is suitable for medium temperature conditions; Titanium alloys (such as Ti-6Al-4V) have both lightweight and corrosion resistance in high-temperature environments below 300 ℃. The selection of materials should be comprehensively judged based on temperature, load, and environmental medium.

Stainless steel is more suitable for industrial scenarios due to its strong corrosion resistance and chemical resistance. Although carbon steel has high strength and natural magnetism, it is prone to rusting and corrosion in humid environments. Stainless steel can enhance its magnetic properties through cold processing, while maintaining stable performance in complex working conditions with an alloy passivation film, making it more adaptable than carbon steel.

Stainless steel springs have excellent corrosion resistance and aesthetics. Compared to carbon steel springs, they have stronger corrosion resistance and can maintain performance in humid, acidic, and alkaline environments. They also have good high temperature resistance and oxidation resistance, making them suitable for precision fields such as medical and food.

 

MSJ Spring provides multi-dimensional anti-corrosion solutions. Coating protection: Contains GM III certified electrostatic powder epoxy resin/polyester coating (salt spray resistance ≥ 1000 hours), and wet spray painting process (supports color coding and RAL color card customization). Electroplating and composite treatment: With the cooperation of the supply chain, electroplating services such as galvanizing (trivalent chromium passivation) and nickel plating can be achieved. Combined with composite systems such as zinc chromium coating (Dacromet), the salt spray resistance can reach more than 2000 hours. Temporary protection: Always keep oil-based/water-based rust inhibitors, suitable for long-term storage for 6-12 months and short-term transportation protection for 1-3 months, and provide rust proof packaging.

MSJ Spring  provides spring material solutions covering all application scenarios. Standard materials such as carbon steel (such as 65Mn), spring steel (60Si2Mn, 50CrVA), and stainless steel (304, 316L) can be used in conventional fields to meet the conventional load requirements of industries such as automotive and electronics. In terms of high-end applications, some technology centers have application experience in titanium alloys (TC4), nickel based alloys (Inconel 718), beryllium copper (C17200), and special high-temperature alloys (Hastelloy X), which are suitable for harsh working conditions such as aerospace and high-temperature corrosion resistance.

d - wire diameter

D - mean diameter, the diameter of the spring as measured at the wire centerline

ID - inside diameter, D-d

OD - outside diameter, D+d

Na - number of active coils

Nt - total coils, active coils plus any inactive coils. For a spring with closed ends, Nt=Na+2

FL - free length, the spring length with no load applied

P, F - load or force, the force exerted by the spring under a given deflection

L - instantaneous spring length, the spring length corresponding to a given applied load

x, s - instantaneous deflection, the amount the spring is compressed from free length to length l. x=FL-l

K - spring rate, the derivative of the load-deflection curve. k=P/x=(P2-P1)/(l1-l2)=(P2-P1)/(x2-x1)

C - spring index, the ratio of the mean diameter to the wire diameter. C=D/d

We use standard methods that comply with SAE and SMI industry guidelines to systematically analyze the fatigue life of springs. The core process is to first calculate the minimum and maximum stresses of the spring in its working state, and then compare and analyze them with the Goodman diagram modified in multiple dimensions. It should be emphasized that the verification of fatigue life capability needs to be based on experimental data. Especially when the spring structure design is unconventional or non-standard special materials are used, experimental verification is particularly crucial. In such special scenarios, MSJ Spring will use reliability engineering technology to customize the development of testing plans. We conduct in-depth analysis of test data to ensure that product performance not only meets customer technical specifications, but also exceeds the expected lifespan.