Questions You Should Know about High Temperature Disc Springs

• What is the difference between a disc spring DIN and a Belleville washer DIN?
• What is the useful life for a disc spring?
• Which is better, stainless steel material or anticorrosive coating?
• How long can disc springs stacks be?
• Do disc springs lose force over time?
• Which temperature range can a standard disc spring work within?
• Do elastic properties of disc springs vary depending on the material?
• Why do some disc springs last longer than others?
• What is the difference between flange washers and a disc spring DIN or Belleville (USA)?
• Do I have to use one or two disc springs for each bolt?
• Are flange disc springs manufactured in non-magnetic material?
• Which stainless steel should I use?
• What does mechanically Zinc Plate mean?
• What types of anti-corrosive protection are available for this type of elastic flange washers?
• How many times can a flange washer be used?

What is the difference between a disc spring and a belleville or pressure washer?

Disc springs are pieces manufactured for dynamic works. This is why the type of steel used and treatments they undergo during the manufacturing process are aimed at conferring elastic properties to be maintained over time. In contrast, pressure washers are pieces intended for static applications, requiring high resistance to compression while having a low recovery capacity for new compressions.

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What is the useful life for a disc spring?

The useful life of disc springs depends on various factors and cannot be precisely determined. However, estimates can assist in decision-making among several possible solutions for the same application. Factors such as work force, displacement, cycles endured, and environmental conditions (friction, temperature, corrosive factors) significantly influence this estimation. It's also important to note that only springs manufactured in compliance with standard (DIN) will last significantly longer due to better materials and thermal treatments.

Which is better, stainless steel material or anticorrosive coating?

Each option presents its advantages and drawbacks, and the best choice depends on the specific corrosive environment and usage. Generally, stainless steels provide superior resistance, but in specific cases, specialized coatings may perform better under high exposure to certain corrosive substances. Ultimately, a thorough analysis and consideration of factors like cost and delivery time are crucial.

How long can disc springs stacks be?

There is essentially no length limit on the stacks of disc springs, although longer stacks may increase the risk of buckling and friction within the guidance system. This can be mitigated through the use of separator flat washers, ideally placed so that the distance between them does not exceed three times the external diameter of the disc springs.

Do disc springs lose force over time?

Over time, disc springs under constant load can suffer relaxation, resulting in a force decrease. The initial loss tends to stabilize thereafter, with an estimate suggesting a 5% loss during the first two weeks. The quality of the material and manufacturing significantly affects this loss, making pre-setting treatment vital to ensure consistent performance.

Which temperature range can a standard disc spring work within?

The elasticity of disc springs is indeed temperature-dependent. For standard materials (e.g., ASTM 50CrV4), operational temperatures range from 120°F to 212°F. For extreme environments, disc springs made from high-temperature resistant materials like 17-7PH or Inconel 718 may be required, capable of operating in temperatures from -400°F to 600°F and -400°F to 1,250°F, respectively.

Do elastic properties of disc springs vary depending on the material?

Yes, the elasticity of disc springs can vary significantly based on the material used. When calculating stack performance, the specific material must be taken into consideration, as elasticity can also change with temperature.

Why do some disc springs last longer than others?

The quality of materials and the manufacturing process strongly impact the fatigue resistance and lifespan of disc springs. Standards like DIN define suitable steels, but not all manufacturers adhere to stringent quality controls, leading to variations in breakage rates. Superior thermal treatments and complementary processes (like shot peening) can enhance durability and elasticity.

What is the difference between flange washers and a disc spring DIN or Belleville (USA)?

Flange washers, a type of disc spring, differ mainly in the OD/ID ratio, which is about 1.75 for flange washers. This allows their use in settings with closely spaced bolts. Generally, flange washers exhibit greater force in a fully compressed position compared to other DIN options of the same outer diameter and thickness, tailored to meet typical force requirements in various applications.

Do I have to use one or two disc springs for each bolt?

This ultimately depends on the specific application. Typically, a single spring suffices, but applications with significant expansion forces may require two. Consultation with a technical department is advisable to determine the optimal number of springs needed.

Are flange disc springs manufactured in non-magnetic material?

Yes, materials like Inconel 718 and Inconel X750 are routinely used to fabricate non-magnetic flange disc springs.

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Which stainless steel should I use?

The suitable stainless steel varies by application. AISI 301 and 17-7PH are common options, with the latter providing better corrosion resistance at extreme temperatures. AISI 301 is economical but is less suitable for springs thicker than 0.1 inches due to its work-hardened state.

What does mechanically Zinc Plate mean?

This term refers to a method of applying zinc to disc springs for corrosion protection through a process involving rotation in a mixture of zinc and glass particles. This method effectively affixes zinc to the springs while minimizing the risk of hydrogen-induced fractures common with electroplating.

What types of anti-corrosive protection are available for this type of elastic flange washers?

In addition to zinc plating, additional protection methods include nickel plating, yellow chrome, phosphate coating, oil coating, among others.

How many times can a flange washer be used?

Flange washers can be used indefinitely if their usage falls within safe operating limits and no significant damage occurs. They may be compromised by excessive fatigue cycles, prolonged exposure to high temperatures, or harsh corrosive environments.

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