Xiamen Shuangyuan Springs Co., Ltd 'Blog

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Piston Return Disc Springs

manufactures top of the line disc springs or disc spring stacks used in piston return springs. Tolerance stack ups and component wear are compensated for by the flat load characteristic in the springs operating range. They will return a hydraulically actuated piston to its original position after hydraulic pressure is released.  The use of disc springs results in consistently smooth shifting.   


Spring Actuated Brakes

 disc springs are often used in spring-actuated brakes. The springs are used as a fail-safe braking mechanism and actuate under the circumstance of power loss in the system. The springs are compressed under normal operation of the equipment, leaving the break open. In the event of power lost the spring stack will release and activate the break. 


Disc Spring-Corrosion Protection

 disc springs are capable of enduring rigorous loads at very high stress levels. In addition, the table details their respective process and comparative corrosion resistance when exposed to a salt spray test per the requirements of DIN 50 021.At such levels, it is very critical to protect the disc springs from chemical or electrochemical corrosion. Please reference for a list of corrosion resistant surface coatings.  Some disc spring applications require thicker surface coatings, For example, it is possible to achieve a surface coating thickness up to 50 μm with mechanical galvanizing and chemical nickel-plating. The surface coating thickness listed in the table for galvanizing and nickel-plating are illustration of realistic protection values. When designing disc springs stacks, lateral surface issues with the coatings are possible where relative movement between the springs may occur.


High Temperature Disc Springs

High Temperature Materials

Disc springs functioning at high temperatures use a variety of precipitation-hardened materials from the nickel-base alloys group. The high temperature materials are vastly ductile and exhibit very high fatigue strength. The lower tensile strength and adverse elastic limit – tensile strength ratio are important when designing disc springs made of high temperature material. If ignored, a high degree of setting loss is potential. An upper operating temperature limit is not viable to indicate and the overall spring height lessens under load due to creep. The tangible level of creep is a function of temperature, time and stress. For example, a disc spring can be used at higher temperatures if either a lower load is applied or the duration at the higher temperature is minimal. As a result, the values are valuable references for the maximum temperatures at which the disc springs will demonstrate the same performance as at room temperature. The modulus of elasticity is somewhat lower at the upper temperature limit of the material. Therefore, disc springs produced with thermally stable materials can be used at temperatures approximately 150 °C higher than those acknowledged . High temperature materials generally have long lead times from the steel mills and are typically very expensive. Nimonic 90 is better suited for extremely high temperatures than Inconel X 750 (or Inconel 718).


Antimagnetic Disc Springs

Antimagnetic Materials

Precipitation hardening supplies the strength to these non-magnetic and corrosion-resistant disc spring materials.


Thermally Stable Disc Springs

Martempered steels are generally thermally stable disc spring materials due to their high alloy content. The thermally stable disc spring material was exposed to high temperatures for a long length of time in order to obtain the higher operating temperatures . In contrast to standard disc spring materials, martempered steels display a lower level of creep at the higher temperature ranges.  The modulus of elasticity is very critical during disc spring design, since it decreases as the temperature ascends and increases as the temperature descends.In addition, the disc springs may be exposed, for brief moments (roughly about 1 hour), to temperatures approximately 100 °C higher than those listed without disturbing their properties. Hence, disc springs will exhibit a lower force at greater than room temperatures and a higher force at lesser than room temperatures. Brittle fracture is probable during untimely failures for disc springs manufactured with thermally stable materials.


Corrosion Resistant Disc Springs

Corrosion Resistant Materials
A disc spring material with a high nickel alloy content is considered corrosion-resistant due to the austenitic crystal lattice in its original state. The mixed crystal formation provides the strength in corrosion resistant disc spring material, along with cold working during rolling (see DIN 17 224) and precipitation hardening (X 7 CrNiAl 17 7). The corrosion resistant material is unable to be martempered or austempered like standard disc spring materials. The maximum disc spring material thickness has narrow limits set due to the certain degree of cold working the material. In addition, the strength acquired by cold rolling is lost at temperatures above + 200 °C, but use of corrosion resistant disc spring materials at extremely low temperatures is achievable.


Economical solutions for less critical applications

Belleville washers, manufactured from steel strip, are not scragged (pre-stressed) during the manufacturing process and the inside and outside diameters of the disc spring are not machined.

Belleville washers are a more economical and less precise form of conical disc spring, best used for static applications where some setting and/or loss of force can be tolerated.


Frequently Asked Questions About Disc Springs

Do the inside and outside dimensions change under compression?

Yes, the dimensions of disc springs do change under compression but as long as the recommended guide clearance is applied, it will not cause any problems.


Surface Treatments For Disc Springs

We have chosen to list below some of the most commonly requested finishes, if however the finish you are considering is not listed, please call us to discuss your requirements.

Introduction to Protective Treatments
There is currently an almost endless choice of surface treatments available to protect components against numerous working conditions.




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Xiamen Shuangyuan Springs Co., Ltd copy right @2006-2008     Address: No.177, Xisanli, Jinshan, Huli, Xiamen, China
Tel: +86(592)5254186   +86(592)5289710       Fax: +86(592)5513310
Email: shuangyuan@springinchina.com    rosecn888@gmail.com
China manufacturer of gas spring,disc spring,die spring,lockable gas spring and compression spring