When you are selecting for a washer, you should evaluate what is the best one for a particular application. Remember that accurate assembly can lead to success and can minimise machine downtime. Washers have a vital role because it secures the fasteners (like bolts, nuts, screws, and rivets) as well as seal, improves appearance and distributes loads.
For many applications that need to absorb intermittent shock loads and maintain assembly tension, spring washers are considered because of its mechanical capabilities. It has irregularities that if compressed with enough resistance, it will return to their original shape. The production methods executed by metal washer supplier include stamping, machining, hot treatment, rolling or any combination of these.
There are many types of spring washers like Belleville, dome, crescent, wave, first wave, and finger. The most common is the Belleville spring washer that has the capacity to support high loads with minor deflections. In terms of load types, it can be dynamic or static. Dynamic load should not exceed the yield limit. The static load is known to have an elastic load rating, which the washer material can exceed.
When selecting the right spring washer, you have to consider specifications. Specifications are as follows:
The dimension should be considered for a successful implementation. Diameter includes the Outer Diameter (OD), Inner Diameter (ID), Diameter Across Slots (DAS), Diameter of Center Rotation (DCR), Cone Height (CH), Plate Thickness (T) and washer envelope. If you are new to this, perhaps you just need to know about the OD and ID first. OD refers to the straight-line size across the edges of the washer. The ID refers to the width of the bored hole.
Spring washer material
The material should provide the best tensile strength and elastic limits. To forecast the load of the material and deflection capability, Young’s Modulus can be used. Spring washers are metallic. It can be steel, copper alloy or a nickel-chrome alloy. The most common material is steel. It is valued because of its intense tensile strength.
Spring rate and force
When you hear about the spring rate, it means the amount of load required to move the spring to a predestined distance. Spring force, on the other hand, is the measurement of the resisting pressure that resulted from compressing the spring washer.
Friction and lubrication
In spring washers, friction has different sources. It can be from the deformation of the material in every deflection or the abrasion of washers when stacked parallel. Lubrication is critical for spring washers. For washers with a protective coating, it still needs care to maintain its condition. Oil is the most common lubricant and it should be covered generously.
Spring washer hardening
To facilitate strengthening the steel, isothermal annealing is used. For washers with dynamic load, shot peening is used to improve the fatigue life.
Spring washer environment
You have to remember that when the temperature rises, the load capacity and elasticity of the material decreases. The environment plays a vital role in the life of washer. Non-steel spring washers will produce corrosion. In this case, it is crucial that you need corrosion-resistant washers.