In this brief we will show in our technical opinion in how to proceed the correct rubber cushion design and application in general industries.

Rubber cushions are used in almost all industries considering its versatility in any application to avoid vibrations and impacts, we from RISASPRINGS develop in our laboratory the rubber formulation seeking the best and most modern rubber materials, we also realize static analysis and chemical in our manufacturing facility.

To a correct rubber cushion design what should be considered:

DYNAMIC STIFFNESS – The rubbers when applied vibrations, they will respond in according this frequency and loading application speed.

ELASTOMER BASE – Another important condition to rubber cushion application is know wjat elastomer as base in use (neoprene, nitrile, natural) will provide a more damping response or vibration isolation (it will depend the project requirement).

ELASTOMER NATURAL FREQUENCY – The rubber in cushions will usually be in the range 6,0 to 12Hz.

METAL-ELASTOMER BONDING – Nowadays the bonding technology between a steel plate and rubber had a great evolution, and we can adopt special bonding materials in according the project request.

STOP CUSHIONS DESIGN – Usually the use of cushions stops are considered useful to protect equipments and structures against impacts, the correct design are made following the described steps: check the displacing mass – check impact speed – design the impact transmission time considering the required transmitted force – with this force we know the first data to design the rubber cushion – check speed and frequency of the force application – natural frequency design – select the cushion or stop to be used.

ACOUSTIC – Several cushions are used to control vibrations and impacts in acoustic applications, in recording rooms and acoustic environments, we develop a specific rubber composition to each project request.

GENERAL DATA APPLIED TO INDUSTRIAL RUBBER CUSHIONS – Damping factor (c/cc): ethylene butadiene = 0,051 to 0,149 // methyl butadiene = 0,029 to 0,079 // polychloroprene = 0,03 to 0,79 // butyl = 0,049 to 0,489.

tabela dimensional de coxins risasprings

Obs.: With the information “c/cc” we can choose the elastomer composite in the graphic area below considering the transmissibility (stiffness, damping or mass).

gráfico de transmissibilidade
Source: Instituto Tecnológico da Aeronáutica