Waveform SPRING

One day,i need add a waveform spring to my product,but i can't found a exist model from my deisgn database,so i have to model it by myself,and i found it's not that easy,i took almost 1hour to think about how to do it ,any try several times to finish it,fortunately,i found a method to solve the problem. you can download the model,and change the formula parameters to fit your need. if you have any question ,comment in the below,i will answer that ASAP.