Seamless Bellows Production Process

Our metal bellows are produced using a multi-step manufacturing process. Here's an overview of the basic process, but keep in mind that there are many variations related to material and design requirements. For example, the stabilization annealing time, temperature and atmosphere are heavily dependent on the material.

Step 1


A flat metal strip is punched into circular disks.
Seamless Bellows Production Process Step 1
Step 2

The disks are formed into small cups. Then, these cups are degreased in a modern washing bay and annealed in a vacuum. furnace.
Seamless Bellows Production Process Step 2
Step 3

A series of long draws transforms the cup into a seamless, closed-end tube of the highest quality.
Seamless Bellows Production Process Step 3
Step 4

While in the forming die, 1500psi of water pressurizes the inside of the tube as it is compressed, creating the corrugations.
Seamless Bellows Production Process Step 4
Step 5

The bellows are trimmed to size.
Seamless Bellows Production Process Step 5
Step 6

A final compression stage sets the bellows and gives it spring-like characteristics.
Seamless Bellows Production Process Step 6