Tubing expander constrained expanding (Pat. Pending)
The EBD process involves injecting hot air into the constraining glass tube to act as an air bearing and keep the tubing from sticking. Some of the important parameters are:
1. Balancing the externally injected air pressure with the internal expansion air.
2. Controlling injected air temperature so that it maintains the expansion process.
3. Adjusting the pressure and temperature in multiple injection areas to maintain the process flow.
4. Connecting the system of pressure, temperature, flow rate and line speed controls to keep the processes moving at production speeds.
This process has been made to work on an expanding machine using manual controls. Constantly adjusting several independent temperature controllers, flow controllers, pressure regulators and line speed can be made to work up to about 1 foot per minute (FPM). Production rate using silicone oil is expected to be around 10 FPM, so automated controls are needed to make this a useful process.
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EBD has a solution for both types of expansion. Our modular tooling allows for multiple of expanded tube sizes to be run on the same machine. Just let us know what you need!