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Secondary Operations:
Ultrasonic Staking of Eastman Polymers
Staking Post Configuration
Critical Constraints
- Do not use ultrasonic staking to bond components with similar melting points.
- A button type head should be used to provide maximum strength.
- Place a radius at the base of the staking post to reduce stress concentration factors. If the mating piece does not allow room for a filleted radius, consider the use of a recessed radius.
Notes
- Use the vibration energy of the ultrasonic welding machine to melt the plastic and use pressure to properly deform the stud.
- Coating the staking horn with a low friction coating such as tungsten disulfide will reduce sticking of the melted plastic to the steel and allow a wider staking window.
- The optimum staking conditions should be dialed in until a proper head is formed. It is possible to stake several posts at one time with proper horn design and ultrasonic conditions.
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