|
|  |
Secondary Operations:
Heat Staking of Eastman Polymers
Critical Constraints
- Do not use heat 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
- Heat staking has been shown to provide equal or greater strength as compared to ultrasonic staking.
- Begin with a temperature 100ºC below the melting point of the polymer, increasing it in 10º increments until the head is optimized.
- 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.
- It is possible to stake several posts at one time with proper horn design and hot staking conditions.
|
