Heat / Utrasonic Staking
Heat / Utrasonic Staking
(OP)
Hi,
Does anyone know of any technical information about heat / utrasonic staking for joining a plastic injection mouldedpart to a sheet metal part. I want to use one of these processes to avoid using screws but I have found very little technical information. I would like to know what are the pros and cons of the two processes. Specifically: restrictions in terms of head size, clearance for horn diameter, cycle time. Is it possible to make multiple stakes at the same time or are they made individually? etc..
I would be grateful for any feedback.
best regards
Matt
Does anyone know of any technical information about heat / utrasonic staking for joining a plastic injection mouldedpart to a sheet metal part. I want to use one of these processes to avoid using screws but I have found very little technical information. I would like to know what are the pros and cons of the two processes. Specifically: restrictions in terms of head size, clearance for horn diameter, cycle time. Is it possible to make multiple stakes at the same time or are they made individually? etc..
I would be grateful for any feedback.
best regards
Matt





RE: Heat / Utrasonic Staking
RE: Heat / Utrasonic Staking
Both methods can be employed with most plastics.
Companies like Branson should be able to help with more details on ultrasonics.
A simple press with a heated plate with projections to match the moulded pegs should make heat staking a one step process.
It will depend on the polymer, and accurate control of the heat at each stake will be required to get enough melting without sticking.
Regards
pat pprimmer@acay.com.au
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RE: Heat / Utrasonic Staking
Heat Staking is usually a simpler method of joining parts such as yours. Ultrasonic welding is better suited to plastic-plastic applications where an energy director is designed into the part.
The cycle times are similar and with heat staking you can stake multiple posts at one time.
The key to proper, consistant staking is to have precise control over all machine parameters. (The more demanding the application, the better control required)
The resin suppliers should always be consulted to prevent strength and other properties from being affected by the reheating and cooling of the plastic.
Cheers,
Ken
RE: Heat / Utrasonic Staking
ChemE, M.E. EIT
"The only constant in life is change." -Bruce Lee
RE: Heat / Utrasonic Staking
Cheers,
Ken