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5th November 2019, 04:51 PM
#1
molding with electrical pins
Hi everyone The part we make has 3 brass pins in a socket that a cord plugs into and we have to leak test every one with 10 psi of air and were getting a good amount that are leaking my question is is it possible to get 100 percent seal around pins? We are using rtp 199x and rtp 1005 any help or advice would be appreciated thank you
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5th November 2019, 08:50 PM
#2
Re: molding with electrical pins
Has the number of leaking parts always been consistent, or has it recently gone up? Is there a process in order to clean the pins prior to molding around them? If the pins are clean and free of oil or other contraband, it should mold without leaks.
However, there's a lot of missing pieces. What type of pins? Are they specifically for over molding? Are you drying the material to be sure there's no moisture? Just trying to think of reasons why the bond would be good on some and not others.
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7th November 2019, 08:48 AM
#3
Re: molding with electrical pins
This is interesting, do you have some pictures whats about?
How the fault looks like, material grade filler %, tool, etc.
J.
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9th November 2019, 08:42 PM
#4
Re: molding with electrical pins
So you didn’t mention it but I think you’d be better off preheating the inserts too. The inserts can freeze the melt before it can completely flow around the pin. Also ensure you have great venting around the inserts.
Are the inserts treated to ensure bonding to the resin? If not you’ll have to rely on mechanical bonding and that may require several changes to work properly.
Rick.
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11th November 2019, 08:56 PM
#5
Re: molding with electrical pins
picture of the parts
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18th November 2019, 06:46 PM
#6
Re: molding with electrical pins
How does your process compare against the material vendors recommendations? Are you hand loading the pins? Is the mold hot?
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