×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Joining mixed material extrusion

Joining mixed material extrusion

Joining mixed material extrusion

(OP)
Hi All,

Back seeking some advice regarding joining a mixed material extrusion. The profile is basically a boot/door seal design with a sponge bulb on a plastic (so our lab tells me) covered metal carrier.

We have had some issue with the joining of this process, the customer has requested the parts to be glued rather than joined with Normec film. The profile is more are than material (bulb is only 2mm thick and the carrier is about 2mm with 4 small limbs to retain profile in situ).

Initial problems were caused by the cutting process crushing the carrier part of the profile. On review we identified the optimum position to cut (between the metal carrier). The current issue relates to splits at the joint, we are using Loctite 424 as an adhesive.

Any advice on the best way to cut/join these? I would like to go down the Normec route but believe we will need lower temperatures and longer cure times than we do for our dense rubber profiles.

Our Normecs are single head machines, however I have seen a carousel of neads used to good effect in the past.

Thanks
 

RE: Joining mixed material extrusion

I assume you are using a shear to cut, and the parts are splitting (adhesive failing) near the cut line.  Have you tried an abrasive cut-off wheel?

Hmm, after googling the brand name, it looks like they offer a diamond (abrasive) cutting wheel in addition to a guillotine/knife shear.  Which are you using?

Loctite fails beautifully (easily) in shear (we used to use it to attach accelerometers to vibration test units, as you could remove the accel block with a sharp sideways rap with a wooden dowel), and may not be a good choice for this bonding.  Something like a 3M acrylic tape might be a better choice (it's a more malleable/flexible adhesive), but it sounds like your customer doesn't like this for some reason?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources