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| Joining methods of sheetmetal and plastic |  |  | |
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| Posted by: rikas ® 10/26/2009, 01:32:40 Author Profile eMail author Edit |
Hello all, I need to design a economical, robust joint between a sheetmetal of thickness 2.5 mm with a plastic part of wall thickness 2.5 mm. I am trying to collect what are all the joining techniques, elements have been known so far in this industry.. Can you help in this? whatever info regarding this would be helpful.... |
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| Posted by: SIVA_KOVAI ® 11/04/2009, 06:28:24 Author Profile eMail author Edit |
Hi, U can go for Insert moulding. The sheet metal part should be fabricated first, then the plastic component can be moulded with these sheet metal insert. SIVA Modified by SIVA_KOVAI at Wed, Nov 04, 2009, 06:31:29 |
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Posted by: devitg ®  11/04/2009, 08:03:55 Author Profile eMail author Edit |
You can ACTIVATE plastic surface by a blue colored flame, to make it opaque.
It is usually done to print plastics. Then join with epoxy or cianoacrilate.
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| Posted by: rikas ® 10/27/2009, 05:21:35 Author Profile eMail author Edit |
Hello Marky, Please, find the sketch in the attachment. I have sketched the geometry of the parts and how one has to be assembled to the other. I expect joining methods of that sheetmetal part with that plastic part.. Please, ask me if you see any ambiguity in understanding the sketch..
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| Posted by: Kelly Bramble ® 11/02/2009, 10:55:18 Author Profile eMail author Edit |
Have you considered snap-fit features? See: http://www.engineersedge.com/snap_fit_tapered.htm http://www.engineersedge.com/snap_fit_straight.htm
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| Posted by: AVIB ® 10/27/2009, 15:33:38 Author Profile eMail author Edit |
Hi,
Looking at your sketch , I would recomend Plastic Rivets . On each face of the alum. part and plastic part drill holes and use plastic rivets that can be found : Richco , Micro plastics , Skiffy , kang Yang . Can you tell us what kind of plastic ? There are some plastics that are problematic to adhare . another solution is to use alum. pop rivets which are more decorative nowadays . AVIB |
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| Posted by: rikas ® 10/28/2009, 06:08:21 Author Profile eMail author Edit |
Hi AVIB,
Plastic part's material is Polypropylene. Since, the sheetmetal part should expose outside (aesthetics), use of rivets, screws will not be good.. If i am going to crimp the sheetmetal with the plastic part around some portions of edges, what would you say?? will there be surface damage?? Whether a labor with a crimp tool can do that? Or we need a automated machine to do that? |
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| Posted by: AVIB ® 11/02/2009, 11:36:17 Author Profile eMail author Edit |
Hi Rikas ,
I have come up with elegant solution for you . Use double sided adhesive tape : 3M 467MP Let me know if it is ok Good Luck, AVIB |
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| Posted by: Marky ® 11/02/2009, 11:41:55 Author Profile eMail author Edit |
AVIB....thank you for the efforts that you have given to Rikas and this post. |
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| Posted by: AVIB ® 11/02/2009, 11:47:57 Author Profile eMail author Edit |
No problem .
Hope it helps . AVIB |
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| Posted by: AVIB ® 11/02/2009, 10:48:05 Author Profile eMail author Edit |
Hi Rikas ,
1- The Plastic u are using is problematic with adhesives . 1.1 U will need primer and adhesive and it is very problematic . 2-I have made a model of the plastic part and the 680mm' LNG. Dim. is bad news . the metal will bow along this line. 3- I do not see any solution without some kind of hardware . 4- After stating the above , I think u should use some decorative rivets . 5-Regarding crimping: This procedure will damage the surface of the metal . Sorry for this , AVIB |
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| Posted by: rikas ® 11/04/2009, 05:38:51 Author Profile eMail author Edit |
Hello AVIB,
Double sided tape is a good option. i have been looking at 3M VHB also. i will also look into 3M 467 MP. yes, seaming would damage the surface. Apart from these, i have been looking at also insert molding by providing some tabs, flanges and bending it, hemming, knurling the inner surface of the sheetmetal part. When we going for adhesives and adhesive tapes,as you said,
Modified by rikas at Wed, Nov 04, 2009, 05:39:36 |
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| Posted by: Marky ® 10/27/2009, 07:29:43 Author Profile eMail author Edit |
This looks pretty good...if this is going to be a production part (Several hundred pieces/yr) one place I would start is go back to who ever is doing the injection molded part and see if they can mold the plastic part onto the alum part. That process is sometimes called an "Overmold" where one part is molded over another. Now...if the part is decorative...now real mechanical function you could use adhesives and plastic rivet type fastener. Adhesive and a thread forming screw would work here...not sure of your quantities and what the parts does. I wouldn't do it in high quantities. |
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| Posted by: rikas ® 10/27/2009, 08:26:28 Author Profile eMail author Edit |
good marky..As this is decorative part, it cannot be over molded..surely, adhesive is main thing i thought...i give second preference to use of additional fastening member...
How about crimping (folding the sheetmetal over the edge of the plastic part) all around?? And also, what kind of adhesive you would suggest? |
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| Posted by: Marky ® 10/27/2009, 09:16:47 Author Profile eMail author Edit |
Just a standard construction adhesive would probably work. If you look at how your car is built...the dashboard and other cosmetic areas use push type rivets. You want to keep labor and costs down so extra operations like crimping are not feasible. Keep in mind that you may want to build some prototypes using various adhesives and rivet types. |
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| Posted by: rikas ® 10/27/2009, 05:17:10 Author Profile eMail author Edit |
Hello Marky, Please, find the sketch in the attachment. I have sketched the geometry of the parts and how one has to be assembled to the other. I expect joining methods of that sheetmetal part with that plastic part.. Please, ask me if you see any ambiguity in understanding the sketch.. |
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