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IMM Networking Forum
tung
Charter Member
2 posts |
09-26-07, 09:26 PM (GMT) |
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"injection molded 13" long tube can it be done?"
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I don't think this is currently possible, but maybe it is. Does any one know if a 12.75" long, thin wall (.020), 1/2" OD, hex shaped tube with two holes at both ends can be injection molded? The tube can be extruded and then second op the holes. I'm wondering if such a part can be made complete without second operations. I've never seen an injection molded tube that long. |
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dhoffman
Charter Member
375 posts |
10-28-07, 09:20 AM (GMT) |
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3. "RE: injection molded 13" long tube can it be done?"
In response to message #2
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Guten Tag!! I just saw this as I was checking the site waiting for the K-show to start, and I had to respond. There is someone here (I will have to find their booth) that is molding a similar shape I think (without the holes on the ends) that is about 4 foot long. The core slides down as the plastic is injected. They call it Extrusion-Injection I believe. So perhaps it could be done... I will post the name of the company info if I can get back to see it. Dave H. |
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Alexpeng
Charter Member
46 posts |
11-13-07, 07:36 AM (GMT) |
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4. "RE: injection molded 13" long tube can it be done?"
In response to message #0
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Hi All,
I think the extruding modling is the better solution for you parts. You only need a fixtures after you cut down a right length tube,then the part will be send to the fixture to drill holes.all of these operation can be automatice.If you want to mak a injection mold.it's easy. lie down the tube,then you need a slide for the inside hole.When open the mold,the part will be keeping in the slider pin,you can design a spring ejector on the slider,if you put the slider on the top side ,it can be fall down.We have experence in a similar part. Alex
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Dennis
Charter Member
1 posts |
04-16-08, 12:51 PM (GMT) |
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7. "RE: injection molded 13"
In response to message #0
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It may be possible to injection mold this, if the plastic can flow that distance. However, to remove it from the mold will require that the pressure of the shrinking part be relieved before it is stripped off, or the part will probably buckle, as the other responder suggested. To do this, one possibility would be split the core, essentially making two long lifters. The core could be made in three pieces that interlock like a jig-saw puzzle, with the middle blade tapered from top to bottom, small at the top, larger at the bottom. All three would have to be wire EDM'ed with a slip fit between them. The outer cores would be attached to a multi-stage ejector system, and the inner core would be stationary. After the outer cores move far enough forward to relieve pressure from the shrinking plastic, carrying the part with them, a stripper ring would come forward and easily slide the part off the core. Since the part is only 1/2" diameter, the core pieces will be quite thin. The part will need to be gated in at least two places on opposite sides, and the core will have to lock into the "A" side of the mold to keep it from moving during injection. This may work with low shrink materials, but high shrink would require too much taper, and the center blade could become too thin at the top. |
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