aluminium and self-forming screws

[opua]

Hello everyone, a curiosity: on an aluminium object, can the thread be made only by means of self-forming screws or by means of chains? Finally, a self-forming screw can also be applied to a hole obtained by die casting (so with conical profile due to the sform) or should it be worked in any case?
Thank you.

 

[Fulvio Romano]

Hello everyone, a curiosity: on an aluminium object, can the thread be made only by means of self-forming screws or by means of chains? Finally, a self-forming screw can also be applied to a hole obtained by die casting (so with conical profile due to the sform) or should it be worked in any case?
Thank you.

steel wires are also good for aluminum, and this is threaded. of course do not file with a chain if you want to use an autoflowering, because the thread is different.. .

in principle it is better to fill a cylindrical hole. but if you have a slightly conical hole and the chain comes to the bottom without effort, why not. at the end the thread will be cylindrical anyway.

 

[opua]

steel wires are also good for aluminum, and this is threaded. of course do not file with a chain if you want to use an autoflowering, because the thread is different.. .

in principle it is better to fill a cylindrical hole. but if you have a slightly conical hole and the chain comes to the bottom without effort, why not. at the end the thread will be cylindrical anyway.

hello and thanks for the answer, but according to you why sometimes you use autoforming screws that have a different thread, if we can file with the normal chains and then use a normal screw?

 

[SHIREN]

♪
Excuse me, maybe we're talking about males to filet
perhaps for holes are more appropriate
the supply chains sevono to filetta "cilindri"
to fill in the alumina are on the market both atofilettanti screws that also make the pre-light
both males and with air equipment (manual) do the same work (oven and fillet)
for diefusions there is no prob for conicitis
Just a few 0.1 mm of conicitis on the side!
entering the drilling tolerance
I wish you a good Sunday

 

[Therapy?]

the self-forming screws are used instead of the metrics to not have to make the thread first on the piece (imagine of having to assemble thousands of pieces per day having to first make a thread passage of the holes)

in my company are used in many applications both on sheet metal and on die-cast aluminium (holes with sform)

in the office I have a table of the taptite in which all possible applications and pre-holes are indicated in any case (e.g.: perforated holes on sheet, drill holes, casting holes etc.) if you need I can send it tomorrow otherwise you can try to do a search on the internet
Hi.

 

[opua]

Forgive me all but, I have not understood 2 things: for aluminum threads must be made with autoforming screws, or can we fill normally with the chains as for steel? Finally the thread you get with a self-forming is different from that metric? if so it is not likely to find on aluminum components assemblies with metric screws?

 

[Fulvio Romano]

♪
Excuse me, maybe we're talking about males to filet
perhaps for holes are more appropriate
the supply chains sevono to filetta "cilindri"

Yes shiren, I fell, too....

to fill in the alumina are on the market both atofilettanti screws that also make the pre-light
both males and with air equipment (manual) do the same work (oven and fillet)
for diefusions there is no prob for conicitis
Just a few 0.1 mm of conicitis on the side!
entering the drilling tolerance

0.1mm on what length?
on small surfaces, for fiberglass you usually have 1.5° - 2nd...

 

[Fulvio Romano]

Forgive me all but, I have not understood 2 things: for aluminum threads must be made with autoforming screws, or can we fill normally with the chains as for steel? Finally the thread you get with a self-forming is different from that metric? if so it is not likely to find on aluminum components assemblies with metric screws?

aluminum can fill it with a self-tapping or a male to fill it.
in the first case, you can only use self-tapping screws
in the second case, you can only use metric screws (if you have threaded with a metric)

I didn't understand the rest of the doubt from where it came from. Why should it be unlikely? I have seen almost exclusively aluminum pieces with metric threads.

 

[fischer]

I add further information: it is necessary to distinguish between self-tapping and self-forming.

autoforming (other than self-tapping) form the plastic deformation thread and the same thread can then be used by metric screws (in case a repair should be made, for example). they differ from the self-tapping as they have a different profile (they are not trilobed) and therefore they take over all the circumference of the thread, not only in three portions.
if you need more detailed information consult the ejot catalog (I don't know if there are other companies producing autoforming machines)

Hi.

 

[JonnyBravo86]

hello to all, I am using self-forming screws on aluminum jets, in conical holes as from specific screws. the created step is compatible with iso metric screws.
is it indifferent to you if the hole is painted before the application of the screws?
Thank you.

 

[meccanicamg]

you should know that according to the customer's specification or regulatory decisions. paint creates thickness and definitely grip if first paints. then what paint is aesthetic? anti-corrosive? food jets? Oil? explains more