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Posted by N_Cook on June 1, 2008, 3:50 am
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What would this process be called?
Aluminium heatsink used for mounting electronic components to , to conduct
away heat to the air . Some sort of chisell cutting advance and repeat while
still hot after casting/extruding?, surely not done cold?
http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink.jpg
a steel rule laid across it,
plus a close up showing the slightly angled cuts
http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink2.jpg
The remaining uncut spine is about 4mm wide and the original bulk of metal
must have been about 9mm wide to be cut down, each side, to a 4mm spine.
--
General electronic repairs, most things repaired, other than TVs and PCs
http://www.divdev.fsnet.co.uk/repairs.htm
Diverse Devices, Southampton, England
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Posted by John R. Carroll on June 1, 2008, 3:56 am
Please log in for more thread options N_Cook wrote:
> What would this process be called?
> Aluminium heatsink used for mounting electronic components to , to
> conduct away heat to the air . Some sort of chisell cutting advance
> and repeat while still hot after casting/extruding?, surely not done
> cold?
>
> http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink.jpg
> a steel rule laid across it,
> plus a close up showing the slightly angled cuts
> http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink2.jpg
>
> The remaining uncut spine is about 4mm wide and the original bulk of
> metal must have been about 9mm wide to be cut down, each side, to a
> 4mm spine.
Milled from both sides simultaneously with gang tooling and then formed.
Small stuff like this is also frequently sintered metal.
--
John R. Carroll
www.machiningsolution.com
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Posted by N_Cook on June 1, 2008, 4:18 am
Please log in for more thread options > N_Cook wrote:
> > What would this process be called?
> > Aluminium heatsink used for mounting electronic components to , to
> > conduct away heat to the air . Some sort of chisell cutting advance
> > and repeat while still hot after casting/extruding?, surely not done
> > cold?
> >
> > http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink.jpg
> > a steel rule laid across it,
> > plus a close up showing the slightly angled cuts
> > http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink2.jpg
> >
> > The remaining uncut spine is about 4mm wide and the original bulk of
> > metal must have been about 9mm wide to be cut down, each side, to a
> > 4mm spine.
>
> Milled from both sides simultaneously with gang tooling and then formed.
> Small stuff like this is also frequently sintered metal.
>
> --
>
> John R. Carroll
> www.machiningsolution.com
>
>
The fins are only 0.7mm thick and no sign of machining marks just a slightly
granualar looking surface on the concave side of each vane and a smooth
surface on the convex side.
I don't see how a milling process can be involved.
Are you saying the original bulk would have been about 4 + (2x27mm ) wide ?
, the fins are about 27mm along the curve.
A milling process would not leave those 5 degree or so off axis cuts along
the spine.
--
General electronic repairs, most things repaired, other than TVs and PCs
http://www.divdev.fsnet.co.uk/repairs.htm
Diverse Devices, Southampton, England
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Posted by John R. Carroll on June 1, 2008, 4:33 am
Please log in for more thread options N_Cook wrote:
>> N_Cook wrote:
>>> What would this process be called?
>>> Aluminium heatsink used for mounting electronic components to , to
>>> conduct away heat to the air . Some sort of chisell cutting advance
>>> and repeat while still hot after casting/extruding?, surely not done
>>> cold?
>>>
>>> http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink.jpg
>>> a steel rule laid across it,
>>> plus a close up showing the slightly angled cuts
>>> http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink2.jpg
>>>
>>> The remaining uncut spine is about 4mm wide and the original bulk of
>>> metal must have been about 9mm wide to be cut down, each side, to a
>>> 4mm spine.
>>
>> Milled from both sides simultaneously with gang tooling and then
>> formed. Small stuff like this is also frequently sintered metal.
>>
>> --
>>
>> John R. Carroll
>> www.machiningsolution.com
>>
>>
>
> The fins are only 0.7mm thick and no sign of machining marks just a
> slightly granualar looking surface on the concave side of each vane
> and a smooth surface on the convex side.
Yeah, they are milled straight and then roll formed in place. Bar stock is
pulled through a machine that does both sides and both operations at the
same time.
> I don't see how a milling process can be involved.
> Are you saying the original bulk would have been about 4 + (2x27mm )
> wide ? , the fins are about 27mm along the curve.
> A milling process would not leave those 5 degree or so off axis cuts
> along the spine.
Sure it would. You form grind the tools/cutters and gang them on an arbor.
You are thinking of this as a milling operation done vertically from the
top. It isn't. It's done horizontally with multiple cutters on an upper and
lower arbor as a long length of stock is pulled through.
I didn't see a ground plane on the heat sink but if there is one it's bonded
after the long bar has been cut to individual lengths and in a furnace.
Like I said, a lot of this stuf is pressed and sintered as well. Depends on
the material and - most importantly - quantities.
Hardened carbide dies aren't cheap whereas wire cutting the forming sections
and grinding the gang tooling is.
--
John R. Carroll
www.machiningsolution.com
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Posted by RogerN on June 1, 2008, 5:33 am
Please log in for more thread options I have a heat sink similar to that somewhere. To me it looked like
something done similar to a metal shaper not going through, leaving the chip
attached to base metal. I'm not sure how the process works but I've seen
video of aluminum cans being made by a small piece of aluminum being pressed
in a die and flowing around a punch. Perhaps the fins heat enough to be
formed while being cut?
> What would this process be called?
> Aluminium heatsink used for mounting electronic components to , to conduct
> away heat to the air . Some sort of chisell cutting advance and repeat
> while
> still hot after casting/extruding?, surely not done cold?
>
> http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink.jpg
> a steel rule laid across it,
> plus a close up showing the slightly angled cuts
> http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink2.jpg
>
> The remaining uncut spine is about 4mm wide and the original bulk of metal
> must have been about 9mm wide to be cut down, each side, to a 4mm spine.
>
> --
> General electronic repairs, most things repaired, other than TVs and PCs
> http://www.divdev.fsnet.co.uk/repairs.htm
>
> Diverse Devices, Southampton, England
>
>
>
>
>
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> Aluminium heatsink used for mounting electronic components to , to
> conduct away heat to the air . Some sort of chisell cutting advance
> and repeat while still hot after casting/extruding?, surely not done
> cold?
>
> http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink.jpg
> a steel rule laid across it,
> plus a close up showing the slightly angled cuts
> http://home.graffiti.net/diverse:graffiti.net/chisel_vane_heatsink2.jpg
>
> The remaining uncut spine is about 4mm wide and the original bulk of
> metal must have been about 9mm wide to be cut down, each side, to a
> 4mm spine.