Thread rolling machine. Making a leadscrew? Large GIF:
Previously:
Bolt threading GIF
Thread rolling machine. Making a leadscrew? Large GIF:
Previously:
Bolt threading GIF
Last edited by Jon; Sep 11, 2020 at 01:54 PM.
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aphilipmarcou (Sep 29, 2017), Marine2171 (Sep 27, 2017), olderdan (Sep 28, 2017), PJs (Oct 17, 2018), Seedtick (Sep 27, 2017), Toolmaker51 (Oct 17, 2018)
Priemsy (Oct 17, 2018)
Priemsy (Oct 17, 2018)
Thread rolling occurs same as knurling, where pressure impresses pattern of the 'die'.
Compared to single point threading, because material isn't removed, the grain structure follows the thread profile. Very accurate, smooth, strong and at less expense than cutting.
Socket heads are made in different ways; depends on volume produced. Most are upset in a header and knurled, a mandrel punches the hex from an undersize recess. That by the way also preserves metallic grain as thread rolling does.
Larger hex can be rotary broached, often chips remain adhered in the bottom corners.
Sincerely,
Toolmaker51
...we'll learn more by wandering than searching...
I thought the same thing, but when I looked closer at the relative rotations between the screw(bolt) and the dies, it looks like the bolt is unscrewing itself backwards at the same rate that the dies appear to be drawing it forward. (Basically, a different way of saying the same thing as what IAMSatisfied, said.)
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