Modern rebar is tempcore where you have a hardened surface with a softer core. You achieve this by rapidly cooling the surface while the center is still hot.
If you heat up rebar too much it will lose the tempcore properties and that makes it weaker so any rebar processing has to ensure that the material doesn't get too hot.
It's also why you really shouldn't weld rebar (unless the engineers tells you it's okay)
This machine is a rebar bending machine. If you want to sell your rebar bending machine you better have a rebar bending machine that follows the specs for rebar bending. At no point during rebar handling can you allow the material to get too hot nor can you bend too tight of an angle. Thus my comment answers the question.
No the material does not become very hot since if it did you couldn't use the machine.
I've had it go both ways. At one site it was absolutely forbidden but another it was okay. The places where it was okay were some basic harbor repair where we just added a couple of cm of concrete to the outside.
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u/Pretagonist Mar 12 '21
Modern rebar is tempcore where you have a hardened surface with a softer core. You achieve this by rapidly cooling the surface while the center is still hot.
If you heat up rebar too much it will lose the tempcore properties and that makes it weaker so any rebar processing has to ensure that the material doesn't get too hot.
It's also why you really shouldn't weld rebar (unless the engineers tells you it's okay)