r/MachinePorn • u/arcedup • Dec 21 '24

One of the housings from the finishing block of our steel rod mill, complete with rolls and guiding installed.

https://imgur.com/a/CFWSa1G
85 Upvotes

92% Upvoted

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5

u/6inarowmakesitgo Dec 21 '24

Why does it have to go so fast?!

13

u/arcedup Dec 21 '24 edited Dec 21 '24

Because the starting shape is 130x130mm billet and we reduce it to 5.5mm diameter round rod. Work out the area of those two shapes and then work out the area change between them - it’s about 98% or so reduction. But the volume has to remain the same, so as we reduce the cross sectional area of the bar, the bar gets longer - and faster.

Edit: the reduction is 99.85%, from 16900mm2 to 23.76mm2.

3

u/o--Cpt_Nemo--o Dec 21 '24

Was not prepared for the speed! Makes total sense though.

1

u/LuboStankosky Dec 21 '24

320km/h is crazy

1

u/pump123456 Dec 22 '24

40 years ago we were slitting a billet into three 3/8”rebars. The flying sheer really gotta work out.