Is Cutting aluminiumized steel sheet metal Okay ? 2

[aws04]

Does anyone have any experence cutting a 0.9mm sheetmetal
called galvaneel? I think it is an alturnative to galvanised sheet and has a aluminiumized-galv coating.
We Are cutting it with a Bystronic Byseed and it was going okay until we had a lens failure 10 sheets into a 200 sheet
job. Was this bad luck or is this stuff the cause of the lens failure?
(lens was near new & in good condition)
We were running in full auto with the operator
at the change table changing sheets so we did not stop the machine quick enough and took out the bypos mirror as well.
we are now going to fit the lens failure detection upgrade
kit if I can find out if it works okay.

thanks
arran

 

[btrueblood]

Mmm..."Galvannealed" steel (per ASTM A653, "A" grades instead of "G" for galvanized grades) is steel that has been wiped after dipping in hot zinc, and/or then subjected to a thermal treatment that makes the zinc form an alloy of Fe/Zn on the surface. Its main benefit is a smoother surface than standard galvanizing (spangled), that makes a nice paint substrate. Basically, the surface is zinc-rich, but somewhat less zinc is there than compared to galvanized sheet. There shouldn't be very much aluminum in the coating.

"Galvalume" is a Ryerson trademark for a zinc/aluminum hot-dip coating for steel, per ASTM A792. There are other aluminizing treatments for steel too (e.g. Al-Si coatings per ASTM A463).

Both/either/all types of coated steel will generate a lot of oxide smoke that can obscure laser optics. But, our local vendor cuts them with ease (they use a fair bit of shield gas for the optics as compared to plain steel, however).

 

[alejandroillini]

my guess is the problem is the reflective ness of the material there are fancy graphite powders and then there is dish soap I haven't actually encountered these stituations but from people that have ran exotic materials told me that If I run shinny materials(even if the material is dull the molten metal may be shiny )coat it with something to would make the material not as refelctive thos are two suggestions

 

[thepooh]

hello

In France some of my customers are cutting GALFAN (Al-Si coating) with nitrogen realy without problem from 0.8 to 2mm but a little slower than electrogalva

the pooh

 

[aws04]

We finaly got back onto this job (after a good clean and replacing bypos mirror & lens) and just cut 100 odd sheets
without out problems at 16 metres per minute on rapid parameters with satisfactory cut quality.
So it must have just been bad luck to lose a lens at only
200 or so hrs.

Thanks everyone for the info.