.370 (9.4mm) Mild Steel

[jobei]

Hey guys. This is my first time posting here. I think you guys should be able to help me out.

I have an Amada 3015 FO laser, 4k watts. I'm trying to cut this thick HRPO. I started using oxygen assist gas and was having trouble getting the laser to pierce at all. I switched to nitrogen and had better luck, but getting nothing but dross. I also tend to lose my cut when get to 90 deg corners.

i tried both 1.4 and 4.0 double nozzles using the oxygen, and i used 4.0 double using the nitrogren.

I'm attaching pictures of my oxygen settings.

thanks in advance for any help you can give me.

 

[jobei]

PHOTO #2

 

[jobei]

PHOTO #3

 

[burex2]

hi, what are your cut parameter? i cut with an old amada 3kw beta3 10mm with oxigen.
speed ( slow but safe speed) 1200mm/min
power= 3kw
frq=1500hz
duty=68
pres=0.6 bar
nozzle gap 1.5 mm
focal point 2 to 4 mm above the surface (now i dont remenber)
i use the 1.4 double nozzle
lens 7.5"

pierce (i will say to you my setting tomorrow, now dont remember well)
3kw
in frq 10 in duty10
incrfrq 4 duty 1
step
t=0.3 c=15
time 8
p=0.8 bar
gas time 0.8
h nozzzle 3.5
send a photo of the cut.

 

[jobei]

Hey Burex,

Looks like i need some minor tweaks to my conditions, particularly my pierce to match yours. If you can send me a picture of yours that'd be great.

You say the focal point should be 2-4 mm above the surface. I dont know how to figure that out. All i know is that my focus runs from about -.187 to .250 or something like that. I dont know how to tell what is above the surface and what's below the surface.

I will attach pictures of the cut and my cutting conditions.

 

[jobei]

CUT PHOTO #1

 

[jobei]

CUT PHOTO #2.

I am not having an issue with the outside edge, except for the large notch where it pierces. My piece was about half an inch away from the edge of the part.

My issue is when it pierces, it blows molten metal all over the top of the sheet. It looks like a nice ramped pierce, nibbling at the metal, until it goes to cut, and then it blows out. I've heard others say that i should pre-pierce all my holes and then come back and cut them.

 

[burex2]

E1 very small holes
E2 for hole < 10mm of diameter
E4 > 10mm diameter
E6 outside cut
E10 marking

i use pirc. condition 101
my zero focal position (minimun diameter of laser beam on the surface of a thin sheet) for both lens is approximately 12.5 of the B axis.
in my machine settings, the focal zero of the 7.5 "lens (" focal [mm] "in the cutting conditions) is the number 8.1mm.
in my control the number that controls the focal of the material is the E1 line under Focal [mm ]
which in this case is 6.6mm, so my focal length in this material is 8.1 + 6.6 = 14.7 (position B axis) >>>> 14.7-12.5 = 2.2 mm (focal point is located above the 2.2mm sheet surface ... approximately)
your pierces explodes because there is too much heat, check that you are going to break through with the same pirce line (type 101) and to use the command M103.

 

[burex2]

in my machine settings, the focal zero of the 7.5 "lens (" focal [mm] "in the cutting conditions) is the number 8.1mm.

with this phrase -in my machine settings ...- I mean, that in another screen (which I have not posted the photo now) there are the basic settings / parameters of the 2 lenses.

 

[jobei]

I appreciate the pictures.

is 25.00 mm your material thickness for these conditions?

 

[burex2]

no no the material is 10mm, that is due to the fact that we have the sheet metal warehouse and the various pallets have different heights of the gratings (fakir beds), this is because we have to reduce the contamination of the stainless steel from the splashes of molten material coming from the cut.

 

[jobei]

got it. I will try these conditions out later on today and i'll let you know how it goes. Your help is much appreciated.