Parameter Changing
Parameter Changing
(OP)
Hello all,
I have been running a Bystronic Bystar 3015 for a couple of years now and it has been a great machine, however. Since we have had the machine every now and again the cut quality will just go right out the window. I could be cutting a 4 sheet nest, I can have cut 2 sheets then after transfering the third sheet hit start and the parts will be stuck together like the focal length is wrong or it will plasma the top of the sheet. To rectify this problem I have had to do some major changes of parameters to get back to a quality cut. This could entail changing laser power, gas cutting pressure, focal and feed rate, or sometimes all 4. Then after a day or to it will just go south again still using the same params that were working fine. I would change the params back to what they were originally and it's back to normall for a month or 2. This could also just happen halfway through cutting a sheet as well not neccesarily after starting a new sheet. It has everyone here scratching there head when it happens. Service Tech puts it down to beam alignment but I can't see that being the problem as it can change back to old params.
To give you an idea of the changes I sometimes have to make
Normal params for 3mm SS After issue depending on how bad it is
LASER POWER 3600 Between 3000 - 4200
FEED RATE 4400 Between 3900 - 4800
GAS PRESSURE 12 Always up never down 15bar
FOCAL LENGTH 3.8 Between 2.9 - 6
It's so random
Anyone experienced anything like this before ???.
It's not a major issue if I catch it early and I have enough knowledge to fix this issue when it arises quite fast, but if I can stop it from happening in the first place that is more ideal.
Specs
Bystronic Bystar 3015
Year of Manufactor 2005
The machine orginally came from Germany and now is in Perth Western Australia. I'm wondering if that has something to do with it. I remember one Tech who came to service it said it was missing something or had something on it that was unusual until I told him it came from Germany. That will be why he said because of the extreme cold during there winter.
Cheers in advance for any advice.
Chris
I have been running a Bystronic Bystar 3015 for a couple of years now and it has been a great machine, however. Since we have had the machine every now and again the cut quality will just go right out the window. I could be cutting a 4 sheet nest, I can have cut 2 sheets then after transfering the third sheet hit start and the parts will be stuck together like the focal length is wrong or it will plasma the top of the sheet. To rectify this problem I have had to do some major changes of parameters to get back to a quality cut. This could entail changing laser power, gas cutting pressure, focal and feed rate, or sometimes all 4. Then after a day or to it will just go south again still using the same params that were working fine. I would change the params back to what they were originally and it's back to normall for a month or 2. This could also just happen halfway through cutting a sheet as well not neccesarily after starting a new sheet. It has everyone here scratching there head when it happens. Service Tech puts it down to beam alignment but I can't see that being the problem as it can change back to old params.
To give you an idea of the changes I sometimes have to make
Normal params for 3mm SS After issue depending on how bad it is
LASER POWER 3600 Between 3000 - 4200
FEED RATE 4400 Between 3900 - 4800
GAS PRESSURE 12 Always up never down 15bar
FOCAL LENGTH 3.8 Between 2.9 - 6
It's so random
Anyone experienced anything like this before ???.
It's not a major issue if I catch it early and I have enough knowledge to fix this issue when it arises quite fast, but if I can stop it from happening in the first place that is more ideal.
Specs
Bystronic Bystar 3015
Year of Manufactor 2005
The machine orginally came from Germany and now is in Perth Western Australia. I'm wondering if that has something to do with it. I remember one Tech who came to service it said it was missing something or had something on it that was unusual until I told him it came from Germany. That will be why he said because of the extreme cold during there winter.
Cheers in advance for any advice.
Chris





RE: Parameter Changing
RE: Parameter Changing
Cheers drossfree
RE: Parameter Changing
As i said dont know the machine but. i have seen similar things and then it has been faulty wire to head or the connector on the head which could be faulty.
RE: Parameter Changing
RE: Parameter Changing
do you cut with or without folie,thats very important ...do you cut 304 or 316
for 3mm ss with pvc folie ;
nozzle height 0.7 mm
lens 5"
focus -2.5 to -3.0 or on bystronic 2.5 to 3.0
speed never over 4000 mm/min
power on ss always on 99% of the machine
nitrogen pressure from 10 to 13 bars....not more(you get counter effect)
without pvc little less pressure and more speed,lower focus
with 7,5" lens i dont recommend if you need top quality
greetings
Ivan!
RE: Parameter Changing
1. Check if there is a rubber spacers next to your head. See photo below.
2. Check if your laser head clamps, clamp head firmly. We have changed those.
3. Ceramics in laser head can be broken or with cracks. I suggest to change it to new.
4. Check if O2/N2 filters are clean.(Next to intake gauges)
5. Couple of mirrors in resonator or along the path could be weared off, dues to age or bad cooling.
RE: Parameter Changing
Chris Krug http://krugtech.com/
Maximum Up-time, Minimum BS
RE: Parameter Changing
Not sure how bystronics work, but I imagine very similar.
"I am stuck on Band-Aid brand, 'cause they are stuck on me"
RE: Parameter Changing
@ Maito
1. Check if there is a rubber spacers next to your head. See photo below. Yes
2. Check if your laser head clamps, clamp head firmly. We have changed those. Yes but havent changed them since we've had the machine. But head is tight and secure
3. Ceramics in laser head can be broken or with cracks. I suggest to change it to new. I'm vigilent with checking the ceramics when issues arise
4. Check if O2/N2 filters are clean.(Next to intake gauges) Service was done in Jan this year and all filters replaced
5. Couple of mirrors in resonator or along the path could be weared off, dues to age or bad cooling. All mirrors have been replaced within the last year including the $10.000 Bypos mirror
I have long suspected the head clamps may be an issue so thats my next change out. It only takes a fraction of movement at the head to throw the beam alignment out. Did you guys buy in new Bystronic parts or did you cut them in house ???. It's the intermitant nature of the problem that has me scratching my head.
@Krugtech
All the filters are newish and replaced reguarly. The adjusting of params can range from just changing the focal length of the beam to having to change feed rate, focal, laser power and gas pressure in one go. The power is stable, I can watch it in realtime through the diagnostics tab while laser is cutting. No change in power when issue is there. What it always seems like is the beam alignment is out but when checking it, it is perfectly centered.
@ RPosty
Most of the working components have already been changed out. The output coupler and the Thermoplie both were changed only 3 months ago. The Thermopile was actually not working at all and we all thought yay that's been the issue all along as thats what sets and maintains the power output. But saddly no the problem still remains. The only working components yet to be changed are 3 of the 4 Exitation modules. We had one die which according to Bystronic is very rare. They say there good for 80,000 hours before problems may happen. Ours are only at 38,000 hours.
Thanks heaps for your input. The knowledge base on this site is invaluable.
If I finally nut this problem out and find the cause I will certainly be sharing it on here.
RE: Parameter Changing
Regarding head holders I have cut it myself with our laser
RE: Parameter Changing
Chris Krug http://krugtech.com/
Maximum Up-time, Minimum BS
RE: Parameter Changing
change in the first place. I have in the past just left it cutting badly as we have a 1500mm wide Linisher to knock the molten steel off and its gone back to cutting perfectly all on it's own without changing anything. Mostly cut Mild steel 316, 304 Stainless. I may go months without it happening, it could happen twice a day.
I am locacted in Perth Western Australia. Dry hot climate most of the time. The Machine origanally came from Germany which has a similar summer but much colder winter.
RE: Parameter Changing
The first pic is the underside of 3mm Carbon steel as you can see it's a clean cut. No dross, no small beads. The type of cut quality we all want. The other pic is the other end of the same sheet with the same settings and look at it. In need of a hammer to get those parts apart then a clean up. Now the funny thing about this time is it is only happening at about 3/4 of the sheet. It has done this on the last 3 sheets cut but not the 4th. ( Insert, Bangs head against wall smiley here ). To look at that I would say it needs a nozzle alignment but the sheet before that point and after that point are as good as the fisrt pic.
It's got a new lence, new ceramics and the nozzle is centered. Can't see how it changes so dramaticly and only in that spot.
I tried adjusting the focal length as the cuts get to that part of the sheet and it cuts perfectly again but then returns to crap as the focal is out when it moves further over to the last quarter. So a quick change back and it's fine. So it looks like the focal length is changing with the moving of the bridge. But as I said above it's not doing it now. Might need to get our tech guy back out. Problem is it never does this when he's here. And we all know how hard it is to find an intermitent fault.
Thanks for the advice and help on this. I will keep it updated if I finally knock this Gremlin on the head.
RE: Parameter Changing
Just thinking out loud. Is it possible that linear guides are wearied off at certain place? Maybe there is some other equipment or machinery running nearby which cause vibration? When you did beam alignment was it checked in all 4 corners? and beam circle is the same everywhere?
RE: Parameter Changing
No idea on the linear guides on the bridge though. The head guides where done recently as the bearings started to fall out. We will contact our Tech and see whats involved. Boss always likes to save money if we can do it ourselves.
I don't think vibration is an issue but I have long thought about an excessive power draw in the area from another business in the area at certain times. Hence the fact it happens intermitantly. Perhaps putting a strain on the power.
RE: Parameter Changing
i would say mirrors should be checked, if they are not fasten properly. (or bad mirror)
RE: Parameter Changing
I know this isn't much help in solving your problem. But maybe we are experiencing similar issues and it seems everyone knows the FO3015 on here. Any further input would be greatly appreciated.
RE: Parameter Changing
Also do a nozzle tape shot when you know the cut is good.
When it starts cutting bad check the chiller temp again (is it the same temp)
When it starts cutting bad quickly check the check the nozzle shot again with tape (compare the good & bad nozzle shot, diameter & position in the nozzle)
Do you always cut from one end of the bed & work to the other end? try starting from the opposite end of the sheet (where is the poor cutting now, which end of the sheet)
have you done both cold & hot mode burns, if not you should, might be blocked water way feeding the OC.
Im guessing OC temp related, you mention you changed the focus part way through the sheet & then it comes good again, there might be a chance that in the time it takes you to change the focus the OC has cooled down again & the mode is back to normal?
You should get you hands on a laser thermometer & check all optic temps when it cutting good then check then all again when cutting bad & compare.
how much are you changing the focus by to get it cutting again?
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RE: Parameter Changing
what "GAS REGULATOR" are you talking about?
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RE: Parameter Changing
RE: Parameter Changing
Anyway Problem solved. Seems my ARC mirror decided to increase the beam diameter to twice it's factory recomended size, 40mm instead of 20mm.
So now it's smooth cutting from here on in.
Thanks again guys
If you ask me to do something, I will do it. There's no need to nag me every 6 months
RE: Parameter Changing
RE: Parameter Changing
I can now cut using Bystronic default settings with only minor tweaks rather than major changes.
If you ask me to do something, I will do it. There's no need to nag me every 6 months
RE: Parameter Changing
RE: Parameter Changing