Hello,
We are trying to optimize a cell for cycle time and we have tried changing the process a few times and we are just a few seconds over
The only solution left is making the welding sports from FINE to CNT.
What is the risk of this?
We are using 2 ARO welding guns mounted on robots and one ARO floor mounted gun all with PROMIA standard
Welding spot with CNT valute
- calintomescu
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You can't have CNT motion and weld. Robot does not stop at the position with CNT
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You can use CNT and Spot instruction together, the cnt value change path to “start distance “and “end distance” but not change spot position.
Remember check modifications without step mode slowlyEnviado desde mi iPhone utilizando Tapatalk
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Hello!
Actually I had an experience with ABB and Kuka with spot welding. Really important thing, and You can save a lot of time, if Your welding gun open/close values are well adjusted. I mean that if the maximum open value 180mm, do not drive use it all the time this value
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You absolutely can. Depending on the generation of the robot and the software, they react a little differently. The newer 30iBs handle the motion of it much better and your weld spots will be accurate even with a CNT100. When using a spot command the CNT simply controls the gun open/close speed as it approaches the point.
Current General Motors robot standard calls for all weld spots to be 800mm/sec cnt100. That standard is running on over 3000 robots without issues.
Be a little more careful on ped applications on older robots, as they tend to close the gun a little quickly on spot commands when its set to a cnt100. I've had some issues on some RJ3 stuff before where the gun made contact with the metal a little early and my spot moved a mm or 2. Easily fixed by lowering the CNT value. I've found that anywhere from 30-80 seems to do pretty well on the older stuff and saves quite a bit of time.
As d.kerekes said, getting your gun open/close distances dialed in can help huge. If you're welding welds in a straight line with no interference to clear, open and close distances of 10mm is sufficient and much quicker then larger distances.
Just be aware that if you make your distances too low, you will get a message during welding that calibrated speed could not be reached for that pressure. This relates back to your pressure table and what speeds you set it up at.
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As long as your spot weld guns are servo-driven (not air or air-over-oil driven), go ahead and use the maximum CNT 100 for every spot weld where you can get away with it. With a properly-mastered servo weld gun, the G2 (servomotion group 2) motion will take care of the necessary "FINEness" of the spot location accuracy.
Indeed, if you do not use some relatively large CNT value, then the SD an ED distance schedules will be unable to do their jobs.
If your spot weld application is pedestal-mounted/floor-mounted (instead of carried by the robot faceplate), then utilizing the motion option RTCP my help to standardize observed motion.
Example for pedestal-mounted servo weld gun:
24: L P[9] 800 mm/sec CNT100 RTCP
: SPOT [SD=a, P=b, t=3.2, S=c, ED=d]Example for carried (faceplate-mounted) servo weld gun:
24: L P[9] 800 mm/sec CNT100
: SPOT [SD=a, P=b, t=3.2, S=c, ED=d]where a, b, c, and d are schedule numbers for Start Distance, Pressure (bite force), weld timer heat Schedule, and End Distance
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