Hello,
I would like to ask you about the topic " Servo motor robotic welding guns and Servo pneumatic robotic welding guns ". Do you know someone what are the advantages and disadvantages? Thank you.
Roboterschweißzangen/robotic welding guns
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safix -
December 16, 2016 at 10:44 AM -
Thread is marked as Resolved.
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Servo guns are generally more accurate in applying force, as most of them include some degree of closed-loop force sensing and control. They can also more intelligently compensate for tip wear over time, and measure tip wear as well. This can make your tip-cleaning and/or replacement based on actual conditions of the hardware, rather than on a fixed time/iteration schedule.
Servo guns, at least the better ones, can also be part of the robot's motion model, making it possible to squeeze them into tighter spots than pneumatic guns are capable of. You can also pull tricks like performing a large portion of the gun closure on the fly between points, squeezing more cycle time out of each weld spot.
Servo guns are also closed-loop in their positioning. A pneumatic gun, if it begins to suffer some friction in the actuator, usually will simply fail to make a good weld b/c the gun doesn't close completely to force within the expected time. A servo gun, thanks to the closed-loop position and force, can avoid these failures. One can also track the servo data and use it to diagnose, or even predict, maintenance requirements and/or failures.
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Thank you,
do you know which ones are better in terms of energy consumption?
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That... would be a very complex question to answer, and depend on many starting assumptions. In general, I think that the electrical servo has the edge, but it's really going to depend on the specific units being compared. A pneumatic gun is going to require a steady pneumatic pressure supply, and a large plant with hundreds of them will require very large compressors running nearly constantly to keep the mains at pressure. And every small pneumatic leak throughout the facility will increase the energy consumption of the compressors. On the other hand, most large compressors are very efficient.
An electrical servo would consume more power in motion than a pneumatic servo, but would consume no power while stationary (whereas the pneumatic servo is always "consuming" power constantly from the need to maintain the facility mains pressure). And electrical servos continue to improve in efficiency.
A cheap electrical servo might lose when compared to a pneumatic servo with a high-efficiency compressor feeding a pneumatic distribution network with minimal leakage. But a pneumatic system supplied by a cheap compressor and a leaky network will probably lose to a high-end electrical servo. In between... well, there's a lot of grey area.