Lack of Closed-Loop Control part 2: This is the o
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Posted On: 01/06/2014 1:20:10 PM
Lack of Closed-Loop Control part 2:
This is the other closed-loop system that I mentioned earlier. It is optical based and checks geometry. The machine is correct after the error in geometry has occurred.
http://patft.uspto.gov/netacgi/nph-Parser?Sec.../6,122,564
"The laser is used to locally heat a spot on a substrate, forming a melt pool into which material, preferably in powder form, is fed so as to create a deposit having a physical dimension. Optical detection means coupled to an optoelectric sensor are used to monitor a physical dimension of the deposit, and a feedback controller is operative to adjust the laser in accordance with the electrical signal, thereby controlling the rate of material deposition."
The above only describes the laser melting process by the use of the term "melt pool". The patent doesn't monitor weld pool for uniformity as required by GE Aviation engineers:
http://www.industrial-lasers.com/articles/pri...ation.html
http://patft.uspto.gov/netacgi/nph-Parser?Sec.../6,925,346
"Multiple criteria are monitored and controlled to enhance the success of direct-metal deposition, including greater control over factors such as deposit layer height/thickness, sub-harmonic vibration, contour path shape, powder mass flow, and deposition speed, and stress accumulation. Sensors are used to monitor some or all of the following parameters during the deposition process: deposit height, width, temperature, and residual stress ."
Again, Jyoti Mazumder is only claiming a closed-loop for geometry.
What Sigma Labs has developed is substantial. The technology is what Prabhjot Singh and GE Aviation engineers discusses in the requirement for reliability and robustness.
This is the other closed-loop system that I mentioned earlier. It is optical based and checks geometry. The machine is correct after the error in geometry has occurred.
http://patft.uspto.gov/netacgi/nph-Parser?Sec.../6,122,564
"The laser is used to locally heat a spot on a substrate, forming a melt pool into which material, preferably in powder form, is fed so as to create a deposit having a physical dimension. Optical detection means coupled to an optoelectric sensor are used to monitor a physical dimension of the deposit, and a feedback controller is operative to adjust the laser in accordance with the electrical signal, thereby controlling the rate of material deposition."
The above only describes the laser melting process by the use of the term "melt pool". The patent doesn't monitor weld pool for uniformity as required by GE Aviation engineers:
http://www.industrial-lasers.com/articles/pri...ation.html
http://patft.uspto.gov/netacgi/nph-Parser?Sec.../6,925,346
"Multiple criteria are monitored and controlled to enhance the success of direct-metal deposition, including greater control over factors such as deposit layer height/thickness, sub-harmonic vibration, contour path shape, powder mass flow, and deposition speed, and stress accumulation. Sensors are used to monitor some or all of the following parameters during the deposition process: deposit height, width, temperature, and residual stress ."
Again, Jyoti Mazumder is only claiming a closed-loop for geometry.
What Sigma Labs has developed is substantial. The technology is what Prabhjot Singh and GE Aviation engineers discusses in the requirement for reliability and robustness.
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