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TT Graph is a signature analysis program that generates tonnage
signatures and provides a simple approach for analyzing the signatures. Tonnage signatures
provide a graphical picture of what is happening during the press stroke. The signatures
can be resolver or time based, depending on the type of monitor being used. |
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| TT Graph tonnage signatures help identify press and die problems such as: |
- Off center loading
- Loose tie rods
- Gib chatter
- Loss of binder tonnage
- Die timing
- Worn weld beads
- Dull punches
- Bearing problems
- Nitrogen cushion wear
- Lubrication variances
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Signatures:
Signatures can be stored, recalled and overlaid with new
signatures for comparison. Variances in the signature indicate potential mechanical press
problems, die problems and subsequently off tolerance parts. When an alarm occurs, signatures |
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are automatically saved when also using PressNet. This eliminates the worry of someone having
to save it. Once it is saved, someone can look at it to pinpoint the problem and refer to it
in the future if the same problem occurs. |
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Enveloping:
Enveloping puts high and low tonnage limits around the actual tonnage
signature throughout the entire press stroke. TT Graph can graphically show this for the N260 Series
Production Monitors and SLIM. If the tonnage increases or decreases and either of the high or low
limits are violated, an alarm occurs and the press will stop if you are using enveloping with these
monitors. The limits are typically used more for die protection and part quality assurance than just
press protection. A high enveloping fault may indicate slug buildup, material misfeed, etc. A low
enveloping fault may signify a loss of nitrogen cylinder pressure, die wear, not enough shear on a
punch, etc. |
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