Page 15 - MetalForming January 2010

machine. Without adjusting the crown- ing system, a different bend angle will result on one end of the part than on the other.
To avoid this inconsistent bend angle along the part, a dynamic crowning system will independently measure the pressure on each side of the press brake, calculate the bending location and adjust the multiple crowning cylinders accordingly, all on the fly and invisible to the operator.
Hear Ye, Hear Ye— Crowning Helps with Short Parts and Long
“Crowning is only required on long parts,” some might say. This, however, simply is not true. If you apply 50 tons of force over a 10-ft. bend length, much less deflection of the upper beam and bed results than if you were to apply 50 tons over a 1-ft. area located in the center of the machine. Therefore, since more deflection of the upper and lower beam results when applying pressure only to the center of the press brake, you need much more crowning to achieve the same relative bottom-dead-center position.
While it is true that a simple angle correction can be made to achieve the target angle in the middle of the machine, why should you have to cor- rect for errors in your crowning system? Shouldn’t the machine be able to com- pensate for its own deflections? Unfor- tunately, most do not. The crowning calculation for most machines is based strictly on tonnage—program 50 tons, you get 50 tons worth of crowning. Not so with dynamic crowning sys- tems, as fabricators using them can attest to a reduction or elimination of setup pieces; avoiding the need to check parts within a batch run; and less oper- ator training.
In fact, the entire crowning system is completely invisible to the operator. With a dynamic crowning system, fab- ricators can expect to reduce labor time and required skill level, slash inventory costs, reduce lead time, minimize scrap, increase productivity and improve quality. MF
With Hundreds to Choose From... Only One SEYI
Solution is Right for You!
A wide range of models, tonnages,
bed sizes...you bet!
Just as important is how we listen to your needs, then build a solu- tion that works best for you.
Often, we'll build a custom system engineered from our standard product line (outfitting it with needed automation, tooling, or coil handling).
Gap Frames Presses to 330 tons. Single- and double-point designs available.
Straightside Presses to 2,400 tons. Single-, two-, or four-point designs; crank or eccentric gear driven presses available.
Link Motion Presses to 2,400 tons. Single- and double-point designs. Link motion reduces the working stroke’s velocity up to 40% for better overall productivity and part quality.
Servo Drive Presses. Contact us for more information on our new line of SD1 Series.
“SayYes” to a SEYI press. Contact us today.
SEYI PRESSES, INC.
California Office
203 Lemon Creek Dr, #A Walnut, CA 91789
TEL: 909-839-1151
FAX: 909-839-1150
Tennessee Office
843 Joint Park Blvd Tullahoma,TN 37388 TEL: 931-455-7700 FAX: 931-455-6092
www.metalformingmagazine.com
METALFORMING / JANUARY 2010 13
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