Page 93 - MetalForming October 2019
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The Science of Forming
Process: Destacking and Transfer Between Stations
Hand-loading blanks during tryout may be easier in some cases than the automatic destacking from a lift of blanks and the subsequent transfer between stations in production. When running in automatic mode, lubricant tackiness may increase the risk of lifting multiple blanks simultaneously. Remember that not every sheet metal is magnetic.
Resting softer metals on conveyor belts increases the risk of underside damage and print-through, due to for- eign materials on the belts coming in contact with the blank or formed part. Transfer bars or fingers may be required for transfer between stations. Ensure that all trim scrap can fall free of each die at production rates with no risk of interference or scrap backup.
Press Equipment
Because the industry overall has suf- ficient knowledge of the differences between hydraulic and mechanical presses, those differences will not be covered here.
Be aware of differences in derated tonnage (tonnage available at a specific distance off bottom) between the try- out and production presses, and con- sider press-energy characteristics when working with high-strength material.
Stamping higher-strength sheet metal increases reverse tonnage (snapthrough) severity. Tryout presses may have greater capacity to accom- modate a wide variety of projects. The production press and process must have features to minimize the impact of greater snapthrough tonnage. Over time, unless steps such as placing shear on punch faces and staggering engage- ment heights are taken, press align- ment and durability can be affected
If you have questions or would like to see specific topics covered in future columns? Let me know at ScienceOf- Forming@EQSgroup.com. MF
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