Metal working – Method of mechanical manufacture – Obtaining plural product pieces from unitary workpiece
Patent
1992-08-13
1994-03-22
Echols, P. W.
Metal working
Method of mechanical manufacture
Obtaining plural product pieces from unitary workpiece
29412, 29458, 156109, 15624418, 15624423, B23P 1700
Patent
active
052952924
ABSTRACT:
A method of making a spacer frame assembly including the steps of providing a supply of thin, flexible relatively narrow sheet metal ribbon stock, feeding the ribbon stock endwise to a first forming station, stamping the ribbon stock to form spacer frame corner structures at the first forming station by defining zones of weakness at frame corner locations spaced along the stock, stopping the movement of stock through the first forming station while stamping, feeding the stock to a second forming station, and roll forming the stock at the second forming station to define a rigid linearly extending frame element having opposite side walls and a base wall, the corner structures disposed at least in part in the opposite channel side walls. The method further includes the steps of severing the frame element to define leading and trailing spacer frame element ends, accumulating stock between the first and second forming stations comprising forming a variable length stock travel path segment, maintaining a substantially continuous movement of the stock through the second forming station, and increasing length of the stock travel path segment when the stock speed through the first forming station is greater than the feeding speed through the second forming station and reducing the length of the stock travel path segment when the feeding speed through the second forming station is greater than the feeding speed through the first station.
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Bryant David P.
Echols P. W.
Glass Equipment Development, Inc.
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