Metal working – Method of mechanical manufacture – Obtaining plural product pieces from unitary workpiece
Patent
1999-04-19
2000-10-03
Bryant, David P.
Metal working
Method of mechanical manufacture
Obtaining plural product pieces from unitary workpiece
29412, 29414, 294264, 83917, B23P 1700
Patent
active
061255203
ABSTRACT:
In a process and apparatus for forming parts from a sheet of metal stock material so that they can be separated by a shake-and-break operation, elongated holes are punched in the sheet to separate the first part from the second part except at at least one shake-and-break location. At the shake-and-break location, a frusto-conical shape punch and die punch an opening on either side of a center tab connecting the parts. The wider ends of the frusto-conical shape holes face the tab, and the narrower ends adjoin the elongated holes and have the same width as such holes. In such a manner, the points where ends of the tab connect to the first and second parts are located in recesses located to the outside of the edges of the elongated holes. When the pieces are subsequently separated in a shake and break process, any residual burrs from where the tabs separate from the parts are located in the recesses, rather than along the edges of the part, and do not need to be removed.
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Bryant David P.
Omgba Essama
Thyssen Elevator Holding Corporation
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