B - Operations – Transporting – 26 – F
Patent
B - Operations, Transporting
26
F
164/140
B26F 1/14 (2006.01) B21D 28/34 (2006.01) B23K 1/00 (2006.01) B26F 1/32 (2006.01)
Patent
CA 1048923
ABSTRACT OF THE DISCLOSURE A punch is formed by heat hardening a tool steel body previously machined to define a punch body portion having an end opening cavity including a conical end opening portion and a cylindrical bare portion; inserting a cylindrically shaped hard and abrasive resistant punch element into the cavity through the conical end portion for press-fit assembly within the cylindrical base portion conductively heating the punch body immediately adjacent the conical end portion up to the melting temperature of bonding material and overfilling a space defined by the conical end portion and the punch element with such bonding material while preventing migration of hard- ness altering heat axially within the punch body away from the area of the cavity; air cooling the punch body to solidify the bonding material and thereby bond the punch element to the punch body; and grinding away overflow portions of the bonding material to provide a "radius" of bonding material blended into the punch element and body portion.
254408
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