Cutting – Tool or tool with support – Cutting couple type
Patent
1975-08-14
1976-08-17
Yost, Frank T.
Cutting
Tool or tool with support
Cutting couple type
83698, B26F 114
Patent
active
039747280
ABSTRACT:
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 base 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 a bonding material and overfilling a space defined by the conical end portion and the punch element with such bonding material, while preventing migration of hardness 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.
REFERENCES:
patent: 2299534 (1942-10-01), DeLorme
patent: 2622682 (1952-12-01), Kopczynski
patent: 2808108 (1957-10-01), Pellegrino
patent: 3334809 (1967-08-01), Zajic et al.
patent: 3641860 (1972-02-01), Whistler, Sr. et al.
Pivot Punch Corporation
Yost Frank T.
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