Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1975-03-26
1977-05-03
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148 39, 148147, 148150, 148152, 148154, C21D 110
Patent
active
040212742
ABSTRACT:
Steel workpieces, such as thread-forming screws and bolts, tapping tools, and the like, are hardened in localized areas to controlled depths of hardening by utilizing loose electromagnetic coupling between the workpiece and the induction coil. The loose coupling reduces the criticality of the positional relationship between the workpiece and coil and also allows unidirectional axial through-feed of headed workpieces. A high degree of symmetry of hardening around each piece and uniformity of hardening from piece to piece at high production speeds is accomplished.
REFERENCES:
patent: 1946876 (1934-02-01), Northrup
patent: 3769103 (1973-10-01), Wardwell et al.
Dean R.
Russell, Birdsall & Ward, Inc.
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