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Concurrent, adjacent heat treatment and cooling in metal annealing

a heat treatment and metal technology, applied in the field of heat treatment of metals for annealing, can solve the problems essentially of little use in the careful control of temperature required to prevent overheating and and heating resulting from inductive fields generated in aluminum and aluminum alloy workpieces. , the effect of deterioration of mechanical properties

Inactive Publication Date: 2018-01-11
NEWTON GREGORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a system for heat treatment and cooling of metal workpieces in a way that allows for annealing of one section of the workpiece while keeping the adjacent end non-annealed. This process is advantageous for induction heating for annealing of one section of a workpiece while maintaining relatively non-annealed properties in an adjacent end. The invention has been found to have a very narrow transition zone between a fully annealed heated section and an essential non-annealed cooled section. This results in a thermal "dam" forming an interface of the heated section and the cooled section. The invention process provides unique opportunities for achieving desired properties in metal workpieces, while maintaining non-annealed properties in an adjacent end.

Problems solved by technology

Overheating must be avoided, i.e., initial eutectic melting temperatures must not be exceeded, in that early stages of overheating are not apparent but will result in a deterioration of mechanical properties of the workpiece.
While induction heating is well known and a desirable and inexpensive alternative to furnace heating of aluminum and aluminum alloys for annealing as described above, it is essentially of little use in the careful control of temperature required to prevent overheating and deterioration of mechanical properties as described above.
As such, heating resulting from inductive fields generated in the aluminum and aluminum alloy workpiece races upwardly and is basically out of predictive control.
Undesired full melting of aluminum and aluminum alloys is known when using inductive heating for annealing a workpiece.

Method used

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  • Concurrent, adjacent heat treatment and cooling in metal annealing
  • Concurrent, adjacent heat treatment and cooling in metal annealing
  • Concurrent, adjacent heat treatment and cooling in metal annealing

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Embodiment Construction

[0031]The invention is now discussed with reference to the drawing figures and specific examples.

[0032]FIG. 2 is a generalized cross section of a metal workpiece 10, exemplary aluminum, showing heat treated zone 11, a cooling medium 14, a lower cooled zone 15, an upper cooled zone 16, and a transition zone 12, a relatively narrow band in workpiece 10. In transition zone 12, physical properties (such as hardness and related properties) of the workpiece transition far more rapidly than in zone 11 above and zone 13 below transition zone 12. In the invention process, heat transfer to an upper part of or all of zone 11 results in a significant change in the physical properties of at least an upper part of zone 11, resulting in rapid heating of zone 11. Heat transfer from zone 11 would rapidly take place into upper cooling zone 16, but for application of cooling medium 14 to a lower cooling zone 15 of cooling zone 13. Cooling medium 14 may be dry ice, cooled or liquid gases (such as nitro...

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Abstract

The present invention is a system of concurrent, adjacent heat treatment and vigorous cooling in section-annealing of metal workpieces. The invention process is especially advantageous in induction heating for annealing of one section of a workpiece while maintaining relatively non-annealed properties in an adjacent section.

Description

[0001]The present application claims priority from provisional U.S. Patent Application Ser. No. 62 / 360,718 filed Jul. 11, 2016, the content of which is expressly incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention is broadly directed to heat treatment of metals for annealing, and more particularly to a process for restricting annealing to a desired portion along a length of a metal workpiece.BACKGROUND OF THE INVENTION[0003]It is well known that annealing is, in general, a process of treating a metal workpiece by heating, maintaining a certain time at temperature(s), and cooling the workpiece to produce desired properties in the workpiece. Cooling should be done at a pre-determined cooling rate, so that the achieved, desired properties are not adversely affected. Annealing is an ancient process where a work piece is exposed to a temperature-time-atmosphere process steps in order to reach certain desired properties.[0004]Work pieces created with imperfe...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22F1/04C21D1/26C21D1/42
CPCC22F1/04C21D2221/00C21D1/26C21D1/42Y02P10/25
Inventor NEWTON, GREGORY
Owner NEWTON GREGORY
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