Method and apparatus for quenching a tubular workpiece

Details Method and apparatus for quenching a tubular workpiece Method and apparatus for quenching a tubular workpiece

1995-07-19

1997-05-06

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148519, 148647, 266117, C21D 908, C21D 1667

Patent

active

056266936

ABSTRACT:
This invention provides a method and apparatus for quenching a tubular workpiece such as cylindrical tubes or different-shaped tubes, which are difficult to be exerted constraining force for preventing warping especially in case of thinner thickness. Warping is prevented by applying a constraining force which is increased from beginning of the quenching to termination thereof, corresponding to increase of elasticity limit stress in accordance with temperature drop of the workpiece. Furthermore, apparatus for carrying out the method for quenching a tubular workpiece are offered, wherein the apparatus are provided with a pressure controller for pressure rolls or dies, thereby the pressure controller changes setting input for the pressure during the quenching.

REFERENCES:
patent: 4050963 (1977-09-01), Kunioka et al.
patent: 4461462 (1984-07-01), Mizushima et al.
patent: 5492308 (1996-02-01), Yao et al.

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