US PATENT SUBCLASS 72 / 352
.~ Forcing work into or within closed die; e.g., forging

Current as of: June, 1999
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72 /   HD   METAL DEFORMING

343  DF  BY USE OF CLOSED-DIE AND COACTING WORK-FORCER (E.G., PUSH-DRAWING) {3}
352.~ Forcing work into or within closed die; e.g., forging {6}
353.2  DF  .~.~> By two or more coacting tools movable relative to closed die; e.g., tool complex {3}
356  DF  .~.~> With additional metal-deforming
357  DF  .~.~> With actuation of split die
358  DF  .~.~> Tool portion enters cavity of closed die {1}
360  DF  .~.~> Coacting closed-dies
361  DF  .~.~> With holding, handling or guiding of work or product

DEFINITION

Classification: 72/352

Forcing work into closed die; e.g., forging:

(under subclass 343) Subject matter wherein the operation is disclosed as having been completed while the deformed work material remains in the interior of the closed die.

(1) Note. Apparatus of this and the indented subclasses typically embodies a closed bottom die, rather than the through die which characterizes extrusion or wire-drawing devices in preceding subclasses 253.1+ and 274+. Deep drawing is sometimes effected in closed bottom dies of suitable configuration (i.e., with cylindrical wall section, see subclass 347).

(2) Note. The product of this and the intended subclasses is usually formed in three dimensions as a discrete object, e.g., a drop-forged article, or as a localized deformation of stock material or of a larger object (e.g., a bolt head upset at the end of a rod) as distinguished from the continuous or indefinite length products of many through die operations.

(3) Note. A complete search for closed bottom closed die apparatus or method will involve many of the preceding subclass areas in this schedule, particularly, deforming by fluid pressure (subclasses 54+), and by use of relatively movable clamp (subclasses 293+).

SEE OR SEARCH THIS CLASS, SUBCLASS:

61+, for metal deformation by use of fluid pressure and fixed die for expanding hollow work.

293+, for metal deformation by work clamp and relatively movable tool (which may constitute a closed die).

462+, for a metal-deforming tool, per se. SEE OR SEARCH CLASS

267, Spring Devices,

119, for a piston-type fluid spring device useful as a press cushion in a sheet metal deforming, die cavity press; and subclass 130 for a spring device, other than fluid spring

type for such use.