Back to results
US 4,622,841 AGranted
Method of forming long metal tubing to tapered shape
OwnerKeiichiro Yoshidainventor
Life of this patent
Estimating the term…
Abstract
A method for finishing a relatively long metal tubing stock to any desired tapered shape through a single-pass operation. The method is performed with any number of individual swaging units, arranged in tandem each having the identical construction including the same working parts and assemblies. A grooved roll arrangement, associated with the tandem-configured swaging units, is used as a preliminary step to form an initial metal tubing stock into a multiple-stepped shape.
Claims4
A method of forming a tapered multiple-stepped metal tube in a single-pass swaging operation, comprising:
- providing a swaging machine having a plurality of individual swaging units arranged in tandem, each of said swaging units being operated independently of each other swaging unit, each successive one of said individual swaging units having a die set of progressively smaller diameter to form a corresponding longitudinal section of a multiple-stepped tube;
- operating a first swaging unit of said plurality of swaging units while introducing a tubular blank of uniform diameter over the length thereof to the swaging action of the die set of said first swaging unit;
- operating a second swaging unit of said plurality of swaging units while continuously introducing said tubular blank further through said first swaging unit and into said second swaging unit, whereby a section of said tubular blank which was reduced by the action of said first swaging unit is further reduced by the action of said second swaging unit;
- continuously introducing said tubular blank into the remainder of said plurality of swaging units until a section of said tubular blank which was first introduced into said first swaging unit is introduced into a final swaging unit of said plurality of swaging units arranged in tandem to form a multiple-stepped tube;
- and
- withdrawing the thus formed multiple-stepped tube back through said swaging units to remove said multiple-stepped tube from said swaging machine;
- whereby a tapered multiple-stepped tube having longitudinal sections of gradually reduced diameters is formed in a single-pass by means of a plurality of swaging units which are arranged in tandem.
4 more elements
A method of forming a tapered multiple-stepped metal tube in a single-pass swaging opertion, comprising:
- providing a rolling apparatus having a series of grooved roll sets, each of said grooved roll sets having a progressively smaller groove diameter;
- passing a metal tubular blank, of uniform diameter over the length thereof, into a rolling passage formed by said series of grooved roll sets;
- operating said series of grooved roll sets to cause said metal tubular blank to be formed into a multiple-stepped metal tube having longitudinal sections of gradually reduced diamters;
- withdrawing the thus formed multiple-stepped metal tube back through said grooved roll sets to remove said multiple-stepped metal tube from said grooved roll sets;
- providing a swaging machine having a plurality of individual swaging units arranged in tandem, each successive one of said plurality of individual swaging units having a die set of progressively smaller diameter;
- passing said multiple-stepped metal tube produced by said series of grooved roll sets into a working passage formed by each die set of said plurality of individual swaging units arranged in tandem;
- operating said plurality of swaging units arranged in tandem to cause said multiple-stepped metal tube to be worked by each die set to reduce said multiple-stepped tube to a tapered metal tube;
- and
- withdrawing the thus formed tapered metal tube back through said swaging units to remove said tapered tube from said swaging machine;
- whereby a metal tubular blank is formed into a multiple-stepped tube in a single-pass by means of a series of a grooved roll sets and is then formed into a tapered metal tube in a single-pass by a means of a plurality of swaging units which are arranged in tandem.
7 more elements
Dependencies are inferred from the claim text.