Apparatus for calibrating tubular articles
AssigneeAB Carbox
InventorBjorn O. A. Pettersson
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Abstract
An apparatus for calibration of tubular articles, especially cylinder linings for internal combustion engines, manufactured through isostatic compression of pulverulent metallic materials, comprises piston means for effecting an axial displacement between the tubular article and a mandrel which it surrounds during the calibration. Preferably, the tubular article is first subjected to a rather modest radial inwardly directed pressure which is increased after an axial relative movement between the mandrel and the tubular article has taken place.
Claims8
Apparatus for calibrating a tubular article (1) made of a pulverulent metallic material which has undergone isostatic pressing and a subsequent sintering operation, comprising:
- an isostatic press which has a central mandrel (2) on which is mounted said tubular article;
- means (3, 4) for applying a first press force to said tubular article mounted on said mandrel, said first press force acting radially inwardly towards said mandrel;
- means (7, 8) for applying an axially directed force to said tubular article (1) after application of said press force to cause an axially oriented relative movement between said tubular article (1) and said mandrel (2);
- and
- means for applying a second press force to said tubular article after application of said axially directed force, said second press force acting radially inwardly towards said mandrel and being of greater magnitude than said first press force.
Dependencies are inferred from the claim text.