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WHAT IS SWAGING?

Mechanical autofrettage process

SWAGING: THE PRINCIPLES

Like hydraulic autofrettage, mechanical autofrettage (also called “swaging” or “olivage”) is used to prestress gun barrels and prepare them to withstand pressure well, without additional deformation, shot after shot.

The process involves forcing a “swage” (or “olive”)  through a barrel with a bore diameter smaller than that of the swage. This technique has been used for many decades since it makes it possible to rifle small-caliber barrels while calibrating their bore. It is still widely used in the English-speaking world for mechanical autofrettage of medium and large caliber gun barrels.

OUR SWAGING MACHINES

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THE SWAGE:
THE KEY TO A SUCCESSFUL PROCESS

The geometry of the swage (or “olive”) and the lubrication technology determine the residual stress condition, and therefore the barrel’s ability to withstand firing.

THIOT INGENIERIE designs and supplies the swages and tools required to ensure the swaging process runs smoothly. These services are provided in cooperation with the customer, as they are directly related to the interference imposed by the designer of the barrel. The push-bars are always adapted to suit the barrel bore diameter.

HYDRAULIC OR MECHANICAL AUTOFRETTAGE?

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