paisumistöötluse

Paisumistöötlus, also known as expansion processing or blooming, is a metalworking technique used to enlarge the diameter of a cylindrical workpiece, such as a pipe or a tube, without significantly altering its wall thickness or length. This process is typically achieved by inserting a specialized tool, often called a mandrel or a plug, into the hollow of the workpiece. The workpiece is then subjected to external pressure, either through mechanical means like rollers or hydraulic pressure, or through controlled heating.

The external force causes the workpiece material to deform and flow outwards, expanding over the inserted tool. This controlled expansion results in a larger outer diameter while the material essentially stretches, maintaining a relatively constant wall thickness. The process is often used to create larger diameter pipes from smaller ones, or to achieve specific dimensional tolerances. It can also be employed to improve the mechanical properties of the material by inducing work hardening. Paisumistöötlus is a versatile technique applicable to a range of metals and alloys.