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Stressvoyager Ultrasonic Needle Forming Straightening

Ultrasonic Needle Straightening or Forming:

Straightening operation usually consists in achieving the designed shape of a metallic component or structure (Here a thin sheet). This operation could be done using heavy load pressing machines. For finition tasks, or when a distorsion is observed after a machining or a chemical process, to achieve with precision the curvature of a part by compring it to the jig, most common tool is a simple peen hammer.

Using such a tool implies a long process time, and could cause musculo-skeleton diseases for the operators.

Ultrasonic Needle Straigthening technique is a proven and reliable alternative of the peen hammer, with less impact for the operator.

Efficient process control, quick and easy-to-use tooling make this new technique popular.


Forming operation consists in modifying the shape of a metallic sheet to progressively achieving a desired shape.

Following schematics describes the Ultrasonic Straightening or Forming process principle:

Needles guided inside the peening head acquire velocity on the vibrating sonotrode and shock the metal to treat. A compressive stress layer is created on the surface. The difference of stresses between the surface and the core of the metal sheet result in a sheet curvature modification. By peening on the appropriate areas, one could adjust the part shape to its objectives (jig).