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Ultrasonic NDE for Surface Roughness

Published online by Cambridge University Press:  29 November 2013

D.G. Eitzen  and
G.V. Blessing
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Extract

In a number of materials processes, on-line monitoring of surface finish is important to control material quality or process integrity. In rolling some sheet steel into coils, the rollers are intentionally roughened so that a specified roughness range is transferred to the sheet. Then the end product sheet can be optimally spray painted. The rollers, however, eventually wear smooth. Currently, pieces of sheet are sampled by hand and if a piece is too smooth, the coils produced since the last good sample are problematical. In automated machining it is useful to know during the cutting process whether the part will have the required surface finish. More importantly, for a large class of automated machining applications, a dull tool can be defined as one which produces a rougher part surface.

Monitoring the finish of the newly cut surface could allow a decision to be made about changing the tool. For untended machining this could provide a strategy for tool management. The strategy would be much more efficient than the alternative of changing a tool after X hours when it might have lasted 10X hours were it in the upper 10% of the life curve.

To fulfill the need for noncontact surface finish measurement, optical scattering devices have been developed to provide a surface interrogation technique. However, this technique is significantly limited for many applications because the optical beam must interact with a dry surface. This makes its application very difficult in the harsh wet environment encountered in automated machining and in some metal sheet production.

Type
On-Line Nondestructive Evaluation
Information
MRS Bulletin , Volume 13 , Issue 4 , April 1988 , pp. 49 - 52
Copyright
Copyright © Materials Research Society 1988

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References

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