Excessive Knife Wear – Failure Analysis

Since 1983 Touchsone Research Laboratory has provided fast, accurate and affordable failure analysis to a wide range of industries – from underground mines to advanced spacecraft.

Excessive Knife Wear

The manufacturing of cut nails was automated in the USA. A nail machine was developed with three parts: flat metal strips are cut in long- thin- triangular shapes, holding the nail, and forming the head. The metal strip is then turned 180 degrees to cut the next nail strip. Although this process is much slower than wire nail manufacturing, cut nails are still used today for unique applications such as masonry and some decking applications.

A cut nail manufacturer reported excessive knife wear on nail cutting machines used in their nail manufacturing process.

Touchstone performed a thorough metallographic examination of the sheet samples and determined that a significant amount of mill scale had been forced into the sheet during shotblast cleaning.

Because of the high hardness of the mill scale, excessive knife wear occurred.

Changes in the shot-blast procedure were suggested to increase the efficiency in the scale removal process.

This is one example of numerous industrial problems and failure analyses Touchstone has conducted.

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