INFLUENCE OF DEFORMATION ON THE MECHANICAL PROPERTIES OF TIN-PLATED TIN
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Abstract
Annotation. The influence of deformation on the mechanical properties of the characteristic layers of tin plate when a through hole is pierced in it is considered. Graphic dependences are obtained showing the change in the microhardness of the outer and inner layers of tinned tin along the thickness of the sheet material depending on the angle of its bending, the integrity of the outer tinned layer of tinplate in the finished product is studied. It has been established that the integrity of the coating is preserved up to the point of plastic rupture by the piercing of the press in the central part of the workpiece. An analysis of the distribution of microhardness values showed that the inner layer has higher values than the outer ones, the maximum value of the hardening degree is observed in the outer layer (+17,1%). At values of the bending angle of more than 150 degrees, the values of the degree of hardening in all layers tend to the same value (approximately 12,75%). Analysis of the graph of changes in the degree of hardening of the sheet layers along the bending line of the sample showed that the degree of hardening of the middle layer occurs with any change in the shape of the sheet material, regardless of the degree of hardening of the outer layers.
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References
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