Method and apparatus for measurement of the eccentricity of a hot-manufactured, seamless tube in the production

摘要

A process for the measurement of the eccentricity of a hot-manufactured seamless pipe made of steel in the production, in which the tube as a hollow block tube made of a solid block or has already been produced from a hollow block tube is made, wherein the solid block or the hollow block tube above the curie - temperature is heated and is rolled with the use of an inner tool; and the inner tool during the rolling, a temperature below the curie - temperature, and the block or the hollow block tube by the rolling mill or by means of the axially stationary inner tool is transported, characterized in that, directly after it emerges from the rolling mill by means of eddy current excitation magnetic fields of both into the tube as well as in the inner tool are induced, as a function of temperature in the case of the different magnetic permeability of the heated pipe and of the occurring of an eddy current signal is detected, and used to continuously the eccentricity of the inner tool relative to the tube is determined.