JPS564009A - Method of measuring upset quantity of electric seam-welding tube - Google Patents

Abstract

PURPOSE: To make it possible to measure the upset quantity of an electric seam- welding tube continuously with a high reliability by continuously measuring the gap between rolls of an ultimate fin pass roll and a gap between squeeze rolls.

CONSTITUTION: A gap G₁ between the rolls of an ultimate fin pass roll 4₃ and a gap G₂ between rolls of a squeeze roll 5 are respectively measured continuously during the tube making operation. On the basis of various elements such as these gap values G₁ and G₂ and the hole molds of both rolls 4 and 5, the difference Δl between each part of the peripheral length l₁ of the tube when the tube passes the ultimate fin pass roll 4₃ and the peripheral length l₂ of the tube at the time of passing the squeeze roll 5 is sought. The gap values G₁ and G₂ are supplied succeeding operating machines 8 and 9, and the output value l₁ from the operating machine 8 enters a delay device 10, and supplied in a subtracting unit 12 together with the peripheral length value l₂ after the welding, the subtracting unit 12 calculates the upset quantity Δl by l₂-l₁=Δl.

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