SQUEEZE QUANTITY MEASURING AND CALCULATING METHOD AND CONTROL METHOD FOR RESISTANCE WELDED TUBE

Japanese Patent JP2803928

B2

PURPOSE: To continuously measure, calculate and control the squeeze quantity during welding by picture-processing an image of a seam convergence part photographed by an image pickup device, obtaining the distance from a V convergence point to the squeeze roll center and an apex angle and calculating the squeeze quantity.
CONSTITUTION: In resistance welded tube manufacturing equipment, the seam convergence part 3 is photographed by the image pickup device 7 using an optical lens 6, etc., from above a seam weld zone. This image is inputted to an image analyzer 9 as an analog picture signal, picture processing is performed by utilizing the luminance difference of a picture and the distance L from the V convergence point to the squeeze roll center and the apex angle θ are calculated. The calculated result is inputted to a signal converter 15 having a comparator 14, compared with the preset squeeze quantity and calculated and converted into a control signal to control the squeeze quantity. This control signal is inputted to a squeeze quantity control system 17 to control the squeeze quantity. Accordingly, the squeeze quantity of the resistance welded tube can be measured, calculated and controlled with high accuracy and high efficiency.

Masayuki Suehisa
Kashiwamura Hideki
Nobuo Mizuhashi
Hirofumi Okuda
Kuniomi Sakata
Kiyoshi Matsui

JP26737091A

September 24, 1998

October 16, 1991

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Nippon Steel Corporation

B23K13/00; B23K13/08; (IPC1-7): B23K13/08

JP59223183A
JP50122442A

Tomoyuki Yathata (1 outside)

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