| 摘要 |
<p>PURPOSE:To manufacture a perfectly round pipe of small wall thickness deviation, by calculating a deformation-resistance value from the temp. distribution in the circumferential direction of a blank rolling material and adjusting a rolling reduction and a plug position of a rolling mill basing on the calculated value, in manufacturing a seamless pipe. CONSTITUTION:In manufacturing a seamless pipe by hot rolling a blank rolling material 1 with barrel type rolling rolls 2 and plugs 3, a temp. sensor 5 is provided to the front of a rolling mill to measure the surface temp. of the rotating material 1 just before rolling. The measured value is inputted to a controlling device 6 to be stored, and at the same time, a signal indicating the number of revolutions of a roll 2-driving motor 4 is also inputted to the device 6. The temp. change in the circumferential direction of the material 1 is read from the measured value obtained by the sensor 5 and further, necessary rolling load is obtained; from these values, the rolling reduction and the plug position are controlled by a driving device 7 to manufacture a perfectly round seamless pipe without wall thickness deviation.</p> |
