| 摘要 |
In the tube manufacturing industry, five general methodologies for manufacturing tubes are known at this time. The first is under an extrusion of molten metal by means of a press. The second is by means of a rotary lamination system known as "Piercing" or "Mannesmann". The third is the welded pre-tube that is obtained from a laminated strip. The fourth, known as the "Cast & Roll" system, whereby a pre-tube, obtained directly from the melting, is laminated by a triple roller system. Finally, the innovative manner whereby a continuous vertical casting manufactures pre-tubes continuously, directly from the melt. The four first systems are widely used in the industry to manufacture what is known as a "pre-tube" that usually has a diameter of 60 mm or higher, which we shall name "old pre-tube". Different processes are applied to that old pre-tube to bring it to smaller diameters and thicknesses finally required by the market. The invention set forth in this specification considers implementing a production process through a productive line of a continuous vertical casting machine that produces a direct pre-tube from the melt, which we shall call "new pre-tube". Later, as a second step, that new pre-tube passes through two simultaneous, synchronized wiredrawing machines and finally, through an induction annealing furnace. Thus, a product can be obtained for commercialization that complies with international standards, which can be reduced to a smaller size by wiredrawing it using the customary processes of the industry. |
