SU107607A1 - Cross rolling method in screw gauges of round shaped hollow blanks for ring products - Google Patents

Description

Transverse rolling methods in screw gauges of round shaped hollow blanks for ring products are known.

The peculiarity of the described method is the use of hot-rolled rod as the initial billet, from which the sleeve is first sewn and then the floor-shaped billet is rolled from the same heating. This method improves and cheapens the rolling process.

The scheme of the rolling unit according to the described method is shown in FIG. 1. The initial blank is a round hot rolled bar. Heated in a kiln / billet in a mechanized way is fed to a two-roll piercing mill 2, where the liner is pierced. The sleeve is stitched without additional heating by the mechanized method is transferred to a three-roll forming mill 5, the rolls of which have screw gauges. In a forming mill, transverse rolling is carried out in screw gauges on a mandrel of profiled blanks. Rolling can be carried out on a floating mandrel, whereby a shaped tube is obtained from the mill; or on a fixed axially mandrel (Fig. 2). In this case, the mill can carry out a complete separation of the rolled blanks directly in calibers, or with the help of a multi-disk flying saw (Fig. 3), which cuts off the blanks when they exit the rolls.

The normal process of forming blanks can be ensured only with the correct calibration of the rolling rolls of the forming mill.

The roll profile for rolling blanks from sleeves consists of three sections: preparatory, forming and calibrating (Fig. 4). The roll on the preparatory section of the caliber is a conical barrel with a cylindrical section. Landing on the mandrel and 1 small

compression of the liner wall. Thus, the preform is relatively accurate in size to the forming section of the caliber. The presence of the preparatory section allows the sleeve to be used as a blank instead of a pipe, which is obtained directly from the piercing mill. Forming and finishing areas of the caliber are cut along a helix. In the finishing area, the workpiece is sized and the ovality of the sections is eliminated. To ensure accurate dimensions along the length of the rolled billet, the exit from the caliber is carried out simultaneously along the entire length of the profile.

Subject invention

Claims (5)

1. A transverse rolling method in screw calibers of round shaped hollow blanks for ring products, characterized in that, to improve the process and reduce the cost of it, a hot-rolled rod was used as the initial billet, from which the sleeve is first sewn and then heated from the same rolls the floor profile blank. 2. A technique for performing transverse rolling according to claim 1, characterized in that, in order to improve the process, the workpiece is rolled on a mill piece and on a mandrel fixed to the axis and separated either directly in gauges or after rolling out of the rolls using a volatile multidisc the saw, while it is possible to roll the profiled tubes on a fixed axially and floating mandrel. 3. A device for transverse rolling according to claim 1, characterized in that, in order to clarify the dimensions of the section of the workpiece, there is a preparatory section of the caliber, in which the load is compressed before entering the helical gauge, due to the presence of a tapered barrel. The forming mill is defined by a liner obtained from the forgive mill. 4. Device for cross rolling on the PP. 1, 2 and 3, characterized in that, in order to obtain an accurate product profile, the screw-gauge flange is formed in such a way that the compressible metal is freely displaced along the rolling axis towards the entrance of the billet to the rolls. 5. Device for cross rolling on the PP. 1, 2, 3 and 4, characterized in that, in order to eliminate size variations along the length of the workpiece, the finishing section of the screw gauge is designed in such a way that it provides simultaneous output of the workpiece along the entire length of the profile. Scheme of the unit dt rolling profiled / prdbnyh blanks ring and otupochnyh products Scheme of the rolling unit al Lee