SU1316721A1 - Method of manufacturing t-sections and working stand for effecting same - Google Patents

Abstract

The invention relates to the processing of metals by pressure, more specifically to the rolling of small cross-sectional profiles. The purpose of the invention is to provide the possibility of producing profiles with a continuous plate, a cross section of less than 10 mm, as well as centering the workpiece. According to the invention, the rolling of a T-shaped profile is carried out in one pass from a round wire billet with its compression between a calibrated 1 and a smooth 2 rollers. For the exact task of the preform 4, it is preliminarily guided into the gauge into a roll 1, which it bends around an arc of 15-30 °. For this purpose, a yushi roller 3 with a V-shaped stream is installed, mounted with mixing in a vertical plane relative to the axis of rolling. Accurate centering of the workpiece allows you to reliably obtain a profile with shelves of equal width. 2 sec. f-ly, 2 ill. I (L with Oi 1чE

Description

The invention relates to the processing of metals by pressure, namely, the rolling of small cross-sectional profiles.

The purpose of the invention is to provide the possibility of producing profiles with a cross-sectional area of less than 10 mm, as well as centering the workpiece.

The method is as follows. Rolling is carried out in a two-roll stand. On the block of one cylindrical roll, a T-shaped caliber of specified dimensions is cut, the barrel of the second roll is smooth. To manufacture a symmetrical profile, a T-shaped protrusion of the product is formed by rolling in a brook embedded in the middle of the gauge. The deformation is performed in one pass, the roll barrels being pressed together with a force exceeding the metal pressure on the rolls. A blank for the manufacture of profiles with a cross-sectional area of less than 10 mm is round wire with a diameter of up to 4 mm. Profiles can be made of a material that allows for its relatively large compression.

FIG. 1 shows a cage, a general view; in fig. 2 shows section A-A in FIG. one.

FIG. 1 and 2 marked: 1 - mill roll with a profile caliber;

2- roll with a smooth barrel;

3- guide roller; 4 - wire preparation.

A necessary condition for obtaining a profile with shelves equal in width is a strictly rectilinear entry of the wire into the deformation zone when the axis of the billet wire coincides with the axis of the cut gauge.

If the axis of the wire deviates from the axis of the gauge, the distribution of the metal to one of the sides will shift with a corresponding change in the width of the T-shaped shelves. Moreover, due to the unstable entry of the wire into the deformation zone, the width of the shelves can vary in one direction or the other until the entire metal falls into smooth sections of the roll barrel.

The wiring used in the high-grade rolling cannot ensure proper recirculation of the wire into the deformation zone due to its very low stiffness. The required centered entry of the wire into the roll gauge during rolling is achieved as follows.

A wire with back tension, which can be provided, for example, by a correct device, is passed through a wiring made in the form of a freely rotating roller with a brook. The roller is set along the axis of the gauge in front of the cage so that the wire bends around the roll with the T-shaped gauge under

0

angle of 15-30 ° with respect to the horizontal axis of the rolling stand.

As a result of these conditions, the wire is securely positioned with the side edges of the T-shaped cut through the center of the roll gauge. Moreover, reliable centering is provided even in the case of a narrow T-shaped incision in the roll caliber compared with the diameter of the billet wire.

Without skirting a roll with a gauge, no other conditions ensure correct and reliable entry of the wire into the deformation zone.

With a decrease in the bending angle below 15 °

5 is reduced to guarantee the stability of the wire in the roll caliber, more than 30 ° roll around the roll is impractical due to design considerations. In addition, as the length of the contact of the wire with the roll increases

Q decreases the tension of the wire from the beginning of the contact to the deformation zone, which also reduces the guarantee of reliability of centering along the edges of the T-shaped groove.

Rear tension is necessary to ensure that the liver is straightened by the movement of the wire after the guide roller. A sufficient anti-back force is its effect in the range of 0.1-0.2 bph.

According to the invention, batches of T-shaped profile from nickel silver with high accuracy of the following dimensions were released on the mill: width 3.54-0.12 mm; shelf thickness 0.25-0.03 m.m; the height of the rack along with the thick, other shelves 0.40-0.06 mm; wall thickness 0,8-0,06 mm. The cross-sectional area of the profile is 1.0 mm. The blank is wire with a diameter of 1.26 mm. The tensile strength of the metal kg / mm 2.

The mill rolls have a diameter of 130 mm and a width of 50 mm. When rolling rolls are tightly pressed to each other. When refueling the mill

0 The wire is manually fed to the gauge of the rolls during short-term start of the mill. Then, the tucked wire is placed in a stream of the guide roller. Before the roller is installed the correct device,

5 consisting of two sets of rollers (horizontal and vertical) of 11 pcs. Each. in each. This device creates wire resistance up to 10 kg. A roller with a diameter of 45 mm is mounted on a separate rack above the rolling line at 40 mm and at a distance from the vertical plane passing through the roll axes of 90 mm, which makes the pro-blocking angle relative to the gauge about 25 °. The roller can be moved in a vertical plane to adjust the angle of coverage of the wire roll.

Claims (2)

Claim 1. Method of manufacturing T-shaped profiles, including the direction of the workpiece Q five into a two-roll gauge and rolling between a calibrated and smooth rolls, characterized in that, in order to enable the manufacture of profiles with a cross-sectional area of less than 10 mm2, rolling is carried out from a round billet in a single pass with a curvature round the blank an angle of 15-30 °, and with a back tension equal to 0.1-0.2 of the yield strength of the workpiece. 2. A rolling stand for making T-profiles, comprising two rolls and a guide roller, characterized in that, in order to center the workpiece, the guide roller is made with a V-shaped stream and installed in front of BaviKaMH so that the overall tangent to the forming roller and calibrated. roll is located at an angle of 15-30 ° to the horizontal plane. t 2