SU1729634A1 - Method of diagonal rolling of square cross-section blanks - Google Patents

Abstract

The invention relates to metallurgy and can be used in the calibration and rolling of various profiles using diagonal rolling of a square billet. The purpose of the invention is to increase productivity by simplifying the turning of the workpiece. When rolling a square billet in a sliding caliber, one of the lower corners is performed with a radius of lesser curvature than the others, and then it is rolled in a diagonal square caliber with the task of this angle into an open stream. In addition to an open stream with an obtuse angle, the diagonal gauge has a closed stream with a right angle. Simplification of kantovka billet is carried out by creating the conditions for its spontaneity. 3 il. sl C

Description

The invention relates to metallurgy and can be used in the calibration and subsequent rolling of various profiles using diagonal rolling of a square billet.

The purpose of the invention is to increase rolling productivity.

FIG. Figure 1-3 shows a flow chart for the method of rolling a square billet to a diagonal.

According to FIG. 1, the caliber preceding the diagonal is made in the case of a (a) and diagonal (b) types. One of the lower corners of these calibers is made with a radius of a larger value (R) compared with the other angles (g). This angle is rolled in the open stream of the next diagonal gauge.

In FIG. 2, a thick line denotes a diagonal caliber formed by closed and open streams with a right angle at the apex of a closed stream and an obtuse angle at the apex of an open stream. The square in accordance with the proposed method enters it diagonally with a lower rounding of the angle with a radius of larger size. The thick dotted line below shows the outline of the other corners of the given square.

A thin solid line on this caliber is superimposed on the plate coming into this caliber square with the lower left corner, made a radius of greater magnitude. The thin solid line somewhat conditionally shows the position of the caliber streams at the moment of capture. Component roll pressures toward roll toward peripheral speeds

vj you are about

are indicated by solid arrows of forces P at the points of contact of the rolls with the roll. On the right side of the figure, force P balances each other to some extent, and on the left side, force P is directed only downward, since there is no opposition from the lower stream (this corner of the square billet is made with a larger radius and this angle is located at a distance of NI K). Under the action of force P, a moment Мр arises, which, acting counterclockwise (shown by a thin solid arrow), dumps the roll up until it touches the lower left corner of the square roll of the lower gauge stream. The new position of the roll, scanned at some angle, is shown with a thin dotted line. In this case, the contact of the roll with the sides of the caliber brooks is performed by all four corners, but at different horizontal levels.

The vertical components of these forces are shown by dotted arrows. Forces that are at a lower horizontal level with respect to the axis of the rolls have a lower peripheral speed, are indicated by Rm and form a pair of forces that tend to turn the bar out clockwise. Forces located at a higher horizontal level are of a greater magnitude, indicated. RB and make up a couple of forces, which tend to turn the roll counterclockwise. The difference of these moments (Mr. B - Mr m.), Acts counterclockwise in one direction with the considered moment Mt.e. It continues further destabilization of the roll up to a diagonal position with a lower angle with a large rounding radius in an open stream of a diagonal caliber.

The magnitude of the larger rounding radius (R) is determined depending on the radius of the remaining angles (g), the angle of inclination of the lower stream (/) of the next diagonal gauge and K, which characterizes in Figure 2 the gap between the lower strand of the diagonal caliber and the surface rounding the corner of the workpiece of a lesser curvature (with radius R, fig.Z).

The specified values of the clearance K from the edge of the lower brook of the gauge to the rounding surface of an angle with a radius R are determined from the condition of the initial rotation of the roll in the diagonal caliber by an angle of 3-6 ° and with a range of radii in squares equal to 0.10-0.33 from the side C where C is the side of the square.

The initial rotation of the roll in the diagonal caliber in the task of its caliber

The flat, equal to the angle of 3-6 °, is sufficient so that at the time of the beginning of the rolling out of the roll the rollers lose stability and turn in the caliber to the alignment of the vertical axes of symmetry of the caliber and the roll. Example: When rolling a circle with a diameter of 105 mm made of steel SHK-15 on a mill 450, a square billet with a section of 160x160 mm is heated to 1220 ° C and rolled in four gauge types to a square section with a side dimension of 122x122 mm Angles g 35 mm, with a large diagonal of 144 mm. The magnitude of the large rounding radius is determined by the well-known relationship, and the K value is 5 mm.

 351-1, 41 -COS (45 ° -0

535 - (- 20.9) 1-1, 41 cos (45 ° -10 °) 55.9 mm.

Take the value of R equal to 56 mm. At the same time, one of the square semi-diagonal decreases by 0.41 (56-35) 8.6 mm, i.e. instead of 72 will be 63.4 mm. The reduction of the square to the diagonal in the diagonal caliber will also decrease by 8.6 mm, i.e. compression instead of 20 is 11.4 mm. In this case, the angle of rotation of the roll in caliber at the time of capture will be about 5 ° 0b.

The use of the proposed method of rolling a square billet to a diagonal provides, in comparison with the known ones, a reduction in physical effort when tilting a square billet to a diagonal or ensuring its spontaneous canting; reducing the amount of compression and reducing the cases of slipping of the strip by rolls; productivity increase.

At the same time, the possibilities of rolling production in improving rolling stability of a whole range of profiles are expanded, since the method can be used not only when rolling in diagonal gauges of various profiles, but also in intermediate gauges, for example, using the square-diamond-square diagonal system.

Claims (1)

Invention Formula The method of rolling a square billet to a diagonal, including obtaining a square billet in a slider or diagonal caliber and its task from flat position with 45 ° turning to a diagonal caliber formed by closed and open brooks with a right angle at the apex of the closed brook and obtuse angle at the apex an open stream, characterized in that, in order to increase productivity by simplifying the turning of the workpiece, one of the half-diagonal of the square workpiece is made shorter by rounding one of the lower corners behind otovki smaller radius of curvature than the other in its corners, or bevel, and this corner rolling is carried out in an open stream diagonal caliber. qfa-L Editor M. Kelemesh fig a Compiled by I. Sharapov Tehred M.MorgentalKorrektor I. Muska