RU1810140C - Sheet manufacture method - Google Patents

Abstract

Usage: rolling production can be used in sheet production. SUMMARY OF THE INVENTION: on an intermediate roll produced on a crimping mill by vertical rolls, side edges of each section equal to the width of the corresponding finished sheet are profiled. The profiling depth is determined according to the mathematical expression. After profiling along the formed thickenings, the workpiece is cut and subsequent rolling is carried out in a direction perpendicular to the longitudinal axis of the workpiece. Such a profiling method allows forming lateral faces of a rectangular shape during transverse rolling and prevents crack formation at the edges. 4 ill. 1 tab.

Description

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WITH

The invention relates to sheet rolling production and can be used on a sheet mill, supplemented by a crimping mill with vertical rolls, or a complex of 1 continuous caster.

The purpose of the invention is to improve the quality of rolled products by eliminating the defect of a torn edge when rolling sheets.

The goal is achieved by the fact that in the method of manufacturing sheets, including profiling on the workpiece in sections equal to the width of the finished sheet. thickenings, along which the workpiece is cut and subsequent rolling is carried out in a direction perpendicular to the longitudinal axis of the workpiece, profiling is carried out on the side faces, and the profiling depth is determined by the formula

B 443 (f747-55,

where But is the initial thickness of the intermediate tack, mm;

D is the diameter of the rolls of the rolling mill, mm; .

I is the coefficient of drawing during rolling.

This sheet production method provides the same roll form as the prototype, but the quality of the rolled product is improved by eliminating the flawed edge defect. This occurs as a result of favorable conditions for deformation of the marginal sections of the roll in horizontal rolls. When using the prototype method, the edge sections of the roll have an increased thickness compared to the middle part of the roll, which, when deformed in horizontal rolls, causes an additional00

about

2 o

tel. napr, h and defects torn edge.

In Fig. 1, the profiling of the ingot-billet according to the inventive method is shown: in Figs. 2-4, the shape of the intermediate tack before rolling on the sheet mill and the shape of the finished sheets with defects at the edges after rolling by the known and inventive methods.

The invention is as follows. By rolling transversely profiled along narrow edges of a flat in the cross section, while not allowing the formation and expansion of the thickened side faces of the intermediate rolled, a sheet is obtained that is close in plan to rectangular.

PRI me R. At mill 1500 of the Ashinsky Metallurgical Plant, 3x1000x2000 sheets are rolled from a billet of grade 12X18H10T, divided into 3 groups of various shapes. Of these, two groups of known blanks (FIGS. 2 and 3) and one of which are claimed (FIG. 4). The initial dimensions of the workpieces

hxbx 1 27x250x1005 mm.

The profiling depth of the wide edges of 0.8 mm (Fig.Z), narrow by the formula

V-LU11 (lO.747. /27u0.55 - about os las

НтРГУVT / - lo, JD lO, O

MM

The reduction mode during rolling of the experimental slabs is given in the table.

The shape of the sheets in plan after rolling according to the known method (figure 2) dictates

5

0

5

0

5

lateral and frontal clipping. The sheets rolled according to the known method (Fig. 3) have a plan shape close to rectangular, however, rough flaws are fixed at the edges at an angle of 45 °. The sheets rolled according to the inventive method (Fig. 4) have a plan shape close to rectangular and without edge defects.

Claims (1)

Experimental studies have shown that the inventive method for producing sheets allows one to obtain a sheet shape in plan close to rectangular and to avoid the formation of a defect in a torn edge. SUMMARY OF THE INVENTION A method for producing sheets, including profiling on a workpiece in sections equal to the width of the finished sheet, thickenings along which the workpiece is cut and subsequent rolling is carried out in a direction perpendicular to the longitudinal axis of the workpiece, which differs in that. in order to improve the quality of rolled products by eliminating the defect of a torn edge, profiling is carried out on the side edges, the profiling depth is determined by the formula  b -443 () 0.747 -A-0.55, where But is the initial thickness of the intermediate tack, mm; O is the diameter of the rolls of the rolling mill, mm; A is the drawing coefficient during rolling.