SU1243849A1 - Method of lengthwise separation of double section in passes - Google Patents

Description

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The invention relates to metallurgy, in particular, to the technology of rolling shaped profiles on section rolling mills.

The purpose of the invention is to improve the quality and accuracy of the profiles while increasing the productivity of the mill.

Figures 1 to 4 show the sequence of formation of the connecting bridge with its subsequent destruction with the mutual mixing of the folded sections of the profiles to their initial position.

 A preliminary notch in the zone of future separation is carried out with the aid of an annular ridge 1 while simultaneously turning the parts 2 of the profile in the direction of the notch (Fig. 1). In the next caliber, the final cabbage of the connecting lintel is formed and the sections 2 profiles are rotated towards the notch (Fig. 2). In the following gauge, (fig.3), the connecting lintel is weakened by returning one of the bent sections to coaxially .: e with rollers position with simultaneous fixation of the caliber of the second bent portion. In the last caliber (Fig. 4), the destruction of the connecting bridge was achieved by returning the second bent section to a position coaxial with the rollers while fixing in the caliber, the previously bent section. This method of alternately returning each of the bent sections to a position coaxial with the rollers in the last two calibers ensures reliable fixation of one of the divided profiles at the moment of capture, the verticality of the end planes of the profiles in the separation zone, eliminates the longitudinal twisting of the strips and, as a result, allows you to avoid different widths of divided profiles.

I Example. Take an elevator profile. Yugtsi number 2, rolled on a large-sized mill 750, From a rough gauge caliber, the roll is set into the fourth shaped gauge, in which the annular ridges at the site of the future separation make a metal cut and rotate the heads of the profiles towards the upper roll (FIG. .one). Average

2438A92

The draw in this caliber is 1.4. The resulting roll of the fourth caliber set in the third caliber, where with the help of ring ridges

5 form the final value of the weakened cross-section (jumper), equal to 3 mm. The elevator guide profile heads are re-rotated in the direction of the upper roll so that

to an angle of 92 °, and an angle of, 95 of FIG. 2, With an average draw ratio in caliber of 1.32, angles from (, 92 and 95 °) provide in the following calibers (in the second and first) calibers

15 quality and 1x edges and verticality in the zone of future separation. Next, the roll obtained in the third caliber is applied to the second pre-finishing caliber, where the head of the right profile

20 lift guides return

in the initial horizontal position, weakened connecting bridge before its destruction, strictly fixed, .ru while the horizontal size and

25, the verticality of the face plane | FIG. 3),

The average stretch ratio in this caliber is equal to 1, 25, which ensures the stability of the dual profile of elevator guides in this

30 caliber. The roll out of the second caliber is then set to the first finishing caliber, B which is the head of the left profile; return to the original horizontal position, where the horizontal dimensions are strictly fixed, the position is relative to the right profile and the verticality of the face plane (figure 4). In the finishing caliber the average stretch ratio is 1.22, including: 1.12, at the base of the profile is 1.30. This inequality in the stretch coefficients ensures the straightness of the exit of the separated profiles of elevator guides from the finishing gauge. It was established that in order to improve the quality of edges and the verticality of the face planes in the zone of separation of angles s at vertsinah, to unscrew one of the rolls hundred- portions should be us to the site to be recovered first, ot 94-100 °, vtorym- «- 91-96 °. In order to ensure the linearity of the output of the separated profiles, the coefficient of the distant section should be 1.2–1.4 times greater than the section immediately adjacent to the section of the double profiles.

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Compiled by E.Dmitriev Editor S.Lisina Tehred I.Popovich Proofreader

Order 3743/11 Circulation 518Subscription

VNIISH State Co. Of USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Production and printing company, Uzhgorod, st. Project, 4

Fig.Z

Phie. four.

Claims (1)

METHOD OF LONGITUDINAL SEPARATION IN CALIBERS OF DOUBLE PROFILES, including combined rolling of profiles, preliminary unilateral formation of a bridge between them by cutting the crest of the roll, final formation of a bridge by mutual separation of profiles by bending at least one of the sections adjacent to the zone of the bridge, and destruction of the bridge the reduction of these sections, characterized in that, in order to improve the quality and accuracy of the profiles after separation, before the final formation of jumpers and the sections of the profiles adjacent to it are simultaneously bent towards the notch, and the mutual dilution and mixing of these sections is carried out by correspondingly fixing them in caliber. SU <„, 1243849 A ί '1243849