SU1630865A1 - Method for producing combined structural sections - Google Patents

Abstract

The invention relates to rolling production and can be used on high-grade rolling mills in the production of varietal profiles, rolled in a combined form. The purpose of the invention is to improve the quality of surfaces in the separation zone. In the process of rolling profiles in the combined form according to the invention, during the formation of stress concentrators in the separation plane of the blanks, the planes of the concentrators are initially formed at an angle of 15-25 °. to the vertical axis of the aligned profile, and then align these planes vertically along the separation line due to broadening. Improving the surface quality of the finished profile in the separation zone is achieved by eliminating the direct shearing of the parts of the workpiece during the formation of stress concentrators. 3 or Ј (/

Description

The invention relates to rolling production and can be used on high-grade rolling mills in the production of varietal profiles, rolled in a combined form.

The purpose of the invention is to improve the quality of surfaces in the separation zone.

FIG. Figure 1 shows the third gauge against the rolling stroke, after rolling in which the plane of the stress concentrators is inclined to the vertical axis of the aligned profile at an angle of 15-25 °; in fig. 2 - prefine gauge, at the exit of which the plane of the stress concentrators are located in the same vertical plane; in fig. 3 - the form of the finishing caliber and the cross section of the double profile that emerged from it with the upper and lower longitudinal stress concentrators.

The method is carried out as follows.

In the production of varietal profiles, the plane of stress concentrators and the connecting bridge are formed due to the natural broadening of the metal during deformation in the pre-caliber and carried out in two stages.

In this case, in the caliber shown in FIG. 1, the parts of the aligned profile are shifted relative to each other while simultaneously bending the end of the profile in the opposite direction to the shift. The planes of stress concentrators are inclined in the vertical axis of the combined profile at an angle of 15-25 °.

In the preparatory caliber (Fig. 2), the planes of stress concentrators and the connecting bridge are finally formed. No profile parts are shifted in this gauge, only the profile is deformed in height. Due to the natural broadening during deformation, the gauge is filled, the planes of stress concentrators are located opposite each other in the same vertical plane. Since there is no shearing operation, the wear of the cutting edges

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does not occur, with the result that the connective jumper is a vertical line ab (Fig. 2) without radii, which is used to counter-shift and then split the combined profile, which improves the quality of the finished profile in the separation zone.

In the finishing caliber (Fig. 3), parts of the profile are aligned to the initial position. Bending the end of the profile in the direction opposite to the shear ensures that the plane of the stress concentrators is vertical after the anti-shear. The range of angles of inclination of the plane of stress concentrators is selected from the condition of filling the pre-finishing gauge due to the natural broadening of the metal during deformation.

In the event that the tilt angle of the plane of stress concentrators exceeds 25 °, then the broadening during rolling in the pre-gauge caliber is not enough to fill the gauge, since the planes of the stress concentrators will not be in the same vertical plane, which reduces the quality of the finished profile after separation. .

If the angle is less than 15, then in the pre-caliber there will be an overflow, which also leads to a decrease in the quality of the finished profile.

Example. As an example of a specific implementation of the method, let us consider the production of 6X65 and 20X50 strips from ZOHGSA steel, rolled in twin form at mill 400.

Production method of strip 6X65 mm. Rolling lead for 7 passes. From a billet of mm and mm in size, in four passes, according to the technology adopted at the mill, a roll of the size, 6; H 13.6. In the fifth and sixth passages, stress concentrators are formed, in this case a roll is obtained with a tilt angle of the stress concentrator plane of 25 ° (Fig. 1), and in the sixth passage the plane of the stress concentrators is aligned with the vertical axis of the profile ( Fig. 2). In the fifth passage, one part of the profile is shifted relative to the other by the value of mm, the end portion of the strip is bent in the direction opposite to the shift by the amount of shift, i.e. by 6 mm, a roll of 2B 128.8, 5 was obtained. After rolling in the sixth (pre-finishing) caliber, the strip has dimensions equal to 8; ,five; the magnitude of the shift is mm, the plane of the stress concentrator is aligned with the vertical axis of the profile.

After rolling in the finishing caliber (FIG. 3), parts of the profile are combined to

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the initial position and the profile having a width of 5 mm and a height of 6 mm is subjected to cold separation by one of the known methods.

Production method of strip 20X50 mm.

Rolling lead for 5 passes. According to the traditional scheme for two passes from the workpiece, get a roll size, 5 mm; mm In the third and fourth passages, stress concentrators are formed; in this case, a roll is obtained in the third pass with a tilt angle of the stress concentrator plane equal to 15 °, and in the fourth passage these planes are aligned with the vertical axis of the profile.

In the third pass, parts of the profile are shifted by the value of mm; on 27 mm. The result is a roll size 2B 94 mm; mm After rolling in the fourth (pre-finishing) caliber, the dual profile has dimensions: mm; H 24 mm, the magnitude of the shift is mm, the planes of the stress concentrators are aligned with the vertical axis of the profile.

5 After rolling in the finishing caliber, parts of the profile are combined to the initial position and the profile having a width of 3 mm and a height of mm is subjected to cold separation by one of the known methods.

0 The economic effect of using the proposed method is achieved by improving the quality of the surface of the finished profile in the separation zone, i.e. due to the exclusion of the direct shift operation of the blanks during the formation of concentrators

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Claims (1)

Invention Formula The method of production of varietal profiles 0 in a combined form, which includes introducing stresses in a vertical separation plane before separating the precursor stresses by a relative shift of parts of the roll with bending of the end sections of the profile in the direction opposite to the shift, and their subsequent alignment with each other to the initial position, characterized in that, in order to improve the quality of the surfaces in the separation zone, during the initial shift of the workpieces, the plane of the stress concentrators is performed - 0 inclined to Vertical, combined axis of the profile at an angle 15-25 ° inside the preform, and then these planes are aligned with the vertical axis of the profile line of separation. Phys. 1  2 Yu Fig.Z