SU551077A1 - Method of making bent box profiles - Google Patents

Description

one

The invention relates to the processing of metals by pressure, in particular to the production of curved rolled sections.

A known method of making box profiles using the simultaneous free bending of the side walls and closing shelves.

This method does not allow high-quality shaping of the profile bending points and obtaining the required curvature of these places on the finished profile and stable size between the edges of the profile shelves,

There is also known a method of manufacturing box profiles, in which lateral compression of the workpiece is provided by the effect of a roll on the edges of the workpiece.

In the process of profiling, the bending of the side walls and shelves is performed simultaneously, and at the free bending stage, when the upper roller is not in contact with the inner surface of the bend sites, the side walls of the profile bend outward, and the deflection is chosen so that the deformation of the side walls from the deflection does not go beyond ate up elastic deformations,

The disadvantage of this method is the removal of the profile edges under the action of the roll elements during the creation of the transverse compression.

In addition, in a number of cases, the interlocking profile flanges under the action of the roll elements on the edges of the profile lose their stability, which does not allow to create the necessary efforts for the high-quality shaping of the bending places and giving them the required curvature. Therefore, in order to reduce the forces applied to the billet during molding according to a known method, the number of technological transitions is increased, which leads to an increase in the consumption of rolls, energy consumption for profiling, complication of equipment and increase in its weight.

The aim of the invention is to improve the quality of the profiles by ensuring dimensional stability between the edges of the shelves.

Claims (2)

To this end, at the first transitions on the workpiece, flanging is performed, then the buttocks and walls of the free bend are made flexible, and at the last transitions, when the shape of the profile is close to the final one, the bend and lateral compression of the shelves are made marriages and flanging After the profile has been manufactured, the flanging can be removed. The use of technological screening on the shelves of the profile increases the area of contact between the edges of the shelves of the profile and the rolls and allows increasing the forces transmitted by the shelves to the profile's bending points for high-quality shaping of the bending month without seeing the metal of the edges of the shelves where they contact the rolls. The use of technological flanging also allows you to distribute the transmitted force over a larger section of the shelf and thereby ensure the transfer of large forces without local loss of stability of the shelf. In addition, the presence of the flange increases the rigidity of the shelf and prevents the loss of its stability during application of lateral forces from the rolls. FIG. Figure 1 shows the technological breaks of the formation of a box-shaped Io profile; la fig. 2 — caliber and pattern of the action of the shaping forces on the bent shelves. In the manufacture of a bent box-shaped profile, the technological flanging is performed by successive shaping from a flat billet in rollers on the profile shelves, where the bending is affected by the profile elements during the shaping of the profile's bending points, providing the lateral compression and curvature of the latter. For example, in accordance with the proposed method, the manufacture of a box profile of 44x28x19x2 mm is 1; 3; is set on the rolls of the roll forming mill 2-6; i 50-500 with a forming speed of up to 3; v; .- ceii and the angle of the hem for the passage to At the same time, from the strip blank 2 X14 7 mm from steel 3 PS in the first four technological transitions, olfogl- is produced. technological flanging 1 .i; a hunt 135 relative to the flange profile. the method of simultaneous free bending and piping of the interlocking shelves 2 and side walls 3 (transitions IV-Viii). Upon reaching the shape of the profile that is close to x final (transition VII), its sections are flexibly and transversely compressed by the joint element. roll to bend points at flanging. For the high-quality forming of the bend points, the shaping forces R are applied to the shelves 2. In this case, the forces are transmitted from the side of the joint guide element through the flanges 1 to the bend points. The presence of the flanging 1 increases the contact area of the edges of the shelves 2 with the roll elements and allows you to increase the forces transmitted by the shelves 2 to the bending points for high-quality molding without the metal of the edges and loss of the stability of the shelf 2. At the same time, when molding by a known method, due to the lack of technological flanging at the closing shelves 2 in a number of cases under the influence of the rolls (force P occurs, the edges of the shelves and the loss of stability of the shelves 2 occur due to the small area of contact of the edges with the roller. b allows to produce profiles with a constant gap between the edges of the profile shelves, with minimum radii of curvature of the bend points on the finished profile (RS). At the same time, under the influence of the roll guide, the bending of the flanging of the shelf remains stable and no edges are observed. The method allows one to adopt a more rigid forming mode (angle of hemming per pass up to 45), which reduces the number of technological transitions by 10-15%. Claim 1, a method of manufacturing curved box-shaped profiles, including sequential shaping of transitions using transverse compression in rolls of a bending mill, characterized in that, in order to increase the quality of profiles by providing stable dimensions between the edges of the shelves, at the first transitions technological flanging is applied on the workpiece, then the bending of the shelves and walls is made flexible, and at the last transitions, when the shape of the profile is reached, which is close to the final, hem and transverse compression flanges, intermeshing roll to place the coupling flange and regiments. 2. Method according to claim 1 | characterized in that after fabrication of the profile, the flanging is removed. I transition I V ig Well d -, x-- 7 Jb and sh AI G7 / J /g./ FIG. 2