SU1488060A1 - Method of producing bent roll-formed sections with double-thickness edge elements - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular, to methods for the manufacture of curved profiles with double thickness elements on the edges of blanks with protective coatings, mainly feed dispensers. The aim of the invention is to improve the quality of the curved profiles by increasing the accuracy of the geometric dimensions of the elements of double thickness, maintaining the integrity of the coating on the outer surface of the places of bending and eliminating the longitudinal deflection. At first, bending of flanging up to angles of 160-170 ° is carried out successively in transitions. In preliminal transitions, bending of the flanging to 180 ° angles is carried out with their simultaneous compression by forces directed toward the points of bending. In the final transitions during the final molding of double-thickness elements, the curvilinear element is simultaneously compressed at a site with a girth angle of 180 to 240 °, the curvilinear element adjacent to it is stretched normally to the curvilinear flange surface, and the straight flange element is compressed by parallel to the surface of the original billet and directed toward the bending points. The shelves of the elements of the bent profiles are stretched axially. With significant sizes of the straight flanging element in the pre-finishing and finishing transitions, the outer surfaces of the flange and the straight flanging element are arranged in planes parallel to the original billet and equidistant from the axes of the rolls. The method eliminates cracks in places of bending. 1 hp ff, 5 ill.

Description

The invention relates to the processing of metals by pressure, in particular, to the manufacture of profiles, and can be used in the manufacture, for example, of troughs of feeders of cellular batteries for keeping poultry.

The purpose of the invention is to improve ka. combing the bent profiles by increasing the accuracy of the geometric dimensions of the double thickness elements and eliminating the longitudinal deflection, as well as maintaining the flatness of the coating on the outer surface of the bend points.

Figure 1 shows a double-thickness element on the edges of bent profiles; figure 2 - technological transitions

a method for producing profiles with double thickness elements; on fig.Z - forming the element of double thickness at bending angles close to 180, in the preliminary transitions; figure 4 - the same, in the final transitions; FIG. 3 is a diagram of the action of axial forces in the last finishing transitions.

The double-thickness element on creams of bent profiles consists of a straight section 1 of the shelf, a rounded section 2 with an inner radius

about

 on corner are flexible 180 ° + oL,

2

(where S is the thickness of the metal, g is the inner radius of the rounded section), straight section 3 with length C, radius section 4 with radius R g 2 to 5 times and angle oi. , straight section 5 flanging length b.

According to the method, in roughing transitions to bending angles of 160-170 °, a rounded section 2 is formed with a constant internal radius of bending and with a flange gradually decreasing in magnitude equal to the sum of the values of section 5 rectified by an arc of a radius section 4, straight section 3 and the unshaped part of the rounded section 2. Forming. Will be carried out in hard mode with corners. Podgibki each element by 45 ° in the second and third pairs of rolls II and III transitions. Then, in the IV transition, the side rollers make a bend at the angles of the flexible PO and the rolls of the fourth pair — up to 150 in the V transition. Then, in the sixth transition, a combination of side and mounted rollers is used to form up to bending angles of 160-170 ° with a constant value of f. shelves 1.

-

After that, in the VII transition at the predish molding at bending angles from 160-170 to 180, the intermediate flanging 6 is molded by bending horizontal rolls of the fifth pair with simultaneous compression. The flanging 6 by A, directed towards the bending points of the rounded section 2 arising from the introduction of active limiting elements into the working roll stream. This ensures the dimensional accuracy of double thickness elements on both sides of the main flange 1 in size b.

Q

15

20

25 jg

35 1

In the finishing VIII transition, by the efforts of the same fifth pair of rolls, continuing to compress the flanging 6 with forces A ,, parallel to the surface of the initial billet and directed towards the bend sites, the final molding of the double thickness element is carried out, while compressing the molded finally curvilinear section 7 of the rounded section 2 on the section are flexible from 180 to 240 forces P, stretching simultaneously formed with the radius section 4 of the opposite sign of curvature by forces Pj, while efforts And P, j are directed normal to the surface portions 4 and 7.

In order to prevent the longitudinal deflection during the final molding process, in the VIII junction, shelf 1 is stretched with application of axial forces due to the increment of the main diameters of the rolls 8 D in comparison with the main diameters D ;, of the previous pair of rolls 9. Herewith

Dj, D + 2-AD;

... DZ - DI

AD 2

where D is half the increment along the main roll diameters; DI - the main diameter of the rolls 9; D is the main diameter of the rolls 8.

40

45 jQ jj

The increment of diameters D provides the increment of linear velocities V + AV over the base diameter, causing stretching. In the process of deformation of the last transition in the finally formed profile of the element of double thickness, there are elastic spring-loaded forces rounded 2 and a radius of 4 sections. At the same time, the elastic deformation of the rounded section 2 creates a spring angle, which bends the rectilinear element 5 from the plane of the shelf 1. The elastic deformation of the radius section 4 forms the spring angle, which presses the element 5 to the shelf 1. However, due to the compression forces A of the flanging towards the curvature of the rounded the section in the pre-finishing transition and the compression forces P in section 7, the action of the elastic spring forces of the rounded section 2 is noticeably weakened, while the pressing force of the elastic spring of the radius section 4 obtained in

The last stage of molding is retained, which ensures a guaranteed clamping of straight sections 1 and 5 to a double-thickness element.

The action of compressive forces A in combination with radial Ps in a preliminary transition ensures the accuracy of the geometric dimensions of the element of double thickness and reduces the stresses on the top. the outer layer of the rounded surface, which contributes to maintaining the integrity of the coating, especially in the presence of protective decorative coatings.

With significant dimensions of the straight-line element 5, reaching up to 50% of the length of the shelf 1, the outer surfaces of the shelf and the straight-line element 5 in the pre-finishing and finishing transitions are arranged in planes parallel to the original billet and equidistant from the axes of the lower and upper rolls, which improves speed profiling mode and contributes to maintaining the integrity of the coating in places where curvilinear contour of sections 2 and 4 of double thickness is formed.

The method of manufacturing double thickness elements can be carried out using both a shaping tool and a punching tool, with pre finishing and finishing transitions with compression of flanging in the direction of bending and application of normal compression forces to the molded curvilinear contour in the final stage is carried out in one working move the press. (in one operation). When producing by stamping according to the proposed method, the straight shelves fit simultaneously, preserve the integrity of the coating, and ensure the accuracy of the geometric dimensions.

PRI me R. The profiling method is used to produce a profile from a strip with a cross section of 1X10 mm and a length of 1780 mm with P dimensions: b 2.25 mm; h 2.5; 1 6.25 mm; from 0.17 mm; g 0,5mm; R 1.5 mm. Galvanized steel is used as a material, pilot profiling is performed on a profile bending mill with a profiling speed of V 30 m / s.

The profiles produced according to the proposed method with elements of double thickness at the edges are characterized by the degree of width of the elements double

thickness, stability of geometrical dimensions, the absence of longitudinal deflection along the length, the absence of cracks in the places of bending, the integrity of the coating and the absence of non-adhesion of the straight elements of the element of double thickness.

The proposed method, in comparison with the known method, provides an improvement in the quality of curved profiles having elements of double thickness at the edges due to more accurate making of the geometrical dimensions of the element double. thickness. By better ensuring the integrity of the protective coating, the invention can be used for the manufacture of curved profiles with double thickness metal elements with protective decorative coatings.

Claims (2)

Invention Formula one A method of manufacturing curved profiles with double thickness elements on edges from blanks with zax coatings, mainly feed dispensers, consisting of adjoining straight line sections of flanges and flanging connected by adjacent curvilinear sections, while the rounded section adjacent to the shelf has an angle of coverage 180 - 240 and the inner radius of 0.5-1.0 profile thickness, and the area adjacent to the flare has a curvature of the opposite sign with respect to the rounded section and the inner radius exceeding 2 - 5 times the radius of this area, including a bending of the flange up to 160 - 170 ° angles along the transitions and its upset on the last transitions before contact with the shelf, O the fact that, in order to improve the quality of the bent profiles by increasing the accuracy of the geometric dimensions of the elements of double thickness, preserving the continuity of the coating on the outer surface of the places of bending and eliminating the longitudinal deflection, due to their compression, the forces perpendicular to the ends of flanging and directed towards the bending points, while in the finishing transitions during the final molding of double thickness elements simultaneously with the length of the pre-finishing transitions to the U-180 are carried out simultaneously with the ends of the grating , compress the curvilinear element in the area with the angle of coverage 180-240 and stretch the curvilinear element adjacent to it with the curvature of the opposite sign by forces directed normally to the curvilinear surface of flanging, and the regiment elements bent sections is stretched in the axial directions. 2. The method according to claim 1, characterized in that, when the dimensions of the straight flanging element are 50% of the shelf length, the outer surfaces of the flange and the straight flanging element in the pre-finishing and finishing transitions are arranged in planes parallel to the original the workpiece and equidistant from the axes of the lower and upper rolls. Ot, L Phie.1 Zhperekhv FIG. figm W transition FIG. five