SU1639829A2 - Method of making corrugated sections - Google Patents

Abstract

The invention relates to the processing of metals by pressure and is intended for use in the manufacture of curved rolled sections, mainly with a trapezoidal form of corrugation, in rolls of a bending mill. The purpose of the invention is to improve the quality of the profiles by reducing their longitudinal transverse deflection and helical twisting. Initially, an intermediate corrugated profile is formed from a blank with angular-shaped corrugations symmetrically located with respect to the flat portion of the blank corresponding to the vertical wall of the future medium corrugation and equal to the width of the horizontal wall of the finished profile. Then, by successively bending in mutually opposite directions of the sections of the shelves of the corner corrugations, the side and horizontal walls are shifted, shaping them to the given geometrical dimensions. In this case, the displacement is carried out symmetrically with respect to the flat area, ensuring the balancing of the bending moments of the forming forces. 2 ill., 1 tab. H

Description

The invention relates to the processing of metals by pressure, is intended for use in the manufacture of curved rolled sections, mainly with a trapezoidal shape of a corrugation, in rolls of a bending mill, and is an improvement of the invention according to the authors. No. 1344457.

The purpose of the invention is to reduce the longitudinal and transverse deflection and helical twisting of the profile.

FIG. Figure 1 shows a corrugated profile forming circuit; Fig. 2 is a diagram of the application of bending moments for reshaping corner corner corrugations.

In the manufacture of galvanized steel billet profile flooring coatings with trapezoidal corrugations initially from the original billet 1 in junctions II-VI form an intermediate corrugated profile with corner corrugations with shelves 2 and 3, symmetrically located relative to the flat portion of the billet 4, corresponding to the horizontal wall of the future medium corrugation and equal to the width of the horizontal wall E of the finished profile 5. The flat section 4 in all transitions is located at the level of molding X-X, which contributes to stabilization and forming a profile and the possibility of applying a more rigid mode. In this case, the width A and B of the shelves 2 and 3 of the corner corrugations is equal to the total width (A C + D) and (B C + E) of the side 6 and horizon.

WITH

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tal 7 and 8 walls of the finished profile 5, respectively. The corner corrugations, symmetrically located with respect to the flat section 4, are formed until the distance F between the vertices of the corners 9 and 10 of the bend, defined by the distance between the identical bend sites on the finished profile 5, is reached, then in subsequent technological transitions VII-XII by successively bending mutually opposite directions of the sections of the shelves 2 and 3 of the corner corrugations displace the side 6 and horizontal 7 and 8 walls (the direction of displacement is shown by arrows), shaping them to the given geometric dimensions ditch In the process of this conversion, the angle / hem of the side wall b adjacent to the flat section 4 and the adjacent corrugation is increased to its specified value. - 66 °, and the angle of the hem at horizontal wall 8 is reduced to 0 °. The nature of these displacements of the corrugation elements is characterized by symmetry with respect to the flat section 4. In the process of forming the H-57-750-0.8 profile, the direction of displacement of the elements of the corrugation symmetric with respect to the flat section 4 allows the application of multidirectional bending moments Mg, as a result of which corrugations of a given shape are achieved by balancing these bending

moments of Mg 0 and, therefore, the power factors of the profile twist are excluded.

 The proposed method can be implemented when forming profiles in the rolls of a roll forming mill and does not require special devices for its implementation. On the profile bending mill 0.5 ... 1.5x500 ... 1500 galvanized billets are made of a corrugated profile H57-750-0.7 with trapezoid corrugations 57 mm high in a continuous way according to the regime given in the table. At the same time, the section of the blank corresponding to the horizontal wall of the middle corrugation is kept at the level of molding in all transitions, and the intermediate corner and finally formed corrugations are arranged symmetrically with respect to the middle section of the blank.

To obtain the finished profile by the proposed method, 13 technological transitions are required. Workpiece width

1250 mm. For manufactured profiles, dimensions are provided with a deviation: ± 1 mm in height, ± 5 mm in width, which is within the requirements of GOST. Waviness

on flat sections, the profile does not exceed 1.0 mm per 1 m of the profile length. No helical twisting of the longitudinal and transverse deflection of the profile and the disturbance of the zinc coating is not observed.

According to the calculated data and experimental testing on the mill 0.5 ... 1.5x500 ... 1500 mm, the proposed method of producing corrugated profiles in comparison with the known one has the following advantages:

Improves the quality of profiles by increasing the accuracy of geometrical dimensions by reducing the transverse deflection, which is not observed on finished profiles x, there is no helical twisting of profiles during their forming and on finished profiles x, and the longitudinal deflection does not exceed 0.5 mm per 1 m length while in similar profiles made by the famous

method, the longitudinal deflection exceeds 1.5 mm per 1 m length of the profile, there is a transverse deflection-arrow of the deflection exceeds 1.5 mm, the helical twisting per 1 m of the length of the profile reaches 0.5 g; the number of technological transitions decreases by 7-10% by providing the possibility of using rigid modes (making the profile H57-750xO, 7 with trapezoid corrugations by the proposed method

carried out in 13 cages of a roll forming mill 0.5 ... 1.5 x 500 ... 1500 mm, and for making such profiles in a known manner, no more than 14 working stands are necessary).

Claims (1)

Claims of Invention. Method of producing corrugated profiles according to ed. No. 1344457, characterized in that, in order to reduce 5 longitudinal transverse deflection and helical twisting of profiles, corner corrugations form symmetrically with respect to a flat portion of the workpiece placed in all transitions at the level 0 molding and the corresponding horizontal wall of the future medium corrugation, and in the process of shaping the corrugations ensure the balancing of the bending moments applied to the profile of the forming 5 forces by symmetric application of a relatively flat portion of multidirectional moments. Table continuation I transitions ME AND