SU778862A1 - Method of producing section with corrugations - Google Patents

Description

i. -. .

The invention relates to the processing of metals by pressure and is intended for use in the manufacture of X corrugated curved profiles of the jaquat with semicircular hoframes made from blanks 0.5–4.0 mm thick.

A known method of manufacturing curved profiles, according to which it is envisaged to produce profiles by a method of successive profiling of transitions to obtain a finished profile, and in order to improve the quality of profiles with curvilinear bending, my areas from the outside stretched in the transverse direction, are applied along the edges of the curved sections. The inner part of the profile is in contact with 20 rollers around the entire contour l. I The disadvantages of this method are that it is practically impossible to produce profiles of billet of different thickness with good surface quality and the same depth of the corrugations, moreover, in the places of contact of the roll with the metal on curvilinear sections, deep longitudinal risks or pressures are possible.

The magnitude of the thinning reaches in the order of 18–20% of the initial thickness of the hem. tovki. These drawbacks are due to the fact that in the horizontal plane the rolls are in contact with the workpiece both on the outer and on the inner surfaces, the gap between the surfaces of the upper and lower rolls is equal to the thickness of the metal, which prevents the corrugation top from bending freely. velocity differences in the places of contact of curvilinear sections can by. live risks or. push down

The purpose of the invention is to improve the quality of profiles, mainly from billets of different thicknesses.

The goal is achieved by the fact that in the first transitions profiles with trapezoidal corrugations are formed, the wall width of which is equal to the expanded width of the rounded top of the corrugation in finished form, after which the corrugation wall is reformed from the free flexible corrugation in the process of bending.

Claims (1)

FIG. 1 shows the trapezoidal shape of the first stand gauges for producing profiles with semicircular corrugations; in fig. 2 - form the calibers of the subsequent stands for obtaining profiles; in fig. 3 - sequential calibration of the rolls and the form of calibers for obtaining corrugated profiles according to the proposed method. According to the proposed method, in the process of profiling, it is advisable to form a profile with trapezoidal corrugations in the first passes, and then to bend the ribs, providing a deflection of the top. Corrugated profiles with semicircular corrugations are planned to be produced by the method of sequential molding of its elements. In the first cells, the corrugation has a trapezoidal shape, its top is flat, and the width is equal to the developed width of the semicircular tip of the corrugation. In the subsequent cages, the ribs of the corrugation are flexed, ensuring the apex deflection. With this method of forming, there is no contact between the top of the formable corrugation and the upper roller, which helps to reduce thinning, and the free deflection of the top of the corrugation allows profiling billets of different thickness, ensuring constant depth of the corrugations. . In order to obtain a trapezoidal corrugation and subsequent free deflection in the first forming adhesive, the corrugation of the elements of the corrugation is made at an angle oL by the lower and upper rollers having a trapezoidal shape. The width of the base of the gauges across the cages is determined in such a way that in the last forming cage when Ke is bent at an angle d. the width of the caliber base was equal to the finite width of the base of the corrugation. At the same time, in each cage along the lower roll, an exemption was made for the value of C. Thus. Bk b,. DHK to a; C C. R. Radiuses of roundings R obtained in previous cells x. . After the corrugation leaves the cage, each edge of the corrugation in the final forming cage is bent in; - th1 |, greater than the angle th (... MeiiisiieTCH corrugation base metal in the direction of least resistance, i.e. towards the released part of the lower roll and occupying a fit corresponding to R. Thus, the thickness variation of the workpiece, its mechanical properties, etc. do not affect the final shape of the corrugation and its height .. The choice of free deflection of the top of the corrugation is due to the fact that if it is not observed, it is clamped. | Goymezhduzhu It is practically impossible to obtain profiles from billets of various thickness, since the caliber can be used to set a billet of only a certain thickness .. The proposed method can be implemented using a device containing a set of rolls for Sheet metal profiling. For example, to obtain a corrugated profile 870 22, О mm with semicircular corrugations of stainless steel 12X13G18D, a sequential method is adopted. forming with the mode of bending of the elements of the corrugations 0-10®-20 -30 ° -40 ° -53. In the first passes with a bend angle of up to 20, trapezoidal corrugations are profiled, and then in cages with bending angles of 30 -4СР-БЗ the peaks are deflected, while the width c of the corrugations in the first passes is equal to the unfolded width of the corrugation tops in the other forming cells . When podgibka ribs corrugation at an angle of 10 trapezoidal upper and upper rollers height H - b mm. Studies have shown that in the manufacture of corrugated profiles, the magnitude of the local deflection resulting from the presence of residual stresses and springings of straight areas C 1.0 N. Consequently, from 0.1 N to 0.1-6 0.6 mm. The diameter of the lower roll (without release) D where I - gear ratio .. Taking into account the release diameter of the bottom. the roll 1 of the forming stand of it is OH, - s, - D51 - 0.1 N ,. The radius of the corrugation R, the value of a and b is calculated by the formulas. The rest of the cages are calculated in the same way. At the same time, in the stand K, finishing the forming of the corrugation, the values of a, b, R, d, H correspond to the final value of the corrugation. As shown by the data of experimental verification, the proposed method can be In the same set of rolls to obtain profiles with a thickness of 0.5-4.0 mm with a thickness difference of 1-2 mm, while the known methods need two sets. The relative thinning in the places of bending decreases by 20% (it was at a thickness of 2 mm 0.5 mm, it became 0.4 mm), the height and radii of the corrugations of the corrugations are the same across the entire section of the profile, hence the proposed technical solution contributes to the quality of the profiles. The invention The method of producing profiles with corrugations having rounded tops, is made in the molding of elements by transitions in the rolls of the profile-cutting machine, in order to improve the quality of the profiles, mainly from the different blanks, in the first transitions form a profile with trapezoid corrugations whose wall width is equal to the unfolded width