DE2118517A1 - Process for the production of curved corrugated rolled profiles - Google Patents

Description

Ul: rai: ir -ii --iicno-ir- ^ lfidovatel ¹ ski] infrtitut raetallov

PROCESS FOR MANUFACTURING CURVED SHAFT *

ROLLED PIPES

The present invention relates to the pressure treatment of metals an ^d particularly, to methods for the manufacture of corrugated curved profiles.

There are methods of manufacturing bent corrugated profiles from metal strips by successive Indern their shape and shapes of waves with clamped profile sections adjoining them known (see Soviet- " see patent application no. P.1914302.3 dated 20 · III.69, which in the BED).

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Changes during the manufacturing process of the profile its thickness is uneven in the cross-section of the waves formed at the same time and with a relatively large wave depth As a result of the local thinning it even happens that the profile metal cracks. Be at the same time those adjoining the maximally deformed profile sections / i Sections are only slightly deformed and have practically unused plasticity reserves

Corrugated profiles made of steels of increased strength with low plastic properties can according to the known Process cannot be produced, since the profile here as a result of large local deformations in the transverse direction rips.

Sometimes, especially in the manufacture of profiles Made of high-strength steels with a large number of shafts, the forces in the rolls are so great that the work rolls are turned deflect and thereby the dimensions of the profile elements in Height direction does not correspond to the required (calculated) dimensions. In this case, the profiling is done in several Operations (in several rolling stands of the rolling train) carried out. By shaping in several work steps the production costs for the rollers increased, the quality of the product decreased and the production costs of the same elevated·

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It is the aim of the present invention to do the mentioned Eliminate disadvantages.

The invention has the object of providing a method for producing curved corrugated profiles using executed before the waveforms preparatory operations to develop that allow ^v, to simplify the construction of the tool (of the rolls) to increase the quality of the profiles and their To reduce production costs λ

This object is achieved in that when producing curved corrugated profiles from metal strips by successively changing their shape and shapes of waves with clamped profile sections adjoining them

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ten, ^v according to the invention, prior to the shaping of the corrugations, the roll jogging section to be corrugated is stretched in the transverse direction by bending it in such a way that the circumferential length of the elongated section in the cross-sectional plane of the profile is almost equal to the circumferential length of the finally obtained corrugated profile section *

Appropriately, when producing complicated profiles with bent elements at the same time after stretching the corrugated section, these elements were bent over. The essence of the proposed invention consists in following.

In the case of »previous stretches in the transverse direction, where

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the straight profile portion receives ^v curvilinear shape, it is possible to metal at the locations with limited Metal] autritt in the waveform ^; (to the central shafts in the presence of adjacent shafts and to the shafts which are located before the bending points are near _{) e} Therefore the degree of local thinning of the strip is reduced and at the same time the risk of breakage for it is considerable The profile is reduced, which is particularly important when manufacturing profiles from less plastic steels of increased strength with a large corrugation depth.

The reduction of the degree of thinning with the result that the strength and plasticity characteristics of I ¹ POfIIe be increased, which means that their quality is better, "are when the previous stretching in the transverse direction of intended for skins profile section which is low for wave formation forces required and, consequently, the energy required to carry out the technological operations is reduced and the service life of the rollers is extended, which in turn reduces production costs «

Jiaclist is provided for a better understanding of the invention a specific implementation example of the method for producing channel steel with a corrugated web with reference to accompanying drawings described; Fig * 1 shows the schematic structure of the profile bending roll

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road for performing the inventive method, Fig. 2 is a section along line II-II of Fig. 1, Fig. 3 is a section along line III-III of Fig. 1,

4 shows a section along line IV-IV of FIGS. 1 and

Fig. 5 variants of the shape, which the blank section before the waves is issued. j |

The method of the invention is as follows carried out. A metal strip 1 (Fig. 1), which is used to manufacture of corrugated channel steel is intended to be turned into rotating Rollers 2 of the profile bending rolling mill, which has several pairs of rollers 2, 3 »4 and 5, are inserted.

The caliber of the rollers 3ι 4 and 5 are designed so that the strip 1 is given the shape of a U ~ steel with a corrugated web at the passage.

During the profiling process between the rollers 3 g (Fig. 2), the section 6 of the strip 1 intended to form the corrugated U-steel web is stretched in the transverse direction

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The section 6 ^Y between the rollers 3 ^v equally

ge undulating shape, and -was such that »a circumferential length almost equal to the Uafangslength of the corrugated Ü-Stahlstegs is, the section 6 is clamped at Adjacent sections 7 stretched and on the same side the bending of the belts 8 of the channel steel is started

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In the next pair of rollers 4 (Fig. 3) shafts 9 are formed on the i: ^ i iitR stretched U-steel web with clamped adjacent elements 7 and with simultaneous bending of the girders β.
Bend the Gurta ö until finished U-steel 10 (Fig. 4) is obtained.

It can be used to distribute the energy expenditure evenly on the rollers and to ensure optimum energy, force and speed savings in the technological process, stretching the U-steel web and shaping the waves not; only in the first and second roller pair, but also take place in any subsequent roller pairs,

Di-3 shape loe section that stretched before shaping the waves; ".vird, as can be seen from FIG. 5, can consist of a half-wave, wave, sinusoidal and others
Curves as well as a broken line

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Claims (1)

dol / - *. "7 - FATENTANSPEUGHi Method of making curved corrugated wali. ~ I.rofilen from I.metallic strips by ßufeinaiidfcrfolisendöß change: ν- Toi'm and forms of Y / elleji at feE ^ golclejinutan adjoining profile sections _t d 0 ό η rch ge ~ Ic ennze rejects that the ^ u undulating Eolilii3.rsab- i cut (6) before forming the waves (3) forward; ·: · ■:.%. _; The circumferential length of the elongated hollow ring section is stretched in the transverse direction by bending in this way ;: equals the circumferential length of the finally obtained corrugated profile section. 109850/1