NL8402051A - Profiled steel roofing plate - uses rolling mill stand providing trapezium shaped profile with longitudinal and transverse reinforcing ribs - Google Patents

Abstract

The roofing plates for a large span building have a trapezium shaped cross-section, and are mfd. in a sheet steel providing longitudinal trough shaped grooves and transverse reinforcing ribs. The trapezium profile (3) has two reinforcing ribs (4) in the horizontal part (5) and profiled flanges (6,7) which serve to nest in an adjoining identical section. The sections have longitudinal reinforcing parts and upstanding flanges (15,16) at an obtuse angle. Transverse reinforcing ribs (14-18) may have a width of (2-3 cm) and a depth of (0.8 cm).

Description

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Method and device for the production of profiled steel roof plates with longitudinal and transverse stiffeners, as well as trapezoidal profiles with longitudinal and transverse stiffeners.

05 The invention relates to a method for manufacturing recessed profiled steel roofing sheets, in particular roofing sheets in the form of trapezoidal designs, for use for large building spans, which are provided with longitudinal stiffeners in the webs and with a large a number of short transverse stiffeners, spaced at a small mutual distance, in the form of protrusions pressed from the profile surface, which extend in the deepest profile part and over the full length of the profile.

The invention furthermore relates to a device for carrying out the method as well as to a trapezoidal profile which is manufactured according to the new method.

A trapezoidal roof profile is known which is suitable for fairly large spans, e.g. of 7.5-10 m. Using longitudinal stiffeners, such a trapezoidal roof profile is used, but only in the horizontal part is provided with transverse stiffeners extending over the full profile length. The other body parts are flat, apart from longitudinal stiffeners arranged therein. A known trapezoidal profile is reinforced or strengthened at a support point by separate plate-shaped support elements. supported. In principle it is not the intention that the new trapezoidal profiles according to the invention are additionally supported at the location of its support by loose support elements deviating in the form of the trapezoidal profiles.

There are limits to the allowable strength criteria with increasing profile height - desirable with larger spans - otherwise creasing will occur and the trapezoidal profiles will collapse as a result. Although it is also possible to imagine transverse stiffeners in the upright body parts of the trapezoid profiles, this poses major problems in terms of manufacturing technology. After all, one has to do with the provision of protuberances in initially flat sheet material, which means that the dimensions of the sheet in length and in the transverse direction change considerably, and also depending on the thickness of the sheet material to be deformed for the profile is used. Not only does one have to do with pleat- & ** u i l; V> S '% -2- 36440 at the failure load of the trapezoidal profile, but wrinkling also occurs at the deformation stages and must of course be eliminated as much as possible in order to obtain a dimensionally stable and dimensionally stable product.

0 5 There are few problems with a mold when pressing or stamping profiles with protrusions in one working stroke. Otherwise, when using a rolling method as in one continuous operation, both longitudinal and transverse stiffeners must be applied.

If, for reasons of manufacturing engineering, use is now made of profiling with the aid of a profile rolling machine, the above-mentioned problems can be completely avoided if, according to the invention, a trapezoidal profile provided with longitudinal and transverse stiffeners is profiled using a profile rolling machine in which The successive machining stages are: a. A greater number of longitudinal stiffeners are rolled in a flat sheet than ultimately remains in the finished trapezoidal profile; b. by means of a ribbed roller resp. butt roll is rolled in each profile plane, namely, bottom and side walls, transverse stiffeners under the simultaneous and almost complete backlashing of at least one longitudinal stiffener which is located on or near the end of a transverse stiffener in a profile plane; c. the plate thus provided with longitudinal and transverse stiffeners is brought into the ultimately desired trapezoidal profile shape in the usual manner by means of profile rollers.

It is also possible to change the processing order according to the invention so that the processing is as follows: aa. a greater number of longitudinal stiffeners is rolled in a flat plate than ultimately remains in the finished trapezoidal profile; bb. the plate provided with longitudinal and transverse stiffeners is brought into the desired trapezoidal profile shape; cc. by means of one or more corrugated rollers resp. compression rollers are rolled in each profile plane, namely, bottom and side walls, transverse stiffeners, while simultaneously and almost completely back-firing at least one longitudinal stiffener which is located on or near the end of a transverse stiffener in a profile plane.

8402051 -3- • 40 It is noteworthy that the insight to carry out the machining in this way has led to concrete results in the machining stage a resp. aa total of 10 longitudinal stiffeners of different deformation Q5 degree are applied, of which at least two with the highest deformation degree remain in the finished trapezoidal profile, while at least 6 in a later machining stage are practically pushed back into the profile plane by means of a swaging roller. In another editing; at least two longitudinal stiffeners which are 1Q on or near the flanges of the trapezoidal profile can also be pushed back.

The almost complete or complete backstitching of a number of longitudinal stiffeners does not affect the appearance of the trapezoidal profile, but does have the advantage that the controllability of the profiling method is no longer problematic, while moreover an additional increase in the flexural strength by backstriking occurs.

The method according to the invention can be carried out very well with a profile rolling machine to which according to the invention substantially three roller-2q rolling sections are added, n.1.

- an additional profile roller section for longitudinal stiffeners to be recut at a later machining stage; - a corrugated roller section for the application of transverse stiffeners in all profile surfaces and - a compression roller section for almost completely pushing back those along stiffeners which do not remain in the finished trapezoidal profile.

According to the invention, the arrangement of the wafer roll sections can be carried out in such a way that a profile rolling machine in the direction of flow of the profile is provided with: - one or more profile rollers for arranging a number of longitudinal stiffeners in a flat plate; - one or more ribbed-rollers for applying transverse stiffeners in the profile surfaces and one or more butt-rollers for back-firing a predetermined number of previously applied longitudinal stiffeners that do not remain in the finished trapezoidal profile. A favorable embodiment arises if according to the invention the corrugated roller and the compression roller are combined into a combined corrugation / S i 0 2nst

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-4- 36440 butt roller.

It has further been found that the longitudinal stiffeners remaining in the trapezoidal profile contribute significantly to the control of the flat sheet strip 0 5 in the device. When importing, the cross shortening in the first deformation phase must therefore be prevented from being too great. A gradual increase in deformation is preferable and prevents annoying curves; of the material strip.

In the trapezoidal profile obtained according to the invention, the longitudinal stiffeners are now located: both in the bottom and in the upright side walls of the profile and continue through the profile length, each time forming the boundary of a large number of transverse stiffeners, which are located in profile sections which mutually enclose an angle, in particular an obtuse angle.

15

The invention will be elucidated hereinafter with the aid of the drawing, with reference to an exemplary embodiment of a device with an associated profile rolling machine according to the invention for applying the method.

Fig. 1 shows a schematic arrangement of the device with a profile rolling machine;

Fig. 2 shows a finished trapezoidal roof profile in cross section;

Fig. 3 shows a perspective view of a trapezoidal roof profile, 25 of which is a cross section in FIG. 2 is drawn and

Fig. 4 is a schematic overview of the different stages of profile rolling molds into which the flat sheet is placed when passing through the profile rolling machine according to the invention.

The device 1 according to the invention, schematically shown in FIG. 1, includes a profile rolling machine 2 for roll-forming a trapezoidal roof profile 3. This profile 3, symmetrical with respect to a vertical central surface, is substantially trapezoidal, provided with two profiled longitudinal stiffeners 4 in the hay-like part 5 and also with profiled flanges 35 6 and 7 which serve to promote nesting of the flanges 6, 7 in parallel positioning of two adjacent roof profiles 3 next to each other.

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In this profile 3 there are further profiled longitudinal stiffeners 8, 9, 10, 11 near the flanges 6, 7 and profiled longitudinal stiffeners 12, 13 in the horizontal profile part 5. In a direction transverse to the longitudinal direction of the profile 3, both in the horizontal profile part 5 as profiled transverse stiffeners 14, 17, 18 in each of the upright 05 side walls 15 and 16.

Such transverse stiffeners 14, 17, 18 can be elongated, have a width of 2-3 cm at a depth of 0.8 cm. The profile 3 then has e.g. A total height of 20.8 cm, a bottom width of 42.5 cm and, with a flange width of approx. 5 cm, a maximum width center to center. from left to right flange in fig. 2 of approx. 60 cm.

In the profile 3 in fig. 2 and 3, however, in the end only the profiled longitudinal stiffeners 8-11, 12 and 13 are left behind because during the rolling operation these profiled longitudinal stiffeners are almost completely or completely pushed back into the rolled sheet material. In FIG. 4, various processing stages from the flat plate 19 to the shape of the end profile 3 are schematically shown. In the machining stages I, II, 'and III, longitudinal stiffeners 12, 13 and 12 are applied with the aid of the profile rollers 24, 25 and 26 in the sheet material drawn from an unwinding roller. 20, 21, 22 and 23. ZQ also induces a deepening 29 of the material in stage III, while the profiling of the longitudinal stiffeners 12, 13, 20-23 from stage I to stage III increases in stages. This phased increase in the degree of deformation also aims to facilitate transport by preventing excessive creasing.

25

The device 1 further comprises a combined corrugated roller / butt roll roller pair 27, 28, and to this is added the profile rolling machine 2 consisting of a number of profile roller rolls 30 to 43, followed by a shearing shear 44 and subsequently a supporting table 45 with rollers 46 for the finished profile 50 3.

From fig. 4 it appears that of the previously profiled longitudinal stiffeners 12, 13, 20-23, a certain number disappeared simultaneously after passing the corrugated roller / butt roller 27, 28, ie during the passage of the corrugated / butted roller 27, 28 the transverse stiffeners 20-23 are pushed back fully or almost completely back into the material. By using this method, previously undesired shape changes are caused by the 8402051

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36440 '6' longitudinal profiling of the material, which is unavoidable in roll forming, is compensated in such a way that any undesired creasing or any undesired deviation from the required profile axis is omitted, which ultimately results in a clean profile 3.

05

The insight underlying the invention makes it possible to produce a trapezoidal roof profile with an exceptionally high bending stiffness at an optimum height in a single operation, without requiring any further finishing, without being limited by the permissible height due to the presence of longitudinal stiffeners which are only located in the horizontal profile part 5, as a result of which a lower bending stiffness is obtained than with the profile 3 according to the invention, in which the presence of additional transverse stiffeners 17 and 18 contributes to the stability of the roof profile 3 influence favorably. The advantages obtained make it possible to have roof profiles that have a lower own weight with a greater span and with greater stability than has hitherto been attainable.

A corrugated roller of the type useful for the process has previously been used for rolling protuberances into sheet metal for plate radiators. used for heating. This processing method has not been used for years. According to the invention, three such corrugated rollers are used on the same shaft and the compression roller is then each time at the end of a transverse stiffening 14, 17, 18. A further explanation 25 thereof seems unnecessary here. In FIG. 1, one or more stretching rollers 47 may be located between the corrugated roller / compression rolling section 27, 28 and the profile rolling machine 2. Between the unwinding roller 48 and the infeed side of the profile rolling roller section 24 there are percussion shears 49 and a sensor 50, the latter of which is passed through the degree of sagging of the material strip 51 is actuated, which operates the motor for unwinding. In the profile rolling machine 2, in various deformation steps, among other things, longitudinal stiffeners are provided in the flanges 6,7 of the profile 3. If desired, the flanges 6, 7 can also be provided with pre-centered protuberances to facilitate on-site drilling of mounting holes for bolts and the like. For this purpose, a centering punch roll (not shown) can be added to the profile rolling machine 2.

8402051

Claims (10)

9- "5? W, n CONCLUSIONS 36440 1. Method for manufacturing recessed profiled steel roofing sheets, in particular roofing sheets in the form of trapezoidal profiles, for use in large building spans, which are provided with longitudinal stiffeners in the webs and a large number of them at a small mutual distance 05 spaced short transverse stiffeners, in the form of protrusions pressed flat from the profile, which extend in the deepest profile part and over the full length of the profile, characterized in that in the two upright body parts of the profile during the same operation if, in which the short transverse stiffeners are fitted in the deepest profile section, a large number of transverse stiffeners is also arranged at a small mutual distance, formed by protuberances pressed out of the respective profiled surface, all this in such a way that the transverse stiffeners in each case substantially in profile areas which enclose an angle with each other, in particular an obtuse angle. 15 Method according to claim 1, characterized in that a trapezoidal profile is profiled together with longitudinal and transverse stiffeners using a profiling machine in which the processing stages are successively: 20 a. In a flat sheet a greater number of longitudinal stiffeners are rolled than finally remains in the finished trapezoidal profile; b. by means of a ribbed roller resp. the butt roll is rolled in each profile plane, namely, bottom and side walls, transverse stiffeners, while at the same time and almost completely back-firing at least one longitudinal stiffener which is located on or near the end of a transverse stiffener in a profile plane; c. the plate thus provided with longitudinal and transverse stiffeners is brought into the ultimately desired trapezoidal profile shape in the usual manner with the aid of profile roller strips. Method according to claim 1, characterized in that a trapezoidal profile is profiled together with longitudinal and transverse stiffeners using a profiling machine in which successively the processing stages are: aa. in a flat sheet a greater number of longitudinal stiffeners are rolled 55 than ultimately remain in the finished trapezoidal profile; bb. the plate provided with longitudinal and transverse stiffeners is brought into the desired trapezoidal profile shape; 8402051 36440 'cc. by means of one or more corrugated rollers resp. compression rollers are rolled in each profile plane, i.e. bottom and side walls, transverse stiffeners, while simultaneously and almost completely back-firing at least one longitudinal stiffener which is located on or near the end of a transverse stiffener 05 in a profile plane. Method according to any one of claims 2-3, characterized in that in the processing stage a resp. aa total of 10 longitudinal stiffeners of different deformation degree are applied, of which at least two with the highest deformation degree remain in the finished trapezoidal profile, while at least six in a later machining stage are almost completely pushed back into the profile plane by means of a swaging roller. 5. Method according to claim 4, characterized in that at least two more longitudinal stiffeners which are located on or near the flanges of the trapezoidal profile are almost completely swaged back. 6. Device for applying the method as claimed in any of the foregoing claims 1-5, characterized in that, to a profile rolling machine for manufacturing a trapezoidal profile, in which a number of longitudinal stiffeners are located, substantially three roller roll sections are added, n .1. - an additional profile roller section for longitudinal stiffeners to be recut at a later machining stage; - a corrugated roller section for the application of transverse stiffeners in all profile surfaces and - a swage roller section for almost completely pushing back those longitudinal stiffeners which do not remain in the finished trapezoidal profile. 7. Device as claimed in claim 6, characterized in that a profile rolling machine 30 in the direction of passage of the profile is provided with: one or more profile rolling rolls for arranging a number of longitudinal stiffeners in a flat plate; - one or more corrugated rollers for applying transverse stiffeners in the profile surfaces and - one or more butt rollers for recessing a predetermined number of previously applied longitudinal stiffeners that do not remain in the finished trapezoidal profile. 8 ~ 0 ~ 40 ~ 3 ~ 8 Device according to claim 7, characterized in that rifable roll and ram roll are combined into a combined corrugated / ram roll. Device according to claim 6, characterized in that the profiled rollers 05 for applying the longitudinal stiffeners are designed such that the longitudinal stiffeners are applied in at least two deformation phases, n.1. - in a first phase the two permanent longitudinal stiffeners are formed which are located in the bottom of the finished profile and 10 - then in a second phase the other longitudinal stiffeners are formed, whereby the deformation degree of the permanent and of the longitudinal stiffeners of the the first to the second and any subsequent phase may increase even further. 10. Profiled roofing sheet, in particular a steel trapezoidal profile for use for large spans, manufactured using the method according to any one of the preceding claims 1 - 5, characterized in that both the bottom and the upright side walls extend continuously longitudinal stiffeners, each of which forms the boundary of a large number of transverse stiffeners, which are located in profile surfaces which mutually enclose an angle, in particular an obtuse angle. 25 50 8 4 ö c, 0. 55