RU2088355C1 - Method of making bent corrugated sections - Google Patents

Method of making bent corrugated sections Download PDF

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Publication number
RU2088355C1
RU2088355C1 SU5041245A RU2088355C1 RU 2088355 C1 RU2088355 C1 RU 2088355C1 SU 5041245 A SU5041245 A SU 5041245A RU 2088355 C1 RU2088355 C1 RU 2088355C1
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Russia
Prior art keywords
corrugations
along
profiles
profile
blank
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Russian (ru)
Inventor
Евгений Николаевич Чебурахин
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Евгений Николаевич Чебурахин
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Priority to SU5041245 priority Critical patent/RU2088355C1/en
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Publication of RU2088355C1 publication Critical patent/RU2088355C1/en

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Abstract

FIELD: plastic metal working, namely production of bent corrugated sections. SUBSTANCE: method comprises steps of preliminarily bending sheet blank along arc of circle, then simultaneously along the whole cross section forming corrugations by bending and smoothly lowering curvature of blank. Corrugation is realized by two stages. At first stage corrugations with rounded apices are made by pushing blank through non-driven rollers arranged along arc-shaped guides. At second stage members of section are subjected to upsetting for receiving their necessary configuration. EFFECT: enlarged manufacturing possibilities of method, enhanced quality of sections due to their rectilinearity and dimension stability. 2 dwg

Description

 The invention relates to the processing of metals by pressure and is intended for use in the manufacture of bent corrugated profiles.
 There is a method of manufacturing corrugated profiles in rolls of a roll forming mill, in which an intermediate wavy blank is first formed from sheet or roll material simultaneously over the entire cross-section in the profiling plane, and then the profile elements are upset to the desired configuration (Production of bent profiles. Equipment and technology. Under Edited by I.S. Trishevsky, M. Metallurgy, 1982, p. 262-276).
 The disadvantage of this method is the low quality and the inability to manufacture multi-profile (more than six-profile) profiles for a small number of transitions; a satisfactory profile can be obtained only with a small (3-4) number of edges or waves and narrow extreme straight sections with a ratio of the width of the straight section to the thickness of the material not more than 12.
 The limited application of this method for manufacturing a small number of transitions of multi-profile profiles, including those with wide extreme straight sections, is determined by the specific features of the process of forming an intermediate corrugated workpiece.
 Firstly, in the transverse direction in the axial plane of the rolls, provided that the sheet is continuous, large tensile deformations occur, which often reach the headings in the central part of the ultimate strength of the material and its destruction.
 Secondly, large displacements of the edges of the headers in the axial plane of the rolls to its longitudinal axis lead to the reshaping of the extreme corrugations, especially when entering the next gauge, which significantly impairs the quality of both individual elements and the entire profile. The “buckling” of the central part of the preform observed in this case, especially before entering the first gauge, makes the molding process unstable, promotes the formation of a transverse wave by bending and often destroying the material.
The closest in technical essence is a method of manufacturing bent corrugated profiles, in which the sheet billet is pre-bent in an arc, after which corrugations are molded simultaneously flexible along the entire cross section with a gradual decrease in the resulting billet curvature (groups of corrugations or waves of smaller sizes are molded from one large wave equal projection width of the metal being formed onto the horizontal axis or plane in all sedimentary stands) [Trishevsky I.S. Klepanda V.V. Khizhnyakov Y.V. Cold-formed corrugated rolled profiles. Kiev: "Technique", 1973, p. 154-156]
The elimination of the extreme rearrangement due to shaping along arcs of decreasing curvature at a constant projection width onto the horizontal plane does not solve the problem of large transverse tensile deformations in the axial plane of the rolls, especially the first transition, in the manufacture of multi-profile profiles for a small number of transitions. The decrease in the quality of the profiles is also caused by the mismatch of the linear velocity of the profiled workpiece with the peripheral speeds of the drive rolls of the first transitions, especially with a large curvature of the working gauge gap. This leads to slippage of the profiled metal on the surface of the rolls and the appearance of scoring and scratches on the surface of the profiles, as well as to increased wear of the rolls. In addition, when forming a wavy heading of large transverse curvature due to the uneven distribution and the coexisting difference in circumferential speeds of the upper and lower rolls of close gauge, various longitudinal deflections of the elements of the entry part of the profile (central and side) arise and there are significant difficulties when entering the workpiece in the following gauges, which negatively affects the quality of the profile in its lead-in, especially when piece forming. And finally, the manufacture of profiles with a constant projection width on a horizontal plane requires the manufacture of a complete set of forming rolls for each profile size, and the conditional radius of the arcs of the first transitions is “individual”.
 The aim of the invention is to expand the technological capabilities of the method of manufacturing corrugated profiles and improve their quality by weakening the molding mode.
 The goal can be achieved by the fact that for the manufacture of bent corrugated profiles by a method in which the sheet head is preliminarily bent in an arc, after which it is flexible simultaneously over the entire cross section of the corrugation with a gradual decrease in the resulting workpiece, the corrugations are formed in two stages, the first of which is formed corrugations with rounded tops pushing the workpiece through non-drive rollers located along the guide arcs, and on the second they carry out the draft elements to the desired configuration tion.
 A comparative analysis of this solution with the prototype shows that this method differs from the known one in that the corrugations with rounded peaks are molded by pushing a sheet stock bent along the arc by the drive rollers of the first transition through non-drive rollers located along the guide arcs.
 Obtaining a corrugated workpiece by a known method involves a hard mode of simultaneous molding due to transverse drawing, i.e. large tensile strains.
 In the inventive method for manufacturing corrugated profiles, including multi-profile ones, the weakening of the molding mode, especially when the strip enters the forming transition, is achieved by affecting the deformation zone from the drive rollers of the first transition of uniformly distributed axial forces, the values of which are higher, the deeper the molded in this junction of corrugations. In this method, the formation of wavy blanks is carried out with one combination of conditional arcs of transitions of optimal value, providing sufficient longitudinal stiffness of a sheet or roll material bent along an arc in the first transition, as well as a wavy blank with transverse curvature. It also allows the drive rollers of the first transition to enter the workpiece into the non-drive rollers of the next transitions, placed along the guide arcs of correspondingly decreasing curvature and having the option of reconfiguring the wavy header to other sections, which significantly reduces the cost of manufacturing both the mill and forming equipment and extends technological capabilities way. The consequence of the equality of the speeds of the moving profile and the working surface of non-driven rollers is to improve the quality of the finished profiles.
 In FIG. 1 shows a diagram of a device for manufacturing corrugated profiles; in FIG. 2 diagram of the formation of a profile from a strip.
In the 1st transition, the flat workpiece 1 is subjected to lateral bending along the arc with drive rollers and the mill will be guided. In non-drive transition rollers 11 arranged in a certain order along the guide arc, axial forces F 1 acting on the workpiece from the transition side 1 form simultaneously longitudinal corrugations with rounded vertices over the entire cross section. Then, in several similar transitions (III-V), under the action of axial forces F 2 , F 3 , F 4, the corrugations are deepened with a decrease in the transverse curvature of the wavy heading 2, with F 1 > F 2 > F 3 > F 4 . In the driven calibrated rollers of the VI transition, the workpieces 2 are straightened to obtain a rectilinear wavy workpiece 3. In the final VII transition, the profile elements are upset to the desired configuration
An experimental verification of the method was carried out in the manufacture of profiles from aluminum alloys D16M and AMts2M 1.2 mm thick with seven periodically repeating corrugations 22 mm deep and 22 mm wide on the wall (300x22x1.2 mm) and with four corrugations 20 mm deep and 130 mm wide on the wall (580x20x1.2mm), and the first profile was formed while reducing the projection width of the workpiece on a horizontal plane, and the second with a constant projection width.
 Profiles made by this method are of good quality, straightforwardness and geometry stability.
 The method in comparison with the known has the following advantages.
 Expands the technological capabilities of the method of manufacturing corrugated profiles in a simultaneous system, since it allows you to get profiles with a large number of corrugations, including with wide extreme straight sections, for a small number of transitions.
 It allows to improve the quality of multi-profile profiles due to the weakening of the molding mode and the creation of more favorable conditions for the formation of corrugations.

Claims (1)

  1.  A method of manufacturing bent corrugated profiles, in which the sheet blank is preliminarily bent along an arc, after which corrugations are molded simultaneously flexible along the entire cross section with a gradual decrease in the obtained curvature of the workpiece, characterized in that the corrugations are formed in two stages, in the first of which the corrugations are formed with rounded tops pushing the workpiece through non-drive rollers located along the guide arcs, and on the second, the profile elements are upset to the desired configuration.
SU5041245 1992-05-07 1992-05-07 Method of making bent corrugated sections RU2088355C1 (en)

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SU5041245 RU2088355C1 (en) 1992-05-07 1992-05-07 Method of making bent corrugated sections

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SU5041245 RU2088355C1 (en) 1992-05-07 1992-05-07 Method of making bent corrugated sections

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RU2088355C1 true RU2088355C1 (en) 1997-08-27

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002022285A1 (en) * 2000-09-15 2002-03-21 Bhp Steel (Jla) Pty Ltd Method and apparatus for the continuous press-forming of wide panels
AU2001285613B2 (en) * 2000-09-15 2007-08-09 Bluescope Steel Limited Method and apparatus for the continuous press-forming of wide panels
RU2544186C2 (en) * 2009-11-11 2015-03-10 Маурер Зёне Инжиниринг Гмбх Энд Ко. Кг Device for strapping of deformation joints, shaped structure and method for obtaining joint profiles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Тришевский И.С., Клепанда В.В., Хижняков Я.В. Холодногнутые гофрированные профили проката. - Киев: Техника, 1973, с.154-156. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002022285A1 (en) * 2000-09-15 2002-03-21 Bhp Steel (Jla) Pty Ltd Method and apparatus for the continuous press-forming of wide panels
AU2001285613B2 (en) * 2000-09-15 2007-08-09 Bluescope Steel Limited Method and apparatus for the continuous press-forming of wide panels
RU2544186C2 (en) * 2009-11-11 2015-03-10 Маурер Зёне Инжиниринг Гмбх Энд Ко. Кг Device for strapping of deformation joints, shaped structure and method for obtaining joint profiles

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