EP2085163B1 - Cold rolling process for the production of a profile - Google Patents

Description

• Biegen des Ausgangsmaterials unter Anbringen zumindest eines entlang der Walzrichtung verlaufenden abgebogenen Abschnitts, wobei mit dem zumindest einen abgebogenen Abschnitt eine Biegung in dem Ausgangsmaterial ausgeformt wird, und
• Umformen des Ausgangsmaterials in Breitenrichtung des Ausgangsmaterials unter bereichsweiser Dickenreduzierung des Ausgangsmaterials, so dass das Ausgangsmaterial zumindest einen dickenreduzierten Bereich sowie nicht-dickenreduzierte Abschnitte aufweist,

wobei die zumindest eine Biegung vor oder während der Dickenreduzierung ausgeformt wird, und wobei der abgebogene Abschnitt ein nicht-dickenreduzierter Abschnitt ist.The invention relates to a cold rolling process for producing a profile from a one-piece rolling stock as a starting material by means of forming regions of rolls according to the preamble of claim 1, and comprising the method steps:

• Bending the starting material with attaching at least one along the rolling direction extending bent portion, wherein with the at least one bent portion, a bend in the starting material is formed, and
• Reforming the starting material in the width direction of the starting material with area-wise reduction in the thickness of the starting material, so that the starting material has at least one thickness-reduced area and non-thickness-reduced portions,

wherein the at least one bend is formed before or during the thickness reduction, and wherein the bent portion is a non-thickness reduced portion.

Under cold rolling process is understood in the art working with rollers or rollers forming process of a one-piece rolling stock below its recrystallization temperature.

Rolled profiles are known in various embodiments. In material-intensive profiles, as they represent, for example, C-shaped mounting rails, the vast majority of the manufacturing cost of the material. Thus, savings in material lead to a significant reduction in manufacturing costs.

For static reasons, a profile does not necessarily have to have a constant thickness or material thickness over its circumference. Thus, in the less stressed sections of a profile, the thickness can be partially reduced and thus material can be saved. A partial reduction in thickness by a single-stage rolling in cold rolling on a strip-shaped rolling is not useful because due to the friction transverse to the roll and the stiffness of the flat rolled material reduction is converted only in an extension in the longitudinal direction or in the feed direction and a material consolidation. This leads to internal stresses and strong distortions of the rolling stock.

From the EP 0 259 479 B1 a cold rolling method is known in which the starting material in several stations between rotating mandrel elements and rotating pressure rolling elements, each having obliquely to the axis of rotation of the rolls aligned forming regions, reduced in thickness and widened in the direction of the slope. The thickness reduction is analogous to a deep drawing process.

A disadvantage of the known solution is that this cold rolling allows only for profiles with a trapezoidal cross-section reduction of the required stations in the rolling mill for the production of the profile. Due to the inclined forming regions, the pressure rolling elements have different effective diameters at their forming regions, which leads to abrasion and thus to undesired traces in the profile.

From the US 3,209,432 is a cold rolling process for producing a profile of a one-piece rolling stock as a starting material by means of the forming forming regions of rolls known, wherein the forming regions are each aligned parallel to the axis of rotation of the corresponding roll. First of all, the starting material is shaped in the widthwise direction of the starting material by the forming regions oriented parallel to the axis of rotation of the rolls, and then bent into the desired profile shape.

The DE 33 43 709 A relates to a method for forming a frame part for use in a motor vehicle for receiving bending stresses acting thereon, comprising the steps of: rolling a metal sheet to form a recess on a surface of the metal sheet so as to obtain a tapered portion extending longitudinally of the metal sheet, wherein the thickness of the metal sheet near the longitudinal centerline is smaller than near each side, and bending the rolled metal sheet in the longitudinal direction to form a U-section having a land and legs on opposite sides of the web are bent in the same direction.

The JP 61-027103 describes a forming process in which successively act several different roles on a workpiece.

From the EP 1 847 333 A1 is a method for reducing the thickness of one-piece rolling produced, in which the starting material by means of the Walzgutbreite different depths penetrating into the starting material rolls in the width direction, characterized in that by means of at least two oppositely arranged profile rollers longitudinal waves are rolled, the wave crests and wave troughs themselves extend parallel to the longitudinal extent of the rolling stock, and the area provided with longitudinal waves is then flat-rolled over at least two oppositely arranged rollers.

The nearest one EP 1 847 334 A1 describes a method for reducing the thickness of one-piece rolling stock, in which the starting material by means of Walzgutbreite different deep penetrating into the starting material rolls in the width direction is transformed, wherein provided in a first step, the rolling stock with at least two, at a distance parallel to the longitudinal extent bends is and in a further step by means of two oppositely arranged rollers, each having at least one obliquely arranged to the axis of rotation of the rollers Abprägebereich, the area between the bends in the thickness is reduced.

The object of the invention is to provide a cold rolling process in which there is an improvement in the expansion of the one-piece rolling stock and an improvement in the economic efficiency of the process.

The object is solved by the features of independent claim 1. Advantageous developments are set forth in the subclaims.

The invention is characterized in that the cold rolling method comprises a further method step in which the at least one non-thickness-reduced, bent section is bent back into a profile prior to further processing of the width-converted and bent starting material so that the at least one before or during the thickness reduction formed bend is canceled before forming the reduced thickness starting material to the desired profile again.

• Biegen des Ausgangsmaterials unter Anbringen zumindest eines entlang der Walzrichtung verlaufenden abgebogenen Abschnitts, und
• Umformen des Ausgangsmaterials in Breitenrichtung des Ausgangsmaterials unter bereichsweisen Dickenreduzierung des Ausgangsmaterials.

According to the invention, the cold rolling process for producing a profile comprises, among other things, the process steps:

• Bending the starting material with attaching at least one along the rolling direction extending bent portion, and
• Forming of the starting material in the width direction of the starting material under area-wise reduction in the thickness of the starting material.

With the at least one bent portion, a bend in the starting material is formed and thus created a further extending in the rolling or longitudinal edge in the starting material or in one piece rolling, which compared to the distance from the to be created thickness-reduced area to the free, in rolling or extending in the longitudinal direction edge of the one-piece rolling a smaller distance. As a result, in the case of thickness reduction with the multi-stage cold rolling process, a comparatively larger width is generated for the same number of stations of the rolling mill.

Instead of a separate counter roll for each forming a region having roll at each rolling station, the anvil also by a table which spans a plane parallel to the axis of rotation of the rollers plane, or be formed by a large counter-roller whose axis of rotation and at least partially their lateral surface parallel to the Rotation axes of the rollers is aligned with the forming areas. Furthermore, the expansion of the one-piece rolling stock can also be achieved by two opposite rollers take place with forming areas whose forming areas face each other.

Advantageously, according to the number of bends required to produce the desired profile, an equal number of bent portions or bends are provided at the corresponding positions on the starting material and the reduction in thickness at the respective sides between two bends or between a bend and the free edge of the Starting material performed. If the deformed profile has a plurality of thickness-reduced sections or regions, then these regions are advantageously formed simultaneously. Alternatively, the thickness reduction of the individual areas takes place successively in several rolling steps.

Preferably, in a first process step, the bending of the starting material and then the deformation of the starting material in the width direction of the starting material. Thus, the at least one bend is provided before the spreading of the starting material. The starting material is first bent, for example by means of profiling rollers in a mold, the z. B. corresponds substantially to the final shape of the profile to be produced, and then by means of the rollers with the forming areas in the desired portions of the starting material partially reduced in thickness.

In a further embodiment of the cold rolling process, the bending of the starting material and the transformation of the starting material in the width direction of the starting material take place simultaneously. In this case, the at least one bent portion or the bend is formed during the spreading at least at the beginning of the spreading of the starting material, whereby the number of required stations of the rolling mill for the production of the profile is reduced. The bending and forming is thus advantageously at least in the initial phase of a multi-stage cold rolling process. Advantageously, at each station of the rolling mill one of the roll with the forming area opposite counter roll is provided with a support portion and at least one support portion which holds the starting material in position during processing and supports the forming of the at least one bend in the starting material.

The forming of the starting material in the width direction of the starting material preferably takes place by means of laterally offset forming regions of rolls following one after the other in the feed direction. By offset in the transverse direction, in the Starting material penetrating forming regions of the rolls is advantageously ensured that the deformation of the starting material takes place only in the width direction in a multi-stage cold rolling process. The spreading of the starting material can take place on the one hand only on one side or on both sides in a direction parallel to the width direction of the starting material.

Preferably, the stock is gradually bent from roll to roll to the profile having the desired shape. This allows a simple production of the profile with a small number of required stations of the rolling mill without the generation of significant stresses in the starting material.

According to the invention, the at least one bent section is bent back into a profile in a further method step before the further processing of the formed and bent starting material. The at least one formed before or during the reduction in thickness bend is used in this embodiment of the multi-stage cold rolling process only as an auxiliary bend and is repealed before forming the reduced-thickness starting material to the desired profile. The auxiliary bend allows during the reduction in thickness an advantageous spreading of the starting material and at the same time ensures great flexibility in the design of the cross section in the production of the profile.

Advantageously, the forming areas of the rollers penetrate equally deep into the starting material. This results in the width direction, d. H. transverse to the feed direction or to the rolling direction, between the reduced in thickness and the non-reduced in thickness sections of the starting material only homogeneous, oblique thickness transitions, which also have a small extent transverse to the feed direction. Furthermore, the reduced thickness portion of the starting material has a favorable surface quality.

Fig. 1 A-C

Ein erstes Ausführungsbeispiel eines Kaltwalzverfahrens in drei Einzelschritten;

Fig. 2

ein mit dem nach den Fig. 1A-C hergestelltes Profil in einer Perspektive; und

Fig. 3 A-D

ein zweites Ausführungsbeispiel eines Kaltwalzverfahrens in vier Einzelschritten.

The invention will be explained in more detail below with reference to embodiments. Show it:

Fig. 1 AC

A first embodiment of a cold rolling process in three steps;

Fig. 2

one with the after the Fig. 1A-C produced profile in a perspective; and

Fig. 3 AD

A second embodiment of a cold rolling process in four steps.

Basically, the same parts are provided with the same reference numerals in the figures.

In the FIGS. 1A to 1C is a first embodiment of a cold rolling process for producing a in FIG. 2 shown U-shaped profile 16 of a one-piece rolling stock as the starting material 6 shown schematically in three steps, in which the starting material 6 for the area reduction in thickness serving by forming, laterally offset forming regions 28, 38, 48 of successively following in the feed direction rollers 26, 36, 46 is formed as a thickness reducing rollers in the width direction of the starting material 6.

First, the flat starting material 6 in a first station 21 of a rolling mill in a region 7 between a first counter-roller 22 rotating about a rotation axis 23 and an opposing first roller 26 rotating about a rotation axis 27 having a forming region 28 having a width A. , reduced in thickness and spread over a certain extent. The spreading of the starting material 6 takes place by means of the forming region 28 of the roller 26 in a plane parallel to its axis of rotation 27 or in the rolling stock plane in the direction of the axis of rotation 27.

The first counter-roller 22 has a support region 24 extending parallel to its axis of rotation 23 and two mutually-inclined support regions 25 extending at an angle O to the rotation axis 23 on the outside. The first roller 26 with the forming area 28 has, on the outside and spaced from the forming area 28, two profiling areas 29 extending parallel to the supporting areas 25, which are inclined approximately or at the same angle as the supporting areas 25 of the first counter-roller 22. In an alternative embodiment, not shown, of the first roller 26, the forming area of the roller extends into its profiling areas. In this case, two in the rolling direction or in the longitudinal direction of the starting material 6 extending bent portions 8 are attached. At the same time, the thickness reduction of the starting material 6 is formed between these bent portions 8 in an initial stage of the multi-stage cold rolling process. Bends, which form an additional edge spaced apart from the free edge 9 in the starting material 6, thus run between the area 7 to be reduced in thickness and a free edge 9 of the starting material 6.

In another, in FIG. 1B illustrated station 31 of the rolling mill, the pre-profiled and partially reduced in thickness starting material 6 is further formed and the thickness-reduced region 7 further widened. This takes place between a second counter-roller 32 rotating about an axis of rotation 33 and an opposite first roller an axis of rotation 37 rotating roller 36 having a forming portion 38 having a width B. The width B of the forming area 38 of the second roller 36 is greater than the width A of the forming area 28 of the first roller 26, wherein the forming area 38 with respect to a rolling axis of symmetry of the rollers 26 and 36 with respect to the forming area 28 of the first roller 26 widened on both sides. The spreading of the starting material 6 is also effected here by means of the forming region 38 of the roll 36 in the rolling stock plane in the direction of the axis of rotation 37.

The second counter-roller 32 has a support region 34 extending parallel to its axis of rotation 33, which in this embodiment has the same width M as the support region 24 of the first counter-roller 22, and on the outside two mutually inclined support regions 35 running at an angle P to the axis of rotation 33 , The support portions 35 are inclined more than the support portions 25 of the first counter roll 22, so that the angle P is greater than the angle O is. The second roller 36 has on the outside and spaced from the forming area 38 two parallel to the support portions 35 of the second counter-roller 32 extending profiling regions 39 which are inclined approximately or at the same angle as the support portions 35 of the second counter-roller 32. In this case, the bent portions 8 of the starting material 6, which at the end ( Fig. 2 ) form the side walls 17 of the U-shaped profile 16, further inclined to the thickness-reduced portion 7 and thus to the bottom portion 18.

In a last, in Figure 1C shown station 41 of the rolling mill, the pre-profiled and already partially reduced in thickness starting material 6 is further formed and the thickness-reduced area 7 widened to the final Mass. This takes place between a third counter-roller 42 rotating about a rotation axis 43 with a support region 44 extending parallel to its rotation axis 43 and an opposing third roller 46 rotating about an axis of rotation 47 with a deformation region 48 having a width C. The width C of the forming area 48 of the third roller 46 is greater than the width B of the forming area 38 of the second roller 36, wherein the forming area 48 with respect to an axis of symmetry extending in the rolling direction of the rollers 26, 36 and 46 with respect to the forming area 28 and 38 of the roller 26 and 36 widened on both sides. The spreading of the starting material 6 is also effected here by means of the forming region 48 of the third roller 46 in the rolling stock plane in the direction of the axis of rotation 47. Further, two opposing straightening rollers 52 are provided, the axes of rotation 53 perpendicular to the axis of rotation 47 and 43 of the third roller 46 and the third counter-roller 42 are aligned and the reduced thickness and preformed starting material 6 to a, as in Fig. 2 illustrated, U-shaped profile 16 consisting of bottom portion 18 and side walls 17 reshape.

It is natural for the expert that for carrying out the inventive cold rolling process z. B. depending on the initial thickness or material properties of the starting material 6 and the final profile shape more than three stations of a rolling mill for the production of the profile are required. In this embodiment, a spreading of the starting material 6 is described, which takes place on both sides in the width direction. However, the spreading can only be done on one side, which z. B. in a starting material having a large dimension in the width direction or when introducing a plurality of thickness-reduced areas simultaneously in the starting material is advantageous. Essential in the previously described and in the FIGS. 1A to 1C shown cold rolling process is that the bent portions 8 formed in the initial phase, at the beginning of the cold rolling process or during the gradual spreading of the starting material 6 of the successive rollers 26 and 36 in the feed direction with the forming regions 28 and 38 and in cooperation with the counter rolls 22nd and 32 the stock material 6 from roll 26 to roll 36 are gradually formed into the desired profile shape. In an embodiment, not shown, carried out in individual stations of the rolling mill, a spread of the starting material 6 without the bent portions 8 are further changed.

In contrast to the previously described cold rolling process is in which in the FIGS. 3A to 3D schematically illustrated cold rolling process before the Dickenredzierung the one-piece rolling stock as the starting material 56 this bent in advance in at least one Profilierungsstation 55 and thus also in an initial phase of the cold rolling process in the desired profile shape. In a further station 61 of the rolling mill then the profiled and provided with two in the rolling or longitudinally extending bent portions 58 starting material 56 between a rotating about a rotation axis 63 counter-roller 62 and about a rotation axis 67 rotating roller 66 with a forming area 68 in a Area 57 reduced in thickness. The thickness reduction of the starting material 56 takes place between the two bent sections 58 and the two bends in the starting material 56. In the illustrated embodiment, the width E of the forming area 68 of the roller 66 substantially corresponds to its entire width.

In the following stations 71 and 81, the width F or G of the corresponding forming region 78 or 88 of the roller 76 or 86 respectively increases until the desired width of the thickness-reduced region 57 in the profiled and reduced-thickness starting material 56 is reached. During spreading, the starting material 56 and the thickness-reduced region 57 in the stations 71 and 81 are each supported by a cylindrical mating roll 72 and 82, respectively.

All forming areas 68, 78 and 88 of the rollers 66, 76 and 86 spread the starting material 56 in a plane parallel to the axis of rotation 67, 77 and 87 of the rollers 66, 76 and 86, respectively, in the rolling stock plane in the direction of the axes of rotation 67, 77 or 87.

Claims (4)

1. Cold rolling process for fabricating a section (16) from one-piece rolling stock as initial material (6; 56) by means of material-forming regions (28, 38, 48; 68, 78, 88) of rolls (26, 36, 46; 66, 76, 86), comprising the process steps of:

   - bending the initial material (6; 56) so as to provide at least one bent-up portion (8; 58) extending along the rolling direction, a bend in the initial material being formed with the at least one bent-up portion (8; 58), and

   - forming the initial material (6; 56) in the transverse direction of the initial material (6; 56) with local reduction of the thickness of the initial material (6; 56) so that the initial material (6; 56) has at least one region of reduced thickness (7, 57) and portions of non-reduced thickness,
   the at least one bend being formed before or during the reduction in thickness, and the bent-up portion (8; 58) being a portion of non-reduced thickness,
   characterized in that
   the cold rolling process includes a further process step in which, prior to further processing into a section of the initial material formed in the transverse direction and bent, the at least one bent-up portion (8; 58) of non-reduced thickness is bent back so that the at least one bend formed before or during the reduction in thickness is removed again before the initial material of reduced thickness is formed into the desired section.
2. Cold rolling process according to Claim 1, characterized in that the bending of the initial material (6; 56) is performed in a first process step, and the forming of the initial material (6; 56) in the transverse direction of the initial material (6; 56) is performed subsequently.
3. Cold rolling process according to Claim 1, characterized in that the bending of the initial material (6; 56) and the forming of the initial material (6; 56) in the transverse direction of the initial material (6; 56) are performed simultaneously.
4. Cold rolling process according to any one of Claims I to 3, characterized in that the forming of the initial material (6; 56) in the transverse direction of the initial material (6; 56) is performed by means of laterally offset forming regions (28, 38, 48; 68, 78, 88) of a series of rolls (26, 36, 46; 66, 76, 86) following one after the other in the feed direction.

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