Machine and method for straightening steel sections

Abstract

The invention relates to a straightening machine (1) for straightening steel profiles, in particular to a straightening machine (1) with doubly supported straightening shafts (4), on each of which straightening rolls (5) of a straightening roll set are arranged for engagement in a forming chamber (7) of the profile to be straightened, the axial spacing of the straightening rolls (5) of at least one straightening roll set of at least one straightening shaft (4) being adjustable corresponding to the profile chamber dimensions, and the at least one axially displaceable straightening roll (5) of the straightening roll set is arranged on an adjustable bearing bush (11) which engages in an adjusting nut (15) which allows an adjustment of the bearing bush (11) by a rotation of the straightening shaft (4) by a drive of the straightening shaft (4). The invention further relates to a method for straightening steel profiles using the straightening machine (1).

Description

[Technical field]

[0001] The present invention relates to a straightening machine for straightening steel profiles, in particular a straightening machine with doubly supported straightening shafts, on each of which a straightening roll of a straightening roll set is arranged for engagement in the forming chamber of the profile to be straightened.

[0002] The invention particularly relates to a straightening machine for straightening rolled supports, in particular for straightening so-called H-beams. [Background technology]

[0003] Straighteners with adjustable chamber dimensions are basically known in the prior art. Thus, from DE 43 23 468 A1, a straightener for rolled supports is known, in which at least one of the straightener plates supported by a straightener shaft, which is applied from the inside against both flanges of the support, is axially adjustable. In this straightener, the outer dimensions or the chamber dimensions of the straightener plates can be changed quickly in a simple manner. In the solution according to DE 43 23 468 A1, it is proposed to use a worm gear drive for the straightener plate sliding, in which the straightener plate is rigidly connected to an annular sleeve or a sliding bushing on which the worm gear drive acts. The straightener according to DE 43 23 468 A1 is a so-called cantilever straightener, in which the straightener shaft is supported only on one side. In such machines, if the straightening plates are to be adjusted to a smaller or larger mutual distance, it is first necessary to release the straightening plates clamped on one side of the straightening shaft by the clamping head of the straightening shaft and rotate the worm and thus the worm gear. In this case, the annular sleeve with the associated straightening plates is slid until the desired distance is reached, which can be adjusted, for example, by means of a gauge or caliper. The required clamping of the straightening plates or straightening rolls is then established again by the clamping head.

[0004] Another embodiment of a straightener with adjustable chamber dimensions is known, for example, from DE 43 24 416 A1. In this straightener, which also comprises a straightening shaft supported on one side, a support ring is arranged between the straightening plates for a number of hydraulic cylinders distributed internally over the circumference, the working pistons of which are connected to the straightening plates.

[0005] From EP 0 953 385 B1 a straightening machine for rolled supports is known in which the straightening plates supported by the straightening shaft are axially adjustable, one straightening plate being rigidly connected to the straightening shaft via a mounting bush, while the second adjustable straightening plate rests on the opposite side, corresponding to its adjustment dimension, on a sliding bush which is adjustably arranged on the mounting bush. A piston-cylinder unit is arranged in the middle of the straightening shaft and is provided both for positioning the sliding bush alone or for adjusting the chamber dimension and for extracting the mounting bush together with the sliding bush.

[0006] The methods known in the prior art for adjusting the chamber dimensions of the straightener cannot be easily transferred to a double-supported straightening shaft, since access to the components of the straightener is not as available as in the case of cantilever straighteners, and in such machines, if the installed roller spacing results in dimensions or shapes that are not within the tolerances, it may be necessary to install a new set of straightening rolls, which is relatively time-consuming. From EP 0 769 335 A1 a straightener is known which is described in the preamble of claim 1. Further prior art is known from US Pat. No. 5,109,687, JP 10-286623 A1 and JP 10-192925 A1. Summary of the Invention [Problem to be solved by the invention]

[0007] The object of the present invention is therefore to provide a straightening machine with a straightening shaft supported on both sides of the type mentioned at the beginning, in which it is possible to relatively simply adjust the chamber size or the distance between the individual straightening plates. [Means for solving the problem]

[0008] This problem is solved by the features of claim 1. Advantageous configurations of the invention are set forth in the dependent claims.

[0009] This problem is further solved by the claim 7 The above-mentioned problems are solved by providing a method having the following features.

[0010] One aspect of the invention relates to a straightening machine for straightening steel profiles, in particular a straightening machine with doubly supported straightening shafts, on which are respectively arranged straightening rolls of a straightening roll set for engaging in a forming chamber of the profile to be straightened, the axial spacing of the straightening rolls of at least one straightening roll set of at least one straightening shaft being adjustable corresponding to the chamber dimensions of the profile, and at least one axially displaceable straightening roll of the straightening roll set being arranged on an adjustable bearing bush, the bearing bush engaging an adjusting nut which allows adjustment of the bearing bush by rotation of the straightening shaft by a drive device of the straightening shaft.

[0011] In the sense of the present invention, axially means parallel to the longitudinal axis of the straightening shaft or parallel to the axis of rotation.

[0012] An important aspect of the invention is that the straightening rolls or straightening plates, respectively, are preferably arranged in pairs such that one straightening roll is arranged on a fixed bearing bush and the associated other straightening roll is arranged on a bearing bush (sliding bush) which is adjustable relative to the fixed bearing bush, and the mutual distance between these bearing bushes is adjustable by the main drive of the straightening machine or by the drive of the straightening shaft in question, i.e. according to the invention, the assembly of one straightening roll is mounted on a sliding bush which is axially adjustable along the straightening shaft by the main drive of the straightening machine.

[0013] The straightener according to the invention is designed for straightening rolled supports including double T-shaped or H-shaped profiles. However, those skilled in the art can appreciate that the straightener can also be provided for straightening profiles such as U-shaped profiles having profile legs spaced apart from one another.

[0014] Correction according to the present invention By machine It is envisaged that the adjusting nut is connected to the straightening shaft in a first locked position so as not to rotate relative to the straightening shaft and is fixed so as not to rotate relative to the straightening shaft in a second unlocked position, whereby rotation of the straightening shaft results in axial displacement of the adjustable bearing bush.

[0015] The adjustable bearing bush can be connected, for example by means of a mating key, in a rotation-tight manner to a mounting bush which is also connected in a rotation-tight manner to the straightening shaft.

[0016] According to the present invention The straightening machine according to the invention has means for locking and unlocking the adjusting nut at predetermined angular positions of the straightening shaft.

[0017] For this purpose, the straightening machine according to the invention has at least one unlocking mechanism, which is preferably formed in the form of an unlocking pin or an unlocking bolt. Cage The unlocking mechanism engages with the locking mechanism of the adjusting nut at a predetermined angular position of the straightening shaft, unlocks the adjusting nut with respect to the straightening shaft, and fixes the adjusting nut so that it cannot rotate. For this purpose, the unlocking mechanism may be fixedly arranged on a stand of the straightening machine or on an assembly member supported on the stand.

[0018] It is particularly advantageous if the unlocking mechanism comprises means for detecting or sensing the unlocked position of the adjusting nut.

[0019] According to the present inventionThe locking mechanism has at least one locking element which is spring-loaded and held in a first locking position, in which the locking element can form-lockingly engage with a mounting bush of the orthodontic shaft, for example, the mounting bush can have a collar with a toothed arrangement or an annular toothed arrangement, which engages with a counterpart with a toothed arrangement of the locking element in the locked position.

[0020] moreover The unlocking mechanism or unlocking pin or unlocking bolt is axially slidable to a deployed engagement position, in which it enters a catch opening in the adjusting nut. The unlocking mechanism can be formed, for example, as a hydraulically or pneumatically operable unlocking pin. The unlocking pin can be formed, for example, as a piston of a piston-cylinder device or can be operable by a piston-cylinder device that is attached to a stand or mounting part of the straightening machine.

[0021] The straightening shaft can be designed to be axially displaceable, so that the adjusting nut together with the straightening shaft can first be displaced into a waiting position in which it can cooperate with the unlocking mechanism.

[0022] Preferably, the unlocking mechanism has an inclined or conical engagement surface which cooperates with a complementary guide surface of the locking element to raise the locking element against the spring force into an unlocked position, in which the non-rotatable connection between the adjusting nut and the mounting bush or the straightening shaft non-rotatably connected to the mounting bush is eliminated. During operation of the straightening machine, the adjusting nut is fixed against possible rotational movements caused by the inertial mass or rotational movements of this part.

[0023] It is particularly advantageous if the locking mechanism has at least one sensor capable of detecting the catching opening of the adjusting nut. Such a sensor can most simply be an inductive or magnetic sensor which generates an unlocking signal when the guide end of the adjusting mechanism is aligned and aligned with the catching opening of the adjusting nut. In this case, when the locking mechanism engages in the catching opening of the adjusting nut, the locking element is raised to the unlocked position, and the adjusting nut is held non-rotatably by the unlocking mechanism.

[0024] A particularly preferred embodiment of the straightening machine according to the invention is characterized by at least one profile measuring device, which cooperates with a closed-loop and / or open-loop control device for adjusting the chamber dimensions of at least one straightening roll set. The profile measuring device can be, for example, a measuring device arranged downstream in the transport direction of the support or the profile for determining the profile shape of, for example, an H-shaped support profile, which measuring device is connected via an evaluation unit to a roll adjustment for the straightening rolls. The measuring device can, for example, be equipped with a laser device, which determines the geometry of the H-shaped support profile to be corrected and causes a corresponding roll adjustment or adjustment of the straightening rolls of at least one straightening axis.

[0025] The straightener according to the invention is preferably configured as a horizontal straightener with an upper roll pair and a lower roll pair. According to the invention, adjustability of the straightening rolls of the upper roll pair and / or the upper roll pair of at least one straightening shaft can be envisaged.

[0026] A further aspect of the present invention relates to a method for straightening steel sections using a straightening machine having one or more of the features described above, comprising the following method steps: a) detecting the actual contour of the steel profile before and / or after the straightening machine; b) comparing the actual contour with a given target contour; c) stopping the straightening process; d) adjusting the chamber size of at least one straightening roll device of at least one straightening roll set of at least one straightening shaft by rotating the straightening shaft by a given angle value; The present invention relates to a method comprising the steps of:

[0027] Preferably, the step of adjusting the chamber size is performed via a main drive of at least one straightening shaft, which rotates the straightening shaft by a given target angle based on an incremental encoder, depending on the desired chamber size.

[0028] The present invention will now be described with reference to the illustrated embodiments. [Brief description of the drawings]

[0029] [Figure 1] FIG. 2 is a cross-sectional view showing a straightener according to the present invention. [Diagram 2] FIG. 2 is an enlarged detail view of a portion of FIG. [Figure 3A] 3 is a vertical cross-sectional view taken along line III-III in FIG. 2, showing an unlocked position of the adjusting nut. [Figure 3B] 3 is a vertical cross-sectional view taken along line III-III in FIG. 2, showing a locked position of the adjusting nut. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] The straightening machine 1 shown in cross section in the drawing has several straightening shafts 4 supported in a stand 3 via mounting elements 2, on which straightening rolls 5 are arranged in pairs as straightening roll sets. The straightening machine 1 has an upper and a lower straightening roll pair, which are arranged relative to one another in such a way that they form a bending triangle with respect to the rolled support 6.

[0031] In the figures, only one upper straightening shaft 4 or an upper straightening roll set is shown. The straightening shaft 4 has several parts which are axially clamped together, which for the sake of simplicity will not be described in detail below.。 The lower straightening shaft 4 is not shown for the sake of simplicity.

[0032] The straightening shafts 4 are supported horizontally at their respective ends in the mounting elements 2, with the left side of the straightening shaft 4 in the drawing being the drive side and the right side being the so-called operating side. The drive or main drive of the straightening shafts 4 is not shown for the sake of simplicity. Only the axle pins of the drive are shown diagrammatically.

[0033] A straightening roll, designated 5, engages in the forming chamber 7 of the support 6 and rests on the inside against flanges 8 of the support 6. The distance between the flanges 8 inside the forming chamber 7 is called the chamber dimension. In the drawing, two different supports 6 with different chamber dimensions are shown diagrammatically.

[0034] The straightening shaft 4 is connected in an axially tensioned manner to a mounting bush 9 arranged on the straightening shaft 4 via a frictional connection so as to entrain the mounting bush. Each straightening roll 5 is connected to a bearing bush 10, 11 such that it cannot rotate relative to it, the bearing bush 10 on the left side of the drawing being configured as a stationary bearing bush and the bearing bush 11 on the right side of the drawing being axially adjustable relative to the mounting bush 9. The mounting bush 9 is also connected to the straightening shaft 4 in a rotationally fixed manner. The non-rotational nature of the adjustable bearing bush 11 relative to the mounting bush 9 and relative to the straightening shaft 4 is ensured by a mating key 12.

[0035] As can be seen in particular from the enlarged view of FIG. 2, the adjustable bearing bush 11 is provided with an external thread 14 on the side facing the collar 13 of the mounting bush 9, which meshes with an internal thread of an adjusting nut 15.

[0036] In the locked state, the adjusting nut 15 is connected to the mounting bush 9 in a rotationally fixed manner, i.e. the adjusting nut is held in a form-locking manner via a locking element 16 which engages in an annular toothing 17 on the circumferential surface of the mounting bush 9.

[0037] The locking element 16 is spring-loaded to be held in a locked position (see FIG. 3B) and is slidably supported inside a guide passage 18 which extends radially around the adjusting nut 15 .

[0038] Both the locking element 16 and the collar 19 of the adjusting nut 15, which surrounds the guide passage 18, are penetrated by a catch opening 20, into which an unlocking pin 21, which is held in the mounting part 2 of the straightening machine 1, can enter. The locking pin 21 can be moved in and out via a first piston-cylinder arrangement 23, which in the arrangement shown in FIG. 1 is attached to the mounting part 2 of the stand 3. The first piston-cylinder arrangement can also be attached to the stand 3. A sensor 25, which is formed, for example, as an inductive sensor for detecting the catch opening 20 in the adjusting nut 15, is fitted to the guide end of the unlocking pin 21.

[0039] 3A and 3B, the entry of an unlocking pin 21 as an unlocking mechanism results in the locking element 16 being raised, according to the invention, inside the guide channel 18. In the locked position shown in Fig. 3B, the locking element 16 engages with the annular teeth 17 of the mounting bush 9 with the tooth plate 22, which ensures a non-rotatable connection between the adjusting nut 15 and the mounting bush 9 in the locked state shown in Fig. 3B.

[0040] The unlocked state shown in Fig. 3A shows the unlocking pin 21 fully inserted into the catch opening 20 and into the breakaway portion 27 of the locking element 16. The breakaway portion 27 in the locking element 16 has an inner guide ramp 26 which cooperates with the conical tip of the unlocking pin as a wedge guide.

[0041] 3A, the unlocking pin 21 has raised the locking element 16, so that the tooth plate 22 is raised from the annular toothing 17 and the straightening shaft 4 together with the mounting bush 9 is separated from the adjusting nut 15. By rotating the straightening shaft 4 about its longitudinal axis, the adjusting nut 15 is displaced axially, the adjusting nut being fixed against rotation by the unlocking pin 21.

[0042] The adjustment of the chamber size or the axial spacing between the straightening rolls 5 is first performed by stopping the straightening machine 1. The straightening shaft 4 is displaced towards the right by a second piston-cylinder device 24 (FIG. 1), so that the sensor 25 of the unlocking pin 21 is spaced so close to the collar 19 of the adjusting nut 15 that the collar 19 is located within the detection range of the sensor 25. The different positions of the straightening shaft 4 and thus of the adjusting nut 15 are shown in phantom lines in FIG. 2. The straightening shaft 4 is then slowly rotated about its longitudinal axis until the sensor 25 detects the catch opening 20. When the capture opening 20 and the unlocking pin 21 are oriented so as to be aligned with each other, the unlocking pin 21 is brought into the run-out position (see arrow in FIG. 2 ), and as the unlocking pin enters the capture opening 20, its conical tip forming a conical engagement surface cooperates with a guide ramp 26 formed complementary to the breakaway portion 27 of the locking element 16, lifting the locking element 16 as it enters the breakaway portion 27, so that the tooth plate 22 of the locking element 16 disengages from the annular tooth row 17.

[0043] The unlocking pin 21 prevents the adjustment nut 15, which in this position (FIG. 3A) is separated from the mounting bush 9, from rotating. By means of an incremental encoder integrated in the main drive of the straightening shaft 4, the straightening shaft 4 is rotated by a predefined angular value until a target angle is reached which corresponds to a defined, predetermined adjustment distance of the straightening rolls 5 relative to one another.

[0044] Once the adjustment process is completed, the unlocking pin 21 is brought into the retracted position and the straightening shaft 4 is again moved to the left by the second piston-cylinder device 24 back to its initial position. [Explanation of symbols]

[0045] 1 straightening machine 2 Assembly parts 3. Stand 4 Correction axis 5 Straightening roll 6 Support 7 Molding Chamber 8 Flanges 9 Assembly bush 10 Stationary bearing bush 11 Adjustable Bearing Bushings 12 Mating Key 13 Assembly bush color 14 Male thread 15 Adjustment nut 16 Rock Element 17 Annular dentition 18 Guide passage 19 Adjustment nut color 20 Capture Aperture 21 Unlocking pin 22 Dental Plate 23 First piston-cylinder device 24 Second piston-cylinder device 25 Sensors 26 Guide inclination 27 Breaking Part

Claims

1. The invention relates to a straightening machine (1) for straightening steel profiles, in particular a straightening machine (1) with doubly supported straightening shafts (4), on which are respectively arranged straightening rolls (5) of a straightening roll set for engaging in a forming chamber (7) of the profile to be straightened, the axial spacing of the straightening rolls (5) of at least one straightening roll set of at least one straightening shaft (4) being adjustable in accordance with the chamber dimension of the profile, the at least one axially displaceable straightening roll (5) of the straightening roll set being arranged on an adjustable bearing bush (11), the bearing bush engaging an adjusting nut (15) which allows the adjustment of the bearing bush (11) by means of a rotation of the straightening shaft (4) by means of a drive of the straightening shaft (4), the adjusting nut (15) being fixedly attached to the straightening shaft (4) in a first locking position so as not to rotate relative to the straightening shaft (4). a straightening machine having an adjusting nut (15) connected to the straightening shaft (4) and fixed non-rotatably in a second unlocked position relative to the straightening shaft (4), whereby a rotation of the straightening shaft (4) causes an axial displacement of the adjustable bearing bush (11), the straightening machine having means for locking and unlocking the adjusting nut (15) at a predetermined angular position of the straightening shaft (4) and at least one unlocking mechanism, preferably in the form of an unlocking pin (21), which engages with a locking mechanism of the adjusting nut (15) at the predetermined angular position of the straightening shaft (4), unlocks the adjusting nut (15) relative to the straightening shaft (4) and fixes the adjusting nut (15) non-rotatably, the locking mechanism having at least one locking element (16) which is spring-loaded and held in the first locked position, The straightening machine (1), characterized in that in the locked position, the locking element (16) engages in a form-locking manner with an assembly bush (9) of the straightening shaft (4), and the unlocking mechanism is formed as an unlocking pin (21) and is axially slidable from a standby position to a driven engagement position, in which the unlocking mechanism enters into a capturing opening (20) of the adjusting nut (15).

2. 2. The straightener (1) according to claim 1, wherein the unlocking mechanism comprises means for detecting the unlocked position of the adjusting nut (15).

3. 2. The straightener (1) according to claim 1, wherein the locking mechanism comprises at least one locking element (16) that is spring loaded to hold it in the first locked position.

4. 2. The straightener (1) of claim 1, wherein the unlocking mechanism has an inclined or conical engagement surface that cooperates with a complementarily formed guide surface on the locking element (16) to lift the locking element (16) to an unlocked position.

5. 2. The straightener (1) according to claim 1, wherein the unlocking mechanism comprises at least one sensor (25) capable of detecting the capture opening (20) of the adjusting nut (15).

6. 2. The straightening machine (1) according to claim 1, further comprising at least one profile measuring device which cooperates with a closed-loop and / or open-loop control device for adjusting the chamber dimension of at least one straightening roll set.

7. A method for straightening steel sections using a straightening machine (1) with the features of any one of claims 1 to 6, comprising the following method steps: a) detecting the actual contour of the steel profile before and / or after the straightening machine by means of a measuring device which cooperates with a closed-loop and an open-loop control device for adjusting the chamber dimensions of at least one straightening roll set and is connected via an evaluation unit to a roll adjustment for the straightening rolls; b) comparing said actual contour with a given target contour; c) stopping the correction process if a deviation between the actual contour and the target contour is detected; d) adjusting the chamber size of at least one straightening roll device of at least one straightening roll set of at least one straightening shaft (4) by rotating said straightening shaft (4) by a given angle value; The method includes:

8. 8. The method according to claim 7, wherein the step of adjusting the chamber size is performed via a main drive of at least one straightening shaft (4), which rotates the straightening shaft (4) by a given target angle depending on the desired chamber size based on an incremental encoder.

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