EP2366470A2 - Straightening roll, straightening roll assembly and dual roll straightening machine and straightening method - Google Patents

Abstract

The straightening roll has a straightening surface (21,22), which is curved along the roll axis and is defined by a corresponding curved generatrix (23,24). The generatrix has two turning points (25,26,27,28). Independent claims are also included for the following: (1) a straightening roll assembly with a straightening slot; and (2) a method for straightening of rotationally symmetrical work pieces.

Description

The invention relates to a straightening roller, which rotates about a straightening roller axis and is intended for straightening workpieces that are rotationally symmetrical with respect to a longitudinal axis, with a straightening surface curved along the straightening roller axis, which is defined by a correspondingly curved generatrix. Moreover, the invention relates to a straightening roller arrangement, which is intended for straightening workpieces that are rotationally symmetrical with respect to a longitudinal axis, with two straightening rollers arranged one above the other. In particular, the invention relates to a straightening roller arrangement, which is intended for straightening workpieces that are rotationally symmetrical with respect to a longitudinal axis, with two straightening rollers arranged one above the other, which form a straightening gap with a directional triangle. The invention also relates to a straightening roller arrangement with two straightening rollers arranged one above the other, which form a curved straightening gap. The invention also relates to a two-roll straightening machine and a method for straightening rotationally symmetrical workpieces to a longitudinal axis.

Generic straightening rollers, related straightening roller assemblies and in particular two-roller straightening machines are known from the prior art, for example from DE 23 57 570 A1 , Well known and are successfully used in a processing of elongated rod-shaped workpieces, more precisely for straightening such workpieces, and are in particular of straightening arrangements in which plates or sheets are perpendicular to the roll axes of straightening rollers through a corresponding aiming gap and thereby directed should and for example from the DE 16 02 468 C3 or the AT 402 267 B are distinguished, since in the generic straightening rollers, straightening roller arrangements and straightening often performed to a longitudinal axis rotationally symmetrical workpieces along the roll surface and thus the roll axes and the longitudinal axis of the workpieces are at an acute angle to each other or even arranged parallel to each other. Here, on the one hand, straightening machines with straightening rollers are known for rotationally symmetrical workpieces on a longitudinal axis, which are arranged on rigid, perpendicular to the continuous workpieces arranged behind one another and one above the other and bend the workpiece to be straightened in the required manner. Likewise, straightening rotors are known in which leveling rolls or directional nozzles are arranged on axes, which in turn rotate about the workpiece. In two-roll leveling machines, such as those in the DE 23 57 570 A1 are disclosed, the bending takes place only by two superimposed rollers which form a directional curved or a directional triangle-defining guide gap and roll around axes, which in turn at an angle to each other are arranged on both sides of a main passage direction.

It is an object of the present invention, in particular generic straightening rolls but also such straightening roller assemblies and two-roll straightening and straightening further develop preferably such that relatively thin and stiff rods can be addressed.

The object of the invention is achieved by a rotating about a roll axis, for straightening to a longitudinal axis rotationally symmetrical workpieces certain straightening roller with a straightening along the straightening roll axis straightening surface, which is defined by a correspondingly curved generatrix, wherein the straightening roller is characterized in that the Generating has at least one turning point.

It should be emphasized that a turning point is to be distinguished from a maximum or minimum of the generators, as this itself from the prior art, for example from the DE 23 57 570 A1 is known and what ultimately only a single direction of curvature of the corresponding roll surface, be it now on the one hand convex, bulbous, convex or convex or on the other hand domed or concave inside. At a turning point, however, the direction of curvature changes, so that usually both a minimum and a maximum can be found and the roller itself may well have a convex and a concave surface area.

If the present generatrix has at least one point of inflection according to the invention, the straightening roller can advantageously be designed with a corrugated profile, whereby in particular thinner or high-strength materials can be directed exceptionally favorably.

In contrast to previously, for example, concave, convex or cylindrical shaped and as straightening rollers opposite straightening rollers with which only a directional triangle in the region of two correspondingly corresponding straightening provide provide can succeed with the invention inventively straightening roller advantageously way beyond a suitable design several to design such straightening triangles with respect to a straightening roller pair.

As a result, in particular very thin wires or high-strength materials, such as spring steels, can be addressed even more precisely than before. Especially with regard to thin, high-strength materials, there has hitherto been the problem that very large inlet and outlet angles must be taken into account on a straightening roller pair, whereby a very small work area located only in the straightening roller center can be effectively used to sufficiently plasticize the wire to be straightened and thus to be able to judge. Especially these disadvantages can be avoided by means of the straightening roller according to the invention with a suitable design.

In particular, a substantially greater deflection of the workpiece or wire to be straightened with a smaller straightening roller length and a mean straightening roller diameter can be achieved particularly well with a straightening roller contour selected in this way. In this respect, a corresponding increase in performance can be achieved Although predetermined roll dimensions are met or exceeded, so that even existing roll levelers can be equipped with the present straightening roll and operated with increased directivity advantageous.

As used herein, the term "straightening roller" means any rotating cylindrical device along which an elongate, rotationally symmetric workpiece can be guided in a directional direction. Here, each of the straightening surface of a straightening roller is defined by a generatrix, which is guided around the straightening roller axis of the straightening roller around.

A particularly preferred embodiment provides that the generator has at least two inflection points. Because of at least two such inflection points, both an entry angle and an exit angle on a straightening roller pair can advantageously be reduced in a particularly far-reaching manner with respect to a workpiece or wire to be straightened for the same or ideally greater maximum deflection of the workpiece or wire to be straightened.

This advantageously also has the consequence that, in particular, height adjustment of the two rollers is largely dispensed with, or height adjustment can be minimized, which would almost always be required for different workpiece diameters or different rollers in order to achieve a sufficiently high level of precision.

The advantages of the straightening roller according to the invention can already be used outstandingly if only one of the straightening rollers of a straightening roller pair has a correspondingly designed generatrix.

In this respect, the object of the invention is also achieved by a straightening roller arrangement with two straightening rollers arranged one above the other, in which according to the invention at least one straightening roller according to one of the features described here, in particular according to one of the features described above, is configured.

If at least one of the two straightening rolls of the straightening roller arrangement has a generatrix with at least one point of inflection, it is possible, in particular, to advantageously direct very thin wires.

It is also extremely advantageous in the present context if both straightening rollers of the straightening roller arrangement are designed as straightening rollers according to the invention according to one of the features described herein. In particular, the memory effect of the respective material can be eliminated in this case particularly successfully.

Furthermore, if the two straightening rollers are each arranged at an angle with respect to the main machine direction, the present straightening roller arrangement can be used particularly advantageously in a manner known per se so that pinching limits with respect to the straightening rollers can advantageously be shifted in a manner known per se. The term "main passage direction" here refers essentially to the main transport direction of the workpiece in the direction of its longitudinal axis through the straightening roller arrangement.

Furthermore, regardless of the other features of the present invention, the object of the invention is achieved by a straightening roller arrangement intended for straightening workpieces that are rotationally symmetrical with respect to a longitudinal axis with two straightening rollers arranged one above the other and forming a straightening gap with a directional triangle, wherein the straightening gap comprises at least two straightening triangles having. By means of the two directional triangles at the guide gap, which, for example, the DE 23 57 570 A1 just does not have, since the roller shown there can only form a directional triangle, also specially thinner and / or high-strength materials, such as spring steels, can be very well directed.

If the two straightening triangles aligned symmetrically, the inlet and outlet angles can be approximated to the straightening roller assembly, which advantageously largely on a height adjustment, possibly completely, can be dispensed with, which almost always must be made at different workpiece diameters or different straightening rolls to to achieve a required directional precision.

In addition, proposes a further solution of the present task, a particular for straightening of a longitudinal axis rotationally symmetrical workpieces straightening roller assembly with two superposed straightening rollers, which form a curved straightening gap, wherein the straightening gap at least one turning point aufwei st.

A further solution to the object of the present invention proposes a two-roll straightening machine with a straightening roller arrangement according to one of the features explained here. By means of such straightening roller arrangement, a two-roll straightening machine can be built exceptionally compact with high straightening performance, since in particular can be dispensed with a height adjustment for straightening rollers.

Advantageously, the present two-roll straightening machine comprises in a known manner both an inlet guide and an outlet guide for workpieces. Although such guides are not directly involved in the actual bending process. However, they are so crucial that the workpieces have to be guided at a predetermined height to the straightening rollers or must be performed accordingly by the straightening rollers. Inadequate guidance of the workpieces could in the worst case, the straightening quality of the workpieces be adversely affected.

Likewise, the invention proposes as a solution to the object presented a method for straightening rotationally symmetrical to a longitudinal axis workpieces, which is characterized in that the workpiece by one of two Guiding gap formed above the straightening rollers is guided and guided this straightening gap in the axial direction at least by two differently curved areas.

It is understood that the features of the solutions described above or in the claims can optionally also be combined in order to implement the advantages in a cumulative manner. Although the design of two rolls of a two-roll straightening machine or a straightening roller arrangement with two rolls arranged one above the other with a two-directional triangular guide gap will also necessitate at least one point of inflection in the straightening gap. On the other hand, it is conceivable that the generators of at least one of the rollers have discontinuities which may not allow the definition of turning points. On the other hand, it is understood that a suitable arrangement of maxima, minima and turning points, as it results in a practical implementation of the present invention, can lead to two Richtdreiecke can not be defined. In this respect, the solutions proposed in the independent claims are genuine alternative solutions which, when used cumulatively, lead to two-roll straightening machines or corresponding straightening roller arrangements designed to be very advantageous. The same considerations apply to the surface design of the individual rollers, which could be combined, for example, with single rollers known from the prior art.

In this context, it should be emphasized that the term "one above the other" in the present context does not necessarily mean a vertical arrangement of both rolls, but it is sufficient if the two rolls are arranged opposite each other and can form a corresponding aiming gap. Preferably, since in particular of the handle relatively simple, but is a vertical superimposition of the two rolls.

Further advantages, objects and features of the present invention will be explained with reference to the following description of the attached drawing, in which by way of example a straightening roller arrangement comprising straightening rollers according to the invention as well as a correspondingly equipped two-roller straightening machine are shown.

Figur 1

schematisch eine Ansicht einer Richtwalzenanordnung mit zwei übereinander angeordneten Richtwalzen;

Figur 2

schematisch eine Aufsicht der Richtwalzenanordnung aus der Figur 1; und

Figur 3

schematisch eine Ansicht einer Zwei-Walzen-Richtmaschine mit einer Einlauf- und einer Auslaufführung.

In the drawing show:

FIG. 1

schematically a view of a straightening roller assembly with two straightening rollers arranged one above the other;

FIG. 2

schematically a plan view of the straightening roller assembly of the FIG. 1 ; and

FIG. 3

schematically a view of a two-roll leveler with an inlet and an outlet guide.

The in the FIG. 1 Straightening roller assembly 1 shown comprises an upper straightening roller 2 and a lower straightening roller 3, each about a straightening roller axis 4 and 5 in a related straightening roller 6 and 7 in a machine frame 8 of a two-roll straightening machine 9 (see in particular FIG. 3 ) are stored. The machine frame 8 comprises an upper part 10 and a lower part 11, which are connected to each other by tie rods 12 (numbered here only by way of example). The upper straightening roller frame 6 is on the underside of the upper part 10 and the lower straightening roller frame 7 is rotatably mounted on the upper side on the lower part 11 each about a horizontal axis of rotation 13. This allows an angle adjustment (see also FIG. 2 ) of the two straightening rollers 2 and 3 with respect to a main machine direction 14, which in the present case essentially coincides with the main passage direction 15 of a workpiece 16 to be straightened along its longitudinal axis 17.

According to the angular adjustment selected here with respect to the two straightening rollers 2 and 3, these are according to the illustration according to the FIG. 1 not in the paper plane, but, due to their respective employment, at least partially protrude from this level of paper, as in particular FIG. 2 daregstellt.

Here, the upper straightening roll 2 are set at an angle α (indicated here by the reference numeral 18) and the lower straightening roll 3 at an angle β (designated here by the reference numeral 19) relative to the main machine direction 14 about the horizontal axis of rotation 13.

Overall, the two straightening rollers 2 and 3 spaced from each other in the machine frame 8 are arranged to a directional gap 20, wherein the aiming gap 20 is curved in this embodiment, on the one hand and at least two inflection points (not numbered here) and at least two directional triangles (not shown here ), wherein the latter are advantageously also aligned symmetrically. Overall, an inlet and an outlet angle (also not shown here) can be advantageously reduced, which has a positive effect on the entire straightening process.

The two straightening rollers 2 and 3 are also characterized along their straightening roller axes 4 and 5 respectively by a curved directional surface 21 and 22, which in each case by a correspondingly curved generatrix 23 and 24 (see FIG. 2 ) are defined.

In this particular embodiment, both the first curved generatrix 23 has a first inflection point 25 and a second inflection point 26, and the second curved generatrix 24 has a first inflection point 27 and a second inflection point 28. As a result, especially thinner workpieces or wires can be particularly well directed.

The in the FIG. 3 shown and known per se two-roll straightening machine 9 can be equipped with the straightening rollers 2 and 3 described herein or with a corresponding straightening roller assembly 1 advantageous, so even very thin Workpieces 16, such as wires or the like, can be advantageously directed.

In order to properly feed the straightening roller assembly 1 the workpieces 16 to be straightened or removed from the straightening roller assembly I, the two-roller straightening machine 9 shown here comprises on the input side a known inlet guide 29 and on the output side a likewise known outlet guide 30. The inlet guide 29 and the outlet guide 30 are in this case adjustable so that the workpieces 16 can be supplied and discharged at the same height. Both the machine frame 8 and the inlet guide 29 and the outlet guide 30 are arranged in a suitable manner on a substrate 31 to each other and secured thereto.

LIST OF REFERENCE NUMBERS

1

Straightening roller arrangement

2

upper straightening roller

3

lower straightening roller

4

upper straightening roller axis

5

lower straightening roller axis

6

upper straightening roller chair

7

lower straightening roller chair

8th

machine frame

9

Two-roll straightening machine

10

top

11

lower part

12

tie rods

13

Horizontal axis of rotation

14

Main machine direction

15

Main direction of passage

16

workpiece

17

longitudinal axis

18

Angle α

19

Angle β

20

leveling gap

21

first leveling surface

22

second leveling surface

23

first generators

24

second generators

25

first turning point

26

second turning point

27

first turning point

28

second turning point

29

entry guide

30

Exit guide

31

underground

Claims (11)

To a roll axis (4, 5) rotating, for straightening to a longitudinal axis (17) rotationally symmetrical workpieces (16) certain straightening roller (2, 3) with a along the roll axis (4, 5) curved straightening surface (21, 22), which is defined by a correspondingly curved generatrix (23, 24), characterized in that the generatrix (23, 24) has at least one inflection point (25, 27). Straightening roll (2, 3) according to claim 1, characterized in that the generatrix (23, 24) has at least two turning points (25, 26, 27, 28). For straightening of a longitudinal axis (17) rotationally symmetrical workpieces (16) certain straightening roller assembly (1) with two superposed straightening rollers (2, 3), of which at least one straightening roller (2, 3) is designed according to one of the preceding claims. Straightening roller arrangement (1) according to claim 3, characterized in that both straightening rollers (2, 3) are designed according to one of claims 1 or 2. Straightening roller arrangement (1) according to claim 3 or 4, characterized in that the two straightening rollers (2, 3) are each arranged at an angle (18, 19) with respect to the main machine direction (14). For straightening of a longitudinal axis (17) rotationally symmetrical workpieces (16) certain straightening roller assembly (1) with two superposed straightening rollers (2, 3) forming a straightening gap (20) with a directional triangle, characterized in that the straightening gap (20) has at least two straightening triangles. Straightening roller arrangement (1) according to claim 6, characterized in that the two straightening triangles are aligned symmetrically. For straightening of a longitudinal axis (17) rotationally symmetrical workpieces (16) certain straightening roller assembly (1) with two superposed straightening rollers (2, 3), which form a curved straightening gap (20), characterized in that the straightening gap (20) at least one Turning point has. Straightening roller arrangement (1) according to claim 8, characterized in that the straightening gap (20) has at least two turning points. Two-roll straightening machine (9) characterized by a straightening roller arrangement (1) according to one of claims 3 to 9. Method for straightening workpieces (16) which are rotationally symmetrical with respect to a longitudinal axis (17), characterized in that the work piece (16) is guided through a straightening gap (20) formed by two leveling rolls (2, 3) arranged one above the other and guided in this directional gap (20) axial direction is guided at least by two different curved areas.

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