DE202022100813U1 - ring roller - Google Patents

Abstract

Annular roller (1), in particular a cold pilger roller, for rolling a tubular metallic rolling stock, comprising an annular roller body (2) on whose outer circumferential roller surface (3) a first caliber profile (4) and a second caliber profile (5) are arranged, characterized in that the the two caliber profiles (4, 5) on the outer circumferential surface (3) of the annular roller body (2) are arranged in opposite directions to one another.

Description

The present invention relates to a ring roll, in particular a cold pilger roll, for rolling a tubular metal rolling stock and a cold pilger rolling mill, comprising at least one ring roll according to the invention.

The ring rolls previously known from the prior art usually have only one caliber profile with a deformation zone that includes a specific usable circumferential angle, for example 150° or 280°. The forming zone is formed by a working and a smoothing pass. Depending on the process, such a ring roller also includes a rollover inlet area and a rollover outlet area.

The rollover entry area is the area in which the caliber profile of the ring roll detaches from the tubular metal rolling stock, in particular the pipe, in order to enable rotation and advancement of the tubular metal rolling stock in an inlet dead center of the roll stand.

The rollover run-out area, on the other hand, is the area in which the caliber profile detaches from the tubular metallic rolling stock, in particular the tube, in order to enable rotation and possibly advance before the roll stand reaches the dead center of the run-out. Large areas of the rollover run-out area are congruent with a so-called "transition". In this, the caliber profile must be opened so far that it does not touch the shell that has not yet been formed when the ring roller reaches the entry dead center position.

From the German Offenlegungsschrift DE 31 29 903 A1 discloses a method for producing pipes with external diameters that change in sections and, if necessary, internal diameters by reducing them by means of positively driven ring rollers rotatably mounted in a reciprocating rolling stand via a mandrel, the ring rollers used here having different calibers arranged one behind the other in the rolling direction to produce different outer diameters .

Furthermore, so-called 180° rolling dies are known, which allow a forming angle of up to 170°. Rolling dies have fundamental disadvantages in terms of operational and operator safety.

Furthermore, the ring roll diameter increases disproportionately with the size of the machine in relation to the roll stand stroke, so that increasingly less circumferential angle of the ring rolls can be used for the forming.

The object of the present invention is therefore to provide a ring roller that is improved compared to the prior art, in particular to provide a ring roller that has a larger usable circumferential angle than the prior art.

Description of the invention

According to the invention, the object is achieved by a ring roller, in particular a cold pilger roller, with the features of claim 1.

The ring roller according to the invention, in particular a cold pilger roller, which is suitable and/or intended for rolling a tubular metallic rolling stock, in particular for rolling metallic pipes, comprises an annular roller body on whose outer circumferential surface a first groove profile and a second groove profile are arranged. According to the invention, it is provided that the two caliber profiles provided for rolling the metal tubes are arranged opposite to one another on the outer circumferential surface of the roll of the ring-shaped roll body.

The two caliber profiles are thus arranged in mutually opposite directions of rotation on the ring roller, so that the first caliber profile extends clockwise from a first inlet dead center and the second caliber profile extends counterclockwise from a second inlet dead center. The distance between the two inlet dead centers is preferably less than 20° of the circumference of the ring roller, more preferably less than 15° of the circumference of the ring roller, and most preferably less than 10° of the circumference of the ring roller. The distance between the two inlet dead centers can also be 10° of the circumference of the ring roller.

Since each of the two caliber profiles includes a forming zone, the ring roller according to the invention has two forming zones, which can be configured identically or differently depending on the variant.

Since the processing time and the production costs of the ring rollers are largely independent of what portion of the circumference is actually used for the forming, the ring roller according to the invention allows twice the service life at the same costs. This has a particularly advantageous effect on large cold pilger rolling mills. Further advantageous refinements of the invention are specified in the dependently formulated claims. The features individually listed in the dependent claims are in technological can be combined with one another in a sensible manner and can define further refinements of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, with further preferred configurations of the invention being presented.

In the context of the present invention, the term “working caliber” is understood to mean the area of the ring roller with which the diameter and the wall of a metal pipe are reduced.

In contrast, the term “smooth pass” is understood in the sense of the present invention to mean the area of the ring roller with which remaining unevenness and/or waviness can be re-rolled and thus reduced.

Advantageously, the first and the second caliber profile each have at least one rollover entry area, at least one smoothing pass arranged behind it in the rolling direction, and at least one working pass arranged between the rollover entry area and the smoothing pass. In this context, it is preferably provided that the two rollover run-in areas overlap or penetrate each other, so that the forming zone formed jointly by the working pass and the smoothing pass of each pass profile can be formed with a larger ring roll circumference.

In order to prevent a tube rolled with one of the two caliber profiles from coming into contact with the other of the two caliber profiles in the respective discharge dead center, it is preferably provided that the smoothing caliber of one caliber profile is sufficiently far away from the discharge dead center of the other caliber profile, i.e. the the two smoothing calibers on the outer circumferential surface of the ring roller are spaced apart from one another on the circumferential side. In other words, the outlet dead center of the first caliber profile from the second smoothing caliber of the second caliber profile in the circumferential direction or the outlet dead center of the second caliber profile from the first smoothing caliber of the first caliber profile is arranged at a specific distance. The two forming zones formed by the respective working pass and smoothing pass are therefore arranged on the ring roller in such a way that they do not penetrate or overlap. The section of the circumference of the roller between the two smoothing calibers then forms the so-called rollover run-out area. In this embodiment variant, therefore, each of the two caliber profiles has at least one rollover run-out area arranged behind the respective smoothing caliber in the rolling direction.

Provision is particularly preferably made in this connection for the two rollover run-out areas to overlap or penetrate one another. This makes it possible to arrange two caliber profiles with a length of more than 180° on a single ring cylinder. Due to the mutually opposite direction of rotation of the two caliber profiles on the ring roller, the rollover inlet areas of which advantageously also penetrate each other, the rollover inlet area of the first caliber profile can assume the function of the rollover inlet area of the second caliber profile and vice versa.

Two identical caliber profiles or different caliber profiles for different deformations can thus be introduced on the ring roller according to the invention. Provision is preferably made for the two caliber profiles to be designed differently. The two caliber profiles can, for example, have forming zones of significantly different lengths, so that a long forming zone with a high production output can be provided for a reduction with a high order volume, and a short forming zone is used for a reduction required only in small production quantities.

For such reductions, the tool costs often represent an economically significant part of the cost.

In a further embodiment variant, the two caliber profiles can also share or use a common smoothing caliber, in which case a ring roller designed in this way then no longer has a rollover run-out area.

Furthermore, it is preferably provided that the ring-shaped roller body has at least one radially extending orientation groove on its two side surfaces, with the aid of which the respective ring roller can be arranged more easily on a roller shaft. This avoids an incorrect assignment "groove to profile" when mounting the ring roller on the roller shaft.

In order to use the other caliber profile, it is advantageously provided that the ring roller is first dismantled from a roller shaft, then rotated through 180° around an axis perpendicular to the axis of the bore in such a way that the orientation groove is aligned with a corresponding feather key on the roller shaft, and then the Ring roller is pushed onto the roller shaft.

In a further second aspect, the present invention also relates to a cold pilger rolling mill comprising the at least one ring roller according to the invention.

• - 120° ≤ Umformwinkel ≤ 165° (gleichbedeutend mit (2/3 × Ritzelteilkreisumfang) ≤ Umformlänge ≤ 165/180 × Ritzelteilkreisumfang), und/oder
• - Summe aus Überschlageinlaufbereich und Überschlagauslaufbereich ≥ 30°.

When designing the core parameters of the cold pilger rolling mill according to the invention, it is preferably provided that the stroke of the roll stand, ring roll diameter, pinion diameter and the length of the forming zone of the respective caliber profile meet the following conditions:

• - 120° ≤ forming angle ≤ 165° (equivalent to (2/3 × pinion pitch circle circumference) ≤ forming length ≤ 165/180 × pinion pitch circle circumference), and/or
• - Sum of rollover inlet area and rollover outlet area ≥ 30°.

In a further third aspect, the present invention also relates to the use of the ring roller according to the invention for the production of metal pipes.

• Wenn die Differenz zwischen größtmöglichem und kleinstmöglichem Walzendurchmesser mindestens so groß ist wie ein Modul eines antreibenden Ritzels, können zwei ähnliche Kaliberprofile für die gleiche Walzung in die Ringwalze eingebracht werden, ohne die Reibungsverhältnisse (sog. „Slipfaktor“) zu verändern. Die nachgearbeitete Ringwalze hat dann einen um das Maß des Ritzelmoduls verkleinerten Durchmesser und wird mit einem Ritzel kombiniert, das einen Zahn weniger aufweist, also ebenfalls um das Maß des Ritzelmoduls kleiner ist.

Further advantageous variants of the ring roller according to the invention are:

• If the difference between the largest possible and smallest possible roll diameter is at least as large as a module of a driving pinion, two similar caliber profiles can be introduced into the ring roll for the same rolling without changing the friction conditions (so-called "slip factor"). The reworked ring roller then has a diameter reduced by the size of the pinion module and is combined with a pinion that has one tooth less, i.e. is also smaller by the size of the pinion module.

In general, the ring rolls can be reduced at least once to a slightly smaller diameter and the same profile applied before changing to the next smaller sprocket.

1. a) mit einer neuen Ringwalze zwei Durchläufe wegen der zwei Kaliberprofile;
2. b) mit jeder Verringerung des Walzendurchmessers zwei weitere Durchläufe, weil wieder zwei Kaliberprofile eingebracht werden;
3. c) wenn der Slipfaktor zu klein wird, kann die Ringwalze im Außendurchmesser auf ein Maß gebracht werden, das dem ursprünglichen Außendurchmesser abzüglich dem Ritzelmodul entspricht, so dass anschließend wieder zwei Kaliberprofile, nun aber passend zu dem um einen Zahn verkleinerten Ritzel eingebracht werden können und zwei weitere Durchläufe ermöglicht werden;
4. d) auch mit einem kleineren Ritzel kann es möglich sein, den Walzendurchmesser ein- oder mehrfach zu reduzieren, bevor der Slipfaktor zu klein wird, so dass bei der Nacharbeit auf jeden kleineren Walzendurchmesser jeweils zwei Umformprofile eingebracht werden können;
5. e) sofern noch kleinere Ritzel zur Verfügung stehen und eine entsprechende weitere Verkleinerung des Walzendurchmessers möglich ist, kann eine weitere Schrittfolge startend bei c) erfolgen.

The ring rollers then have a multiple service life:

1. a) with a new ring roller, two passes because of the two caliber profiles;
2. b) with each reduction in the diameter of the roll, two further passes, because two caliber profiles are introduced again;
3. c) if the slip factor is too small, the outer diameter of the ring roller can be reduced to a size that corresponds to the original outer diameter minus the pinion module, so that two caliber profiles can then be introduced again, but now matching the pinion that has been reduced by one tooth and two more runs are enabled;
4. d) Even with a smaller pinion, it may be possible to reduce the roll diameter once or several times before the slip factor becomes too small, so that two forming profiles can be applied to each smaller roll diameter during reworking;
5. e) if even smaller pinions are available and a corresponding further reduction in the roll diameter is possible, a further sequence of steps can take place starting at c).

character list

• 1 eine Ausführungsvariante der erfindungsgemäßen Ringwalze, und
• 2 einen Teil eines Walzgerüstes mit einem eingebauten Paar der erfindungsgemäßen Ringwalzen.

The invention and the technical environment are explained in more detail below with reference to the figures. It should be pointed out that the invention should not be limited by the exemplary embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description and/or figures. In particular, it should be pointed out that the figures and in particular the proportions shown are only schematic. The same reference symbols designate the same objects, so that explanations from other figures can be used as a supplement if necessary. Show it:

• 1 an embodiment of the ring roller according to the invention, and
• 2 a part of a roll stand with a built-in pair of ring rolls according to the invention.

In 1 an embodiment of the ring roller 1 according to the invention is shown in a side view. The ring roller 1 shown here is formed from an annular metallic roller body 2, on whose outer roller peripheral surface 3 two caliber profiles 4, 5 are arranged, which each extend between an inlet dead center 6, 7 and an outlet dead center 8, 9 along the ring roller circumference.

The first caliber profile 4 extends clockwise from the first inlet dead center 6 to the first outlet dead center 8 and has a caliber length of 194.95°. The second caliber profile 5, on the other hand, extends counterclockwise from the second inlet dead center 7 to the second outlet dead center 9 and in the present case also has a caliber length of 194.95°. The distance between the two inlet dead centers 6, 7 is 10° of the ring roller circumference 3.

Each of the two caliber profiles 4, 5 is formed by a rollover inlet area 11, 12, a working caliber 13, 14, a smoothing caliber 15, 16 and a rollover outlet area 17, 18.

The first rollover run-in area 11, which has a caliber length of 18.36°, extends circumferentially between the first run-in dead center 6 and the first radial line 19. It is followed clockwise by the first working caliber 13, which extends accordingly from the first radial line 19 to the second radial line 20 and has a caliber length of 132.22°. The first smoothing caliber 15 then follows in a clockwise direction, which correspondingly extends from the second radial line 20 to the third radial line 21 and has a caliber length of 22.07°. Between the third radial line 21 and the first outlet dead center 8, the first caliber 4 has the first rollover outlet region 17, which has a caliber length of 22.30°.

The second rollover run-in area 12, which also has a caliber length of 18.36°, extends circumferentially between the second run-in dead center 7 and the fourth radial line 22. It is followed counterclockwise by the second working caliber 14, which extends accordingly from the fourth radial line 22 to the fifth Extends radial line 23 and has a caliber length of 132.22 °. This is followed by the second smoothing caliber 16, which correspondingly extends from the fifth radial line 23 to the sixth radial line 24 and has a caliber length of 22.07°. Between the sixth radial line 24 and the second outlet dead center 9, the second caliber 5 has the second rollover outlet region 18, which has a caliber length of 22.30°.

As shown in the illustration in 1 further recognizable, the ring roller 1 has a first and a second orientation groove 25, 26.

In the present case, the two rollover run-in regions 11, 12 penetrate each other by 10°. The start of the second working caliber 14 is only 8.36° away from the first orientation groove 25 in the embodiment variant shown here. As a result, the second working pass 14 of the second pass profile 5 can assume the function that the “transition” area has in conventional ring rolling for the first working pass 13 of the first pass profile 4 . If the first working caliber 13 is used for rolling, the first orientation groove 25 is at the top when the roll stand is at the first inlet dead center 6 . If the ring roller 1 then rolls from the first inlet dead center 6 clockwise in the direction of the first working caliber 13, the second orientation groove 26 comes up within the first rollover inlet area 11.

The two rollover outlet areas 17, 18 penetrate each other considerably in this variant, since the first outlet dead center 8 of the first caliber profile 4 is only 0.05° away from the end of the second smoothing caliber 16 of the second caliber profile 5 and vice versa.

Since each of the two caliber profiles 4, 5 has a caliber length of 194.95°, the ring roller 1 according to the invention therefore has a functional area with a total length of 389.9°, which is arranged on the outer circumferential surface 3 of the roller.

Reference List

1

ring roller

2

roller body

3

Circumferential surface of the roller / circumference of the ring roller

4

first caliber profile

5

second caliber profile

6

first inlet dead center

7

second inlet dead center

8th

first outlet dead center

9

second outlet dead center

10

Distance between the two inlet dead centers

11

first rollover run-in area

12

second rollover run-in area

13

first working caliber

14

second working caliber

15

first smooth caliber

16

second smoothing caliber

17

first rollover runout area

18

second rollover outlet area

19

first radial line

20

second radial line

21

third radial line

22

fourth radial line

23

fifth radial line

24

sixth radial line

25

first orientation groove

26

second orientation groove

27

mill stand

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 3129903 A1 [0005]

Claims (11)

Annular roller (1), in particular a cold pilger roller, for rolling a tubular metallic rolling stock, comprising an annular roller body (2) on whose outer circumferential roller surface (3) a first caliber profile (4) and a second caliber profile (5) are arranged, characterized in that the the two caliber profiles (4, 5) on the outer circumferential surface (3) of the annular roller body (2) are arranged in opposite directions to one another. Ring roller (1) after claim 1 , wherein the first and the second caliber profile (4, 5) each have at least one rollover run-in area (11, 12), at least one smoothing pass (15, 16) arranged behind it in the rolling direction and at least one smoothing pass between the rollover run-in area (11, 12) and the smoothing pass ( 15, 16) arranged working caliber (13, 14). Ring roller (1) after claim 2 , wherein both smoothing caliber (15, 16) are spaced from each other. Ring roller (1) after claim 2 or 3 , wherein the two rollover run-in areas (11, 12) overlap or interpenetrate. Ring roller (1) according to one of the preceding claims 2 until 4 , wherein each of the two caliber profiles (4, 5) has at least one rollover outlet region (17, 18) arranged behind the respective smoothing caliber (15, 16) in the rolling direction. Ring roller (1) after claim 5 , wherein the two rollover outlet areas (17, 18) overlap or interpenetrate. Ring roller (1) according to one of the preceding Claims 4 until 6 , wherein the overlap of the rollover outlet areas (17, 18) is greater than the overlap of the two rollover inlet areas (11, 12). Ring roller (1) according to one of the preceding claims, in which the two caliber profiles (4, 5) are designed differently. Ring roller (1) according to one of the preceding claims 2 until 8th , wherein the two caliber profiles (4, 5) have a common smoothing caliber. Ring roller (1) according to one of the preceding claims, in which the ring-shaped roller body (2) has at least one radially extending orientation groove (25, 26) on each of its two side surfaces. Cold pilger rolling mill comprising at least one ring roll (1) according to one of the preceding claims.

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