EP2602031B1 - Cone piercing mill for producing seamless tubes - Google Patents

Description

The invention relates to a conical cross rolling mill for producing seamless tubes, designed as Diescherwalzwerk with two arranged in an anchored on the foundation mill stand driven tapered rollers and two driven guide or Diescherscheiben.

A rolling mill of this kind is by the EP 1 151 808 B1 become known, there in a scaffold stand construction of modular units. To further development of the rolling mill to a Diescherwalzwerk the two tapered rollers are each provided on a Diescherscheibenschlitten Diescher- or guide discs, also called disk rollers assigned. These guide or Diescherscheiben close as quasi-rotating rulers the lateral roll gap between the upper and lower tapered roller. The rolling mill frame consists of two spaced apart portal frames, which are connected to a lower cross frame and above by means of a crosshead. The crosshead is displaceable for rolling removal and installation in guides between the portal frame.

The known two-roll cross-rolling mills with an upper and a lower tapered roller bring a complex, time-consuming roll change with it. Because it must first be moved laterally the crosshead, and then successively by crane to lift the tapered rollers from the rolling stand. The peripheral plant components do not allow any process on both sides of the framework or portal frame, so that a simultaneous roll change is not possible. Rather, it always happens one after the other, never parallel in time.

From the US 3,566,653 A For example, a rolling mill is known which has barrel rolls as work rolls. The barrel rollers are arranged folded against each other under a vertical spread angle.

The invention is therefore an object of the invention to provide a cone slanting mill of the type mentioned that allows in a simplified design in particular a quick installation and removal for changing the tapered rollers.

This object is achieved in that the tapered rollers are provided symmetrically to the roll axis horizontally at a spread angle to the rolling stock exit side adjacent to each other in the rolling mill, each with respect to the rolling axis parallel rolling stand side with a built-in window for receiving a chock of the tapered rollers and these rolling stand sides assigned Guide stands of Walzenanstellmittel the tapered rollers bearing, raised and lowered scaffold-side end caps is formed. To roll change no crosshead needs to be solved and moved, but both tapered rollers can change at the same time, namely pull out of their banners each orthogonal to the rolling axis to the outside. Because after the clearing of the roll stand sides by preferably opposing adjustment, ie lifting the one and lowering the other side frame end cover, which can be used in a simple manner hydraulic or pneumatic actuating cylinder, the unimpeded installation and removal of the tapered rollers is guaranteed. The roll change thus no longer requires a very time-consuming shifting or lifting or unfolding of the upper half of the frame, so that also improves the availability of the rolling mill by the inventively achieved, significantly shorter roll change times.

The present invention horizontally juxtaposed roller assembly also allows large roll expansion angle, which allows Umformtechnische advantages because, for example, larger pipe outside diameters are possible. In the known, superimposed roller arrangement are large spreading angle (> 20 °) because of the inevitable accompanying, increased height of the rolling mill drive not to realize.

According to an advantageous embodiment of the invention are orthogonal to the rolling axis, in alignment with the shopping star of the tapered roller chocks linear guides arranged thereon, movable tapered roller change units, such as change car or carriage provided. As a result, the automated, simultaneous change of the two tapered rollers is further favored.

Another advantageous embodiment of the invention provides in the rolling mill vertically, one above and one below, arranged Diescherscheibeneinheiten. This contributes to the fact that there is enough space for simultaneous roll change in the area of the hut corridor to the right and left of the rolling axis or next to the rolling stand.

Fig. 1

als Einzelheit eines Kegelschrägwalzwerkes in einer perspektivischen Gesamtansicht ein im Fundament verankertes, "nacktes" Walzgerüst;

Fig. 2

ein von der Walzgut-Austrittsseite her gesehenes Kegelschrägwalzwerk in der Betriebsposition; und

Fig. 3

das Kegelschrägwalzwerk der Fig. 2 mit beidseitig des Walzgerüsts mittels Wechseleinheiten herausgefahrenen Kegelwalzen.

Further features and details of the invention will become apparent from the claims and the following description of an embodiment of the invention shown in the drawings. Show it:

Fig. 1

as a detail of a cone slanting mill in a perspective overall view anchored in the foundation, "bare" mill stand;

Fig. 2

one seen from the Walzgut outlet side conical chopper in the operating position; and

Fig. 3

the cone slanting mill of Fig. 2 with tapered rollers moved out on both sides of the roll stand by means of exchangeable units.

An in Fig. 1 shown rolling stand 1 is on the bottom plates 2 in the foundation 3 (see also Fig. 2 and 3 ) attached. In relation to the rolling axis or - Center 4 both left and right side of the scaffold is a built-in window 5a, b formed for a be introduced from each scaffolding side tapered roller 6a, b.

The schematic Fig. 2 shows the rolling stand 1 converted to a cone slanting mill 7 from the rolling stock exit side and shows that in the operating position shown the two tapered rollers 6a, 6b mounted in chocks 8, with their drive connection means 9 in the drawing plane, are arranged horizontally next to each other, symmetrically to the rolling axis or center 4 under a large spread angle, ie diverging towards the outlet side of the rolling stock. Right and left of the rolling axis 4 are door frame-like guide post 10a, 10b mounted on the rolling mill 1. Each guide post 10a, 10b receives a roll stopper 11 for the tapered rollers 6a, 6b carrying rail-mounted end cover 12a, 12b. These can be raised or lowered via a lifting cylinder 13a, 13b arranged here above and below, in the door frame-like guide posts 10a, 10b. The conical cross rolling mill 7 is completed by an upper and a lower Diescherscheibeneinheit 14a, 14b with in these vertically arranged Diescherscheiben 15a, 15b (see. Fig. 3 ). Furthermore, the shows Fig. 2 the upper and lower Diescherscheibenantrieb 16 a and 16 b. The Diescherscheibeneinheiten 14a, 14b can be folded away by means of swivel cylinders 17a, 17b up or down of the rolling mill 1.

The Fig. 3 shows the cone slanting mill 7 in the change position of the tapered rollers 6a, 6b. For removal or roll change, the left-side lifting cylinder 13a has lowered the scaffold-side end cover 12a and the right-side lifting cylinder 13b has lifted the local scaffold-side end cover 12b, so that the left and right-hand access to the chocks 8 with the tapered rollers 6a, 6b for simultaneous and automatic retraction of tapered roller changing units 19a, 19b orthogonal to the rolling axis 4 in alignment with the Built-in star 5a, 5b (see. Fig. 1 ) extending linear guides 18 is ensured. In the illustrated position, wherein the drive train, not shown, have been uncoupled before for roll removal, are the tapered roller change units 19a, 19b with the recorded on their chocks 8 tapered rollers 6a, 6b on both sides away from the cone slanting mill 7 in a sufficient to replace the tapered rollers space The new tapered rollers are then also retracted at the same time back into the rolling stand 1 and locked there, so that after moving out of the tapered roller change units 19a, 19b and raising or lowering the scaffold-side end cover 12a or 12b, the cone slanting mill 7 is ready for operation.

LIST OF REFERENCE NUMBERS

1

rolling mill

2

foundation slab

3

foundation

4

Roll shaft / roll center

5a, b

installation window

6a, b

tapered roller

7

Cone piercing mill

8th

chock

9

Drive connection means

10a, b

door frame-style guide stand

11

Walzenanstellmittel

12a, b

Scaffolding side end cover

13a, b

lifting cylinder

14a, b

Diescherscheibeneinheit

15a, b

Diescher

16a, b

upper / lower die disc drive

17a, b

swing cylinders

18

linear guide

19a, b

Tapered roller exchange unit

Claims (4)

1. A crossrolling mill (7) with conical rolls for producing seamless pipes, namely in the form of a Diescher rolling mill with two driven conical rolls (6a, 6b) that are arranged in a roll stand (1) anchored on a foundation (3) and two driven guide discs or Diescher discs (15a, 15b),
   characterized in
   that the conical rolls (6a, 6b) are horizontally and adjacently arranged in the roll stand (1) symmetrically to the rolling axis (4) such that they diverge toward the rolling stock output side by an angle of spread, wherein each parallel roll stand side referred to the rolling axis (4) is realized with an installation window (5a, 5b) for accommodating a chock (8) of the conical rolls (6a, 6b) and lateral roll stand end covers (12a, 12b) that can be raised and lowered and carry guide columns (10a, 10b) of roll adjusting means (11) of the conical rolls (6a, 6b) assigned to these roll stand sides.
2. The crossrolling mill with conical rolls according to claim 1,
   characterized in
   that the lateral roll stand end covers (12a, 12b) can be adjusted contradirectionally.
3. The crossrolling mill with conical rolls according to claim 1 or 2,
   characterized by
   linear guides (18) that are arranged orthogonally to the rolling axis (4) in alignment with the installation windows (5a, 5b) for the chocks (8) of the conical rolls and feature displaceable roll changing units (19a, 19b) for the conical rolls arranged thereon.
4. The crossrolling mill with conical rolls according to one of claims 1 to 3,
   characterized by
   Diescher disc units (14a, 14b) that respectively are vertically arranged in the roll stand (1) on the top and on the bottom and feature Diescher discs (15a, 15b) arranged therein.

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