JP2010521317A - Method and apparatus for rolling a rolled material with a rolling apparatus equipped with an inclined roll mill - Google Patents

Abstract

The invention relates to a rolling mill for rolling stock to be rolled (6), having a planetary cross-rolling mill (20) and a subsequent further rolling mill in the rolling direction, the subsequent mill comprising a mandrel rod (10) having a length that is larger than the distance between the planetary cross-rolling mill (20) and the further rolling mill in the rolling direction.

Description

  The present invention relates to a method and an apparatus for rolling a rolled material, equipped with an inclined roll mill, and claims the priority of German Patent Application No. 102007014099.9.

  A rolling device equipped with an inclined roll mill is used, for example, for rolling a seamless metal tube or other rolling material having a circular cross section, such as a bar.

  In an inclined roll mill, a plurality of rolls are arranged on the outer peripheral surface of a rolling material to be rolled. The rolled material is rotated between a plurality of rolls rotating at the same rotational speed, and is formed at this time. In order to obtain the motion of the rolled material in the longitudinal direction, the plurality of rolls are inclined at a predetermined angle with respect to the longitudinal axis of the rolled material in a tangential plane. Such an arrangement is suitable for the spiral movement of the rolled material.

  The above-described structure of the inclined rolling apparatus has a series of drawbacks, in particular based on the rotational movement of the rolled material about its longitudinal axis. These drawbacks are in particular the maximum rolling stock length limitation, expensive bearing devices, guide devices and low drawing speeds. The quality of the rolled material is adversely affected by the rotation of the rolled material.

  Based on the above drawbacks, planetary inclined roll rolling mills have been developed. This planetary inclined roll mill can perform rolling without rotating the rolling material about its inherent longitudinal axis by superimposing the rotational motions of a plurality of structural groups. German Patent No. 19510715 describes such a planetary tilt roll mill. The device disclosed in the German Patent No. 19510715 has a rotor that performs a moving movement via a main drive, which surrounds the rolling stock and has four planets in the rotor. The rolls are rotatably supported so that these planetary rolls rotate with the rotor. Besides the movement rotating with the rotor, the planetary roll is driven to rotate about its longitudinal axis by an auxiliary drive.

  In order to continue the forming process initiated by the planetary inclined roll mill, another rolling mill is often provided following the planetary inclined roll mill. For example, a longitudinal rolling mill or another planetary tilt roll mill can be placed after.

  The subject of this invention is providing the method and apparatus which can avoid the above faults and can perform an effective rolling.

  This problem has been solved according to the invention by the means described in the independent claims. Advantageous embodiments are described in the dependent claims.

  The basic idea of the present invention is that mandrel rods are rolled into a planetary inclined roll mill at the same time (within a certain length of time) at the same time in a subsequent rolling mill. It is in the point of rolling above. The length of the mandrel rod according to the invention is greater than the distance between the planetary inclined roll mill and the other mill as viewed in the rolling direction, in particular the hollow block length (Hohlblocklaenge). That is, the mandrel rod is such that when the tube coming out of the planetary inclined roll mill reaches at least one roll set (one set of rolls) of the subsequent rolling mill, it engages with this roll set. It has a length. The mandrel rod engages the rolling mill when the tube wall thickness is reduced by the rolling mill rolling along the mandrel rod.

  According to the present invention, the forming can be carried out in a particularly well-distributed manner in the two rolling mills. For this reason, the planetary inclined roll mill is used for rolling intermediate products with low accuracy requirements. Accurate finish rolling is performed in a subsequent rolling mill. Thereby, it is also possible to rarely perform roll exchange in the planetary inclined roll rolling mill. The wall thickness of the rolled material can be adjusted to a desired thickness by a subsequent rolling mill without remodeling. Also, for planetary tilt roll mills, it is only necessary to provide individual defined mandrel rod diameters, and the rolling material is simply deformed to the respective cross section of the mandrel rod by a separate mill. It's okay. This can reduce the number of mandrel rods that the operator needs to prepare. In addition, the number of mandrel rod replacements is also reduced, thereby shortening the working time. Furthermore, since the drawing of the rolling material is performed separately in the two rolling mills, a higher rolling speed can be obtained in the finish rolling mill.

  According to the present invention, in the rolling apparatus for rolling a rolling material, comprising the planetary inclined roll rolling mill and another rolling mill following the planetary inclined roll rolling mill in the rolling direction, the planetary inclined A mandrel rod having a length larger than the distance in the rolling direction between the roll rolling mill and the other rolling mill, particularly a length larger than the hollow block length, is provided. The spacing in the rolling direction between a planetary inclined roll mill and another rolling mill refers to the planetary inclined roll mill, in which the rolling material is finally engaged with the roll of the planetary inclined roll mill. The distance between the location and the location where the rolling stock first engages with the first (first) roller of another rolling mill.

  Based on the length of the mandrel rod as described above, while the mandrel rod is inserted into the rolling material, the rolling material is inserted into the rolling gap of the planetary inclined roll rolling mill or the rolling gap of another rolling mill. It also comes to exist within.

  According to an advantageous embodiment of the invention, a holder for a mandrel rod is provided, which holder is at least partially at the same time as the mandrel rod penetrates into the rolling gap of the planetary tilt roll mill. The mandrel rod is held at a position where it enters the rolling gap of the another rolling mill. According to an advantageous embodiment of the invention, the holder is provided on the opposite side of the planetary tilt roll mill from the further rolling mill. According to an advantageous embodiment, a linear drive for linear movement of the holder of the mandrel rod is provided. As a result, the mandrel rod is pulled back to receive the rolling material, and then the mandrel rod penetrates into the rolling gap of the planetary inclined roll mill and at the same time enters at least partially into the rolling gap of another rolling mill. Can bring in.

  According to an advantageous embodiment, a longitudinal rolling device is arranged in the rolling direction following the planetary inclined roll mill. In this case, as the longitudinal rolling device, in particular, a plurality of rolls as described below, that is, a rolling device provided with a plurality of rolls whose axes are parallel to each other and / or arranged perpendicular to the rolling direction, respectively. Can be considered.

  According to an advantageous embodiment, the mandrel rod consists of a plurality of parts. The mandrel rods have different diameters according to an advantageous embodiment. If the mandrel rod is composed of multiple parts, the diameter changeover of the mandrel rod can be accomplished by removing the smaller section of the mandrel rod and securing the slightly larger diameter mandrel rod section to the rest of the mandrel rod. Easy adjustment along the longitudinal axis.

  According to an advantageous embodiment, a measuring device for regulating the rotation of the rolling material is arranged between another rolling device and the planetary inclined roll mill. In particular, if the other rolling mill is a longitudinal rolling mill capable of rolling without substantially rotating the rolling material, it is advantageous to provide a control device for a planetary inclined roll rolling mill. The control device for the planetary inclined roll rolling mill controls the driving of the planetary inclined roll rolling mill based on the measurement by the measuring device so that the rolling material does not rotate. A specific structure of an apparatus for carrying out this type of control and a specific method for such control are disclosed in German Offenlegungsschrift 103 490 56.

  According to an advantageous embodiment, a main drive for rotating the rotor surrounding the rolling stock and a planetary roll rotatably supported in the rotor are provided. Further, the planetary type inclined roll rolling mill has an auxiliary drive device for rotating the planetary roll about its longitudinal axis. An advantageous configuration of the planetary tilt roll mill is also described in the German patent 19510715. The planetary inclined roll mill has in an advantageous manner three or more planet rolls, in particular four planet rolls.

  According to the method for rolling a rolling material in a rolling apparatus comprising the planetary inclined roll rolling mill of the present invention and another rolling mill following the planetary inclined roll rolling mill in the rolling direction, the rolling The material was present in the rolling gap of the planetary inclined roll mill and in the rolling gap of the other rolling mill during a predetermined time interval during rolling. Advantageously, the rolling stock is located in the rolling gap of the planetary tilt roll mill and in the rolling gap of another rolling mill for the majority of the rolling operation. Advantageously, the rolling stock is present only in the rolling gap of the planetary inclined roll mill or in the roll gap of another mill during the necessary start-up and end phases.

  While the rolling material is present in the rolling gap of the planetary inclined roll mill and also in the rolling gap of the other rolling mill, a mandrel rod is inserted into the rolling material, and the mandrel rod Is made larger than the distance between the planetary inclined roll rolling mill and the other rolling mill in the rolling direction.

  The method according to the invention is used in an advantageous manner for rolling a tubular rolled material into a so-called Luppe. The rolled material is advantageously a metal, but it can also be other materials such as plastic.

1 is a schematic side view of a rolling apparatus according to the present invention having a rolling material to be rolled, a planetary inclined roll rolling mill and a longitudinal rolling mill. It is a schematic side view in the rolled state of the rolling apparatus shown in FIG.

  The present invention will be described in detail below with reference to illustrated embodiments.

  FIG. 1 shows a rolling apparatus comprising a planetary inclined roll rolling mill 20, a longitudinal rolling mill 25, and a measuring device 8 arranged between the planetary inclined rolling mill 20 and the longitudinal rolling mill 25. It is shown. The mandrel rod 10 is held in the holder 11. The linear drive device 12 moves linearly (in a line) within the holder 11. As shown in FIG. 1, the mandrel rod 10 has a length that is greater than the spacing between the planetary inclined roll mill 20 and the longitudinal mill 25. The rolling material 6 is rolled on the mandrel rod both in the planetary inclined gear device 20 and in the longitudinal rolling device 25.

  The planetary inclined roll rolling machine 20 is composed of a plurality of planetary rolls 1, and the lower side rolls of these planetary rolls 1 roll on the rolling material 6. In this case, the planetary roll 1 is inclined in both a vertical plane and a horizontal plane with reference to the longitudinal axis of the rolling material 6.

  The planetary roll 1 has a rear end portion rotatably supported in the rotor 2, and the rotation axis of the rotor 2 coincides with the longitudinal axis of the rolling material. The rotor 2 is driven by the driven shaft 3 of the main drive device via the transmission. The rotor 2 and the planetary roller 1 supported by the rotor 2 perform a rotational motion around the rolling material 6.

  Further, the planetary roll 1 is provided with gears 4, and these gears 4 mesh with the sun gear 5. As the gear 4 and the sun gear 5 mesh with each other, the planetary roller 1 performs one rotation around the unique axis based on the rotation of the rotor 2.

  The sun gear 5 is driven by a driven shaft 7 of a superimposed drive device (auxiliary drive device). The rotational movement of the sun gear 5 causes the rotational movement of the planetary roll 1 to be superimposed. The superposed rotational movement of the planetary roll 1 consists of the sum of the two rotational movements.

By superimposing the rotational motion of the planetary roll 1 and the rotational motion of the rotor 2, rolling can be performed without rotating the rolling material 6. The ratio of the rotational speed of the rotor 2 and the rotation of the planetary roll 1 required for this is a parameter that changes during the rolling stage (for example, partial changes in material properties of the rolled material, temperature fluctuations, roll scale deposition, Or changes in surface friction value). A measuring device 8 is arranged at the exit of the inclined roll mill, and this measuring device 8 detects the rotational motion N _Rohr of the rolling material 6 caused by the change in the parameters and sends it to a computer, The driving of the planetary inclined roll mill 20 is controlled so that the rotation of the tube is avoided.

  FIG. 2 shows a so-called “rolled” state in which the mandrel rod 10 protrudes from the end of the longitudinal rolling mill 25.

Claims (8)

In a rolling apparatus for rolling a rolling material (6), comprising a planetary inclined roll mill (20) and another rolling mill following the planetary inclined roll mill (20) in the rolling direction,
A mandrel rod (10) is provided, and the length of the mandrel rod (10) is larger than the distance between the planetary inclined roll mill (20) and the other rolling mill in the rolling direction. A rolling device for rolling a rolled material with a rolling device equipped with an inclined roll mill.   A holder (11) for the mandrel rod (10) is provided, and when the mandrel rod (10) enters the rolling gap of the planetary inclined roll mill (20), the holder (11) is inserted. At the same time, the rolling device according to claim 1, wherein the mandrel rod (10) is held at a position at least partially entering the rolling gap of the further rolling mill.   The rolling device according to claim 2, wherein a linear drive device (12) for linearly moving the holder (11) of the mandrel rod (10) is provided.   The rolling device according to any one of claims 1 to 3, wherein a longitudinal rolling mill (25) is arranged in the rolling direction following the planetary inclined roll rolling mill (20).   The rolling device according to any one of claims 1 to 4, wherein the mandrel rod (10) comprises a plurality of portions.   A measuring device (8) for measuring the rotation of the rolling material (6) is disposed between the another rolling mill and the planetary inclined roll rolling mill (20). The rolling apparatus according to any one of the above.   A main drive for rotating the rotor (2) surrounding the rolling material (6), a planetary roll (1) rotatably supported in the rotor (2), and the planetary roll (1) in its longitudinal direction The rolling device according to any one of claims 1 to 6, further comprising an auxiliary drive device for rotating about a direction axis. In a method for rolling a rolling material (6) in a rolling apparatus comprising a planetary inclined roll mill (20) and another rolling mill following the planetary inclined roll mill (20) in the rolling direction. ,
The rolling material (6) is present in a rolling gap of the planetary inclined roll mill (20) and in a rolling gap of the other rolling mill during a predetermined time interval during rolling. While the rolling material is present in the rolling gap of the planetary inclined roll mill (20) and also in the rolling gap of the other rolling mill, the mandrel rod (10) is inserted into the rolling material ( 6) It is inserted, and the length of the mandrel rod (10) is made larger than the interval between the planetary inclined roll rolling mill (20) and the other rolling mill in the rolling direction. The method for rolling a rolling raw material with the rolling apparatus provided with the inclined roll rolling mill.

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