JPS62110805A - Rolling mill, more particularly continuous rolling mill for pipe - Google Patents

Abstract

PURPOSE:To simplify a continuous rolling mill for pipes and to obtain high stability by using paired beams to form the supporting parts of assemblies for supporting grooved rolls, coupling the respectively adjacent paired beams and both ends to constitute a box type holding construction and press-tightening the adjacent assemblies to the assemblies between the paired beams. CONSTITUTION:The supporting parts for the assemblies 5 to support the plural grooved rolls 9 between both end plates 2 and 3 on a foundation plate 1 are constituted of the paired beams 6, 7 parallel with the axial lines of the rolls. Said part are then coupled by means of tightening bars 8 at both ends to the paired beams 7 or 6 which are continuous with the paired beams 6, 7 and are disposed to swivel by 90 deg. each therefrom to form the box type holding construction for the purpose of the assemblies 5. The assemblies 5 disposed between the paired beams 6 and 7 are press-tightened to the assemblies 5 of the adjacent paired beams 7 or 6 to impart the required rigidity to the entire device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill, and more particularly, has groove rolls arranged one after the other in the rolling direction, and each pair of groove rolls is supported on an assembled body with a 90 degree offset from each other. The present invention relates to a continuous tube rolling mill in which these assemblies are adjustable relative to fixed support parts for changing the roll profile.

Continuous tube rolling mills are known that have a seven or three-stand arrangement of double roll stands that are offset by 9'0 degrees one after the other. This rolling mill has stands that are arranged horizontally and vertically, or
It is built on an inclination of tj degrees and is combined with a tension drawing mill that serves as a finishing line to form a high-efficiency device for manufacturing seamless pipes. The spacing (pitch) of the roll stands is directly related to the required length of the mandrel, and care should be taken to keep it as small as possible. In the known continuous pipe rolling mill,
The roll stand has a 6f'Jt.
? It is manufactured in four pieces and has a housing in which the rolls are supported on cast steel assemblies. The upper and lower assemblies are adjustable relative to the crossbeams of the stand housing for roll-hole adjustment. The roll stands are assembled on a common one-stand frame and can be secured there with a hydraulically actuated device of corresponding construction.

The assembly of the stands in which the inserts are slidably supported and the arrangement of these stands on a common stand frame requires corresponding spacing of both the stands and the inserts. Furthermore, the stand must have a size that can reliably absorb the force acting in the rolling direction and its reaction force. The resulting tube rolling blocks are therefore expensive due to the required stability and, due to their construction, are longer than the minimum possible length given the roll diameter.

Starting from the above-mentioned continuous tube rolling mill, the present invention aims to reduce the distance between groove rolls arranged one after the other as narrow as possible.
The goal is to create a compact and stable rolling mill that reduces construction costs and weight, and substantially reduces the required floor space.

In order to solve this problem, the present invention provides supporting parts with paired beams parallel to each other and the roll@line, and these paired beams are arranged in pairs adjacent to each other and rotated by 90 degrees in parallel planes. joining the beams at both ends to form a box-shaped retaining structure for the embeddings, and clamping the embeddings placed between each pair of beams against the embeddings of the adjacent beam pair; propose.

That is, the proposed rolling mill uses the twin beams of the present invention instead of the conventional stands arranged separately one after the other, and the twin beams are arranged on both the upper and lower sides of a compact self-contained stand frame. It can be roughly compared to a horizontal beam. In order to absorb the rolling force acting in a direction perpendicular to the paired beams, the system of the present invention uses paired beams of adjacent rolls, and tension is applied to the paired beams. In this way, a box-shaped stand is created which is itself very stable and yet has an extremely space-saving construction. The spaces between the pair of beams are open for the transmission or for taking out the built-in parts, eliminating the need to remove the stand as in the past. Since each assembly abuts and is pressed against the adjacent assembly, the spacing between the miso rolls is considerably reduced and is largely determined by the diameter of the rolls. Since the assembled bodies are pressed together, the reaction forces in the rolling direction during rolling are evenly accommodated, and the pair of beams only need to accept forces perpendicular to the rolling direction.

An excellent feature of the present invention is that the pair of beams with built-in bodies are arranged between the front and rear end plates fixed to the base plate to form one block stand, and the pair of beams with built-in bodies are arranged between the front and rear end plates fixed to the base plate to form one block stand. Posture is fixed. In this way, the box-shaped holding structure establishes its space configuration and at the same time both end plates assume the role of adjacent pair beams for the first and last pair of miso rolls.

In particular, the twin beams are tightly clamped between the end plates via tension members to provide the necessary rigidity to the entire device.

As an important feature, it is proposed that the assembled bodies be closely juxtaposed to one another and pressed by a hydraulic piston-cylinder unit at least in a direction opposite to the rolling direction. In this way, not only can a minimum distance be maintained between the miso rolls, but also the tightening of the assembled bodies in the rolling direction prevents the assembled bodies from separating from each other due to rolling force in the axial direction.

Another characteristic of the invention is that the assembly of each pair of beams can be slid parallel to the pair of beams after the clamping is released. If the tightening of the assembled body is released,
The assembly can be easily pulled out laterally through the opening between the pair of beams, for example by means of corresponding automated equipment.

According to another feature of the invention, the assembly is slidably guided in the closed state along the adjacent pair of beams or end plates, it being understood that the guide can be adjusted by means of the assembly of the groove roll. It is not allowed to obstruct. The guide is released when the assembled body is removed. Of course, make sure that the joint with the adjustment mechanism of the built-in body can be cut.

Finally, in order to prevent the box-shaped holding structure from deflecting, it is proposed that at least the pair of beams in the middle of the block stand be supported by a foundation rigid frame.

An embodiment of the present invention shown in the accompanying drawings will be described below.

FIG. 1 schematically shows a rolling mill according to the invention from the side. Miso rolls (multiple) are placed on the base plate 1 on both front and rear end plates 2
, 3, and each transmission joint is designated by the reference numeral 4. The support part for the assembly 5 is in each case made up of a pair of beams 6.7, which are inclined at 1lti with respect to the horizontal and are connected to the adjacent pair of beams 6 or 7.
It is arranged in a direction rotated by 5;'θ degrees.

FIG. 1 shows the arrangement of the pair of beams 6.7. Here, the pair of beams 7 lies in a plane parallel to the pair of beams 6, and at the end of each pair of beams, means are provided, as indicated by reference numeral 8, for coupling these pairs of beams together. As a means of this,
As seen in Figures 1 and 3, the tension members or clamps are passed through corresponding holes or bushings in the ends of the paired beams and both end plates 2 and 6 to clamp the paired beams between the end plates 2 and 3. Bar 8
can be used.

The so-called "stacked" pairs of beams in this way form a box-shaped holding structure for the installations 5 and groove rolls 9, each associated in pairs with a pair of beams 6 or 7.

As can be seen in Fig. 3 when viewed from the direction of Fig. 2, the built-in body 5
are each closely juxtaposed with an adjacent assembly in the rolling direction and are supported therein in the rolling direction or in the opposite direction. These assemblies are equipped with known adjusting devices 10, which can be slid perpendicular to the rolling direction for groove adjustment.

The adjustment device 100 is connected to the assembly 5 via a positive joint 11, which allows the assembly to move parallel to the pair of beams 6 or 7.

As can be seen in FIG. 1, the end plate 6 is provided with piston-cylinder units 12 which act on the inserts 5 and press them together during the rolling operation. When removing the assembled body, the piston cylinder unit 12 is deenergized so that the assembled body can be moved in the removal direction.

Figure 3 shows cross section 1-I in Figure 3. As can be seen from this figure, the built-in body 5 has a groove 14 with a shape corresponding to the protrusion 13.
The groove 14 is fitted in the guide groove 14 and is guided along the beam of the pair beam 6'' or 7.As shown in Fig. This makes it possible to take out the body 5. For this purpose, the projection 13 is given a dimension that allows it to pass through the cut in the slide at the removal position.

FIG. 3 shows a roll arrangement, i.e., an assembly 5 with assembled grooved rolls 9, as well as two sets of unit devices arranged one after the other, offset from each other by 0 degrees. Equivalent parts have the same symbols.

According to the invention, a very compact and short-built rolling mill is obtained, the advantage of which is that the assemblies 5 are juxtaposed in direct contact with each other and the roll stands are in the form of twin beams 6.7 according to the invention. The adjacent pair beams 6 and 7 are connected to form one composite force structure. That is,
Conventional roll stands with crossbeams and stringers are no longer used, there are simply crossbeams consisting of paired beams, the stringers being in the form of crossbeams of adjacent miso roll pairs. Here, the dimension of the pair beam in the rolling direction corresponds to the width of the assembled body, and the position and orientation of the pair beam is determined by the arrangement of holes through which the tension member 8 is passed, which is made in the end plates 2 and 3. It is inserted through these holes and supported.

The reaction force generated from the rolling force is reliably received by the assembled bodies 5 which are adjacent to each other and pressed by the piston cylinder unit 12, so this rolling mill has high stability despite its simplified configuration. present.

Roll replacement is simplified because there are no side beams in the conventional roll stand, and the sides of the assembled body are open, allowing the assembled body to be taken out parallel to the pair of beams 6.7. This operation consists of a box-shaped holding structure consisting of a pair of interconnected beams 6.7! Well, it can be done by an automatic extraction device.

[Brief explanation of drawings]

Among the accompanying drawings showing embodiments of the present invention, FIG. 1 is a side view schematically showing a rolling mill according to the present invention, FIG. 2 is a cross-sectional view immediately after the cover plate of the rolling mill shown in FIG. 1, and FIG. 1 is a cross-sectional view of a part of the rolling mill seen in the direction of the arrow in FIG. 2, FIG.
FIG. 4, which is a sectional view excluding the built-in roll device according to (1), shows the built-in roll device. 2.6: Front end plate (cover plate) and rear end plate, 4 Transmission joint, 5:
Incorporated body, 6,7. Paired beam, 8: Tension member (tightening with rod)
, 9: Miso roll, 10, 11: Adjustment device toso joint,
12: Piston cylinder unit, 14: Guide miso. Patent applicant Mitsubishi Heavy Industries, Ltd. sub-agent Patent attorney Sei Motomei

Claims (1)

[Claims] 1. The groove rolls are arranged one after the other in the rolling direction, and each pair of the groove rolls is supported by an assembled body with a 90 degree deviation from each other, and these assembled bodies are arranged in a roll hole. In a rolling mill, especially a continuous tube rolling mill, which is adjustable relative to a fixed support part for type changes, said support parts are paired beams (6, 7) parallel to each other and to the roll axis; The pair of beams are connected at both ends (8) to a pair of beams (7 or 6) arranged adjacent to each other and rotated by 90 degrees in parallel planes to form a box-shaped holding structure for the built-in body (5). rolling, characterized in that the built-in bodies (5) arranged between each pair of beams (6, 7) are pressed against the built-in bodies of the adjacent pair of beams (7 or 6); Machine. 2. The paired beams (6, 7) with built-in bodies (5) are arranged between the front and rear end plates (2, 3) fixed to the base plate to form one block stand. , 7) whose postures are fixed between the end plates (2, 3). 3. The paired beams (6, 7) are tightly clamped between the end plates (2, 3) via the tension member (8);
A rolling mill according to claim 1 or 2. 4. Claim 1, characterized in that the assembled bodies (5) are closely juxtaposed to each other and are pressed by a hydraulic piston cylinder unit (12) at least in a direction opposite to the rolling direction.
The rolling mill described in section. 5. Claim 1, characterized in that the assembled body (5) of each pair of beams (6, 7) is slidable in parallel with the pair of beams (6, 7) after the clamping is released. The rolling mill according to item 1 or 4. 6. When the built-in body (5) is closed, the adjacent paired beams (6,
7) The rolling mill according to claim 1, 4 or 5, characterized in that it is slidably guided along the end plates (2, 3). 7. The rolling mill according to claim 2, wherein at least the middle pair of beams of the block stand are supported by a foundation rigid frame.