DE2438833A1 - METHOD AND DEVICE FOR ROLLING TUBULAR HOLLOW BODIES - Google Patents

Description

PATENT ADVOCATE? / Q ö Q Q q

WOLFGANG SCHÜLZ-DÖRLAM Z 4 J ö ö J J

INGENIEUR DIPLOME D-8000 MÜNCHEN 80 MAUERKIRCHERSTRASSE 31 TELEPHONE (089) 98 19 79

NIPPON KOKAN K.K. SOPO N 209 DI-

1-1-2, Marunouchi

Chiyoda-ku,
Tokyo (Japan)

Method and device for rolling tubular hollow bodies

The invention relates to a method of rolling of, in particular tubular, hollow bodies in a plug rolling mill arranged in a production line which the rolled hollow body passes through a first rolling pass, by means of a return roller arrangement to a the feed chute assigned to the plug rolling mill (inlet V table) conveyed back and before being fed to the plug mill for a second rolling pass by an angle of is rotated about 90 ° about its axis of rotation. It also relates to a device for carrying out this method,

In a plug rolling mill of the type described above, which is based on a Mannesmann plug rolling mill

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afterwards, two rolling passes are usually carried out. During the first rolling pass, there are two corresponding Roll caliber of a given size and a plug used and the hollow body rolled in this way is used for the second Rolling pass rotated by an angle of 90 °, using the same roller gauges for the second rolling pass and simply replace the plug with another one. In connection with the present invention the surface of the grooves in the two opposing work rolls of the plug mill are under roll gauges Understood.

In the known plug rolling mill, the lower of the two return rollers is a return roller arrangement arranged behind the plug rolling mill having two work rolls during the rolling process of the plug mill in its lowered position. When the first rolling pass has ended and the rolled hollow body is conveyed back to the bin bump for the second rolling pass the upper work roller of the plug mill and the lower return roller of the return roller assembly each lifted up by a lifting tool »Because of this, the rolled hollow body is between the both return rollers firmly gripped, so that when rotating the rolled hollow body is conveyed back to the feed chute of the plug rolling mill by the return rollers. However, since the roll gauges in the upper and lower work rolls of the plug mill each only over an angle of 120 ° are circular and the remaining angular ranges are widened to facilitate the rolling process, arise in these relief areas during the first rolling pass on both sides of the hollow body fin-like Rolling burrs, through which the wall thickness of the hollow body becomes uneven. It is therefore necessary

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to rotate the rolled hollow body through an angle of 90 ° before the second rolling pass begins, so that the fin-like portions of the rolled hollow body are rolled during the second rolling pass to to achieve a uniform wall thickness through the second rolling pass. The turning of such a rolled Hollow bodies have hitherto been made in various ways, in particular by hand, and additionally by mechanical means Drive as well as only by mechanical drive with electrical control ,, The known turning methods showed however, there are various disadvantages, above all that the turning of the hollow body involves additional effort was connected.

The present invention is based on the object of a simple and effective method and a device for rolling tubular hollow bodies of the type described at the outset, which are not have the disadvantages of the known devices.

According to the invention, this object is achieved in that the rolling of the hollow body is rotated by an angle of about 90 ° takes place during a return stroke, in which the rolled hollow body passes through the return roller arrangement is conveyed back to the entry channel.

Above all, the invention reduces the energy required and the duration of the rolling process the economy of rolling is improved.

Further features and advantages of the invention emerge from the following description of one in the drawing schematically illustrated embodiment. Show it:

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Figure 1 in plan view an overview a plug rolling mill according to the invention with a return roller arrangement and associated ! Tables,

FIG. 2 shows a front view of the return roller arrangement from FIG. 1, which has a pair of rollers, seen in the direction of arrows II,

Figure 3 is a schematic cross-sectional view

to illustrate the ax and manner in which the corresponding roller calibers the upper and lower return rollers of the return roller assembly are offset from one another,

FIG. 4 shows an axial longitudinal section through the non-driven longitudinal bearing area of the upper Return roller of the return roller assembly and

Figure 5 is an axial longitudinal section of the non-driven Longitudinal bearing area of the lower return roller of the return roller assembly.

According to Figure 1, in which the arrangement of a plug rolling mill 5, a return roller assembly 7 and a push-in chute (inlet V-table) 3 is shown by a Mannesmann plug rolling mill, not shown in the drawing Ejected workpiece transformed into a hollow body 1 on inclined slide rails 2, which while rolling down on this is moved forward. To The hollow body 1 slides into the insertion channel 3

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is this by a pusher 4 in its longitudinal direction moved forward and inserted between the upper and lower work rolls of the plug mill 5, after which the " Hollow body 1 the first rolling pass in the plug mill is subjected. During the first rolling pass, a lower return roller 9 becomes the return roller assembly held in the lower position, and after completion of the first rolling pass, the lower return roller 9 of the return roller assembly 7 raised so that the rolled hollow body is gripped by the upper 8 and lower 9 return rollers, which are then driven to the hollow body 1 by the upper and lower work roll of the plug rolling mill 5 to be ordered back through to the entry channel 3. In this return process, the hollow body 1 is not with the Plug rolling mill 5 brought into engagement, since its upper work roll is raised at this time. The rolled one The hollow body 1 is then pushed forward again through the pusher device 4 and with the plug rolling mill 5 engaged for the second continuous rolling process .

The inventive rotation of the hollow body 1 by 90 ° takes place during the return stroke, that is, when the rolled Hollow body 1 after passing through the first rolling pass is conveyed back to the push-in channel 3 by means of the return roller arrangement 7. According to Figure 2, the return roller assembly rotates 7 the rolled hollow body 1 during its return stroke automatically by 90 ° due to their special Construction, which has a non-driven longitudinal bearing area 1o at a shaft end of the upper return roller and a driven longitudinal bearing area 11 on their other end as well as a non-powered long-thrust blocking mechanism 12 of the lower return roller 9 to prevent movement of the roller 9 in its

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Axial direction includes. With the non-driven longitudinal bearing arrangement 4 is a shaft shaft 17 of the upper return roller 8 in a journal bearing 13 arranged, which is located in a bearing sleeve 14. The journal bearing 13 is designed as a needle bearing, whereby an axial movement of the shaft shaft 17 is made possible. A push-in plate 16 with a central threaded opening is arranged coaxially at the outer end of the bearing sleeve 14 and a push-in threaded bolt 13 with a Rotary core piece at one end and a flat head at its other end is in the threaded opening the pusher plate 16 screwed in such a way that the shaft shaft 17 and thus the upper return roller 8 by rotation of the flat head can be moved in the axial direction. Although this is not shown in the drawing the driven longitudinal bearing areas 11 and 6 also have needle bearings to allow axial movement of their associated Allow shaft shafts. According to FIG. 5, the shaft shaft of the lower return roller 9 is in axial bearings 18 and 19 of the Längssohub blocking mechanism 12 arranged to an Axialdruok in the direction of the shaft shaft lower return roller exert, and in this way an axial movement of the lower return roller 9 · Of course, it is possible to use the individual parts of the automatic mechanism described above for the rotation of the hollow body 1 with respect to the upper and lower return roller to be arranged in the opposite way, to get the same results.

If the push-in threaded bolt 8 is rotated so that the shaft shaft 17 of the upper return roller 8 is moved a little and the corresponding Caliber of the upper and lower rollers 8 and 9 of the return roller assembly 7 by a distance A (Figure 3)

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be shifted a little to each other, has an effect on the rolled one Hollow body 1 a torque that rotates it in a direction in which the peripheral speed is high, that is, clockwise in Figure 3. For this reason can be achieved by a suitable choice of the displacement distance (the displacement distance A. is in the range from 2 to 15 mm and preferably on the order of several millimeters) taking into account various factors such as the Diameter and the length of the pipe to be produced, the rolled hollow body, i.e. the pipe, which is just the went through the first rolling pass, during the return stroke be rotated to the insertion channel, so that the horizontal fin-like sections created by the rolling burr of the hollow body can be brought into the desired vertical arrangement. The following numerical example shows the results obtained by the method according to the invention:

(1) Dimensions of the pipe produced:

Outside diameter 139.7 mm, wall thickness 7.72 mm
Length 1o, 2 mm

(2) Dimensions after the first rolling pass through the plug mill according to the rolling plan

Outside diameter 14-7 mm
Wall thickness 7.9 mm
Length 1o, 2 mm

(3) Data of the return roller arrangement:

Outside roll diameter 5oo mm, caliber diameter 145 mm Roller speed 46o rpm. Shift of the upper return roller + 13 mm

(4) Results:

Pipe rotation angle 9o ° ± 2o ° Return speed 9.6 m / sec Rotation speed 47.4 / see return time 1.9 sec

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From the above numerical values it can be seen that the desired result was achieved »

While in the embodiment described above, the upper and lower return rollers 8 and 9 a little shifted or axially offset against each other in order to apply a torque to the rolled hollow body, For this purpose, the axes of rotation of the upper and lower return rollers 8 and 9 can also be indicated by the dash-dotted lines as in FIG Lines are indicated so that the axes of rotation are at small angles around the center the roller caliber cross through which the rolled hollow body is passed, so that a similar way Torque is exerted on the rolled hollow body. This crossing angle is advantageously <jC in the range between 1 and 5 °

For this reason it is also possible to use the rolled hollow body by slightly offsetting the calibres of the upper and lower return rollers 8 assigned to one another and 9 of the return roller assembly 7 against each other as in FIG the embodiment described above and by additionally adjusting the axes of rotation - the upper and lower Return rollers at small angles against each other around the To rotate the center of the roller caliber through which the rolled hollow body is passed.

From the above description it can thus be seen that according to the invention, the associated roller sizes of the upper and lower return rollers 8 and 9 of the return roller arrangement 7 can be offset to each other by an amount A or the axes of rotation of the upper and lower return rollers 8 and 9 can be arranged so that they let each other at small angles around the center of the

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Cross roller gauges through which the rolled hollow body is passed, or both of these methods are applied simultaneously, the duration of contact between the upper and lower return rollers 8 and 9 of the Return roller assembly 7 is controlled by means of a timer or the like to the rolled hollow body during its return stroke to the inlet side of the plug rolling mill to rotate automatically by a predetermined angular value. It is also possible to take additional measures such as enlarging the relief areas R (Figure 3) in each of the corresponding upper and lower return roll gauges to to achieve a smooth automatic turning of the rolled hollow body, or an enlargement of the relief area except for about half of each of the corresponding upper and lower return pulley calibers, so that the fin-like Sections of the rolled hollow body in no way hinder the automatic rotation of the rolled hollow body. In this way, great advantages result from the present invention, especially the fact that it is only by simply changing the known arrangement, the energy required for rolling pipes is possible to reduce, whereby the invention has a particularly large industrial usefulness.

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Claims (1)

WOLFGANG SÜHÜLZ-DÖRLAM ENGINEERING DIPLOMAS D-8000 MUNICH 80 MAUERKIRCHERSTRASSE 31 TELEPHONE (089) 98 19 79 NIPPON KOKiN K.K. SOPO N 209 DT 1-1-2, Marunouchi Ohiyoda-ku,
Tokyo (Japan) Claims Method for rolling, in particular tubular, hollow bodies in a system arranged in a production line Plug rolling mill, in which the rolled hollow body passes through a first rolling pass, by means of a return roller assembly to one of the plug mill assigned push-in channel (inlet V-table) transported back and before being fed to the plug mill to a second rolling pass at an angle of about Is rotated 90 ° about its axis of rotation, characterized in that the rotation of the rolled hollow body takes place at an angle of about 90 ° during a return stroke, in which the rolled hollow body conveyed back to the push-in chute by the return roller assembly will. Device for carrying out the method according to claim 1, characterized in that the one another corresponding roller caliber of the upper and lower return rollers (8, 9) of the return roller arrangement (7) in the axial longitudinal direction of the return rollers (8, 9) - 2 50981 1/0717 ^ m ^ etc. are so slightly offset from each other that the rolled hollow body (1) "when passing through the a torque is given to corresponding roller calibres « 3. Apparatus for performing the method according to claim 1, characterized in that the longitudinal axes the upper and lower return rollers (8, 9) move into Top view seen in the center of the corresponding roller gauges through which the rolled hollow body (1) is passed through, cross in such a way that the rolled hollow body (1) when passing through the A torque is given to the roller caliber, 4. Apparatus for performing the method according to claim 1, characterized in that the roller caliber the upper and lower return rollers (8, 9) ia. more axial The longitudinal direction are so slightly offset from one another and the axes of rotation of the upper and lower return rollers (8, 9) seen in plan view in the center of the corresponding roller caliber through which the rolled hollow body (1) is passed through, cross in such a way that the rolled hollow body (1) when passing through a torque is given by the roller caliber. 5. Apparatus according to claim 2, characterized in that the lower return roller (9) is fixed and the upper return roller (8) is offset in its axial longitudinal direction. 6. Apparatus according to claim 2, characterized in that the upper return roller (8) stands and the lower return roller (9) is offset in its axial longitudinal direction. 50981 1/0717