JPH04288907A - Universal rolling mill - Google Patents

Abstract

PURPOSE:To execute the roll change in a short time and to easily and quickly execute the zero point adjustment by adjusting the position of the upper and lower horizontal roll chocks with the jack, and clamping the vertical roll chock with the upper and lower horizontal roll chock. CONSTITUTION:The jack 33 which adjusts the positional relation with the vertical roll 12 is set at the upper and lower horizontal roll chocks 10, 11, and the upper and lower rolls are set precisely divided. By using the screw shaft 20, and laminating the upper and lower horizontal rolls 23 and the vertical roll 4 in the roll kiss state, these are fastened with the fastening rod 30 of the fastening device 3, 4. By enlarging the interval of the hydraulic cylinder 31 and the fastening nut 32 over than the dimension of the lamination, each roll 2, 34 is inserted from the side, the hydraulic cylinder 31 is pressurized, the three high rolls assembly is attached in the stand 5.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a universal rolling mill for H-section steel hot rolling equipment, which allows roll changes to be made in a short time and zero point adjustment to be performed quickly, easily, and accurately. This relates to a yoke type universal rolling mill.

0002

[Prior Art] In a conventional open yoke universal rolling mill, a lower horizontal roll chock assembly, left and right vertical roll chock assemblies, and an upper horizontal roll chock assembly are sequentially stacked off-line, and then transferred to an online stand in a three-tiered state. Inserted. Then, using the lower horizontal roll lowering device, the left and right vertical roll lowering devices, and the upper horizontal roll lowering device online, the operator checked the roll kiss condition of each roll and performed zero point adjustment work.

This conventional zero point adjustment work will be explained with reference to FIGS. 1 to 5. Figure 1 shows the rolling status of H-section steel in a universal rolling mill. That is, the rolled material (H-beam steel) 1 is rolled by an upper horizontal roll 2, left and right vertical rolls 4, and a lower horizontal roll 3.
The material is rolled as shown in the figure.

[0004] In order to ensure dimensional accuracy during this rolling, the roll gap between each roll and the positions of the end faces of the upper and lower horizontal rolls that come into contact with the rolled material must be set accurately before the rolling operation begins. For this purpose, before starting rolling, the upper horizontal roll 2, left and right vertical rolls 4, and lower horizontal roll 3 are brought into contact with each other or with preload applied as shown in the figure (hereinafter referred to as This contact state is called a roll kiss, and this work is called a zero point adjustment work.) It is necessary to perform a zero point adjustment.

On the other hand, as shown in FIG. 3, the roll reshuffling situation is as follows: the three-tiered roll assembly loaded on the off-line traversing trolley 8 moves on the housing outer rail 7 and the housing inner rail 6, and then moves on-line. is inserted into the stand 5 of. The three-tiered stacking situation at this time will be explained with reference to FIGS. 4 and 5. Figure 4 shows the upper and lower horizontal rolls 2 and 3 when their diameters are at their maximum (newly manufactured), and Figure 5 shows the upper and lower horizontal rolls 2 and 3.
indicates when the diameter of is at its minimum (discarded). In the universal rolling mill, the vertical center of the body length of the vertical rolls 4 serves as a reference for setting each roll gap. That is, as shown in the figure, the center of the vertical roll 4 is distributed (this position becomes the center of rolling). In addition, in the universal rolling mill, (A) in Figure 4
Groove section for vertical roll sliding of the stand shown in section (
A three-tiered roll assembly is inserted at a fixed height position) and the rolls are rearranged.

On the other hand, the height positions of the rails 6 and 7 for moving the three-tiered roll assembly are constant, and the height dimension "L" shown in FIGS. 4 and 5, which are relationship diagrams between the two, is constant.
1", which is always constant. Based on this relationship, as can be seen by comparing FIGS. 4 and 5, the positional relationship between the lower horizontal roll chock 11 and the vertical roll chock 12 is as follows.
If the thickness of the spacer 13 used for stacking is constant (dimension "H" in the figure), the rolling surface of the lower horizontal roll 3 will deviate from the rolling center except when the lower horizontal roll 3 has the maximum diameter. Become. This deviation amount can be expressed as (D-d)/2 shown in FIG. In this case, the thickness of the spacer 13 is constant because the vertical roll chock 12 is inserted into the sliding groove of the stand 5 (normally, the height position is constant due to the structure of the stand).

Next, looking at the positional relationship between the upper horizontal roll chock 10 and the vertical roll chock 12, the upper horizontal roll 3
In order to align the rolling surface with the rolling center, the thickness of the spacer 14 must be determined in accordance with the diameter of the upper horizontal roll 3 when in use (corresponding to H to h in the figure). This means that spacers 14 of many different thicknesses are prepared. However, this is actually extremely difficult to manage.

[0008] From the above facts, in the conventional technology, it is impossible to perform roll kissing when each roll is stacked offline, and after inserting a three-tiered roll assembly into an online housing, the gap between the top and bottom cannot be achieved before starting the zero point adjustment work. It is clear that the seats 13, 14 must be removed and that the respective rolls must then be brought into contact and a zero point adjustment operation must be carried out. These operations must be performed before loading the guide into the housing, and the roll kiss situation must be checked from a distance in a confined space.
Also, the spacers 13 and 14 must be removed, which impedes the shortening of roll change time and the speed and ease of zero point adjustment work, as well as high accuracy.

[0009]

[Problems to be Solved by the Invention] As mentioned above, when changing the rolls of a conventional open yoke type universal rolling mill, the geometric characteristics of H-shaped steel rolling (vertical and horizontal symmetry) and the constraints of the housing structure (vertical roll center (1) The rolling surface of the lower horizontal roll deviates from the rolling center depending on the diameter of the roll used.

(2) If it is attempted to align the rolling surface of the upper horizontal roll with the rolling center according to the diameter of the roll used, spacers of many different thicknesses will be required, and management will be difficult.

(3) Online zero point adjustment work is required.

(4) It is necessary to attach and detach the upper and lower spacers.

(5) In order to perform the zero point adjustment work online, there were problems such as the necessity of attaching and detaching guides.

[0014] The present invention solves the above-mentioned problems of the conventional technology, and thereby makes it possible to change rolls in a short time and to perform zero point adjustment quickly and easily with high precision.
The purpose of the present invention is to provide an open yoke type universal rolling mill for rolling section steel.

[0015]

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration. That is, each of the upper horizontal roll chock and the lower horizontal roll chock is provided with a jack for adjusting the positional relationship with the vertical roll chock, and a fastening device is provided for sandwiching and fastening the vertical roll chock between the upper and lower horizontal roll chocks, and a fastening device is provided on the lower horizontal roll chock. This universal rolling mill is characterized by being equipped with a jack and conveying wheels that can be moved in the vertical direction.

[0016]

[Function] In the present invention, each of the upper horizontal roll chock and the lower horizontal roll chock is provided with a jack that adjusts the positional relationship with the vertical roll chock, so even if the roll diameter of the horizontal roll changes, the jack will adjust the vertical roll center each time. Using this as a reference, vertical and horizontal rolls can be easily, precisely, and quickly set.

[0017] Since the lower horizontal roll chock is provided with a conveying wheel that can be vertically interlocked with the jack, the height from the reference position of the center of the vertical roll to the rail tread of the conveying wheel is always constant. A convex guide portion of the vertical roll chock is located at the center of the vertical roll, and the guide portion is slidably fitted into a concave guide groove of a rolling mill housing provided online. Therefore,
The reference position of the center of the vertical roll set offline, that is, the height between the convex guide part of the vertical roll chock and the concave guide groove of the rolling mill housing located online is always the same. become the same height. Therefore, it is possible to assemble it into the online rolling mill housing while maintaining the offline settings.

Furthermore, since a fastening device is provided that clamps and fastens the vertical roll chock between the upper and lower horizontal roll chocks, zero point adjustment work is carried out offline where the four rolls are brought into precise contact or roll kissing by applying preload, and the zero point adjustment state is immediately adjusted. You can incorporate it online without destroying it.

As described above, according to the present invention, it is possible to assemble the four rolls, ie, the upper and lower horizontal rolls and the vertical roll, into the online system after completing the zero point adjustment work offline.

[0020]

[Embodiment] An embodiment of the present invention will be explained with reference to FIGS. 6 to 11. FIG. 6 shows a roll assembly in which the upper horizontal roll 2, the left and right vertical rolls 4, and the lower horizontal roll 3 are rolled-kissed off-line and stacked in three stages. Figure 7 shows the assembled state viewed outward from the vicinity where the rolled material passes (A-A cross section in Figure 6), and the roll assembly viewed from the work side (B-B arrow view in Figure 6). .

Next, the present invention will be explained in detail with reference to FIG. The upper horizontal roll spacer screw shaft 20a of the jack 33 in the figure corresponds to the upper horizontal roll spacer of the conventional method, and the lower horizontal roll spacer screw shaft 20ro corresponds to the lower horizontal roll spacer of the conventional method. do. This lower horizontal roll spacer screw shaft 20 is connected to the wheels 15. The action of this spacer screw shaft will be explained with reference to FIG. As shown in this figure, the lower horizontal roll spacer screw shaft 20 is connected to a worm wheel 2 rotatably built into the lower horizontal roll chock 11.
It is screwed into 2. The worm wheel 22 is also rotatably engaged with a built-in worm 21. A wheel 15 is attached to the lower end of the lower horizontal roll spacer screw shaft 20. When the worm 21 is rotated by this mechanism, the worm wheel 22 is rotated, and the lower horizontal roll spacer screw shaft 20, which is screwed into the worm wheel 22, moves up and down together with the wheel.

This action will be explained based on FIGS. 4 and 5. When the diameter of the lower horizontal roll 3 changes from D to d, in order to bring the rolling surface of the lower horizontal roll 3 into contact with the rolling center and to keep the height position of the wheel 15 constant, as shown in FIG. Lower horizontal roll chock 11 (D-d)/2
All you have to do is raise it. That is, the worm 21 is rotated according to the diameter of the lower horizontal roll 3, and the lower horizontal roll spacer screw shaft 20 is lowered by (D-d)/2. This is to reduce the "H" dimension in FIG. 5 by (D-d)/2 and to increase the "F" dimension by (D-d)/2. That is, the purpose is to create a roll kiss while maintaining the "L1" dimension in the figure. This results in
The rolling surface of the lower horizontal roll 3 can be brought into contact with the rolling center. The relationship between the upper horizontal roll spacer screw shaft 20a is similar to that of the lower horizontal roll, but the wheels 15 are not required for the upper horizontal roll.

Next, a method of stacking each roll in three stages and completely fixing the roll kissing state will be explained with reference to FIG. As described above, the rolls are stacked in a roll-kissing state using the upper and lower horizontal roll spacer screw shafts, and then fastened using the fastening rod 30 of the fastening device 34. This fastening rod 3
0 has a hydraulic cylinder 31 at one end, and a fastening nut 32 at the other end. The gap between the hydraulic cylinder 31 and the fastening nut 32 is widened beyond the stacking dimension (dimension A in the figure), and the hydraulic cylinder 31 is inserted from the side, and pressure is applied to the hydraulic cylinder 31 to form a three-stage stacked roll assembly at the stepped portions at both ends. Incorporate into stand 5. Then, the roll assembly is placed in the sliding groove of the vertical roll chock of the stand 5.

Thereafter, each roll is set to each roll-down device while applying preload using the upper horizontal roll-down device, the lower horizontal roll-down device, and the left and right vertical roll-down devices. In other words, you can insert it into the online stand without destroying the zero point settings that you have spent a lot of time configuring offline.
With this roll kiss state, it becomes possible to set the preload zero point in each rolling down device. Note that the offline zero point adjustment work time has sufficient margin, unlike the online roll change time.

[0025]

As described above, according to the present invention, roll change and zero point adjustment work can be performed quickly, easily, automatically, and with high precision in a short time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the rolling status of H-beam steel in a universal rolling mill.

FIG. 2 is a diagram showing a roll kiss state of the universal rolling mill.

FIG. 3 is a diagram showing a conventional role reshuffling situation.

FIG. 4 is a diagram illustrating a three-stage stacked state in conventional roll reshuffling when the diameter is at its maximum.

FIG. 5 is a diagram illustrating a three-stage stacked state in conventional roll rearrangement at the minimum diameter.

FIG. 6 is a diagram illustrating the state of the roll assembly of the present invention.

7 is a diagram showing the AA cross section (left half) and the BB arrow view (right half) of FIG. 6. FIG.

8 is a diagram showing a CC cross section (left half) and a D-D cross section (right half) of FIG. 6. FIG.

FIG. 9 is a diagram showing a sectional view taken along line EE in FIG. 6;

[Explanation of symbols]

1: Rolled material (H-beam steel) 2: Upper horizontal roll 3: Lower horizontal roll 4: Vertical roll 5: Rolling mill housing (stand) 6: Rail inside the housing 7: Housing outer rail 8: Offline rampant trolley 10: Upper horizontal roll chock 11: Lower horizontal roll chock 12: Vertical roll chock 15: Conveyance wheel 20: Screw shaft 22: Worm wheel 30: Tightening rod 31: Hydraulic cylinder 32: Fastening nut 33: Jack 34: Fastening device

Claims (1)

[Claims] 1. Each of the upper horizontal roll chock and the lower horizontal roll chock is provided with a jack for adjusting the positional relationship with the vertical roll chock, and a fastening device is provided for sandwiching and fastening the vertical roll chock between the upper and lower horizontal roll chocks, A universal rolling mill characterized by being equipped with a jack provided on a roll chock and conveying wheels that can be interlocked in the vertical direction.