JP2991782B2 - Universal rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal rolling mill for hot rolling equipment for H-section steel, which is capable of performing a roll change in a short time and performing a zero-point adjustment work quickly, easily and accurately. The present invention relates to a yoke type universal rolling mill.

[0002]

2. Description of the Related Art In a conventional open yoke type 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 these are stacked in a three-stage state to an online stand. Inserted. Then, using a lower horizontal roll lowering device, left and right vertical roll lowering devices, and an upper horizontal roll lowering device online, the worker checks the roll kiss state of each roll and performs a zero point adjustment operation.

[0003] This conventional zero adjustment operation will be described with reference to FIGS. FIG. 1 shows a rolling state of an H-section steel in a universal rolling mill. That is, the rolled material (H-section steel) 1 is composed of an upper horizontal roll 2, left and right vertical rolls 4 and a lower horizontal roll 3.
Is rolled as shown.

In this rolling, in order to ensure the dimensional accuracy, the roll gap between the rolls and the end face position of the upper and lower horizontal rolls in contact with the rolled material must be accurately set before the start of the rolling operation. For this purpose, before starting the rolling, the upper horizontal roll 2, the right and left vertical rolls 4 and the lower horizontal roll 3 contact as shown in FIG. This contact state is called a roll kiss, and this operation is called a zero point adjustment operation.) It is necessary to perform zero point adjustment.

On the other hand, as shown in FIG. 3, the roll change situation is as shown in FIG. 3, where the three-stage roll assembly loaded on the off-line traversing carriage 8 moves on the outer rail 7 and the inner rail 6 of the housing and moves on-line. Stand 5
Is inserted into. The situation of the three-stage stacking at this time will be described with reference to FIGS. FIG. 4 shows the case where the diameter of the upper and lower horizontal rolls 2 and 3 is the maximum (newly manufactured), and FIG.
3 shows the time when the diameter is minimum (discarded). In the universal rolling mill, the center in the vertical direction of the body length of the vertical roll 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 is the rolling center). In a universal rolling mill, a three-stage roll assembly is inserted into a groove (the height position is constant) for vertical roll sliding of the stand shown in FIG.

On the other hand, the height positions of the rails 6 and 7 for moving the three-stage roll assembly are constant, and the height dimension "L" shown in FIG. 4 and FIG.
1 ", which is always constant. As can be seen by comparing FIGS. 4 and 5 with this relationship, the positional relationship between the lower horizontal roll chock 11 and the vertical roll chock 12 is determined by the position of the spacer 13 used for stacking. Assuming that the thickness is constant (dimension "H" in the figure), the rolling surface of the lower horizontal roll 3 will be off the center of rolling except when the lower horizontal roll 3 has the maximum diameter. Indicated (D−d) /
It can be expressed as 2. In this case, the vertical roll chock 1
2 is inserted into the slide groove of the stand 5 (usually, the height position is constant due to the structure of the stand), so that the thickness of the spacer 13 is constant.

Next, looking at the positional relationship between the upper horizontal roll chock 10 and the vertical roll chock 12,
In order to make the rolling surface coincide with the rolling center, the thickness of the spacer 14 must be determined according to the diameter when the upper horizontal roll 3 is used (corresponding to H to h in the drawing). This results in the provision of spacers 14 of many different thicknesses. However, this is practically very difficult to manage.

From the above facts, according to the prior art, roll kisses cannot be made when each roll is stacked off-line, and after inserting the three-stage roll assembly into the online housing, before and after starting the zero point adjustment work, the vertical gap is required. It is clear that the seats 13, 14 have to be removed and then the rolls have to be brought into contact to perform the zeroing operation. These tasks must be performed before loading the guide into the housing, checking the roll kissing condition in a narrow place and from a distance,
In addition, since the spacers 13 and 14 have to be removed, the time required for changing the rolls is reduced, and the zero point adjustment operation is facilitated quickly and with high accuracy.

[0009]

As described above, in the roll change of the conventional open yoke type universal rolling mill, the geometrical characteristics of the H-section steel rolling (vertical symmetry) and the restriction of the housing structure (the vertical roll center) (1) The rolling surface of the lower horizontal roll deviates from the center of the rolling depending on the diameter of the roll used.

(2) If the roll surface of the upper horizontal roll is to be adjusted to the center of the roll in accordance with the diameter of the roll used, many types of thickness spacers are required and management becomes difficult.

(3) An on-line zero adjustment operation is required.

(4) The work of attaching and detaching the upper and lower spacers is essential.

(5) In order to perform the zero point adjustment work online, there is a problem that the work of attaching and detaching the guides is indispensable.

The present invention is to solve the above-mentioned conventional problems, whereby the roll change can be performed in a short time, and the zero point adjustment operation can be performed quickly, easily, and with high accuracy.
An object of the present invention is to provide an open yoke type universal rolling mill for section steel rolling.

[0015]

In order to achieve the above object, the present invention has the following constitution. That is, in each of the upper horizontal roll chock and the lower horizontal roll chock, a jack for adjusting the positional relationship with the vertical roll chock is provided, and the vertical roll chock is sandwiched between the upper and lower horizontal roll chocks, and a fastening device for fastening is provided, and the lower horizontal roll chock is provided. A universal rolling mill characterized by being provided with a transporting wheel that can be vertically interlocked with a jack.

[0016]

According to the present invention, the upper horizontal roll chock and the lower horizontal roll chock are each provided with a jack for adjusting the positional relationship with the vertical roll chock. The upper and lower horizontal rolls can be set easily, accurately, and quickly on the basis of.

Since the lower horizontal roll chock is provided with transport wheels that can be vertically interlocked with the jack, the height from the reference position at the center of the vertical roll to the rail tread surface of the transport wheels is always constant. At the center of the vertical roll, there is a convex guide portion of a vertical roll chock, and the guide portion is slidably fitted in a concave guide groove of a rolling mill housing provided online. for that reason,
The reference position of the vertical roll center set off-line, that is, the height of the convex guide portion of the vertical roll chock and the concave guide groove of the rolling mill housing online is always. Will be the same height. Therefore, it is possible to incorporate the apparatus into the online rolling mill housing with the state set offline.

Furthermore, since the vertical roll chock is sandwiched between the upper and lower horizontal roll chocks and a fastening device for fastening is provided, a zero-point adjustment operation is performed in which the four rolls are accurately contacted or pre-pressed and roll-kissed, and the zero-point adjustment state is performed as it is. Can be integrated online without breaking down.

As described above, according to the present invention, it is possible to incorporate the four rolls of the upper and lower horizontal rolls and the vertical rolls off-line in a state where the zero-point adjustment work is completed.

[0020]

An embodiment of the present invention will be described with reference to FIGS. 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 roll-kissed off-line and stacked in three stages. FIG. 7 shows the assembled state (cross section taken along the line AA in FIG. 6) viewed from the vicinity where the rolled material passes through and the roll assembly viewed from the work side (in the direction of arrow BB in FIG. 6). .

Next, the present invention will be described in detail with reference to FIG. The upper horizontal roll spacer screw shaft 20a of the jack 33 in the figure corresponds to the conventional upper horizontal roll spacer, and the lower horizontal roll spacer screw shaft 20b corresponds to the conventional lower horizontal roll spacer. I do. The lower horizontal roller spacer screw shaft 20 b is connected to the wheel 15. FIG. 8 explains the operation of the spacer screw shaft. As shown in this figure, the lower horizontal roll spacer screw shaft 20 is screwed into a worm wheel 22 rotatably incorporated in the lower horizontal roll chock 11. The worm wheel 22 meshes with the worm 21 which is also rotatably contained. The wheel 15 is attached to the lower end of the lower horizontal roll spacer screw shaft 20B. When the worm 21 is rotated by this mechanism, the worm wheel 22 is rotated, and the lower horizontal roll spacer screw shaft 20b screwed therein is moved up and down together with the wheel.

This operation will be described with reference to FIGS. When the diameter of the lower horizontal roll 3 changes from D to d, the rolling surface of the lower horizontal roll 3 is brought into contact with the rolling center,
In addition, in order to keep the height position of the wheels 15 constant, as shown in FIG.
You only need to raise it by two. 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 reduces the "H" dimension in FIG. 5 by (D-d) / 2 and increases the "F" dimension by (D-d) / 2. That is, a roll kiss is created while maintaining the “L ₁ ” dimension in the figure. This allows
The rolling surface of the lower horizontal roll 3 can be brought into contact with the center of rolling. The relation of the upper horizontal roll spacer screw shaft 20a is the same as that of the lower horizontal roll, but the upper horizontal roll does not require the wheel 15.

Next, a system in which the rolls are stacked in three stages and the roll-kissed state is completely fixed will be described with reference to FIG. As described above, the rolls are stacked in a roll kiss state using the upper and lower horizontal roll spacer screw shafts, and fastened by the fastening rod 30 of the fastening device 34. The fastening rod 30 has a hydraulic cylinder 31 at one end and a fastening nut 32 at the other end. The interval between the hydraulic cylinder 31 and the fastening nut 32 is set to be larger than the stacking dimension (the dimension A in the drawing), inserted from the side, and the hydraulic cylinder 31 is inserted.
The three-stage roll assembly is assembled into the stand 5 by applying pressure to both ends. Then, the roll assembly is put into the sliding groove of the vertical roll chocks of the stand 5.

Thereafter, each roll is set to each of the rolling devices while applying a preload by using the upper and lower horizontal rolling devices, the lower horizontal rolling device and the left and right vertical rolling devices. That is, it is possible to set the preload zero point in each of the rolling-down devices by inserting into the online stand and setting the roll kiss state without breaking the configured zero point setting by taking sufficient time offline. It should be noted that the zero-point adjustment work time offline has a sufficient margin unlike the online roll change time.

[0025]

As described above, according to the present invention, it is possible to quickly, easily, automatically, and accurately perform a roll change or a zero adjustment operation in a short time.

[Brief description of the drawings]

FIG. 1 is a view showing a rolling state of an H-section steel in a universal rolling mill.

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

FIG. 3 is a diagram showing a conventional roll change situation.

FIG. 4 is a view for explaining a three-stage stacking state in a conventional roll change when the diameter is maximum.

FIG. 5 is a diagram illustrating a conventional three-stage stacking state in a roll change when the diameter is minimum.

FIG. 6 is a view for explaining the situation of the roll assembly of the present invention.

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

FIG. 8 is a diagram showing a CC section (left half) and a DD section (right half) of FIG. 6;

FIG. 9 is a sectional view taken along the line EE of FIG. 6;

[Explanation of symbols]

 1: Rolled material (H-section steel) 2: Upper horizontal roll 3: Lower horizontal roll 4: Vertical roll 5: Rolling mill housing (stand) 6: Rail inside housing 7: Rail outside housing 8: Off-line trolley 10: Upper Horizontal roll chock 11: Lower horizontal roll chock 12: Vertical roll chock 15: Conveying wheel 20: Screw shaft 22: Worm wheel 30: Fastening rod 31: Hydraulic cylinder 32: Fastening nut 33: Jack 34: Fastening device 35: Convex guide of vertical roll chock Part 36: concave guide groove (sliding groove) of rolling mill housing

Claims (1)

(57) [Claims] 1. An upper horizontal roll chock and a lower horizontal roll chock are each provided with a jack for adjusting a positional relationship with a vertical roll chock, and a fastening device for sandwiching and fastening the vertical roll chock between the upper and lower horizontal roll chocks is provided. A universal rolling mill comprising a transport wheel that can be vertically interlocked with a jack provided on a roll chock.