JPS60118309A - Roll chock in cross-roll mill - Google Patents

Abstract

PURPOSE:To reduce remarkably the unbalance of a rolling down force by forming the roll chock of a cross-roll mill by a radial roll chock for receiving a radial load and a thrust chock for receiving a thrust load. CONSTITUTION:The journal 8a of a backup roll 8 which is in contact with a work roll 2 is supported by a radial chock 101 through a radial bearing 9, the journal 8b of backup roll 8 is supported by a thrust chock 102 through a thrust bearing 11, the chock 101 and the chock 102 are joined together by through bolts 103 through a positioning spacer 104, and a clearance 8 is set by springs 107, 108. Further, the chock 101 acts on the roll 2 to transmit a rolling load transmitted to the roll 8 to rolling reduction screws 10; on the other hand, the chock 102 transmits a thrust to chock clamps. In this way, the unbalance of a rolling down force is remarkably reduced, and its sheet thickness control is easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll chock in a cross-roll rolling mill.

A method of controlling the thickness distribution of a rolled product in the width direction by rolling with crossed rolls was already disclosed in JP-A-55
This method is known from Japanese Patent Laid-Open No. 55-153605 and Japanese Patent Application Laid-open No. 55-153605.

Generally, when rolling is performed by crossing the upper and lower roll groups at a required cross angle of 0, as shown in FIG. Since the difference is in the θ phase, the difference is in the roll axis direction.
T is generated, and a thrust force 1' is generated on the upper work roll 2. For the lower work roll 3, a thrust force T' having the same magnitude and opposite direction as T is generated for the same reason.

Therefore, in the cross-roll rolling mill, a work roll chock clamp and a backup roll chock clamp are respectively installed in the work side housing in order to support the work rolls 2 and 3 and the backup roll in the housing against the thrust force.

By the way, a cross-roll rolling mill is basically designed so that the gap δW between the work roll chock clamp 4 and the work roll chock 5 shown in FIG. 2 is smaller than the gap δB between the backup roll chock clamp 6 and the backup roll chock 7. In this case, there is no need to study hard, but if δB < δW due to wear etc., the following problem will occur. In addition, A in Fig. 2 is the drive side,
B is the working side.

Due to the thrust force generated in the work roll, the work roll moves to the work side as a unit until the backup roll position and the gap between the backup roll chock clamp part δB = = Q, and then the work roll and the backup roll move toward each other. After this occurs, the gap δW in the work roll chock clamp portion becomes zero, and the thrust force is supported by the work roll chock. However, as shown in FIG. 3, since the backup roll 8 transmits the rolling load to the housing via the reduction screw 10, the frictional force generated between the upper surface of the backup roll chock 7 and the lower end of the reduction screw 10 is extremely large. , so no slipping can be expected in this area. Therefore, the gap δB of the backup roll chock clamp portion is not zero, but is supported by the upper surface of the thrust cover backup roll chock 7 acting on the backup roll 8.

In this case, as can be seen from FIG. 4, in order for the moment of the entire roll to be balanced, the following equation occurs. As a result, when the rolling load is P, the load detected by the work side load cell is Pw=P/2+ΔP. On the other hand, the load detected by the drive-side load cell is pD=Sa〆2-ΔP, and a large imbalance occurs between the output values of the left and right load cells. If the unbalance of the rolling blade is large, it will adversely affect the plate thickness control and cause a delay in making the rolling operation difficult.

The present invention solves the drawback of the roll chock in the cross-roll rolling mill described above, namely, that the thrust force generated by the work roll is received by the frictional force between the upper surface of the chock and the lower end surface of the reduction screw, which causes a large unbalance of the reduction blade. This was done with the aim of resolving the issue that was occurring.

The gist of the present invention for achieving the above object is that the roll chock in a cross-roll rolling mill (3-) in which upper and lower rolls are crossed is configured with a radial chock that receives a radial load and a thrust chock that receives a thrust load. .

Hereinafter, a roll chock according to the present invention will be explained in detail based on an embodiment shown in the drawings.

FIG. 5 shows a longitudinal section of one embodiment. 2 is a work roll, 8 is a backup roll that contacts the work roll 2, and 8a and 8b are stepped shaft portions thereof. The shaft portion 8a is supported by a radial chock 101 via a radial bearing 9.

10 This is a reduction screw that is in contact with the upper surface of the radial chock 101. Shaft portion 8b of backup roll 8
is supported by a thrust chock 102 via a thrust bearing 11. This streak chock 102 and the radial load.

The radial chock 101 is combined with the chock 101 to constitute the row chock of the rolling mill.
and the thrust chock 102 have a through bolt 1 in the axial direction.
03 is passed through the thrust chock 102, a positioning spacer 104 having one end in the form of a 4-lunge is fitted, and the other end is brought into contact with a spring holder 105. Push the nut 10 onto the end of the bolt 103.
6 is tightened, and the radial chock 101 and thrust chock 102 are coupled in the axial direction. Springs 107 and 108 are provided between the thrust chock 102 and the radial chock 101 and between the thrust chock 102 and the spring retainer 105, and these springs 107 and 1
The gap δ between the thrust chock 102 and the radial chock 101 is initially set by the spring force of 08. Incidentally, an O-ring provided at the dividing portion of both chocks 101 and 102 of the 109 company prevents water and scale from entering the bearings 9 and 11.

The radial chock 101 acts on the work roll 2,
The rolling load transmitted to the backup roll 8 is carried through the radial bearing 9 and further transmitted to the reduction screw 10. On the other hand, the thrust chock 102 similarly receives the thrust force generated by the work roll 2 and passed through the radial bearing 9 with the thrust bearing 11, and transmits it to the chock clamp.

Therefore, if this mechanism is used, even if the gap δW between the work roll chock 5 and the work roll chock clamp 4 shown in FIG. 10
2 using the positioning spacer 104.
>By setting δB and δW, the generated thrust force can be borne only by the work roll chock 5 by first setting δw=Q, and it is no longer supported by the upper surface of the radial chock 101 and the lower end surface of the reduction screw 10.

As a result, the rolling force unbalance ΔP detected by the load cell is as follows (see Figure 4), which is generally 4, medium 0.01 (1%
), it can be said to be so small that it can be ignored.

As mentioned above, by configuring the roll chock in a cross roll rolling mill with a radial chock that receives a radial load and a thrust chock that receives a thrust load, the gap between the work roll chock and its chock clamp, and the gap between the backup roll chock and its chock clamp are reduced. The unbalance of the rolling blade can be made negligibly small regardless of the size of the gap, and control can be facilitated.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the state of force generation in a cross-roll rolling mill, Figure 2 is a schematic plan view showing the support relationship between work rolls and backup rolls in a cross-roll rolling mill, and Figure 3 is a conventional roll chock. FIG. 4 is an explanatory view showing the generation and transmission of force in a cross-roll rolling mill, and FIG. 5 is a longitudinal cross-sectional view of a roll chock according to an embodiment of the present invention. In the drawing, 7-1 is the material to be rolled, 2.3 is the upper and lower work rolls, 4 is the work roll chock clamp, 5 is the work roll chock, 6 is the backup roll chock clamp, 7 is the backup roll chock, 8 is the backup roll, 8a, 8b is the shaft of the backup roll, 9 is a radial bearing, 10 is a reduction screw, 11 is a thrust bearing, 101 is a radial chock, 102 is a thrust chock, 103 is a through bolt, 104 is a positioning spacer, 105 is a spring presser, 106 is a Nut, 107 and 108 are springs, and 109 is O-ring. 8 - Figure 2A Figure 3 46! El

Claims (1)

[Claims] A roll chock in a cross-roll rolling mill in which upper and lower rolls intersect is composed of a radial chock that receives a radial load and a thrust chock that receives a thrust load.