JPS6149707A - Multistage multipass rolling mill - Google Patents

Abstract

PURPOSE:To manufacture stably a steel sheet having a uniform sheet thickness by housing each roll chock of upper and lower rolls in a main housing of a multisage multipass rolling mill and housing each roll chock of intermediate rolls in a subhousing supported by the main housing. CONSTITUTION:In case of rolling a steel sheet 1 by a multistage multipass mill consisting of upper and lower rolls 2, 3 and intermediate rolls 4, 4; a roll chock 5 of the upper roll 2 is supported by a main housing 10 through a rolling-reduction screw 7, and a chock 6 of the lower roll 3 is supported by the housing 10 through a hydraulic cylinder 9, and a balancing cylinder 11 is interposed between both chocks 5, 6. Each of roll chocks 12, 13 of the upper and lower intermediate rolls 4, 4 is also supported by a subhousing 16 through a rolling-reduction screw 14 and a hydraulic cylinder 15. The subhousing 16 is fixed to the main housing 10 through connecting members 17, 18. Because each of the chocks 5, 6, 12, 13 is directly supported at its upper and lower parts by the rolling-reduction screw and the hydraulic cylinder, the sheet position is not deviated even when a rolling force fluctuates, and a steel sheet of uniform sheet thickness is stably manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-stage multi-bus rolling mill used for true speed rolling, true speed drawing rolling, and the like.

[Prior Art] The roll support structure in a multi-stage multi-bus rolling mill used for true speed rolling and true speed drawing rolling of plate material a shown in Fig. M5 and Fig. 6 is as shown in Figs. , lower rolls b, c and middle rolls d, d, each axle box e, f,
g and h are housed in a common housing i, and upper and lower axle boxes e and ``a lowering screw j and a hydraulic cylinder k are provided at the upper and lower parts, respectively, and a balance cylinder or bending cylinder 1 is installed between each axle box. . m are arranged to support each axle box e, f, g, h.

[Problems to be Solved by the Invention] However, according to this structure, the middle rolls d and d are supported by the balance cylinder 1.1 which has a relatively weak supporting force, and therefore, due to differences in the coefficient of friction during rolling, etc. When the rolling force fluctuates, the positions of the axle boxes g and h of the middle rolls become biased, resulting in a disadvantage that a product with a uniform thickness cannot be obtained.

[Means for Solving the Problems] In view of the above-mentioned drawbacks, the present invention has been made to provide a multi-stage, multi-pass rolling fold in which the support structure of the middle roll is strong, and each axis of the upper and lower rolls is The box is housed in the main housing, and each shaft box of the middle roll is housed in a subhousing supported by the main housing.

[Function] Since the upper and lower rolls and the middle roll are directly supported by the housing, the roll support structure is strong and a product with uniform thickness can be obtained.

[Embodiment J] Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1st
Figures 4 to 4 show a first embodiment in which the present invention is applied to a four-high rolling mill. 4, 4 is the middle roll, 5
．． 5 and 6.6 are axle boxes arranged at both ends of the upper roll 2 and lower roll 3, respectively.
5 is supported by the main housing 10 via a reduction screw 7.7, and the lower roll axle boxes 6, 6 are supported by the main housing 10 via a hydraulic cylinder 9.9. It is formed in a U-shape so as to surround the roll 4.4 (the sixth
(see figure), each axle box 5, 6 sub is equipped with a balance cylinder 11.
11 are intervening.

Upper and lower axle boxes 12, 12 and 1 of middle roll 4.4
3.13 as well as for the upper and lower rolls, a reduction screw 14.14 and a hydraulic cylinder 15.15, respectively.
The sub-housing 16 is supported by the main housing 10 via coupling members 17.18.
The position between the upper and lower axle boxes 12 and 13 is adjusted by PAs 19 and 19 which are driven to suppress the rolling center p from the front and rear sides of the sub-housing 16.
．． 19 is pressed and driven by a screw mechanism or hydraulic mechanism (not shown).

Upper, lower and middle roll shaft boxes 5, 6, 12°13
Both are directly supported at the top and bottom by the rolling screw 7.14 and the hydraulic cylinder 9.15, so even if the rolling force fluctuates, the position will not shift and a product with uniform thickness can be obtained. I can do things.

A second embodiment of the invention is shown in FIG. In this example, a balance cylinder 20 is used instead of the model 19 in the first embodiment.
This arrangement has the advantage that the load between the axle boxes 12 and 13 of the middle rolls can be evenly divided, and the structure other than the above is the same as the first embodiment.

It should be noted that the present invention is not limited only to the above-mentioned embodiments, and may be applied to a three-high rolling mill in which 0-rolls are rolled in three stages, for example, without departing from the gist of the present invention. Of course, various changes can be made within the scope.

[Effects of the Invention] As described above, the multi-stage multi-bus rolling mill of the present invention has the following features:
The axle boxes of the lower roll and middle roll are housed in the main housing and sub-housing, respectively, and the sub-housing is supported by the main housing, so the position of each axle box is firmly supported, which prevents fluctuations in rolling force. It exhibits excellent effects such as obtaining uniform rolled products even when rolled.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a front view of a four-high rolling mill, and FIGS. 2 and 3 are in the direction ■-■ in FIG. 4 shows a second embodiment of the present invention, a cross-sectional side view corresponding to FIG. 3, and FIGS. 5 to 8.
The figure is an explanatory diagram of a conventional multi-stage multi-bus rolling mill. Figures 5 and 6 are explanatory diagrams of true speed rolling and true speed pull rolling, respectively. Figure 7 is a front view of a four-high rolling mill. Figure 8 is an illustration of a conventional multi-stage multi-bus rolling mill. 7 is a view taken from the ■-■ direction in FIG. 7. In the figure, 2 is the top roll, 3 is the bottom roll, 4 is the middle roll,
5.6, 12.13 are the shaft cylinders, 10 is the main housing,
16 indicates a subhousing. Patent application: Jin Ishikawajima Harima Heavy Industries Co., Ltd. Patent application: Shin Nippon Steel Corporation Patent application: Toshiba Co., Ltd. Figure 5 Figure 7 Dimensions Figure 6 Figure 8 @

Claims (1)

[Claims] 1) Store the upper and lower roll axle boxes in the main housing,
A multi-stage multi-bus rolling mill characterized in that each shaft box of the middle rolls is housed in a sub-housing supported by the main housing.