JPS59183913A - Hydraulic rolling-down device of cross roll type rolling mill - Google Patents

Abstract

PURPOSE:To provide high productivity with a low equipment cost by punching a hole to be used as a cylinder on the surface of an equalizer beam and inserting a plunger into said hole thereby constituting a hydraulic rolling-down device. CONSTITUTION:A hole into which a plunger 36 is inserted and is used as a cylinder is punched in the position of an equalizer beam 30a matching with the central position of a rolling-down screw 32. A hydraulic rolling-down device 39 is formed by the hole 37, the plunger 36 and a cylinder cover 38, and the separate setting of the right and left roll gaps of upper and lower work rolls 21a, 21b is made possible by the device 39.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a hydraulic rolling device for a cross-roll type four-high rolling mill.

For the purpose of improving the thickness accuracy in the width direction of rolled products and extending the life of the rolled products by abrasion of the rolls, the present applicants filed a patent application filed in Japanese Patent Application No. 53-1.
A cross-roll four-high rolling mill was proposed as shown in No. 38837 and Japanese Patent Application No. 54-59327.

Here, with reference to Figures 1 and 2, the patent application filed in 1983-13
The invention of No. 8837 will be explained. First, in Figure 1,
11 is a rolled material, 12 is an upper work roll, and 12' is a lower work rule, and these two work rolls 12 and 12' form a pair of upper and lower work rolls. 13 is an upper backup roll, 13' is a lower backup roll, and arrow 14 indicates the direction in which the backup rolls 13, 13' are rolled down by a rolling down device (not shown). As shown in FIG. 2, the axis 16 of the upper work roll 12 and the axis flJ17 of the upper backup roll 13 (7) are in the same vertical plane and constitute a set of upper rolls. On the other hand, the lower work roll 12'C') axis 816' and the lower puncture-up roll 13' (D axis 17') are a set of lower rolls located in the same vertical plane different from the upper roll group. and the axis 16 of the upper roll group.
17 and the axes 16' and 17' of the lower roll group intersect at an intersecting angle θ (Fig. 2), and the intersecting angle θ
is configured so that it can be adjusted in the horizontal plane by a hydraulic, mechanical or other appropriate roll cross mechanism (not shown), and the cross-sectional shape of the rolled material 11 can be controlled by adjusting the crossing angle θ. ing. Further, the arrow 15 is indicated by a pendant hook providing mechanism (not shown) that is interposed at both ends of the upper and lower work rolls 12.12' and operates to separate both ends of the work rolls 12.12' from each other. Work roll 1z.

The direction of the pending force applied to both end shaft portions of the rolled material 11 is shown, and the cross-sectional shape of the rolled material 11 is
Furthermore, it has a configuration that can be easily obtained optimally.

By the way, in the rolling mill shown in FIGS. 1 and 2, when the upper and lower roll pairs are crossed with each other by the roll cross mechanism, the center point of the bearing of the upper backup roll and the center position of the rolling screw, which is the rolling device, are This causes a relative displacement in the horizontal direction, and a bending moment is generated in the reduction screw according to the amount of deviation, which has an adverse effect on the reduction screw. Similarly, there was a structural defect in that the same phenomenon as described above occurs with respect to the center point of the bearing of the lower backup roll and the center position of the screw jacking device.

In order to eliminate this drawback, the present applicant first applied for a patent application filed in 1983-
We proposed a cross-roll type four-high rolling mill shown in No. 32613. FIG. 3 shows an embodiment of the invention. As shown in the figure, a pair of upper and lower work rolls 21 pinch the rolled material 1.
Both ends of a and 21b are work roll chocks 22a, respectively.

While being rotatably supported by the zzb, the work roll 21
A pair of upper and lower backup rolls 2 circumscribing a and 21b
3a and 23b also have backup roll chocks 24a at both ends.

The roll chocks 24a, 24b are formed into a lip channel steel shape, and the work roll chocks 22a, 22b are supported at the tips of the roll chocks 24b in a lip-corresponding portion.
The backup row/l/f yoke 24a, 24b is supported in such a way that the back-up row/l/f yoke 24a, 24b is fitted into the housing 25 with a gap between the outer walls and the housing 25. Further, in order to impart roll bending to the work rolls 21a and 21b, work roll chocks 22a and 22b and pack edges f are used.

- Roll bending devices 26a, 26b are disposed between the work roll chocks 24a, 24b and extend vertically, sandwiching the work roll chocks 22a, 22b. -Hydraulic jacks 27a, 27b for adjusting the sword and roll
, 27c, 27d, 28'a.

zsb, 28C, 28d and pedestals 29a, 29b are provided, and these constitute a roll cross mechanism. Furthermore, in order to provide a reduction blade, an equalizer beam 30a is provided whose both ends abut against the inner wall of the opening of the housing 25, and is located at the upper end of the back aligner f o -le chock 24a.
The lowering screw 32 and the hydraulic lowering device 3 are operated by the screw set lowering device 31 provided on the upper part of the housing 25.
4, an equalizer beam 30b is also provided under the lower backup roll chock 24b, and a screw set jacking device 33 disposed at the bottom of the housing 25 is used to tighten the equalizer beam 30a. It is configured to synchronize with the vertical movement of.

With the above configuration, when the upper and lower roll groups cross each other, the center points of the lowering devices 31 and 34 and the lower screw type jack-up device 33 and the upper and lower backup roll chocks 24a.

The moment due to the relative horizontal deviation of the center point of 24b is 0, which is the vertical echo beam 30a.

Due to the rigidity of 30b, the internal stress is absorbed, so that the adverse effects on each lowering device 31, 34 and screw type jacking device 33 can be eliminated.

However, the prior art shown in FIG. 3 still has the following drawbacks. That is, this rolling mill usually uses an automatic plate thickness control device (person Q) to improve the longitudinal thickness accuracy of the rolled material 20.
It is abbreviated as C. ) is used. For this reason, it is necessary to always accurately detect the vertical position of the plunger (not shown) of the hydraulic rolling down device 34 during rolling.

Therefore, it is necessary to increase the rigidity of the hydraulic lowering device 34, and in particular to eliminate vertical displacement due to distortion of the cylinder cover and cylinder bottom due to the working oil pressure.Therefore, the hydraulic lowering device 34 has to be powerful and large, and the overall height has to be reduced. growing.

Furthermore, since the hydraulic lowering device 34 is disposed between the lowering screw 32 and the upper equalizer beam 30a, the overall height of the housing 25 increases accordingly. As a result, the weights of the hydraulic lowering device 34 and the housing 25 increase, and the equipment cost increases.

Further, both longitudinal ends of the equalizer beams 30a and 30b are affected by vibrations caused by the impact generated when the rolled material 20 is bitten into a roll, and the contact surfaces of the hydraulic lowering device 34 and the equalizer beam 30a are mutually affected. Collision causes wear, which adversely affects the performance of A, G, and C. Therefore, it is often necessary to repair the abutment surface to the correct surface, but this has drawbacks such as a decrease in production efficiency and an increase in maintenance costs.

The present invention aims to eliminate the above-mentioned drawbacks and to provide a hydraulic lowering device with low equipment costs, high productivity, and low maintenance costs. The technical idea of the present invention, which achieves this object, is based on the fact that a cylinder of a hydraulic pressure reduction device is provided by being bored in an equalizer beam, and a syringe is inserted into the cylinder.

Embodiments of the present invention will be described below with reference to FIGS. 4 and 5. Note that parts that are the same as those in the prior art are given the same numbers. As shown in both figures, upper pack arag rolls 23 are installed in a pair of left and right housings 25 disposed on the work side A and the drive side B.
An upper backup roll chock 24a and an upper work roll chock (not shown), which respectively support the upper work roll 21a and the upper work roll 21a, are supported so as to be vertically movable. Further, a pair of electric screw lowering devices 31 for operating a lowering screw 32 and a breaker block 35 are mounted on the top of the housing 25 . Between the lowering device 31 and the upper backup roll chock 24a, an upper e-flip beam 3Qa is disposed, which is movable up and down and is horizontally restrained by the inner wall of the haunong 25. It is set up. The equalizer beam 3Qa has a hole 37 formed into a cylinder, into which a cylinder 36 is inserted, which corresponds to the center position of the reduction screw 32. A hydraulic lowering device 39 is formed by the cylinder hole 37, plunger 36, and cylinder cover 38, and this hydraulic lowering device 3cI lowers the upper and lower work rolls 2ia, zz.
The left and right roll gaps of b can be set separately. The breaker block 35 has a spherical seat formed on its upper surface and engages with the lowering screen L-32km, and its lower surface abuts the recessed portion of the plunger 36 so as to be able to move together. Furthermore, a pair of position detection sensors 4o are embedded in the center of the granger 36, and are connected to both the plunger 36 and the equalizer beam 30a, so that the vertical position of the plunger 36 can be detected. In addition, the lower surface of the equalizer beam 30H is attached to the upper backup roll chock 2+
It is mounted so as to be slidably in contact with a rocker plate 41 that is engaged with a. The balance cylinder 42 for lifting the upper equalizer beam and the balance cylinder 43 for lifting the upper puncture and roll are each connected to the housing 25.
is installed on. Although not shown, like the lower bank up four wheel and lower work roll pair, and the upper roll group, they are supported vertically within the housing 25 via a lower backup roll chock and a lower work roll chock, respectively. The lower surface of the backup roll chock is supported by a pair of screw jacks disposed at the bottom of the housing via a rocker grate and a lower flip beam.

Note that the roll bending device and the roll crossing device have the same configuration as the technology shown in FIG. 3, so they are not shown here.
The explanation will be omitted.

In the above embodiment, the upper equalizer beam 30a is provided with a hole 37 that serves as a hydraulic cylinder, and the plunger 36 is inserted into the hole 37.
7 has been described, but it goes without saying that it is also possible to drill a hole in the lower equalizer beam and insert the plunger into the hole. In other words, a hydraulic lowering device can be constructed by drilling a hole in either the upper equalizer beam or the lower equalizer beam to serve as a cylinder, and inserting a plunger into the hole.

Furthermore, if the screw-type jack-up device 33 is not installed, there is no need to take into account that the bending moment due to the cross acts on the screw of the jack-up device 33, so it is possible to omit the lower equalizer beam. It is. In this case, a hole serving as a cylinder is bored in the upper equalizer beam, and a syringe is inserted into the hole.

As specifically explained with the above embodiments, according to the present invention, a hole is formed in the equalizer beam, this hole is used as a cylinder of a hydraulic lowering device, and a syringe is inserted into the hole to construct a hydraulic lowering device. This makes it possible to sufficiently increase the rigidity of the cylinder, eliminate distortion of the cylinder due to hydraulic pressure, improve control performance of A, G, and C, and make it possible to lower the overall height of the hydraulic lowering device and housing than before. can. Therefore, it is possible to provide inexpensive equipment by reducing the weight of the hydraulic lowering device and the housing. Furthermore, since the reduction device is embedded in the equalizer beam, it is possible to eliminate wear on the contact surface between the hydraulic reduction cylinder and the equalizer beam due to vibration during rolling, which is the case with conventional devices, resulting in improved operational stability. There are advantages such as improved productivity and reduced maintenance costs.

[Brief explanation of the drawing]

Figures 1 and 3 are block diagrams showing a conventional cross-roll rolling mill, Figure 2 is an explanatory diagram to explain how the work rolls cross each other, and Figure 4 is an embodiment of the present invention. FIG. 5 is a front sectional view showing this, and FIG. 5 is a side sectional view thereof. 21a, 21bLt")-rio-/l/, 22
a, 22b are work roll chocks, 23a, 23b are backup rolls, 24a, 24b are backup roll chocks, 30 a, 30 b G; j x : l life f
36 is a plunger, 37 is a hole, 38 is a cylinder cover, and 39 is a hydraulic lowering device. Patent applicant: Mitsubishi Heavy Industries, Ltd. Sub-agent Patent attorney: Shibu Mitsuishi (and 1 other person) Figure 1 5 Figure 2 16.17 16.17 Figure 3 Figure 4

Claims (1)

[Claims] A pair of backup roll chocks that rotatably support a work roll chock that rotatably supports a work roll and also rotatably support a backup roll that contacts the work roll, and a plate-shaped plate disposed in contact with the backup roll chock. In a cross-roll rolling mill equipped with an equalizer beam and a hydraulic rolling device that applies rolling edges to the back-angular chock through the equalizer beam, a hole that will become a cylinder is bored on the surface of the equalizer beam, and A hydraulic rolling device for a cross-roll rolling mill, characterized in that the hydraulic rolling device is constructed by inserting a plunger into this hole.