RU2389571C2 - Multi-purpose roll mill stand - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, namely to rolling and can be used to produce rails and H-sections. Proposed mill stand comprises two horizontal rollers, two vertical rollers fitted in C-like pads and mechanisms to move said rollers along and across rolling direction. Every horizontal roller is arranged in cartridge fitted in C-like pad fixed in lengthwise direction and can move along or across rolling direction. Note here that cartridge width in lengthwise direction is smaller than respective width pad by vertical roller axis travel.

EFFECT: displacement of vertical roller axes relative to plane of horizontal roller axes and displacement of vertical roller along or across rolling direction.

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Description

The invention relates to the field of rolling production and can be used in the manufacture of rails and I-sections.

Known designs of universal working stands, including two horizontal drive rolls installed in the pillows, and two vertical non-drive rolls installed in their pillows between the necks of horizontal rolls (see, for example, [1], 179-188, Fig. 56, 61 and 62, as well as [2], FIGS. 2 and 3), wherein the pillows of the vertical and horizontal rolls are installed in the stand frame so that the axes of the vertical and horizontal rolls are in the same vertical plane. Each pillow of a vertical roll is made in the form of a C-shaped frame (cartridge), in which a hollow bandage of a vertical roll is attached to the axis (see [1], Fig. 61, 62). This cushion, together with the roll, can be moved in the direction perpendicular to the rolling direction by means of pressure screws, to which it is pressed by the draft of a spring or hydraulic balancing device (see [2], item 46 in Fig. 3).

The disadvantage of this stand design is the inability to move the axes of the vertical rolls relative to the plane of the axes of the horizontal rolls in the rolling direction or against the rolling direction (along the rolling direction). At the same time, there are known methods for rolling rails [3, 4] and beams [5], along which it is necessary to move vertical rolls relative to the plane of the axes of the horizontal rolls in the direction of rolling by an amount, for example, 0.9-1.2 of the difference between the lengths of the deformation arcs heads and necks, which is 36-48 mm or more [3]. The lack of a mechanism for such a movement of vertical rolls does not allow to implement these rolling methods in industry.

The closest analogue, selected as a prototype, is the design of a universal rolling stand according to patent US 5.718.141 [6]. According to this patent, for moving vertical rolls along the rolling direction, screw (see [2], FIG. 2), wedge (FIGS. 5-7) or hydraulic (FIG. 8) devices are installed in the racks of the universal stand frame on both sides pillows and allowing to move the pillows together with vertical rolls in the direction or against the direction of rolling. With this movement of each cushion, the balancing thrust (see pos. 6 in Figs. 2, 5, 8), rigidly connected to the cushion and pressing the cushion to the pressure screw, experiences elastic bending in the direction of movement, and at the contact of the cushion with the end of the pressure screws friction slip.

The disadvantage of the prototype is the limited amount of movement of the pillow with a vertical roll, since the elastic bending of the balancing rod is permissible by a small amount (2-5 mm), and with the required movement of the vertical roll by 36-48 mm by the method [3] or 64-86 mm by the method of [4], this traction may break. In addition, the elastic bending of the traction and contact friction between the pillow and the ends of the pressure screws cause an increase in the force of movement of the pillow.

The objective of the present invention is to ensure the movement of the vertical roll in the direction or against the direction of rolling relative to the plane of the axes of the horizontal rolls by the amount necessary for rolling the rails according to the methods [3, 4], by eliminating the elastic bending of the balancing traction and eliminating contact friction between the pillow and the ends of the pressure screws. This problem is solved by the fact that in the known design of a universal rolling stand, comprising two horizontal rolls and two vertical rolls installed in C-shaped pillows, as well as mechanisms for moving vertical rolls along the rolling direction, each vertical roll is placed in a cassette, which is installed in a fixed in the longitudinal direction, the C-shaped pillow and can move in it in the direction or against the direction of rolling relative to the plane of the axes of the horizontal rolls, and the width sets in the longitudinal direction should be less than the corresponding width of the pillow by the amount of movement of the vertical roll.

The invention is illustrated by drawings in figures 1-4.

Figure 1 presents in perspective view the main elements of the vertical roll assembly during assembly. Figure 2 shows a perspective view of a General view of the node of the vertical roll. Figure 3 shows a horizontal section along the vertical rolls, and figure 4 is a vertical section along the axis of the vertical roll.

In these drawings, the following notation: 1 - vertical roll; 2 - cassette vertical roll; 3 - pillow vertical roll; 4 - hydraulic mechanism for moving the vertical roll cassette; 5 - stands of the stand stand; 6 - supporting beam pillows vertical roll; 7 - bolt connection of a pillow with a supporting beam; 8 - pressure screws of the mechanism for the transverse movement of the pillow of the vertical roll; 9 - thrust balancing pillows vertical roll; 10 - lower horizontal roll.

The vertical roller 1 is placed on the rolling bearings in the cassette 2, which is installed in a C-shaped pillow 3 and can be moved in it along the rolling direction using, for example, a hydraulic device 4 mounted in the rack 5. The pillow 3 is installed between the racks of the frame and rigidly connected to the support beam 6, which is pressed against the pressure screws 8 using rods 9 balancing device. Since the pillow is fixed from displacement along the rolling direction by the stands of the bed, the movement of the cartridge 2 with the vertical roller 1 occurs when the pillow is stationary (in this direction), which eliminates the elastic bending of the balancing rods and sliding friction between the ends of the pressure screws and the supporting beam 6.

Since hydraulic (or any other) mechanisms for moving the vertical roll cassette are installed in both racks of the bed, moving the cassette with the vertical roll is possible both in the direction and against the direction of rolling. In order to provide the amount of displacement of the vertical rolls required by the methods [3, 4] relative to the plane of the axes of the horizontal rolls, the width of the cassette D (see FIGS. 1 and 3) should be less than the width of the pillow B by the maximum possible amount of movement of the vertical rolls: as can be seen from FIG. .3 BD≥2Δ _max .

The magnitude of the displacement of the vertical rolls relative to the plane of the axes of the horizontal rolls is set according to the rolling methods of the rails. In particular, when implementing the method [3], the displacement in the rolling direction of the axis of the vertical roll, compressing the rail head, is Δ _g = (0.9 ÷ 1.2) · (l _g -l _w ), where l _g and l _w - the lengths of the deformation zones during compression of the rail head and neck, respectively; at the same time, the offset of the axis of the second roll, compressing the bottom of the rail, against the direction of rolling should be equal to Δ _p = (0.5 ÷ 1.5) · (l _w -l _p ), where l _p - the length of the deformation zone from the side of the sole.

It is advisable to use a hydraulic one as a mechanism for moving the cassette of vertical rolls, since it is the most compact and allows you to set the offset value of the vertical rolls remotely using automation.

During the operation of the proposed device, first, using the pressure screws 8, the cushion 3 is installed in a position providing the required sizes of the flanges (head and sole) of the rails. Then, by supplying fluid to the hydraulic cylinders 4, a predetermined offset of the left and right vertical rolls relative to the plane of the axes of the horizontal rolls is set, after which the profile is rolled. If necessary, the reverse rolls establish a new position of the pillows and cassettes of vertical rolls and produce rolling in the opposite direction.

The technical result of the application of the invention is the possibility of using in industry new methods of rolling rails and I-sections according to [3, 4, 5].

INFORMATION SOURCES

1. Gritsuk N.F., Antonov S.P. Production of wide-shelf I-beams. - M.: Metallurgy. 1973.

2. United States Patent 3.805.572. B21b 31/08, 04/23/1974.

3. A.C. USSR 1225622. B21B 1/08. 04/23/86. Bull. No. 15.

4. A.S. USSR 944686. B21B 1/08. 07/23/82. Bull. Number 27.

5. United States Patent 5.203.193. B21b 1/08, 04/04/1991.

6. United States Patent 5.718.141. B21B 13/10, 04/04/1991.

Claims (1)

A universal rolling stand containing two horizontal rolls with pillows and two vertical rolls installed in C-shaped pillows, mechanisms for moving vertical rolls along the rolling direction, characterized in that each vertical roll is placed in a cassette, which is mounted in a longitudinally fixed C- shaped pillow with the ability to move in it in the direction or against the direction of rolling relative to the plane of the horizontal rolls, and the width of the cartridge in the longitudinal direction is less e of the corresponding width of the pillow by the amount of displacement of the axis of the vertical roll.

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