JP3315643B2 - Screw type rolling down machine and 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 screw-type rolling reduction device and a rolling mill, and more particularly to a screw-type rolling reduction device which can be suitably used for rolling, in which lubricating oil does not adhere to a material to be rolled, such as dry temper rolling. Device and rolling mill.

[0002]

2. Description of the Related Art Rolling mills are mainly used in the production process of metal strips such as steel strips, and are roughly classified into an electric rolling type and a hydraulic rolling type according to a rolling reduction method. Generally, an electric rolling mill is provided at a screw tip receiving portion for a screw to be pressed down at a screw tip and a screw-down mechanism including a screw and a nut provided at an upper portion of a housing (hereinafter, also simply referred to as a “screw”). And a screw block having a pressure block. Pressure block upper end and screw tip (lower end)
In order to average the hits and disperse the load under the rolling, usually, both have a planar shape, or one has a convex shape and the other has a concave shape. The object to be pressed is a roll chock of an upper backup roll or a quick open liner of a quick open mechanism described later.

[0003] Electric rolling mills have advantages such as easier maintenance of equipment than hydraulic rolling mills.
For example, it is often used in temper rolling, that is, cold rolling in which a cold-rolled steel strip after annealing is subjected to shape and surface finishing, hardness adjustment, and the like. FIG. 7 is a front view showing an example of a quadruple cold rolling mill having a quick open mechanism. Reference numeral 1 denotes a bed plate, 2 denotes a housing, 3 denotes a work roll, and 4 denotes a roll chock of an upper backup roll. , 5
Is a quick-open mechanism, 6 is a screw down screw (screw), 7 is a nut, and 8 is a screw down drive mechanism.

The work roll 3 is frequently replaced for quality control. However, even when a roll changer is used, or when the roll is changed by a so-called C hook using an overhead crane, the work roll 3 is lifted from the upper and lower backup rolls. It is necessary to take out and put in the direction of the roll axis in the rolled state, but in a rolling mill of the electric reduction type, the screw itself is rotated and moved in the direction of the rotation axis. It takes a long time, and the time required for the entire roll change becomes longer.

For this reason, what is called a quick open mechanism has been developed. FIG. 8 is a plan view showing one half of the quick open mechanism. There are a total of two screw screws for the operation side and the drive side. The quick open frame 51 is suspended by engaging with the necks at the tips of the two screw screws. The quick open frame 51 has a long plate shape, and a window is provided at a position corresponding to the screw.
52 is a sliding rail. A pressure block (block) 53 is placed at the center of the quick open liner 52 where the screw contacts. The quick open liner 52 can be moved by the opening / closing cylinder 54 from a position immediately below the screw shown in (a) to an outer position shown in FIG.

At a position immediately below the screw, the quick open liner 52 is inserted between the upper backup roll chock and the screw together with the block 53 to transmit the rolling force. When changing rolls, first raise the screw slightly to loosen the pressure, then release the quick open liner 52 to the outside position, and almost instantly adjust the quick open liner 52 and pressure block 53 by operating the cylinder. Thickness, e.g. 100-15
Since the result is the same as that of the screw rising by 0 mm, the upper backup roll can be immediately lifted by a roll balance mechanism (not shown) and the work roll can be taken in and out, so the screw down mechanism is actuated to raise the screw greatly, The time required for changing the roll is greatly reduced as compared with the case of lowering the roll. FIG. 6 is a sectional view showing an inserted state of the quick open mechanism.
6b is a shaft part (neck part) and 6c is a tip part.

[0007]

The temper rolling includes wet rolling in which a temper rolling oil is injected onto a sheet surface and dry rolling in which no rolling oil is used.
When applying the electric rolling mill to dry temper rolling,
The oil lubricating between the screw and the nut travels between the screw and the nut, drops from the tip of the screw onto the pressure block, and accumulates there. When the backup roll is lifted during the roll change, the lower end of the screw hits (abuts) the pressure block, so that the oil accumulated on the pressure block is pressed by the lower end of the screw and scatters. Since the rolling oil is used in the cold rolling step and the wet pass rolling step, the above-mentioned scattering of the oil is not a problem, but in the dry pass rolling step, the oil scattered on the plate surface may have a streak pattern or the like. Generate defects.

In order to prevent such scattering of oil, it is possible to take measures such as forming a wall on the upper surface of the roll chock of the backup roll so as to surround the screw. However, since the space immediately above the roll chock is closed by the wall, there is no room for inserting the quick open mechanism. In addition, if the contact between the screw and the pressure block is strong, the lubricating oil may scatter over the wall, so that this measure cannot be said to be sufficient.

In view of the above-mentioned problems of the prior art, the present invention provides a screw-type pressing device and a rolling mill in which oil accumulated on the pressure block does not scatter even if the pressing screw hits the pressure block during roll change. Aim.

[0010]

SUMMARY OF THE INVENTION The present invention is directed to a screw-type screw-down method in which the tip of a screw down screw held by a nut fixed to a housing is brought into contact with a pressure block fixed to a load object in a housing to reduce the pressure object. A first aspect of the present invention is a screw-type screw-down device, wherein the pressure block and the screw are in contact with each other with a contact area of 20% or less of a cross-sectional area of a shaft portion of the screw (first invention).

[0011] It is preferable that the pressure block side of the pressure block facing the screw is convex (second invention). Preferably, the pressure block has a groove for draining oil on the side of the pressure block opposite to the screw (third invention). Further, the present invention provides a screw-type screw down device that lowers the object to be pressed by bringing the tip of the screw down held by a nut fixed to the housing into contact with a pressure block fixed to the object to be pressed in the housing. A screw-type screw down device having an oil drain groove on the opposite side (a fourth invention).

In addition, the screw type screw down device (first to first)
The fourth invention) preferably further has an oil receiver surrounding the shaft portion of the screw down (fifth invention). When the pressure block is fixed to the object to be pressurized, it is sufficient that the pressure block is easily inserted into and removed from a depression provided in the object to be pressed. Further, the present invention provides the screw type screw down device (first
To a fifth invention) (a sixth invention). This mill is suspended by a screw
Snap along the fastened open frame (51)
Open liner (52) and pressure block
It is preferable to have a quick open mechanism that allows (53) to be moved from a position immediately below the screw (seventh invention).

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing a main part of a screw type screw down device. In FIG. 1, reference numeral 4 denotes an object to be pressed (roll chock), and the object to be pressed 4 is mounted on a housing (not shown). A pressure block (block) 9 is fixed (fitted) to the upper end of the object 4, and a screw 6 is disposed above the object 4. The screw 6 has a screw portion 6a, a shaft portion 6b, and a tip portion 6c from the center to the end in the axial direction.
The tip 6c is arranged so that the shaft is vertical and the tip 6c is located directly above the block 9 in the state where the object to be pressed is mounted. The screw portion 6c is held by a nut (not shown), and the nut is fixed to a housing (not shown).

According to the present invention, in such a screw type drafting apparatus, the screw 6 and the block 9
The contact area is not more than 20% of the cross-sectional area of the shaft part, or an oil drain groove is provided on the surface of the block that contacts the screw 6. That is, when limiting the contact area, as shown in FIG. 2, the cross-sectional area of the shaft of the screw 6 is A, and the area (contact area) of the designed contact portion 10 between the block 9 and the screw 6 is B. When the ratio B /
The value of A should be 0.2 (20%) or less. In FIG. 2, the screw portion and the tip portion of the screw are not shown.

Thus, when the tip of the screw contacts the block, it is possible to preferably prevent the oil on the block from being squeezed and scattered. If B / A> 0.2, the effect of preventing oil scattering cannot be obtained. In addition, B / A ≦
A value of 0.1 (10%) is preferable because the effect of preventing oil scattering is further increased. In the point contact state, B / A = 0. In calculating and measuring the contact area, it is not necessary to consider the deformation due to the rolling force.

FIG. 3 is a sectional view showing an example of a combination of a pressure block and a screw satisfying the requirements of the present invention.
(A) is a flat screw at the lower end of the screw, a convex curved surface (abbreviated as flat / convex curved surface) at the upper end of the block, (b) is a convex curved surface / convex curved surface, (c) is a concave curved surface / convex curved surface, and (d) is a convex curved surface. / Flat curved surface, (e) flat / convex curved surface with groove (or depression),
(F) shows a combination of a plane / plane (corresponding to the upper end face of a truncated cone or a truncated pyramid). The center axes of the screw and the block are arranged on the same straight line in design so as not to hit each other, and the center of the contact portion is made to coincide with the center axis as much as possible.

Of these, (a), (b), (c),
As shown in (e) and (f), it is more preferable that the upper end of the block has a convex shape because the dripped oil can easily escape from the contact portion 10. (C) is a mode in which stability of contact is emphasized, and (e) is a mode in which a groove or a dent for oil escape is provided at the tip of the screw in (a).

FIG. 4 is a schematic view showing an example in which a groove is provided in the upper part of the block. (A) shows eight grooves 11 radially from the center.
This is an example in which is provided. By providing such a groove,
The dropped oil is easily discharged from the contact portion. The number of grooves is not particularly limited, but is preferably 6 to 12. The shape and depth of the groove are not particularly limited. (B)
This is an example in which the groove shape and arrangement of FIG. 3A are used in combination with the configuration of the flat / convex curved surface of FIG. 3A, and the effect of preventing oil scattering can be further enhanced. (C) is an example in which a flat / convex curved surface configuration is used together as in (b), but three grooves 11 are radially provided only around the outer periphery of the contact portion 10 with emphasis on contact stability. is there.

In the present invention, as shown in FIG. 5, it is preferable to surround the shaft 6b of the screw 6 with an oil receiver 55. Reference numeral 56 denotes a seal, and 57 denotes an oil discharge pipe.
The same or corresponding parts are denoted by the same reference numerals and description thereof is omitted. As a result, the amount of oil dripping can be reduced, so that the amount of oil scattering can be further suppressed. By providing the rolling mill with the screw type drafting device of the present invention,
Oil scattering on the material to be rolled by the rolling mill is prevented, and the occurrence of surface defects such as stripes on the product can be effectively suppressed. And since the screw type screw down device of the present invention does not block the upper space of the roll chock, a quick open mechanism can be attached to a rolling mill provided with the same, so that the roll change work time is greatly reduced. Can be shortened.

In this case, as shown in FIG. 5, the quick open liner 52 also corresponds to the object to be pressed according to the present invention.
The screw 6 is brought into contact with the screw 6 with a contact area of 20% or less of the axial cross-sectional area of the screw 6, or a groove for draining oil is provided on the surface of the pressure block 53 that contacts the screw 6.

It goes without saying that the present invention can be applied not only to dry temper rolling but also to wet pass rolling.

[0022]

[Embodiment] FIG. 7 used in a dry temper rolling mill
The present invention was applied to a rolling mill having the form shown in FIG. Conventionally, this rolling mill had a quick open mechanism as shown in FIG. 6, the contact area between the screw 6 and the pressure block 53 was almost equal to the screw shaft portion, and there was no oil receiver in the screw shaft portion. Also, the same pressure block as on the quick open liner was provided at the upper end of the upper backup roll. In this conventional rolling operation, the occurrence rate of defective coils due to the stripe pattern was about 10%.

On the other hand, according to the present invention, the reduction screw has a flat end and a shaft diameter of 500 mmφ, and the pressure block (both on the roll chock and on the quick open liner) has a diameter of 600 mmφ and an upper end of R3000 mm. When operated as a convex shape (design contact area is zero),
The defective coil occurrence rate was reduced to about 0.3%. Furthermore, the width belonging to the form of FIG.
Operation with eight grooves of 10 mm and 6 mm depth reduced the defective coil incidence rate to about 0.1%.

Further, when the operation was performed by providing an oil receiver of the form shown in FIG. 5 on the screw shaft portion, the defective coil generation rate was 0.0%, and the generation of streak patterns in the product could be completely prevented. 4 (a), 8 mm to 15 mm (8 mm at the center of the plane, 15 mm at the periphery, and the bottom of the groove is inclined) belonging to the form shown in FIG. After installation and operation, the incidence of defective coils was reduced to about 0.5%.

Further, when the operation was performed by providing an oil receiver of the form shown in FIG. 5 on the screw shaft portion, the defective coil occurrence rate was 0.1%, and it was possible to prevent the product pattern from being generated.

[0026]

As described above, according to the present invention, even if the pressing screw hits the pressure block during the roll change, the oil accumulated on the pressure block does not scatter, so that the product has no streak pattern defect and the quality is improved. Since the mounting of the open mechanism is not hindered, there is an excellent effect that the efficiency of roll changing operation does not decrease and the productivity is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a main part of a screw type screw down device.

FIG. 2 is a schematic view showing a contact state between a screw and a pressure block according to the present invention.

FIG. 3 is a sectional view showing an example of a combination of a pressure block and a screw satisfying the requirements of the present invention.

FIG. 4 is a schematic view showing an example in which a groove is provided in an upper portion of a block.

FIG. 5 is a sectional view showing an example in which an oil receiver is provided on a screw shaft portion.

FIG. 6 is a sectional view showing an inserted state of the quick open mechanism.

FIG. 7 is a front view showing an example of a quadruple cold rolling mill having a quick open mechanism.

FIG. 8 is a plan view showing one half of a quick open mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bed plate 2 Housing 3 Work roll 4 Workpiece under load (roll chock) 5 Quick open mechanism 6 Screw down screw (screw) 6a Screw part 6b Shaft part 6c Tip part 7 Nut 8 Pressure reduction drive mechanism 9,53 Pressure block (block) 10 Contact Part 11 Groove 51 Quick open frame 52 Pressure object (quick open liner) 54 Opening / closing cylinder 55 Oil receiver 56 Seal 57 Oil drain pipe

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takaaki Kobashi 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Corporation Chiba Works (56) References JP-A-6-15320 (JP, A) JP-A Sho 55-40081 (JP, A) Japanese Utility Model 5-50105 (JP, U) Japanese Utility Model 61-17209 (JP, U) Japanese Utility Model 58-76307 (JP, U) Japanese Utility Model 53-69426 (JP, U) U) Japanese Utility Model Showa 54-9126 (JP, U) Japanese Utility Model Showa 54-5030 (JP, U) Japanese Patent Publication No. 46-17886 (JP, B1) (58) Fields surveyed (Int. Cl. ⁷ , DB name) ) B21B 31/24 B21B 31/22

Claims (7)

(57) [Claims] In a screw type screw down device for lowering an object to be pressed by bringing a tip of a screw down held on a nut fixed to a housing into contact with a pressure block fixed to an object to be pressed in a housing, a pressure block and a screw are provided. Is the cross-sectional area of the shaft of the screw.
%, Wherein the contact area is not more than 0.1%. 2. The screw-type screw-down device according to claim 1, wherein the pressure-block-side of the pressure block facing the screw is convex. 3. The screw-type screw down device according to claim 1, wherein the pressure block has a groove for draining oil on a side of the pressure block opposite to the screw. 4. A screw type rolling device in which a tip of a screw down screw held by a nut fixed to a housing is brought into contact with a pressure block fixed to a screw down object in the housing to reduce the pressure down object. A screw type screw down device having a groove for draining oil on the side. 5. The screw-type screw down device according to claim 1, further comprising an oil receiver surrounding the shaft portion of the screw down. 6. A rolling mill provided with the screw-type screw down device according to claim 1. 7. A quick hang suspended by a reduction screw.
Quick open line along the open frame (51)
Screw ina (52) and pressure block (53)
7. The rolling mill according to claim 6 , further comprising a quick open mechanism that can be moved from a position immediately below .