JPH10216819A - Guide device for block mill, block mill, and method for rolling wire rod or wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the rolling of the wire rod or the wire without causing tilt, seizure and disconnection by providing in the guide device plural sets of guide rollers for bundling materials to be rolled, which are moved in following up to the materials to be rolled during rolling. SOLUTION: The wire 12 that the diameter of the wire rid, etc., rolled by rolls in a preceding stage is >=4mm, enters guide rollers 4 in the guide device A. The guide rollers 4 become a state coming into contact with the wire 12 very lightly or a state just before coming into contact with it, and the wire 12 advances further and reaches guide rollers 5. Next, the movements of main arms 7 on the guide rollers 5 side are transmitted to the main arms 7 on the guide rollers 4 side via pivots 6. The main arms 7 on the guide rollers 4 side are lowered to the wire 12, and the support of arm bases 11 and the bonding of the wire 12 by the guide rollers 4 and 5 are started. By this series of movements, the occurrence of misroll caused by an accident that the wire 12 is caught on the inlet side on the guide rollers 4 side, is prevented, and guiding, supporting and bundling can be performed most suitably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide device for a block mill,
(Also referred to as "wires, etc."). More specifically, a wire rod or the like having a diameter of 4 mm or less is dropped,
The present invention relates to a block mill guide device and a block mill capable of rolling without seizure or disconnection, and a rolling method capable of rolling the wire or the like without falling, seizing or disconnection.

[0002]

2. Description of the Related Art For rolling a wire or a wire, for example, a rolling equipment having a configuration in which rolling mills having rolling rolls engraved with holes such as "dia-square" and "oval-round" are arranged in series is used. It is performed using. In this case, the interval between the rolling rolls forming a set in each rolling mill is adjusted so as to gradually decrease as rolling progresses. Therefore, it is necessary to provide a guide device for accurately guiding a material to be rolled, such as a wire, to a roll in a normal posture on the entry side of each rolling mill.

For this type of guide device, during rolling,
It is required that the guide surface is always kept parallel to the material to be rolled, such as a wire, which is a reference rolling line. Furthermore, the gap between the guide surface and the material to be rolled is required to be adjusted to a minimum necessary size so that the material to be rolled can be easily guided to a rolling roll (hereinafter, also simply referred to as a "roll").

[0004] However, if the gap between the guide surface and the material to be rolled is too small, the rolled material or the like as a material to be rolled hits the guide surface due to a change in the rolling dimension of the material to be rolled by adjusting the roll interval. , Misrolling is likely to occur.

[0005] For this reason, in the actual operation, giving the highest priority to the prevention of misroll, the gap between the guide surface of the guide device and the material to be rolled has a margin in consideration of the diameter of the wire to be rolled. The dimensions are taken. However, when the size of the material to be rolled by the previous roll is smaller than a predetermined value, the gap between the guide surface of the guide device of the next roll and the material to be rolled becomes too large, and the roll-over occurs. This may cause a misroll. In particular, with respect to a material to be rolled such as a small-diameter wire having a diameter of 4 mm or less before entering a rolling roll (before rolling), the size of the material to be rolled by the roll immediately before the roll is smaller than a predetermined value. If it is excessively large, the gap between the guide surface of the guide device of the roll and the material to be rolled becomes too large, and the roll frequently occurs.

[0006] In the case of rolling using a small-diameter wire rod or the like having a diameter of 4 mm or less as a material to be rolled, the following three types of guide devices (a) to (c) have conventionally been used. Was. In addition, as a type of a rolling mill, a block mill of a three-way roll or a four-way roll is often used, in particular, in order to obtain a good cross-sectional shape.

(A) A guide device for guiding a material to be rolled to the vicinity of a rolling roll so that the material to be rolled such as a wire does not deviate from a rolling line of a rolling mill, which is a so-called solid guide device. FIG. 5 shows an example of this guide device.

(B) A movable mechanism is provided at the tip of a solid guide device as shown in FIG. 5, and a material to be rolled such as a wire is sandwiched by a guide to increase the binding force and suppress the material to be rolled from falling. Movable solid guide device. FIG. 6 shows an example of this guide device.

(C) A roller guide device is provided in front of (incoming side of) the solid guide device as shown in FIG. 5 or the movable solid guide device as shown in FIG. What is called a so-called "combination guide device" that increases the restraining force to suppress the fall and accurately guides the material to be rolled to the rolling rolls. FIG. 7 (FIG. 7 (b) is a front view, and FIG. 7 (a) is a left side view thereof) shows an example of this guide device.

However, the guide devices of the above-mentioned types (a) to (c) have the following problems (i) to (iii), respectively.

(I) In the solid guide device as shown in FIG. 5, the shape of the tip is fixed. Therefore, when a material to be rolled having a size (diameter) larger than the designed shape enters the guide, seizure or misroll occurs. Conversely, when a material to be rolled having a size smaller than the design shape enters the guide, the binding force on the material to be rolled is reduced, and the roll is likely to fall.

(Ii) In the case of a movable solid guide device as shown in FIG. 6, since the leading end of the guide is movable, the space between the material to be rolled and the guide as in the solid guide device described in (i) above is used. There is no problem due to the gap. However, since the material to be rolled and the leading end of the guide are always in metal contact, it is necessary to continue forced lubrication such as spraying a lubricant on the material to be rolled. Without forced lubrication, seizure occurs between the guide and the material to be rolled.
For this reason, the material to be rolled may be disconnected or a misroll may occur.

(Iii) In a combination guide device as shown in FIG. 7, a material to be rolled is constrained on the entry side of rolling by using a guide roller. Therefore, even if the size of the guide portion of the solid guide device or the movable solid guide device is relatively large, the material to be rolled can be easily guided to the rolling roll. Furthermore, compared to the case where the solid guide device or the movable solid guide device is used alone, the effect of adding the roller guide device to the above guide device can increase the restraining force on the material to be rolled, thereby suppressing the falling. Is big. However, since the roller guide device is attached to the front (entrance side) of the solid guide device or the movable solid guide device, the distance between the guide roller of the roller guide device and the rolling roll becomes longer. For this reason, the to-be-rolled material may be twisted between the guide roller and the roll, and may fall, leading to disconnection or misrolling.

Japanese Patent Application Laid-Open No. 6-47424 discloses that a material to be rolled is always conjugated from a front end to a rear end with a constant holding force by using hydraulic pressure, and the material to be rolled is accurately guided to a rolling roll. In addition, there is disclosed a "rolled material guiding method and a roller guide device" capable of accurately detecting a timing at which a material to be rolled is caught by a guide roller. The technique proposed in this publication is considered effective when hot rolling a wire having a diameter of more than 4 mm, particularly a wire having a diameter of 5.5 mm or more. However, since the roller pressure device is used, the roller guide device itself becomes large. For this reason, in a rolling mill using a small-diameter wire rod or the like having a diameter of 4 mm or less as a material to be rolled, that is, rolling using a block mill, there is no space for installing the roller guide device, and it is difficult to apply.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and is intended to roll a wire or a wire having a diameter of 4 mm or less without rolling, seizing or breaking. It is an object of the present invention to provide a block mill guide device and a block mill that can be used. It is a further object of the present invention to provide a rolling method capable of rolling the wire or the like without causing collapse, seizure or disconnection.

[0016]

The gist of the present invention resides in a guide device for a block mill shown in (1), a block mill shown in (2), and a wire or wire rolling method shown in (3).

(1) A guide device for guiding a material to be rolled having a diameter of 4 mm or less to an entrance of a rolling roll of a block mill, wherein the material to be rolled moves in the guide device following the material being rolled. A guide device for a block mill, comprising a plurality of sets of guide rollers for restraint.

(2) A block mill for rolling a material to be rolled having a diameter of 4 mm or less, the block mill comprising the block mill guide device described in (1) above.

(3) A wire or wire rolling method characterized by rolling using the block mill described in (2) above.

Here, the term "wire" refers to a metal material which is hot-rolled into a bar shape, and is a steel material cut to a predetermined length or a coil-shaped steel material. The term “wire” refers to a wire that is mainly cold-worked, such as drawn, and wound into a coil.

The block mill according to the present invention may be any type of mill such as a two-way roll, a three-way roll and a four-way roll.

The above-mentioned "rolled material having a diameter of 4 mm or less" means, in the case of a material to be rolled having a circular cross-section, a material having a diameter of 4 mm or less literally, and a material having a non-circular cross-sectional shape. In the case of a rolled material, it refers to a material to be rolled whose circumscribed circle has a diameter of 4 mm or less as shown in FIG.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present inventors have conducted various studies on a guide device for a block mill (hereinafter, also simply referred to as a "guide device"). As a result, first, the following items were found.

When a guide roller is used in the guide device, the contact between the guide and the material to be rolled is rolling contact. For this reason, seizure is less likely to occur, and unlike the above-described solid guide or movable solid guide in which the guide and the material to be rolled make metal contact, it is necessary to necessarily forcibly spray the lubricant onto the material to be rolled. There is no.

Next, in the guide device, a plurality of sets of guide rollers that move following a wire or the like as a material to be rolled during rolling, that is, a rolled material having a function of automatically adjusting the constraint of the material to be rolled. It has been found that providing a plurality of sets of guide rollers for material restraint has the following effects.

[0026] Even if the dimension of the wire rods at the leading and trailing ends is increased or the dimensional change is caused by the temperature change during rolling, the material to be rolled can be constrained by the guide rollers during rolling. Can be suppressed.

The torsion of the material to be rolled can be suppressed.
For this reason, it is also possible to prevent the rolled material from falling due to torsion.

Therefore, in the above-described guide device in which a plurality of guide rollers are provided in the guide device, a mechanism in which the plurality of sets of guide rollers always follow the material to be rolled in order to restrain the material to be rolled. That is, a mechanism for automatically adjusting the restraint of the material to be rolled during rolling was examined, and the following findings were obtained.

In rolling using a block mill in which the installation space for the guide device is extremely narrow, seizure between the guide roller and the material to be rolled and large deformation of the material to be rolled are prevented. In order to constantly restrain the material to be rolled by the guide roller following the movement of the material to be rolled, for example, a binding force of a so-called “elastic body” such as a spring or rubber may be used.

FIG. 1 shows that a spring is used as the elastic body to move the guide roller so as to follow the material to be rolled, that is, to automatically adjust the constraint of the material to be rolled during rolling. FIG. 3 is a view showing an example of a guide device according to the present invention using a binding force of springs 9 and 10;

Two sets of guide rollers 4 and 5 have springs 9 and 10
The main arm 7, the second arm 8 and the guide sleeve 3 are connected to each other by a mechanism, and the connecting portion of the main arm 7 becomes a pivot 6 so that the guide rollers 4 and 5 move like a pendulum. It has become.
Therefore, the guide rollers 4 and 5 can move following the rolled material 12 being rolled, such as a wire. Also, the pivot 10 is attached by the spring 10 attached to the main arm 7.
A force always acts on the guide rollers 4 and 5 around the center 6 in the direction of the center between the guide rollers 4 and 5, that is, the direction of the rolling pass line in which the roll 1 closes with respect to the material 12 to be rolled. Therefore, even if the dimensions of the material to be rolled 12 change during rolling, the spring 9 and the main arm 7 and the second arm 8
, The guide rollers 4 and 5 can automatically follow the material to be rolled 12, and the material to be rolled 12 is always restrained by the guide rollers 4 and 5. Furthermore, since the springs 9 and 10 are used for restraining, there is no need to apply a large force such as plastic deformation or seizure between the guide rollers 4 and 5 and the material 12 to be rolled, thereby preventing the occurrence of surface flaws. it can.

The present invention has been completed based on the above findings.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows an example of a configuration diagram of a guide device for a block mill according to the present invention. Guide device A shown here
Is composed of a guide mounting part 2, a guide sleeve 3, guide rollers 4, 5, a pivot 6, a main arm 7, a second arm 8, a spring 9 (a pressure spring), a 10 (a support spring), and an arm base 11. .

FIGS. 2 and 3 show the guide device A shown in FIG.
Fig. 3 schematically shows a state in which the device operates. FIG. 4 shows a state diagram when the block mill guide device of the present invention is mounted on a block mill. FIG. 4 exemplifies a case in which two sets of the guide rollers shown in FIG. 1 are attached. The guide device A is incorporated into the rolling mill housing 13 via the guide mounting portion 2.

As shown in FIGS. 1 to 3, a rolled material 12 having a diameter of 4 mm or less, such as a wire rod rolled by the preceding roll, passes through an entrance of the guide device A and is guided by a guide roller 4 in the guide device A. Come in. Before the material to be rolled 12 enters the guide roller 4, the spring 10 is attached to the arm (the main arm 7 and the second arm 8) on the guide roller 5 side. Conversely, the gap between the rollers 4 is open.
When the material to be rolled 12 enters the guide roller 4, the guide roller 4 is brought into a state of being very lightly in contact with the material to be rolled 12 or in a state immediately before the contact, and the material to be rolled 12 further advances and reaches the guide roller 5. I do. Next, at the same time when the material to be rolled 12 enters the guide roller 5, the movement of the main arm 7 on the guide roller 5 side moves via the pivot 6 to the guide roller 4.
To the main arm 7 on the side. And the guide roller
The main arm 7 on the fourth side is lowered to the material 12 to be rolled, and the support and restraint of the material 11 to be rolled by the guide rollers 4 and 5 are started. By this series of operations, it is possible to prevent the occurrence of a misroll due to the rolled material 12 colliding on the entry side of the guide roller 4, and it is possible to optimally guide, support, and restrain the rolled material 12.

Even if the size of the material to be rolled 12 changes during rolling, the positions of the guide rollers 4 and 5 can be adjusted by the pivot mechanism and the arm (the main arm 7 and the second arm 8), so that the material to be rolled is always kept in an optimum state. The rolled material 12 can be guided, supported, and restrained.

The above-mentioned supporting and restraining functions schematically shown in FIG. 3 can prevent the occurrence of a shape defect due to rolling or rolling that tends to fall, and can perform rolling without seizure or disconnection.

The guide device for a block mill according to the present invention is a conventional guide device (solid guide device, movable solid guide device and combination guide device).
It can be easily obtained by processing and assembling the same material (for example, JIS SKD61 or the like) and an elastic body such as a spring or rubber. The guide roller may be made entirely of the same material, or may be made by combining a different material into a roller portion requiring hardness and a rim portion not requiring hardness.

Hereinafter, the present invention will be described in more detail with reference to examples.

[0041]

EXAMPLE A normal hot wire rolling and a normal block mill rolling were performed to obtain a 3.8 mm diameter wire made of SWRS82A shown in Table 1 as a material steel.

[0042]

[Table 1]

Next, using the above-mentioned wire having a diameter of 3.8 mm as a material to be rolled, a diameter of 1.1 to 3.1.
Rolled to 0 mm. As the guide device in this case, the guide device according to the present invention shown in FIG. 1 or the ordinary solid guide device shown in FIG. 5 was used.

The guide device according to the present invention has already been described. That is, each arm base 11 has two
A main arm 7 of the book is attached, and a guide roller 4 or 5 for guiding the material 12 to be rolled is provided at the tip of the main arm 7. Each of the main arms 7 is provided with a second arm 8 for two guide rollers 4 and 5 to perform the same movement in conjunction with each other.
The second arms 8 of the book are connected to each other. The force (pressing) the material 12 to be rolled 12 by the guide rollers 4 and 5 via the main arm 7 and the second arm 8 by the spring 9 (pressure spring) provided at the connection between the main arm 7 and the second arm 8. Occurs. The main arm 7 on the guide roller 5 side is connected to the guide sleeve 3 by a very soft spring 10 (support spring).
The guide roller 4 is slightly above the pass line centering on the pivot 6 until it enters the guide roller 4 in the guide device, and the guide roller 5 is slightly below the pass line (see FIG. 2). When the material to be rolled 12 enters the guide roller 4, it advances in a state of being very lightly in contact with the guide roller 4 or in a state immediately before the contact. As soon as the material to be rolled 12 reaches the guide roller 5, the main arm 7 and the second arm 8 connected to the guide roller 5 start moving. At the same time, the main arm 7 and the second arm 8 of the guide roller 4 center on the pivot 6 and start pressing the material 12 to be rolled. As a result of this,
Not only the guide roller 5 but also the guide roller 4 is restrained by the rolled material 12. It is to be noted that this restraining action occurs almost simultaneously at the guide rollers 4 and 5.

When rolling was performed to a diameter of 1.1 to 2.4 mm by a block mill equipped with an ordinary solid guide device, a large fall occurred. In addition, when rolling to a diameter of 3.0 mm, falling occurred.

On the other hand, when rolling was performed to a diameter of 1.1 to 3.0 mm by a block mill provided with the guide device according to the present invention, no collapse occurred. Furthermore,
No seizure occurred.

[0047]

According to the guide device for a block mill of the present invention, twisting and falling of a wire or a wire which is a material to be rolled having a diameter of 4 mm or less can be suppressed. It can be prevented from undergoing plastic deformation. Therefore, if rolling is performed using a block mill provided with the guide device of the present invention, the rolling can be performed without falling down on the material to be rolled and without causing seizure or disconnection. Furthermore,
In the guide device according to the present invention, since the follow mechanism of the guide roller to the material to be rolled is extremely simple,
Maintenance and maintenance of the guide device is easy.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an example of a block mill guide device of the present invention.

FIG. 2 is an explanatory view showing a state until a material to be rolled enters a rear guide roller in the guide device for a block mill of FIG. 1;

FIG. 3 is an explanatory diagram showing a state immediately after a material to be rolled reaches a rear guide roller in the block mill guide device of FIG. 1;

FIG. 4 is a diagram showing an example of a case where the block mill guide device of the present invention is attached to a block mill.

FIG. 5 is a view showing a solid guide device.

FIG. 6 is a view showing a movable solid guide device.

FIG. 7 is a diagram showing a combination guide device.
(A) is a left side view, and (b) is a front view.

FIG. 8 is a diagram showing an example of a cross-sectional shape of a material (rolled material), a circumscribed circle of the material, and a cross-sectional shape after rolling when rolling is performed into a circle (a cross section is a circle) using a three-way roll.

[Explanation of symbols]

 A: Guide device 1: Roll roll, 2: Guide mounting part 3: Guide sleeve 4: Guide roller 5: Guide roller 6: Pivot 7: Main arm 8: Second arm 9: Spring (pressure spring) 10: Spring (support) Spring) 11: Arm base 12: Wire 13: Rolling mill housing

Claims (3)

[Claims] A guide device for guiding a material to be rolled having a diameter of 4 mm or less to an entrance of a rolling roll of a block mill,
A guide device for a block mill, comprising a plurality of sets of guide rollers for restraining a material to be rolled which follow the material being rolled in the guide device. 2. A block mill for rolling a material to be rolled having a diameter of 4 mm or less, comprising a guide device for a block mill according to claim 1. 3. A method for rolling a wire or wire using the block mill according to claim 2.