JPH05201U - 4-roll tandem rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] It is easy to replace the roll housing,
Provided is a 4-roll tandem rolling mill capable of high speed rotation. [Structure] A cradle 5 on which the roll housing 1 is mounted is slidably mounted on a main body frame 4 of each stand for each roll housing in a direction orthogonal to a pass line, and a cylinder 7 for sliding the cradle 5 is provided. It is installed between each cradle 5 and the body frame 4. When the roll housing is slid, a gap is created between the roll housing and the adjacent roll housing, so that the lifting work can be roughly performed. Further, the detachable coupling 11 has a small axial expansion / contraction stroke, and can have a structure in which the body length is short and vibration does not easily occur even at high speed rotation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a 4-roll tandem rolling mill. In the rolling of wire rods with a relatively small diameter, billets obtained by slab rolling or continuous casting are sequentially rolled by a group of rough rolling mills, a group of intermediate rolling mills and a group of finish rolling mills, and then by wire drawing in another process. The wire is obtained by gradually reducing the diameter. There are various methods such as a die method for this wire drawing process, but in recent years, a 4-roll tandem rolling machine has been developed, which has advantages such as high-speed production of products with good external dimension accuracy and prevention of material twisting. (For example, JP-A-63-168202 and JP-A-1-88845).

This 4-roll tandem rolling mill forms a circular hole shape on the pass line by disposing four hole type rolls around the pass line, and a rolling stand incorporating such a hole type roll. Are arranged in tandem so that the size of each circular hole die gradually decreases, and at least one hole roll is driven to rotate at each rolling stand to feed the wire rod, and the wire rod is continuously rolled by the circular hole die. ing. Also, the phases of the rolls are made different between adjacent rolling stands so that the non-contact portions of the wire due to the gap between the four rolls forming the circular hole shape do not match in the adjacent rolling stands. A horizontal stand with a horizontal axis (henceforth, horizontal stand) and a tilt stand with the roll drive shaft tilted downward by 45 ° (henceforth, tilt stand) are arranged alternately. The present invention relates to such a 4-roll tandem rolling mill.

[0003]

[Prior Art]

 A conventional 4-roll tandem rolling mill described in Japanese Utility Model Laid-Open No. 3-31004 will be described with reference to FIGS. FIG. 5 is a front view of the tandem rolling mill as seen from the direction of the pass line, and shows the roll housing 50 of the horizontal stand, its drive shaft system, and the drive shaft system of the tilt stand.

The roll housing 50 is one in which four hole-type rolls 50 a are built in a housing having an approximately octagonal outer shape, and several side projections 53, which are cylindrical protrusions, are provided on the front and rear side walls. Has been formed. On the other hand, a pair of pedestals 52 are installed on the main body frame 51, the surfaces facing each other are formed to be inclined downward, and are formed in a substantially V shape in a front view. The pedestal 52 extends on the body frame 51 in a direction perpendicular to the plane of the drawing, and a large number (for example, 24) of roll housings 50 are placed with their side seats 53 in contact with each other. Further, each roll housing 50 is pressed from above by a vertical clamp 68 which is pressed by a clamp cylinder 67, and is fixed on the pedestal 52.

A roll drive shaft 55 for driving the hole-type roll 50 a extends laterally from the roll housing 50 of the horizontal stand shown in the drawing, and faces a detachable coupling 56. When the detachable coupling 56 is axially moved by the coupling shifter 57 and connected to the roll drive shaft 55, the hole type roll 50a is connected to the speed reducer 58 and the drive motor 59 and rotated. Although not shown on the back side of the roll housing 50 of the horizontal stand, the roll housing of the tilted stand is installed on the pedestal 52 at an angle of 45 degrees. The roll drive shaft 55 and the detachable coupling The 56 and the coupling shifter 57 are also arranged at an angle of 45 degrees and are connected to the speed reducer 58 and the drive motor 59.

By the way, when changing the outer shape of the material to be rolled, it has to be replaced with a roll housing having a hole type roll corresponding to the diameter of the material. In that case, the roll housing 50 is replaced by first retracting the detachable coupling 56 with the coupling shifter 57, separating it from the roll drive shaft 55, and then lifting the roll housing 50 upward with a crane or the like. There is.

Since the detachable coupling 56 needs a moving stroke for separating from the roll drive shaft 55, it is generally configured as shown in FIG. Reference numeral 60 is a drive shaft on the reducer side, and a gear 61 is fixed to the drive shaft. A coupling case 62 is axially slidably fitted on the outer periphery of the gear 61, and an inner gear 63 meshing with the gear 61 and a gear 54 at the tip of the roll drive shaft 55 are fitted on the inner peripheral surface of the coupling case 62. An internal gear 64 is formed to mesh with the internal gear 64. Further, an annular protrusion 65 that abuts on the coupling shifter 57 is formed. When the shifter 57 moves in the direction of arrow a, the coupling case 62 retracts by the stroke S and is separated from the roll drive shaft 55. Is becoming Then, when the shifter 57 is returned to the original position, the coupling case 62 can be advanced to the position where it is meshed with the gear 54 of the roll drive shaft 55 by the urging force of the coil spring 66.

[0008]

[Problems to be solved by the device]

 However, the conventional 4-roll tandem rolling mill has the following problems. First, there is a problem that the workability when lifting the roll housing 50 upward is poor. This is because the roll housings 50 are arranged so that the side seats 53 of the adjacent roll housings are in contact with each other as a measure against the tension between the stands of the rolling mill. by. Therefore, there is no particular problem when sequentially replacing the stands at both ends, but the lifting workability becomes a problem when replacing the intermediate stands. In addition, when the intermediate roll housing is inserted again, it is difficult to insert the roll housing due to the roll housings on both sides falling toward the opposite side.

Next, there is a drawback that the high-speed rotation performance is poor. When replacing the roll housing 50, the detachable coupling 56 must be retracted to separate from the roll drive shaft 55, but the body length of the detachable coupling 56 is increased by a length that requires the retract stroke S. Therefore, there was a limit to the high speed rotation. That is, when rotating normally at 5000 rpm or more, the vibration of the coupling case 62 increased and the life of the detachable coupling 56 was greatly shortened. In addition, when operating the rolling mill in a state where some of all stands are removed, it was necessary to install a dummy housing that supports the coupling case 62 in order to prevent whirling of the detachable coupling 56. However, doing so complicates housing replacement and limits the pass schedule for a limited number of housings.

In view of the above circumstances, an object of the present invention is to provide a 4-roll tandem rolling mill in which the roll housing can be easily replaced and high speed rotation is possible.

[0011]

[Means for Solving the Problems]

 The four-roll tandem rolling mill of the present invention is a tandem rolling mill in which horizontal stands and tilting stands each having roll housings are alternately arranged close to each other. Each stand is slidably mounted on the body frame of the stand in a direction orthogonal to the pass line, and an actuator for sliding the cradle is installed between each cradle and the body frame.

The actuator referred to in the present invention may be any actuator as long as the pedestal can be slid, and for example, a cylinder or the like is used.

[0013]

[Action]

 In the present invention, when the actuator is actuated and the roll housing is slid at a right angle in the pass line direction, a gap is formed between the adjacent housings. For this reason, the lifting work with a crane or the like can be roughly performed, and the workability is improved. Also, the actuator can easily pull in the intermediate roll housing.

Further, if the roll drive shaft can be connected / disconnected to / from the attachment / detachment coupling on the reducer side by sliding the roll housing, the stroke for extending / retracting the attachment / detachment coupling itself in the axial direction can be reduced, and the cylinder thereof The length can be short. For this reason, vibration does not easily occur in the detachable coupling even at high speed rotation, and it is not necessary to use a dummy housing when operating with some roll housing removed.

[0015]

【Example】

 Next, an embodiment of the present invention will be described. 1 shows the main part of the horizontal stand A, and FIG. 2 shows the main part of the tilt stand B. The parts not shown in FIGS. 1 and 2 have the same structure as the conventional example of FIG.

In FIG. 1, reference numeral 1 denotes a roll housing having a substantially octagonal outer shape, in which four hole-type rolls 2 are housed. These four hole-type rolls 2 are the ones in which the rotation axes of the rolls 2 are arranged in the same plane at intervals of 90 degrees so as to form one circular hole-type, so-called four-roll type holes. It is a mold roll. O is a pass line passing through the roll holes in a direction perpendicular to the paper surface, and when a shaped material such as a round bar steel passes along the pass line O, it is rolled by four hole-shaped rolls 2 and has a predetermined diameter. Shaped to size. On the front wall 1a and the rear wall 1b of the roll housing 1 (see FIG. 4), eight side seats 3, which are short circular protrusions, are formed at equal intervals on the circumference centered on the pass line O. Has been done.

On the main body frame 4, a pedestal 5 on which the roll housing 1 is placed is slidably attached by a guide groove 6. The guide groove 6 is a known groove including a dovetail groove and a dovetail groove that fits into the dovetail groove, and the dovetail groove (or the dovetail groove) may be formed on either the main body frame 4 or the pedestal 5. The slide direction regulated by the guide groove 6 is a direction orthogonal to the pass line O and parallel to the axial direction of the drive system (roll drive shaft 9 and transmission shaft 10) described later. A cylinder 7 is installed between the pedestal 5 and the body frame 4, and when the cylinder 7 is expanded and contracted, it is guided by the guide groove 6 and the roll housing 1 moves in the direction of arrow b.

A roll drive shaft 9 for transmitting a rotational force to the hole type roll 2 extends from the side of the roll housing 1, and a detachable coupling 11 attached to a transmission shaft 10 on the reducer side. Facing each other.

Details of the detachable coupling 11 are shown in FIG. A flange 12, a gear 13, and a collar 14 are fixed in this order to the tip of the transmission shaft 10, and a coupling case 15 is externally attached to the outer periphery of them. An internal gear 16 is formed on the inner circumference of the right end of the coupling case 15 in the figure, and an internal gear 17 is formed on the inner circumference of the left end of the coupling case 15. The internal gear 16 is constantly meshed with the gear 13. A spring seat 18 is formed on the outer periphery of the distal end of the coupling case 15, and a coil spring 19 is interposed between the spring seat 18 and the flange 12. A guide ring 20 is formed on the inner periphery of the center of the coupling case 15, and the inner peripheral surface of the guide ring 20 is brought into sliding contact with the outer periphery of the collar 14, and is kept in this state by the urging force of the coil spring 19 at all times. There is. By thus fitting the guide ring 20 to the collar 14, whirling of the coupling case 15 is prevented during high-speed rotation.

On the other hand, a gear 21 is fixed to the tip of the roll drive shaft 9. When the roll housing 1 slides, the gear 21 at the tip of the roll drive shaft 9 enters the coupling case 15 and meshes with the internal gear 17, so that the roll drive shaft 9 and the transmission shaft 10 are connected. When they come out of the coupling case 15 and come out of engagement with the internal gear 17, they are separated from each other. In this way, the connection between the roll drive shaft 9 and the detachable coupling 11 is performed only when the detachable coupling 11 does not move and the roll drive shaft 9 moves back and forth. Therefore, the detachable coupling 11, particularly the coupling case. The feature is that the trunk length of 15 is shortened.

Next, as shown in FIG. 2, the tilt stand B is provided with the roll housing 1 and its drive system tilted by 45 degrees. Except for this, the horizontal stand A of FIG. It is similarly configured. However, due to the slanted arrangement, the pedestal 25 is provided so as to slide on the guide groove 26 formed on the main body frame 24 at an angle of 45 degrees, and the pedestal 25 and the main body frame 24 are A cylinder 27 is attached between them. With such a configuration, the roll housing 1 slides in parallel to the roll drive shaft 9 and the transmission shaft 10 which are perpendicular to the pass line O as shown by an arrow c and inclined by 45 degrees, that is, in the direction of 45 degrees obliquely. It is supposed to do.

As shown in FIG. 4, the horizontal stand A and the inclined stand B are alternately arranged, and each roll housing 1 has its side seat 3 so as to withstand the tension between the stands of the rolling mill. Are placed in contact with each other.

Next, the work of replacing the roll housing in this embodiment will be described. In FIG. 1, the roll housing 1 shown by the solid line is the rolling position, and when pushed out by the cylinder 7 from this state, the roll housing 1 is slid to the position shown by the chain line. In this case, the sliding stroke requires that the side seats 3 adjacent to each other be disengaged from each other and the roll drive shaft 9 be completely separated from the detachable coupling 11. When the roll housing 1 slides in this way, a gap is created between the roll housings 1 adjacent to each other, so that the lifting work by a crane or the like becomes easy. The same applies to the case of the tilt stand B shown in FIG. 3. When the roll housing 1 is pushed diagonally upward by the cylinder 27, the contact with the side seat 3 of the adjacent roll housing 1 is released, and the roll drive shaft 9 is removed. It can be separated from the removable coupling 11. Therefore, if the roll housing 1 is similarly lifted by a crane or the like, the roll housing 1 can be easily taken out.

When installing a new roll housing 1, the reverse operation to the above may be carried out. For example, the roll housing 1 is hung on the pedestals 5 and 25 with a crane or the like, and the pedestals 5 and 25 are mounted on the cylinders 7 and 27. By pulling No. 25 to the stroke end, the roll housing 1 can be set at each rolling position.

In the present embodiment, in addition to the easy replacement of the roll housing 1 as described above, since the body length of the detachable coupling 11 is short as described above, vibration is less likely to occur and it is suitable for high-speed rotation. is there. Further, since whirling of the coupling case 15 of the detachable coupling 11 is prevented by the sliding contact between the guide ring 20 and the collar 14, even when not connected to the roll drive shaft 9 on the roll housing 1 side, It does not matter if the dummy housing is not supported and it is allowed to spin. Therefore, the housing can be easily replaced, and the limited housing can be effectively used for the pass schedule, which increases the flexibility of setting conditions.

As another embodiment of the present invention, although the cylinder is used as the actuator in the above embodiment, a motor is used instead of the cylinder to rotate the screw rod to advance the pedestal, and further A mechanism equipped with a stopper that stops the table at the stroke end may be used.

[0027]

[Effect of the device]

 According to the present invention, it is possible to easily replace the roll housing in the 4-roll tandem rolling mill. In addition, high-speed rotation is possible, and it is possible to flexibly respond to rolling setting conditions.

[Brief description of drawings]

FIG. 1 is a front view of a horizontal stand of a rolling mill according to an embodiment of the present invention.

FIG. 2 is a front view of a tilt stand of a rolling mill according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of the removable coupling shown in FIGS. 1 and 2.

FIG. 4 is a side view showing a state in which a horizontal stand A and an inclined stand B are arranged in tandem.

FIG. 5 is a front view showing a conventional 4-roll tandem rolling mill.

FIG. 6 is a cross-sectional view of a detachable coupling in a conventional rolling mill.

[Explanation of symbols]

1 Roll housing 7,27 Cylinder 3 Side seat 9 Roll drive shaft 4,24 Body frame 11 Detachable coupling 5,25 Cradle A Horizontal stand 6,26 Guide groove B Tilt stand

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeharu Ochi 5-2 Sokai-cho, Niihama-shi, Ehime Sumitomo Heavy Industries Machinery Co., Ltd. Niihama Plant (72) Inoue Iio 5-2 Sokai-cho, Niihama-shi, Ehime Sumitomo Heavy Industries, Ltd. Niihama Works

Claims (1)

[Claims for utility model registration] 1. A tandem rolling mill in which horizontal stands and tilt stands each having roll housings are alternately arranged in close proximity, and a pedestal on which the roll housings are mounted is provided. Each roll housing is slidably mounted on the body frame of each stand in a direction orthogonal to the pass line, and an actuator for sliding the cradle is installed between each cradle and the body frame.
Roll tandem rolling mill.