JPH0952121A - U-guide for preventing oscillation of two-roll straightener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality in straightening and to enhance productivity by exactly preventing the oscillation of a bar steel, especially, a small steel with a small diameter of 16-30ϕwhich is an object to be worked in the U-guide of a two-roll straightener. SOLUTION: In the U-guide arranged on this side of the entrance of a two- roll straightener for bar steel, an insert hole 9 for an engaging bar is pierced on the upper part of both walls in this part in the advancing direction 15 of the processing material for the U-guide 6; an attachment 7 made of ductile iron in the size installable in the inner wall of the U-guide 6 is provided, the attachment 7 being composed of a holding plate 8 which has a forked end in the lower part and the processing material 1 is passed through the forked part and which has an insert hole 10 for the engaging bar drilled in the upper vertical plate following to the holding plate 8. The U-guide for preventing oscillation in the two-roll straightener is installed into the inner wall of the U-guide 6, by fixedly inserting an engaging bar 11 into its insert holes 9, 10 of the U-guide 6 and the attachment 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a U-guide for a two-roll straightening machine for straightening a small diameter steel bar manufactured by hot rolling or the like.

[0002]

2. Description of the Related Art A steel bar manufactured by hot rolling or the like is straightened by passing it between rolls. For example, it is straightened by passing between two rolls arranged on an oblique axis with respect to a passage of a steel bar as a material to be treated. By the way, in such a roll straightening machine, a guide having a U-shaped cross section, that is, a U guide is arranged in front of the roll to prevent the steel bar from swinging right and left immediately before entering the roll. However, when the steel bar has a small diameter size of φ18 to 30, it may still not be possible to sufficiently suppress the deflection of the steel bar only with this U guide, and therefore, there is a case where satisfactory straightening cannot be performed, and This could lead to quality deterioration and hinder production.

[0003]

DISCLOSURE OF THE INVENTION The present invention is a steel bar, particularly φ, which is a workpiece in a U-guide of a two-roll straightening machine.
The purpose is to accurately prevent runout of a steel bar having a small diameter of 18 to 30, improve the quality of straightening, and contribute to the improvement of productivity.

[0004]

Means for Solving the Problems The means of the present invention for solving the above-mentioned problems is, in the invention of claim 1, a U-guide arranged in front of the entrance side of a steel bar two-roll straightening machine. A locking rod insertion hole is formed above both side walls of the front part in the traveling direction of the material to be processed, and the lower vertical part opens into a fork to allow the material to be processed to pass through inside the fork. An attachment made of ductile cast iron with a stop rod insertion hole is provided in a size that can be installed in the inner wall of the U guide, and the attachment is installed in the inner wall of the U guide to be used as a locking rod insertion hole for the U guide and the attachment. A two-roll straightening machine shake prevention U guide characterized by inserting and fixing a locking rod.

According to a second aspect of the present invention, there is provided the two-roll straightening machine runout preventing U guide according to the first aspect, wherein the wedge is inserted into the wedge holes provided near both ends of the locking rod.

The invention of claim 3 is characterized in that two U guide and engagement rod insertion holes for the attachment are provided in parallel in the direction in which the material to be processed advances. 2 is a U-guide for preventing run-out of a two-roll straightening machine.

[0007]

The function of the present invention will be described. 2 roll straightening machine for straightening rolled steel bars
A U-guide is provided in front of the entrance side of the roll straightener to prevent the workpiece from swinging, but the workpiece is φ1
When the diameter is 8 to 30, it is difficult to prevent the shake. However, according to the present invention, the attachment is further fixed in the inner wall of the U guide, and the attachment has a holding plate whose lower part is opened into two forks, and the steel bar to be processed is passed through the inside of the forking press plate. Since the structure is adopted, even if the material to be processed is a steel bar having a small diameter of φ18 to 30, the passage in the U guide is restricted, and the vibration of the material to be processed is prevented. In the attachment according to the present invention, locking rod insertion holes are formed in upper portions of both side walls of the U guide and upper vertical plates following the holding plate of the attachment, and the locking rods are inserted in the locking rod insertion holes. Since it is fixed, the attachment to the U guide can be easily attached and detached.
If the diameter is 8 to 30, the attachment can be easily installed on the U guide, and if the material to be treated has a diameter larger than this, it can be easily removed and the U guide itself does not need to be changed.
Since the wedge is inserted into the wedge hole in the locking rod, the attachment is securely fixed without moving in the U guide due to vibration during operation. Furthermore, since two U-guide and attachment locking rod insertion holes are provided in parallel in the direction of travel of the material to be processed, the attachment is securely fixed in the U guide in the direction of travel of the material to be processed.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described with reference to FIGS. FIG. 1 schematically shows a roll portion of a two-roll straightening machine, a U guide installed in front of the entrance side thereof, and an attachment and a material to be treated according to the present invention mounted in the U guide. In FIG. 1, reference numeral 1 denotes a material to be treated, which is provided with an upper roll shaft 4 and a lower roll shaft 5 which are arranged in the axis of the material 1 to be treated, that is, in the traveling direction 15 of the material 1 to be treated, in oblique directions at different angles. The upper straightening roll 2 on the upper roll shaft 4
However, the lower straightening roll 3 is attached to the lower roll shaft 5. A U guide 6 extending in the longitudinal direction of the U-shaped cross section in the traveling direction 15 of the material to be processed is installed in front of the entrance side of these straightening rolls. Two locking rod insertion holes 9 are formed in the U-guide 6 above the both side walls of the front portion of the U-guide 6 in the advancing direction 15 of the processed material in the advancing direction 15 of the processed material. In the U guide 6, an attachment 7 made of ductile cast iron is attached. The shape of the attachment 7 is 300 to 400 mm in the traveling direction 15 of the material to be processed, and the height is about 300 m.
m, the lower part opens into a bifurcation consisting of a holding plate 8, the thickness of the holding plate 8 at the forked part is 40 to 50 mm, and the thickness of the upper vertical plate following the forked part is 60 to 70 mm, the upper part following the forked part The vertical plate is provided with two engaging rod insertion holes 10 and 10 in the material advancing direction 15 respectively. The locking rods 11 are inserted into the locking rod insertion holes 9 of the U guide 6 and the locking rod insertion holes 10 of the attachment 7, and the wedges 13 are inserted into the wedge holes 12 formed near both ends of each locking rod 11. The attachment 7 is fixed to the U guide 6 by driving. The material 1 to be processed is passed through the inside of the fork formed by the holding plate 8 of the attachment 7. In FIG. 1, reference numeral 14 denotes the deflection of the material 1 to be processed when the attachment 7 is not provided on the U guide 6.

FIG. 2 shows another embodiment of the attachment 7. This attachment 7 has a holding plate 8 which is bifurcated evenly on the left and right. FIG. 3 shows still another embodiment of the attachment 7. This attachment 7
One of the holding plates 8 is vertical and the other holding plate 8 is horizontal. The shape of these attachments 7 can be appropriately selected depending on the shape of the U-shaped opening of the U guide.

[0010]

As described above, according to the present invention, by attaching the attachment having the bifurcated holding plate in the U guide installed on the entrance side of the two-roll straightening machine, in the straightening operation of the small diameter steel bar, It is possible to easily prevent the steel bar to be processed from swinging in the U guide. Moreover, since the attachment can be attached to and removed from the U guide freely and easily, it can be used in a timely manner according to the size of the diameter of the material to be treated. Moreover, since the locking rod insertion hole is simply bored in the conventional U guide, the conventional U guide can be used as it is, which has an excellent effect.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a roll portion of a two-roll straightening machine, a U guide installed in front of the entrance side thereof, and an attachment and a material to be treated according to the present invention mounted in the U guide.

FIG. 2 is a diagram showing another embodiment of the attachment according to the present invention.

FIG. 3 is a view showing still another embodiment of the attachment according to the present invention.

[Explanation of symbols]

 1 Material to be treated 2 Upper straightening roll 3 Lower straightening roll 4 Upper roll shaft 5 Lower roll shaft 6 U guide 7 Attachment 8 Holding plate 9 Locking rod insertion hole 10 Locking rod insertion hole 11 Locking rod 12 Wedge 13 Wedge hole 14 Runout 15 Direction of material to be processed

Claims (3)

[Claims] 1. A U-guide arranged in front of the entrance side of a steel bar two-roll straightening machine, in which a locking rod insertion hole is formed in the upper part of both side walls of the front part of the U-guide in the traveling direction of the workpiece, Is a size that allows a ductile cast iron attachment to be installed in the inner wall of the U guide, which has a holding plate that opens into a fork and passes the material to be processed into the fork A two-roll straightening machine anti-vibration U guide, characterized in that the attachment is installed in the inner wall of the U guide, and the locking rod is inserted and fixed in the locking rod insertion holes of the U guide and the attachment. 2. A two-roll straightening machine runout prevention U guide according to claim 1, wherein a wedge is inserted into a wedge hole provided near both ends of the locking rod. 3. The two-roll straightening machine runout according to claim 1 or 2, wherein two U guide and engagement rod insertion holes for the attachment are provided in parallel in the direction in which the material to be processed advances. Prevention U guide.