JP3059365B2 - 2-roll straightener runout prevention U guide - Google Patents

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 small-diameter-sized steel bars manufactured by hot rolling or the like.

[0002]

2. Description of the Related Art Steel bars produced by hot rolling or the like are straightened between rolls. For example, straightening is performed between two rolls arranged on an oblique axis with respect to the passage of the steel bar to be processed. By the way, in such a roll straightening machine, a guide having a U-shaped cross section, that is, a U guide is disposed in front of the roll to suppress the bar from swaying right and left immediately before entering the roll. However, when the steel bar has a small diameter of 18 to 30 mm, the U-guide alone may not be able to sufficiently suppress the runout of the steel bar. In some cases, the quality was reduced and production was hindered.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a steel bar, particularly φ
The purpose of the present invention is to precisely prevent the deflection 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]

According to a first aspect of the present invention, there is provided a U-guide disposed in front of the entrance side of a two-roll straightening machine for steel bars. Locking rod insertion holes are formed above both side walls in the front part in the forward direction of the material to be processed, and the lower part is bifurcated and includes a holding plate through which the material to be processed is passed. An attachment made of ductile cast iron having a stop rod insertion hole is provided in a size that can be installed in the U guide inner wall, and the attachment is installed in the U guide inner wall, and the U guide and the engagement rod insertion hole of the attachment are provided. A two-roll straightener runout prevention U-guide, wherein a locking bar is inserted and fixed.

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

According to a third aspect of the present invention, there are provided the U-guide and the attachment according to the first or second aspect, wherein two locking rod insertion holes for the attachment are provided in parallel in the advancing direction of the workpiece. 2 is a U-guide for preventing run-out of a two-roll straightener.

[0007]

The operation of the present invention will be described. In a two-roll straightening machine for straightening rolled steel bars and the like,
A U guide is provided to prevent the workpiece from swinging before the entry side of the roll straightening machine.
In the case of a small diameter of 8 to 30, it is difficult to prevent the deflection. However, in the present invention, the attachment is further fixed in the inner wall of the U guide, and the attachment has a holding plate that is opened in a forked lower part, and a steel bar to be processed is passed through the holding plate of the forked. Because of the structure, even if the material to be processed is a small-diameter steel bar having a diameter of 18 to 30, the passage in the U guide is regulated, and the run-out of the material to be processed is prevented. In the attachment of the present invention, a locking rod insertion hole is formed in each of the upper side walls of the U guide and the upper vertical plate following the holding plate of the attachment, and the locking rod is inserted into the locking rod insertion hole. Since it is fixed, attachment and detachment of the attachment to and from the U guide can be easily performed.
In the case of a small diameter of 8 to 30, the attachment can be easily installed on the U guide, and in the case of a workpiece having a larger diameter, the attachment can be easily removed, and the U guide itself does not need to be changed.
Since the wedge is inserted into the wedge hole of the locking rod, the attachment is securely fixed without moving in the U guide due to vibration during operation or the like. Further, since two locking rod insertion holes for the U guide and the attachment are provided in parallel in the processing material advancing direction, the attachment is securely fixed in the U guide in the processing material advancing direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 before the entrance side thereof, and an attachment and a workpiece according to the present invention mounted in the U guide. In the figure, reference numeral 1 denotes a material to be processed, and an upper roll shaft 4 and a lower roll shaft 5 are provided at different angles in the axis of the material 1 to be processed, that is, in the traveling direction 15 of the material 1. 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 advancing direction 15 of the material to be processed is provided in front of the straightening rolls. Two locking rod insertion holes 9 are formed in the processing material advancing direction 15 above both side walls of the U guide 6 in front of the processing material advancing direction 15. Inside the U guide 6, an attachment 7 made of ductile cast iron is attached. The shape of the attachment 7 has a length of 300 to 400 mm and a height of about 300 m in the processing material advancing direction 15.
m, the lower part opens into a fork comprising a holding plate 8, and the thickness of the holding plate 8 of the fork part is 40 to 50 mm, and the thickness of the upper vertical plate following the fork is 60 to 70 mm, and the upper part following the fork Each of the vertical plates is provided with two locking rod insertion holes 10, 10 in the processing material advancing direction 15, respectively. A locking rod 11 is inserted through a locking rod insertion hole 9 of the U guide 6 and a locking rod insertion hole 10 of the attachment 7, and a wedge 13 is inserted into a wedge hole 12 formed near both ends of each locking rod 11. The attachment 7 is fixed to the U guide 6 by driving. The to-be-processed material 1 is passed through a forked part of the attachment 7 formed by the holding plate 8. In FIG. 1, reference numeral 14 denotes a run-out of the workpiece 1 when the attachment 7 is not provided on the U guide 6.

FIG. 2 shows another embodiment of the attachment 7. In this attachment 7, the holding plate 8 is bifurcated evenly in the left and right directions. FIG. 3 shows still another embodiment of the attachment 7. This attachment 7
Is one in which one of the holding plates 8 is vertical and the other holding plate 8 is horizontal. Selection of the form of these attachments 7 can be appropriately selected depending on the shape of the opening having a U-shaped cross section of the U guide.

[0010]

As described above, according to the present invention, by attaching an attachment having a bifurcated holding plate in a U guide installed on the entry side of a two-roll straightening machine, a straightening operation of a small-diameter steel bar can be performed. It is easy to prevent the steel bar of the material to be processed from swaying in the U guide. In addition, since the attachment can be freely and easily attached to and detached from the U guide, it can be used at any time according to the diameter of the material to be processed. Moreover, the present invention has an excellent effect that the conventional U guide can be used as it is because the locking rod insertion hole is merely formed in the conventional U guide.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a roll portion of a two-roll straightening machine, a U guide installed before the entry side thereof, and an attachment and a workpiece according to the present invention mounted in the U guide.

FIG. 2 is a view 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]

 DESCRIPTION OF SYMBOLS 1 Processing material 2 Upper straightening roll 3 Lower straightening roll 4 Upper roll axis 5 Lower roll axis 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 Processing direction

Claims (3)

(57) [Claims] In a U-guide disposed in front of a two-roll straightening machine for a steel bar, locking rod insertion holes are formed in upper portions of both side walls of a front portion of the U guide in a moving direction of a material to be processed. Is a holding plate through which the material to be processed is opened in the fork, and a ductile cast iron attachment in which a locking rod insertion hole is formed in the upper vertical plate following the holding plate and which can be installed in the inner wall of the U guide. Wherein the attachment is installed in the inner wall of the U guide, and the locking rod is inserted into and fixed to the locking rod insertion hole of the U guide and the attachment. 2. The U-guide according to claim 1, wherein wedges are inserted into wedge holes provided near both ends of the locking rod. 3. A two-roll straightening machine runout according to claim 1, wherein two U-guides and two locking rod insertion holes for the attachment are provided in parallel in the direction of movement of the material to be processed. Prevention U guide.