JPH0815613B2 - Rolling roll entry device and method for manufacturing steel reinforcing bar - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to the manufacture of steel reinforcing bars.

[0002]

2. Description of the Related Art Various methods for manufacturing steel reinforcing bars are known in the art. Reinforcement bars are important when manufacturing roads, bridges and other concrete structures. When manufacturing a reinforcing rod, a hot stock or rod is inserted between a pair of rollers, generally referred to as "rolls," which rotate in opposite directions. This is called rolling. Repeated rolling is necessary to give sufficient tensile strength to the finished steel reinforcing rod, and further rolling can facilitate descaling or removal of surface defects on the steel rod. Usually pairs of rolls are mounted on a shaft in a housing, this whole unit being called a stand. By passing through the stand, the steel rod is formed into a shape according to the contour shape of the roll. If the steel reinforcement bar is round, both sides of the steel rod must be rolled sequentially on the stands so that the product is symmetrical.

In a conventional rolling mill, all the stands are arranged on the same axis, and the steel rod is twisted by about 90 ° by a twist guide or a twist roller before entering the next stand. This is the twist method (tw
ist-method). When manufacturing a steel rod using this method, the twist angle is set incorrectly, or the wear of the twist roller prevents the steel rod from being properly or completely aligned to the next stand. It was a problem because it could not be done. Further, when a steel rod is manufactured using this twisting method, there is a problem in that the steel bar is likely to cause a defect on the surface due to contact with the twist guide or the twist roller.

An improved rolling mill with stands arranged sequentially along the horizontal and vertical axes eliminates many of the drawbacks of the twisting method, especially when rolling round products. This stand arrangement is commonly used in modern rolling mills and is used when producing alloy steel products with extremely strict surface finish of the final product.

When manufacturing a round steel reinforcement bar with a small diameter, a very high rolling speed must be maintained in order to improve productivity, because of its small cross section and therefore low mass per length. However, at higher rolling speeds, the problem of twist between the stand and the bar increases.
Furthermore, when rolling at such high speeds, there is a problem with the collection of finished steel reinforcement bars, usually the bar delivered from the rolling process is laid on the coil and then straightened in another process. I have to make a form. At low speeds, the finished straight rod can be fed directly to the cooling bed.

Recently, a new method for manufacturing a steel reinforcing bar has been developed, in which a steel stock is rolled into a predetermined contour shape, and in a subsequent step, it is vertically slit. Roll to the required shape and size. This is slit rolling (slit-rolli).
ng) method. The advantage of this system is that the same productivity can be maintained at half the rolling speed so that the finished bar can be delivered straight to the regular cooling bed. However, when the normal horizontal stand device or the horizontal and vertical stand devices are used for this slit rolling method, the following problems are likely to occur.

[0007]

FIG. 1 shows a typical horizontal stand-slit rolling device in which the rod twisting guide or twist roller, the base and the roller rotating device are omitted. . It is necessary to twist the steel rod between all stands, including between the last two stands 17,18. Twisting each rod delivered from the stand 17 should stop the other stand if problems occur with either stand, thus causing a product defect called a bottleneck, It is a danger.

FIG. 2 shows a typical horizontal and vertical slit rolling device, in which the rod twist guide or twist roller, the base and the roller rotating device are omitted. Most of the twist is eliminated, but it requires twisting between stands 14,15 and between stands 15-16. Furthermore, the overlap of the longitudinally cut elliptical cross sections from the stands 17 to 18 causes the steel rod to bend at the longitudinal axis of that cross section, which does not provide all the advantages of the horizontal and vertical stand arrangements.

The present invention provides an improved apparatus and method for manufacturing a steel reinforcing bar that eliminates the drawbacks of the conventional methods for manufacturing a steel reinforcing bar, which method is NTA.
Method (NTA is a non-twist approach)
proach)) is meant.

[0010]

FIGS. 3 and 4 show two embodiments of an apparatus using the NTA method, which for clarity include a conventional base and a stand housing.
The device for rotating the roller including the stand is omitted.

The first feature of both embodiments of the manufacturing apparatus is that
The sides of the rolls of the stands 13, 14 are arranged at an angle of 45 ° with respect to the vertical plane passing through AA and at an angle of approximately 90 ° to each other, so that in the stand 15 the steel stock does not have to be twisted. Is.

The second feature of the first embodiment of the manufacturing apparatus is that the side portions of the rolls of the stand 17 are vertically arranged, and the side portions of the rolls of the stand 18 are horizontal with respect to a vertical plane passing through AA. They are arranged and arranged at approximately 90 ° to each other, so that the steel rod does not have to be twisted at the end of rolling.

The second feature of the second embodiment of the manufacturing apparatus is A-
The sides of the rolls of the stands 17 ', 18' with respect to the vertical plane passing through A are in the opposite direction at about 45 ° and at about 9 ° to each other.
It is arranged at an angle of 0 °, so that it does not have to be twisted at the end of the steel rolling.

[0014]

The operation of the present invention having the above structure will be apparent from the description of the following embodiments with reference to the accompanying drawings.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the accompanying drawings, FIGS. 3 and 4 are schematic perspective views showing first and second embodiments of a manufacturing apparatus embodying the present invention. For clarity, the base of the manufacturing apparatus, the housing of the stand, and the drive for rotating the roll containing the stand have been omitted. This manufacturing apparatus can roll the steel rod without twisting it into the required shape. As shown in FIGS. 3 and 4, the stand is arranged such that its sides are oriented in various directions with respect to a vertical plane passing through AA.

In the first embodiment of the present invention shown in FIG. 3, a steel reinforcing rod can be manufactured as follows. First, the steel rod shown in FIG. 5 is rolled by the first stand 13 whose rolling surface 231 forms an ellipse, and the side portion 233 of the roll 23 of this first stand 13 is manufactured by a manufacturing device, namely
Arranged in the predetermined direction of the twist type slit rolling device
Approximately 4 in the first direction with respect to the vertical plane AA which is the reference plane.
It is oriented 5 ° offset. This first stand 13 is shown in detail in FIG. The rod rolled by the first stand 13 has an elliptical cross section as shown in FIG. 7, and then the second stand 1 shown in detail in FIG.
It is rolled at 4. The second stand 14 has a rolling surface 241 forming a square shape and orients the side portions 243 of the roll 24 in a direction offset from the vertical surface AA in the second direction by approximately 45 °. The elliptical steel rod is twisted in order to enter the second stand 14 because the major axis of the elliptical cross section in the rolled state is already oriented in the diagonal direction of the rectangular rolling surface of the second stand 14. No need.

The steel rod rolled into a shape with a generally rectangular cross-section as shown in FIG. 9 is then rolled on a stand 15 having a rolling surface 251 in the shape of a slight overlap of two circles. The side portion 253 of the is oriented in a direction substantially 0 ° offset from the vertical plane AA as shown in FIG. The steel rod coming out of the stand 15 has a cross section in which two circles are slightly overlapped, as shown in FIG. Following this, the steel rod is rolled in a stand 16 which is oriented in the same direction as the previous stand and whose rolling surface forms two abutting circles as best shown in FIG. By rolling with the stand 16,
This rod is cut into two approximately circular rods, one of which is shown in FIG. Therefore this stand
16 is a rod segment by cutting the steel rod in the longitudinal direction.
Forming a slitter device for dividing into a ment.

Next, the two rods are respectively in the stand 1
Each is rolled in 7-18 separate lines or rows of stands. The first stand 1 in each stand row
7 shows the side portion 273 of the roll 27 from the vertical plane AA to approximately 9
Offset by 0 °, the rolling surface 271 forms a substantially circle as shown in FIG. By the stand 17, the steel rod is rolled into a shape having a substantially circular cross section as shown in FIG. Next, each of the two steel rods is rolled on a stand 18 which forms a substantially circular rolling surface 281 as shown in FIG. 16 and sides 283 of the roll 28 are offset approximately 0 ° from the vertical. Due to the orientation or offset of the orientation of the two stands, the steel rod is rolled uniformly over its entire circumference without twisting. The final product is formed as two steel rods and has a circular cross section, one of which is shown in FIG.

As shown in FIG. 4, the second embodiment is the same as the first embodiment except for the orientation of the stands in a row of stands arranged laterally on the terminal end side of the device where the rolling of the steel rod ends. Since the first step is the same as the above description with reference to FIG. 3 -13 omitted.

In this second embodiment, the two rods are rolled after the stands 16 in two separate rows of stands, the first stand 17 'in each of these rows of stands being shown in FIG.
The side 27 of the roll 27 'is best shown in FIG.
3'is offset from the vertical plane AA in one direction by approximately 45 ° and the rolling surface 271 'forms an ellipse. Stand 1
The steel rod emerging from 7'has an elliptical cross section as shown in FIG. The steel rod is then rolled on stand 18 '. The stand 18 'has a circular cross section and the sides 283' of the roll 28 'are offset from the vertical plane A-A by approximately 45 ° in a second direction opposite the first direction. Two
The two stands are offset 45 ° from the vertical and 90 ° to each other so that the steel rod is rolled evenly around its entire circumference without twisting. The final product has a circular cross section 2
Formed as a book steel rod, one of which is shown in FIG.
It is shown in.

Next, the two embodiments will be described in detail. The stand and its product are as follows.

5 to 13 are common to both embodiments of the manufacturing apparatus and show the orientation of the stands through the plane A--A and the cross section of the steel rod after rolling on each stand.

FIG. 5 is a sectional view of the steel rod before it is rolled by the stand 13.

FIG. 6 shows details of the stand 13 along the plane AA, the housing not shown. This stand 1
3 comprises two adjacent rolls 23, having a rolling shape or contour recessed in a semi-elliptical shape, each roller rotating in opposite directions along its parallel axis 232.
The sides of 33 are offset approximately 45 ° to one side from the plane passing through AA.

FIG. 7 shows a cross section of an oval steel rod after it has been rolled on stand 13, the major axis of which is offset by approximately 45 ° from the plane passing through A--A.

FIG. 8 shows the stand 14 excluding the housing and is a view along the plane AA. The stand 14 comprises two adjacent rolls 24 and has a triangular rolling shape or contour, each roller rotating in opposite directions along their parallel shafts 242 and the sides of the roll 243 of the stand 13. Like the roll, it is offset by 45 ° in the opposite direction from the plane passing through AA. Stand 13, 1
The sides of the four rolls 23, 24 are therefore approximately 9 to each other.
Offset by 0 °.

FIG. 9 is a view of the rectangular steel rod after being rolled by the stand 14, as viewed along the line AA.

FIG. 10 is a view of the stand 15 along the line AA except for the housing. The stand 15 comprises two adjacent rolls 25 having two slightly overlapping semi-circular rolling shapes 251, each roll having its parallel shaft 2
Rotating in the opposite direction along 52, the sides of roll 253 are arranged parallel to the plane through AA.

FIG. 11 is a sectional view of the steel rod coming out of the stand 15 and passing through the plane AA.

FIG. 12 is a view along the plane AA excluding the housing of the stand 16. The stand 16 has a rolling surface 261.
Comprises two adjacent rolls 26 having two adjacent semi-circular shapes, each roller rotating in opposite directions along its parallel axis, its sides 263 being arranged parallel to AA.
The stand 16 cuts the entered steel rod shown in FIG. 11 into two steel rods.

FIG. 13 is a sectional view showing the steel rod in a state of coming out of the stand 16 along the plane AA.

14 to 17 are different from the first embodiment.

FIG. 14 shows a stand 17 excluding the housing.
Is shown along the plane A-A. The stand 17 comprises two adjacent rolls 27 having semi-circularly recessed rolling contours 271 each of which rolls rotate in opposite directions along their parallel axes 272, the sides 273 of which are A- It is arranged offset from the plane passing through A by almost 0 °.

FIG. 15 is a sectional view of the steel rod fed from the stand 17.

FIG. 16 shows an A-A structure with the housing removed.
It is a view of the stand 18 passing through the surface. The stand 18 comprises two adjacent rolls 28 having a semi-circular recessed rolling shape, each roll rotating in opposite directions along a parallel axis 282, the side portions 283 of the rolls being similar to the stand 17. It is offset by approximately 90 ° from the plane passing through -A.

FIG. 17 is a sectional view of the completed reinforcing rod as delivered from the stand 18.

The second embodiment of this device is substantially similar to the first embodiment, but the orientation of the stands 17 ', 18' is different, and these features are described in FIGS. 18-21.

FIG. 18 shows the surface A with the housing removed.
It is a figure of the stand 17 'which passes through -A. Stand 17 '
Is equipped with two adjacent rolls 27 ', the rolling shape 2
71 'has a semi-circular recessed shape, and each roll rotates in the opposite direction along the parallel axis 272', so that the side 2
73 'is offset to the one side by about 45 ° from the plane passing through AA.

FIG. 19 is a sectional view of the steel rod fed from the stand 17 '.

FIG. 20 shows the surface A with the housing removed.
FIG. 7 is a view of the stand 18 ′ passing through A. Stand 18 '
Comprises two adjacent rolls 28 'having a rolling profile 281 in the shape of a semi-circular recess, each roll rotating in opposite directions along a parallel shaft 282',
Reference numeral 83 ', like the stand 17', is offset by about 45 ° in the opposite direction from the plane passing through AA.

FIG. 21 is a sectional view of the completed reinforcing rod as delivered from the stand 18 '.

The figures are not shown on an actual scale, but the features of the present invention are clarified.

The accompanying drawings and the above description do not represent only one form of detail as to their construction and method of operation. Indeed, it will be apparent to one skilled in the art that variations and modifications can be made without departing from the spirit and scope of the invention. The relationship between the shape and the members can be suitably changed depending on the situation, and can be replaced with an equivalent one. It should be noted that the terms used in this specification are for general and explanatory purposes, and it is obvious that the present invention is not limited thereto.

[0044]

As is apparent from the above, according to the present invention,
Provided is an improved apparatus and method for manufacturing a steel reinforcing bar that eliminates the drawbacks of the conventional methods for manufacturing a steel reinforcing bar.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional slit rolling device using a horizontal stand.

FIG. 2 is an explanatory diagram of a conventional slit rolling device using vertical and horizontal stands.

FIG. 3 is an explanatory diagram excluding a base, which is a member of a normal structure of an apparatus according to an embodiment of the present invention, a housing of a stand, and an apparatus for rotating a roll.

FIG. 4 is a view similar to FIG. 3 of another embodiment of the present invention.
These two embodiments show stands 17, 17 'and 1
It is the same except for the directions of 8 and 18 '.

FIG. 5 is a cross-sectional view taken along the plane passing through AA of the steel rod before entering the stand 13, and FIGS.
FIG. 5 is an explanatory view showing a steel rod and a stand in various steps common to rolling of both examples shown in FIGS. 3 and 4.

FIG. 6 is an explanatory view of the stand 13 taken along the plane AA.

7 is a cross-sectional view taken along the plane AA in a state of being aligned for entering the stand 14 after being rolled by the stand 13. FIG.

FIG. 8 is a view taken along the plane AA of the stand 14.

FIG. 9 is a cross-sectional view taken along the plane AA after being rolled by the stand 14.

FIG. 10 is a view taken along the plane AA of the stand 15.

FIG. 11: Stand 16 after being rolled by stand 15
FIG. 4 is a cross-sectional view along the plane AA of the steel rod aligned for entering the

FIG. 12 is a view taken along the plane AA of the stand 16.

FIG. 13: After rolling and cutting on stand 16,
It is sectional drawing which follows the AA surface of one of the steel rods before entering the stand 17.

14 is a view taken along the plane AA of the stand 17, and FIGS. 14 to 17 show the steel rod and the stand at various stages of the rolling process in the first embodiment of FIG.

FIG. 15: Stand 18 after being rolled by stand 17
A of the steel rod aligned to enter the
It is sectional drawing which follows the -A surface.

16 is a view taken along the plane AA of the stand 18. FIG.

FIG. 17 is a sectional view taken along the plane AA of the completed steel reinforcing bar.

FIG. 18 is a view taken along the plane AA of the stand 17 ′,
18 to 21 show sections and stands of the steel rod at various stages of the second embodiment shown in FIG.

FIG. 19: Stand 1 after being rolled by stand 17 ′
8A is a cross-sectional view taken along plane AA of the steel rod in the aligned state for entering 8 '. FIG.

FIG. 20 is a view taken along the plane AA of the stand 18 ′.

FIG. 21 is a sectional view taken along the plane AA of the completed steel reinforcing bar.

[Explanation of symbols]

13, 14, 15, 16, 17, 18, 18 '... Stand, 23, 24, 25, 26, 27, 27', 28, 2
8 '... roll, 231, 241, 251, 261, 27
1,271 ', 281,281' ... Rolled surface, 233, 2
43,253,263,273,273 ', 283,2
83 '... Side.

Claims (10)

[Claims] 1. A steel rod-to-steel structure having stands through which a steel rod to be rolled passes, each stand having rolls whose contours are in close proximity to one another and a shaft which laterally supports these rolls. a non-twisting type slit rolling apparatus for producing the manufactured reinforced bar, this
Of the slit rolling device in the predetermined direction
The side of the roll in the first direction from this reference plane
The first stand, which is arranged with an offset of about 45 ° ,
Separated from this first stand, the side of the roll
And a second stand arranged in a second direction opposite the first direction and offset by approximately 45 ° from the reference plane , the sides of the rolls of the two stands being approximately 90 ° relative to each other. Offset and both stands are on the upstream side of the steel rod in this slit rolling device .
Is disposed on one end side, and further, the can side first is arranged downstream of the second stand is disposed at an angle of approximately 45 ° to the roll side of the second stand, and the first A slitter device including opposed rolls for receiving a steel rod from two stands without twisting the middle part and cutting the steel rod in the longitudinal direction to divide it into rod segments; is disposed along a downstream side of the lateral offset to the line of the slitter apparatus in end-to-side, and a plurality of stands for rolling receiving said divided rod segments are, each rod segments divided by the slitter device But on the downstream side
Slit rolling device that is transferred to a stand arranged in the same place without being twisted . 2. Each line offset in the horizontal direction
One of the plurality of stands along the side of the roll is arranged with the side of the roll offset by approximately 45 ° in the first direction with respect to the reference plane.
And the other stand is spaced apart from the one stand by a predetermined distance and offsets the side portion of the roll by about 45 ° in a second direction opposite the first direction with respect to the reference plane .
The slit rolling device according to claim 1, wherein the slit rolling device is offset by approximately 90 ° with respect to a side portion of a roll of the one stand . 3. Each line offset in the lateral direction
One of the plurality of stands along the side of the roll is arranged at approximately 0 ° with respect to the reference plane, and the other stand is provided with the above-mentioned one.
One of the predetermined distance apart to be disposed from the stand, the roll
Offset the sides by approximately 90 ° with respect to the reference plane ,
, 90 to the side of the roll of the one stand
The slit rolling device according to claim 1, wherein the slit rolling device is offset. 4. The slit rolling apparatus according to claim 1, further comprising a delivery device for delivering the rod segment directly from the other stand to the cooling bed in a substantially straight line state. 5. The slit rolling device according to claim 1, wherein the reference plane is arranged vertically. 6. The rolls of the other stands in each line are oriented at 90 ° to each other with the rolls of the adjacent stands such that the rod segments can pass from the slitter device to the other stands without twisting the middle portion. 2. The method according to claim 1, wherein the rod is moved so that it does not undergo twisting of the intermediate section from the supply to the first stand until it is discharged as a rod segment from the end of the other stands of each offset line. Slit rolling device. 7. The roll of the first stand has a shape of rolling an elliptical cross section of a rod, and the elliptical cross section has a main axis inclined at an angle of 45 ° with respect to the reference plane, The roll of the second stand has a shape of rolling the rod sections into a substantially rectangular cross section having sides parallel to each other and perpendicular to the reference plane, and the slitter device rolls the rod rolled into a rectangular section. The slit rolling device according to claim 1, wherein the slit rolling device has a shape in which one side portion thereof is vertically cut open. 8. A non-torsion type slit rolling method for manufacturing a steel reinforcing bar from a steel rod, comprising: a. Rolling a steel rod with a first stand having rolls whose sides are offset approximately 45 ° in a first direction relative to a reference plane extending in a predetermined direction , b. Rolling the steel rod with a second stand having rolls whose sides are offset approximately 45 ° from the reference plane in a second direction opposite the first direction, c. The side portion is 4 relative to the side portions of the rolls of the first and second stands without twisting the middle portion from the second stand.
Feeding a steel rod to a slitter device with rolls inclined at an angle of 5 °, d. Rolling and splitting a steel rod into a number of steel rods with said slitter device , e. Transporting the rod segment from the slitter device along each laterally offset line of the roll of the stand that is further continuous without twisting the middle section; f. A method of rolling each of said steel rod segments in each laterally offset line through said successive stands with rolls offset from each other by an angle of approximately 90 °. 9. The method according to claim 8, wherein the reference plane is arranged vertically. 10. Place the roll side of the successive stand in line to the offset approximately 45 ° with respect to the reference plane, or one roll of continuous stand in line to the offset claim placed approximately 90 ° to the side relative to the reference plane, and that substantially parallel to the front <br/> Symbol reference surface roll side of the adjacent stands in each line to the offset 8. The method according to 8.