JP3149779B2 - Continuous rolling method and apparatus for hot steel bars - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-rolled steel bar rolling technique, and more particularly to joining of a hot-rolled bar and continuous rolling before and after the joining.

[0002] The present invention can be applied not only to metal materials but also to non-metal material production lines.

[0003]

2. Description of the Related Art There is an extremely strong demand for continuous improvement of productivity, improvement of yield, reduction of mis-rolls and automation of work by continuous intermediate / finish rolling in a hot metal bar rolling equipment.

[0004] The key technology is how to complete hot joining in a short time.

If the joining is not completed in a short time, for example, when the joining machine is of a traveling type, the traveling distance of the joining machine becomes long and it is difficult to realize.

If the joining machine is of a fixed type, the bar material is as thick as about 50 to 70 square, so a huge looper for accumulating the bar material is required.

Conventionally, as a method of joining bars, a flash butt method, an induction heating method, a gas heating method, a fusing method, and a friction method have been proposed.

However, many methods such as the flash butt method, the induction heating method, the gas heating method or the fusing method and the friction method have not yet been realized.

The most difficult point is that joining takes too much time.

Usually, it takes at least 10 to 20 seconds to join steel bars, including preparation before joining, sagging by pressing, removal of burrs, and the like.

A conventional hot bar material joining apparatus is described in, for example, JP-A-53-5060, JP-A-53-14150, and JP-A-52-20947.

Japanese Patent Application Laid-Open No. 5-303 describes a joining technique by friction between a preceding material and a following material. Japanese Patent Application Laid-Open No. 4-158905 discloses that a joint is induction-heated at a high frequency. The joining technique for joining by joining is described.
Japanese Patent Application No. 176482 describes a technique in which a preceding material and a following material are overlapped and shear-joined.

[0013]

However, Japanese Patent Application Laid-Open No. 5-303
In the technology described in Japanese Patent Laid-Open Publication No. H07-187, it takes time to raise the temperature to the melting point because of frictional joining, and since burrs are generated at the time of upsetting, deburring time is required, and a large welding time .

In the high-frequency induction heating method disclosed in Japanese Patent Application Laid-Open No. 4-158905, although a relatively short time is required, the occurrence of burrs at the time of upsetting is unavoidable due to fusion bonding, and a deburring operation is required.
Requires a lot of deburring time. In this technique, if the deburring is omitted, there is a problem that the rolling roll is damaged.

Japanese Patent Application Laid-Open No. 61-176482 discloses lap shear bonding. However, since the active surface immediately after shearing the shape of the shear cut is once exposed to the atmosphere, generation of new oxide scale cannot be avoided. It is difficult to have sufficient bonding strength to withstand the process rolling.

The present invention improves upon the above-mentioned conventional disadvantages,
The jointing of hot-rolled bars that suppresses the generation of burrs due to joining, joins hot-rolled bars in a short time, and suppresses the generation of oxide scale to enable rolling of hot-rolled bars with excellent joint strength It is an object of the present invention to provide a joint device, a continuous rolling method, and a continuous rolling facility.

[0017]

Means for Solving the Problems A series of hot steel bars of the present invention is provided.
The continuous rolling method is based on the preceding hot steel bar and the subsequent hot steel bar.
In the continuous rolling method of hot-rolled steel, which is joined and rolled,
And the rear end of the preceding hot steel bar and the
Work into the desired shape to fit the tip of the steel bar.
And the rear end of the preceding hot steel bar and the following
A step of slidingly fitting the tip portion of the hot-rolled steel material and
The rear end of the preceding hot steel bar and the following hot steel bar
Joining process by applying shear force to the fitting part with the tip
And the rear end of the preceding hot steel bar joined and
And continuously rolling the tip of the hot-rolled steel bar
Having a sliding speed of 100 mm / s or less in the fitting step.
And the shear rate in the joining step is 100 mm / s
It is characterized by the above.

The running bar joining apparatus for hot steel bars according to the present invention is
To join the hot-rolled steel bar to the hot-rolled steel bar
In the running joining apparatus for a steel bar, the preceding hot steel bar
The rear end of the material is fitted with the front end of the following hot steel bar.
Preforming means for processing into a desired shape such as
The rear end of the hot-rolled steel bar and the tip of the subsequent hot-rolled steel bar
A sliding fitting means for slidingly fitting the end with the end;
The rear end of the hot-rolled steel bar and the tip of the subsequent hot-rolled steel bar
Shear joining by applying shear force to the fitting part with the end
Means, and the sliding speed of said sliding fitting means is 1
Means for adjusting to not less than 00 mm / s and said shear joining means
Means for adjusting the shear rate to 100 mm / s or more
It is characterized by that.

The continuous hot-rolled steel bar rolling equipment of the present invention
To join a hot steel bar to be run
In continuous rolling equipment for hot steel bars with hot-joining equipment
The rear end of the preceding hot steel bar and the subsequent hot bar.
A rough rolling mill for continuously rough rolling the tip of a steel bar;
The rear end of the hot-rolled steel bar and the tip of the subsequent hot-rolled steel bar
A pre-forming part for processing into a desired shape to fit the end
Machine and the rear end of the preceding hot steel bar and the following
An intermediate rolling mill that continuously intermediate-rolls the tip of a hot-rolled steel material
And the rear end of the preceding hot steel bar and the subsequent hot
And a finishing mill that continuously rolls the tip of steel bars.
Arranging, and the running joining apparatus is configured to
Sliding the rear end and the front end of the following hot steel bar
Means for fitting, a rear end of the preceding hot steel bar and
Shear force is applied to the fitting part of the
Means for joining the workpiece while the running joining apparatus
Between the rough rolling mill and the intermediate rolling mill or the intermediate rolling mill
And the finishing mill.
Sign.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has been made with a focus on the fact that bonding is possible in principle without melting the base material as long as the three elements of cleanliness, temperature and force are prepared. And is applicable to most steel types or non-ferrous metals.

The present invention eliminates the disadvantages of the conventional method of joining metals by melting or semi-melting, and achieves solid joining and shortening of time in a solid state.

The details are as follows.

1) First, one end and the other end of the billet material to be joined, which is a hot material, are preformed into a specific shape.

The shape is a fitting type suitable for stabilizing the joining.

By adopting the fitting shape, the area of the joining surface can be increased, and the initial scale can be reduced during the joining operation.

2) Next, in the joining operation, the primary scale is dropped by utilizing the mutual sliding at the time of fitting the front and rear ends of the two hot members.

The sliding speed at this time is desirably 100 mm / s or more.

Next, when the fitting portion is strongly clamped and the driving blade is operated at a high speed, the secondary scale dropping and the exposure and pressing of the active surface simultaneously proceed by the overlapping shearing action, whereby the joining can be completed.

That is, the generation of oxide scale can be suppressed, and bonding can be performed in a short time.

At this time, when the shear stroke is regulated to a specific value and the shearing action is stopped halfway, the projection state can be maintained, and mechanical coupling can be obtained at the same time.

That is, a strong bond can be obtained by a combination of metallurgical bonding and mechanical bonding.

3) On the other hand, regarding the joining time, the front and rear ends of the billet material as a hot material are preformed into a specific shape.
By separating from the joining operation and performing it in advance, it does not contribute to the joining time, the upset step at the time of joining and the time required for deburring can be omitted, and the shearing speed is increased, resulting in 3 Seconds or less,
It can be greatly reduced.

As described above, since the present invention is not fusion bonding, an upset process for discharging the scale is not required, and burrs are not generated as in the prior art. In addition to reducing the damage to the rolling roll in the generation and removal section, a further significant reduction in time can be realized.

The method and apparatus for joining hot-rolled materials of the present invention are based on the following findings. 1) Whether or not the hot-rolled material can be joined depends on the cleanliness C of the joining surface, the material temperature T, and the pressing pressure P.

In this case, it is almost the oxide scale that affects the cleanliness.

If there is no oxide scale, bonding is ensured by pressure bonding with an appropriate material temperature T and a corresponding pressing pressure P.

Therefore, it is not always necessary to melt the bonding surface.

In order to melt, energy for heating is required, and time is required for raising the temperature.

Further, it is necessary to increase the upset amount for discharging the oxide generated during the melting, so that the molten metal protrudes simultaneously with the oxide, so-called burr generation is inevitable, and a cutting process is required. There are disadvantages.

2) In order to reliably join in a short time, the key is how to secure the cleanliness C among the three joining elements of the pressing pressure P, the material temperature T, and the cleanliness C described in the above item 1). Become.

The joint surface can be cleaned by removing and discharging the existing oxide scale.

However, again, a new oxide scale is generated, which makes it difficult to bond with sufficient reliability due to the newly generated oxide scale.

3) On the other hand, when the material is pulled, the stretched portion can expose an active background without oxide scale, which is convenient for bonding. It is well known that once this is exposed to air, a new oxide film is formed immediately and can interfere with bonding.

According to the experimental results of the present inventors, when lap shear is performed, the boundary surface is elongated in the shearing process, and the lap surface is kept in a state of being cut off from the air. It was found that a state in which the pressing force was applied at a high temperature was obtained at a high temperature, and the three elements (cleanliness C, material temperature T, and pressing pressure P) were conveniently established and strong bonding was possible.

4) However, in the lap shear method, the oxide scale formed before that was still present at the boundary, and there was a limit to the strong bonding.

To improve this, the shear rate is increased, and the existing scale is pulverized and dispersed to obtain a strong bond.

The shear rate is preferably 100 mm / s or more.

It has also been confirmed by experiments that the lap shear method can further increase the joining strength by removing the oxide scale formed before that immediately before joining.

The present invention realizes an unprecedented strong joint by skillfully combining the above findings.

Next, an embodiment of the joining method of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

In FIG. 1, reference numeral 2 denotes a billet as a hot material, and reference numeral 1 denotes a billet transport table for transporting a billet 2 as a hot material.

Reference numeral 3 denotes a preforming machine for fitting the leading end and the trailing end of the billet 2 transported by the billet transport table 1.

Reference numeral 4 denotes a heating furnace for preventing the billet temperature from dropping after being processed by the preforming machine 3,
Reference numeral 5 denotes a transfer table for transferring the billet 2 from the heating furnace 4 to the next step.

Reference numeral 6 denotes a rough mill for rolling the billet 2 to a desired size, reference numeral 7 denotes a preceding material as a preceding billet material, and reference numeral 9 denotes a following material as a succeeding billet material.

Reference numeral 8 denotes a joining machine for joining the rear end of the preceding material 7 and the front end of the following material 9, and an intermediate mill 10 and a finishing mill 11 are arranged downstream of the joining machine.

Instead of the joining machine 8, a joining machine 12 may be arranged between the intermediate mill 10 and the finishing mill 11.

Since the billet 2 is usually conveyed in a high temperature state immediately after continuous casting, the front and rear ends are preformed by the preforming machine 3 on the entrance side of the heating furnace 4.

In the heating furnace 4, the temperature is soaked to about 1200 ° C., and in the rough mill 6, rolling is performed from 100 to 130 mm square to 40 to 70 mm square.

After that, they are introduced into the intermediate mill 10 in a number of rows, and are further rolled to the product size through the finishing mill 11 and carried out.

Conventionally, intermittent rolling was performed for each billet. However, in the present invention, the joining machine 8 is arranged on the exit side of the rough mill 6 and on the entrance side of the intermediate mill 10 so that The material 9 was joined while running to enable continuous rolling.

Here, the case of two-row joining / rolling is shown as an example, but since the upstream side is one row, joining work is performed alternately.

The joining machine comprises a rough mill 6 and an intermediate mill 10.
Or an intermediate mill 10 and a finishing mill 11
It may be arranged between them.

FIG. 2 shows another embodiment of the present invention, in which the preforming machine 3 ′ is arranged on the exit side of the rough mill 6.

When a billet having a billet temperature of normal temperature is supplied, it is difficult to perform a preforming operation on the entrance side of the heating furnace 4, and therefore, as shown in FIG. When the work is performed by providing the preforming machine 3 ', the same effect as that of FIG. 1 can be obtained.

The joining machine 12 is arranged on the exit side of the intermediate mill instead of the joining machine 8, and the effect is the same as that of FIG.

Next, the details and order of the joining method of the present invention will be described with reference to FIGS.

The preforming is performed before the joining, and is carried out as shown in FIG.
As shown in (1), the rear end is press-formed by the rear-end forming metal fitting 13 and the rear-end forming metal fitting 14, and almost simultaneously, the front end is press-formed by the front-end forming metal fitting 15.

As another method, the rear end may be formed by a forming roller 16 as shown in FIG. 6 or the front end may be formed by a cutter 17 as shown in FIG.

One of the rear end of the preceding hot steel bar and the front end of the following hot steel bar is formed into a convex I-shape, and the other is formed into the I-shape. It is desirable to process it into a concave V-shape that fits.

Here, as shown in FIG. 8, the rear end of the preceding hot steel bar is processed into a concave V-shape, and the front end of the subsequent hot steel bar is formed into a convex I-shape. Processed into
The rear end of the processed hot steel bar and the front end of the following hot steel bar are fitted to each other.

The shaping direction includes a diamond cross section shown in FIG. 4 and a square cross section shown in FIG. 5. The shaping may be performed according to the cross sectional shape of the rolling pass module, but the diamond cross section shown in FIG. Good results were obtained.

FIG. 8 shows the fitting state of the trailing end of the preceding material and the leading end of the following material at the time of joining.

At the time of joining, after strongly clamping each with the succeeding material clamp fitting 19 and the preceding material clamp fitting 20, the upper joining fitting 22 and the lower joining fitting 23 are pressed against each other. , The bonding is instantly completed.

FIG. 10 shows the joined state.

The joining portion 25 not only has the same strength as the base material but also cuts into the counterpart material, so that there is no detachment at the time of conveyance to the rolling roll, and stable joining can be ensured.

Further, since the joining is promoted by the reduction by the rolling rolls 24 in FIG. 8, stable continuity can be achieved without breaking even in tension rolling.

FIG. 9 shows such a joining sequence in detail. Material clamp, 2. 2. sliding fit; 3. Joint press, 4. high-speed shear bonding; Open, 6. 3 shows a rolling process.

1. In the step (1), the front and rear end preforming is processed into a fitting method at the material stage.

2. In the step (1), the primary scale is dropped by sliding fitting at the time of butt.

3. In the step (3), the lap shearing action is subsequently performed at a high speed to perform metallurgical bonding.

4. In the step (2), the shear stroke is regulated so that the mechanical joining is achieved.

On the other hand, the joining time is as described in 2.3.4. However, the above 3.4 is simultaneous progress, so actually 2.3.
Then, the joining operation is completed, and the time can be shortened at the same time.

Further, there is an advantage that the overlapped portion is flattened by the pressing action by the joining clamp, and the driving shearing action can be formed conveniently in joining and rolling.

The bonding time is a short time of 2.1 seconds in total in the steps 1 to 5.

The above-described fitting direction is such that the rear end dent,
The tip is convex, but the opposite is also possible. Next, the joining machine body will be described with reference to FIGS.

FIG. 11 shows a cross section of the joining machine, and FIG. 12 shows a vertical section of the joining machine.
A table roller 26 for transporting the preceding material 7 and the following material 9, an upper clamp head 32 and a lower clamp head 34 for clamping and holding the preceding material 7 and the following material 9, and supporting the upper clamp head 32 and the lower clamp head 34, respectively. Upper press table 31 and lower press table 33, upper clamp cylinder 30 for vertically moving upper clamp head 32 up and down via upper press table 31, swing cylinder 40 for returning to origin for synchronization with material, and a set of joining hardware A shift cylinder 41 for moving the material, a swing frame 27 that follows the material for synchronization with the material, a swing shaft 28 that serves as a fulcrum of the swing frame 27 that follows, a butt cylinder 42 that presses the materials, and shearing of the material. Driving fitting 2 for applying force or pressing force
1, a driving cylinder 18 for applying a shearing force or pressing force to the driving metal fitting 21; a joining lower metal fitting 2 for supporting the material from below when a shearing force or pressing force is applied to the material from above the material;
Consists of three.

The following material 9 being conveyed on the table roller 26
11 and the rear end protrusion of the preceding member 7 are fitted together as shown in FIG.

The leading end of the following material 9 is being rolled, but the conveying speed at this point is 0.2 to 10 m / s, the material size is 40 to 70 mm square, and the material temperature is about 900 to 1100 ° C. There are two rows.

Until the trailing material 9 catches up with the rear end of the preceding material 7 at the standby position of the welding machine 8, the table roller speed on the upstream side of the welding machine 8 is equal to the conveying speed of the preceding material 7 (the downstream speed of the downstream of the welding machine 8). (Table roller speed).

When the fitting portion reaches the joining machine 8, the material is clamped, the material is pressed by the butt cylinder 42 to lower the driving cylinder 18, and a shearing force is applied to the fitting portion by the driving fitting 21. .

Before applying the shearing force, the driving cylinder 1
8 can be lowered, and the driving metal 21 can apply a pressing force to the fitting portion from above and below to further improve the joining strength.

The method of synchronizing with the material is performed by clamping the material described above.
The swing frame with the fulcrum as a fulcrum follows.

The origin can be returned by the swing cylinder 40.

Then, in the next joining operation, since the adjacent strand is used, the complete set of joining fittings is moved by the shift cylinder 41 and joined in the same manner, thereby enabling continuous rolling.

FIG. 13 shows another embodiment, in which the rolling cylinder 29 is placed on a box and the pushing cylinder 29 is pressed.
Since the frame 45 is directed to the corner portion, the frame 45 has a shape convenient for mounting, and is built in the swing frame 27 via the cushion 44.

The operation of each part is the same as that of the joining machine 8 shown in FIGS. 11 and 12.

Next, the specific joining operation time and required time will be described.

For example, billet size: 120 squares × 4.
The case of 5 m length, weight: 550 kg, furnace discharge pitch: 42 sec, and furnace discharge temperature: 1150 ° C. will be described.

Table 1 shows an example of a normal billet rolling process.

[0100]

[Table 1]

Table 2 shows the joining operation procedure and the required time by the joining machine of the present invention.

[0102]

[Table 2]

The preforming is performed on the inlet side of the rough mill or the heating furnace which is not involved in the welding time, and the welding is performed on the inlet side of the intermediate mill shown in Table 1. The material cross section at the welding machine position is 2
Row rolling. It is necessary for the joining machine to join these materials alternately during running, but the furnace discharge pitch of the materials is 42se as described above.
c Since it is before and after, it will be good to join according to this. In other words, in the synchronous type traveling joining machine, it is only necessary to return to the original joining start position 42 seconds or less before the start of the first joining operation, and wait for the next joining.

On the other hand, in the joining machine of the present invention, as shown in Table 2,
A possible bonding cycle is a total of 2.1 + 2.8 = 4.9 seconds of the bonding time and the running return time, so that there is a sufficient margin for 42 seconds. The synchronous running distance at the time of welding is obtained from the welding time and the speed at the entrance of the intermediate mill, and is 2.1 sec.
Since × 0.2 m / s = 0.42 m, there is no problem in terms of space, and it can be easily incorporated into an existing line.

As described above, the primary scale dropping is most effective by the sliding action at the time of abutment. However, the sliding portion is further used by using auxiliary means such as high-pressure water injection, inert gas injection, and scale removal by an arc. Not only can it be further cleaned, but also the range of scale-down action is expanded for non-sliding parts,
Reliability can be improved by increasing the bonding area.

As described above, according to this embodiment, the following effects can be obtained.

1) Strong bonding can be performed in a short time.

2) Since burrs are not generated, damage to the rolling roll is reduced.

3) It is possible to improve the product yield, reduce the misroll, and automate the work.

4) It is possible to abort the joining operation between runs periodically to eliminate the division work on the exit side of the finishing mill.

5) Continuous intermediary / finish rolling greatly improves productivity.

Also, since strong bonding can be performed in a short time,
Further, the following effects are obtained.

6) The apparatus can be simplified without the need for a looper.

7) Since the synchronous running distance is small, the lifting / lowering operation of the transport table becomes unnecessary.

8) It can be easily incorporated into an existing line.

[0116]

According to the present invention, the generation of burrs due to joining is suppressed, the hot-bar steel is joined in a short time, and the occurrence of oxide scale is suppressed, and the hot-bar steel having excellent joining strength is rolled. It is possible to provide a hot-rolled bar joining device, a continuous rolling method, and a continuous rolling facility that can be provided.

[Brief description of the drawings]

FIG. 1 is a continuous rolling equipment according to one embodiment of the present invention.

FIG. 2 is a continuous rolling equipment according to one embodiment of the present invention.

FIG. 3 shows an example of a preforming machine according to the present invention.

FIG. 4 is a front view of a preforming process according to an embodiment of the present invention.

FIG. 5 is a front view of a preforming process according to an embodiment of the present invention.

FIG. 6 shows a preforming process according to an embodiment of the present invention.

FIG. 7 shows a preforming process according to an embodiment of the present invention.

FIG. 8 shows a joining / rolling state diagram according to an embodiment of the present invention.

FIG. 9 is an explanatory view of a joining procedure according to an embodiment of the present invention.

FIG. 10 is a detailed explanatory view of a bonding portion according to an embodiment of the present invention.

FIG. 11 is a side view of a joining machine according to an embodiment of the present invention.

FIG. 12 is a front view of a joining machine according to an embodiment of the present invention.

FIG. 13 is a front view of a joining machine according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Billet conveyance table, 2 ... Billet, 3 ... Preforming machine, 3 '... Preforming machine, 4 ... Heating furnace, 5 ... Transport table, 6 ... Rough mill, 7 ... Preceding material, 8, 12 ... Joining Machine,
9: trailing material, 10: intermediate mill, 11: finishing mill, 13,
14: rear end forming bracket, 15: front end forming bracket, 16: forming roller, 17: cutter, 18: driving cylinder,
19: Trailing material clamp fitting, 20: Leading material clamp fitting, 21: Driving fitting, 22: Upper joining metal fitting, 23: Lower joining metal fitting, 24: Rolling roll, 25: Joining part, 26: Table roller, 27: Shaking Moving frame, 28 ... swing shaft, 30
... upper clamp cylinder, 31 ... upper press table, 32 ... upper clamp head, 33 ... lower press table, 34 ... lower clamp head, 35 ... joining lower frame, 36, 39 ... metal fitting elevating cylinder, 40 ... swing cylinder, 41 ... Shift cylinder, 42 ... Butt cylinder, 43 ... Foundation, 4
4 ... cushion, 45 ... frame.

──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Toshiyuki Kajiwara 4-6-6 Kanda Surugadai, Chiyoda-ku, Tokyo Inside Hitachi, Ltd. (72) Inventor Takao Funamoto 7-1-1, Omikacho, Hitachi City, Ibaraki, Japan Shares Hitachi, Ltd. Hitachi Research Laboratory (72) Inventor Gen Nagakubo 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Hitachi Research Laboratory (56) References JP-A-6-238301 (JP, A) (58 ) Surveyed field (Int. Cl. ⁷ , DB name) B21B 1/00-11/00 B21B 15/00 B21B 45/04 B23K 20/00 340

Claims (14)

(57) [Claims] 1. A continuous rolling method for a hot steel bar in which a preceding hot steel bar and a subsequent hot steel bar are joined and rolled, wherein a rear end portion of the preceding hot steel bar and a rear end portion thereof are provided. Forming a desired shape such that the leading end of the hot-rolled steel material is fitted to the leading end of the hot-rolled steel material. Moving and fitting, and applying a shear force to the fitting portion between the rear end of the preceding hot steel bar and the leading end of the following hot steel bar, and joining.
Yes and the step of rolling the leading end of the hot steel bar material to the rear end and rear rows of the bonded hot steel bar material to the preceding continuous
And the sliding speed in the fitting step is 100 mm / s or more.
And the shear rate in the joining step is 100 mm / s or less.
A continuous rolling method for a hot-rolled steel material, characterized by the above . 2. A continuous rolling method for a hot steel bar in which a preceding hot steel bar and a subsequent hot steel bar are joined and rolled, wherein a rear end portion of the preceding hot steel bar and a rear end portion of the preceding hot steel bar are provided. Processing into a desired shape such as to fit the tip of the hot steel bar to be run,
The rear end of the processed preceding hot steel bar and the leading end of the following hot steel bar are continuously rolled, and the rear end of the preceding hot steel bar and the following heat are processed. The leading end of the steel bar is slid and fitted together, and a shear force is applied to a fitting portion between the rear end of the preceding hot steel bar and the leading end of the subsequent hot steel bar. And continuously rolling the rear end of the joined hot steel bar and the front end of the succeeding hot steel bar. 3. A continuous rolling method for a hot-rolled steel material in which a preceding hot-rolled steel material and a following hot-rolled steel material are joined and rolled, wherein a rear end portion of the preceding hot-rolled steel material and a rear end portion thereof are provided. After continuously rolling the leading end of the hot-rolled steel material to be run, it is formed into a desired shape such that the rear end of the preceding hot-rolled steel material and the leading end of the subsequent hot-rolled steel material are fitted. The front end of the preceding hot steel bar is slid and fitted with the rear end of the preceding hot steel bar and the rear end of the preceding hot steel bar and the trailing end thereof. A shear force is applied to the fitting portion of the hot steel bar to be joined to the front end of the hot steel bar to be joined, and the rear end of the joined hot steel bar and the front end of the subsequent hot steel bar are connected continuously. A continuous rolling method for a hot-rolled steel material, characterized by rolling. 4. A continuous rolling method for a hot-rolled steel bar in which a preceding hot-rolled steel bar and a subsequent hot-rolled steel bar are joined and rolled, wherein a rear end portion of the preceding hot-rolled steel bar and a rear end portion thereof are provided. Continuously rough-rolling the leading end of the hot-rolled steel material to be processed, and a desired process of fitting the rear end of the preceding hot-rolled steel material to the leading end of the following hot-rolled steel material. A step of processing into a shape, a step of continuously intermediate-rolling the rear end of the preceding hot steel bar and the tip of the following hot steel bar, and the rear end of the preceding hot steel bar A step of slidingly fitting the front end portion of the hot steel bar and the leading end of the subsequent hot steel bar, and fitting the rear end of the preceding hot steel bar to the front end of the subsequent hot steel bar. Joining by applying a shearing force to the joint, and continuously rolling the rear end of the joined hot steel bar and the front end of the subsequent hot steel bar Continuous rolling method of hot steel bar material and having a degree. 5. The continuous rolling method for a hot-rolled steel bar according to claim 4, wherein the rough rolling is performed in a single row, the intermediate rolling is performed in a double row, and the hot rolling is performed in a double row before the intermediate rolling. A continuous rolling method for hot steel bars, wherein the steel bars are joined alternately. 6. A continuous rolling method for a hot-rolled steel bar according to claim 4, wherein the joining operation before the intermediate rolling is periodically interrupted and the dividing operation after the intermediate rolling is abolished. Continuous rolling method for steel bars. 7. The continuous rolling method for a hot-rolled steel bar according to claim 2 , wherein a sliding speed in the fitting step is 100 mm / s or more, and A method for continuously rolling hot steel bars, wherein the shear rate is 100 mm / s or more. 8. The method for continuously rolling hot steel bars according to any one of claims 1 to 7, wherein the fitting portion is vertically pressed before applying a shearing force in the joining step. A method for continuously rolling hot steel bars. 9. A preceding hot steel bar and a following hot steel bar.
In a traveling steel bar joining device for joining steel bars,
The rear end of the hot-rolled steel bar and the tip of the subsequent hot-rolled steel bar
A pre-forming part for processing into a desired shape to fit the end
Construction means, the rear end of the preceding hot steel bar and the following
Sliding fit that slides and fits with the tip of hot steel bar
Means and the rear end of the preceding hot steel bar and the following
A shear force is applied to the fitting portion of the hot steel bar
Having shear joining means to fit together, wherein the sliding fit means
Means for adjusting the sliding speed of the roller to 100 mm / s or more;
Adjust the shear rate at the shear joining means to 100 mm / s or more
Running means for hot steel bars
Joint equipment. 10. The running joint of the hot steel bar according to claim 9.
A rear end portion of the preceding hot steel bar and the trailing end portion thereof;
Of the hot rod steel material to be inserted
Characterized by having pressing means for pressing and pressing
A running joining device for steel bars. 11. The method according to claim 9, wherein
In the traveling hot-rolled steel bar joining device, the traveling
The traveling speed of the hot rod steel material and the traveling joining device that travels
A material clamp synchronization means for performing speed tuning;
Drive means for returning to the home position and swinging the traveling joining device
Rocking means, and a rocking fulcrum for the rocking of the running joint device.
Running joint for hot bar steel characterized by having a moving shaft
Place. 12. The method according to claim 9, wherein :
In the hot-rolled steel bar running joining apparatus of the above,
Means in parallel along the direction of travel of the hot steel bar.
Individual, each fit by a plurality of said sliding fit means
The shearing means so as to arrange the shearing means at the joint.
Characterized by having moving means for moving the combining means
Hot running steel bar joining device. 13. A preceding hot steel bar and a following hot steel bar.
Continuity of hot steel bars with running joints to join steel
In a rolling plant, the rear end of the preceding hot steel bar and
The roughing is performed by continuously rough rolling the leading end of the subsequent hot steel bar.
A rolling mill and a trailing end of the preceding hot steel bar and the trailing end
Add a desired shape such that the tip of the hot steel bar fits.
Preforming machine to be machined and the rear end of the preceding hot steel bar
And the intermediate portion of the subsequent hot-rolled steel bar is continuously rolled.
Intermediate rolling mill, the rear end of the preceding hot steel bar and
Finishing of continuously rolling the leading end of the subsequent hot steel bar
Rolling mills are sequentially arranged, and the running joining device is
End of hot-rolled steel bar and tip of the following hot-rolled steel bar
Means for slidingly fitting each other, and the preceding hot steel bar material
Of the rear end of the steel bar with the front end of the following hot steel bar
Means for applying shearing force to the portion to join the
The joining device is located between the rough rolling mill and the intermediate rolling mill.
Is disposed between the intermediate rolling mill and the finishing rolling mill.
A continuous rolling equipment for hot steel bars. 14. A preceding hot steel bar and a following hot steel bar.
Continuity of hot steel bars with running joints to join steel
In the rolling equipment, the rear end of the preceding hot steel bar and the
It is desired to fit the tip of the subsequent hot steel bar
Preforming machine for processing into a shape, and the preceding hot steel bar
The rear end of the steel bar and the front end of
A rough rolling mill for rough rolling, and a rear end of the preceding hot steel bar material;
And the intermediate portion of the subsequent hot-rolled steel bar is continuously rolled.
Intermediate rolling mill, the rear end of the preceding hot steel bar and
Finishing of continuously rolling the leading end of the subsequent hot steel bar
Rolling mills are sequentially arranged, and the running joining device is
End of hot-rolled steel bar and tip of the following hot-rolled steel bar
Means for slidingly fitting each other, and the preceding hot steel bar material
Of the rear end of the steel bar with the front end of the following hot steel bar
Means for applying shearing force to the portion to join the
A joining device is provided between the preforming machine and the intermediate rolling mill.
Or between the intermediate rolling mill and the finishing rolling mill
Continuous rolling of hot steel bars
Equipment.