JPH10225706A - Journey joining state determination method, jigging joint method, and jigging equipment - Google Patents

Abstract

(57) [Summary] The present invention relates to a running welding (joining) equipment,
Provided is a method for accurately judging a joint state (strength) obtained by running joining at a stage after joining is completed and before rolling, and a running joining facility using this judgment method. SOLUTION: A traveling body mounted with a joining device and a clamp device is disposed so as to be able to travel forward and backward along a transport direction of a material to be transported while pushing down a transport roller interfering with the traveling body. In the equipment, the leading material and the following material are clamped and joined by a clamp device with a clamp device, and after joining is completed, the joined portion is pulled by the clamp device with a load corresponding to the tensile stress at the time of finish rolling. The tensile displacement or tensile stress of the device is measured, and the joining state of the joint is determined based on the displacement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, the indirect transfer of a traveling object equipped with a joining device and a clamp device to a conveyed material conveyed by a conveying roller in a steel industry or the like. The present invention relates to a method for judging a joining state of a joint, a joining method during traveling, and a joining device for traveling, which are applied to a joining device during traveling.

[0002]

2. Description of the Related Art For example, in the steel industry, there is a step of joining steel materials conveyed back and forth continuously in a hot continuous rolling line. In order to improve the productivity of the hot continuous rolling, There is an increasing demand for so-called running joining, in which joining is performed during the transfer of steel material.

Conventionally, as a running joining apparatus for performing this running joining, for example, as shown in FIG. 5, a traveling body b equipped with a welding device a and clamping devices ka and kb is provided with a driving device (not shown). ), Is movably disposed on a track r laid on a gantry d by a driving device e, and the traveling body b is continuously transported back and forth by the transport rollers. While traveling synchronously with sa and the following steel material sb, the rear end of the preceding steel material sa and the tip of the following steel material sb are clamped by the clamp devices ka and kb, and the leading steel material sa being conveyed by the conveyance roller d is clamped. There has been proposed a running welding apparatus configured to weld a butt portion between a rear end surface and a front end surface of a following steel material during running.

[0004] In the case of running joint by this running welding equipment, if the quality of the joint is not good, the joint is destroyed in the finish rolling process, making continuous rolling operation impossible and requiring semi-finished product processing. This also leads to an increase in cost.

Conventionally, there is no means for accurately judging the quality of a joint. Therefore, judgment is made by visual inspection. However, this is an appearance inspection, and it is not possible to accurately inspect internal defects. For this reason, there is a problem that it is not possible to prevent the joint breakage caused in the finish rolling process due to the internal defect.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a running joint in the above-mentioned running joining equipment, wherein the state of the joined portion obtained by the running joining is accurately determined at a stage after the completion of the joining and before the rolling. It is an object of the present invention to provide a state determination method and a running joint method when a joint break occurs, and a running joint equipment for implementing these methods.

[0007]

Means for Solving the Problems A first invention of the present invention is:
A traveling body equipped with a joining device and a clamp device is moved by using a traveling joining device which is disposed so as to be capable of traveling forward and backward along the transport direction of the material to be transported while pushing down a transport roller which interferes with the traveling body. In the inter-joining method, the leading material and the succeeding material are joined by clamping and butting with a clamp device, and after joining is completed, the joined portion is pulled by the clamp device with a load corresponding to the tensile stress at the time of finish rolling. And measuring a tensile displacement amount or a tensile stress of the clamp device and determining a joint state of the joint portion based on the displacement amount.

According to a second aspect of the present invention, a joining state is determined by the running joint state determining method according to the first aspect of the present invention. After the introduction, the transport roller in front of the traveling carriage pushed down by the cam plate is raised, and then the following material is passed through, followed by introduction into a finish rolling mill.

According to a third aspect of the present invention, in the second aspect, the rear end of the succeeding material whose joint is broken is cut and removed, and the subsequent material whose front end is cut and removed is joined to the rear end. This is a running joining method characterized by being introduced into a finish rolling mill.

A fourth aspect of the present invention is positioned as an example of a running joining apparatus having a running joining state determining device for carrying out the first invention. In a traveling joining apparatus which is disposed so as to be able to travel forward and backward along the transport direction of a material to be transported while pushing down a transport roller interfering with the traveling body, a tensile stress applying device and a tensile displacement amount of the clamp are provided to the clamp device. Alternatively, the present invention provides a running joint apparatus provided with a joining state determining device having a displacement measuring device for measuring a tensile stress.

A fifth aspect of the present invention is positioned as an example of a running joint apparatus having a running joint state determining device for carrying out the second invention. In a traveling joining apparatus which is disposed so as to be able to travel forward and backward along the transport direction of a material to be transported while pushing down a transport roller interfering with the traveling body, a tensile stress applying device and a tensile displacement amount of the clamp are provided to the clamp device. Or a joining state determination device having a displacement measurement device for measuring tensile stress, a return device for a transport roller in front of the traveling body, and a cutting device disposed on the entrance side of the finishing mill. This is a running joint.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, when a certain period of time has elapsed after completion of running joint,
At the stage before rolling, it is pulled with a tensile stress corresponding to the load at the time of rolling, and the joint strength is determined based on the amount of tensile displacement, and the amount of tensile displacement when a tensile stress equivalent to the actual rolling load is applied, The joining state can be accurately determined by confirming beforehand whether or not it is within a range of a tensile displacement amount which does not cause rolling fracture, which is obtained through a rolling experiment.

FIG. 4 shows, for example, a thickness of 40 mm and a width of 120 mm.
This figure shows the relationship between the amount of tensile displacement at the joint obtained by welding 0 mm general structural steel by running welding and the frequency of joint fracture during the rolling process. Is less than 3 mm indicates that the joint breaks hardly occur, and when the tensile displacement of the joint exceeds 3 mm, the joint breaks and the clamp device reaches the set retreat position 15 mm,
This indicates that the continuity of rolling cannot be maintained.

Therefore, for example, a range in which the tensile displacement of the joint does not cause a break of 3 mm or less is set as an acceptable range, and if the tensile displacement of the joint exceeds 3 mm, the joining is rejected (the joint breaks). ) May be taken as necessary.

The above is also the same when the steel type, the size, the welding means and the rolling conditions are changed, and the joint breakage does not occur in the rolling process according to these conditions through a rolling test in advance. By determining the amount of tensile displacement of the joint and comparing the amount of tensile displacement of the joint after the completion of joining, the pass / fail judgment of the joint can also be accurately performed.

In the case of a hot finish rolling mill, the tensile stress between the rolling stands differs depending on the type of steel, the size, and the like. Is given in accordance with the tensile stress. Normally, the tensile stress between the rolling stands is 0.
Since it is 5 to 3.3 kg / cm ² , the tensile stress to be applied to the joint at the time of the pass / fail judgment of the joint is set in substantially the same range.

A joining state judging device for carrying out the joining state judging method of the present invention is provided, for example, by disposing a hydraulic cylinder provided with a displacement detecting sensor in a clamping device, clamping the rear end of the preceding material by clamping with the clamping device. It has a configuration in which running welding is performed in a state where the leading ends of the following steel materials are pressed against each other, and when a certain time has elapsed, the hydraulic cylinder is pulled at a set load, and the displacement detection sensor measures the amount of tensile displacement or tensile stress. .

Although the result of the measurement of the amount of tensile displacement or tensile stress can be visually judged by this joint state judging device, the pass / fail judgment can be made by inputting the measurement information of the amount of tensile displacement by the detection sensor to the pass / fail judgment device. Can be determined and transmitted by a display device or an alarm device.

If a defective joint (joint breakage) is determined, the leading end of the following material is passed through in a state where it is not joined to the rear end of the preceding material. Since the transport roller near the leading end of the following material is not supported by being pushed by the traveling body (cam plate), the leading end of the following material is placed on the further forward transport roller in a supportable state before being placed on the transport roller. It may not go down and run smoothly on the transport roller.

Therefore, the transport roller in front of the traveling body pushed by the traveling body (cam plate) is returned, so that the leading end of the following material can be smoothly placed on the restored transport roller and can be passed. preferable. In the case of a defective joint, the leading material 1a and the following material 1b may be passed through as they are and introduced into the finishing mill 5, but the following material 1a
It is preferable to join the front end of the succeeding material to the rear end of b in order to increase the continuity rate.

In the case of a defective joint (broken joint), the rear end of the preceding material and the front end of the succeeding material are cut and removed, and a command for changing the rolling schedule is transmitted. Is preferable. For this reason, as the running joint equipment, the joint failure with the pass / fail judgment device (joint fracture)
When the determination is made, a device for returning the transport roller in front of the traveling body pushed by the traveling body (cam plate), the rear end of the preceding material, and the distal end of the following material are cut off based on the determination information. It is preferable to install a cutting machine to be removed, a device for changing the rolling schedule, and an arithmetic and control unit for controlling these devices.

[0022]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, as shown in FIG. 1, a heated billet 1 is hot-rolled by a rough rolling mill 2, and the obtained steel material 1 o is temporarily stored in a coil box 3, and then transferred to a finishing mill 5 by transport rollers 4. In the case where the steel plate 1p is manufactured by hot continuous rolling with the finishing mill, the steel materials 1a and 1b continuously conveyed back and forth by the conveying roller 4 between the coil box 3 and the finishing mill 5 are run. This is a case in which the present invention is applied to a running welding facility for welding between members.

As shown in FIG. 2, the traveling welding equipment 6 includes a traveling body on which a clamping device 7a, 7b provided with an upper clamp plate 7o and a lower clamp plate 7u which are raised and lowered by a hydraulic cylinder 7c and a welding device 8 are mounted. 9 is a preceding steel material 1a conveyed by the conveyance roller 4 and a succeeding steel material 1b succeeding the preceding steel material 1a.
While running in synchronism with the above, the rear end of the preceding steel 1a and the front end of the following steel b are clamped by a clamp device, and the hydraulic cylinder 14 presses the butted portion of the preceding steel 1a and the following steel 1b. , And a welding device 8.

As shown in FIG. 2, the hydraulic cylinder 14 is provided with a hydraulic pump 16 for controlling the pressing force of the butt and the load when the joint wp is pulled after the joining. The hydraulic pump 16 is controlled by the arithmetic unit 20 by the control unit 1.
8 is controlled. The output of the hydraulic pump 16 according to the type of the steel to be joined, the butt pressing force by size, and the rolling load is input to the arithmetic unit 20, and the output of the hydraulic pump 16 is controlled via the control unit 18. can do.

The hydraulic cylinder 14 has a joint w
A displacement detection sensor 19 for measuring the amount of tensile displacement when p is pulled is provided. This displacement detection sensor 19 includes:
A computing device 20 for making a pass / fail determination is connected, and a display device 21 and an alarm device 22 are connected to the computing device 20. The arithmetic unit 20 receives the determination criteria for the type and size of the steel material to be joined, and can determine whether the joint wp is acceptable based on detection information from the displacement detection sensor 19.

FIG. 2 shows a state in which the traveling body 9 is run, and the conveying roller 4 is retracted to the dotted line position via the cam lever 13 by the cam plate 12 provided below the traveling body. 7b shows a state in which the leading steel member 1a and the following steel member 1b are clamped, and welding is performed by the welding device 8 during running. In the figure, reference numeral 17 denotes a hydraulic cylinder for retracting and returning the transport roller 4 and has a hydraulic circuit (not shown).

In the present invention thus constructed, the rear end portion of the preceding steel member 1a and the front end portion of the following steel member 1b are clamped by the clamp devices 7a and 7b, and the rear end surface of the preceding steel member 1a and the trailing member 1b are clamped. After the tip surfaces of the joints are butt-pressed by the hydraulic cylinder 14 and welded by the welding device 8, that is, in the state of FIG. 3, the clamping device 7 b is moved in the direction of the arrow by the hydraulic cylinder 14 to When pulled, the joint extends and the distance between the clamping devices 7a, 7b changes from ao to ax.

Here, ao-ax = ae is set at the junction wp
The amount of tensile displacement ae is measured by the displacement detection sensor 19, and the arithmetic unit 20 performs a predetermined rolling process as shown in FIG.
Pass / fail is determined by comparing the displacement amount with which p does not break.

The result of the pass / fail judgment can be transmitted by the display device 21 and the alarm device 22, and necessary processing can be performed. For example, when a joint failure (joint breakage) is determined, the following material 1b is passed through in a state where the leading end of the following material 1b is not joined to the rear end of the preceding material 1a. However, at this time, if the transport roller 4a close to the leading end of the following material is pushed by the cam plate 12 of the traveling body 9, the transport roller 4a is placed on the forward transport roller 4b which is in a supportable state. The leading end of the row material may be lowered, and may not be smoothly placed on the transport roller 4 in front.

Therefore, the transport roller 4a in front of the traveling body pushed by the cam plate 12 of the traveling body 9
Is temporarily returned to a state where the leading end of the following material 1b can be supported, so that the leading end of the following material can be smoothly placed on the transported roller 4a and passed therethrough.

Here, the temporary return operation of the transport roller 4a is performed by retreating the front end 12a of the cam plate 12 pushing the transport roller 4a by the hydraulic cylinder 14a. The operation of the hydraulic cylinder 14a is controlled by the arithmetic
The control is performed by controlling the output of the hydraulic pump 16a via a.

In the case of a defective joint (broken joint), the rear end of the preceding material 1a and the front end of the following material 1b are cut and removed by the cutting machine 15 disposed in front of the transport roller 4a. It is preferable to pass through the plate. The operation of the cutting machine 15 is controlled by the arithmetic unit 20 via the control unit 18b.

In this case, as described above, in a state where the leading end of the succeeding material 1b is not joined to the rear end of the preceding material 1a, the succeeding material 1b is joined to the succeeding material while running to form the leading material 1b. Since the sheet is subsequently passed and introduced into the finish rolling mill 5, a process of changing the rolling schedule including running joining is performed.

The present invention is not limited to the above embodiment. For example, in the embodiment, the present invention is applied to a running joint for performing running joining for steel materials, but the present invention can be applied to other steel materials and non-ferrous metal materials. Therefore, for example, a joining device, a clamp structure, a load applying structure, a kind arrangement of a displacement detection sensor, a displacement detection, an arithmetic control, a judgment result transmission system, a conveyance roller, a cam plate, a conveyance roller, and an evacuation, which constitute the running joining equipment. -The return structure and the like are changed within the range that satisfies the scope of claim 1 or claim 4 according to the application target, the rolling condition degree, and the like.

In the example shown in FIG. 4, when the amount of tensile displacement was 3 mm or less, it was judged as acceptable, and when 15 mm, the joint was broken and the test was rejected. Is set based on the results and the like.

(Embodiment 2) Using the running joint equipment as shown in FIGS. 1 to 3, the temperature continuously supplied from the coil box is 950 to 1050 ° C. and the thickness is 30 to 50 m.
m, 1200mm wide general structural steel
After running butt joining (single-sided joining) by arc welding at the stage before the finish rolling mill, in finish rolling, the rolling temperature is 900 ° C., the rolling reduction is 30 to 60%, and the rolling speed is 800 to 800.
Hot finish rolling under conditions of 1500 m / min and maximum tension of 3.0 kg / mm ² , thickness 1.2 to 8.0 mm, width 600 to 22
A 00 mm steel plate was manufactured. In the finish rolling process, the joining state determination method of the present invention was applied to determine the pass / fail of the running joint, and the result of the determination and the presence or absence of breakage of the joined portion in the finish rolling process were investigated.

[0037] [junction tensile Conditions tensile stress: 2.0 kg / mm ² acceptance criteria Pass: tensile displacement 3mm or less failed: rupture in joint breaking or finish rolling process at the time of tensile stress load (1 ) Tensile displacement 15mm: Joint breaks when tensile stress is applied

As a result, when the amount of tensile displacement is 3 mm or less, there is no breakage of the joint in the finish rolling process, and both the running joint and the finish rolling are smoothly performed. It was good. However, when the amount of tensile displacement exceeded 3 mm, almost the joint was broken, and the amount of tensile displacement reached 15 mm.

In this case, the cutting machine 15 cuts the rear end portion of the preceding material 1a and the broken portion of the front end portion of the following material 1b, passes through the plate, and introduces the preceding material 1a into the finish rolling mill 5. Finish rolling was performed, and the succeeding material 1b was joined to the succeeding material while running and was not joined to the preceding material 1a, and was introduced into the finishing mill 5 following the preceding material 1a and rolled.

When the amount of tensile displacement is more than 3 mm, the joint break may not be broken when a tensile stress is applied to determine pass / fail. In this case, the joint is directly introduced into the finishing mill 5 for finishing. Rolling was performed. But in this case,
During the finish rolling process, the joint was almost broken, and a rolling trouble occurred, so the rolling operation was stopped.

From the above, it was confirmed that when the amount of tensile displacement was more than 3 mm, it was necessary to perform necessary processing as a defective joint. It is a priority to take measures to prevent the occurrence of a joint failure, but under the present circumstances where it is unavoidable to cause a failure in the joint, the joining state determination method and the running joint method of the present invention are extremely effective.

[0042]

According to the present invention, for example, at the stage before rolling, the joint is pulled with a tensile stress corresponding to the load at the time of rolling, and the state of the joint (strength) is determined based on the amount of tensile displacement. By checking whether the rolling displacement is within the range of the tensile displacement that does not cause rolling breakage, the joining state can be easily and accurately determined, and a process can be selected to perform a smooth rolling operation. Accordingly, it is possible to avoid the occurrence of inconveniences such as the suspension of the rolling operation and the semi-finished product processing, and to realize a smoother continuous rolling operation.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side schematic explanatory view showing an example of an arrangement of a hot continuous rolling facility to which a running joining facility of the present invention is applied.

FIG. 2 is a partially cross-sectional enlarged side view schematic explanatory view showing a structural example of a running welding equipment for implementing the present invention.

FIG. 3 is an enlarged schematic partial sectional side view showing a tensile operation and a displacement amount of a joint in the embodiment of FIG. 3;

FIG. 4 is an explanatory diagram showing the relationship between the amount of tensile displacement in welding and the fracture of the joint in the rolling process.

FIG. 5 is a schematic side view showing an example of a conventional running welding equipment.

[Explanation of symbols]

 1: steel billet 1a, 1b: steel material (leading material, trailing material) 1p: steel plate 2: rough rolling machine 3: coil box 4, 4a, 4b: transport roller 5: finishing rolling machine 6: running welding equipment 7a, 7b: Clamping device 7c: Hydraulic cylinder 7o Upper clamp plate 7u Lower clamp plate 8: Welding device 9: Traveling body 10: Drive device 11: Track 12: Cam plate 12a: Tip 13: Cam lever 14, 14a: Hydraulic cylinder 15: Cutting machine 16, 16a: Hydraulic pump 17: Hydraulic cylinder 18, 18a, 18b: Control device 19: Displacement detection sensor 20: Computing device 21: Display device 22: Alarm device

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takaaki Nakamura 1 Nishinosu, Oji, Oita City, Oita Prefecture Inside Nippon Steel Corporation Oita Works (72) Inventor Hiroshi Tsune 1 Nishinosu, Oita City, Oita Prefecture New Japan (72) Inventor Keiji Tanaka Inventor Keiji Tanaka Oita, Oita 1

Claims (5)

[Claims] 1. A traveling device in which a traveling body on which a joining device and a clamp device are mounted is disposed so as to be able to travel forward and backward along a transporting direction of a material to be transported while pushing down a transporting roller interfering with the traveling body. In the running joining method using the joint equipment, the preceding material and the succeeding material are joined by clamping and butting with a clamp device, and after joining is completed, the joined portion is subjected to a tensile stress at the time of finish rolling by the clamp device. A method for determining a running joint state, comprising: measuring a tensile displacement amount or a tensile stress of a clamp device at that time, and judging a joint state of the joint portion based on the displacement amount. 2. A joint state is determined by the joint state determination method according to claim 1, and when a joint break is determined,
After passing the preceding material and introducing it to the finish rolling mill, raise the transport roller in front of the traveling cart pushed down by the cam plate, and then pass the following material and introduce it to the finishing mill. Characteristic method of joining between runs. 3. The method according to claim 1, wherein the rear end of the succeeding material whose cutting portion has been broken is cut and removed, and the succeeding material whose front end is cut and removed is joined to the rear end and then introduced into a finishing mill. 3. The method according to claim 2, wherein: 4. A traveling device in which a traveling body on which a joining device and a clamp device are mounted is arranged so as to be able to travel forward and backward along a transport direction of a material to be transported while pushing down a transport roller interfering with the traveling body. In a combined facility, a running joint device includes a clamp device and a joining state determination device including a tensile stress applying device and a displacement measuring device for measuring a tensile displacement amount or a tensile stress of the clamp. 5. A running joint in which a traveling body on which a joining device and a clamping device are mounted is disposed so as to be able to travel forward and backward along a transport direction of a material to be transported while pushing down a transport roller interfering with the traveling body. In a combined facility, a joining state determination device having a tensile stress applying device and a displacement measuring device for measuring a tensile displacement or a tensile stress of a clamp in a clamp device, a returning device of a transport roller in front of a traveling body, and a finishing mill And a cutting device disposed on the entrance side.