JPH0824941B2 - Forged steel pipe manufacturing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forged steel pipe production facility for producing a forged steel pipe with high efficiency.

[0002]

2. Description of the Related Art A forged steel pipe is obtained by continuously supplying a strip steel, heating the strip steel into a tubular shape, and forging the ends thereof. Then, in order to obtain a steel pipe having a desired diameter, a diameter reduction process is performed by a stretch reducer, after which it is cooled in a cooling bed and then finished by a straightening machine or the like in a finishing line to obtain a product. In such a forged steel pipe production line, by changing only the stretch reducer, steel pipes having various diameters can be produced from the mother pipe.

However, in order to change the product diameter, a stop time for changing the combination of the stretch reducer and the adjusting line is inevitably required, resulting in a loss of time. In addition, if the stretch reducer is recombined, the start work of the rolling line must be carried out accordingly, resulting in a large yield loss. Therefore, there is a problem that the manufacturing efficiency of the steel pipe is lowered. The present invention has been made in view of such circumstances, and an object thereof is to provide a forged steel pipe manufacturing facility capable of manufacturing a forged steel pipe with high efficiency.

[0004]

In order to solve the above problems, the present invention provides a forming means for forming a strip steel into a tubular shape, and a forging means for forging a side end portion of the steel strip to form a mother pipe. A reducer for reducing the diameter of the mother pipe to a steel pipe of the desired diameter,
A forged steel pipe manufacturing facility for continuously manufacturing a steel pipe, comprising a refining means for finishing a steel pipe formed by a reducer, and further provided in the vicinity of the reducer.
With a switching system for exchanging reducer, and the finishing line means has at least two finishing line line, whereas
While the refining line of the other is used for continuous operation,
Provided is a forged steel pipe manufacturing facility in which a straightening line is adjusted for a steel pipe to be manufactured next .

[0005]

In the present invention, when a steel pipe having a certain diameter is manufactured and then a steel pipe having a different diameter is manufactured, a crane or the like is provided.
For example, Ru using the exchange of only provided in the vicinity of the reducer
Therefore, the reducer can be replaced in an extremely short time (within 5 minutes), and the time loss at the time of changing the reducer can be reduced. Further, since there are two adjusting lines, when a steel pipe having a certain diameter is manufactured, the other adjusting line can be adjusted in preparation for the steel pipe to be manufactured next. Therefore, it is possible to reduce the time loss due to the adjustment of the adjusting line. In this way, the time loss associated with changing the diameter of the steel pipe to be manufactured can be significantly reduced, so that the forged steel pipe can be manufactured with high efficiency. Further, the equipment for producing the mother pipe during this period reduces the production speed and continuously operates, and the mother pipe is lined off during this period. Here, although a line-off loss occurs, the loss at the line start is larger, so that the yield loss can be reduced.

[0006]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a diagram showing a schematic structure of a forged welded pipe manufacturing facility according to this embodiment. The strip steel slit into a predetermined width by the slitter 1 is coiled. The strip steel coil is conveyed to the uncoiler-2, where the strip steel is unwound from the coil and is straightened by a straightening roll. The strip steel from the uncoiler-2 is supplied to the welding machine 3, and the tail end of the previous coil and the tip end of the next coil are welded to enable continuous supply of the strip steel.

The strip steel that has passed through the welding machine 3 is supplied to the heating furnace 5 through the looper 4. In the heating furnace 5, for example, the side end portion is about 1400 ° C., and the other portion is 1200 ° C.
Heat to about ℃ and prepare for the next forming and forge welding. The strip steel heated in the heating furnace 5 is formed into a tubular shape by the forming / forging machine 6, and the side ends thereof are forged to form a mother tube. Then, this mother tube is supplied to the stretch reducer 8. In the stretch reducer 8, the mother tube is reduced to a desired diameter. The mother tube is cut by the first hot saw 7 as needed at the start of work or when the line is turned off.

The steel pipe formed into a desired diameter by the stretch reducer 8 is cut into a product length by the second hot saw 10 and cooled in the first cooling table 11.
Next, the steel pipe is finished by a straightening machine, a chamfering machine or the like in the first adjusting line 12. The steel pipe that has passed through the conditioning line 12 is subjected to degreasing cleaning, marking, painting, etc.
It will be the final product.

In this way, after the manufacture of the steel pipe of a certain standard is completed, the steel pipe of the next standard is manufactured. In this case, first, the stretch reducer 8 is exchanged by the exchange 9. The switch 9 is, as shown in FIG. 2, the gantry - crane - and Action 21, following stretch les du - stretch support 23 Les du - frame advance is positioned in the vicinity of the support 82
2 and. The gantry crane 21 has two pairs of hoisting wires, first of which the hoisting stretch reducer 8 is hoisted from the gantry 8 ', then,
On the other hand, the next stretch reducer 23 is hung from the gantry 22 . Then, the stretch reducer 23 is mounted on the mount 8
Install on top of ´. By using such an exchange 9, the exchange work can be completed in an extremely short time (within 5 minutes) as compared with the conventional case. Incidentally, in the conventional reassembling work which does not use such an exchange machine, the exchange takes 30 minutes or more.

In this way, when the stretch reducer 23 is set, the diameter-reduced steel pipe is the second pipe.
After being cut by the hot saw 10, it is cooled by the second cooling table 13 and finished by the second adjusting line 14. In this case, the second refining line 14 is rearranged and adjusted in advance according to the standard of the next steel pipe during the previous operation using the first refining line 12. Therefore, the time loss (2 to 3 hours) for changing and adjusting the adjusting line is substantially eliminated. During this rearrangement, the forming and forging machine is continuously operated at the lowest speed. During this time, the mother tube produced is cut by the first hot saw 7 and line-off.

As described above, the time loss of the replacement of the stretch reducer and the rearrangement / adjustment of the adjustment line is remarkably reduced, and the yield loss occurring at the start of the production line is less than the line-off loss of the mother tube. Therefore, it is possible to manufacture the forged steel pipe extremely efficiently. In this embodiment, the crane is used to replace the stretch reducer, but the present invention is not limited to this, and various means can be used.

[0013]

According to the present invention, there is provided a forged steel pipe manufacturing facility capable of manufacturing a forged steel pipe with extremely high efficiency.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a forged steel pipe manufacturing facility according to an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a stretch reducer exchanger used for the equipment of FIG.

[Explanation of symbols]

5; Heating furnace, 6; Forming / forging machine, 8; Stretch reducer, 9; Exchanger, 12; First adjusting line, 14; Second
Refinement line.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display B21C 37/08 D

Claims (1)

[Claims] 1. A forming means for forming a strip steel into a tubular shape, a forging means for forging a side end portion of the strip steel to form a mother pipe, and for reducing the diameter and thickness of the mother pipe into a steel pipe having a desired diameter. And a refiner for finishing the steel pipe formed by the reducer, which is a forged steel pipe manufacturing facility for continuously manufacturing a steel pipe, and further in the vicinity of the reducer. comprising a switch for exchanging provided with Les <br/> inducer, and the finishing line means has at least two finishing line lines, one seminal
While the conditioning line is used for continuous operation, the other conditioning line
A forged steel pipe manufacturing facility, wherein the in is adjusted for the next steel pipe to be manufactured.