JPS62292281A - Roller for producing welded pipe - Google Patents

Abstract

PURPOSE:To effectively prevent the occurence of buckling creases of a coil plate and to make the whole of a welded pipe producing device compact by providing a temperature adjusting element to heat or cool said plate to rollers for producing a welded pipe to roll the surface of the coil plate. CONSTITUTION:In a fin pass zone of the welded pipe producing device, after the coil plate 11 is formed to nearly complete roundness by the rollers 12-15 for producing the welded pipe, both edge parts 22 and 22 of the coil plate 11 are welded by a welding means (omitted in figure) to obtain the welded pipe. Many grooves 17 are provided at equal intervals in a peripheral direction to the outside peripheral surface of main bodies of the rolling rollers 12, 13 and 14 to roll a side part and the lower surface of the coil plate 11 and induction coils 16 are buried therein respectively in the aforementioned welded pipe producing device. On the other hand, nozzles 24 for cooling are provided at equal intervals to both sides of a flange part 23 of the rollers 15 corresponding to both the edge parts 22. Both edge parts 22 are cooled by blowing air, etc., from the aforementioned nozzles 24 and the other part 26 other than both the edge parts 22 is heated by the induction coils 16 to moderate the compressive stress while forming the coil plate 11 by the aforementioned rollers 12-15.

Description

[Detailed description of the invention] 3. Detailed description of the invention (Industrial application field) This invention relates to a roller for manufacturing welded pipes.

(Prior art) As a conventional example of a welded pipe manufacturing method, for example, Japanese Patent Application Laid-open No. 58-
184073 can be mentioned. This manufacturing method will be explained based on FIGS. 9 to 11.
In the figure, l denotes a coil plate material, and this coil plate material 1 is formed into a circular cross section by a group of forming rolls 2...2, and both edges 4.4 are formed by fin pass rolls 3... Then, in a welding step 5, both edges 4.4 are welded to produce a welded pipe.

In this case, in the forming process, the vicinity of both edges 4.4 undergoes larger tensile plastic deformation than the other parts 6, so in the fin pass zone, the vicinity of both edges 4.4 undergoes compression. Residual stress and tensile residual stress are generated in the other parts 6, and as a result, both edges 4.4
Buckling wrinkles occur in the vicinity of the weld, creating the problem that sufficient welding cannot be performed. Therefore, in the above conventional example, during the process from forming to welding, by heating and expanding the other portion 6 other than the vicinity of the edge 4.
．． Compressive stress in the vicinity of 4 is relaxed to prevent buckling wrinkles from occurring. In this case, a high frequency induction heating device is used as the heating device.

(Problems to be Solved by the Invention) By the way, when the above welded pipe manufacturing method is to be implemented, for example, in a forming line for small and medium diameter pipes, the distance between each roll stand is narrow, so It is often difficult to install the above-mentioned high-frequency heating device. Furthermore, it is often difficult to install a cooling device to cool both edges of the coil plate material.

This invention was made to solve the above-mentioned conventional drawbacks, and its purpose is to provide a roller for manufacturing welded pipes that can significantly reduce the installation space for a heating device or a cooling device. be.

(Means for Solving the Problems) Therefore, the roller for manufacturing welded pipes of the present invention is configured to roll on the surface of a coil plate material and is equipped with a temperature control element for heating or cooling the plate material. be.

(Function) As described above, the welded pipe manufacturing roller of the present invention is equipped with a temperature control element for heating or cooling the coil plate material, so it rolls on the surface of the coil plate material to form the coil plate material. At the same time, the coil plate material can be heated or cooled by the temperature control element.

Therefore, it can be effectively used as a heating device or cooling device to prevent the occurrence of buckling wrinkles in the coil plate material.
It is possible to eliminate the need for installing a heating device or a cooling device between the roll stands.

(Example) Next, specific examples of the roller for manufacturing welded pipes of the present invention will be described in detail with reference to the drawings.

In FIG. 1, 11 is a coil plate material in the fin pass zone, and 12 to 15 are welded pipe manufacturing rollers that roll on the surface of the coil plate material 11 to form the coil plate material 11. Each of them is supported by a roll stand (not shown) so as to surround the periphery.

Among these welded tube manufacturing rollers 12 to 15, welded tube manufacturing rollers 12, 13, and 14 corresponding to both sides and the bottom of the coiled plate material 110 are equipped with induction coils 16 for high-frequency induction heating of the rolled plate material 11. Integrated. That is, these three welded pipe manufacturing rollers 12.
On the outer circumferential surface of the main body of 13.14, coil mounting grooves 17 are formed along the axial direction at equal intervals in the circumferential direction on one half of the axial end and half of the other end. , the induction coil 16 is inserted into these valley grooves 17...17,
It is fixed. The coil mounting groove 17 is, for example, a second
As shown in the figure, the induction coil 16 is formed to have a rectangular cross section, or a triangular cross section, that is, a dovetail groove shape, as shown in FIG. At this time, the induction coil 16 is arranged deep within the groove 17 in order to maintain a constant gap between the induction coil 16 and the coil plate material 11.

Further, a passage 21 for passing cooling water 20 is formed inside the induction coil 16 . It is preferable that the entire bodies of the three welded tube manufacturing rollers 12, 13, and 14 or the peripheral portions of the coil mounting grooves 17 be formed of a non-magnetic material. On the other hand, the welded tube manufacturing roller 15 corresponding to the upper part of the coil plate material 11 has an edge 22 of the coil plate material 11.
A large number of cooling nozzles 24 are integrally formed to cool the vicinity. That is, a flange 23 is formed on the outer periphery of the main body of the welded tube manufacturing roller 15, and the flange 23 is formed between the edges 22 and 22 of the coil plate material 11 that is being formed into a tubular shape. Nozzle holes 25 for cooling nozzles 24 are formed at equal intervals in the circumferential direction on the outer periphery of the main body.

FIG. 4 is an enlarged view of the cooling nozzle 24, and the cooling medium (for example, air, water, etc.) injected from the nozzle hole 25 of each cooling nozzle 24 is transferred to the welded pipe manufacturing roller 15. As it rotates, the edge 22.2 of the coil plate 11
Sprayed on 2. In addition, in the above, the case where all the welded pipe manufacturing rollers 12 to 15 are equipped with a temperature control element such as the induction coil 16 or the cooling nozzle 24 is given as an example, but the case where the rollers 12 to 15 for manufacturing welded pipes are equipped with a temperature control element such as the induction coil 16 or the cooling nozzle 24 is taken as an example. As for the welded pipe manufacturing rollers 12 and 13, ordinary rollers without these may be used.

When forming the coil plate material 11 using the welded pipe manufacturing rollers 12 to 15, each welded pipe manufacturing roller 12 to
15 are placed on both upper and lower sides of the coil plate material 11, as shown in FIG. Then, each welded pipe manufacturing roller 12 -
By rolling the coil plate material 15, the coil plate material 11 is formed.

As a result, the shape of the coil plate material 11 becomes closer to that of a tube body. On the other hand, while forming the coil plate material 11 as described above, the edge 22.
The square portion 26 other than the vicinity of 22 is heated and expanded. Further, by injecting cooling air, for example, from the cooling nozzle 24 provided on the welded pipe manufacturing roller 15, the above-mentioned both edges 2
2. Perform cooling near 22. FIG. 5 shows the optimum temperature distribution when performing these heating and cooling operations. If the temperature distribution near the edges 22 and 22 is kept low in this way while heating the other portions 26, When obtaining a temperature difference effective for preventing the occurrence of wrinkles, it is possible to keep the maximum heating temperature relatively low. Therefore, it is effective when there is a limit to the heating temperature, and the amount of heat required may be small, so that energy loss can be reduced. As described above, since the passage 21 for passing the cooling water 20 is formed inside the induction coil 16, the welded tube manufacturing roller 12.1 is heated during heating.
3.14, the temperature rise of the main body itself will be prevented. Note that, if necessary, measures may be taken to insulate or cool the roller shaft in order to prevent grease from coming off.

In addition, since the entire body of the welded tube manufacturing roller 12.13.14 or the surrounding area of the induction coil 16 is made of non-magnetic material, all the generated magnetic field enters the coil plate material 11, and therefore the roller 12.13.14 Overheating is prevented and good thermal efficiency is maintained.

FIG. 6 shows a modification of the welded tube manufacturing rollers 12, 13, and 14 corresponding to both sides and the bottom of the coil plate material 11. That is, as is clear from the figure, when the induction coil 16 is integrally assembled into the welded tube manufacturing roller 27, the coil mounting grooves 17...1 are formed in a spiral shape on the outer peripheral surface of the main body.
7, and the induction coil 16 may be inserted and fixed into the spiral grooves 17. In other words, the induction coils 16 are arranged in a pancake shape, and in this case, by allowing each induction coil 17 to be independently controlled, more delicate control of the amount of heating can be performed.

FIG. 7 shows the case where the coil plate material 11 is formed in the forming zone. The figure shows a case where welded pipe manufacturing rollers 12.13 equipped with induction coils 16 are arranged corresponding to both sides of the coil plate material 11, but these rewelded pipe manufacturing rollers 12.13 are ,
Ordinary rollers without induction coils 16 may also be used.

By using it in the forming zone in this way, it is also possible to prevent buckling wrinkles in the vicinity of both side portions 22 and 22 of the coil plate material 11.

FIG. 8 shows the initial stage of the forming zone. At this stage, the lower surface of the coil plate material 11 is supported by an elongated drum-shaped roller 31, and the upper surface center part is pressed by a tire-shaped roller 32. It is preferable to use a welded pipe manufacturing roller 32 in which induction coils 16, . . . , 16 are incorporated in a structure similar to that shown in FIG. As a result, both edges 22.2 of the coil plate material 11 are formed from the initial stage of forming.
This means that the temperature difference between the two neighboring parts and the other parts 26 can be kept high.

In the above embodiment, the induction coil 16 is used as an example of the heating temperature control element, but the invention is not limited to this, and an infrared heater or the like may be used. In addition, as an example of a temperature control element for cooling,
Although the case where the nozzle 24 is used is given as an example, it is not necessarily necessary to spray the cooling medium to both ends 22, 22 of the coil plate material 11, and it is not necessary to spray the cooling medium to both ends 22, 22 of the coil plate material 11. Both ends 22.2 of the coil plate material 11
It is also possible to cool two areas.

(Effects of the Invention) The roller for manufacturing welded pipes of the present invention rolls on the surface of the coil plate material and is equipped with a temperature control element for heating or cooling the plate material. The coil plate material can be formed by rolling on the surface, and at the same time, the coil plate material can be heated or cooled by the temperature control element. Therefore, it can be effectively used as a heating device or a cooling device to prevent the occurrence of buckling wrinkles in the coil plate material. The coil plate material can be made compact and the coil plate material can be heated or cooled without any problem even when the distance between the roll stands is narrow.

[Brief explanation of drawings]

Figures 1 to 8 show one embodiment of the present invention.
The figure is a front view of the welded pipe manufacturing rollers arranged in the fin bath zone, Figures 2 to 4 are enlarged sectional views of the main parts of the welded pipe manufacturing rollers in Figure 1, and Figure 5 is the coil plate material. A diagram showing the optimal temperature distribution during heating and cooling,
FIG. 6 is a front view showing a modified example of the welded pipe manufacturing roller, FIGS. 7 and 8 are front views of the welded pipe manufacturing roller arranged in the forming zone, and FIGS. 9 to 11 are FIG. 3 is an explanatory diagram of a conventional welded pipe manufacturing method. 11...Coil plate material, 12.13.14.15.27
．． 32... Roller for welded pipe manufacturing, 16... Induction coil, 24... Cooling nozzle. Patent Applicant Kawasaki Heavy Industries Co., Ltd. Agent Masahiro Nishimori・：、゛）i□・、１１；：・・・；HL! MIH knee fifth factor diagram Figure 7/b

Claims (1)

[Claims] 1. A roller for manufacturing welded pipes, characterized in that it rolls on the surface of a coil plate material and is equipped with a temperature control element for heating or cooling the plate material.