JP2516646B2 - Cooling device for forming roll for cold working - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) A cooling device for a cold-working forming roll according to the present invention is
Built-in cold working equipment for manufacturing electric resistance welded pipes and other various articles, the molding roll for molding that presses the outer peripheral surface of the molded product is heated by a welding machine, bending machine, etc. It is intended to prevent an excessive temperature rise due to heat.

(Prior Art) For example, in the case of manufacturing an electric resistance welded pipe, a long metal plate is passed between a plurality of sets of forming rolls to gradually round its cross section, and both edges thereof are butted against each other. The edges are welded together to complete the ERW pipe.
A forming roll for rolling a metal plate when making such an electric resistance welded pipe is configured, for example, as shown in FIG.

The forming roll shown in FIG. 4 is provided at the welded portion of the electric resistance welded pipe manufacturing line. Since the metal plate 1 is rounded into a circular cross section, the left and right sides 1 and 2 are rotated about axes 2 and 2, respectively.
A pair of forming rolls 3 and 3, and a forming roll 6 that rotates around the shafts 4 and 4 respectively and that suppresses a portion 5 of the metal plate 1 that is abutted against each other and that deviates from the pair of forming rolls 3 and 3. , 6 and.

The section is gradually rounded by a forming roll (not shown) provided in the preceding stage of the electric resistance welded pipe manufacturing line.
The metal plate 1 having a circular shape whose cross section is closed by passing between the individual molding rolls 3 and 6 is subjected to high frequency or TIG welding at the seam of the above-mentioned mating portion 5 to form an electric resistance welded pipe.

(Problems to be Solved by the Invention) However, in the cold-working molding roll configured and used as described above, the following disadvantages have conventionally occurred.

That is, the metal plate 1 whose outer peripheral surface is suppressed by the forming rolls 3 and 6 is heated and temperature rises when it is welded by the work coil or the contact tip of the welding machine provided in the forming rolls 3 and 6. . Not only that,
When a bending machine or the like is provided immediately after the welding machine, the bending machine also heats and the temperature rises.

In this way, if the temperature of the metal plate 1 rises in the working process following the roll forming, it is unavoidable that this heat is transmitted to the forming rolls 3 and 6, and the temperature of each forming roll 3 and 6 rises. .

When the temperature rise of each forming roll 3, 6 becomes remarkable, the surface of each forming roll 3, 6 which is required to have a high hardness and improved wear resistance is annealed. Durability will deteriorate.

Therefore, conventionally, by pouring cooling water or oil onto the outer surfaces of the forming rolls 3 and 6, the temperature of each forming roll 3 and 6 is prevented from rising excessively. However, in order to obtain a high quality electric resistance welded pipe, when the so-called gas seal welding or the like in which the periphery of the welded portion is covered with an inert gas such as nitrogen or argon, the forming rolls 3 and 6 close to the welded portion are cooled. I can't pour liquid for use.

In addition, the forming rolls 3 and 3 that hold down the metal plate 1 from the left and right
In this case, since it is relatively large in size, a cooling liquid flow path is provided inside and the molding rolls 3 are cooled from the inside. On the other hand, in the case of the forming rolls 6 and 6 that hold down the butting portion 5 of the metal plate 1, it is thinner than the forming rolls 3 and 3, and it is difficult to provide a cooling liquid flow path inside. Is.

Therefore, it is possible to cool the forming rolls 6 and 6 by attaching air (cool air) toward the forming rolls 6 and 6 from a nozzle provided in the vicinity of the forming rolls 6 and 6. However, if air is blown to the ends, the cooling efficiency is poor and the forming roll cannot be cooled sufficiently.

The cooling device for a cold-working forming roll according to the present invention eliminates any of the above inconveniences.

(Means for Solving the Problem) The cooling device for a cold-working forming roll according to the present invention cools a cold-working forming roll that is rotated by abutting the outer peripheral surface thereof against a molded product. Such a cooling device for a cold working forming roll of the present invention, on the side surface of the forming roll,
A metal radiating fin with good heat conductivity is fixed to the part of the forming roll that does not prevent rotation. With this,
A bifurcated hollow box capable of supplying cooling air is fixed to the inside of the forming roll so as to straddle a part of the forming roll so as not to prevent rotation. Further, a large number of fumaroles are formed on the inner surface of the bifurcated portion of the hollow box at a portion facing the side surface of the forming roll on which the heat radiation fins are fixed.

(Operation) In the case of the cooling roll forming cooling apparatus of the present invention configured as described above, the cooling air is continuously fed into the hollow box during the operation of the production line provided with the forming roll.

The cooling air sent into the hollow box is ejected from a large number of fumaroles formed on the inner surface of the bifurcated portion of the hollow box toward the portion where the heat radiation fins are fixed on the side surface of the forming roll, To cool efficiently.

(Embodiment) FIGS. 1 to 3 show an embodiment of the present invention. Recesses 12 and 12 are formed on both side surfaces of the forming roll 6 to be cooled, and the recesses 12 and 12 are provided with annular substrates 15 and 15 made of a metal having good electrothermal property such as aluminum and copper. ,bolt
It is fixed by 13 and nut 14. On the outer side surface of each of the annular rings 15, 15, radiating fins 11, 11 in the form of standing walls are integrally formed.

Radiating fins are provided on the side surface of the forming roll 6 to be cooled in this way.
Since the annular substrates 15 and 15 having 11 and 11 are fixed so as to be embedded, the contact area between the forming roll 6 and the cooling air is widened, and the cooling efficiency of the forming roll 6 is improved.

Further, in the case of the cold roll forming roll cooling device of the present invention, in order to further improve the cooling efficiency of the forming roll 6, the radiating fins 11 fixed to the side surface of the forming roll 6,
The cooling air is forcibly sent to 11. For this reason, as shown in FIG. 3, hollow boxes 7 and 7 for blowing cooling air are provided so as to straddle the forming rolls 6 and 6 to be cooled.

That is, in order to suppress the butting portion 5 of the metal plate 1 which is the product to be molded, which is pressed from the left and right by the pair of forming rolls 3 and 3 which rotate about the shafts 2 and 2, respectively, the shafts are respectively pressed. The bisection hollow boxes 7 and 7 are provided so as not to hinder the rotation of the molding rolls 6 and 6 and the respective molding rolls 6 and 6 which are rotatably provided around 4 and 4. There is.

Air inlets 9 and 9 are provided on the upper side surfaces of the hollow boxes 7 and 7, which are provided so as to straddle the upper half of the forming rolls 6 and 6 at the bifurcated portion 8, and Cooling air can be supplied internally.

Further, a large number of fumaroles 10 and 10 are formed in the inner surfaces of the forked portions 8 and 8 provided in the lower portions of the hollow boxes 7 and 7, respectively, at the portions facing the side surfaces of the forming rolls 6 and 6, respectively. And
The cooling air is blown onto the side surfaces of the forming rolls 6, 6 to be cooled, from the large number of air holes 10, 10.

When the forming rolls 6, 6 are cooled by the cooling device for forming rolls for cold working of the present invention configured as described above,
During operation of the production line for electric resistance welded pipes, etc., in which the molding rolls 6 and 6 are provided, by a hose having one end connected to the air supply port 9
Cooling air is continuously fed into each hollow box 7, 7.
This cooling air has a low temperature that has been cooled in advance by an evaporator of a refrigerator or the like, if necessary.

The cooling air thus sent into the hollow boxes 7, 7 is formed from the large number of blow holes 10, 10 formed on the inner surfaces of the bifurcated parts 8, 8 of the hollow boxes 7, 7 to the forming rolls 6, The radiating fins 11 and 11 (see FIGS. 1 and 2) fixed to the side surface of 6 are jetted to cool the forming rolls 6 and 6.

The cooling air blown from the large number of fumaroles 10, 10 to the side surfaces of the forming rolls 6, 6 collides with the radiation fins 11, 11 fixed to the side surfaces of the forming rolls 6, 6 and the annular substrates 15, 15. The heat dissipation fins 11 and 11 and the annular substrates 15 and 15
Boundary layer having poor heat transfer property is prevented from developing on the surface of, and the forming rolls 6, 6 having the radiation fins 11, 11 fixed thereto are cooled efficiently.

The air that has cooled the forming rolls 6, 6 is discharged from the gaps existing between the side surfaces of the forming rolls 6, 6 and the inner surfaces of the forked portions 8, 8.

In the illustrated embodiment, the hollow boxes 7 and 7 are shaped so as to support the shafts 4 and 4 of the forming rolls 6 and 6, but the hollow boxes 7 and 7 do not necessarily have to be the shafts 4 and 4. It is not necessary to support the shafts 4 and 4, and the shafts 4 and 4 are supported by other members.
Can also be formed simply as a cover.

(Effect of the Invention) Since the cooling device for a cold-working forming roll of the present invention is configured and operates as described above, the cooling of the forming roll is efficiently performed to increase the temperature of the cold-working forming roll. It can be minimized to improve the durability of this forming roll.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a sectional view of a forming roll provided with heat radiation fins, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is for cooling. FIG. 4 is a front view of a partial vertical section showing a structure for forcibly blowing air, and FIG. 4 is a front view showing an example of a forming roll to which the cooling device of the present invention should be attached. 1: Metal plate, 2: Shaft, 3: Forming roll, 4: Shaft, 5: Joining part, 6: Forming roll, 7: Hollow box, 8: Bifurcated part, 9: Air supply port, 1
0: fumarole, 11: radiating fin, 12: recess, 13: bolt, 14: nut, 15: annular substrate.

Claims (1)

(57) [Claims] 1. An outer peripheral surface is struck against a molded product to rotate.
A cooling device for cooling a forming roll for cold working,
In a portion of the side of the forming roll that does not prevent the rotation of the forming roll, while firmly fixing a metal radiation fin having good heat conductivity, in a portion of the forming roll that does not prevent the rotation of the forming roll, Fix a bifurcated hollow box that can freely supply cooling air inside, straddling a part of it.
A cooling device for a cold-working forming roll, comprising a large number of fumaroles formed on the inner surface of the bifurcated portion of the hollow box, the portion facing the side surface of the forming roll having the heat radiation fins fixed thereto.