JPH01104418A - Device for cooling forming roll for cold working - Google Patents

Abstract

PURPOSE:To constrain a temp. rise by cooling a forming roll with good efficiency and to improve the durability by fixing a metal made heat radiating member having a good heat transfer to the side face of the forming roll for cold working and the part not impeding the rotation thereof. CONSTITUTION:The metal plate 1 of the part to be formed is rounded at the section by right and left forming rolls 3, a thin forming roll 6 is made in a pipe shape as well by abutting it from the upper part and the mutual abutted both end edges are welded to obtain a seam welded pipe. A recessed part 12 is formed on both side faces of the forming roll 6 for cold working. The annular base plate 15 composed of the metal having good heat transfer of an aluminum, copper, etc., is fixed by a bolt 13, nut 14 inside this recessed part 12 and moreover on the outside face of the annular base plate 15 a lot of vertical wall like heat radiating fins 11 are integrally formed. If necessary a yoked type hollow box is further arranged so as to stride over this forming roll 6 and a cooling air is injected from numerous blowholes at its inner face. The excess temp. rise of the forming roll 6,by a welding heat, etc., is thus prevented.

Description

Detailed Description of the Invention 89 Purpose of the Invention (Industrial Application Field) The cooling device for forming rolls for cold working according to the present invention is applicable to cold working devices for manufacturing electric resistance welded pipes and various other articles. This is intended to prevent the temperature of the molding roll that is assembled and presses the outer peripheral surface of the molded object from rising excessively due to the heat of the molded object heated by a welding machine, a bending machine, etc.

(Prior art) For example, when manufacturing an electric resistance welded pipe, a long metal plate is passed between multiple sets of forming rolls to gradually round its cross section, and both ends are butted against each other. The finished edges are welded together to complete the ERW tube.

The forming wool used to roll up the metal plate when making such an electric resistance welded pipe is constructed as shown in FIG. 4, for example.

The forming roll shown in Fig. 4 is installed at the welding part of the electric resistance welding tube production line, and in order to roll the metal plate 1 into a circular cross section, the forming roll is rotated by a pair of threads each rotating around an axis 2.2. forming rolls 3.3, and forming rolls 6.3, which rotate around shafts 4.4 and hold down the abutment portion 5 between the two edges of the metal sheet 1 that has come off from the pair of forming rolls 3.3. It consists of 6.

The cross section is gradually rounded by forming rolls (not shown) provided at the front stage of the ERW pipe production line, and by passing between the four forming rolls 3.6, the cross section becomes a closed circular shape. The resulting metal plate 1 is made into an electric resistance welded tube by high-frequency or TIG welding at the seams of the abutting portions 5.

(Problems to be Solved by the Invention) However, in the forming roll for cold working constructed and used as described above, the following disadvantages have arisen in the prior art.

That is, the metal plate 1 whose outer circumferential surface is pressed by each forming roll 3.6 is heated during welding by the work coil or contact tip of the welding machine provided at the forming roll 3.6 portion, and the temperature rises. In addition, if a bending machine or the like is installed immediately after the welding machine, the bending machine will also heat the material, causing the temperature to rise.

In this way, the metal plate 1 is processed during the processing process following roll forming.
When the temperature rises, it is unavoidable that this heat is transmitted to the forming rolls 3.6, and the temperature of each forming roll 3J6 increases.

When the temperature of each forming roll 3.6 increases significantly, the surface of each forming roll 3.6, which is required to have increased hardness and improved wear resistance, is annealed, and the ``forming roll 3.6''
durability will deteriorate.

For this reason, conventional practice has been to pour cooling water or oil onto the outer surface of each forming roll 3.6 to prevent the temperature of each forming roll 3.6 from rising excessively. When performing so-called gas seal welding, which involves covering the welded area with an inert gas such as nitrogen or argon, in order to obtain high-quality ERW pipes,
It is not possible to pour cooling liquid into the forming roll 3.6 close to the weld.

In the case of the forming roll 3.3 that holds down the metal plate 1 from the left and right sides, since it is relatively large, a cooling liquid flow path is provided inside the forming roll 3.3 to cool the forming roll 3.3 from inside. However, in the case of the forming roll 6.6 that presses down the butt portion 5 of the metal plate 1, it is thinner than the forming roll 3.3, and it is difficult to provide a cooling liquid flow path inside. be.

For this reason, from the nozzle provided near the forming roll 6.6,
It is possible to cool the forming roll 6.6 by blowing air (cold air) toward the forming roll 6.6, but simply blowing air would have poor cooling efficiency.
The forming roll cannot be sufficiently cooled. The forming roll cooling device for cold working of the present invention eliminates all of the above-mentioned disadvantages.

b0 Configuration of the invention (means for solving the problem) The cooling device for a cold working forming roll of the present invention cools a rotating forming roll for cold working with its outer circumferential surface abutting against a molded product. It is something.

Such a cooling device of the present invention is constructed by fixing a metal heat radiating member with good heat conductivity on the side surface of the forming roll in a portion that does not interfere with the rotation of the forming roll.・Furthermore, if necessary, a bifurcated hollow box is installed in a part that does not interfere with the rotation of the forming roll, so as to straddle a part of the forming roll, so that cooling air can be freely supplied to the inside. Fixed.

On the inner surface of the bifurcated part of this hollow box, a large number of blowholes are formed in the part facing the side surface of the forming roll, and from these blowholes,
Cooling air is blown onto the sides of the forming rolls to be conveyed.

(Function) In the forming roll cooling device for cold working of the present invention configured as described above, the forming roll is constantly radiated heat by the action of the heat radiating member fixed to the side surface, and is not heated excessively. Temperature rise is prevented.

In addition, when cooling air is forcibly fed, the cooling air is continuously fed into the hollow box while the production line provided with forming rolls is in operation.

The cooling air sent into the hollow box is blown out from the numerous blowholes formed on the inner surface of the bifurcated part of the hollow box toward the part of the side of the forming roll where the heat dissipation member is fixed, and the forming roll Cool efficiently.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

FIG. 1 is a partially vertical cross-sectional front view showing an embodiment of the cooling device for cold working forming rolls of the present invention, and FIG.
It is an arrow view.

Recesses 1 are provided on both sides of the forming roll 6 to be cooled.
2.12 are formed, and an annular substrate 15.15 made of a metal with good heat conductivity, such as aluminum or copper, is fixed in each recess 12.12 with bolts 13 and nuts 14. . Upright wall-shaped radiation fins 11.11 are integrally formed on the outer surface of each annular substrate 15.15.

In this way, heat dissipation fins 1 are placed on the side of the forming roll 6 to be cooled.
Since the annular substrate 15.15 having a diameter of 1.11 is embedded and fixed, the contact area between the forming roll 6 and the cooling air is increased, and the cooling efficiency of the forming roll 6 is improved.

Furthermore, heat dissipation fins 11 are fixedly installed on the side surface of the forming roll 6.
Cooling air is forcibly sent to the forming roll 6.
In order to further improve the cooling efficiency, as shown in FIG. 1, a hollow box 7 for blowing cooling air is provided so as to straddle the forming roll 6.6 to be cooled.

That is, in order to press the abutting portion 5 of the metal plate 1 from above, which is pressed from the left and right by a pair of forming rolls 3.3 rotating about the shaft 2.2, A bifurcated hollow box 7 is provided in the upper half of the forming roll 6.6 which is rotatably provided so as not to hinder the rotation of each forming roll 6.6.

The hollow box 7 is provided so that the bifurcated portion 8 straddles the upper half of each forming roll 6.
．． 9 to freely supply cooling air to the inside of each hollow box 7.7.

Further, a large number of blowholes 10.10 are formed on the inner surface of the forked portion 8.8 provided at the bottom of each hollow box 7, at the portion facing the side surface of the forming roll 6.6. Forming rolls 6.6 to be cooled from a number of blowholes 1゛0.10
Cooling air is blown onto the sides of the machine.

When the forming roll 6.6 is cooled by the forming roll cooling device for cold working of the present invention configured as described above, during the operation of a production line for electric resistance welded pipes etc., which is provided with the forming roll 6'%6, Cooling air continues to be fed into each hollow box 7.7 using a hose or the like connected at one end to the air intake port 9.9. This cooling air is low-temperature and has been cooled in advance by an evaporator of a refrigerator or the like, if necessary.

The cooling air sent into each hollow box 7.7 in this way is delivered to the forming roll 6 from a large number of blowholes 10.10 formed on the inner surface of the bifurcated portion 8.8 of this hollow box 7.7. The forming roll 6.6 is cooled by blowing out toward the heat dissipating fins 11.11 (see FIGS. 1 and 2) fixed to the side surface of the forming roll 6.6.

The cooling air blown onto the side surface of the forming roll 6.6 from the numerous blowholes 10.10
radiating fins 11.11 and annular substrate 1 fixed on the side surface of
By colliding with 5.15, a boundary layer with poor heat conductivity is prevented from developing on the surfaces of the heat dissipation fins 11.11 and the annular substrate 15.15, and the forming roll 6. 6 is efficiently cooled.

The air that has cooled the forming roll 6.6 is transferred to the forming roll 6.
．． 6 and the inner surface of the bifurcated part 8.8.

In the illustrated embodiment, the hollow boxes are shaped to support the shafts 4.4 of the forming rolls 6.6, but the hollow boxes are not necessarily supported by the shafts 4.4. 4, the shaft 4.4 can be supported by another member and the hollow box 7.7
can also be simply formed into a cover shape.

C0 Effects of the Invention The cooling device for cold working forming rolls of the present invention is configured and operates as described above, so that the forming rolls are efficiently cooled and the temperature rise of the cold working forming rolls is minimized. This makes it possible to improve the durability of the forming roll.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a forming roll provided with radiation fins, which is the cooling device of the present invention, Fig. 2 is a view taken in the direction of arrow A in Fig. 1, and Fig. 3 is a view showing how cooling air is forcibly blown. FIG. 4 is a front view showing an example of a forming roll to which the cooling device of the present invention is attached. 1: Metal plate, 2: Shaft, 3: Forming roll, 4: Shaft, 5: Butt part, 6: Forming roll, Fu: Hollow box, 8: Forked part, 9: Inlet, 10: Fumarole, 11: Heat radiation fin, 12
: recess, 13: port, 14: nut, 15: annular substrate.

Claims (2)

[Claims] (1) A cooling device for cooling a forming roll for cold working, which rotates with its outer circumferential surface abutting against a to-be-molded product, in which a side surface of the forming roll is provided with a portion that does not interfere with the rotation of the forming roll. A cooling device for forming rolls for cold working, consisting of a fixed metal heat dissipation member with good heat conductivity. (2) A cooling device for cooling a forming roll for cold working, which rotates with its outer circumferential surface abutting against a to-be-molded product, and includes a cooling device on a side surface of the forming roll that does not interfere with the rotation of the forming roll. In addition to fixing metal heat dissipation fins with good heat conductivity, the fins are arranged so as to straddle a part of the forming roll so as not to impede the rotation of the forming roll, so that cooling air can be freely supplied to the inside of the forming roll. A forming roll for cold working consisting of a fixed bifurcated hollow box, and a large number of blowholes formed on the inner surface of the bifurcated part of the hollow box, facing the side surface of the forming roll to which a heat dissipation member is fixed. cooling system.