JPH10263604A - Method for forming finned plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for easily forming a finned plate the height of the fine of which is sufficient without costing and by which increase of the size of a rolling device is evaded. SOLUTION: Because a lot of fine grooves 13 which are parallel to the rotary shaft of a work roll are made on either or both of two rolling rolls 16, 20 comprising work rolls 6, at the time of rolling, by making a base stock 2 enter these fine grooves 13, the deformation (elongation) of a material in the rolling direction is suppressed and the elongation in thinner parts 36 in the longitudinal directiod is restrained. Because tensile force to fin parts 32 from the thinner parts 36 is also eliminated, elongation is not generated in the fin parts 32 and the deformation (upheaval) of the material to the groove parts 12 for forming the fin parts 32 is increased. Consequently, the fin parts 32 of the finned plate 30 are matched to the shape of the groove parts 12 of the work roll 16 and the sufficient height of the fin is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a finned plate, and more particularly to a method for forming a finned plate used as a material for a heat sink or a heat transfer tube of a heat exchanger.

[0002]

2. Description of the Related Art A finned plate provided with fins and grooves at predetermined intervals on the surface of the plate is an integrated circuit (IC).
cuit) and heat transistors for power transistors, etc., or formed on pipes with finned surfaces inside or outside, and seam welded them to produce heat transfer tubes for heat exchange. Its demand is expanding in various fields.

[0003] As a method of forming fins on the surface of a plate material,
There are various methods such as extrusion, drawing, pressing, cutting, and rolling, but when the thickness of the finned plate is small, rolling is common in terms of processing efficiency and the degree of freedom of the fin shape. It has become.

When a finned plate material is processed by rolling, a work roll having a groove in a portion where a fin is to be formed is used, and the material is rolled in a portion other than the groove portion of the roll to reduce the plate thickness. A general method is to form fins in the grooves.

FIGS. 8 to 11 show an example of a rolled state and a rolled material when a finned plate is formed by a conventional method.

FIG. 8 shows a case where a finned plate having fins parallel to the longitudinal direction of a rolled material is formed. In FIG. 8, a work roll 1 for forming a finned plate includes a grooved rolling roll 10 composed of a plurality of flat portions 11 and a plurality of grooves 12 provided between the plurality of flat portions 11.
And a non-grooved roll 20. A non-grooved roll 20 is provided at a position facing the grooved roll 10 at a predetermined rolling interval. The cross section of the groove 12 is V-shaped.

The grooved rolling roll 10 of the work roll 1
The material 2 is inserted between the grooved non-rolling roll 20 and the grooved rolling roll 10 and the grooved non-rolling roll 20 while being rotated in the longitudinal direction of the material 2, and the inserted material 2 is rolled. A finned plate having a plurality of fins corresponding to No. 12 can be formed.

FIG. 9 shows the finned plate 3 formed by the method of FIG. This finned plate 3
A plurality of fins 32 corresponding to a plurality of grooves 12 of the grooved roll 10 and a plurality of flat portions 1 of the grooved roll 10.
1 and a plurality of thin portions 31 corresponding to 1. Therefore, the finned plate 3 as shown in FIG. 9 is formed by the above-described forming method of FIG.

FIG. 10 shows a case where a finned plate having fins having a predetermined angle with respect to the longitudinal direction of the rolled material is formed. In FIG. 10, a work roll 5 forming a finned plate includes a grooved rolling roll 15 including a plurality of flat portions 11 and a plurality of grooves 12 provided between the plurality of flat portions 11, and a grooveless rolling roll. 20. The grooved roll 15 has a groove 12 formed in a spiral shape such as a screw groove in order to form a fin having a predetermined angle with respect to the longitudinal direction of the rolled material. Therefore, the grooved roll 1 provided in the same manner as in FIG.
The finned plate 4 having a predetermined angle with respect to the longitudinal direction of the rolled material as shown in FIG. 11 is formed by the method 5 and the non-grooved roll 20 in the same manner as described above.

[0010]

However, in the conventional method for forming a finned plate, the material 2 is rolled on the flat portion 11 other than the groove portion 12 for forming the fin. Material deformation (elongation) of the part 31 occurs in the rolling direction, and the elongation of the thin part 31 causes the fin part 32 to be pulled in the longitudinal direction. The tensile force causes the fin portion 32 to elongate, and the elongation reduces the thickness of the fin portion 32, making it difficult to form a fin having a sufficient height. Such a phenomenon occurs because the thin portion 31 is thinner than the width of the fin portion 32 in the width direction of the plate material.
The larger the width is, the more noticeable.

FIG. 12 is an enlarged cross-sectional view of the groove portion 12 and the fin portion 32 formed by the conventional rolling process. As can be seen from this figure, the fin tip 33
A gap is created between the groove 12 and the apex 12a of the groove 12.

Further, as a method of forming the fin portion to have a sufficiently large height, there is a method in which a material having a large thickness is used, the pressing force is increased, and the fin portion is rolled at a high pressure to secure the height of the fin portion. However, in this case, the rolling device becomes large, and the rolling device is costly.

Accordingly, an object of the present invention is to provide a method for forming a finned plate having a sufficient fin height easily without increasing the size of the rolling mill and without increasing the cost.

[0014]

In order to achieve the above object, the present invention provides a method for forming a finned plate having a plurality of fins formed in parallel with a longitudinal direction. And a first rolling roll having a plurality of flat portions formed between a plurality of grooves and having a plurality of fine grooves formed on a surface thereof in parallel with the rotation axis, and facing the first rolling roll. A second rolling roll is arranged so as to form a rolling interval, and a plate material is supplied at the rolling interval to form a plurality of fins corresponding to a plurality of grooves on the plate material while suppressing elongation of the plate material by a large number of fine grooves. And a method for forming a finned plate.

According to another aspect of the present invention, there is provided a method of forming a finned plate having a plurality of fins formed in parallel with a longitudinal direction, the method comprising a plurality of grooves corresponding to the plurality of fins. A first rolling roll is disposed, and a second rolling roll having a large number of fine grooves formed on its surface in parallel with the rotation axis is disposed so as to form a rolling interval in opposition to the first rolling roll. A method for forming a finned plate, comprising: forming a plurality of fins corresponding to a plurality of grooves on a plate while suppressing the elongation of the plate by a number of fine grooves while supplying the plate at rolling intervals.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an example of a rolled state and a rolled material when a finned plate is formed by the method of the present invention.

FIG. 1 shows a case where a finned plate having fins parallel to the longitudinal direction of a rolled material is formed. In FIG. 1, a work roll 6 forming a finned plate includes a plurality of flat portions 11 having a plurality of fine grooves 13 on a surface thereof in parallel with a rotation axis, and a plurality of groove portions provided between the plurality of flat portions 11. And a non-grooved rolling roll 20 having a micro-groove 13 comprising the groove 12. A non-grooved roll 20 is provided at a predetermined rolling interval at a position facing the grooved roll 16 having the fine grooves 13. The cross section of the groove 12 is V-shaped.

The raw material 2 is placed between the grooved rolling roll 16 having the fine grooves 13 of the work roll 6 and the non-grooved rolling roll 20.
And rolling the inserted material 2 while rotating the grooved rolling roll 16 having the fine grooves 13 and the grooveless rolling roll 20 in the longitudinal direction of the material 2. Thereby, a plurality of fins corresponding to the plurality of groove portions 12 and a plurality of thin portions which are rolled in the flat portion 12 and have fine grooves 34 formed by the material 2 at the time of rolling entering the many fine grooves 13. 36 can be formed.

FIG. 2 shows a finned plate 30 having fine grooves 34 formed by the method of FIG. The finned plate 30 corresponds to a plurality of fins 32 corresponding to the plurality of grooves 12 of the grooved roll 16 and a plurality of flat portions 11 having a large number of fine grooves 13 on the surface of the grooved roll 16. It is constituted by a plurality of thin portions 36 having fine grooves 34. Therefore, the finned plate 30 having a large number of fine grooves 34 on the surface of the thin portion 36 as shown in FIG. 2 is formed by the above-described forming method of FIG.

FIG. 3 shows a case where a finned plate having fins having a predetermined angle with respect to the longitudinal direction of the rolled material is formed. In FIG. 3, a work roll 7 forming a finned plate includes a plurality of flat portions 11 having a plurality of fine grooves 13 on the surface thereof in parallel with the rotation axis, and a plurality of groove portions provided between the plurality of flat portions 11. A grooved rolling roll 17 having fine grooves 13 composed of
0. The grooved rolling roll 17 having the fine grooves 13 has a groove portion 12 formed in a spiral shape such as a screw groove in order to form fins having a predetermined angle with respect to the longitudinal direction of the rolled material. I have.

Therefore, the fine grooves 1 provided in the same manner as in FIG.
A plurality of fin portions 32 having a predetermined angle with respect to the longitudinal direction of the rolled material as shown in FIG. A finned plate 35 composed of a plurality of thin portions 36 having a large number of fine grooves 34 is formed.

As described above, the grooved rolling rolls 16 and 17
By providing a large number of fine grooves 13 on the surface of the flat portion 11 in parallel with the rotation axes of the grooved rolling rolls 16 and 17, the material 2 enters the fine grooves 13 during the rolling process, whereby the rolling direction is increased. Material deformation (elongation) is suppressed, and the elongation of the thin portion 36 in the longitudinal direction is restrained. As a result, the tensile force from the thin portion 36 to the fin portion 32 is also eliminated, so that the fin portion 32 does not elongate, and the material deformation (raised) of the groove 12 for forming the fin portion 32 increases.

As a result, as shown in FIG.
2 is in accordance with the shape of the groove 12 of the work rolls 6 and 7, and a sufficient fin height can be obtained.

FIGS. 6 and 7 show another modification of the present invention. FIG. 6 shows a micro-grooved rolling roll 21 having a large number of micro-grooves parallel to its rotation axis on the surface of a rolling roll having no grooves forming fins, and a plurality of flat portions 11.
The material 2 is rolled by a work roll 8 comprising a grooved rolling roll 10 having a plurality of grooves 12 provided between the plurality of flat portions 11 to form a finned plate. .

Thus, a finned plate having a plurality of fine grooves on the surface (lower surface) where no fin is formed can be obtained.

FIG. 7 shows a fine groove comprising a plurality of flat portions 11 having a plurality of fine grooves 13 on the surface thereof in parallel with the rotation axis, and a plurality of groove portions 12 provided between the plurality of flat portions 11. 13 and a micro-grooved rolling roll 21 having a large number of micro-grooves in parallel with its rotation axis on the surface of the non-grooved rolling roll forming a fin portion opposed thereto. The raw material 2 is rolled by the work roll 9 to form a finned plate.

Thus, a finned plate having a plurality of fine grooves on the surface of the thin portion of the surface where the fins are formed and the surface (lower surface) where the fins are not formed can be obtained.

The finned plate obtained by the work rolls shown in FIGS. 6 and 7 can obtain the same effect as the finned plate obtained in FIGS. 1 and 3.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific examples in comparison with the prior art.

A work roll 1 shown in FIG. 8 is used as an example of the prior art, and a work roll 6 shown in FIG. 1 is used as an example of the present invention. Each groove 12 has a base of 0.15
It has a V-shape having a triangular cross section having a height of 0.3 mm and a height of 0.3 mm, and the interval between the grooves 12 (width of the flat portion 11) is 0.6 mm. The fine groove 13 in FIG. 1 was a groove having a depth of 5 μm, and an annealed material of phosphorus deoxidized copper having a thickness of 0.6 mm and a width of 25 mm was rolled so that the thin portion had a thickness of 0.25 mm. .

As a result, the finned plate 3 obtained by rolling with the work roll 1 shown in FIG. 8 has a rounded shape at the tip 33 of the fin 32 as shown in FIG. The maximum was 0.22 mm.

On the other hand, in the finned plate 30 obtained by rolling with the work roll 6 shown in FIG. 1, the fin portion 32 conforms to the shape of the groove 12 as shown in FIG. 32 had a maximum height of 0.29 mm.

[0033]

As described above, according to the method for forming a finned plate of the present invention, a large number of fine grooves are formed in one or both of two rolling rolls constituting a work roll in parallel with the rotation axis thereof. Since the material enters the fine grooves during rolling, the material deformation (elongation) in the rolling direction is suppressed, and the elongation of the thin portion in the longitudinal direction is restrained. Because there is no pulling force from the thin part to the part, the fin part does not elongate,
The material deformation (raised) in the groove for forming the fin increases. As a result, the fin portion of the finned plate follows the shape of the groove portion of the work roll, and a sufficient fin height can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing that a finned plate having fins parallel to a longitudinal direction of a rolled material is formed according to the present invention.

FIG. 2 is a view showing a finned plate having fine grooves formed by the method of FIG. 1;

FIG. 3 is a view showing that a finned plate having fins having a predetermined angle with respect to the longitudinal direction of a rolled material is formed according to the present invention.

FIG. 4 is a view showing a finned plate having fine grooves formed by the method of FIG. 3;

FIG. 5 is an enlarged cross-sectional view of a groove during rolling according to the present invention and a fin formed by the groove.

FIG. 6 is a view showing that a finned plate having fins parallel to a longitudinal direction of a rolled material is formed according to the present invention.

FIG. 7 is a view showing that a finned plate having fins parallel to a longitudinal direction of a rolled material is formed according to the present invention.

FIG. 8 is a view showing that a finned plate having fins parallel to a longitudinal direction of a rolled material is formed by a conventional technique.

FIG. 9 is a diagram showing a finned plate formed by the method of FIG. 8;

FIG. 10 is a view showing that a finned plate having fins having a predetermined angle with respect to a longitudinal direction of a rolled material is formed by a conventional technique.

FIG. 11 is a view showing a finned plate formed by the method of FIG. 10;

FIG. 12 is an enlarged cross-sectional view of a groove at the time of rolling according to the conventional technique and a fin formed by the groove.

[Explanation of symbols]

 1, 5, 6, 7, 8, 9 Work roll 2 Material 3, 4, 30, 35 Plate with fins 10, 15, 16, 17 Rolling roll with groove 11 Flat portion 12 Groove portion 12a Vertex 13, 34 Fine groove 21 Fine Roll with groove 31, 36 Thin part 32 Fin part 33 Fin tip

Continued on the front page (51) Int.Cl. ⁶ Identification code FI F28F 1/40 F28F 1/40 E

Claims (3)

[Claims] 1. A method of forming a finned plate having a plurality of fins formed in parallel with a longitudinal direction, the method comprising: forming a plurality of grooves corresponding to the plurality of fins; A first rolling roll having a plurality of flat portions having a large number of fine grooves formed in parallel with the rotation axis is disposed, and a second rolling roll is formed so as to form a rolling interval in opposition to the first rolling roll. Roll rolls are arranged, and the plurality of fins corresponding to the plurality of grooves are formed on the plate while supplying the plate at the rolling interval and suppressing the elongation of the plate by the plurality of fine grooves. A method for forming a finned plate. 2. The second rolling roll has a large number of fine grooves parallel to a rotation axis on a surface thereof, and the plurality of fins reduce the elongation of the plate material by the large number of grooves of the second rolling roll. 2. The method for forming a finned plate according to claim 1, wherein the finned plate is formed while being suppressed by the fine grooves. 3. A method of forming a finned plate having a plurality of fins formed in parallel with a longitudinal direction, wherein a first rolling roll having a plurality of grooves corresponding to the plurality of fins is disposed on a surface thereof. The second in which a number of fine grooves are formed in parallel with the rotation axis
The rolling roll is arranged so as to form a rolling interval in opposition to the first rolling roll, and the plate material is supplied at the rolling interval to suppress the elongation of the plate material by the plurality of fine grooves. A method for forming a finned plate, wherein the plurality of fins corresponding to a plurality of grooves are formed on the plate material.