JP3126217B2 - Manufacturing method of extruded secondary product having narrow space - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an extruded secondary product suitable for producing a member having a narrow space, for example, a radiator plate or a harmonica tube.

[0002]

2. Description of the Related Art For example, as a heat sink for various electronic circuits,
An aluminum radiator plate (53) in which a number of fins (52) are provided in parallel at a predetermined interval on a flat plate portion (51) as shown in FIG. 3 is widely used. Such a radiator plate (53) is manufactured by extruding an aluminum material, and for example, a die (54) as shown in FIG. 4 is used as an extrusion die. That is, a plurality of forming protrusions (56) having a narrow cross section projecting from the extrusion opening (55) of the die (54) main body form a thin fin (52) between adjacent forming protrusions (56). A fin forming space (57) and a remaining flat plate forming space (58) are formed.

In such a radiator plate (53), the larger the surface area of the fin (52) is, the better the heat radiation efficiency is. There is a need for a heat sink having a large ratio.

[0004]

However, in order to form a high fin (52) in the die (54), it is necessary to increase the length of the projection (55) projecting into the extrusion opening (56). However, if the length is increased, the strength of the molded projections (56) is reduced, and the molded projections (56) cannot withstand the pressing force applied at the time of the extrusion processing. The heat sink (5)
There is a problem in that the thickness of the fin (52) of 3) is increased or decreased. Due to this problem, there is a limit in the production of a heat sink having a high tongue ratio and good heat dissipation efficiency.

In the manufacture of a harmonica tube (61) having a shape as shown in FIG. 5, a molding projection of an extrusion die corresponding to a hollow space (62) is formed by the space (62). If the shape of the heat sink is elongated, the heat sink (5
Similar to the fin (52) of 3), a problem such as breakage or bending occurs during extrusion. Therefore, there is a limit in manufacturing a member having a cross-sectional shape having a narrow hollow space portion such as a harmonica tube by extrusion.

An object of the present invention is to provide a method of manufacturing a secondary extruded product capable of reliably manufacturing various members having a narrow space portion with a view to solving such a problem.

[0007]

According to the present invention, there is provided a method of manufacturing an extruded secondary processed product having a narrow space portion, in order to achieve the above-mentioned object, a space corresponding to a die forming convex portion in a cross section. With two or more parts (15, 17)
In addition, these space portions (15, 17) are divided into partition portions (13).
The extruded material (1) which is provided in a row through (19) and is extruded by making these space portions (15, 17) wide.
1a, 16a) and the extruded material (11a, 16a)
And the space portion (15, 17) compresses in the direction of reducing the width of the series vital the space portion (15, 17), partition section
(13) The entire shape is deformed without deforming (19)
It is characterized by the following.

[0008]

The space portions (15, 17) of the extruded material (11a, 16a), which is a primary processed product, pass through the partition portions (13, 19).
And two or more spaces are provided in a row.
7) The width of the final processed secondary product (11b, 16b)
Are formed wider than the width of the space portion (15 ', 17'). Therefore, the width of the molding protrusion of the extrusion die corresponding to the space (15, 17) is equal to the space (15 ', 17') of the final processed secondary product (11b, 16b).
Is larger than the width, the mechanical strength is high, and even if a large pressing force is applied to the extrusion die during extrusion molding, the molded projections are unlikely to break or bend. Then, such an extruded material (11a, 16a) is supplied to the space (15, 1).
7) Compression in the direction in which the width of the series is reduced ,
The entire shape can be changed without deforming the parts (13) and (19).
By shaping , an extruded secondary processed product (11b, 16b) having a narrow space portion of the target shape is obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of the method for producing a secondary extrusion product having a narrow space according to the present invention will be described with reference to the drawings.

In each of the following examples, a 6000 series aluminum alloy was used as the material metal, and each extruded material was obtained by known extrusion means, and each product in the final shape was obtained by known compression processing means. Was. (Example 1) First , six fins as shown in FIG.
Five spaces (15) between (13) and each fin (13)
An extruded material (11a) having the following formula was prepared. This extruded material (1
1a) is a V-shaped portion for facilitating the compressive deformation of the flat plate portion (12) at the gaps of the fins (13) protruding portions of the flat plate portion (12) and the positions opposed to the respective gaps in the cross-sectional shape.
A letter-shaped notch (14) is formed. In addition,
(13) corresponds to the partition in the present invention, and five (5)
The space portions (15) are provided in rows through fins (13).
Have been.

Next , as shown by the arrow, the flat plate portion (12) of the extruded material (11a) is compressed from both sides, and the flat plate portion (12) is deformed so as to crush the notch (14). Thus, a final shape heat sink (11b) having high fins (13) as shown in FIG. 1B was manufactured. In such a heat sink (11b), each space (15 ') between the fins (13) adjacent to each other is narrower than the space (15) of the extruded material (11a) by compression. In other words, the width of the molding projection corresponding to the space (15) in the cross section of the extrusion die is wider than the space (15 ') of the final shape heat sink (11b). Therefore, even if a large pressing force is applied to the forming protrusion of the extrusion die during the formation of the extruded material (11a), breakage or bending of the forming protrusion is extremely unlikely to occur. Also,
The fin (13) is deformed by the compression deformation.
Not. Example 2 First, an extruded material (16) as shown in FIG.
a) was prepared. This extruded material (16a) has a cross-sectional shape in which three unit hexagons (18) each having a hollow space (17) are connected. Also, the adjacent unit hexagon
(18) The common wall (19) between (18) is the partition of the present invention.
And the three space portions (17) are connected via a common wall (19).
And are provided in a row.

Next, as shown by arrows, both ends of the extruded material (16a) are compressed, and the unit hexagon (1) is compressed.
The bending angle at the top of 8) is changed to an acute angle, and FIG.
A harmonica tube (16b) having a narrow space portion (17 ′) as shown in FIG. In the harmonica tube (16b) having such a final shape, the width of the space (17 ') is smaller than the width of the space (17) of the extruded material (16a) by compression. In other words, the width of the molding projection corresponding to the space (17) in the cross section of the extrusion die is wider than the space (17 ') of the final shape harmonica tube (16b).
Therefore, even if a large pressing force is applied to the forming protrusion of the extrusion die during the formation of the extruded material (16a), breakage or bending of the forming protrusion is extremely unlikely to occur. In addition, the compression deformation
Thus, the common wall (19) is not deformed at all.

In this embodiment, a harmonica tube having a polygonal cross section was manufactured, but a harmonica tube (61) having an elliptical cross section as shown in FIG.
Also, if the cross-sectional shape of the extruded material is circular, it can be easily manufactured by the same method.

[0014]

In the present invention, the compression process followed extruding one width of the space in the product of the cross-sectional shape
It is narrower than the width of the space portion definitive to the next workpiece. By such a two-stage processing, the width of the molding protrusion of the extrusion die corresponding to the space of the extruded material is made wider than the width of the space of the final shape product to increase the mechanical strength of the die. Therefore, even if a large pressing force is applied to the extrusion die during extrusion molding, problems such as breakage and bending of the molded projections can be avoided. As a result, a narrow space , such as a heat sink or a harmonica tube, is separated by two through the partition.
Various members provided in a row or more can be reliably manufactured, which contributes to an improvement in productivity of these members.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of an extruded material, and FIG. 1B is a cross-sectional view of a heat sink obtained by compression working in Example 1 of the present invention.

FIG. 2A is a cross-sectional view of an extruded material, and FIG. 2B is a cross-sectional view of a harmonica tube obtained by compression working in Example 2 of the present invention.

FIG. 3 is a sectional view of a conventional heat sink.

FIG. 4 is a cross-sectional view of an extrusion die for manufacturing the heat sink of FIG. 3;

FIG. 5 is a sectional view of a conventional harmonica tube.

[Explanation of symbols]

 11a, 16a: Extruded material 15, 17: Space 13: Partition (fin) 19: Partition (shared wall)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21C 23/14

Claims (1)

(57) [Claims] 1. A cross-section having two or more space portions (15, 17) corresponding to molding protrusions of a die.
Space portions (15, 17) through the partition portions (13) (19)
In a row , and these space portions (15, 1
Extruded material (11a, 16) obtained by extruding 7) as a wide material
with a), the extruded material (11a, 16a), the air
The spaces (15, 17) are connected in series and the space (15, 1
7) Compressing in the direction in which the width is reduced , the partition portion (13)
A method of manufacturing an extruded secondary product having a narrow space portion, wherein the overall shape is deformed without deforming (19) .