JPH0794051B2 - Method for manufacturing porous extrusion mold material and manufacturing die - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous extrusion mold material, and more particularly to a method for manufacturing a porous extrusion mold material having a plurality of hollow portions inside and outside, and a manufacturing die used therefor.

Conventional technology and problems Among metal extruded materials such as aluminum, the extruded mold material having a plurality of hollow portions is generally extruded using a porthole type die that is a combination of male and female dies. .

However, there is a limit to the size and arrangement of the hollow portions that can be molded by the ordinary porthole die. For example, it is possible to manufacture a so-called harmonica type porous extruded material in which a large number of square hollow parts are arranged side by side in a row. Even if the hollow parts are quite small, as shown in FIG. It was impossible to manufacture a porous hollow mold material in which a small hollow part having a side of about 5 mm is arranged in a plurality of rows vertically and horizontally to form a three-dimensional shape.

Therefore, an object of the present invention is to provide a unique technical means capable of producing a porous extruded material having a complicated cross-sectional shape in which the small hollow portions are arranged vertically and horizontally without any trouble. To do.

MEANS FOR SOLVING THE PROBLEMS The present invention divides a porous extruded mold material into an outer portion thereof and an inner partition body portion which partitions the inside thereof to form a large number of hollow portions, each of which is a parent-child type combination die. The main feature of the present invention is that the co-extrusion molding is individually carried out by the method described above, and then they are joined immediately after the extrusion to be united and integrated.

That is, a first aspect of the present invention is an extrusion molding of a port-hole type first die for molding an outer body of a porous extrusion molding material, and an inner partition body forming a plurality of hollow portions by forming partition walls in the outer body. Immediately after the partition body extruded by the second die is combined with the second die and the partition body extruded from the tip of the male mandrel portion of the first die is removed from the first die at a stage where it does not lose surface activity. The gist of the present invention is to provide a method for manufacturing a porous extrusion mold material, which comprises press-contacting an inner peripheral surface of an extruded outer shell while causing a shrinking behavior in a centripetal direction so as to be fused and integrated.

A second invention is a port-hole type first die for molding an outer body of a hollow extruded material, and a second die for forming an internal partition body of a hollow extruded material which is installed and embedded in a male die thereof. And a relief space portion is formed in the male die of the first die for leading out the internal partition body extruded from the second die from the front end surface of the mandrel portion of the male die, while the first die is A die for manufacturing a porous extrusion die material, characterized in that the extrusion port is inclined in the centripetal direction and is capable of being extruded while causing the outer shell to shrink toward the partition body. And

EXAMPLES Hereinafter, the present invention will be described based on illustrated examples.

Porous extrusion mold material to be produced by the present invention (1)
For example, as shown in FIG. 6, a large number of small hollow portions (2) are provided in a plurality of rows and columns in the vertical and horizontal directions, and are used for applications such as a multi-flow type refrigerant flow pipe for a heat exchanger. It is what is done.

FIG. 1 shows the structure of a die used for producing the porous extrusion mold material (1). This die has a form which should also be referred to as a parent-child die in which a smaller second die (B) is further assembled in the first die (A).

The first die (A) is for extruding an outer shell (1A) [see FIG. 7 (a)] that constitutes the outer peripheral wall of the extrusion die material (1), and the second die (B) is for extruding An inner partition body (1B) [see FIG. 7 (b)] having a required cross-sectional shape is formed by partitioning the outer shell body (1A) into a plurality of hollow portions (2).

The first die (A) is a porthole type which is a combination of a female die (11) and a male die (12) as shown in FIG. 2 and FIG. The formed annular extrusion port (13) is inclined at a predetermined angle in the centripetal direction. That is, with respect to the axis of the die, the extrusion port (13) is inclined inward toward the extrusion direction, and the annular extruded material forming the outer shell is deformed in a direction in which the cross section is reduced immediately after extrusion. It is said that it can be extruded while causing a shrinking behavior. The angle of inclination (θ) of the extrusion port (13) is set in the range of about 5 to 45 °, and is generally set in the range of about 15 ± 5 °.

On the other hand, the second die (B) is also constructed as a porthole type which is a combination of a female die (21) and a male die (22) as shown in FIGS. 4 and 5. Is.
The second die has a plurality of vertical partition walls (3) and a plurality of horizontal partition walls (4) as shown in FIG. The inner partition body (1B) having a lattice-shaped cross section having a plurality of hollow portions (2) is manufactured by extrusion molding. In the drawing, the mandrel portion (22a) of the male die (22) is shown as a single projecting portion in a simplified manner for the sake of clarity. However, in reality, the sectional shape of the internal partition body (1B) having the above-mentioned shape is shown. The corresponding extrusion port (23) is formed between the bearing portions of the male and female molds (21, 22).

The second die (B) is fitted into a recess (14) formed in the central portion of the base portion of the male die (12) of the first die (A) as shown in FIG. Equipped to the state. Then, the extruded material extruded by the second die (B), that is, the internal partition body (1B) can be led out forward from the central portion of the tip end surface through the mandrel portion (12a) of the male die (12). As described above, in the male mold (12), a tapered relief space portion (15) is provided, one end of which is opened in the recess (14) and the other end of which is opened in the tip surface of the mandrel portion (12a). There is.

In the figure, (16) and (24) are the first and second dies (A).
It is a molding material inlet provided in the male molds (12) and (22) of (B).

The porous extrusion mold material (1) is extruded using the above-mentioned combination die as follows.

The molding material of the aluminum billet heated in the container (not shown) of the extruder flows into the inlets (16) (24) of the first and second dies (A) and (B) separately by the extrusion pressure. . Then, the inner partition body (1B) as shown in FIG. 7B is first extruded by the second die (B). The molded internal partition (1B) is led out forward from the tip end surface of the mandrel (12a) through the relief space (15) in the male die (12) of the first die (A). To be done. On the other hand, at the same time, in the first die (A), the inclined extrusion port (13) extrudes the hollow body corresponding to the outer shell (1A) shown in FIG. 7 (B). According to the inclination of the extrusion port (13), the resin is extruded in a centripetal direction while causing a contraction behavior. Therefore, immediately after extrusion, the internal partition body (1
The outer peripheral portion of B) is brought into contact with the outer peripheral portion thereof to prevent the shrinking behavior, and is molded into an outer shell (1A) having a predetermined sectional shape. However, at this stage, the inner partition (1B) and the outer shell (1A)
Since all of them are still in a state of sufficient surface activation immediately after extrusion, mutual contact portions are welded and integrated, and small hollow portions (2) in multiple stages and multiple rows as shown in FIG. 6 are formed.
To be extruded material (1).

In the above embodiment, the second die (B) is a porthole type, and the internal partition (1B) itself has its own hollow portion (2). (B) may use a flat die. That is,
As shown in FIG. 9B, a flat die is used which can form an internal partition body (1B ') having one horizontal partition wall (4') and a large number of vertical partition walls (3) orthogonal thereto. It is assumed that the outer body (1A ') formed by the first die (A) is welded and integrated to the outer side of the inner partition body (1B') by this, as shown in FIG. A porous extruded material (1 ') having a large number of small hollow portions (2) may be obtained.

EFFECTS OF THE INVENTION According to the present invention, as described above, the first and second dies are combined with each other, and the outer portion of the porous extruded die member and the inner partition body portion inside thereof are separately provided. After being extruded with each of the above dies, the two are automatically merged and welded together to produce the required porous hollow mold material, which is relatively impossible to achieve with conventional porthole dies. It is possible to easily manufacture a porous extrusion mold material having a complicated cross-sectional shape having a large number of small hollow portions without any trouble.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical cross-sectional view of the entire combination die, FIG. 2 is a vertical cross-sectional view of the first die portion, and FIG. 3 is a front view thereof. FIG. 4 is a longitudinal sectional view of the second die portion, FIG. 5 is a front view thereof, FIG. 6 is a transverse sectional view showing an example of the porous extrusion molding material to be produced, and FIG. 7 shows (a) and (b) as Each cross-sectional view showing the shape of the extruded material portion extruded by the first die and the second die, FIG. 8 is a cross-sectional view showing another example of the porous extrusion mold material, and FIG. 9 (a).
(B) is a transverse cross-sectional view of each part of the outer shell and the inner partition. (A) …… First die, (B) …… Second die, (1)
(1 ') ... Porous extrusion mold material, (1A) ... Outer shell, (1B)
…… Internal partition, (2) …… Hollow part, (11) (21) ……
Female type, (12) (22) male type, (12a) ... Mandrel part,
(13) …… Extrusion port, (15) …… Relief space, (23)
…… Extrusion port.

Claims (2)

[Claims] 1. A port-hole type first die for molding an outer shell of a porous extruded mold material, and a second die for extruding an inner partition member that constitutes a partition wall in the outer shell member to form a large number of hollow portions. Immediately after the partition body extruded by the second die in combination with the die is drawn out from the tip of the mandrel portion of the male die of the first die, at the stage where it still loses the surface activity,
A method for producing a porous extruded mold material, which comprises press-contacting an inner peripheral surface of an outer shell extruded while causing a shrinking behavior in a centripetal direction from a die to integrate them by welding. 2. A port-hole type first die for molding an outer body of a hollow extruded material, and a second die for forming an internal partition body of the hollow extruded material which is mounted and installed in a male mold thereof. And a relief space portion is formed in the male die of the first die for leading the internal partition body extruded from the second die forward from the tip surface of the mandrel portion of the male die, while the first die is A die for manufacturing a porous extrusion die material, wherein an extrusion port is inclined in a centripetal direction so that an outer body can be extruded while causing a shrinking behavior toward the partition body.