JPH07110369B2 - Method of manufacturing product having corrugated thin portion on at least one side of thick portion - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a product having a corrugated thin portion on at least one side of a thick portion, such as a building material and a radiation fin for a heat exchanger.

Conventional technology and problems For example, building materials and products such as heat radiating fins for heat exchangers and the like must of course be functionally superior,
Furthermore, in order to improve the added value, it is required to be rich in decorativeness so as to give an aesthetic impression to consumers and users.

From such a viewpoint, the present invention provides a method capable of producing a product having a corrugated thin wall portion on at least one side of a thick wall portion, which is excellent in functionality and decorativeness, in a good shape and with high productivity. The purpose is to provide.

Means for Solving the Problems In the above object, the present invention is a method for producing a product having a corrugated thin portion on at least one side of the thick portion, wherein the thick portion forming hole is adjacent to the thick portion. And a molding hole having a thin-wall molding hole communicated with each other is provided,
The extrusion thickness in the thin-wall forming hole is regulated to 1/2 or less of the extrusion thickness in the thick-wall forming hole, and the speed of the extruded material passing through the thin-wall forming hole is thick. Between the bearing lengths of the thin-wall forming hole and the thick-wall forming hole so that the speed is in the range of more than 1 time and less than 2 times the speed of the extruded material passing through the hole forming hole. The production of a product having a corrugated thin portion on at least one side of a thick portion, which is characterized in that an extrusion die having a relationship defined in The method is the gist.

The speed of the extruded material passing through the hole for forming the thin portion is set to a speed in the range of more than 1 time and 2 times or less than the speed of the extruded material passing through the hole for forming the thick portion. This is to form an appropriate corrugated thin portion in the portion. If it is 1 time or less, no wave is generated in the thin portion, and if it exceeds 2 times, defects such as cracks are likely to occur in the product.

Further, the extrusion thickness in the thin portion forming hole is regulated to 1/2 or less of the extrusion thickness in the thick portion forming hole in order to form a corrugation only in the thin portion. so,
If this is larger than 1/2, the influence of waves formed in the thin portion of the extruded material may reach the thick portion.

Action In the above-mentioned manufacturing method, during extrusion, the extruded material passing through the thin portion forming hole and the extruded material passing through the thick portion forming hole are extruded in a state of being connected, for thin portion forming The extruded material passing through the hole is extruded relatively faster than the extruded material passing through the thick portion forming hole, and the extrusion thickness and the thick portion forming hole in the thin portion forming hole Since the above-mentioned difference is provided between the thin-walled portion and the extruded thickness of the thin-walled portion, the thin-walled portion is sufficiently restrained by the thick-walled portion to be formed into a beautiful wavy shape. It is not affected by waves and is molded into a beautiful thick part without waves. Therefore, a product having a corrugated thin portion on at least one side of the thick portion is manufactured in a good shape.

Moreover, since it suffices that the extrusion material is passed through the molding holes of the extrusion die having the above-mentioned configuration and the extrusion process is performed, a product having a corrugated thin portion on at least one side of the thick portion is manufactured with high productivity. .

Examples Examples will be described below.

In this embodiment, a product (7) made of metal such as Al having corrugated thin portions (7b) and (7b) on both sides of a thick portion (1a) having a rectangular cross section is to be manufactured.

For manufacturing this product (7), the solid die for extrusion (1) shown in FIGS. 1 to 3 is used. In this die (1), (2) is a plate-shaped die body, and an extrusion hole (3) penetrating the die body (2) in the front-rear direction is provided in the shaft core portion thereof. In this extrusion hole (3), (4) is an extrusion material inflow portion, (5) is a molding hole, and (6) is a relief portion.

As shown in FIG. 1, the molding hole (5) has a rectangular thick-walled molding hole (5a) and left and right sides 1 that are connected to both sides of the hole (5a) adjacent to each other. Pair of thin part forming holes (5b)
(5b) consists of

The extruded thickness t of the thin portion forming hole (5b) is restricted to 1/2 or less of the extruded thickness T of the thick portion forming hole (5a).

Further, the relationship between the bearing lengths a and A of the thin portion forming hole (5b) and the thick portion forming hole (5a) is such that the extrusion passing through the thin portion forming hole (5b) The speed of the material is set to be in the range of more than 1 time and less than 2 times the speed of the extruded material passing through the thick portion forming hole (5a).

Generally, when the bearing lengths a and A of both molding holes (5a) and (5b) are equal, the extruded material passing through the thick part molding hole (5a) has a smaller thickness molding hole (5b). ) Will be extruded faster than the extruded material passing through. Then, in order to equalize the speed of the extruded material passing through the molding holes (5a) (5b), the bearing length a of the thin wall molding hole (5b) is shortened and the thick wall molding hole is reduced. It is necessary to form the bearing length A of the portion (5a) longer than that. Incidentally, in the confirmation experiment described later, in order to equalize the speed of the extruded material passing through each molding hole (5a) (5b), the bearing length a of the thin-wall molding hole (5b) was 1.5 mm, It was necessary to give a considerable difference such that the bearing length A of the thick portion forming hole (5a) was 6.0 mm. Therefore, in the die (1) of the present invention, since the thin portion of the extruded material is formed in a wavy shape, the difference between the bearing lengths a and A exceeds the above-mentioned difference. A larger difference will be given.

The bearing lengths a and A are determined based on, for example, empirically obtained data.

When extrusion is performed using a metal billet such as Al using the solid die (1) having the above-mentioned configuration, as shown in FIG. 4, three-dimensionally is formed on both sides of the thick section (7a) of rectangular cross section. A product (7) having wavy thin portions (7b) (7b) with a changed shape is manufactured.

By the way, extrusion was performed by changing the ratio of the speed of the extruded material passing through the thin portion forming hole (5b) to the speed of the extruded material passing through the thick portion forming hole (5a). When the extruded material thus obtained was examined, the results shown in Table 1 were obtained. The dies (1) used were 3 mm in extrusion thickness T and 35 m in width B for the thick-walled portion forming hole (5a).
m, the extrusion thickness t of the thin portion forming hole (5b) is 1 mm,
The width b was set to 10 mm, and the billet used was A6063 alloy. The velocity ratio in the table is evaluated by the unit length of the thick wall portion (7a) divided by the wave length at the tip of the thin wall portion (7b) in the length range.

From the results shown in the table, the relationship between the bearing lengths a and A of the thin-wall forming hole (5b) and the thick-wall forming hole (5a) is shown as follows. ), The speed of the extruded material passing through) is determined to be in the range of more than 1 time and less than 2 times the speed of the extruded material passing through the thick portion forming hole (5a), It was confirmed that a product (7) having an appropriate wavy thin portion (7b) without generation could be obtained. In the product (7) obtained, the thin portion (7b) is formed into a beautiful wavy shape, and the thick portion (7a) is formed.
Was molded into a beautiful thick part that was not affected by waves.

EFFECTS OF THE INVENTION As described above, according to the present invention, the method for producing a product having the corrugated thin portion on at least one side of the thick portion is communicated with the thick portion forming hole portion and adjacent to the hole portion. A molding hole having a thin portion molding hole portion is provided, and the extrusion thickness in the thin portion molding hole portion is regulated to 1/2 or less of the extrusion thickness in the thick portion molding hole portion, and For forming a thin-walled portion such that the speed of the extruded material passing through the thin-walled portion forming hole is in the range of more than 1 time and less than twice the speed of the extruded material passing through the thick portion forming hole. By using an extrusion die in which the relationship between the bearing lengths of the hole portion and the thick-walled portion forming hole portion is defined, the extrusion processing is performed by passing the extrusion material through the forming hole of the extrusion die. During extrusion, an extrusion material that passes through the thin-wall forming hole and an extrusion material that passes through the thick-wall forming hole Is extruded in a continuous state, the extruded material passing through the thin-wall forming hole is relatively faster than the extruded material passing through the thick-wall forming hole, and Since the above-described difference is provided between the extruded thickness in the thin portion forming hole and the extruded thickness in the thick portion forming hole, the thin portion is sufficiently restrained by the thick portion. A product that is formed into a beautiful wavy shape, and the thick part is formed into a clean thick part that is not affected by the waves of the thin part and has no waves, and thus has a wavy thin part on at least one side of the thick part. Can be manufactured in a good shape.

Moreover, since it suffices to perform the extrusion process by passing the extrusion material through the forming hole of the extrusion die having the above-mentioned configuration, it is possible to manufacture a product having a corrugated thin portion on at least one side of the thick portion with high productivity You can

Therefore, according to the method of the present invention, it is possible to manufacture a building material, a fin material such as a heat exchanger, or the like having excellent functionality and decorativeness with high productivity.

[Brief description of drawings]

1 to 3 show an example of a die used in the method of the present invention. FIG. 1 is an end view on the outlet side thereof, FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is a perspective view seen from the entrance side. FIG. 4 is a perspective view of a product to be manufactured. (1) ... Die, (5) ... Forming hole, (5a) ... Thick part forming hole, (5b) ... Thin part forming hole, (7)
…… Product, (7a) …… Thick part, (7b) …… Wavy thin part.

Claims (1)

[Claims] 1. A method of manufacturing a product having a corrugated thin portion on at least one side of a thick portion, wherein the thick portion forming hole portion and the thin portion forming hole that is communicated adjacent to the hole portion. And a molding hole having a
The extrusion thickness in the thin-wall forming hole is regulated to 1/2 or less of the extrusion thickness in the thick-wall forming hole, and the speed of the extruded material passing through the thin-wall forming hole is thick. Between the bearing lengths of the thin-wall forming hole and the thick-wall forming hole so that the speed is in the range of more than 1 time and less than 2 times the speed of the extruded material passing through the hole forming hole. The production of a product having a corrugated thin wall portion on at least one side of a thick wall portion, characterized in that an extrusion die having a predetermined relationship is used, and an extrusion material is passed through a molding hole of the extrusion die to perform extrusion processing. Method.