JPH024369B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to peripheral walls such as those used in architectural structural materials such as window sashes and industrial machine parts such as cylinder barrel materials of rodless cylinders. This invention relates to a method for producing a semi-hollow metal extrusion material such as a semi-hollow type or a channel type having a small slit-like opening along its length in a part thereof, particularly a semi-hollow aluminum extrusion material, and the structure of a die used therein. It is something.

BACKGROUND ART Conventionally, the so-called semi-hollow metal extrusion material described above has been manufactured by extrusion molding using a porthole die. That is, the porthole die is a combination of a female die and a male die, and a part of the annular molding gap formed between the bearing parts of both dies is projected into the bearing part of the male die. The provided small protrusions form a slit-shaped opening in a part of the peripheral wall of the hollow molded material which is formed in accordance with the above-mentioned forming process.

Problems to be Solved by the Invention However, when manufacturing so-called semi-hollow extruded materials using a porthole die consisting of a combination of male and female dies as described above, the male die forms as the metal material is extruded under high pressure. easily causing deflection;
Or, due to the fact that the small protrusion of the male mold that should form the opening in the extruded material is easily bent or deformed, repeated use may cause the small protrusion to come into close contact with the inner surface of the female mold. There may be a slight delay. For this reason, the extruded material gets into the gap, creating thin protruding scratches called burrs on the side edges of the opening of the extruded material, which not only deteriorates molding accuracy but also There were some drawbacks such as the need for finishing work to remove the burrs mentioned above.

In addition, the porthole die described above, which has a small protrusion that partially closes the molding gap, requires a high degree of processing precision, especially since the small protrusion must be able to come into close contact with the female mold. Not only is it difficult to manufacture, but it is also difficult to change the opening dimensions of the extruded material to be molded.
Coupled with the fact that separate male dies are required for each die, the manufacturing cost of the die is also high, leading to problems such as an increase in the cost of the product.

It is an object of the present invention to solve the above-mentioned problems and to make it possible to produce high-precision, high-quality semi-hollow extruded materials with high efficiency using a die with a simple configuration.

Means for Solving the Problems For the above purpose, the present invention provides female and male porthole dies, as well as a third component.
A special die consisting of three parts is used to extrude a metal material, and a bridge piece for forming a slit-like opening in an extruded material is removably assembled. This is the main idea.

That is, when extruding a semi-hollow metal extruded material having a slit-shaped opening along the length direction in a part of the peripheral wall, the present invention provides a method for forming a semi-hollow metal extruded material between the female and male bearing parts of the porthole die. By performing an extrusion operation with the middle part of the removable bridge piece disposed astride the male and female molds positioned in a part of the annular molding gap, A method for manufacturing a semi-hollow metal extrusion material characterized by forming a slit-like opening, and a die used therein comprising a female porthole die and a male porthole die, and a porthole die formed between the male and female bearing parts. a bridge piece disposed astride between the male and female molds in such a manner as to close a part of the annular molding gap, and the bridge piece is formed by carving the mounting portions at both ends facing the male and female molds. The gist of the present invention is a die for manufacturing a semi-hollow metal extrusion material, which is characterized in that it is removably assembled by being fitted into a mounting groove.

Embodiments Hereinafter, the present invention will be explained based on illustrated embodiments.

The die A shown in FIGS. 1 to 3 is used to manufacture a semi-hollow extruded material X having a rectangular cross section and having a narrow slit-like opening b in a part of the peripheral wall a as shown in FIG. belongs to.

As shown in FIG. 1, the die A is composed of three parts: a female porthole die 1, a male die 2, and a bridge piece 3.

The female mold 1 has a protruding edge 5 for positioning on the periphery of the joint surface 4, a recess 6 into which the molding material flows is formed in the center of the joint surface 4, and a penetrating shape in the center of the recess 6. A molded opening 7 is bored in the hole.

On the other hand, the male mold 2 has a molding protrusion 9 facing into the molding opening 7 and forming an annular molding gap 8 between the bearing parts, and the molding material is placed at a position around the protrusion 9. A plurality of introduction holes 10 are drilled through the extrusion direction in the extrusion direction.
As shown in FIG. 2, a positioning step 12 provided on the periphery of the joint surface 11 is fitted into the edge 5, and combined with the female mold 1.

As shown in FIG. 1, the bridge piece 3 is a plate-like piece with a rectangular cross section.
As shown in the figure, the mounting portion 3a at one end is formed at the side end of the side protruding edge 9a created by cutting a recess 13 into the peripheral surface of the distal end of the molded convex portion 9. The female mold 1 and the male mold 2 are fitted into the bottom mounting groove 9b, and the mounting portion 3b at the other end is fitted into the bottomed mounting groove 1b formed at the opposing position of the female mold 1. It is removably attached so that it straddles the mold, and the middle part is between the molding parts.
8 and partially closed off.

The dimensions of the opening b of the extruded material X are determined according to the thickness D of the bridge piece 3. The thickness D can be set to a minimum of about 1 mm. Further, the length L and width W of the bridge piece 3 are set at 2 times the thickness D, respectively, in order to maintain strength.
It is necessary to have at least twice as much. As for the material, it is preferable to use the same material as the molds 1 and 2, but it is also possible to use materials superior in strength, such as high-speed mesh, ceramic, or cemented carbide.

In the die A, a metal forming material such as an aluminum billet heated in the extruder container flows into the introduction hole 10 of the male mold 2. The molding material that has flowed into the introduction hole 10 passes through the recess 6 of the female mold 1, merges here, and is extruded from the molding gap 8 around the molding protrusion 9 of the male mold 2.
In the meantime, a part of the bridge piece 3 is closed, so as shown in FIG. It is molded into a semi-hollow extruded material X.

FIGS. 5 and 6 show other embodiments, which are used to manufacture extruded materials X with different sizes of openings b.

The male mold 2 and female mold 1 constituting this die B are completely the same as those in the above embodiment, and only the bridge piece 30 is different.

The bridge piece 30 has a substantially cross-shaped cross section, and has mounting parts 30a and 30b corresponding to the embodiment described above, as shown in FIG. protrusions 30c, 30d
are provided in a lateral protruding shape, and these protrusions fit tightly into the molding gap 8 to partially close it. By fitting the mounting portions 30a and 30b into the bottomed mounting grooves 9b and 1b of the male mold 2 and female mold 1, respectively, the mounting portions 30a and 30b are removably mounted across both molds 1 and 2. ing.

Therefore, in the case of this embodiment, both the projections 3
It is possible to manufacture an extruded material X' having a slit-like opening b having a width corresponding to the dimension D' of both ends of 0c and 30d.

As is already clear from the above two embodiments, according to the application of the present invention, even when manufacturing different types of semi-hollow extruded materials X, X' with different dimensions of the opening b, a common male mold can be used. 2 and female mold 1,
Bridge piece 3 with different thickness D or dimension D' as mentioned above
This can be done simply by replacing it with 0. Therefore, it is easy to manufacture the mold, and it is possible to reduce the manufacturing cost and, in turn, the product price.

Effects of the Invention As described above, when extruding a semi-hollow metal extruded material having a slit-like opening along the length direction in a part of the peripheral wall, the female and male porthole dies are used. By performing an extrusion operation with the middle part of the removable bridge piece disposed astride the male and female molds positioned in a part of the annular molding space formed between the bearing parts, Since the slit-like opening is formed with the bridge piece, extrusion can be carried out with the bridge piece always being present in a transverse state during molding, and as a result, the bridge piece can be formed in the extrusion mold material. It is possible to accurately form a slit-shaped opening corresponding to the thickness of the film.
Therefore, as in the conventional case, a gap is created between the small protrusion of the male mold and the female mold, which should form the opening.
It is possible to avoid the occurrence of burrs on both sides of the opening of the extruded material, and to efficiently produce high-precision semi-hollow extruded materials while eliminating the need for burr removal work.

Furthermore, as mentioned above, the bridge piece is constructed separately from the male and female molds and is removably fitted into these, so it can be easily replaced. By appropriately replacing only the bridge piece according to the number of times it is used, it is possible to extend the life of the die as a whole, and eliminate the need for precise machining of the die part to form openings in the extruded material. Therefore, the production of the die can be facilitated, and the production cost of the die can be reduced.

Furthermore, the thickness of the bridge piece is set appropriately,
By replacing this, the dimensions of the opening of the extruded mold material or the shape of the extruded mold material itself can be arbitrarily changed and set without changing the male and female molds, and it is very convenient. It is also possible to make the above dimensions much smaller than when manufacturing using a conventional porthole die.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a partially cutaway perspective view showing the constituent members of the die separated, and FIG. 2 is a main part of the die. FIG. 3 is a cross-sectional view along the line of FIG. 2, and FIG. 4 is a cross-sectional view of a semi-hollow extruded material produced by the die shown in FIGS. 1 to 3. 5 and 6 show other embodiments, FIG. 5 is a perspective view of the bridge piece, and FIG. 6 is a perspective view of the bridge piece.
FIG. 3 is a cross-sectional view of the die corresponding to the figure. 1...Female type, 1b...Mounting groove, 2...Male type,
3, 30...bridge piece, 3a, 30a, 3b,
30b...Mounting part, 30c, 30d...Protrusion part,
8... Between molding〓, 9b... Mounting groove.

Claims (1)

[Claims] 1. When extruding a semi-hollow metal extruded material having a slit-shaped opening along its length in a part of the peripheral wall, a gap between the female and male bearing parts of the porthole die is By performing an extrusion operation with the middle part of the removable bridge piece disposed astride the male and female molds positioned in a part of the annular molding gap to be formed, the bridge piece is A method for producing a semi-hollow metal extrusion material, comprising forming the slit-like opening. 2. A female porthole die, a male and female porthole die, and a bridge piece disposed across the male and female dies in such a manner as to partially close the annular molding gap formed between the bearing parts of the male and female dies. The bridge piece is detachably assembled by fitting the mounting portions at both ends into mounting grooves formed oppositely on the male and female molds. Dies for manufacturing. 3. For manufacturing a semi-hollow metal extrusion mold material according to claim 2, wherein the bridge piece is a plate-like piece with a rectangular cross section, and the width direction thereof is arranged parallel to the axial direction of the male and female molds. dice. 4. The semi-hollow metal extrusion molded material according to claim 2, wherein the bridge piece has a pair of protrusions of a predetermined height on both sides of the intermediate portion thereof, which are tightly fitted into the molding space. Dies for manufacturing.