JP2528156B2 - Die for extruding profile with fins - Google Patents

Description

TECHNICAL FIELD The present invention relates to a die for extruding a profile with fins, and more specifically, it relates to a hollow blade for extruding a profile with fins.

(Prior Art) A finned profile formed by extruding aluminum is composed of a thin portion (fin) and a thick portion (a base portion for branching and projecting a large number of fins), and an electronic device as a radiator of the electronic component. Is used for.

If the plate thickness of the fin portion becomes thin and the tongue portion becomes narrow in order to enhance the heat radiation effect, the risk of bending and breaking of the tongue portion of the die increases. In order to avoid this, in the solid dies, the dies were made thicker or a metal flow groove was provided in front of the bearing part of the dies. It has been proposed to form the reinforcing portion of the tongue portion on the billet inlet side of the bearing surface of the tongue portion.

Further, it is also known to manufacture a fin-shaped shaped material using a holly daw, and in Japanese Patent Publication No. 59-1488, the length and shape of the mandrel portion formed on the port body is determined by the fin formed on the die base body. We propose to improve the die strength by controlling the metal flow rate by changing the shape according to the shape of the shaping hole.

(Problems to be Solved by the Invention) In the solid die 20 (FIG. 7), since the tongue portion 5 has a cantilever structure, when the fin 4 becomes thin or long,
There is a risk of bending or breaking the tongue portion 5. In order to avoid this, for example, it is possible to provide a reinforcing portion for the tongue portion as in Japanese Patent Publication No. 59-33444, but the structure of the entire die becomes complicated.

On the other hand, in the hollow rice as proposed in Japanese Examined Patent Publication No. 59-1488, since the forming hole of the fin-shaped profile is formed in the die base, the tongue portion also has a cantilever structure, and the fin portion If the plate thickness is thin and the length is large, the tongue portion may be bent or broken.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the die for extruding a profile with fins of the present invention is such that a male die having a tongue portion integrally formed at the tip is inserted into a female die. A port hole extending in the axial direction of the mold is communicated with the tongue portion and the thick portion molding hole.

Then, the entire outer periphery of the male die may be inserted and fixed in the die ring, and port holes of any number and position may be formed in the main body portion of the male die, but there is a gap between the die ring and the male die. Is preferably formed as a port hole. In addition to such a port hole, 1 formed along the male central axis
It is preferable to use more than one port hole. It is desirable that the width of the port hole formed in such a male die be substantially equal to the width of the entire fin portion of the finned profile.

Further, by bringing the tip of the male die into contact with the female die, the male die and the female die are fixed, and the metal flows from the port hole into the gap formed by opening a part of the other,
It is desirable to form the molding hole in the thick portion.

(Operation) In the die configured as described above, since the tongue portion is integrally formed in the male die, the supporting structure of the tongue portion by the male die body is a double-supported beam structure. Furthermore, in the male mold, only the tongue part at the tip is a die part that molds metal,
The remaining main body portion serves as a port portion of the hollow chair that regulates the flow of metal, and at the same time has a structure that supports the tip tongue portion. Therefore, since the tongue portion has a double-supported beam structure and is supported by the integral male main body portion, it is extremely strong against bending and bending.

(Embodiment) The structure of a die according to an embodiment will be described with reference to the drawings. A die 2 (see FIGS. 3 and 4) is combined with a male die 2 (see FIGS. 1 and 2) and a die (see FIG. Fig. 6).

The metal 15 (FIG. 6) is formed by first passing through the male die 2 and then the female die 20. Two semi-circular spaces formed between the male die 2 and the die ring 1 into which the male die 2 is fixedly inserted are used as port holes 3a and 3c through which the metals 15a and 15c flow. Also male type 2
A port hole 3b is also provided in the central part of the so as to pass the metal 15b. A tongue portion 5 is formed on the tip of the male die 2 and the tongue portion 5 is formed on the female die 20.
Of the tongue portion 5 and the female die 20 are used as the molding hole 23 (FIG. 6) of the thick portion. At the time of extrusion, the metal 15 mainly passes through the fin portions 4 from the port holes 3a and 3b and flows from the port holes 3c mainly into the thick-walled forming hole 23, and the fin-shaped profile is manufactured.

The tongue portion 5 is integrated with the male main body 7, and the tongue portion 5 is supported by the male main body 7 in a double-supported beam structure (FIG. 3).

When the male die 2 and the female die 20 are combined, the base portion 6 obtained by branching the tongue portion 5 closely fits into the lateral groove 26 of the female die 20, and the front flat portion 7b of the male die body 7 is fitted to the female die 20. Since they come into close contact with the rear flat portion 27, the two (2, 20) are fixed to each other through these portions (6, 26, 27, 27 ') and the metal does not leak. 7a
2 (FIG. 2) serves as a ring-shaped metal passage for sending metal to the thick-walled portion forming hole 23 or the fin portion 4. 8,8 ′,
18, 18 'are bolt holes, and 9, 9', 19, 19 'are knock pins, which are used to position the female mold and the male mold.

According to the embodiment of the present invention, 17 fins, fin thickness about 1 m
A fin-shaped profile with m, fin height of 50 mm, and fin spacing of about 4 mm was produced at the same extrusion speed as that of a standard profile with a Holloday chair.

(Effects of the Invention) Since the present invention is configured as described above, the following effects are achieved.

Since the finned profile is extruded by the male and female type with tongue and the female type, the tongue has a double-supported beam structure, which makes it extremely strong against bending and bending, resulting in die life. Longer and eliminates the need for lower extrusion rates.

Further, by forming the port hole between the die ring for inserting and fixing the male die and the male die, the shape of the die becomes extremely simple as compared with the case where the port hole is formed in the die.

Further, when the port hole is formed along the center axis of the male die, the metal flows out from the port hole outside the male die, from the port hole inside the male die, and merges into the metal to be supplied to the forming part. Since the molding at the fin portion is promoted, it is extremely effective for extruding a finned shaped material having a thin and long fin portion. This effect becomes more remarkable by making the width of the male inner port hole substantially the same as the width of the entire fin of the fin-shaped profile and improving the formability of the entire fin.
Furthermore, by forming a gap between the male tongue part and the female mold so as to form a thick part forming hole, only the fin forming hole is formed in the male mold, which facilitates the machining of the male mold. In addition, the distribution of the molding pressure applied to the male mold can be simplified.

[Brief description of drawings]

1 is a front view of a male mold according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line III-III of FIG. 1, FIG. 3 is a schematic view showing a cantilever structure, and FIG. FIG. 5 is a front view of a female die according to an embodiment of the present invention, FIG. 5 is a central sectional view of FIG. 4, FIG. 6 is an explanatory diagram of a combined male / female die and metal flow, and FIG. It is a front view of a solid die. 1 ... Die ring, 2 ... Male type, 3 ... Port hole, 4 ...
… Fin part, 5 …… Tang part, 7 …… Male type body, 20 ……
Female type, 22 ... Push-in hole

Claims (5)

(57) [Claims] 1. A male die (2) integrally formed with a tongue portion (5) at its tip is inserted and fixed to a female die (20), and a port hole (3) extending in the axial direction of the male die (2). ) Is communicated with the tongue portion (5) and the thick portion molding hole (23). 2. The finned profile material according to claim 1, wherein the port holes (3a, 3c) are formed between the male die (2) and the die ring (1) into which the male die (2) is charged and fixed. Extrusion die. 3. A port hole (3) extending along the central axis of the male mold (2).
The fin-shaped profile extrusion die according to claim 2, wherein b) is formed. 4. The finned profile extrusion die according to claim 1, wherein the width of the port hole (3b) is substantially the same as the width of the entire fin portion of the finned profile. . 5. The method according to claim 1, wherein a gap is formed between the male tongue portion (5) and the female die (20) so as to form the molding hole (23) of the thick portion. The die for extruding a profile with fins according to item.