JPH0679740B2 - Hollow chair for torsion extrusion of hollow torsion material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to the twisting of a hollow torsion material, which is used when a hollow torsion material used in, for example, a supercharger rotor for an automobile or a rotor for a compressor is manufactured by torsion extrusion. TECHNICAL FIELD The present invention relates to an extrusion hollow rice.

2. Description of the Related Art For example, as shown in FIG. 4, a hollow torsion member (100) used for a rotor as described above has an uneven portion (101) which is spiral and continuous along the length direction on the outer circumference. And a hollow portion (102) having a circular cross section.

As a method for producing the above-mentioned hollow twisted material (100), a method by twisting extrusion using mandrel extrusion is conventionally known (for example, Japanese Patent Publication No. 62-63190). This extrusion uses a die having an extrusion hole formed in a cross-sectional shape and a twist angle corresponding to the uneven shape of the twisted material, and extrudes the extruded material from the molding gap formed by the die extrusion hole and the mandrel along the twisted shape of the extrusion hole. It is carried out by extrusion.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the extrusion as described above, when the metal flow of the extruded material is drastically changed from the straight direction to the twisting direction when guided from the container to the molding gap of the die, However, it is difficult to continuously and smoothly guide the extruded material to the molding gap, and the twisted material (100) is liable to have a flesh portion (101a) or dimensional deviation as shown in FIG.

SUMMARY OF THE INVENTION The present invention is intended to solve the above drawbacks and to provide a torsion extrusion hollow chair capable of obtaining a highly accurate torsion material having no wall thickness or dimension deviation.

Means for Solving the Problems In order to achieve the above object, the present invention provides a metal flow with directionality in a twisting direction and a rough shape in advance until reaching a molding gap that finally determines a twisting shape. For this reason, in addition to imparting a twisting directionality to the extrusion material introduction hole of the die male mold, the directionality in the twisting direction of the extrusion material is provided between the die female mold and the die male mold. And an intermediate die female die for giving a rough shape is combined with an intervening state.

That is, the present invention provides a hollow extrusion member (100) for torsional extrusion of a hollow torsion member (100) which has spiral irregularities (101) along the lengthwise direction on the outer periphery thereof, as shown with reference to the drawings. A twisting material is provided on a female die (1) having a twist extrusion hole (13) having a cross-sectional shape and a twist angle corresponding to the uneven shape of (100), and a male die body (31) having an extrusion material introduction hole (34). It comprises a combination of a male die (3) provided with a molding convex portion (32) for forming a hollow portion (102) of (100) and an intermediate die female die (2) interposed therebetween. The extruded material introduction hole (34) is provided with a twist angle so as to give the extruded material a twist directionality in the same direction as the twist material (100), while the intermediate die female die (2) is Similar shape or approximately phase larger than the extrusion hole (13) of the female die (1) A hollow loader for twisting and extruding a hollow twisted material, characterized by having an extrusion material introduction hole (21) formed in a shape and having the same or substantially the same twist angle as the extrusion hole (13). Is the gist.

Action The metal flow of the extruded material extruded from the container through the die into the hollow torsion material (100) is given a direction in the torsion direction in advance by passing through the extrusion material introduction hole (34) of the die male die (3). In this state, it is guided to the extrusion material introduction hole (21) of the female die (2) for intermediate die. Then, by passing through the extrusion material introducing hole (21) of the intermediate die female die (2), a general shape slightly larger than the final shape is imparted while imparting directionality in the twisting direction. In this state, the extruded material is guided to the final molding gap (40), so that the direction of the metal flow no longer changes suddenly. Moreover, since the introduction hole (21) of the intermediate die female die (2) is set to have a larger diameter than the extrusion hole (13) of the die female die (1), the intermediate die female having a rough shape is formed. Even if the peripheral surface of the extruded material in the die (2) is notched, the extruded material is accurately traced along the bearing portion (13a) of the female die for die (1). Therefore, the torsion member (100) having the lead and the cross-sectional shape as designed is finally obtained.

Embodiment Hereinafter, the present invention will be described based on illustrated embodiments.

The die (A) shown in FIGS. 1 to 3 is used for extruding an extruded material made of aluminum or an alloy thereof into a torsion material (100) for a screw rotor having a four-leaf cross section shown in FIG. It is a porthole die.

As shown in FIGS. 1 to 3, the die (A) is composed of a die female die (1), a die male die (3), and an intermediate die female die (2) interposed therebetween. Has been done.

The female die (1) has a positioning protruding edge (12) at the periphery of the flat joint surface (11), and an extrusion hole (P) that penetrates in the thickness direction at the center of the joint surface (11). 13)
This extrusion hole (13) is provided with unevenness (1) on the outer circumference of the hollow torsion member (100).
It has the same cross-sectional shape as that of 01) and is formed in a twisted state from the inlet side to the outlet side at the same twist angle as the twist angle of the hollow torsion member (100). The inner peripheral surface of the extrusion hole (13) constitutes a bearing portion (13a) that defines the outer shape of the torsion member (100).

On the other hand, the male die die (3) has a circular fixed cross-section screw-in type forming convex portion (a hollow portion (102) of the torsion member (100) that is formed at the center of one end surface of the board-shaped male body (31) 32). The peripheral surface of the molding convex portion (32) constitutes a bearing portion (33) which faces the bearing portion (13a) of the female die for die (1) inside. Further, the male main body (31) is provided with four extruded material introduction holes (34) having a substantially square cross section, which penetrate the main body in the thickness direction, around the molding convex portion (32). These extruded material introduction holes (34), as shown in FIG. 1 and FIG. 2, are provided in order to give the metal flow a twist directionality in the same direction as the twist material.
A twist angle is given.

The intermediate die female die (2) has an extrusion material introduction hole (21) penetrating in the thickness direction at the center thereof. The introduction hole (21) gives the extruded material a general shape corresponding to the outer shape of the torsion extruded material (100), and the die female die (1)
The metal flow is imparted with directionality in the twisting direction until it reaches the final molding gap (40) formed between the extrusion hole (13) and the molding convex portion (32) of the die male mold (3). It is for. For that purpose, the extrusion hole (13) of the female die (1) of the die
It has a similar cross-sectional shape that is slightly larger than the above, and the position of the inlet (21a) and outlet (21b) is in a displacement state with the same twist angle as the extrusion hole (13) in the twist direction with respect to the axial direction. Has been formed. The inner diameter of the introduction hole (21) is
About 5-10% from that of the extrusion hole (13) of the female die (1)
It is desirable to set a large value. This offset amount should be individually determined according to the shape of the twisted extruded material (100) and the like, but for example, about 5 mm is preferable for a diameter of 90 mm. The twist angle of the introduction hole (21) is preferably set to be substantially the same as that of the extrusion hole (13) of the female die for die (1).

Then, the female die for die (1) and the female die for intermediate die (2)
And the positioning protrusion edge portion (12) provided on the peripheral edge of the joining surface (11) of the die female die (1) to the intermediate die female die (3).
Of the female die (1) of the die (1) and the outlet (2) of the female die (2) of the intermediate die.
1b) combined with the state that the phase is the same,
The positioning protruding edge portion (23) provided on the peripheral edge of the intermediate die female die (2) is used as the positioning step (3) of the die male die (3).
By being fitted to 5), they are combined together to form a porthole die (A).

In the die (A) having the above structure, the extruded material in the container (4) is pressed to the die side by a stem (not shown), and this pressurizing force pushes it into the extruded material introducing hole (34) of the male die (3) of the die. After flowing in and being guided to the introduction hole and advanced, it is introduced into the extrusion material introduction hole (21) of the female die (2) for intermediate die. After advancing along the twisted shape of the introduction hole (21), it passes through the extrusion hole (13) of the female die (1) of the die and is extruded into the hollow torsion extruded material (100). In the extrusion process during this period, the metal flow of the extrusion material is given a general shape while being given directionality in the twisting direction by passing through the extrusion hole (21) of the intermediate die female die (2). Therefore, immediately after being introduced into the extrusion hole (13) of the female die (1), the extrusion hole is maintained in the same direction as the twisted shape of the extrusion material introduction hole (21) as shown by the arrow in FIG. You will pass (13). Therefore, before and after reaching the molding gap (40) that determines the final shape, the extrusion can be smoothly performed without causing a rapid change in the metal flow. Moreover, the introduction hole (21) of the intermediate die female die (2) has the die female die (1).
Since the diameter is set slightly larger than the extrusion hole (13) of the die, even if a part of the outer peripheral surface of the metal flow that has passed through the intermediate die female die (2) has a slight wall thickness, the die female die The hollow twisted extruded material having the outer shape and the twist angle as designed is accurately traced along the entire circumference of the bearing portion (13a) of (1).

In the illustrated embodiment, the twist amount of the intermediate die female die (2) is set to be the same as that of the die female die (1), but it is not always required to be equal, and the point is that the metal flow has a directionality in the twisting direction. The amount of twist that can give is not limited, and its size is not limited. However, setting or approximating the twist angle of the twisted material as in the example makes almost no change in the direction of metal flow before and after reaching the final forming gap (40), or minimizes it. Is most preferable because it can be obtained.

In addition to the porthole die shown in the embodiments, the present invention can be applied to various kinds of spider dies, bridge dies, etc.

EFFECT OF THE INVENTION The die according to the present invention, as described above, is provided with a die male die having an extrusion material introduction hole to which a twist angle is imparted, and between a die male die and a female die for twist extrusion,
To give the extruded material that has passed through the introduction hole a twisting directionality in the same direction as the twisted material and a rough shape corresponding to the twisted material, a similar shape or a substantially similar shape having a diameter larger than that of the extrusion hole of the female die for die. An intermediate die female die having an extruded material introduction hole that is formed and has the same or substantially the same twist angle as the extruded hole is combined in an intervening state. Therefore, the metal flow of the extruded material extruded from the container through the die can be imparted with a twist direction by passing through the male die extruded material introduction hole, and further, the intermediate die female extruded material introduction hole can be provided. By passing through, it is possible to give a twisting direction in the same direction as the twisting member and a general shape corresponding to the twisting member. Moreover, it is possible to eliminate a sudden change in the directionality of the metal flow before and after reaching the final molding gap, and it is possible to extrude smoothly and continuously.

Further, the introduction hole of the female die for the intermediate die is set to a similar shape or a substantially similar shape with a diameter larger than that of the extrusion hole of the female die for the die, so that even if the extruded material passing through the female die for the intermediate die has a slight lack of thickness. Even if generated, the extruded material is accurately traced along the entire circumference of the female die type die bearing part, resulting in a highly accurate twisted extruded product with almost the same dimensions as designed, with almost no missing or dimensional deviation. Can be provided.

Incidentally, when extruded with a conventional twist extrusion hollow rice, a partial wall thickness was observed on the surface of the torsion material, but when extruding an aluminum torsion material of the same shape using the combination die according to the illustrated example, No flesh was found.

[Brief description of drawings]

FIGS. 1 to 3 show a torsion extrusion hollow chair according to an embodiment of the present invention. FIG. 1 is a front view showing a developed die female die, an intermediate die female die, and a die male die. 2 is a perspective view before combination, FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 in a state where both dies are combined, and FIG. 4 is a perspective view of a torsion member manufactured by the dies, FIG. FIG. 4 is a cross-sectional view of a twisted material manufactured by a conventional die. (1) ... female die, (2) ... intermediate female die,
(3) …… Male die, (13) …… Extrusion hole, (21) ……
Intermediate die female die extrusion material introduction hole, (31) …… Male die body, (34) …… Die male die extrusion material introduction hole, (100)
…… Torsion material, (101) …… Concavo-convex, (A) …… Torsion extrusion hollow chair.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-53-137855 (JP, A) JP-B 59-9248 (JP, B2) JP-B 49-40781 (JP, B2)

Claims (1)

[Claims] 1. A spiral irregularity (10
A hollow extruder for hollow extrusion of a torsional material (100) having (1), comprising a female die (1) having a torsional extrusion hole (13) having a cross-sectional shape and a torsion angle corresponding to the uneven shape of the torsional material (100). ) And a male main body (31) having an extrusion material introduction hole (34) and a molding convex portion (32) for forming the hollow portion (102) of the torsion member (100), the male male die (3). And an intermediate die female die (2) interposed between them, the extruded material introducing hole (34) provides the extruded material with a twist directionality in the same direction as the twisted material (100). While the twist angle is given to give, the intermediate die female die (2) is formed in a similar shape or a substantially similar shape having a diameter larger than the extrusion hole (13) of the die female die (1), and A pusher provided with the same or substantially the same twist angle as the extrusion hole (13). And wherein the one having a material introduction hole (21), Horodaisu for twisting extruded hollow torsion member.