JPH11129025A - Extruding tool for extruding hollow material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extruding tool of such a structure that can prevent large deflection of the die bridge portion and large stress from being imposed, thereby preventing damages of the die components. SOLUTION: This extruding tool for extruding hollow materials is equipped with a hard body 4 made ofcemented carbide in such a way as to cover the back face of die bridge portion 9 along its longitudinal direction, and also engaged in a recessed portion 13 provided in the front face of a plate bridge portion 12 in such a way that it can be brought into contact with the rear face of the die bridge portion 9 by displacing in the back/forth direction, and holes 14 opened to the rear of the plate bridge portion 12 are provided on the bottom face of the recessed portion 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion tool used for extruding a hollow material made of metal such as aluminum, for example, a flat porous tube material for a heat exchanger.

[0002]

2. Description of the Related Art For example, extrusion of a flat porous tube material (1) used in a heat exchanger such as a condenser for a car cooler shown in FIG.
A precision extrusion die (52) is used.

The extrusion die (52) comprises a cemented carbide female die (55) having a flat forming hole (55a) for forming the outer peripheral shape of the tube material (1), and a hollow portion of the tube material (1). A flat-plate shaped cemented carbide osmandrel (56) having a comb-shaped hollow molded portion (56a) for molding the portion (1a), and these female molds (55) and osmandrel (56) It is divided into holders (57) made of die steel for holding. The holder (57) has an annular base (58) for holding the female mold (55) and a die bridge (59) for holding the male mandrel (56).
The die bridge portion (59) is formed so that the annular base portion (5) crosses the annular base portion (58).
8) A rearwardly projecting portion is provided. The female type (55) is provided with an annular base portion (58) of the holder (57).
Osmandrel (56)
Are inserted and arranged in a slit-like hole (59a) formed in the die bridge portion (59) in a front-rear direction so as to protrude forward, and these are integrated by shrink fitting to form a female mold (55). ) And a forming gap (60) corresponding to the cross-sectional shape of the flat porous tube material (1) between the forming hole (55a) and the hollow forming portion (56a) of the male mandrel (56).
Are formed to constitute an extrusion die (52).

[0004] In the extrusion, a plate (53) made of die steel is combined with the rear part of the extrusion die (52) so that the die bridge part (59) and the plate bridge part (62) are arranged in a corresponding state. An extruding tool is used, and an extruding material, for example, a billet metal made of aluminum is supplied from the rear of the extruding tool, and is passed through the forming gap (60) of the extruding die (52). Thereby, a flat perforated tube (1) as shown in FIG. 7 is obtained.

[0005]

However, in the extrusion tool having the above-described structure, the plate bridge (62) is bent by the pressing during the extrusion, and the bending causes the plate bridge (62) to move the extrusion die (62). 52) may come into contact with the dice bridge portion (59). Especially,
The contact of the plate bridge portion (62) with the die bridge portion (59) occurs at the longitudinal center of the die bridge portion (59).

[0006] Then, the local concentrated contact causes a large bending of the die bridge portion (59), which causes a relative displacement between the male mandrel (56) and the female mold (55). And, as a result, uneven thickness or steppedness may be caused in the tube material (1).

In addition, as described above, the bending of the plate bridge portion (62) causes the plate bridge portion (6) to be bent.
2) The die bridge part (59) of the extrusion die (52)
When the ridge bridge (59) is locally concentrated in contact with the central portion in the longitudinal direction, a large stress is applied to the die bridge portion (59), and there is a problem that the stress may cause breakage such as a crack in a die component. .

In particular, the extrusion die (52) is divided into a flat plate-shaped osmandrel (56) and a holder (57), and a slit-like hole (59a) in a die bridge portion (59) of the holder (57). ) In which a flat plate-shaped osmandrel (56) is inserted and held, particularly in such a structure where the osmandrel (56) and the holder (57) are integrated by shrink fitting. ,
The stress acting on the die bridge portion (59) is transmitted to the osmandrel (56), and may cause the osmandrel (56) to crack.

Therefore, a predetermined distance is provided between the plate bridge part (62) and the die bridge part (59), so that even if the plate bridge part (62) bends, the plate bridge part (62) is formed by the die. Bridge (59)
There is also a structure that does not come into contact with.

However, in this case, a large amount of extruded material enters between the plate bridge portion (62) and the die bridge portion (59) from the side, and the pressure of the extruded material causes the die bridge portion (59). ) Is caused to bend, causing a problem similar to the above.

In view of the above-mentioned conventional problems, the present invention can suppress the occurrence of large deflection or large stress on the die bridge portion during extrusion, so that the shape and shape can be suppressed. An object of the present invention is to provide an extrusion tool for hollow material extrusion having a structure capable of extruding a hollow material having excellent dimensional accuracy and preventing undesired breakage of a die component.

[0012]

An object of the present invention is to provide an extrusion tool for hollow material extrusion in which a plate bridge portion is provided at a rear portion of a die bridge portion in a correspondingly arranged state. In addition, the hard body,
The problem is solved by an extrusion tool for hollow material extrusion, wherein the extrusion tool is provided along the longitudinal direction of the die bridge portion. Needless to say, “rear” or “front” is a concept when the direction in which the extruded material is extruded is set to the front.

That is, in this extruding tool, for example, when the plate bridge portion is bent by the pressing during extrusion and the plate bridge portion contacts the hard body, and the hard body contacts the die bridge portion, Since the body has high rigidity, it is difficult to bend. Therefore, the hard body uniformly presses the dice bridge portion in the longitudinal direction, whereby the amount of flexure of the dice bridge portion is suppressed to be small and the dice bridge portion is applied. Stress is also dispersed. Therefore, the deviation of the relative positional relationship between the male and female is reduced, and a hollow material excellent in shape and dimensional accuracy is extruded, and
It is also possible to prevent the die components from being damaged.

In addition, the hard body is provided so as to cover the back surface of the die bridge portion along the longitudinal direction, and the hard body is provided in a recess provided in a front surface of the plate bridge portion. By being displaced in the front-rear direction and fitted so as to be able to abut on the rear surface of the die bridge portion, and having a hole that is open behind the plate bridge portion on the bottom surface of the recess, During the extrusion, the hard body is urged toward the rear side of the die bridge by the pressing of the material acting through the hole provided in the plate bridge, and covers the rear side of the die bridge. Therefore, it is possible to prevent the extruded material from entering between the die bridge portion and the hard body, and between the hard body and the plate bridge portion, and the pushing by the extruded material trying to enter the die bridge portion from the side acts. This can prevent the bending of the die bridge and the load on the die bridge due to the pressure of the extruded material. Moreover, the pressure of the extruded material acts on the hard body through the hole of the plate bridge portion, but the hard body has high rigidity and is hard to bend as described above, so the hard body uniformly presses the die bridge portion in its longitudinal direction, As a result, the amount of deflection of the die bridge portion is kept small, and the stress applied to the die bridge portion is dispersed. Accordingly, the deviation of the relative positional relationship between the male and female is reduced, so that the hollow material having excellent shape and dimensional accuracy can be extruded, and the die component can be prevented from being damaged.

Further, even when the plate bridge portion bent by the pressing during extrusion does not strongly contact the hard body, the hard body covers the back side of the die bridge portion, and the hard body has a high height. By pressing the die bridge portion evenly in the longitudinal direction by the rigidity, the same operation and effect can be obtained.

Another object of the present invention is to provide an extrusion tool for hollow material extrusion in which a plate bridge portion is provided at a rear portion of a die bridge portion in a corresponding arrangement state, wherein the plate bridge portion is reinforced by a hard body. The feature is also solved by a featured extrusion tool for hollow material extrusion.

That is, by adopting such a configuration,
The amount of deflection of the plate bridge itself due to pressure during extrusion is reduced. In addition, the gap between the plate bridge portion and the die bridge portion can be reduced thereby. Therefore, the plate bridge portion does not contact the die bridge portion, or the contact force is reduced, so that the gap between the plate bridge portion and the die bridge portion can be reduced. Therefore, the bending of the die bridge and the stress on the die bridge are reduced. As a result, the deviation of the relative positional relationship between the male and female is reduced, so that a hollow material having excellent shape and dimensional accuracy is extruded, and damage to the components constituting the die can be prevented.

In each of the above-mentioned extrusion tools, the die bridge portion is provided with a slit-shaped hole penetrating the die bridge in the front-rear direction, and the slit hole has a hollow forming portion for forming a hollow portion of a hollow material. Effectively prevents the flat osmandrel from being broken or other inadvertent damage during extrusion by ensuring that the appropriate osmandrel is properly inserted, arranged, and held Is done.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings.

The extrusion tool according to the present embodiment is an object to be extruded from a flat porous tube material (1) used in a heat exchanger such as a condenser for a car cooler as shown in FIG.

In the extrusion tool of the first embodiment shown in FIGS. 1 to 4, (2) is an extrusion die, (3) is a plate, and (4) is a hard body.

The extrusion die (2) is the same as the above-mentioned conventional extrusion die, and is a female mold made of cemented carbide having a flat forming hole (5a) for forming the outer peripheral shape of the tube material (1). (5) and hollow portion (1a) of tube material (1) ...
A flat-plate shaped cemented carbide osmandrel (6) having a comb-shaped hollow molded portion (6a) for forming a sword, and a die steel holding these female mold (5) and osmandrel (6) And a holder (7). The holder (7) integrally has an annular base (8) for holding the female die (5) and a die bridge (9) for holding the male mandrel (6).
Is provided so as to protrude rearward at the rear of the annular base portion (8) so as to cross the annular base portion (8). The female type (5) is fitted and arranged in the annular base portion (8) of the holder (7), and the male mandrel (6) is formed in a slit formed in the die bridge portion (9) so as to penetrate in the front-rear direction. The hole (9a) is inserted and arranged in a protruding forward direction. These are integrated by shrink fitting, and the cross-sectional shape of the flat porous tube material (1) is formed between the forming hole (5a) of the female mold (5) and the hollow forming portion (6a) of the male mandrel (6). The extrusion die (2) is formed by forming a molding gap (10) corresponding to the above.

The extrusion die (2) is provided with a recess (1) provided in the front side of a die steel plate (3).
It is set in 1) and constitutes a plate (3) and an extrusion tool. In this combined state, the plate bridge section (12) of the plate (3) is provided in a corresponding arrangement state at the rear of the die bridge section (9) of the extrusion die (2).

The hard body (4) is made of a cemented carbide material and is provided between the plate bridge (12) and the die bridge (9). The rigid body (4) has a length along the entire length or almost the entire length of the die bridge portion (9) and covers the rear surface of the die bridge portion (9). It is formed in a recess (13) formed in the front surface of the plate bridge portion (12), and is displaced in the front-rear direction so as to be able to contact the rear surface of the die bridge portion (9), that is, the rear surface. Are set in a nested manner. Hard body (4)
Is preferably subjected to a surface treatment by CVD or PVD using TiC, TiN, VC, or the like for cleaning with caustic resistance. In the bottom of the recess (13) of the plate bridge (12), a plurality of holes (14) are provided at intervals along the longitudinal direction thereof, each of which is open behind the plate bridge (12). It is open.

In the above extrusion tool, the plate bridge (12) is bent by the pressing during the extrusion, so that the bottom surface of the recess (13) of the plate bridge (12) comes into contact with the hard body (4), and When the body (4) comes into contact with the rear surface of the dice bridge (9), the dice bridge (9) is pressed by the hard body (4). The part (9) is pressed uniformly on the rigid body (4) in its longitudinal direction. This allows
The amount of deflection of the die bridge portion (9) is suppressed to a small value, and the stress on the die bridge portion (9) acts in a distributed manner. Therefore, the deviation of the relative positional relationship between the male and female is reduced, so that the hollow material having excellent shape and dimensional accuracy is extruded, and the die component can be prevented from being damaged. Moreover, during the extrusion, the hard body (4) is urged toward the back side of the die bridge (9) by the pressure acting through the hole (14) provided in the plate bridge (12), and the die bridge is formed. Cover the back side of (9).
Therefore, there is no intrusion of the extruded material between the die bridge portion (9) and the hard body (4), and direct pressing by the extruded material on the die bridge portion (9) is prevented. Die bridge part by pressure of such extruded material (9)
And the load on the die bridge portion (9) is eliminated. In this case, the pressure of the extruded material acts on the hard body (4) through the hole in the plate bridge portion. However, the hard body (4) has high rigidity as described above, so that it hardly bends and the hard body (4) Presses the dice bridge portion (9) uniformly in the longitudinal direction, thereby suppressing the amount of deflection of the dice bridge portion (9) and reducing the stress applied to the dice bridge portion (9) as described above. Distributed. As described above, the deviation of the relative positional relationship between the male (6) and the female (5) is reduced, and the tube material (1) having excellent shape and dimensional accuracy is extruded, and the male mandrel (6) is cracked. Is prevented from being damaged.

On the other hand, even in the case where the plate bridge portion (12) bent by the pressing during the extrusion does not cause the bottom surface of the recess (13) to strongly contact the hard body (4), the hard body ( 4) is pressed through the hole (14),
It is displaced toward the die bridge part (9) to cover the back side of the die bridge part (9), and prevents the extruded material from entering between the die bridge part (9) and the hard body (4). Not only the rigid body (4) which is pressed through the hole (14)
Presses the die bridge portion (9) evenly in the longitudinal direction due to its high rigidity. Therefore, also in this case, similar effects such as extrusion of the tube material (1) having excellent shape and dimensional accuracy and prevention of cracking of the male mandrel (6) are exhibited.

Further, the hard body (4) is pressed and held on the rear surface of the die bridge part (9) by the pressing through the hole (14), so that the male mandrel (6) is unintentionally pulled backward by the back pressure. It can be effectively prevented.

In the extrusion tool according to the second embodiment shown in FIGS. 5 and 6, the plate (3) is provided with two recesses (11) and (11) for setting an extrusion die, and each recess (11) is provided. )
It is configured as a multiple simultaneous extrusion type in which the extrusion dies (2) and (2) are set in (11). The plate bridge portion (12) of the plate (3) is provided in a corresponding arrangement state at the rear of each of the extrusion dies (2) (2) set as described above. Then, both extrusion dies (2) are provided on the rear surface of the plate bridge portion (12).
A recess (16) is provided across the entire length of the plate bridge portion (12) or beyond the plate bridge portion (12), and the rigid body (4) fits in the recess (16) in a conforming manner. The plate bridge (12) is reinforced.

In the extrusion tool of this embodiment, since the plate bridge portion (12) is reinforced by the hard body (4), the amount of deflection of the plate bridge portion (12) itself due to pressing during extrusion is reduced. . In addition, the gap between the plate bridge portion (12) and the die bridge portion (9) can be reduced thereby. Therefore, the extruded material that the plate bridge portion (12) does not contact with the die bridge portion or has a small contact force, and that enters the gap between the plate bridge portion (12) and the die bridge portion (9). Can be reduced, and the bending (9) of the die bridge portion and the stress on the die bridge portion (9) can be reduced.
The deviation of the relative positional relationship between the male and female is reduced
The tube material (1) having excellent dimensional accuracy is extruded, and breakage such as cracking of the male mandrel (6) is prevented.

Moreover, in the present embodiment, since the hard body (4) is provided on the rear surface side of the plate bridge (12), the hard body (4) can be easily incorporated into the plate bridge (12). In addition, the rigid body (4) receives the pressure directly, so that the bending of the plate bridge portion (12) can be effectively suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention. For example, regarding the structure in which a hard body is provided between the plate bridge portion and the die bridge portion, in the above embodiment, a recess (13) is provided on the front surface of the plate bridge portion (12), and the recess (13) is provided. 13) shows a structure in which a hole (14) is provided on the bottom surface. However, the present invention is not limited to this, and the point is that the plate bridge is bent by the pressing during extrusion, and the plate bridge is bent. In the case where the hard body abuts on the dice bridge part while contacting the hard body, the hard material can press the dice bridge evenly in the longitudinal direction, so that the plate bridge part and the dice bridge part are connected to each other. Anything provided in between may be used. In addition, the present invention provides the first extrusion tool for a plurality of simultaneous extrusion types.
A hard body may be provided in the embodiment type, or a single body extrusion type extrusion tool may be provided with the hard body in the second embodiment type. Further, the hard body in the present invention is not limited to a cemented carbide, but may be a ceramic or the like. In short, any material having a larger Young's modulus than the die steel may be used. Further, the extrusion die in the present invention may be a porthole type die having a bridge portion between the port holes, or a structure in which an osmandrel is integrally provided with the bridge portion in such a porthole type die. May be used. In short, it is only necessary that the hodice has a bridge portion. Further, in the above embodiment, the flat tube material (1) for a heat exchanger is configured to be extruded, but hollow extruded materials of various shapes and various sizes may be configured to be extruded.

[0032]

As described above, the extrusion tool for hollow material extrusion according to the present invention is an extrusion tool for hollow material extrusion wherein a plate bridge portion is provided at a rear portion of a die bridge portion in a corresponding arrangement state. Since the rigid body is provided along the longitudinal direction of the die bridge portion between the die bridge portion and the plate bridge portion, for example, the plate bridge portion is bent by pressing during extrusion. When the plate bridge portion abuts the hard body and the hard body abuts the die bridge portion, the hard body uniformly presses the die bridge portion in its longitudinal direction,
The amount of bending of the die bridge portion can be reduced, and the stress applied to the die bridge portion can be dispersed.
Therefore, it is possible to reduce the deviation of the relative positional relationship between the male and female, to extrude a hollow material having excellent shape and dimensional accuracy, and to prevent the die component from being damaged.

In addition, the hard body is provided in a mode that covers the back surface of the die bridge portion along the longitudinal direction thereof, and the hard body is provided in a recess provided in the front surface of the plate bridge portion. By being displaced in the front-rear direction and fitted so as to be able to abut on the rear surface of the die bridge portion, and having a hole that is open behind the plate bridge portion on the bottom surface of the recess, During extrusion, the rigid body covers the back side of the die bridge part, preventing the intrusion of the extruded material between the die bridge part and the rigid body, and the bending of the die bridge part due to the pressure of the extruded material and the like. The load on the die bridge can be eliminated.
In addition, the rigid body does not bend due to the pressure of the extruded material acting through the holes in the plate bridge, and the hard body presses the die bridge evenly in the longitudinal direction to minimize the amount of deflection of the die bridge. At the same time, the stress applied to the die bridge portion can be dispersed. Therefore, it is possible to more effectively extrude a hollow material having excellent shape and dimensional accuracy by reducing the disorder of the relative positional relationship between the male and female, and to prevent breakage of the die component. . Also, when the plate bridge portion bent by the pressing during the extrusion does not strongly contact the hard body, the hard body covers the back side of the die bridge part, and the hard body has a high rigidity. By pressing the bridge portion evenly in the longitudinal direction, the same operation and effect can be obtained.

Another extrusion tool according to the present invention is an extrusion tool for hollow material extrusion wherein a plate bridge portion is provided at a rear portion of a die bridge portion in a corresponding arrangement state, wherein the plate bridge portion is reinforced with a hard body. Therefore, the amount of deflection of the plate bridge itself due to pressing during extrusion is reduced, and the plate bridge does not contact the die bridge or the contact force is reduced. Therefore, the gap between the plate bridge portion and the die bridge portion can be reduced, and the amount of extruded material into the gap can be reduced. As a result, the bending of the die bridge and the stress on the die bridge can be reduced, and the deviation of the relative position between the male and female can be reduced, and a hollow material having excellent shape and dimensional accuracy can be extruded. In addition to this, it is possible to prevent the components constituting the die from being damaged.

In each of the extrusion tools described above, the die bridge portion is provided with a slit-shaped hole penetrating the die bridge in the front-rear direction, and the slit hole has a hollow forming portion for forming a hollow portion of a hollow material. That the flat osmandrel is properly inserted and arranged and held, effectively preventing undesired breakage such as cracks in such a flat osmandrel during extrusion can do.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an extrusion tool according to a first embodiment.

FIG. 2 is a sectional view taken along line II of FIG. 1;

FIG. 3 is a rear end view of the extrusion tool excluding a plate bridge portion.

FIG. 4 is a perspective view showing the extrusion tool constituent members in a separated state.

FIG. 5 is a rear end view showing an extrusion tool according to a second embodiment.

FIG. 6 is a sectional view taken along line II-II of FIG.

FIG. 7 is a perspective view of a heat exchanger tube material to be extruded.

8A and 8B show a conventional extrusion tool, and FIG. 8A is a cross-sectional view, and FIG. 8B is a rear end surface of the extrusion tool excluding a plate bridge portion.

[Explanation of symbols]

 2 ... Extrusion die 3 ... Plate 4 ... Hard body 6 ... Osmandrel 9 ... Dice bridge part 12 ... Plate bridge part 13 ... Concave part 14 ... Hole

Claims (4)

[Claims] 1. An extrusion tool for hollow material extrusion wherein a plate bridge portion is provided at a rear portion of a die bridge portion in a corresponding arrangement state, wherein a hard body is provided between the die bridge portion and the plate bridge portion. An extrusion tool for hollow material extrusion processing, wherein the extrusion tool is provided along the longitudinal direction of the portion. 2. The hard body is provided in a mode that covers the back surface of the die bridge portion along the longitudinal direction thereof, and the hard body is provided in a recess provided in a front surface of the plate bridge portion. 2. A hole which is displaced in the front-rear direction and is fitted so as to be able to abut on a rear surface of the die bridge portion, and a hole which is opened on the bottom surface of the concave portion is provided behind the plate bridge portion. Extrusion tool for hollow material extrusion. 3. An extrusion tool for hollow material extrusion wherein a plate bridge portion is provided at a rear portion of a die bridge portion in a corresponding arrangement state, wherein the plate bridge portion is reinforced by a hard body. Extrusion tool for material extrusion. 4. A flat osmandrel having a slit-shaped hole penetrating the die bridge portion in the front-rear direction and having a hollow forming portion for forming a hollow portion of a hollow material in the slit hole. The extrusion tool for hollow material extrusion according to any one of claims 1 to 3, wherein the extrusion tool is inserted and held.