JP3247223B2 - Extrusion tool for extruding metal hollow materials such as aluminum - Google Patents

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 metal material such as aluminum.

[0002]

2. Description of the Related Art For example, an extrusion tool as shown in FIG. 10 has been considered as an extrusion tool for extruding a hollow extruded material made of aluminum. That is, the extrusion tool includes an extrusion die (51) and a flow control mold member (52) arranged adjacent to the rear of the extrusion die (51). The extrusion die (51) has a core holding hole (54) in its bridge portion (53), and a core (55) is inserted into the core holding hole (54) in the hollow molding portion ( In a mode in which the molding gap (58) is formed between the bearing hole (57) and the bearing hole (57) by projecting the front 56), it is inserted and arranged so that it can be pulled out rearward,
The bearing is held by a bearing pin (59). In addition, the flow control mold member (52) coincides with or substantially coincides with the bridge (53) in order to suppress the pressure of the extruded material to the rear end of the bridge (53) of the extrusion die (51). It has a bridge section (60) that will be installed next. The bridge between the bridge (60) of the mold member (52) for flow control and the bridge (53) of the die (51) for extrusion has a bridge between the mold for flow control due to the pressure of the extruded material during extrusion. In order to prevent the bridge part (60) from interfering with the dice bridge part (53) due to the bending of the part (60), both bridge parts (5
3) A predetermined space (61) is formed between (60).

[0003]

However, the core (55) can be pulled out rearward in the core holding hole (54) of the bridge portion (53) as described above in consideration of the convenience of replacement. For example, the core (55) is moved by the flow control mold member bridge portion (6) due to an external impact or the like when setting the extrusion tool to the extruder.
0) and the extrusion die bridge portion (53), the displacement may be inadvertently caused rearward by using the space (61). Therefore, the hollow molding portion (56 ) Is displaced rearward of the bearing hole (57), and when extrusion is performed, there is a problem that the hollow portion of the extruded material is not extruded into an appropriate hollow portion. Further, in the case of the above configuration, since the space (61) between the two bridge portions (53) and (60) is narrow, a tool or the like is inserted from outside to return the core (55) to the normal position. That was practically impossible.

Further, a cemented carbide is used as the core (55),
If die steel is used for the bridge part (53), the core (55) and the bridge part (53) may loosen due to the difference in thermal expansion between them, causing the extruder to be extruded. At the time of setting, the core (55) is easily displaced rearward, which may cause the same problem as described above.

The present invention has been made in view of the above-mentioned conventional problems, and while maintaining a required space between a bridge portion of a flow control mold member and a bridge portion of an extrusion die, the present invention has been developed. An object of the present invention is to provide an extrusion tool having a structure capable of effectively restricting undesired rearward displacement of a child.

[0006]

In order to achieve the above object, according to the present invention, a core holding hole is provided in a bridge portion, and the core has a hollow molded portion protruding forward in the core holding hole. In the state, the extrusion die held so as to be able to be pulled out backward, and a bridge portion, in a manner that the bridge portion matches or substantially coincides with the bridge portion of the extrusion die, and
In a mode in which a predetermined space is provided with respect to the die bridge portion, a flow control mold member disposed adjacent to a rear portion of the extrusion die is provided, and a bridge portion of the extrusion die and a flow control mold are provided. A core removal restricting member is disposed between the bridge portion of the mold member and the core holding hole so as to be movable in the front-rear direction, and a part of the core removal restricting member is provided with a flow control metal. An extruding tool for extruding a hollow material made of metal such as aluminum, which is protruded laterally from a bridge portion of a mold member, is provided.

[0007]

[Function] In the above structure, in a state where the extruding tool is assembled,
When the core is displaced rearward by utilizing the space between the bridge portion of the extrusion die and the bridge portion of the flow control mold member, the side from the bridge portion of the flow control mold member is used. The core is returned to the normal holding position by, for example, piercing the side protruding portion of the core removal restricting member protruding toward the outside with a tool or the like.

After the start of the extrusion, the extruded material interferes with the side protrusion of the core removal restricting member, whereby the core removal restricting member holds the core in the proper holding position. Works.

[0009]

Next, an embodiment of the present invention will be described.

In each embodiment of the present invention described below, the extruded material to be extruded is a flat aluminum harmonica tube material (FIG. 9) used for an air conditioner heat exchanger. E). And
The extrusion tool is a so-called multiple simultaneous extrusion type for simultaneously extruding a plurality of the tube materials (E).

The extruded material to be extruded with the extrusion tool of the present invention is not limited to the above-mentioned heat exchanger tube material (E), but may be hollow or solid having various shapes and uses. It may be an extruded material. The material of the extruded material is not limited to aluminum, but may be any other metal suitable for extrusion. Further, the type of the extrusion tool is not limited to the multiple extrusion type, but may be a single extrusion type.

In the extrusion tool shown in FIGS. 5 and 6, (1) and (1) are extrusion dies, (2) is a hold mold member, (3) is a flow control mold member, and (4). Is a core removal restricting member. (5) is a backer.

As shown in FIGS. 1 to 4, in the extrusion die (1), (9) is a core, (7) is an annular base portion, (8) is a bridge portion, and (10) is a core. It is a bearing pin.

The core (9) is made of a hard material such as a cemented carbide, and has a rectangular plate shape.
A comb-shaped hollow molded part (11) for molding the hollow part of the flat tube material for a heat exchanger is formed. Further, a circular bearing hole (12) is formed through the center of the rear end in the width direction. Note that ceramics or the like may be used as the hard material. The same applies to each component member made of a hard material below.

The annular base portion (7) is made of die steel, and has a small female die (14) having a divided structure disposed in the shaft hole (13). The small female die (14) has a plate-shaped bearing member (16) having a thickness that matches or substantially matches the bearing length of the bearing hole (15), a backup member (17), and a holding member (18). And a restraining member (19), each of which is made of a hard material such as a cemented carbide. The backup member (17) and the holding member (18) are integrated with the annular base (7) by shrink fitting. Bearing member (17) and holding member (19)
And can be removed without shrink-fitting, with the lower surface supported on the back-up member (17), with the outer surface fitted in the holding hole (20) of the holding member (18). Are located in

The bridge portion (8) holds the core (9) and is made of die steel. The bridge portion (8) projects backward from the annular base portion (7) and crosses the shaft hole (13) of the annular base portion (7). It is molded integrally. The bridge portion (8) is provided with a slit-shaped core holding hole (22) penetrating in the front-rear direction, so that the core (9) is disposed in the holding hole (22) in an outer periphery-fit state. Has been made. A groove-shaped notch is formed in the inner peripheral wall on the rear end side of the core holding hole (22) at the center in the width direction of both peripheral walls on the wide side, and the innermost wall has a notch facing the rear in the extrusion direction. Flat step surfaces (23) and (23) are provided for supporting the pin ends.

The bearing pin (10) holds the core (9) in the bridge (8), and is made of a hard material such as a cemented carbide, and supports the core (9). The bearing hole (12) is inserted into the hole (12) so that the outer periphery fits, and both ends of the hole are supported.
A flat portion (24) is formed on one side of a short columnar piece having a size protruding outward.

The core (9) has a base end support hole (1).
In the state where the support pin (10) is inserted and arranged in a protruding state at both ends in 2), the support pin (10) is inserted into the core holding hole (22) from behind and the both ends of the support pin (10). The part is brought into contact with the supporting cross-sections (23) and (23) in the holding hole (22) to be supported. Thereby, the core (9)
, While withdrawal toward the front in the extrusion direction is regulated,
When the core (9) is replaced due to wear or the like, it is allowed to be pulled out backward in the extrusion direction.

In this holding and supporting state, the core (9) has its hollow end portion (11) disposed in the bearing hole (15) to correspond to the cross-sectional shape of the flat tube for a heat exchanger. A molding gap (25) having a cross-sectional shape is formed, and its base end is arranged so as to coincide with or substantially coincide with the rear end face of the bridge portion (8).

The holding die member (2) is a large disc-shaped member made of die steel, has two holding holes (27), (27), and has two extrusion dies (1) ( 1)
Into the respective holding holes (27) and (27) in the annular base portions (7) and (7), and the die (1)
(1) is held.

The flow control mold member (3) controls the flow of the extruded material fed into the dies (1), (1), and is made of die steel. As shown in FIG. The holding mold member (2) is combined with the rear side. As shown in FIG. 6, the flow control mold member (3) is provided with a bridge (30) for dividing the material flow hole into a plurality of material flow holes (29). The bridge portion (30) is provided so as to cover the bridge portions (8) and (8) of the dies (1) and (1) held by the holding mold member (2) from behind, thereby forming an extruded material. Pressure is prevented from directly acting on the bridge (8) of the die (1). In addition, the front end face in the extrusion direction of the flow control mold member (3) is provided at the bridge portion (30) of the flow control mold member (3) in accordance with the position of the dies (1) and (1). Dice (1) provided with accommodation recesses (31) and (31)
Is accommodated in the accommodating recess (31). And, as shown in FIG.
A predetermined space (35) is provided between the bridge portion (8) of the die (1) and the bridge portion (30) of the mold member (3) for flow control, and is determined by the pressure of the extruded material during extrusion. The bending of the bridge portion (30) of the flow control mold member (3) prevents the bridge portion (30) from interfering with the bridge portion (8) of the die (1). Also,
The bridge portion (30) of the flow control mold member (3) is located at the center in the width direction of the core holding hole (22) of the bridge portion (8) of the die (1) and has a bridge width direction groove. A positioning recess (37) is formed, and the core removal restricting member (4) disposed therein is positioned in the longitudinal direction of the bridge (8).

The core removal restricting member (4) is a U-shaped member made of die steel, as shown in FIG.
At the bridge (8) of the die (1), the middle side (3
8) is oriented in the width direction of the bridge portion (8), and is fitted from behind with the bridge portion (8) sandwiched between the side portions (39) and (39). The core removal member (4) has an intermediate side (38) having a die (1).
The center of the bridge (8) of the die (1) is fitted so as to cross the center of the core holding hole (22) in the wide direction, and the middle side (38) of the core (9) is The rear end face is arranged close to or slightly adjacent to the rear end face so as to form a gap (40). This gap (40) is set to, for example, about 0.02 mm. By such a fitting form, the core removal restricting member (4) is positioned in the width direction of the bridge portion (8), and furthermore, as described above, the positioning concave portion (3) of the flow control mold member (3). In addition to positioning in the longitudinal direction of the bridge portion (8) by engagement with the die 37, the positioning is maintained between the die (1) and the flow control mold member (3). I have. In addition, in a state where the flow control mold member (4) is combined with the rear part of the hold mold member (2), both ends (41) (41) of the middle side portion (38) of the core removal restricting member (4). ) Are projected outward in the bridge width direction with respect to both the die bridge portion (8) and the flow control mold member bridge portion (30).
The mold member bridge for flow control during extrusion (3
The effect of the deflection of 0) is caused by the core removal restricting member (4).
The core removal restricting member (4) is configured to be able to move in the front-rear direction within the range of the spacing distance of the spacing space (35).

The backer (5) is made of die steel, and is combined with the front end of the holding mold member (2).

In the extrusion tool having the above structure, for example, the core (9) is set in a proper assembly state as an extrusion tool and before the core is set to the extruder for some reason such as an impact or a difference in thermal expansion. FIG. 1 shows a case in which the gap is displaced rearward by using the space (35) between the die bridge (8) and the flow control mold member bridge (30). As described above, using the U-shaped tool (43), the both side portions (44) and (44) are inserted from behind the flow control mold member (3) so as to sandwich the bridge portion (30). At both ends, the side protrusions (41) and (41) of the core removal restricting member (4) are pushed, and the core (9) is inserted at the middle side (38) of the core removal restricting member (4). To return to the normal position. Thereby, at the time of extrusion, the core (9) can be returned to an appropriate holding position, and the flat tube material (E) having an appropriate hollow shape can be extruded.

Further, in the process of flowing the extruded material into the extruding tool in the first extrusion, the extruded material automatically pushes the side protruding portions (41) and (41) of the core ejection restricting member (4) to automatically push the extruded material. The core (9) is returned to the normal position. Also, during the extrusion, the extruded material pressure acts on the side protrusions (41) and (41) of the core extraction restricting member (4), and the core (9) ), The undesired rearward displacement operation can be sealed.

FIGS. 7 and 8 show a modification of the core removal restricting structure. Core removal restriction member (4) in this case
Is formed in a plate shape by die steel, and the length thereof is formed to be larger than the width of the bridge portions (8) and (30), and both ends thereof are the widths of the bridge portions (8) and (30). It is made to protrude outward in the direction. In addition, the core removal member (4) has, on both side edges at the center in the length direction,
Outwardly projecting positioning engaging projections (45), (45) are integrally formed. On the other hand, the positioning recess (37) provided on the front end face of the flow control mold member bridge (30)
At the center in the length direction, engaging concave portions (46) and (46) for accommodating the positioning engaging convex portions (45) and (45) of the core removal restricting member (4) are provided. (45) (45)
The engagement of the engaging recesses (46) and (46) allows the core removal control member (4) to be positioned in the width direction of the bridge portions (8) and (30). By adopting the core removal restricting structure employing such a flat structure core removal restricting member (4), the production of the core removal restricting member (4) and the like can be simplified.

[0027]

As described above, according to the configuration of the extrusion tool of the present invention, the core is moved rearward by utilizing the space between the bridge portion of the extrusion die and the bridge portion of the flow control mold member. If it is displaced to the center of the core, for example, the side protruding part of the core removal restricting member protruding laterally from the bridge part of the flow control mold Can be returned to the regular holding position,
After the start of extrusion, the extruded material interferes with the side protrusion of the core extraction restricting member, and the core extraction restriction member holds the core in an appropriate position, and thus has an appropriate hollow portion shape. The hollow extruded material can be reliably extruded.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of an extrusion tool, showing an example, showing an operation example for a core removal restricting member.

FIG. 2 is a sectional view of a main part of the extrusion tool.

FIG. 3 is a sectional view taken along line II-II of FIG. 2;

FIG. 4 is a perspective view showing a die, a core removal restricting member, a flow control member, and the like in a separated state.

FIG. 5 is an overall sectional view of an extrusion tool.

FIG. 6 is a rear end view of the extrusion tool.

7A and 7B show another embodiment, wherein FIG. 7A is a cross-sectional view of a bridge portion, FIG. 7B is a cross-sectional view taken along line VII-VII of FIG. 7A, and FIG. FIG. 8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 8 is a perspective view showing a die, a core removal restricting member, a flow control member, and the like in a separated state.

FIG. 9 is a cross-sectional view of a flat tube material for a heat exchanger to be extruded.

FIG. 10 is a sectional view of a main part of a conventional extrusion tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Die for extrusion 3 ... Die member for flow control 4 ... Core removal restriction member 8 ... Bridge part 9 ... Core 22 ... Core holding hole 30 ... Bridge part 35 ... Spacing space 41 ... Side projection part

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Claims (1)

(57) [Claims] 1. A core holding hole is provided in a bridge portion, and the core is held in the core holding hole such that a hollow molded portion at a tip end thereof is protruded forward so as to be able to be pulled out rearward. An extrusion die and a bridge portion, wherein the bridge portion coincides with or substantially coincides with the bridge portion of the extrusion die, and in a mode in which a predetermined space is provided with respect to the die bridge portion, the extrusion die A flow control mold member disposed adjacent to a rear portion of the die; and a flow control mold member facing the core holding hole between the bridge portion of the extrusion die and the bridge portion of the flow control mold member. The core extraction restricting member is disposed so as to be movable in the front-rear direction, and a part of the core extraction restriction member is configured to protrude laterally from the bridge portion of the flow control mold member. Extrusion of metallic hollow material such as aluminum Extrusion tool for construction.