JPS5856657B2 - extrusion die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die for hollow extrusion molding, and more specifically,
The present invention relates to a die suitable for molding an extrusion material having a plurality of hollow parts mainly from a G metal material such as an aluminum alloy or a plastic material such as a synthetic resin.

BACKGROUND ART Conventionally, dies called porthole dies, bridge dies, or spider dies have been known as dies for forming extrusion materials having hollow portions.

This type of die supports a die for defining the outer peripheral shape of the extruded material, and a mandrel that is placed closer to the workpiece than this die and for defining the inner peripheral shape of each hollow part of the extruded material. Support members (e.g. ports, bridges).

Spider) is configured as a combination with υ.

In particular, in the conventional structure, even when molding an extruded material having a plurality of hollow parts, all the mandrels defining the inner peripheral shape of these parts are supported by a single support member.

According to a die with such a conventional structure, in order to form an extruded material with many hollow parts, the number of mandrels is correspondingly large, and the shape becomes complicated if these mandrels are integrally formed with a supporting member. It becomes extremely difficult.

For this reason, it has been considered to process the mandrel as a separate member and fix this mandrel to the support member by means such as screwing, but if the cross-sectional shape of the hollow part is not circular, the rotation angle position cannot be accurately adjusted. This is also extremely difficult.

Also, when the material to be extruded is extruded with these dies, the material to be extruded is once divided into an appropriate number of parts by the support member,
After that, they are combined in a welding chamber and then extruded through a forming hole defined by a die and a mandrel.

Depending on the cross-sectional shape of the extruded material, particularly the shape of the hollow portion and the number of hollow portions, the flow of the extruded material within the forming hole is likely to be inhibited by the mandrel.

Therefore, in order to obtain a good extruded mold material, that is, to obtain a good flow of the material to be extruded, it is very difficult to design the die and set extrusion conditions such as extrusion speed.

The purpose of the present invention is to overcome these conventional drawbacks.

It is an object of the present invention to provide a die for forming an extrusion material that can easily extrude an extrusion material having a plurality of hollow parts.

To this end, the present invention is characterized in that each mandrel is supported by a plurality of support members, which facilitates the processing of the mandrels and support members and improves the flow of the material to be extruded. This also facilitates die design and improves extrusion conditions.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In this embodiment, a die for manufacturing an extruded material 1 made of aluminum alloy and having a cross-sectional shape as shown in FIG. 1 and used as a pipe for a heat exchanger is used. Explain as a dice.

It is considered impossible to extrude the extruded molded material 1 having a large number of hollow parts 2 therein using conventional techniques.

According to the characteristics of the present invention, the hollow portion 2 of the extruded material 1 is herein separated from the hollow portion 2a of the first group located in the area not shaded in FIG. The hollow part 2b of the second group is divided into two groups.
The mandrel that defines the hollow part 2a of the group is the first support member (here, the first port), and the mandrel that defines the hollow part 2b of the second group is the second support member (here, the second port) K. It is integrally formed and supported.

That is, as shown in FIG. 3, this porthole type die is constructed as a combination of a first port 3, a second port 4, and a die 5, and is supported by a bolster 6.

Here, the die 5 has a die bearing 5a that defines the outer peripheral shape of the extruded material 1 as is well known, and a first group of mandrels 7 and a first group of mandrels 7 and A second group of mandrels 8 supported by 2-port 4 is extended.

A molded hole 9 is formed in cooperation with these die bearings 5a.

As shown in FIG. 4, the first port 3 has a circular outer periphery and has two types of port holes 10a and 10b, four each, which are alternately formed at equal intervals in the circumferential direction. 10a and 10b extend in the axial direction as shown in FIG.

That is, the material to be extruded is divided by the first port 3 into eight flows passing through the portholes 10a and 10b.

As shown in FIGS. 5 and 6, a first group of mandrels 7 are integrally formed in the first port 3 at the positions indicated by dotted lines in FIG. It is dimensioned to extend at a predetermined position within the die bearing 5a.

Further, in the first port 3, a recess 11 is formed between the outer eight mandrels 7 and the inner four mandrels 7, so that when combined with the second port 4, the second group The mandrels 8 are housed in the recess 11, and the volume is such that the material to be extruded can reliably flow around the mandrels 8.

Furthermore, a recess 12 is formed between the four mandrels 7 inside the first port 3 for guiding the material to be extruded from the port hole 10a.

The second port 4 has a circular outer periphery as shown in FIG. 7, and has four port holes 13 formed at equal intervals in the circumferential direction.
It has a central port hole 14, and these port holes 13 and 14 are connected to the second port hole 14 as shown in FIG.
It extends in the axial direction of the port 4.

Here, when the portholes 13 and 14 are combined with the first port 3, the portholes 13 and 14 have sandalwood S that overlaps with the portholes 10a and 10b as shown by diagonal lines in FIG.
The extruded material flows through the port holes 10a and 10b of the first port 3, and the port hole 10 enters the port hole 14.
a and the recess 12, and the outer mandrel 7 of the first port 3 is inserted through the port hole 13, and the inner mandrel 7 is inserted through the port hole 14, respectively. being done.

In addition, the end surface of the second port 4 on the first port side, that is, the front end surface, has a structure so that the extruded material that has passed through the first port 3 smoothly merges and flows into the port holes 13 and 14 of the second port 4. A recess 15 is formed.

As shown in FIGS. 8 and 9, a second group of mandrels 8 are integrally formed in the second port 4 at the positions indicated by dotted lines in FIG. It is dimensioned so that it extends at a predetermined position within the die bearing 5a.

A welding chamber 17 is formed in the partition wall 161C separating the porthole 13 at the rear of the second port 4, so that the material to be extruded flows into the die bearing 5a of the die 5 as a continuous flow in the circumferential direction. It has become.

There was more.

A passage space 18 is formed between the mandrels 18.

According to the porthole type die constructed in this way, the first port 3. 2nd port 4
and a die 5 are combined, and the outer peripheral shape is defined by the die bearing 5a of the die 5 by extruding the material to be extruded from the left side to the right side in FIG. 3 while supported by a bolster 6, and a mandrel 7. 8! D: The extruded material 1 with a defined hollow portion is extruded.

At this time, the material to be extruded is first divided by the first port 3 into eight streams passing through the portholes 10a and 10b, and then flows into the portholes 13 and 14 formed in the second port.

At this time, the material to be extruded once smoothly merges due to the presence of the recess 15, and is further divided into the portholes 13 and 14.

The thus divided extruded material is guided to the forming hole 9 by the welding chamber 17 formed at the rear of the second port 4 in a continuous flow in the circumferential direction.

Due to this flow of the material to be extruded, the periphery of the mandrel 7 inserted through the porthole 13 of the second port 4 is reliably filled with the material to be extruded, and the periphery of the mandrel 7 inserted through the porthole 14 is also filled with the material to be extruded. Also, the material to be extruded is filled reliably.

Furthermore, since a passage space 18 is formed between the mandrels 8 of the second port 4 as shown in FIG.
The material to be extruded can communicate between the portholes 13 and 140 through this passage space 18 at a position upstream of the die 5, and as a result, the periphery of the mandrel 8 is also reliably filled with the material to be extruded.

Therefore, the space within the molding hole 9 is reliably filled with the extruded material.

In the above explanation, the extruded material 1 having a large number of hollow parts has been described, but two hollow parts 22a as shown in FIG.
, 22b, the present invention can also be applied to the molding of the extruded mold material 21 having a cross-sectional shape, in which case two supporting members support the mandrels forming the respective hollow portions 22a, 22b.

# Extrude the molded material 2 using a porthole type die as shown above.
1, a mandrel forming the hollow portion 22a may be provided at the first port, and a mandrel forming the hollow portion 22b may be provided at the second port.

As explained above, in the present invention, the mandrels that define the hollow part of the extruded material are supported by a plurality of supporting members, so that the supporting members themselves can be easily processed, and the flow of the extruded material can be smoothly formed. It is easy to flow into the holes, which significantly reduces die manufacturing costs, and also enables extrusion molding of extruded materials having a large number of hollow parts.

Furthermore, since it is easy to design the extruded material to flow smoothly, the acting force applied to the mandrel is reduced, and for example, even with a thin mandrel, it is possible to easily prevent deflection.

This makes it possible to extrude workpieces with intricately thinner hollow parts! It is also possible to extrude a cross-sectional shape as shown in FIG. 11, which was conventionally considered impossible to extrude.

Although the present invention has been described as a porthole-type die, it is not limited to this, and can be similarly applied to spider dies, bridge dies, and the like.

Further, the present invention is not limited to the extrusion mold material as described above, but can be similarly applied to dies for molding extrusion mold materials having any cross-sectional shape.

Furthermore, many changes have been made to the above-mentioned embodiment, such as forming the recess 15 on the rear end surface of the first port and replacing the welding chamber 11 with four parts at the front end of the die 5. Alternatively, many modifications can be made, such as machining the mandrel separately and screwing it into the port.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an extruded molded material molded with a die according to an embodiment of the present invention, Fig. 2 is a cross-sectional view showing a state in which the hollow part of the extruded molded material is divided into groups, and Fig. 3 is a cross-sectional view of an extruded molded material to which the present invention is applied. 1 is a cross-sectional view of the die for forming a porthole in an assembled state, where the first port and the second port are taken along line A-A in FIG. 4 and FIG. 1, respectively; , FIG. 4 is a partial front view of the first port, FIG. 5 is a sectional view taken along line A-A in FIG. 4, and FIG. 6 is a cross-sectional view taken along line B-- in FIG. 4.
FIG. 7 is a partial cross-sectional view of the second port along line B, FIG. 8 is a cross-sectional view along line A-A in FIG. 7, and FIG. A cross-sectional view along B-H, Figure 10 is the first
FIG. 11 is a schematic diagram showing the assembly positional relationship of the respective port holes of the port and the second port, and FIG. 11 is a sectional view showing another example of an extruded molded material. 1...Extruded mold material, 2...Hollow part, 2a
...Hollow part of the first group, 2b...
Hollow portion of second group, 3...first support member, i.e., first port, 4...second support member, i.e., second port, 5...gui, 5a.・・・・・・
Die bearing, 6... Polsturf...
. . . First group mandrel, 8 . . . Second group mandrel, 9 . . . Molding hole, 10a. 10b...porthole of first port, 11,
12... Concave portion, 13, 14... Port hole of second port, 15... Concave portion, 16...
...Partition wall, 17...Welding chamber 18...Passway space.

Claims (1)

[Scope of Claims] 1. A die for forming an extruded material having a plurality of hollow parts from a material to be extruded, the die defining the outer circumferential shape of the material to be extruded, and a die for forming an extruded material having a plurality of hollow parts from a material to be extruded. 1. A die for extrusion molding, comprising a mandrel support member, and each mandrel support member supports a mandrel that defines the shape of a hollow part of an extrusion molding material. 2. The extrusion molding die according to claim 1, wherein each mandrel is integrally processed with a support member that supports the mandrel. 3. The extrusion molding die according to claim 1, wherein a part or all of each mandrel is processed separately and fixed to a support member. 4 A porthole-type die, in which each mandrel is supported by a plurality of ports, and a mandrel supported by a port located at an upstream position of the flow of the extruded material is located at a downstream position. The extrusion molding die according to any one of claims 1 to 3, wherein the extrusion molding die is inserted through a porthole and extends to the inner space of the die bearing.