JP2001071025A - Hollow shape material extrusion die and thin thickness hollow shape material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow shape material extrusion die capable of forming a thin hollow shape material a welded member made of a material hard to extrude like an aluminum alloy, etc., by a reduced number of correcting bearing parts and its thin thickness hollow shape material. SOLUTION: A welded material is branched by plural entry ports 7a, 7b and is passed through these entry ports 7a, 7b, is joined/welded and then is formed into a thin thickness hollow shape material 9 by extruding from a die hole. The entry ports 7a, 7b are respectively set in conforming to each passing volume rate corresponding to a volume distribution between the welded parts 9a, 9b of the thin thickness hollow shape material 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow material extrusion die for extruding a welding material, particularly a material made of aluminum or an aluminum alloy from a die hole to form a hollow material, and a thin hollow material thereof.

[0002]

2. Description of the Related Art In extrusion molding, a billet made of an extruded material such as metal or non-metal is stored in a container, and then pressed in the direction of an extrusion die provided in the container to split the billet at an entry port of the extrusion die. While extruding, the extruded material is pressed into an extrusion die. Then, after these extruded materials are joined again in the chamber portion in the extrusion die,
By extruding through a die hole of a bearing portion, hollow sections having various cross-sectional shapes are integrally and continuously formed.

[0003] At this time, if the relationship between the entry port portion, the chamber portion, and the bearing portion of the extrusion die is inappropriate, even if the shape of the die hole of the bearing portion is formed corresponding to a desired sectional shape, The cross-sectional shape of the hollow profile is distorted or the extrusion is warped. Therefore, conventionally, an extrusion die is empirically designed and manufactured so that each part has an optimal relationship based on the cross-sectional shape of the hollow profile, and then the hollow profile is formed using the extrusion die. . The extrusion die is completed by repeating the operation of correcting the bearing portion based on the state of the hollow shape member, forming the hollow shape member again with the corrected extrusion die, and correcting the bearing portion.

[0004]

However, as described in the prior art, after each part of the extrusion die is empirically designed and manufactured, the extrusion die is subjected to trial and error by repeating molding of the hollow material and modification of the bearing part. In order to extrude the welding member and form a thin hollow profile, a lot of trial and error is required until a final extrusion die is obtained. Furthermore, depending on the design of the extrusion die, the starting point of trial and error may deviate significantly.In this case, even if the correction is repeated, the desired thin hollow member of the welded member cannot be obtained. It may be necessary to redesign the dice. Particularly, in the case of a hardly extruded material having high deformability in extrusion, such a problem frequently occurs.

As described above, the conventional method has a problem that a lot of trial and error and redesign are required until the extrusion die is completed, thereby increasing the production cost and the production lead time. In addition, in the extrusion die completed by the conventional method, the extrusion material in the extrusion die is forcibly corrected to obtain a hollow shape having a desired cross-sectional shape. There is also a problem that molding is difficult.

Accordingly, the present invention is directed to a hollow material extrusion die capable of forming a thin hollow material with high quality and high precision even for a welded member made of a hardly extruded material by modifying the bearing portion a small number of times. And a thin hollow member thereof.

[0007]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a welding material is divided at a plurality of entry ports, and is joined and welded through these entry ports. A hollow profile extrusion die for extruding a thin hollow profile later by extruding from a die hole, wherein the entry ports are respectively set so as to have a passing flow rate corresponding to a volume distribution between welding portions of the thin hollow profile. It is a hollow material extrusion die. According to the above configuration, since the passing flow rate of each entry port is set so as to correspond to the volume distribution between the welded portions, the extruded material that has joined and welded after being split at the entry port has an unreasonable twist. It flows without being accompanied and is extruded out of a die hole one by one. Therefore,
Even when forming a thin hollow profile using a welding material made of a difficult-to-extrud material, a thin hollow profile having high dimensional accuracy and extrusion linearity can be obtained.

According to a second aspect of the present invention, the welding material is divided at a plurality of entry ports set in accordance with the volume distribution between the welding portions, passed through these entry ports to be joined and welded, and then from the die hole. It is a thin-walled hollow material characterized by being extruded into a thin-walled hollow shape. The flow rate of each entry port is set to correspond to the volume distribution between the welded parts.Because it is merged and welded after being split at the entry port, even if it is a difficult-to-extruded material, a thin hollow material However, the welded portion is not twisted, and is a thin hollow member having a uniform thickness.

According to a third aspect of the present invention, there is provided the thin hollow member according to the second aspect, wherein the thin hollow member has a thickness of 3.0 m.
It is a thin-walled hollow material having a range of m to 0.3 mm. The thickness of the thin hollow profile is 3.0mm ~
It is preferably in the range of 0.3 mm, especially in the range of 1.5 mm to 0.5 mm. If it is less than 0.3 mm, the material is no longer extruded except for the extrusion of small profiles, and if it is more than 3.0 mm, it is recognized as a normal wall thickness.

According to a fourth aspect of the present invention, the welding material for the thin hollow member is made of aluminum and an aluminum alloy.
4. A non-extrudable material comprising A6N01, A6061, A7N01, and A7075.
It is a thin-walled hollow profile as described.

According to a fifth aspect of the present invention, in any one of the second to fourth aspects, the cross-sectional shape of the thin hollow member is a non-regular polygon having at least one side having a size different from that of the other side. Or a thin hollow member according to item 1.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The hollow profile extrusion die according to the present embodiment is detachably provided in an extrusion molding machine. The extruder, as shown in FIG.
Cylindrical container 1 having an accommodating portion 1a for accommodating
And a rod-shaped extruder 2 provided so as to be able to move forward and backward with respect to the accommodating portion 1a of the container 1; and the billet 6 in the container 1 is pressed with a predetermined pressing force in the arrow direction while moving the pusher 2 forward and backward. And a pressurizing device 3. The billet 6 is made of an aluminum alloy, for example, A6N01, A6
It is formed by forming a hardly extrudable material such as 061, A7N01, A7075, etc. into a cylindrical shape.

The container 1 is provided at the tip end surface of the container 1 described above.
The die holder 4 is provided so as to surround the opening a. The die holder 4 is formed with a holding portion 4a communicating with both end surfaces, and a hollow hole extrusion die 5 of a porthole die type is fitted into the holding portion 4a. The hollow material extrusion die 5 has a male mold 7 and a female mold 8 in this order from the billet 6 side. As shown in FIG. 1, the male mold 7 has a plurality of entry ports 7a and 7b on the outer periphery. These entry ports 7a are communicated from one surface on the billet 6 side to the other surface on the female die 8 side, and the extruded material is introduced into the female die 8 by diverting the billet 6 at a passage amount corresponding to the opening area. I do. Further, the male mold 7 has a male bearing 7c protruding in the female mold 8 direction. The male bearing 7c is arranged at the center of the other surface of the male die 7, and has an end surface formed in a rectangular shape.

The specifications of the entry ports 7a and 7b (portion of gravity, opening area, etc.) are determined so as to correspond to the volume distribution between the welded portions 9a and 9a of the hollow profile 9. Specifically, each entry port 7a
7b so that the flow rate ratio of the extruded material at 7b coincides with the volume distribution ratio between the welded portions 9a of the hollow shape member 9.
The port specifications (the position of the center of gravity, the opening area, etc.) of the entry ports 7a and 7b are determined. The volume distribution is an individual volume between the welded portions 9a. The volume distribution ratio is a ratio of the individual volume between the welded portions 9a to the total volume per unit length of the hollow shape member 9.
The passage flow ratio is a ratio of the individual flow rate passing through each entry port 7a to the total flow rate passing through all entry ports 7a.

The male mold 7 is detachably fitted to one side of the female mold 8 in a detachable manner. The female mold 8 communicates with the entry ports 7a and 7b of the male mold 7, and the entry ports 7a and 7b.
A chamber 8a for joining the extruded material of the billet 6 diverted by 7b, and a female bearing 8b formed at the center of the other surface so as to position the male bearing 7c on the inner peripheral side. ing. Female bearing 8b
Are formed so as to have an opening shape slightly larger than the end face shape of the male side bearing 7c, and these bearings 7c and 8b have a rectangular shape corresponding to the cross-sectional shape of the hollow shape member 9 due to a gap between them. Are formed. And, the die hole 10 has the entry port 7a.
A hollow section 9 having a rectangular section is formed having, as a welding portion 9a, a portion where the extruded materials separated and joined at 7b are welded together.

A description will be given of a method of setting the entry ports 7a and 7b so as to provide a passage flow rate corresponding to the volume distribution between the welding portions of the hollow material extrusion die in the above configuration, and the operation thereof.

First, as shown in FIG. 3, the position of the welded portion 9a is determined based on the cross-sectional shape of the hollow member 9. That is,
When the hollow profile 9 having a rectangular cross section is formed, when the hollow profile 9 is subjected to various surface treatments, the welded portion 9a has a surface state such as gloss or color different from other portions. The corner is determined as the position of the welded portion 9a so that this surface state is located at the least noticeable portion. After this,
While calculating the total volume per unit length of the hollow shape member 9, the individual volumes between the welded portions 9a are calculated,
By calculating the ratio of each individual volume to the total volume, the volume distribution ratio Vi between the welded portions 9a is obtained.

Next, as shown in FIG. 2, the port specifications of the entry ports 7a and 7b are set as design feature values of the opening area, perimeter, depth and center position. The opening area is Si, the circumference is Li, the depth is Hi, and the center position with respect to the die center O is ri. "I" is a variable for specifying each entry port 7a, 7b. If there are four entry ports 7a, 7b, the variable i =
1 to 4. Then, these design feature values Si · Li
By using Hi · ri to derive and combine a position flow velocity ratio function f (ri), a shape flow velocity ratio function g (Si, Li, Hi), and a dimensional flow velocity ratio function h (Si, Hi), Flow rate ratio X of entry ports 7a and 7b
Let i be a relational expression (1) indicating i.

Xi = f (ri) · g (Si, Li, Hi) · h (Si, Hi) (1)

Thereafter, the arbitrary design feature value S
The passage flow ratio Xi is obtained by substituting i · Li · Hi · ri, and this passage flow ratio Xi is compared with the above-mentioned volume distribution ratio Vi. If the two ratios Xi and Vi do not match, the specific or all of the design characteristic values Si, Li, Hi, and ri are changed, a new flow rate ratio Xi is obtained, and is compared with the volume distribution ratio Vi. Then, such design feature values Si · Li ·
The Hi-ri change process and the comparison process are programmed, executed by an information processing apparatus such as a personal computer, and repeated to design the design characteristic value Si, Li, Hi, and the passage flow ratio Xi that matches the volume distribution ratio Vi. r
Find i.

As described above, the design feature value Si · Li ·
When Hi · ri is obtained, as shown in FIG. 1, the male mold 7 having the entry ports 7a and 7b of the port specification including the design characteristic values Si · Li · Hi · ri is manufactured. Further, a male bearing 7b of the male die 7 and a female bearing 8b of the female die 8 are formed so as to form a die hole 10 corresponding to the cross-sectional shape of the hollow member 9. Then, the hollow die extrusion die 5 is assembled by closely fitting the male mold 7 to the female mold 8.

Next, as shown in FIG. 4, the hollow profile extrusion die 5 is mounted on the holding portion 4a of the die holder 4. After that, the container 1a of the container 1 is opened by retracting the pressurizing device 3, and the billet 6 made of the extruded material is inserted into the container 1a and heated to the extrusion temperature. Thereafter, the billet 6 is pressed through the extruder 2 by causing the pressing device 3 to advance at a constant speed in the arrow direction. As shown in FIG. 1, the billet 6 has an end face pressed against one surface of the male mold 7 so that the extruded material constituting the billet 6 is diverted to the entry ports 7a and 7b of the male mold 7 while the female mold 8 is diverted. Flow in the direction. Each entry port 7
The extruded materials a and 7b are joined and welded in the chamber 8a of the female die 8 after passing through the entry port 7a.

The combined extruded material is supplied to the male bearing 7b.
And is pushed out through a die hole 10 formed by a gap between the female bearing 8b. At this time, the flow rate ratio of the passing through each entry port 7a, 7b is changed to the welding portion 9a, 9a.
The extruded material that has been joined and welded in the chamber 8a flows into the die hole 10 without excessive twisting, and is set to match the volume distribution ratio (passing flow ratio) between the die holes 10. Extruded sequentially. Therefore, the hollow member 9 extruded from the die hole 10 is welded to the welding portion 9a at the corner portion determined in advance as the welding position.
And high dimensional accuracy and extrusion linearity. Thereby, even if it is an aluminum alloy, such as A6N01, A6061, A7N01, and A7075, which is difficult to extrude, the thickness is 1.5 mm or more.
The thin hollow member 9 having a thickness of 0.5 mm, more preferably 3.0 mm to 0.3 mm can be obtained. The thickness of 3.0 mm to 1.5 mm can be managed by the conventional method in some cases, but twisting or the like often occurs. However, according to the method of the present invention, it is possible to manufacture the thin hollow member 9 in the above-mentioned thickness range without such a problem. Since the male side bearing 7b and the female side bearing 8b are modified based on the thin hollow member 9 having such good quality, a very high quality can be achieved with a small number of modifications (trial and error). The hollow material extrusion die 5 capable of forming the thin hollow material 9 can be obtained.

In this embodiment, the hollow hole extruding die 5 of the porthole die type and the thin hollow member made of the hardly extrudable material are described. 5 and a thin hollow member made of a hardly extruded material thereby can be applied to a bridge die system and a spider die system.

Further, the hollow material extrusion die 5 of the present embodiment is used.
The thin hollow member made of a difficult-to-extrude material has been described in the case where the cross section of the thin hollow member 9 is rectangular. However, the present invention is not limited to this. The present invention is applied to a thin hollow member 9 having a non-regular polygonal cross section having at least one side different from other sides, including a polygonal shape such as a rectangular shape, a triangular shape, a pentagonal shape, a circular shape, an elliptical shape, and the like. be able to. Further, the present invention can be applied to a thin hollow member 9 having a multiple structure such as double or triple. Further, the present invention can be applied to a case where hollow sections 9 having various cross-sectional shapes are formed in parallel.

[0026]

The present invention will be described below in detail with reference to examples. Use A6N01 as the extruded material, 50mm x 4
The volume distribution ratio between the welded portions was calculated so as to be a rectangular hollow shape having a thickness of 0 mm and a thickness of 0.3 mm. Next, by using an information processing device such as a personal computer, an arbitrary design feature value was input and repeatedly calculated until the flow rate ratio of the extruded material passing through each entry port and the above-mentioned volume distribution ratio became equal. . As a result, a die having an entry port with a passage flow rate equal to the volume distribution ratio between the welded portions of the thin hollow profile was manufactured. When an extruded shape was formed using the die obtained in this manner, A6N01, which is a difficult-to-extrude material, which was difficult with a die that formed an extruded material by repeating conventional trial and error, was excellent. It has become possible to obtain a thin hollow profile having a thickness of 0.3 mm and having linearity. In addition, A6
Also when 061, A7N01 or A7075 is used as an extruded material, a thin hollow profile having a thickness of 0.3 mm can be obtained.

[0027]

The present invention is configured as described above.
According to the present invention, since the passage flow rate of each entry port is set to correspond to the volume distribution between the welding portions,
The extruded material that has been merged and welded after being separated at the entry port is extruded from the die hole evenly and sequentially without excessive twisting. Therefore, A6N01, A60
Even if it is a difficult extruded material such as an aluminum alloy such as 61, A7N01, and A7075, a hollow shape material formed by extruding a die hole has a thin thickness of 3.0 mm to 0.3 mm and high dimensional accuracy. And extrusion linearity. Since the die hole is corrected based on the thin-walled hollow material of good quality as described above, even if the material is difficult to extrude with a small number of corrections (trial and error), extremely high quality is obtained. There is an effect that a thin hollow profile can be formed with high precision.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a hollow profile is formed by a hollow profile extrusion die.

FIG. 2 is an explanatory diagram showing a state of an entry port.

FIG. 3 is a perspective view of a main part of a hollow profile.

FIG. 4 is an explanatory diagram showing an operation state of the extrusion molding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Extrusion tool 3 Pressurizing device 4 Die holder 5 Hollow shape extrusion die 6 Billet 7 Male type 7a Entry port 7b Entry port 7c Male bearing 8 Female type 8a Chamber 8b Female side bearing 9 Hollow shape material 9a Welding part 10 Dice hole

Claims (5)

[Claims] 1. A hollow material extrusion die for dividing a welding material at a plurality of entry ports, passing through these entry ports, merging and welding, and then extruding from a die hole to form a thin hollow shape material, A hollow material extrusion die, wherein the entry ports are respectively set so as to have a passing flow rate corresponding to a volume distribution between weld portions of the thin hollow material. 2. A welding material is divided at a plurality of entry ports set in accordance with the volume distribution between the welding portions, passed through these entry ports, merged and welded, and then extruded from a die hole into a thin hollow shape. A thin hollow shaped member characterized by being formed by molding. 3. A thickness of the thin hollow profile is 3.0 mm.
The thin-walled hollow member according to claim 2, wherein the thickness is in a range of 0.3 mm to 0.3 mm. 4. The welding material for the thin hollow member is aluminum or an aluminum alloy, particularly A6N01, A6.
The thin hollow-shaped material according to claim 2 or 3, wherein the material is a difficult-to-extruded material consisting of 061, A7N01, and A7075. 5. The thin wall according to claim 2, wherein a cross-sectional shape of the thin hollow member is a polygon having at least one side having a size different from that of the other side. Hollow profiles.