JP2000094160A - Method for manufacturing hollow material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means to efficiently obtain a high quality hollow material maintaining a shape of butt joint before joining at the time of manufacturing a hollow material equipped with a hollow part by way of combining both of frameworks by friction stirring welding from a pair of long size materials having a U-shaped cross section continuous in the longitudinal direction. SOLUTION: In a hollow part 20 constituted between frameworks 10, 10 disposed to face oppositely a pair of long size materials 1A, 1A, an internal receiving base 5 equipped with a roller 51 rolling contacting the internal surface of the joining side and a roller 52 rolling contacting the opposite internal surface is loaded, and then both the long size materials 1A, 1A are joined and integrated while being relatively moved against a working head 3 with the internal receiving base 5 positioned near an abutted part of the working head 3 for friction stirring welding by a retaining means 6A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow portion formed by joining two U-shaped frame portions which are continuous in the longitudinal direction of a pair of long members and joining the two frame portions together by friction stir welding. And a method for producing a hollow material.

[0002]

2. Description of the Related Art In recent years, friction stir welding (Fri stir welding) has been proposed as a new joining technique that replaces welding and brazing of metal materials.
Ction Stir Welding) method is spreading. As disclosed in Japanese Patent Laid-Open Publication No. Hei 7-505090, this joining method is performed when a probe (rod) made of a material harder than the workpiece is brought into sliding contact with the workpiece while rotating at a high speed. The method utilizes the fact that the workpiece material plastically flows due to the generated frictional heat and pressure, and the probe is embedded in the workpiece and can be moved in the workpiece with the embedded state. is there.

For example, when the probe is moved in the embedded state along the butt joint line between the metal plates, the material of the two metal plates plastically flowing on the front side of the probe is stirred and kneaded on the rear side of the probe. Gradually, and loses the frictional heat on the rear side and rapidly cools and solidifies, so that the two metal plates are joined in a state where the materials are mixed together and completely integrated. In this case, the temperature at which the metal material plastically flows is much lower than the melting point, joining is in the category of solid-phase joining, and the amount of heat input to the metal material throughout the joining process is extremely small compared to welding and brazing, and solidification occurs. Since there is no generation of stress due to shrinkage, there is an advantage that deformation and cracking due to thermal strain in the vicinity of the joint are not likely to occur.

By the way, for example, as shown in FIG. 9 (A), two channel members (1A) (1A) are formed so that U-shaped frame portions (10) (10) face each other, Piece (10
a) The ends of (10b) are butted together, and these butted portions (11) are joined and integrated by the friction stir welding method, respectively, to form a rectangular tube having a hollow portion formed by uniting the frame portions (10) and (10). Is obtained. However, the same figure (B)
As shown in (2), in friction stir welding, welding is performed while pressing the processing head (3) rotating at a high speed against the butting portion (11). Therefore, when there is no support due to the hollow portion (20), butting is performed. The two side pieces (10a) and (10a) are easily bent inward by the pressing load, and the joint wall (20a) is easily deformed so as to be concave, thereby deteriorating the product quality of the hollow material (2) obtained, and in some cases, There has been a problem that poor joining occurs.

In order to prevent the above deformation, it is conceivable to insert an appropriate receiving member into the hollow portion (20). However, since the channel members (1A) and (1A) are long,
Since the joining position by the processing head is relatively moved at a constant speed during the joining process, the channel material (1) is used as a receiving material.
A) It is necessary to insert a material having a length corresponding to the entire length of (1A) and to pull out the material after joining, which is extremely difficult in operation and is not realistic. In addition, such a problem is not limited to the joining of the illustrated channel materials (1A) and (1A), but a U-shaped or U-shaped section that is continuous in the longitudinal direction.
This is a common problem when a pair of long members having a U-shaped frame portion are joined and integrated by friction stir welding to produce a hollow member having a hollow portion formed by combining the two frame portions.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a friction stir welding by abutting a pair of long members having a U-shaped or U-shaped cross section which are continuous in the longitudinal direction.
As a method of manufacturing a hollow material having a hollow portion where both frame portions are united, a simple configuration reliably prevents inward bending of both side pieces where the both frame portions are abutted, so that a dent is formed in a joint wall of the hollow portion. It is another object of the present invention to provide means for efficiently manufacturing a high-quality hollow material in which the shape of the butted portion before joining is maintained.

[0007]

In order to achieve the above object, a method of manufacturing a hollow member according to a first aspect of the present invention is directed to a method of manufacturing a hollow member having a U-shaped or U-shaped cross section which is continuous in a longitudinal direction. A pair of long members having a semicircular frame portion) are arranged such that the frame portions face each other, and the butted portions of both side pieces of these frame portions are integrated by friction stir welding, In manufacturing a hollow member having a hollow portion formed by combining the two frame portions, a roller that rolls into contact with the inner surface on the joining side by friction stir welding in the hollow portion formed between the opposedly arranged frame portions of the pair of long members. And a roller having a roller that rolls on the inner surface opposite to the inner surface is loaded, and while the intermediate receiver is positioned near the contact portion of the friction stir welding processing head by the holding means, Move the material relative to the processing head It is characterized in that if integrated.

In the above construction, even when the processing head presses and abuts the butted portions of the both side portions of the two frame portions in the joining integration of the two long materials by friction stir welding, the inside of the vicinity of the pressed contact portion is the middle support. Since it is supported by the tool, bending of both side pieces inward is suppressed, and no dent is formed in the joint wall. However, in the relative movement with the long material, since the resistance is small due to the rolling of each roller in contact with the inner surface on the opposite side of the joining side, the intermediate receiving member does not perform the relative movement during the friction stir welding. It can be smoothly carried out and can be easily inserted into the hollow space between the two long members before joining.

According to a second aspect of the present invention, in the method for manufacturing a hollow material according to the first aspect, the friction stir welding by the working head is performed at a fixed position while the two long materials are horizontally moved in the longitudinal direction via a feed roller. And fixing the other end of the holding member, one end of which is connected to the middle receiving member, as an holding means to the outside on the upstream side or the downstream side in the moving direction of both long members, so that the middle receiving member is held in contact with the working head. It is located near the contact part. In this case, since the friction stir welding is performed while horizontally moving the two long members with the processing head as a fixed position, the middle receiving member may be set at the fixed position by the holding member. As the holding member, a rod-shaped material such as a pipe or a shaft, or a cable body such as a wire can be used.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. 1 to 3 show a first embodiment, FIG. 4 shows a second embodiment, FIG. 5 shows a third embodiment, FIG. 6 shows a fourth embodiment, and FIG. 7 shows a fifth embodiment.

In FIG. 1 to FIG. 3, (1A) is a long channel material made of an aluminum alloy or the like obtained as an extruded shape, two of which are frame portions (10) ( 10) are placed horizontally on feed rollers (4a) arranged at predetermined intervals on a roller conveyor (4) in a state where the two pieces (10a) and (10b) face each other and face each other. The feed rollers (4a) and the pressing rollers (4b) provided in important places are driven to rotate in one direction at a constant speed. Each pressing roller (4b) is divided into a pair of right and left parts, each of which can move up and down and move in the axial direction, and can adjust the pressing position according to the width of the side of the channel material used.

A processing head (3) for friction stir welding is installed at a fixed position above the roller conveyor (4) at a fixed upper position so as to be movable up and down.
It has a shoulder portion (3b) around the base of a).
The hollow pipe (20) formed between the butted frame portions (10) of the channel materials (1A) and (1A) has a square pipe (5A) as a holding member. (6
It is mounted so as to be located directly below the processing head (3) via A). The roller conveyor (4) is set so that one feed roller (4a) is disposed immediately below the processing head (3).

[0013] The inner support (5A) is a square pipe (6).
A pair of upper and lower rollers (51) and (52) are attached to a frame body (50) fixed to one end of A) by a pivot (53) so as to be freely rotatable, and the upper roller (51) is hollow. The lower roller (52) comes into rolling contact with the upper inner surface of the portion (20), and the lower rollers (52) come into contact with each other. And square pipe (6
The other end side of A) is abutted both channel materials (1A)
(1A) Rolled out from the rear end of the roller conveyor (4)
It is immovably held by a clamp device (7) installed at the rear end of the device through lock bolts (71) and (71).

In the above configuration, both channel materials (1
A) To manufacture a hollow material from (1A), with the processing head (3) at the upper standby position, position the front ends of the two channel materials (1A) (1A) butted immediately below it, and The processing head (3) is lowered while rotating at a high speed and pressed against the butting portion (11) of the side pieces (10a) (10a). As a result, the material of the butting portion (11) plastically flows, and the protruding shaft portion (31) is embedded in the butting portion (11). In this embedded state, the roller conveyor (4) is driven to drive both channel materials. (1A) By feeding (1A) at a constant speed in the direction of the arrow, the material plastically flowed by frictional heat and pressure at the front side of the protruding shaft portion (31) is stirred and kneaded while the protruding shaft portion (21) is It gradually shifts to the rear side, where it loses frictional heat and rapidly cools and solidifies, and the butted side pieces (10a) (10a) are completely joined and integrated. The processing head (3) is set so that the axis thereof is slightly inclined backward in the feed direction downstream of the roller conveyor (4), whereby the material that has plastically flowed is pressed from above by the shoulder portion (32) and the joining surface is pressed. Leveling.

In this friction stir welding, a load is applied to the upper side pieces (10a) (10a) of the two frame parts (10) by pressing the processing head (3) against the butting part (11). However, these side pieces (10a) and (10a) are supported by the middle support (5A) in the hollow part (20) immediately below the pressing position, and the pressing load is reduced by the middle support (5A) and the lower side. Since it is received by the feed roller (5a) of the roller conveyor (4) through the side pieces (10b) and (10b), the side pieces (10a) and (10a) on the joining side are not bent inward but formed. The upper joining wall (21) of the hollow part (20) becomes flat. In addition, both channel materials (1A) (1
When the A) moves, the middle receiving member (5A) at a fixed position includes upper and lower rollers (51) in contact with the upper and lower inner surfaces of the hollow portion (20).
Since (52) rolls spontaneously, the resistance to the middle receiver (5A) is small, and smooth movement can be performed.

Thus, both channel materials (1A) (1A)
Are joined and integrated at the upper butting portion (11), and then placed on the roller conveyor (4) in the same manner as before, with the integrated body turned upside down, and the inside of the hollow portion (20) is received in the hollow portion (20). The tool (5A) is inserted and the side pieces (10b) (10
By joining and joining the butted portions (11) of (b) by friction stir welding, a hollow cylindrical member (2) having a hollow portion (20) formed by combining the two frame portions (10) and (10) is obtained. can get.
This hollow member (2) is connected to the joining walls (2) on both sides of the hollow portion (20).
1) is flat and has high quality.

In the second embodiment shown in FIG. 4, a square pipe (6A) as a holding member in the middle receiving member (5A) is used.
Is fixed to the frame body (50) at one end, and the other end is led out from the front end of both butted channel members (1A) (1A), and is clamped to the clamping device (7) of the roller conveyor (4). Is held. Other configurations are the same as those of the first embodiment shown in FIGS.

In the third embodiment shown in FIG. 5, both channel materials (1A) placed on a roller conveyor (4)
Inside the hollow portion (20) between (1A), a middle receiver (5B) having a different structure is loaded for the same purpose as in the first embodiment. The middle receiving member (5B) includes one upper roller (51) and two lower rollers (52a) (52b) attached to the frame (50).
In the state of rolling contact with the upper and lower inner surfaces of the hollow part (20) with
Since the cable body (6A) itself can maintain a stable posture in the hollow portion (20), the other end of the cable body (6B) such as a wire having one end connected to the frame body (50) is fed with both channel materials (1A) and (1A). It is fixed to the outside on the upstream side in the direction (not shown), and is held at a position immediately below the processing head (3).

In the above-described first to third embodiments, the middle receiving members (5A) and (5B) are set at positions immediately below the processing head (3).
When the protruding shaft portion (3a) of the processing head (3) embedded in the shaft protrudes slightly into the hollow portion (20), the upper roller (51) is used to avoid interference with the protruding shaft portion (3a). ) Is slightly away from the protruding shaft portion (3a), especially in order to avoid contact with the plastically flowing material, the two channel materials (1A) and (1A)
May be set at a position away from the upstream side in the feeding direction. Further, for the purpose of avoiding the above-mentioned interference, an annular concave portion (51a) may be provided at the center of the peripheral surface of the upper roller (51) as in the middle holder (5C) of the fourth embodiment shown in FIG. Good.

The present invention relates to the illustrated channel material (1).
Not limited to A), a hollow material having a hollow portion formed by uniting these frame portions is manufactured from various long materials having a U-shaped or U-shaped frame portion continuous in the longitudinal direction as a raw material. In any case, any of them can be applied.

For example, as shown in FIG. 7, a frame 2 having a semicircular cross section (10) as a U-shaped cross section is provided.
When the extruded long members (1B) and (1B) made of extruded shapes are butted and the butted portions (11) and (11) are sequentially friction stir welded to obtain a hollow material having a circular cross section, the frame ( 1
0) If the same middle receiving member (5D) as described above is located near the contact portion of the processing head (3) in the hollow portion formed in (10), the upper and lower joining walls of the hollow portion do not have dents. It can be arc-shaped.

In this embodiment, the middle receiving member (5
The peripheral surfaces of the upper roller (51) and the lower roller (52) of D)
It is formed in an arc surface corresponding to the inner peripheral arc surface of the hollow material. In addition, the peripheral surfaces of the feed roller (4a) and the pressing roller (4b) are also formed in circular arc surfaces corresponding to the outer peripheral shape of the hollow material.

Further, for example, as shown in FIG. 8A, a pair of hollow extruded members (1C) and (1C) having a U-shaped frame (10) on one side in the width direction is used, and the frame ( 10) (10)
When the side pieces (10a) and (10a) and the side pieces (10b) and (10b) are sequentially friction stir welded to obtain a wide hollow material, the facing pieces (10) and (10) are If the same middle support as described above is located in the vicinity of the contact portion of the processing head in the hollow portion to be formed, the upper and lower joining walls of the hollow portion can be made flat without dents.

A long member having a plurality of frames is combined, and a hollow member is formed by integrating three or more long members in such a manner that a hollow portion is formed at each joint by friction stir welding. It is also possible. Further, as shown in FIG. 8B, for example, long members (1D) and (1D) having different projection lengths (widths) of both side pieces (10a) and (10b) of the frame portion (10) are protruded from each other. The long side piece (10a) and the short side piece (10b) are arranged so as to abut each other, and the butted portion is joined and integrated by friction stir welding to form a hollow section having a rectangular cross section. It is possible. Therefore, even in these friction stir welding, by using the same middle receiving member as described above,
The joining wall can form a flat hollow portion.

In the present invention, various transfer means other than the roller conveyor (4) exemplified for moving the long material in the friction stir welding can be adopted. Then
As the roller conveyor (4), the pressing roller (4
It is also possible to use a roller which is not divided as in the first embodiment as in the case b), and it is also possible to adopt a structure in which a roller which is driven to rotate for movement and a roller which is driven to rotate are appropriately combined. On the other hand, as the middle receiving member, a structure in which a pair of upper and lower rollers are separated from each other, a structure in which two upper rollers are opposite to the third embodiment, a structure in which a plurality of rollers are provided in both upper and lower directions, and the like other than the embodiment. Various structures can be adopted.

[0026]

According to the first aspect of the present invention, a hollow member having a hollow portion formed by combining two U-shaped frame portions by friction stir welding from a pair of long members having a frame portion continuous in the longitudinal direction. In the manufacture of the friction stir welding head, the inner receiving member is arranged inside the vicinity of the abutting portion of the processing head for friction stir welding, so that it is ensured that the opposing side pieces of both frame portions are bent inward by the pressing contact of the processing head. In addition, since the inner receiving member has rollers that are individually rolled on the inner surface on the joining side of the hollow portion and the inner surface opposed thereto, the resistance in the relative movement between the two long members is small, and friction stir welding is performed. The relative movement at the time can be performed smoothly, and the middle receiving member can be easily inserted into the inner space which is the hollow portion of both long members before joining, thereby maintaining the shape of the butted portion before joining, so that high quality. Can be manufactured very efficiently.

According to the second aspect of the present invention, in the above-described method for manufacturing a hollow material, the friction stir welding is performed while the working head and the intermediate support are fixed at a fixed position and the two long materials are horizontally moved by the feed rollers. Therefore, there is an advantage that the structure for holding the intermediate receiving tool in the vicinity of the contact portion of the processing head is simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a first embodiment of a method for manufacturing a hollow material according to the present invention.

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

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a vertical sectional side view of a main part showing a second embodiment of the manufacturing method.

FIG. 5 is a vertical sectional front view of a main part showing a third embodiment of the manufacturing method.

FIG. 6 is a longitudinal sectional side view of a main part showing a fourth embodiment of the manufacturing method.

FIG. 7 is a longitudinal sectional front view of a main part showing a fifth embodiment of the manufacturing method.

FIG. 8 shows another example of a long material to which the present invention is applied;
(A) is a cross-sectional view of a hollow extruded profile, and (B) is a cross-sectional view of a long material in which both side pieces of a frame have different projecting lengths.

9A and 9B are views for explaining a conventional method of manufacturing a hollow material by friction stir welding, in which FIG. 9A is a cross-sectional view of a pair of channel materials to be used, and FIG. It is a longitudinal front view which shows the joining condition of a long material.

[Explanation of symbols]

 1A ... channel material (long material) 1B ... hollow extrusion type material (long material) 1C ... long material 10 ... C-shaped frame portions 10a, 10b side pieces 11 butting portion 2 hollow material 20 hollow portion 3 friction Processing head for stirring and joining 4 Roller conveyor 4a Feeding roller 4b Pressing rollers 5A to 5D Middle receiving tool 51 ... Upper roller 52 ... Lower roller 6A ... Square pipe (holding member) 6B ... Cable (holding member)

Claims (2)

[Claims] 1. A U-shaped or U-shaped section that is continuous in the longitudinal direction.
A pair of long members having a U-shaped frame portion are arranged so that the frame portions face each other, and the butted portions of both side pieces of these frame portions are integrated by friction stir welding, so that In manufacturing a hollow member having a hollow portion formed by uniting, a roller that rolls into contact with an inner surface on the joining side by friction stir welding in a hollow portion formed between opposed frame portions of the pair of long members, and the inner surface And a roller which rolls on the inner surface opposite to the inner surface, is loaded, and while the intermediate receiver is positioned near a contact portion of the processing head for friction stir welding by holding means, both long members are subjected to the processing. A method for manufacturing a hollow material, wherein the hollow material is integrated by being moved relative to a head. 2. A holding member having friction stir welding by the processing head at a fixed position while horizontally moving both long members in a longitudinal direction via a feed roller, and a holding member having one end connected to a middle receiving member as holding means. 2. The method of manufacturing a hollow member according to claim 1, wherein the other end of the hollow member is fixed to the outside on the upstream side or the downstream side in the moving direction of the two long members, so that the intermediate receiving member is located near the contact portion of the processing head.