JPH10252720A - Connecting method for members together - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrally connect a pipe member and a sleeve member firmly in strength by pressing the step face of the sleeve member coupled with the pipe member to the end face of the pipe member and applying electromagnetic molding in the tube shrinking direction from the outer peripheral side of the pipe member. SOLUTION: A bolt 4 is inserted into the through hole 9 of a sleeve member 3 from the end section of a circular coupling section 10 side, and a ring 5 is fixed by a pin 6 on the tip side of the bolt 4 protruded from the other end section of the sleeve member 3. The circular coupling section 10 of the sleeve member 3 is inserted into the end section of the pipe member 2. Electromagnetic molding is applied in the tube shrinking direction from the outer peripheral side of the pipe member 2 while the step face 12 of the sleeve member 3 is pressed to the end face of the pipe member 2. An electromagnetic molding coil for tube shrinking is used for electromagnetic molding, the force in the tube shrinking direction is applied to the end section peripheral wall of the pipe member 2 via the magnetic repulsion between a magnetic flux concentrating unit 15 and the end section peripheral wall of the pipe member 2 when a momentary large current is applied, the pipe member 2 is plastically deformed and protruded into the circular groove 11 of circular coupling section 10 of the sleeve member 3, and they are integrally connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining members used for manufacturing a truss material in a truss structure made of metal such as aluminum.

[0002]

2. Description of the Related Art For example, as shown in FIG. 4, a truss material (51) and a connection screw hole (52a) are used as a truss structure employed in a building structure such as a physical education facility, a commercial facility, and a cultural facility. There is known a type in which a planar or three-dimensional truss structure is formed by jointing with a glove (52).

In this truss structure, a truss material (51)
A circular pipe member (53) of a predetermined length made of stainless steel, and a sleeve member (54) also made of stainless steel joined and integrated by welding (W) to an end of the pipe member (53). The sleeve material (54) has through holes (54a
), The bolt (55), the head of the sleeve material (54)
The bolt (55) is passed through the outer end of the bolt (55) with the pin (57) at the outer end of the bolt (55). ) And are attached so as to be able to rotate together.

[0004] The joint between the truss member (51) and the glove (52) is formed by rotating the tip screw of a bolt (55) projecting outward from the washer (56) by rotating the washer (56). By rotating (55), it is screwed into the screw hole (52a) of the glove (52).

[0005]

However, in the truss material (51) as described above, for example, the pipe material (53)
In the structure in which the sleeve material (54) and the sleeve material (54) are joined together by welding (W) as described above, the strength of the pipe material (53) or the sleeve material (54) as the base material decreases due to the thermal effect of the welding. May occur.

[0006] In particular, when aluminum material is used for the pipe material (53) and the sleeve material (54) for weight reduction, especially for securing the maximum strength, A6061-T
In the case where a heat-treated aluminum alloy material such as six materials is used, there is a concern that the strength of the pipe material (53) or the sleeve material (54), which is the base material, is reduced by welding (for example, TIG, MIG, etc.).

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention provides a method for joining members such as a sleeve member and the like which can be strongly and firmly joined to an end of a pipe member. It is an object to provide a method.

[0008]

An object of the present invention is to provide a joining method for joining a second member to an end portion of a metal pipe material, wherein the second member is provided inside the end portion of the pipe material. A fitting portion that fits snugly is provided, an annular groove extending in the circumferential direction is provided on an outer peripheral surface of an intermediate portion in the axial direction of the fitting portion, and a radially outward portion is provided at a base end portion of the fitting portion. The fitting portion of the second member is fitted inside the end of the pipe material, and then the step surface of the second member is pressed against the end surface of the pipe material. By performing electromagnetic forming in the direction of contraction from the outer peripheral side of the end of the pipe member, the peripheral wall of the end portion of the pipe member is caused to protrude into the annular groove of the fitting portion of the second member by plastic deformation. The problem is solved by a method for joining members, which is characterized in that the members and the members are integrated.

That is, in the above joining method, a fitting portion is provided as the second member to be joined to the end portion of the metal pipe material, and the fitting portion is fitted inside the end portion of the pipe material. An annular groove extending in the circumferential direction is provided on the outer peripheral surface of the intermediate portion in the axial direction, and the fitting portion of the second member is fitted inside the end of the pipe material, and then the end of the pipe material By performing electromagnetic forming in the contraction direction from the outer peripheral side, the end peripheral wall of the pipe material is projected into the annular groove of the fitting portion of the second member by plastic deformation, and the pipe material and the second member are integrally joined. It becomes something. Therefore, the base material strength does not decrease due to the influence of heat as in the case of welding in the joint region, and a strong and strong joint is formed.

Further, the end peripheral wall of the pipe material is plastically deformed into an annular groove extending in the circumferential direction on the outer peripheral surface of the fitting portion of the second member in the axially intermediate portion, and is joined and integrated. Because of this, the joint strength between the annular groove and the peripheral wall of the pipe end particularly increases the joining strength in the axial direction of the pipe.

The second member is provided with a step surface protruding outward in the radial direction at the base end of the fitting portion. In the electromagnetic molding, the step surface of the second member is formed of a pipe material. It is to be performed while pressing against the end face. Therefore, the relative positional relationship between the pipe member and the second member during electromagnetic forming is fixed at a predetermined positional relationship, and the positioning of the second member with respect to the pipe member is facilitated. In addition, during the electromagnetic forming, a load in the axial direction acts on the end of the pipe material by the above-described pressing action, and therefore, the peripheral wall of the end of the pipe material protruding into the annular groove of the fitting portion of the second member. Does not become thinner,
A strong and firm joint is formed. Further, when the end peripheral wall of the pipe member is projected into the annular groove of the second member circular fitting portion by the pressing action, the end surface of the pipe separates from the step surface of the fitting portion of the second member. Both members are joined and integrated in a good appearance without forming a gap.

Further, in the above invention, the second member is made of a sleeve material having a through hole in the axial center portion, and a bolt is inserted into the through hole of the sleeve material so that the head thereof has an inner end surface side of the circular fitting portion. , And the tip is projected from the other end of the sleeve material and inserted. In other words, in the case where the sleeve material and the pipe material must be joined while the bolt is inserted into the sleeve material, for example, in the case of a truss material, there is a risk that the bolt may be affected by heat during welding. , Its strength may be reduced. However, the adoption of a joining method that does not exert a thermal influence as in the case of welding as in the present invention also prevents the strength of the bolt from being reduced.

[0013]

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

In the embodiment, a truss member in a truss structure will be described with reference to FIG. 2, which is applied to a joint between a pipe member (2) and a sleeve member (3). That is, the sleeve member (3) is the second member of the present invention.

In the truss material (1), (4) is a bolt, (5) is a washer, and (6) is a pin.
(7) is a glove, and (7a) ... are the screw holes. The truss material (1) is formed by rotating the bolt (4) by rotating the tip screw (4a) of the bolt (4) projecting outward from the wasper (5) by rotating the wasper (5). It is screwed into the screw hole (7a) of the glove (7) and is joined to the glove (7).

The pipe member (2) is a circular pipe member,
In this embodiment, a heat-treated alloy such as A6061TE-T6 is used in order to secure strength. In addition, the sleeve material (3) is also made of an aluminum material.
-A heat-treated alloy such as T6 material is used. The pipe material (2) and the sleeve material (3) are subjected to a surface treatment (alumite treatment, SD97) before joining.
Since the joining is performed by electromagnetic molding as described later, the surface treatment before joining can be performed without impairing the appearance of the surface treated as in the case of welding. The use of aluminum material contributes to the weight reduction of the truss structure.

The sleeve member (3) is provided with a through hole (9) at the axis thereof for passing a bolt (4). One side of the sleeve material (3) in the axial direction is formed as a circular fitting portion (10) that fits snugly inside the end of the pipe material (2). One annular groove (11) having a rectangular cross section extending in the circumferential direction is formed on the outer peripheral surface of the circular fitting portion (10) at the intermediate portion in the axial direction. The other side in the axial direction of the sleeve member (3) is formed to have a diameter larger than that of the circular fitting portion (10), and a radial line is formed between the two members so as to face the circular fitting portion (10). Step (12) projecting outward in the direction
Are formed.

The joining of the pipe member (2) and the sleeve member (3) is performed as follows. First, as shown in FIG. 1A, before joining the sleeve member and the pipe member (2), a bolt (4) is previously circularly fitted into the through hole (9) of the sleeve member (3). The wire (5) is passed through the end on the joint (10) side and fixed to the tip of a bolt (4) projecting from the other end of the sleeve material (3) with a pin (6). This is in view of the practical difficulty in mounting the bolts (4), the washer (5) and the like after the pipe material (2) and the sleeve material (3) are joined and integrated. In addition,
The bolt (4) may be fixed with a normal nut.

Next, as shown in FIG. 1B, the circular fitting portion (10) of the sleeve material (3) is fitted inside the end of the pipe material (2). The contact between the step surface (12) of the sleeve member (3) and the end surface of the pipe member (2) allows the sleeve member (3) to be easily positioned at an appropriate position with respect to the pipe member (2).

Thereafter, the step surface (1) of the sleeve material (3)
While pressing 2) against the end face of the pipe material (2),
As shown in (c), the end peripheral wall of the pipe member (2) is subjected to electromagnetic forming in the contraction direction from the outer peripheral side.

In the electromagnetic molding, as shown in FIG. 1C, an electromagnetic molded coil for contraction is used.
A fitting portion between the sleeve material (3) and the pipe material (2) is arranged concentrically, and a magnetic flux concentrator (15) is arranged between the fitting portion and the coil. This is performed by applying a large current. By applying a large current at this moment,
The magnetic flux concentrator (15) and the end peripheral wall of the pipe member (2) cause magnetic repulsion, and the magnetic repulsive force acts on the end peripheral wall of the pipe member (2) in the direction of contraction, thereby reducing the pipe material. The end peripheral wall of (2) is plastically deformed and projected into the annular groove (11) of the sleeve material circular fitting portion (10), and the pipe material (2)
And the sleeve material (3) are combined and integrated. Annular groove (1
The engagement between 1) and the plastic recessed portion (14) of the peripheral wall at the end of the pipe material (2) increases the joint strength, especially in the pipe axis direction. Further, since the annular groove (11) is formed in a rectangular cross section, the joining strength is further enhanced. Further, during the plastic deformation of the end wall of the pipe member (2) into the annular groove (11), the end wall is compressed in the axial direction by the above-mentioned pressing as shown in FIG. Since the force acts, the wall does not become thinner when trying to enter into the annular groove (11), and the end face of the pipe material (2) is reduced by the pressing described above to the sleeve material (3).
The appearance and appearance of the circular fitting portion (10) can be integrated without being separated from the step surface (12) of the circular fitting portion (10).

As described above, a strong and firm joint can be formed in the joint region without causing a decrease in base material strength due to thermal influence as in the case of welding. Further, the strength of the bolt (4) is not reduced by the heat effect due to this joining.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the invention. For example, the material of the pipe material (2) may be an aluminum material other than the heat-treated alloy, or various metal materials such as stainless steel. Also, the material of the sleeve material (3) may be an aluminum material other than the heat-treated alloy, various metal materials such as stainless steel, or various materials such as a ceramic material. Further, the annular groove (11) of the circular fitting portion (10) of the sleeve member (3) may have various cross-sectional shapes such as a semicircular cross-sectional shape as shown in FIG. Also, the arrangement may be provided in a plurality of rows such as a two-row layout as shown in FIG. Further, the fitting portion (10) of the pipe member (2) and the sleeve member (3) is not limited to a circular shape, but may be a deformed shape other than a circular shape, for example, a square or a polygon. Further, in the above embodiment, the case where the present invention is applied to the joining of the pipe material (2) and the sleeve material (3) constituting the truss material has been described, but the joining method of the present invention is applied to the end portions of various pipe materials. It goes without saying that the present invention is widely applied including the case where various kinds of second members are joined.

[0024]

As described above, according to the method of joining members according to the present invention, the second member to be joined to the end of the metal pipe material is a fitting that fits snugly inside the end of the pipe material. A fitting portion is provided, and an annular groove extending in a circumferential direction is provided on an outer peripheral surface of an intermediate portion in an axial direction of the fitting portion. A fitting portion of the second member is fitted inside an end portion of the pipe material. And then
By performing electromagnetic forming in the contraction direction from the outer peripheral side of the end of the pipe material, the peripheral wall at the end of the pipe material is caused to protrude into the annular groove of the fitting portion of the second member by plastic deformation, so that the pipe material and the second The joint is integrated with the member, so that a strong and firm joint is formed in the joint area without causing a decrease in the base material strength due to the heat effect as in the case of welding. be able to.

In addition, the end peripheral wall of the pipe material is plastically deformed into an annular groove extending in the circumferential direction on the outer peripheral surface of the fitting portion of the second member in the axial direction intermediate portion, and is joined and integrated. Because of this, by the engagement between the annular groove and the peripheral wall of the pipe end, it is possible to increase the joining strength particularly in the pipe axial direction.

Further, the second member is provided with a step surface projecting outward in the radial direction at a base end portion of the fitting portion. In the electromagnetic molding, the step surface of the second member is formed of a pipe material. It is to be performed while pressing against the end face. Therefore, the second member can be easily positioned on the pipe material at the time of electromagnetic forming. Not only that, it is possible to prevent the end peripheral wall of the pipe material protruding into the annular groove of the fitting portion of the second member from being thinned, and to form a stronger and stronger joint portion. . Further, the two members can be joined and integrated in a good appearance without preventing the end surface of the pipe from being separated from the step surface of the fitting portion of the second member to form a gap.

Further, in the above invention, the second member is made of a sleeve material having a through hole in the axial center portion, and a bolt is inserted into the through hole of the sleeve material so that its head has a head portion on the inner end surface side of the circular fitting portion. In the case where the bolt is inserted with its tip protruding from the other end of the sleeve material, the two members can be joined and integrated without reducing the strength of the bolt by joining. .

[Brief description of the drawings]

1A to 1C are cross-sectional views sequentially showing a method according to an embodiment.

FIG. 2 is a cross-sectional view of the obtained truss material and glove.

FIGS. 3A and 3B are cross-sectional views each showing a modified example of the annular groove.

FIG. 4 is a cross-sectional view of a conventional truss material and glove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Pipe material 3 ... Sleeve material 10 ... Circular fitting part 11 ... Annular groove 12 ... Step surface 14 ... Plastic recessed part 15 ... Magnetic flux concentrator

Claims (2)

[Claims] 1. A joining method for joining a second member to an end portion of a metal pipe material, wherein the second member is fitted into the end portion of the pipe material with good fit. A mating portion is provided, and an annular groove extending in the circumferential direction is provided on the outer peripheral surface of the axially intermediate portion of the fitting portion,
Using a base portion of the fitting portion provided with a stepped surface protruding outward in the radial direction, fitting the fitting portion of the second member to the inside of the end portion of the pipe material, and then While the step surface of the two members is pressed against the end surface of the pipe material, electromagnetic forming in the direction of contraction is performed from the outer peripheral side of the end portion of the pipe material. Wherein the pipe member and the second member are joined and integrated into the annular groove. 2. The second member is made of a sleeve material having a through hole at a shaft center portion, and a bolt is positioned in the through hole of the sleeve material so that a head thereof is positioned on an inner end surface side of the fitting portion. The method for joining members according to claim 1 or 2, wherein the distal end is inserted so as to project from the other end of the sleeve material.