JPH1181656A - Manufacturing method of hollow scaffold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a hollow scaffold using a metal extruded material such as aluminum or an alloy thereof, in which a non-slip protruding portion can be formed extremely easily and inexpensively on front and back face plates. Provided is a means for performing a non-slip processing without any trouble even if a plate is long. SOLUTION: A face plate portion (1) and a side wall portion (2).
A metal hollow scaffold consisting of (2) and partition walls (3) and (3) is applied to two frame members (11) and (12) each having one of the double-sided plate parts (1) and (1). It is divided and each partition wall (3) is attached to one frame material (11) or (12), and both frame materials (11) and (12) are manufactured by extrusion, and burring is applied to the face plate (1). A non-slip protruding portion (4) is formed by processing, and both frame members (11) and (12) are combined into a scaffold shape to connect the side edges (1a) and (2a) to each other, and one of the frame members is formed. The top of the partition wall (3) attached to (11) or (12) and the face plate (1) of the other frame (11) or (12) are integrated by friction stir welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a hollow scaffold made of metal such as aluminum or an alloy thereof, which is used as a scaffold for work at heights in the construction and painting of buildings and houses.

[0002]

2. Description of the Related Art In recent years, a scaffold using an extruded material of aluminum or an alloy thereof has been widely used as a scaffold plate because of its light weight, high strength, and the advantage of being suitable for mass production. Thus, even in a scaffold using such an extruded material, a scaffold provided with a hollow portion continuous in the longitudinal direction is excellent in load resistance, and in particular, a hollow scaffold having a hollow portion as a whole, for example, as shown in FIG. As described above, the front and rear face plate portions (1) and (1), the left and right side wall portions (2) and (2), and the partition wall (10) extending in the longitudinal direction that divides the inside into a plurality of hollow portions (10) and (10). The hollow scaffolds composed of 3) and 3) are advantageous in that they have high load-resistant strength, are hardly bent, can be used without distinguishing between front and back sides, and have good erection workability.

By the way, in the above-mentioned hollow scaffold plate,
In order to prevent the danger of the operator slipping on the feet, it is necessary to provide non-slip projections (4) on the front and rear face plate portions (1). However, in the case of such a hollow extruded profile used as a scaffold plate, it is almost impossible to arrange a punch in a narrow and deep hollow portion (10) and perform a punching operation in a burring process generally used for forming a convex portion. It is possible. For this reason, conventionally, a method of inserting a mold into the hollow portions (10) and (10) and forming the non-slip convex portions (4). Is expensive,
There is a problem that processing is extremely troublesome and productivity is low, and furthermore, it is difficult to apply when the scaffold is long.

In view of the above-mentioned circumstances, the present invention provides a method of manufacturing a hollow scaffold using a metal extruded material such as aluminum or an alloy thereof. It is an object of the present invention to provide a means which can be formed without any trouble even if the scaffold plate is long.

[0005]

In order to achieve the above object, a method of manufacturing a hollow scaffold according to claim 1 of the present invention is described with reference numerals in the drawings. (1) Metal consisting of (1), left and right side walls (2) and (2), and longitudinally continuous partition walls (3) and (3) that divide the interior into a plurality of hollow portions (10) and (10). Hollow scaffolding material is divided into two frame members (11) and (12) each having one of the above-mentioned double-sided plate portions (1) and (1), and each partition wall (3) has one whole. The frame material (11) or (12) is attached to the frame material (11) or (12), and the two frame materials (11) and (12) are manufactured by an extrusion die material. Are formed, the two frame members (11) and (12) are combined into a scaffold shape to form side edges (1a) (2
a), the top (3a) of the partition wall (3) attached to one of the frame members (11) or (12) and the face plate portion (1) of the other frame member (11) or (12). Are integrated by friction stir welding.

In the burring process, the plate is directly pierced by a punch held by an elevating block, or the burring is made to protrude cylindrically around a pre-formed small hole. If the object to be processed is a hollow material, it is difficult to adopt it. However, according to the first aspect of the present invention, the hollow scaffold is divided into a pair of frame members (11) and (12), and both frame members (11) and (12) do not have a hollow portion. Since the portion (1) has a flat plate shape, non-slip convex portions (4)... Can be easily and efficiently formed on the face plate portion (1) by burring.

When the frame members (11) and (12) having the anti-slip projections (4)... Formed by the burring process are combined into a scaffold shape and joined and integrated, the side edges (1a) of each other. ) (2a) can be joined by ordinary welding because the joint portion is exposed to the outside.
Since the joint between the top of the partition wall (3) attached to (1) or (12) and the face plate (1) of the other frame (11) or (12) is on the inside, it is welded to the inner part by welding. It is difficult to join. However, according to the first aspect of the present invention, since the friction stir welding is used, the top of the partition wall (3) and the face plate (1) can be easily and reliably joined.

In this friction stir welding, for example, as disclosed in Japanese Patent Publication No. 7-505090, a probe (rod) made of a material harder than the workpiece is rotated while sliding on the workpiece. When this is done, the workpiece material plastically flows due to the frictional heat and pressure generated at the sliding contact portion, the probe is embedded in the workpiece, and the probe is inserted into the workpiece in this embedded state. 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 flowed on the front side of the advancing probe is stirred and kneaded. While gradually moving to the rear side of the probe and losing frictional heat at the rear side and rapidly cooling and solidifying, the two metal plates are joined together in a state where the materials are stirred and kneaded and are completely integrated .

According to a second aspect of the present invention, in the method for manufacturing a hollow scaffold according to the first aspect, the shape in which the side edges (1a) and (2a) of the two frame members (11) and (12) are fitted to each other. The fitted side edges (1a) and (2a) are connected to each other by welding (30) or friction stir welding. In this case, the anti-slip projection (4) is formed by the burring process.
When the two frame members (11) and (12) formed with ... are combined into a scaffold shape, the side edges (1a) and (2a) are fitted to each other, so that the positioning of the two frame members (11) and (12) is performed. It can be done reliably.

According to the third aspect of the present invention, the first or second aspect is provided.
In the method for manufacturing a hollow scaffold, the top (3a) of the partition wall (3) attached to the frame members (11) and (12) has a T-shaped cross section or an inverted L-shaped cross section. In this case, when the frame members (11) and (12) having the anti-slip projections (4)... Formed by the burring process are combined into a scaffold shape, the top part (3a) of the partition wall (3) and the frame on the other side are combined. Since the contact width of the material (11) or (12) with the face plate portion (1) is widened, joining by friction stir welding can be performed easily and reliably.

According to a fourth aspect of the present invention, in the method for manufacturing a hollow scaffold according to any one of the first to third aspects, the top portion (3) of the partition wall (3) attached to one of the frame members (11) or (12). 3
Since a) and the inner surface of the face plate portion (1) of the other frame member (11) or (12) are fitted to each other, non-slip convex portions (4) are formed by the burring process. When the frame members (11) and (12) are combined into a scaffold shape, the top portion (3a) of the partition wall (3) and the inner surface of the face plate portion (1) are fitted to each other to form the frame members (11) and (12). Positioning is performed more reliably.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a hollow scaffold according to the present invention will be specifically described with reference to the drawings. First, in the present invention, for example, as shown in FIG. 1, front and back face plate portions (1) and (1) and left and right side wall portions (2)
This hollow scaffold is used for manufacturing a metal hollow scaffold consisting of (2) and longitudinally continuous partition walls (3) (3) dividing the interior into a plurality of hollow portions (10) (10). The material is divided into two frame materials (11) and (12) as shown in FIG.

The two frame members (11) and (12) thus divided are configured.
Have the same cross-sectional shape including the face plate portion (1) and the side wall portion (2), and the entire partition wall (3) farther from the side wall portion (2), and are made of aluminum or an alloy thereof. It is manufactured from the same extruded material. Thus, the two frame members (11) and (12) are respectively provided on the side edge portions (1) on the face plate portion (1) side.
a) has a stepped shape lower than the surface of the face plate portion (1), and the side edge portion (2a) on the side wall portion (2) side is formed in an inwardly bent L-shaped cross section. The top part (3a) of (3) has a T-shaped cross section, and the inner wall of the face plate part (1) is thick at the joint position with the partition wall (3) of the frame member (11) or (12) on the other side. A portion (5) is formed, and a fitting recess (5a) is provided at the center of the thick portion (5).

In the manufacturing method of the present invention, anti-slip projections (4) are formed on the face plate portions (1) of the frame members (11) and (12) by burring as shown in FIG.
This burring process is carried out according to the usual method, frame material (11) (12)
While intermittently feeding, the face plate (1) is punched out from the inner surface side by a punch (not shown) held by a movable block, and the required position of the face plate (1) is pierced at regular intervals. . Then, non-slip protruding portions (4)... Formed by rising portions at the periphery of the rupture hole are formed. In addition, this burring process is performed for the frame material (11) (1
It is also possible to carry out continuously from the extrusion step 2).

Next, as shown in FIG. 4, the frame members (11) and (12) having the anti-slip projections (4)... Formed by the burring process have a required length as a scaffold plate. Combine with the scaffold shape. At this time, both frame materials (11)
In (12), as shown in FIG. 5A, the top part (3a) of each partition wall (3) fits into the fitting recess (5a) on the inner surface side of the mating flat plate part (1). At the same time, the side edge (1a) of the one flat plate (1) and the side edge (2a) of the other side wall (2) are fitted as shown in FIG. Positioning is assured.

The frame members (11) and (12) thus combined in the shape of a scaffolding material have a fitting portion between the top portion (3a) of the partition wall (3) and the fitting recess (5a) of the flat plate portion (1). And a fitting portion between the side edge portion (1a) on the flat plate portion (1) side and the side edge portion (2a) on the other side wall portion (2) side is joined and integrated, respectively.
A hollow scaffolding material having anti-slip projections (4) is used. However, the former fitting part is located inside the scaffold,
Although it is difficult to join by ordinary welding means, in the present invention, joining can be easily and reliably integrated by friction stir welding.

As shown in FIG. 6 (a), this friction stir welding is performed at the fitting portion between the top portion (3a) of the partition wall (3) and the fitting recess (5a) of the flat plate portion (1). The probe (22) protruding from the axis of the rotor (21) is inserted while rotating, and the probe (22) is relatively moved along the fitting portion in the inserted state. ) The aluminum or its alloy of (12) plastically flows on the front side of the probe (22) where it advances and gradually moves to the rear side of the probe (22) while being stirred and kneaded, losing frictional heat on the rear side and rapidly Cool to solidify. Therefore, the fitting portions are joined in a completely integrated state as shown in FIG. (20) shows a joint by friction stir welding.

On the other hand, the fitting portion between the side edge portion (1a) on the flat plate portion (1) side and the side edge portion (2a) on the other side wall portion (2) side is
Since it is exposed to the outside, welding (20) by friction stir welding as shown in Fig. 7 (a) and welding (30) by ordinary welding means such as argon welding as shown in Fig. 2 (b) are also possible. It is.

The hollow scaffolding material in which both frame members (11) and (12) are joined and integrated is thus provided with an end plate (not shown) at both ends in the opened longitudinal direction by appropriate means such as welding, friction stir welding, and screwing. Affixed to form a hollow scaffold plate product.

The top (3a) of the partition wall (3),
The fitting portion to the inner surface of the flat plate portion (1) to be joined thereto is not limited to the structure of the above embodiment, but can be variously set. For example, in the structure shown in FIG. 8A, the top part (3a) of the partition wall (3) has a T-shaped cross section, and a groove (3b) continuous in the longitudinal direction is provided on the top surface, while the flat part (1) is provided. A protruding ridge (5b) continuous in the longitudinal direction is provided on the inner surface side of, and the ridge (5b) and the groove (3b) are fitted. Further, in the structure shown in FIG. 2B, two parallel ridges (5c) (5c) continuous in the longitudinal direction are provided on the inner surface side of the flat plate (1), and these ridges (5c) (5c) The top part (3a) having a T-shaped cross section of the partition wall (3) is fitted between 5c).
Further, in the structure shown in FIG. 3C, a fitting piece (5) provided on the inner surface side of the flat plate portion (1) and having an L-shaped cross section continuous in the longitudinal direction is provided.
d) and the top (3) of the partition wall (3) having an inverted L-shaped cross section.
a) is fitted. Each of these fitting portions is a rotor (21) shown by a virtual line in the drawing similarly to the above embodiment.
And joining by friction stir welding with the probe (22).

According to the present invention, the partition wall (3)
The top (3a) of the partition wall (3) has a T-shaped cross section or a non-fitting structure. An inverted L-shape is recommended. That is, if the top portion (3a) of the partition wall (3) has a T-shaped cross section or an inverted L-shaped cross section, the contact width with respect to the inner surface of the flat plate portion (1) is increased, so that the friction stir welding can be easily and reliably performed. Can be done.

In the above embodiment, the two frame members (11) and (12) made of the extruded die have the same sectional shape. For example, one side edge (1a) of the two frame members (11) and (12) is used. (2a)
Are both L-shaped in cross section, and the other side edges (1a) (2a)
May be stepped together, or two partition walls (3) (3) may be attached to only one of the frame members (11) and (12).

Thus, the scaffold to be manufactured in the present invention has a structure in which the inside is partitioned by one or more partition walls (3), and a position which becomes a corner of the hollow portion (10). A structure having a longitudinally continuous groove-shaped screw hole for screwing an end plate at an appropriate position on the inner surface side of the device may be used. In addition to the embodiment, various design changes can be made to the detailed configuration such as the dimensional ratio and thickness of the face plate portion (1) and the side wall portion (2) and the arrangement and size of the anti-slip projections (4). .

[0024]

According to the first aspect of the present invention, in the production of a metal hollow scaffold having an interior partitioned into a plurality of hollows by partition walls, the hollow scaffold is provided with one of front and back face plate portions. Since it is divided into two frame members, and these frame members are manufactured from an extruded material such as aluminum or an alloy thereof and joined and integrated, the non-slip projections provided on the front and back face plate portions are extremely formed by burring. It can be formed easily and inexpensively, and even if the scaffold plate is long, it does not hinder the formation of the anti-slip projection, and the top of the partition wall attached to one frame member and the face plate of the other frame member It can be easily joined to the part.

According to the second aspect of the present invention, in the manufacturing of the hollow scaffold, the side edges of the two frame members are fitted to each other and connected by welding or friction stir welding. When the two frame members having the non-slip projections are combined with the shape of the scaffold, the positioning of the two frame members can be performed reliably, thereby improving the joining accuracy of the two frame members.

According to the third aspect of the present invention, in the production of the above-mentioned hollow scaffold, since the top of the partition wall attached to the frame has a T-shaped cross section or an inverted L-shaped cross section, the two non-slip projections are formed. When the frame material is combined with the scaffold shape, the contact width between the top of the partition wall and the face plate portion of the frame material on the other side is increased, and this contact portion can be easily and reliably joined by friction stir welding. .

According to the fourth aspect of the present invention, in the manufacture of the above-mentioned hollow scaffolding material, when the two frame materials having the anti-slip projections are combined into a scaffold shape, the top of the partition wall attached to one of the frame materials. And the inner side of the face plate portion of the other frame member can be fitted to each other, so that the positioning of the two frame members is more reliably performed, and the joining accuracy of the two frame members is further improved.

[Brief description of the drawings]

FIG. 1 is a vertical side view showing an example of a metal hollow scaffold.

FIG. 2 is a longitudinal sectional side view of a pair of frame members made of a divided extruded member in one embodiment of the method of manufacturing a hollow scaffold according to the present invention.

FIG. 3 is a vertical sectional side view of the frame member provided with a non-slip convex portion on a face plate portion.

FIG. 4 is a longitudinal sectional side view showing a state where both frame members provided with the anti-slip projections are combined into a hollow scaffold material shape.

FIG. 5 shows a main part of the two frame members combined, and (A)
4 is an enlarged cross-sectional view inside a virtual line circle A in FIG. 4, and FIG. 4B is an enlarged cross-sectional view inside a virtual line circle B in FIG. 4.

FIG. 6 shows a joining operation of a fitting portion between a top portion of a partition wall and a face plate portion in both frame materials combined, (a) is a longitudinal side view during joining by friction stir welding, and (b) is after the same joining It is a vertical side view.

FIGS. 7A and 7B show a joint portion between side edge portions fitted to each other in both frame members combined, FIG. 7A is a longitudinal side view of the joint portion by friction stir welding, and FIG. It is a vertical side view.

FIG. 8 illustrates another fitting structure between the top portion of the partition wall of the two frame members and the inner surface of the face plate portion, and (a) to (c) are longitudinal sectional side views of different fitting structures. .

[Explanation of symbols]

 1... Face plate 1a... Side edge 2... Side wall 2a... Side edge 3... Partition wall 3a... Top 3b.・ Groove 4 ・ ・ ・ ・ ・ Slipproof convex part 5 ・ ・ ・ ・ ・ ・ ・ Thick part 5a ・ ・ ・ ・ Fit recess 5b ・ ・ ・ ・ Protrusion 5c ・ ・ ・ ・ Protrusion 5d ・ ・ ・・ Mating piece 10 ・ ・ ・ ・ ・ Hollow part 11 ・ ・ ・ ・ Frame material 12 ・ ・ ・ ・ ・ ・ Frame material 20 ・ ・ ・ ・ ・ Joined part by friction stir welding 21 ・ ・ ・ ・ ・ Rotor 22 ・ ・..... Probe 30

Claims (4)

[Claims] 1. A metal hollow scaffold comprising a front and back face plate portion, left and right side wall portions, and a partition wall continuous in a longitudinal direction which divides the inside into a plurality of hollow portions, each of which is a double-sided plate. And the entire partition wall is attached to one of the frame members. The two frame members are made of an extruded material, and the face plate is slid by burring. After forming the stop projections, combine both frame materials into a scaffold shape and connect the side edges of each other, and friction between the top of the partition wall attached to one frame and the face plate of the other frame A method for producing a hollow scaffold, wherein the method is integrated by stirring and joining. 2. The hollow scaffolding material according to claim 1, wherein the side edges of both frame members have a shape to be fitted to each other, and the fitted side edges are connected by welding or friction stir welding. Production method. 3. The top of the partition wall attached to the frame material has a cross section T.
The method for producing a hollow scaffold according to claim 1 or 2, wherein the hollow scaffold has a shape of a letter or an inverted L. 4. The hollow scaffold according to claim 1, wherein the top of the partition wall attached to one of the frame members and the inner surface of the face plate of the other frame member are fitted to each other. Manufacturing method.