JPH05317958A - Production of pipe made of aluminum composite material - Google Patents

Abstract

PURPOSE:To produce the pipe made of an aluminum composite material having the strength to make the pipe sufficiently usable as frames or parts, etc., of vehicles by combining wires for reinforcement with an aluminum pipe. CONSTITUTION:The aluminum pipe 1 having internally expanded grooves 3 at the outer peripheral edge is formed by extrusion working. The wires 2 for reinforcement are inserted to a required length into the internally expanded grooves 3 of the pipe 1. The pipe 1 having the wires 2 for reinforcement is so worked and deformed that its outside shape contracts, by which the wires 2 for reinforcement are fixed to the pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an aluminum composite pipe used as, for example, a frame or a part of a vehicle.

In this specification, aluminum means an aluminum alloy in addition to pure aluminum.

[0003]

2. Description of the Related Art Conventionally, steel pipes or stainless steel pipes have been known as pipes used for frames or parts of vehicles such as automobiles, trains, bicycles, and motorcycles.

[0004]

However, such conventional steel pipes or stainless steel pipes are very heavy, difficult to process, expensive to manufacture, and easily rusted. There was a problem.

On the other hand, when an aluminum pipe is used for the frame or parts of the vehicle, for example, there is a problem that the strength is not sufficient.

The object of the present invention is to solve the above-mentioned problems of the prior art, and by combining a reinforcing wire with an aluminum pipe, the aluminum composite material having sufficient strength to be used as a vehicle frame or parts, etc. Manufacture of aluminum composite pipe, which is capable of producing pipes, and the obtained aluminum composite pipe is lightweight, has a very low production cost, and has excellent corrosion resistance and durability. In trying to provide the law.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is made of aluminum having at least one internal enlargement groove which is opened outward in the longitudinal direction at the outer peripheral edge portion by extrusion of aluminum. The first to make a pipe
Step, a second step of inserting a reinforcing wire into the internal expansion groove of the pipe for a required length, and a pipe having the reinforcing wire is processed to reduce its outer shape, and both sides of the opening of the internal expansion groove are processed. The gist is a method of manufacturing an aluminum composite pipe, which comprises a third step of deforming a wall so that an opening is closed and fixing a reinforcing wire to the pipe.

In the first step, the aluminum pipe usually has a circular cross section, but it may have an elliptical cross section or a polygonal cross section.
Further, the shape of the internal enlarged groove formed in this pipe is usually a truncated circle, but it may of course be any other shape, and before the deformation of the pipe, the reinforcing wire can be housed therein. Any shape may be used as long as it has an opening at the outer peripheral edge that is open outward in the longitudinal direction of the pipe.

The reinforcing wire used in the second step may be a wire having strength such as steel wire, stainless steel wire, graphite wire and the like. It is usually preferable to insert such a reinforcing wire into the internal expansion groove of the aluminum pipe over substantially the entire length of the pipe, but in some cases, only the portion requiring the reinforcement of the pipe is reinforced for the required length. Wires for use may be inserted.

In the third step, examples of means for processing the pipe having the reinforcing wire material so that the outer shape thereof is reduced include roll crimping or drawing. By any of these processes, both side walls of the opening of the internal expansion groove of the pipe are deformed so that the opening is closed, and the reinforcing wire is fixed to the pipe.

[0011]

In the method of the present invention described above, after the reinforcing wire is inserted into the internal expansion groove of the aluminum pipe for the required length,
The external shape of the pipe is reduced and deformed so that the opening of the internal expansion groove is closed, and the reinforcing wire is fixed to the pipe.

Therefore, according to the method of the present invention, an aluminum composite pipe composed of an aluminum pipe and a reinforcing wire such as a steel wire, a stainless steel wire, or a graphite wire can be manufactured very efficiently. it can. Since the strength of the obtained aluminum composite material pipe is increased by the reinforcing wire rod, it has sufficient strength that it can be used as a frame or parts of a vehicle. Further, since the aluminum composite pipe is mainly made of a lightweight aluminum pipe, the weight can be reduced. Moreover, since the aluminum composite pipe can be mass-produced very efficiently, the manufacturing cost is very low. Furthermore, since the reinforcing wire made of steel wire or stainless steel wire is not exposed to the outside, rust does not occur, and the composite pipe has excellent corrosion resistance and durability.

[0013]

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

The drawings are for explaining the method of the present invention in the order of steps.

According to the method of the present invention, an aluminum composite pipe was manufactured by carrying out the following three steps.

First Step First, as shown in FIG. 1, an aluminum pipe having four internal enlargement grooves (3) with a circular cross section open outward in the longitudinal direction at the outer peripheral edge portion by extrusion of aluminum. I made (1).

Second step Next, as shown in FIG. 2, the internal enlarged groove of the pipe (1)
A reinforcing wire (2) made of, for example, a steel wire was inserted into (3) over substantially the entire length.

Third Step Finally, as shown in FIGS. 3 and 4, the pipe (1) having the reinforcing wire (2) is processed by roll crimping so that its outer shape is reduced, and an internal enlarged groove ( 3) Opening side walls (5) (5)
The reinforcing wire rod so that the opening (4) is blocked.
(2) was fixed to the pipe (1).

By the above method of the present invention, the aluminum composite pipe (6) consisting of the aluminum pipe (1) and the reinforcing wire (2) could be produced very efficiently. The strength of the obtained aluminum composite material pipe (6) was increased by the reinforcing wire (2), so that it had sufficient strength to be used as a vehicle frame or parts.

The aluminum composite pipe (6) is
Since the main material is a lightweight and relatively soft aluminum pipe (1), it was lightweight and easy to cut and process.

[0021] Further, for example, a reinforcing wire made of steel wire (2)
Since it was not exposed to the outside, no rust was generated and the composite pipe (6) had excellent corrosion resistance and durability.

In the above embodiment, the aluminum pipe (1) having the four internal enlarged grooves (3) having a circular cross section is used, but the aluminum pipe (1) is
Any material may be used as long as it has at least one internal expansion groove (3) open outward in the longitudinal direction at its outer peripheral edge.

In the above embodiment, the reinforcing wire (2) is
Insert the pipe into the internal expansion groove (3) of the aluminum pipe (1).
It is inserted and fixed over almost the entire length of (1), but in some cases, a short length of reinforcing wire (2) is inserted and fixed only in the part of the pipe (1) that requires reinforcement. However, it is good.

[0024]

As described above, according to the method of the present invention, the first step of forming an aluminum pipe having at least one internal expansion groove that is open outward in the longitudinal direction at the outer peripheral edge portion by extruding aluminum. And a second step of inserting a reinforcing wire into the internal expansion groove of the pipe for a required length, and a pipe having the reinforcing wire is processed to reduce its outer shape, and both side walls of the opening of the internal expansion groove are processed. The third step of fixing the reinforcing wire to the pipe by deforming so that the opening is blocked. A material pipe can be manufactured very efficiently and inexpensively. Moreover, since the strength of the obtained aluminum composite material pipe is increased by the reinforcing wire rod, it has sufficient strength to be used as a vehicle frame, parts, or the like. Further, since the aluminum composite material pipe is mainly made of a lightweight and relatively soft aluminum pipe, it is lightweight and easy to be cut and processed, and the reinforcing wire is not exposed to the outside. It has no corrosion and has excellent corrosion resistance and durability. Therefore, by using the aluminum composite material pipe manufactured by the method of the present invention for the frame or parts of the vehicle, it is possible to reduce the weight of the frame or parts of the vehicle while sufficiently maintaining the strength thereof. At the same time, workability can be improved, corrosion resistance and durability can be improved, and the manufacturing cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an aluminum pipe made by a first step of the present invention.

FIG. 2 is a partial perspective view showing an aluminum pipe in which a reinforcing wire is inserted into an internal enlarged groove in the second step of the present invention.

FIG. 3 is a partial perspective view showing an aluminum pipe to which a reinforcing wire is fixed in the third step of the present invention.

FIG. 4 is an enlarged sectional view of a main part of FIG.

[Explanation of symbols]

 1 Aluminum Pipe 2 Reinforcing Wire 3 Internal Enlarged Groove 4 Opening 5 Opening Side Walls 6 Aluminum Composite Pipe

Claims (1)

[Claims] 1. A first method for extruding aluminum (including aluminum alloy) to form an aluminum pipe (1) having at least one internal expansion groove (3) opened outward in the longitudinal direction at the outer peripheral edge. Process and this pipe
The second step of inserting the reinforcing wire (2) into the inner enlarged groove (3) of (1) for the required length, and the pipe (1) having the reinforcing wire (2)
Is processed so that its outline shrinks, and the internal expansion groove (3)
Open the both side walls (5) (5) of the pipe by deforming them so that the opening (4) is closed, and fix the reinforcing wire (2) to the pipe (1).
A method of manufacturing an aluminum composite pipe, which comprises a process and a process.