JPH06328273A - Method for joining metallic rods or wire rods - Google Patents

Abstract

PURPOSE:To provide the joining method capable of satisfactorily joining a couple of materials to be joined consisting of the metallic rods or wire rods while these are held in an unrotational state and also easy in deburring. CONSTITUTION:A short-sized metallic rod or wire rod is interposed as joining material 14 between the ends of the couple of materials 10 and 12 to be joined consisting of the metallic rods or wire rods and both end faces of the joining material 14 are opposed to the end faces of those couple of materials 10 and 12 to be joined, respectively. Both ends of the joining material 14 and each end of the corresponding materials 10 and 12 to be joined are subjected to friction welding together by rotating the joining material 14 while those couple of materials 10 and 12 to be joined are held in an unrotational state.

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 metal rods or wires, and more particularly to a joining method using friction welding.

[0002]

2. Description of the Related Art As a method for joining metal rods or wires, a joining method by friction welding has been known. The joining method by this friction welding is
As shown in the schematic view of FIG.
This is a method in which two pieces are abutted against each other for relative rotational movement (for example, either 102 is fixed and 100 is rotated) and the frictional heat generated on the contact surface is used for pressure contact. In this method, the abutting surfaces of the materials to be joined and the vicinity thereof reach a predetermined temperature due to frictional heat and are softened and joined together.

By the way, when drawing a rod or wire (hereinafter, the wire will be mainly described), such a wire is wound into a coil, and the wire is successively taken out from the coil to reduce the cross-sectional area through a hole in a die. Let
It is designed to be processed into a thin wire with a predetermined size.

At the time of this wire drawing, the starting end of the conventional coil is made thin (has a mouthpiece), and this thin portion is first passed through the hole of the die and then wire drawing is performed. Therefore, in the conventional wire drawing method, when the wire drawing of one coil is completed, the work is interrupted once, and the starting end portion of the next coil which is pierced is passed through the hole of the die again. Since it is necessary to continue the processing after setting the wire, it is difficult to continuously shift from the wire drawing of one coil to the wire drawing of the next coil, which impedes productivity. It was a factor.

In this case, if the end portion of one coil and the start portion of the next coil are preliminarily joined by the friction welding, continuous wire drawing from one coil to the next coil becomes possible. Moreover, it is not necessary to form the start end of each coil, but it is necessary to rotate the welded material in the conventional friction welding method as described above. The reality is that it is actually difficult to apply them to joints.

[0006]

The present invention has been made in view of the above circumstances, and its gist is to provide a short metal rod or a short metal rod between the end portions of a pair of members to be joined each made of a metal rod or a wire. Inserting a wire as a joining material so that both end surfaces of the joining material face the respective end surfaces of the pair of materials to be joined, and holding the pair of materials to be joined in a non-rotating state while rotating the joining material. By this, the both ends of the bonding material and the corresponding ends of the material to be bonded are friction-welded.

[0007]

As described above, according to the present invention, by using a short metal rod or wire as the joining material, the pair of materials to be joined is rotated by rotating the joining material while holding the joining material in a non-rotating state. Friction pressure welding is performed.

FIG. 1 schematically shows such a joining method of the present invention. In the figure, reference numerals 10 and 12 denote materials to be joined made of metal rods or wires, and reference numeral 14 denotes a joining material made of short metal rods or wires. Portion and the other end of the joining material 14 and the end of the other joined material 12 are brought into contact with each other in a butting state at a predetermined pressure, and frictional heat is generated at each butting end by the rotational movement of the joining material 14. Then, the respective ends are softened by the heat, and the three members, that is, the members to be joined 10, 12 and the joining member 14 are joined to one rod or wire. In the case of this joining method, burr 15 is generated at the joining portion,
This will be removed.

In the present invention, the joining material 14 is held by the rotating body while being rotationally driven. Therefore, the burr 15 is joined by providing a deburring blade on the rotating body. At the same time, it can be automatically removed.

That is, the present invention is suitable as a joining method for performing deburring together, and when the present invention is applied to the joining of the terminal end portion and the starting end portion of the above wire rod coil, It is possible to join the starting end without rotating it, and at the same time, it is possible to automatically remove burrs that have occurred, and to perform continuous wire drawing from one coil to the next. It becomes possible and the production efficiency can be effectively increased.

Further, in this case, it is possible to eliminate the need for forming the start end portion for each coil, which can reduce the number of man-hours and improve the material yield rate.

The present invention can be applied not only when joining the same kind of materials (materials to be joined) but also when joining different kinds of materials. In this case, as the joining material 14, a different kind of material is used. Used, for example, 1
It is possible to make it possible to detect the 0 and 12 joints. For example, by using a ferromagnetic material as the bonding material 14, it is possible to detect the bonding site of the materials 10 and 12 to be bonded by a magnetic sensor.

[0013]

EXAMPLES Examples of the present invention will be described in detail below. FIG. 2 schematically shows a configuration example of an apparatus suitable for carrying out the method of the present example. In the figure, 10 and 12 are materials to be joined each made of a metal rod or a wire, and 14 has the same thickness. It is a joining material composed of metal rods or wires.

Reference numeral 16 is a holding device for holding the materials to be joined 10 and 12 in a non-rotating state, and 18 is a rotary drive device for rotatably driving the joining material 14. The holding device 16 has a main body 11 and a chuck 13, and a drive cylinder 19 is connected to the main body 11. The cylinder 19 causes the main body 11 to move along a rail 22 on a bed 20 in the left and right directions in the drawing. It is possible to move back and forth.

The rotary drive device 18 includes a rotating body 26 rotatably supported by a bearing 24. Rotating body 2
6, a chuck 28 for holding the bonding material 14 is provided, and a gear 30 is provided on the outer peripheral surface. A gear fixed to the output shaft from the drive motor 32 with respect to this gear 30. 34 is meshed.

In the method of this embodiment, the holding device 16 holds the members to be joined 10 and 12 in a non-rotating state while the joining member 14 is held.
The materials 10 and 1 to be joined are rotated by the rotary drive device 18.
The end surfaces of 2 and the bonding material 14 are pressed into a butt state with a predetermined pressure (friction pressure), and the frictional heat generated at that time heats and softens the end portions of the respective materials.

When the ends of the respective materials are softened, the materials 10 and 12 to be welded are displaced (pushed) to the side of the welding material 14 with a constant pressure (upset pressure) to perform the welding.

At this time, burrs are generated at the joints between the materials to be joined 10, 12 and the joining material 14, which burrs are shown in FIG. 2 (B).
As shown in FIG. 3, the chuck 28 can be opened immediately after the joining is completed and can be removed at the same time as the joining is completed by the cutting tool 36 provided on the rotating body 26.

It is desirable that the above-mentioned joining material 14 has a length of 100 mm or more, and it is desirable that the axial pressing load and displacement amount of the pair of joined materials 10, 12 with respect to the joining material 14 are equal. This is for reliably and satisfactorily joining the pair of joined materials 10 and 12 and the joining material 14.

In order to equalize the axial load and displacement in the above apparatus, a load detecting means such as a load cell, a displacement sensor, etc. are provided, and while performing load detection and displacement detection by these, the material 10 to be welded by the cylinder 19 is connected. , 12 may be controlled in the axial load and displacement.

As described above, according to the method of this embodiment, while holding the pair of members to be joined 10 and 12 in a non-rotating state, the short joining member 14 interposed between them is rotated, The pair of materials 10 and 12 to be bonded is bonded via the bonding material 14.

Therefore, this method can be suitably used as a method of joining the terminal end portion 40 and the starting end portion 42 of the wire rod coil 38 as shown in FIG. Thereby, the wire rod can be joined between the coils 38 while the wire rod is pulled out from the coil 38 and subjected to processing such as wire drawing, or the wire rods can be joined in advance between the plurality of coils 38. Thus, it becomes possible to continuously perform processing such as wire drawing on the plurality of coils 38. Further, burrs generated at that time can be removed at the same time as joining, and it is possible to prevent such burrs from becoming an obstacle to processing.

[Experimental Example 1] Materials to be bonded 10, 1 shown in FIG.
2, a material having S45C and a diameter of 20 mmφ was used, and a bonding material 14 was made of a material having S45C and a diameter of 20 mmφ, and the joining test was performed under the following conditions.

<Conditions> Rotation speed 2000 rpm Friction pressure 7 kgf / mm ² Upset pressure 8 kgf / mm ² Upset amount 10 mm

Burrs cut out from the joints A and B were excised to prepare a JIS Z 22012 tensile test piece, and a tensile test was carried out. The following results were obtained.

[0026]

[Experimental Example 2] As materials 10 and 12 to be welded and a material 14 to be welded, SUS304 steel (steel type defined in JIS G 4304, diameter 12 mmφ) was used, and a joining test was conducted under the following conditions.

[0028] <Conditions> rpm 3000rpm friction pressure 6 kgf / mm ² upset pressure 7 kgf / mm ² upset amount 7mm

Then, in the same manner as described above, the burrs cut out from the joints A and B were cut off to prepare a tensile test piece, and a tensile test was conducted. The following results were obtained.

[0030]

As described above, it was confirmed that the materials 10 and 12 to be bonded and the bonding material 14 were well bonded in any experimental example. Note that the content specifically shown above is merely an example of the present invention, and the present invention can be implemented in a mode in which various modifications are made based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a joining method of the present invention.

FIG. 2 is a diagram showing a configuration example of an apparatus for carrying out the joining method of the present invention.

FIG. 3 is a diagram showing an example in which the same joining method is applied to joining wire rod coils.

FIG. 4 is an explanatory diagram of an experimental example of the present invention.

FIG. 5 is a diagram schematically showing a conventional friction welding method.

[Explanation of Codes] 10, 12 Materials to be bonded 14 Materials to be bonded 15 Burrs

Claims (1)

[Claims] 1. A short metal rod or wire is inserted as a joining material between the ends of a pair of materials to be joined, which are composed of metal rods or wires, and both end faces of the joining material are respectively end faces of the pair of materials to be joined. And a pair of members to be joined are held in a non-rotating state while the members to be joined are rotated to frictionally weld both ends of the member to corresponding ends of the member to be joined. A method for joining metal rods or wire rods characterized by the above.