JP4629241B2 - Termination part treatment method in friction stir welding and termination part treated friction stir welded body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating a terminal hole generated at a terminal end of a joint in friction stir welding, and a friction stir welded body that has been treated at the terminal end.
[0002]
[Prior art]
Friction stir welding is a type of solid-phase joining in which the metal at the joint is plastically flowed with stirring heat and joined by cooling and solidification. The amount of heat input is smaller than that of fusion welding or brazing, and deformation or cracking due to thermal strain occurs. There is an advantage that the composition does not change even in the case of an alloy.
[0003]
For example, in the manufacture of the lap joint of the metal plates (1) and (1) shown in FIGS. 1 (A) and (B), the probe (3) projecting from the axis of the rotor (2) is rotated and joined. It is embedded at the beginning of the line and moved along the joining line. Thereby, on the front side of the traveling probe (3), the material of the metal plate (1) (1) plastically flows by frictional heat and pressure, and gradually moves to the rear side of the probe (3) while being stirred and kneaded. Since the rear side loses frictional heat and rapidly cools and solidifies, the two metal plates (1) and (1) are joined together in a state where the material metals are agitated and kneaded and completely integrated. Then, the joining operation is completed by pulling out the probe (3).
[0004]
Further, in the above-described friction stir welding, as shown in FIG. 1B, a hole (10) corresponding to the probe diameter is formed by pulling out the probe (3) at the end of the joining. If there is such a terminal hole (10) in the joined body, it will hinder the application and the appearance quality will be deteriorated. Hole processing is performed by providing a plate and allowing the terminal hole to escape from the effective portion.
[0005]
[Problems to be solved by the invention]
However, in the hole filling method, a hole filling step after joining is required, and the metal structure or material of the filled portion is different from that of the base material portion. Further, in the method of letting the terminal hole out of the effective portion, a tab plate is newly required, and the joining length becomes long. Both methods have a problem in that the number of steps and materials increase, and the manufacturing cost of the joined body increases.
[0006]
In view of the above-mentioned technical background, the present invention simplifies the manufacturing process of a friction stir welded body, and provides a terminal stir processing method in friction stir welding without using an extra material, and a friction stir welded body subjected to the terminal end treatment. With the goal.
[0007]
[Means for Solving the Problems]
In the friction stir welding of the present invention, the end treatment method is used to achieve the above-mentioned purpose, in which the probe (3) of the rotor (2) is embedded along the joining line between the metal materials (1) (1). At the time of friction stir welding in which both metal materials (1) and (1) are joined and integrated while being rotated at the end of the joint (10), the end hole (10) generated by pulling out the probe (3) is threaded. And a screw hole (11) is formed.
[0008]
In addition, the friction stir welded body subjected to the termination processing of the present invention proceeds while rotating the probe (3) of the rotor (2) in an embedded state along the joining line between the metal materials (1) (1). In the joined body in which both metal materials (1) and (1) are joined and integrated by friction stir welding, a screw hole (11) is formed at the joining end portion.
[0009]
In the end portion processing method in the friction stir welding of the present invention, the terminal hole (10) that inevitably occurs in the friction stir welding is processed into the screw hole (11) and actively used, thereby performing the termination that has been conventionally performed. There is no need for a tab plate for filling the hole or escaping the terminal hole outside the effective portion. The formed screw hole (11) can be used for attaching the joined body, and the screw hole can be formed by a simpler operation than performing new screw processing.
[0010]
Further, the friction stir welded body of the present invention that has been subjected to the end portion treatment by this method does not have the end hole (10) and does not have a hole filling mark made of another material.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, taking the above-mentioned lap joint shown in FIGS. 1 (A) and 1 (B) as an example, the end part processing method and the end part processed friction stir welded body in the friction stir welding of the present invention will be described in detail. Describe.
[0012]
Fig. 1 (A) shows friction stir by rotating the probe (3) of the rotor (2) in the embedded state against the two stacked metal plates (1) (1) in the direction of the arrow. The joined state is shown. FIG. 1 (B) shows a state in which the rotor (2) is pulled up and the probe (3) is pulled out at the end of the joint. ) A terminal hole (10) having an equivalent diameter is formed.
[0013]
FIG. 2 shows a state in which a screw hole is formed on the terminal hole (10) to form a screw hole (12). In friction stir welding, the probe (3) is also agitated around the probe (3) by the rotation of the probe (3), so that not only the probe (3) pass line but also the front and side of the probe (3) in the traveling direction are joined. The Therefore, the hole diameter of the terminal hole (10) is equivalent to the diameter of the probe (3), but the periphery of the terminal hole (10) is joined in a range wider than the diameter of the probe (3). For this reason, the hole diameter of the screw hole (11) can be made larger than that of the terminal hole (10), and screw processing can be performed without any trouble.
[0014]
The terminal hole (10) formed in the joining example of FIGS. 1 and 2 is a bottomed blind hole, but the probe (3) is penetrated in the thickness direction of the metal material (1) (1). When it joins, it becomes a through hole. Further, even if the terminal hole (10) is a blind hole, it can be formed in a screw hole penetrating by screw processing, and both cases belong to the category of the terminal part processing method and the friction stir bonded body of the present invention.
[0015]
Further, the joint shape of the metal material is not limited to the lap joint in the illustrated example, and can be applied to joints of any shape such as butting.
[0016]
Thus, the screw hole formed using the terminal hole of the friction stir welding can be used as a screw hole for screwing the joined body to another member. Since the end hole is used as a screw hole, it is not necessary to fill with a separate material or a tab plate, and it is only necessary to set the traveling path of the probe so that the required screw hole position becomes the friction stir welding end point on the planned joining line.
[0017]
For example, when manufacturing the friction stir welded body (20) shown in FIG. 3, when a mounting screw hole is formed at the position A on the planned joining line L of the two metal plates (1) and (1) superimposed, The probe (3) is inserted into the joining start point B, the probe (3) is advanced along the route indicated by the arrow, and the probe (3) is pulled out at the joining end point A. Then, the above-described screw processing is performed on the terminal hole (10) formed at the joining end point A to form the screw hole (11). Note that the joining does not need to be performed with one traveling path, and the joining is performed with one or a plurality of traveling paths according to the shape of the planned joining line and the required number of screw holes.
[0018]
Further, by using the terminal hole for screw processing, it is possible to form the screw hole by a simple operation because the processing step of the pilot hole can be omitted, rather than performing the screw processing in a separate process from the joining operation.
[0019]
Therefore, in the processes from the friction stir welding to the mounting screw hole formation, the material and the number of processes can be reduced. Moreover, the manufactured friction stir welded body has no trace of holes and has good appearance quality.
[0020]
Further, as a preferred application example of the termination treatment method and friction stir bonded body of the present invention, grooves for cooling medium flow passages are formed on two metal plates, overlapped and integrated, and attached to another member. The production of the backing plate and cooling plate used can be listed.
[0021]
【The invention's effect】
As described above, in the friction stir welding method according to the present invention, the termination processing method is performed by advancing the rotor probe along the joining line between the metal materials while rotating them in an embedded state, thereby joining the two metal materials together. At the time of friction stir welding, a screw hole is formed in the terminal hole generated by pulling out the probe at the terminal part of the joint to form a screw hole. A tab plate is not required to escape. Thus, by actively using the terminal holes that are inevitably generated as mounting screw holes, it is possible to reduce the materials and the number of processes in the processes from the friction stir welding to the mounting screw hole formation. As a result, the manufacturing cost of the friction stir bonded body manufactured by applying this processing method can be reduced.
[0022]
Further, the friction stir welded body subjected to the end treatment by this method has no joining end hole, no hole filling marks made of another material, and has excellent appearance quality.
[Brief description of the drawings]
FIGS. 1A and 1B are partial cross-sectional views showing an example of friction stir welding, where FIG. 1A shows an embedded state of a probe and FIG. 1B shows a pulled-out state of a probe.
FIG. 2 is a cross-sectional view showing a state in which the end hole is threaded in the end portion processing method and friction stir welded body in the friction stir welding according to the present invention.
FIG. 3 is a perspective view showing an example of a traveling path of a probe in the end portion processing method and friction stir welded body in the friction stir welding according to the present invention.
[Explanation of symbols]
1 ... Metal material (metal plate)
2 ... Rotor 3 ... Probe
10 ... Terminal hole
11 ... Screw hole
20… Friction stir bonded body

Claims (2)

Rotate the probe (3) of the rotor (2) along the joining line between the metal materials (1) and (1) while rotating in the embedded state to join and integrate both metal materials (1) and (1). When the friction stir welding is performed, the terminal end in the friction stir welding is characterized by forming a screw hole (11) by screwing the terminal hole (10) generated by pulling out the probe (3) at the terminal end of the joint. Processing method. The two metal materials (1) and (1) are brought into contact with each other by friction stir welding in which the probe (3) of the rotor (2) rotates while being embedded along the joining line between the metal materials (1) and (1). A friction stir bonded body subjected to termination processing, characterized in that a screw hole (11) is formed in a bonding termination portion in the bonded integrated body.

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