US-12623300-B2 - Method for manufacturing joined body, and joining device

US12623300B2US 12623300 B2US12623300 B2US 12623300B2US-12623300-B2

Abstract

There is provided a method for manufacturing a joined body using a rotary tool with a stirring pin to perform friction stirring on a composite body having a first surface and a second surface that is different from the first surface. In the composite body, metal members are combined together in a joined arrangement. The method includes the steps of: forming the composite body by combining the metal members in the arrangement; fixing the composite body in a state where the metal members are combined together; performing friction stir welding by inserting the stirring pin through the first surface into the composite body that has been fixed; rotating the fixed composite body such that the second surface is in a positional relationship to face the rotary tool; and performing friction stir welding by inserting the stirring pin through the second surface into the fixed composite body.

Inventors

Nobushiro Seo
Shingo Koizumi

Assignees

NIPPON LIGHT METAL COMPANY, LTD.

Dates

Publication Date: 20260512
Application Date: 20220512
Priority Date: 20210607

Claims (9)

1 . A method for manufacturing a joined body using a rotary tool with a stirring pin to perform friction stirring on a composite body having a first surface and a second surface that is different from the first surface, wherein in the composite body, metal members are combined together in a joined arrangement, the method comprising: an arrangement step of forming the composite body by combining the metal members in the arrangement; a fixing step of fixing the composite body with a fixing tool in a state where the metal members are combined together; a first friction stirring step of performing friction stir welding by inserting the stirring pin through the first surface into the composite body that is fixed by the fixing tool; a rotating step of rotating the composite body and the fixing tool such that the second surface is in a positional relationship to face the rotary tool; and a second friction stirring step of performing friction stir welding by inserting the stirring pin through the second surface into the composite body that is fixed by the fixing tool.
2 . The method for manufacturing a joined body according to claim 1 , wherein in the arrangement step, the metal members are arranged such that the first surface faces the rotary tool.
3 . The method for manufacturing a joined body according to claim 1 , further comprising, after the fixing step, a placing step of placing the composite body fixed by the fixing tool such that the first surface is in a positional relationship to face the rotary tool.
4 . The method for manufacturing a joined body according to claim 1 , wherein the fixing step includes fixing the composite body with the fixing tool by holding a peripheral area along a friction stirring site on the first surface.
5 . The method for manufacturing a joined body according to claim 1 , wherein the fixing step includes fixing the composite body with the fixing tool by holding the entire first surface except a friction stirring site on the first surface.
6 . A method for manufacturing a joined body using a rotary tool with a stirring pin to perform friction stirring on a composite body having a first surface and a second surface that is different from the first surface, wherein in the composite body, metal members are combined together in a joined arrangement, the method comprising: an arrangement step of forming the composite body by combining the metal members in the arrangement; a fixing step of fixing the composite body with a fixing tool in a state where the metal members are combined together; a first friction stirring step of performing friction stir welding by inserting the stirring pin through the first surface into the composite body that is fixed by the fixing tool; a rotating step of rotating the composite body and the fixing tool such that the second surface is in a positional relationship to face the rotary tool; and a second friction stirring step of performing friction stir welding by inserting the stirring pin through the second surface into the composite body that is fixed by the fixing tool; wherein the fixing step includes fixing the composite body by sandwiching the first surface and a site of the composite body opposite to the first surface with the fixing tool.
7 . A method for manufacturing a joined body using a rotary tool with a stirring pin to perform friction stirring on a composite body having a first surface and a second surface that is different from the first surface, wherein in the composite body, metal members are combined together in a joined arrangement, the method comprising: an arrangement step of forming the composite body by combining the metal members in the arrangement; a fixing step of fixing the composite body in a state where the metal members are combined together; a first friction stirring step of performing friction stir welding by inserting the stirring pin through the first surface into the composite body that has been fixed; a rotating step of rotating the fixed composite body such that the second surface is in a positional relationship to face the rotary tool; and a second friction stirring step of performing friction stir welding by inserting the stirring pin through the second surface into the fixed composite body; wherein the fixing step includes fixing the composite body with a fixing tool by sandwiching the entire first surface except for a friction stirring site and the entire second surface except for a friction stirring site, the second surface being opposite to the first surface of the composite body.
8 . The method for manufacturing a joined body according to claim 1 , wherein the arrangement step includes overlapping the metal members on each other to form the composite body having an overlapped portion on the first surface or the second surface, in which the metal members are overlapped on each other, and the first friction stirring step or the second friction stirring step includes performing friction stir welding by inserting the stirring pin through the overlapped portion.
9 . The method for manufacturing a joined body according to claim 1 , wherein the arrangement step includes butting the metal members against each other to form the composite body having a butted portion on the first surface or the second surface, in which the metal members are butted against each other, and the first friction stirring step or the second friction stirring step includes performing friction stir welding by inserting the stirring pin through the butted portion.

Description

This application is a National Stage Application of PCT/JP2022/020053, filed May 12, 2022, which claims the benefit of priority to Japanese Patent Application No. 2021-095105, filed Jun. 7, 2021, and which applications are incorporated herein by reference. To the extent appropriate, a claim of priority is made to each of the above disclosed applications. TECHNICAL FIELD The present invention relates to a method for manufacturing a joined body and a joining device. BACKGROUND ART Friction stir welding is performed on a composite body obtained by combining joint members through butting or overlapping. When performing such friction stir welding, it is common to place the joint members on a backing plate to form a composite body and then fix the composite body using clamps or jigs. Subsequently, friction stir welding is performed on the fixed joint members. Moreover, friction stir welding is also performed on the front side and the back side of the composite body in the case of combining joint members of the composite body (see, for example, Patent Literature 1). In this case, first, the joint members are placed on the backing plate to form the composite body, and it is fixed, and friction stir welding is then performed on the front side (first surface side) of the fixed composite body. After friction stir welding on the front side, the fixation is released, and the joint members are each turned over, re-positioned on the backing plate, and the composite body is formed again and fixed. Subsequently, friction stir welding is performed on the fixed joint members on the back side (second surface side). CITATION LIST Patent Literature Patent Literature 1: JP 2010-274320 A SUMMARY OF INVENTION Technical Problem In conventional methods, by performing friction stir welding on the front side, due to the influence of the frictional heat generated by the friction stirring, the front side of the composite body contracts, causing compressive stress on the first surface side of the composite body and tensile stress on the second surface side that is different from the first surface. When the fixation of the composite body is released in this state, due to the compressive stress and tensile stresses, the composite body undergoes deformation, curving concavely toward the front side and convexly toward the back side. Then, in the case of overturning and re-positioning the composite body whose fixation has once been released, the height and position of the site where friction stir welding is performed will change due to the deformation of the composite body from its original shape. Additionally, since each of the joint members has been deformed, there are cases where it becomes impossible to combine the joint members in their initial arrangement. In this case, the conditions of friction stir welding, such as the insertion depth and insertion position of the stirring pin of the rotary tool, may change, leading to unsatisfactory joining results. Therefore, adjustments to the insertion depth and insertion position of the stirring pin become necessary. Furthermore, attempting to correct the deformed joint members or fixing the placed joint members in order to suppress deformation can result in decreased productivity due to the required time and effort. From these perspectives, the present invention aims to provide a method for manufacturing a joined body and a joining device that can perform friction stir welding on a composite body having a first surface and a second surface that is different from the first surface, while suppressing adverse effects of deformation in the composite body caused by friction stir welding on the first surface and enabling friction stir welding on the second surface. Solution to Problem An aspect of the present invention is a method for manufacturing a joined body using a rotary tool with a stirring pin to perform friction stirring on a composite body having a first surface and a second surface that is different from the first surface, wherein in the composite body, metal members are combined together in a joined arrangement, the method comprising: an arrangement step of forming the composite body by combining the metal members in the arrangement; a fixing step of fixing the composite body in a state where the metal members are combined together; a first friction stirring step of performing friction stir welding by inserting the stirring pin through the first surface into the composite body that has been fixed; a rotating step of rotating the fixed composite body such that the second surface is in a positional relationship to face the rotary tool; and a second friction stirring step of performing friction stir welding by inserting the stirring pin through the second surface into the fixed composite body. In the method for manufacturing a joined body according to the present invention, it is preferable that in the arrangement step, the metal members are arranged such that the first surface faces the rota