JP6743643B2 - Hollow container manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a hollow container.

Patent Document 1 discloses a method for manufacturing a hollow container. The manufacturing method of the hollow container, after placing the sealing body in the opening of the hollow container body, a welding step of performing laser welding along the abutting portion of the hollow container body and the sealing body, and performing the welding step. After that, a friction stir step of performing friction stir welding using a rotary tool is performed.

JP, 2014-102895, A

In the conventional method for manufacturing a hollow container, laser welding is performed over the entire circumference of the butt portion, so that there is a problem that the heat input amount becomes large and thermal distortion occurs in the hollow container body and the sealing body.

Then, this invention makes it a subject to provide the manufacturing method of the hollow container which can reduce thermal strain.

In order to solve such a problem, the present invention is composed of a hollow container body having a bottom portion and a peripheral wall portion rising from the periphery of the bottom portion, and a sealing body for sealing the opening of the hollow container body,
A method of manufacturing a hollow container in which the hollow container main body and the sealing body are joined to each other, wherein a step of forming a step portion having a step bottom surface and a step side surface rising from the step bottom surface on an inner peripheral edge of the peripheral wall portion is prepared. A disposing step of arranging the sealing body in the hollow container main body, forming a butt portion by butting the step side surface and the side surface of the sealing body, and a rotating tool for temporary joining that rotates to the butt portion. A temporary joining step of inserting a stirring pin and performing spot temporary attachment by friction stirring in a state where only the stirring pin is in contact with the hollow container body and the sealing body, and a rotary tool for main joining that rotates to the butt portion The main stirring step of inserting the stirring pin, and moving the stirring pin only along the abutting portion in a state where only the stirring pin is in contact with the hollow container body and the sealing body to perform friction stir welding. Is characterized by.
Further, the present invention comprises a hollow container body having a bottom portion and a peripheral wall portion rising from the periphery of the bottom portion, and a sealing body for sealing the opening of the hollow container body, the hollow container body and the sealing A method of manufacturing a hollow container for joining a body, comprising: a step of forming a step portion having a step bottom surface and a step side surface rising from the step bottom surface on an inner peripheral edge of the peripheral wall portion; An arrangement step of arranging a sealing body, forming an abutting portion by abutting the step side surface and a side surface of the sealing body, a temporary joining step of performing spot temporary attachment by welding along the abutting portion, and the abutting Insert the stirring pin of the rotating tool for main welding that rotates into the section, and move only the stirring pin in contact with the hollow container body and the sealing body along the abutting portion to perform friction stir welding. seen including a main bonding step, the performing, the present bonding process, wherein around the sealing body of this joining rotation tool are relatively moved, plasticized region formed in the moving locus of the rotary tool for the joint The friction stir welding is performed so that the starting end and the ending end of the are overlapped with each other, and the rotary tool for main welding is disengaged on the butting portion .

According to this manufacturing method, since the temporary joining process is performed by spot temporary attachment, the heat input amount can be reduced. Also, since the friction stir welding is performed using only the stirring pin even in the main joining step, the heat input amount can be reduced. Thereby, the thermal strain can be reduced synergistically. Moreover, since the temporary joining process is performed by spot temporary attachment, the temporary joining process can be performed in a short time. Further, in the main joining step, friction stir welding can be performed to a deep position without applying a large load to the friction stirrer.

The rotary tool for temporary joining is preferably the same as the rotary tool for main joining. As a result, it is not necessary to replace the rotary tool in the temporary joining process and the main joining process, so that the working time can be further shortened.

Further, it is preferable that the rotary tool for main joining has a stirring pin longer than the thickness of the sealing body, and in the main joining step, friction stir welding is performed over the entire length in the depth direction of the abutting portion. .. According to this manufacturing method, the watertightness and airtightness of the hollow container can be improved.

Moreover, it is preferable to perform MIG welding, TIG welding, or laser welding in the temporary joining step.

According to the method for manufacturing a hollow container according to the present invention, thermal strain can be reduced.

It is a perspective view showing a preparation process and an arrangement process of a manufacturing method of a hollow container concerning a first embodiment of the present invention. It is a perspective view which shows the temporary joining process of the manufacturing method of the hollow container which concerns on 1st embodiment. It is sectional drawing which shows the temporary joining process of the manufacturing method of the hollow container which concerns on 1st embodiment. It is a perspective view which shows the main joining process of the manufacturing method of the hollow container which concerns on 1st embodiment. It is sectional drawing which shows the main joining process of the manufacturing method of the hollow container which concerns on 1st embodiment. It is a perspective view which shows the temporary joining process of the manufacturing method of the hollow container which concerns on 2nd embodiment of this invention.

[First embodiment]
A method for manufacturing a hollow container according to the first embodiment of the present invention will be described in detail with reference to the drawings. In the hollow container manufacturing method according to the present embodiment, as shown in FIG. 1, a metal hollow container 1 having a hollow portion is formed. In the method for manufacturing a hollow container, a preparation step, an arrangement step, a temporary joining step, and a main joining step are performed.

The preparation step is a step of preparing the hollow container body 2 and the sealing body 3, as shown in FIG. The hollow container body 2 is a box-shaped body that is open upward. The hollow container main body 2 is composed of a rectangular plate-shaped bottom portion 10 and a rectangular frame-shaped peripheral wall portion 11 rising from the peripheral edge of the bottom portion 10. A step portion 12 having a step bottom surface 12 a and a step side surface 12 b rising from the step bottom surface 12 a is formed on the inner peripheral edge of the peripheral wall portion 11. A recess 13 is formed inside the hollow container body 2.

The sealing body 3 is a rectangular plate-shaped member. The sealing body 3 is sized so as to be disposed in the step portion 12 with substantially no space. The plate thickness of the sealing body 3 is substantially equal to the height dimension of the step side surface 12b. The hollow container body 2 and the sealing body 3 are formed of a friction stirrable metal such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy, or the like. Although the hollow container body 2 and the sealing body 3 may be made of different materials, they are made of the same material in this embodiment.

The placement step is a step of placing the sealing body 3 on the step bottom surface 12a. When the sealing body 3 is arranged on the step bottom surface 12a, the step side surface 12b and the side surface 3c of the sealing body 3 are butted with each other to form a butt portion J1 (see FIG. 2). Further, when the sealing body 3 is arranged on the step bottom surface 12a, the end surface 11a of the peripheral wall portion 11 and the surface 3a of the sealing body 3 are flush with each other.

The temporary joining step is a step of temporarily joining the hollow container body 2 and the sealing body 3 by friction stirring. In the temporary joining step, the rotary tool F is used to perform the temporary joining. As shown in FIG. 2, the rotary tool F includes a connecting portion F1 and a stirring pin F2. The rotary tool F is made of, for example, tool steel. The connecting portion F1 has a columnar shape and is a portion connected to the rotating shaft of the friction stirrer.

The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1. The length of the stirring pin F2 is larger than the plate thickness of the sealing body 3. A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In this embodiment, since the rotary tool F is rotated clockwise, the spiral groove is formed counterclockwise from the base end toward the tip.

When the rotary tool F is rotated counterclockwise, it is preferable to form the spiral groove clockwise from the base end toward the tip. By setting the spiral groove in this way, the metal that has been plastically fluidized during frictional stirring is guided to the tip side of the stirring pin F2 by the spiral groove. As a result, the amount of metal overflowing to the outside of the metal members to be joined (hollow container body 2 and sealing body 3) can be reduced.

As shown in FIGS. 2 and 3, in the temporary joining step, spot temporary attachment is performed by friction stirring using a rotary tool F (rotary tool for temporary joining). In the temporary joining step, only the stirring pin F2 of the rotating tool F rotated clockwise is shallowly inserted into the abutting portion J1, and the spot temporary joining step is performed along the abutting portion J1. By the temporary joining process, the plasticized regions W1 are formed at predetermined intervals.

The main joining step is, as shown in FIGS. 4 and 5, a step of full-scale friction stir welding of the abutting portion J1. Although different rotary tools may be used for the temporary joining step and the main joining step, in the present embodiment, the rotary tool F (rotary tool for main joining) is used as in the temporary joining step. In the main joining step, the rotating tool F is relatively moved along the abutting portion J1 in a state where only the stirring pin F2 of the rotating tool F rotating clockwise is brought into contact with the hollow container body 2 and the sealing body 3. By setting the insertion depth so that the tip of the stirring pin F2 reaches the step bottom surface 12a, the entire length of the abutting portion J1 in the depth direction can be joined.

A plasticized region W2 is formed on the movement trajectory of the rotary tool F. In the main joining step, the rotary tool F is relatively moved around the sealing body 3 so that the start end and the end of the plasticized region W2 overlap. The rotary tool F may be detached from the metal member to be joined on the abutting portion J1, or may be detached on the end surface 11a of the peripheral wall portion 11.

After the main joining process is completed, a burr removing process for removing burrs formed around the plasticized region W2 may be performed. Thereby, the hollow container 1 can be finished neatly.

According to the method for manufacturing the hollow container according to the present embodiment described above, the temporary joining process is performed by spot temporary attachment, so that the heat input amount can be reduced. Also, since the friction stir welding is performed using only the stirring pin F2 also in the main joining step, the heat input amount can be reduced. Thereby, the thermal strain of the hollow container body 2 and the sealing body 3 can be synergistically reduced. Moreover, since the temporary joining process is performed by spot temporary attachment, the temporary joining process can be performed in a short time. Further, in the main joining step, the friction stir welding can be performed to the deep position of the abutting portion J1 without applying a large load to the friction stirrer.

Further, if the same rotary tool is used in the temporary joining step and the main joining step as in the present embodiment, it is not necessary to replace the rotary tool in each step, so that the working time can be further shortened.

Further, it is preferable that the rotary tool F has a stirring pin F2 that is longer than the thickness of the sealing body 3, and that in the main joining process, friction stir welding is performed over the entire length of the abutting portion J1 in the depth direction. In this embodiment, since the stirring pin F2 is inserted up to the position reaching the bottom surface 12a of the step, the overlapping portion where the bottom surface 12a of the step and the back surface 3b of the sealing body 3 are overlapped can be friction stir welded. Thereby, the watertightness and airtightness of the hollow container 1 can be improved. Further, by performing the temporary joining process, it is possible to prevent the opening of the abutting portion J1 during the main joining process.

[Second embodiment]
Next, a method of manufacturing the hollow container according to the second embodiment of the present invention will be described. In the method for manufacturing a hollow container according to the second embodiment, a preparation step, an arrangement step, a temporary joining step, and a main joining step are performed. The method of manufacturing the hollow container according to the second embodiment is different from the first embodiment in the temporary joining process. The preparation process, the placement process, and the main joining process are the same as those in the first embodiment, and thus the description thereof will be omitted.

As shown in FIG. 6, the temporary joining step is a step of temporarily joining the hollow container body 2 and the sealing body 3 by welding. In the temporary joining process, spot welding is performed by laser welding using a welding torch H. In the temporary joining process, the welding torch H is brought close to the abutting portion J1 and the spot temporary joining process is performed in a spot shape along the abutting portion J1. The welding marks W3 are formed at predetermined intervals by the temporary joining process. The type of welding is not particularly limited, but laser welding, TIG welding or MIG welding can be performed. The same effects as the first embodiment can also be achieved by the second embodiment described above.

Although the embodiments of the present invention have been described above, the design can be changed as appropriate within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Hollow container 2 Hollow container main body 3 Sealing body 3a Front surface 3b Rear surface 3c Side surface 10 Bottom portion 11 Peripheral wall portion 11a End face 12 Step portion 12a Step bottom surface 12b Step side surface 13 Recess F Rotating tool (rotating tool for main joining, rotating tool for temporary joining) )
F2 Stirring pin J1 Butt part W1 Plasticized region W2 Plasticized region

Claims (6)

A hollow container body having a bottom portion and a peripheral wall portion rising from the periphery of the bottom portion, and a sealing body that seals the opening portion of the hollow container body, and a hollow body that joins the hollow container body and the sealing body. A method of manufacturing a container,
A preparatory step of forming a step portion having a step bottom surface and a step side surface rising from the step bottom surface on an inner peripheral edge of the peripheral wall portion;
An arrangement step of arranging the sealing body in the hollow container body and forming a butt portion by abutting the step side surface and the side surface of the sealing body,
A temporary joining step of inserting a stirring pin of a rotating temporary joining rotating tool into the butt portion, and performing spot temporary attachment by friction stirring with the stirring pin alone in contact with the hollow container body and the sealing body. ,
Insert the stirring pin of the rotating main joining rotary tool into the butt portion, and friction stir by relatively moving along the butt portion while only the stirring pin is in contact with the hollow container body and the sealing body. A method of manufacturing a hollow container, comprising: a main joining step of joining. The method for manufacturing a hollow container according to claim 1, wherein the rotary tool for temporary joining is the same as the rotary tool for main joining. The rotary tool for main joining has a stirring pin longer than the thickness of the sealing body,
The method for manufacturing a hollow container according to claim 1 or 2, wherein in the main joining step, friction stir welding is performed over the entire length in the depth direction of the butt portion. A hollow container main body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the hollow container main body, and a hollow for joining the hollow container main body and the sealing body. A method of manufacturing a container,
A preparatory step of forming a step portion having a step bottom surface and a step side surface rising from the step bottom surface on an inner peripheral edge of the peripheral wall portion;
An arrangement step of arranging the sealing body in the hollow container body and forming a butt portion by abutting the step side surface and the side surface of the sealing body,
A temporary joining step of performing spot temporary attachment by welding along the abutting portion,
Insert the stirring pin of the rotating rotary tool for main joining into the butt portion, and frictionally stir by relatively moving along the butt portion while only the stirring pin is in contact with the hollow container body and the sealing body. and the bonding step of performing the joining, only including,
In the main joining step, the main joining rotary tool is relatively moved around the sealing body so that the start end and the end of the plasticizing region formed in the movement trajectory of the main joining rotary tool overlap. A method for manufacturing a hollow container, characterized in that friction stir welding is performed and the rotary tool for main welding is disengaged on the butt portion . The method for producing a hollow container according to claim 4, wherein MIG welding, TIG welding, or laser welding is performed in the temporary joining step. The rotary tool for main joining has a stirring pin longer than the thickness of the sealing body,
The method for producing a hollow container according to claim 4 or 5, wherein in the main joining step, friction stir welding is performed over the entire length in the depth direction of the butt portion.

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