JP2011183408A - Friction joined body of sheet obtained by using rotary disk and friction joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel joined body and joining method, in which two metallic sheets to be joined are stacked and fully strongly joined without producing burrs as seen in conventional friction joining and without producing an oxide film in a joined part. <P>SOLUTION: Regarding two metallic sheets to be joined having the same melting point or two metallic sheets in which the melting point of an upper metallic sheet is lower than that of a lower metallic sheet, the peripheral side part of a rotating columnar rotary member is pressed against the surface of the upper metallic sheet in a part to be joined of the upper and the lower metallic sheet, so that the upper and the lower metallic sheet are joined to form a joined body. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is a thin plate friction bonded body and a friction bonding method obtained by using a novel rotating disk.

  Welding was used as a means of integrating two or more members. In arc welding, an arc is generated between an electrode and a member, and the member is partially melted and joined by heat energy. Since the welded part is formed as a cast structure in the molten state, the joint strength is reduced, it is likely to be softened due to the thermal effect around the welded part, and weld-specific defects such as porosity and solidification cracking are likely to occur. Is done.

The conventionally known friction joining method is a joining method in which a rotating member is pressed against a metal surface to be joined to pressurize it, and the metal is heated without melting by friction heat and solid phase joining is performed.
Since it does not melt at the time of joining, the state of the joint is not the state seen in arc welding, but is expected as a method for solving the problems of arc welding. The present inventors have completed the invention for joining in which the overlapped plate members are frictionally bonded by superimposing thin metal plates and rotating in a state where a disk-shaped rotating member is pressed against the surface of one of the metal plate members. (Unexamined-Japanese-Patent No. 2003-31440 patent document 1). This joining method is solid-phase joining, and without forming a molten state, the metal plate placed underneath is pushed through the metal plate placed above (in the state of being pressed), and the solid-phase joining is performed. It is formed. Heat is generated by friction. The temperature of the joint is not high enough to be in a molten state.
In the invention of Japanese Patent Application Laid-Open No. 2001-314981 (Patent Document 2), the front end of a flat rotor is pressed against the surface of the first metal member, and then the rotor is rotated to rotate the first metal. The joining portion of the member is agitated by friction in a non-molten state to form a non-melting stirring layer, and the non-melting stirring layer is expanded to the second metal member to join the first and second metal members. State that. The event that occurs is joining as a molten state, and it is not occurring that the joining portion of the first metal member is agitated by friction in a non-molten state to form a non-melting stirring layer. The present inventors are different in the joining method. What the present inventors have confirmed by the friction welding method is that the structure of the joint is different from the state seen in conventional arc welding, and the state of the solid-layer metal plate is maintained. It is not vulnerable. It was confirmed that the temperature when joining the aluminum alloy was about 500 ° C.

  In the conventional friction welding method, the surface of the metal plate to be joined placed on the upper surface is pressed against the metal surface while rotating the cylindrical rotating body, and as a result, the force applied to the metal plate during joining Will cause the bottom surface of the rotating body to make a circular motion on the metal surface, and the force applied to the metal surface will be opposite in the left and right directions, and the structure at the time of bonding will be asymmetric. Then, burrs are generated on one side. This remains a problem. The inventors of the present invention invented a cylindrical rotating member as an overlap friction welding of metal plate materials without generation of burrs (Re-Table 2005/0920558). In this case, the top portion is formed in a flat shape, the top portion of the large diameter portion is coaxial with the large diameter portion, is a concentric circle whose diameter is shorter than the top portion, is flat, and has a height. Is at least a structure having a small-diameter portion in the shape of a cylinder or a semi-cone having a height equal to or less than the thickness of one plate to be joined, and prevents burrs. When the conventional bottom surface rubs the metal surface with a flat cylindrical rotating member, the force applied to the metal surface is opposite in the left and right directions, and the structure at the time of joining becomes asymmetric. Then, burrs are generated on one side.

A cylindrical rotor (probe) made of a material harder than the material to be processed was inserted into the joint surface where the materials to be processed to face each other and brought into contact with each other. A friction stir welding method (FSW) in which the periphery of the joining surface is heated and melted to join is known (Japanese Patent Publication No. 7-505090 (Patent Document 4), Japanese Patent Laid-Open No. 10-180466 ( Patent Document 5)).
This joining method is a method of joining dissimilar materials with different deformation resistances, it is difficult to control the temperature peak position and temperature, and if it deviates even a little, dissimilar materials having a high melting point are difficult to deform, whereas dissimilar materials having a low melting point. As a result, there was a problem that sufficient agitation was not performed, and as a result, sufficient joints could not be obtained. In this method, the materials to be joined are opposed to each other to form a joined surface, and the rotating member is pressed against the portion of the metal surface to be joined as described by the present inventors. It differs from the method of joining by the frictional heat which generate | occur | produces the surface.

A plurality of metal members (aluminum member and copper member) are arranged so as to overlap each other in the descending order of the melting point, and the peripheral surface of the tool body of the disk-shaped joining tool that rotates in the circumferential direction is arranged at the overlapping portion. The plurality of metal members (aluminum member, copper member) by moving along the surface of the metal member (copper member 2) while being pushed into the surface of the metal member (copper member) having the highest melting point among the metal members Metal member joining method for joining together (Patent Document 6, Japanese Patent Laid-Open No. 2008-012593).
The tool main body is moved along the surface of the copper member while rotating at a high speed in the circumferential direction in a state where the peripheral surface is pushed into the surface of the copper member by a certain amount. An oxide film is formed on the overlapping surface (boundary surface) of the aluminum member and the copper member. It is necessary to divide and break the oxide film on the overlapping surface (boundary surface) of the aluminum member and the copper member by causing vibration caused by contact between the tool body rotating at high speed and the copper member.
When the welding tool is pressed from the aluminum member side, the melting point of the aluminum member is lower than the melting point of the copper member 2, and the temperature (eutectic temperature) at which the overlapping surface (boundary surface) of the aluminum member and the copper member is required. : 548 ° C), since the deformation resistance of the aluminum member becomes relatively small, the pressing force by the joining tool is not sufficiently transmitted to the overlapping surface (boundary surface) of the aluminum member and the copper member 2 It is said that it is easy to become a joint defect. Inherently, it is not preferable to adopt a high temperature at which the eutectic temperature is reached and many compounds are produced. Without high temperature, it is not necessary to give vibration. This is the problem (Japanese Patent Laid-Open No. 2008-221339 (Patent Document 7), Japanese Patent Laid-Open No. 2003-275875 (Patent Document 8), Japanese Patent Laid-Open No. 2003-230968 (Patent Document 9)). JP 2003-146239 A (Patent Document 10), JP 2004-88014 A (Patent Document 11)

  When two metal plates to be joined are overlapped and joined, when a rotating member is brought into contact with the metal plate and friction joined, a by-product such as an oxide film is not generated at the joining portion, and a burr that can be sufficiently joined. There is a need for a metal plate assembly and a joining method for joining without generation.

JP 2003-31440 A JP 2001-314981 A Table 2005/0920558 JP 7-505090 Gazette JP-A-10-180466 JP 2008-12593 A JP 2008-221339 A JP 2003-275875 A JP 2003-230968 A JP 2003-146239 A JP 2004-88014 A

  The object of the present invention is to overlap two metal plates to be joined together, so that the burrs found in conventional friction welding do not occur, and no oxide film is generated at the joint, so that the two metal plates are sufficiently strong. It is an object of the present invention to provide a novel joined body and a joining method.

The present inventors diligently researched about the above problems, and found the following to complete the invention.
Two metal plates with the same melting point to be joined, or two metal plates whose upper metal plate has a lower melting point lower than that of the lower metal plate, the upper metal plate and the lower metal The upper metal plate can be brought to a melting point or a state close to the melting point by pressing the peripheral side portion of the rotating cylindrical rotating member against the surface of the upper metal plate of the part to be joined. The temperature of the lower metal plate can be increased in the same manner as that of the upper metal plate, and the strength of the upper and lower metal plates can be increased without the formation of an oxide film as seen in the conventional friction vibration bonding method. In this case, there is no burrs as seen in conventional friction welding, and there is no oxide film on the joint between the upper and lower metal plates seen in friction vibration welding. Finding that the bonding strength can be obtained, Invention was allowed to complete.
According to the present invention, the following inventions are provided.
(1) Two overlapping metal plates in which the melting point of the upper metal plate to be joined is the same as that of the lower metal plate, or the lower metal plate having the melting point of the upper metal plate to be joined The peripheral side portion of the rotating cylindrical rotating member on the surface of the upper metal plate portion of the portion to be joined of the two metal plates selected from the superposed two metal plates, which is lower than the melting point of A bonded body in which metal plates are overlapped and bonded to each other, wherein two metal plates are friction-welded by pressing the upper metal plate to rub against each other.
(2) Two superposed metal plates in which the melting point of the upper metal plate to be joined is the same as that of the lower metal plate, or the lower metal plate having the melting point of the upper metal plate to be joined It is the surface of the upper metal plate part of the part to be joined of two metal plates selected from two superposed metal plates that are lower than the melting point of, and tries to join the upper and lower metal plates Along the surface of the upper metal plate of the part, the peripheral side portion of the rotating cylindrical rotating member is pressed and moved, and the upper metal plate is rubbed, so that the two metal plates are friction-welded. A joined body in which metal plates are overlapped and joined.
(3) Two overlapping metal plates in which the melting point of the upper metal plate to be joined is the same as that of the lower metal plate, or the lower metal plate having the melting point of the upper metal plate to be joined It is the surface of the upper metal plate part of the part to be joined of two metal plates selected from two superposed metal plates that are lower than the melting point of, and tries to join the upper and lower metal plates Press the peripheral side of the rotating cylindrical rotating member along the surface of the upper metal plate part of the part, move the base that fixes the upper and lower metal plates, and move the upper metal plate A joined body in which metal plates are overlapped and joined by friction, and two metal plates are friction-welded.
(4) Two superposed metal plates in which the melting point of the upper metal plate to be joined is the same as that of the lower metal plate, or the lower metal plate having the melting point of the upper metal plate to be joined The peripheral side portion of the rotating cylindrical rotating member on the surface of the upper metal plate portion of the portion to be joined of the two metal plates selected from the superposed two metal plates, which is lower than the melting point of A method of joining two metal plates in an overlapped manner, wherein the two metal plates are friction-welded by pressing the upper plate and rubbing the upper metal plate.
(5) Two overlapping metal plates in which the melting point of the upper metal plate to be joined is the same as that of the lower metal plate, or the lower metal plate having the melting point of the upper metal plate to be joined It is the surface of the upper metal plate part of the part to be joined of two metal plates selected from two superposed metal plates that are lower than the melting point of, and tries to join the upper and lower metal plates Press the peripheral side of the rotating cylindrical rotating member along the surface of the upper metal plate part of the part, move the base that fixes the upper and lower metal plates, and move the upper metal plate A method of joining two metal plates in an overlapping manner, characterized in that the two metal plates are friction-welded by rubbing.
(6) Two stacked metal plates in which the melting point of the upper metal plate to be joined and the melting point of the lower metal plate are the same, or the lower metal plate having the melting point of the upper metal plate to be joined It is the surface of the upper metal plate part of the part to be joined of two metal plates selected from two superposed metal plates that are lower than the melting point of, and tries to join the upper and lower metal plates Press the peripheral side of the rotating cylindrical rotating member along the surface of the upper metal plate part of the part, move the base that fixes the upper and lower metal plates, and move the upper metal plate A method of superposing and joining two metal plates, wherein the two metal plates are friction-welded by friction.

  According to the present invention, two metal plates to be joined are overlapped, and when the cylindrical rotating member is rotated against the upper metal plate, when the side portion is pressed against the joining portion, the generated frictional heat causes The joined surfaces formed by joining the overlapped metal plates are symmetrical with respect to the joined portion formed by the rotating member, the disturbance is suppressed, and the occurrence of flash can be suppressed. It is possible to obtain a joined body made of a metal plate, a metal plate joining method, and a metal plate joining apparatus in which joining portions are formed symmetrically and are less disturbed, and generation of burrs is suppressed. It has sufficient strength without the occurrence of oxide film at the joint.

It is a figure which shows the joining apparatus of a cylindrical rotating member. It is a figure which shows the joining apparatus of a cylindrical rotating member. It is a figure which shows the metal surface of the junction part obtained by this invention. It is a figure which shows the metal surface of the junction part obtained by this invention. It is a figure which shows the metal surface of the junction part obtained by this invention. It is a figure which shows the result by carrying out the friction welding of the joint surface with the conventional rotary disk. It is a figure which shows the case of upward joining when the rotation direction and feed direction of a rotary disk become the same, and the case where it becomes reverse, and downward joining. It is a figure which shows the state of a junction part. It is a figure which shows the macroscopic structure of a joint cross section. It is a figure which shows a microscopic condition. It is a figure which shows the result of the tensile shear test when the width | variety of a test piece is 30 mm.

The present invention is a joined body composed of stacked metal plates formed by any one of the following three methods.
(1) When joining only one point (2) Cylindrical rotation of the metal plate on the surface of the superposed metal plate along the portion to be joined of the metal plate on the surface of the superposed metal plate When rotating while rotating the side peripheral part of the member pressed against the metal plate (3) Move the part to be joined of the metal plate on the surface of the overlapped metal plate to move the side part of the cylindrical rotary member When rotating the metal plate pressed against the metal plate and joining the metal plates stacked by frictional heat generated

The metal plates to be overlaid in order to obtain the joined body are as follows.
The member used for joining the metal plates of the present invention is a thin metal plate. These members are metal plates, and plate materials such as an aluminum plate, an aluminum alloy plate, a magnesium plate, a magnesium alloy plate, a copper plate, and a steel plate can be used.

The metal plates to be joined are overlapped and used.
When overlapping metal plates, the following is performed.
(1) Two superposed metal plates in which the melting point of the upper metal plate to be joined and the melting point of the lower metal plate are the same,
Specifically, an aluminum plate and an aluminum plate, an aluminum alloy plate and an aluminum alloy plate, a magnesium plate and a magnesium plate, a magnesium alloy plate and a magnesium alloy plate, a copper plate and a copper plate, and a steel plate and a steel plate.
(2) Two stacked metal plates in which the melting point of the upper metal plate to be joined is lower than the melting point of the lower metal plate. Specifically, when the upper metal plate is an aluminum plate, the lower metal plate is an aluminum alloy plate, aluminum plate and magnesium plate, aluminum plate and magnesium alloy plate, aluminum alloy plate and magnesium alloy plate, aluminum plate and copper plate Aluminum alloy plate and steel plate, aluminum alloy plate and copper plate, aluminum alloy plate and steel plate, magnesium alloy plate and copper plate, magnesium alloy plate and steel plate.

  The thickness of the plate material is not particularly limited as long as the frictional heat necessary for joining generated by the rotation of the rotating member is transmitted to the joining surface, but is usually 2 mm or less, It is fully applicable. Regarding the lower limit, any thickness can be adopted as long as it can withstand the rotation of the rotating member without disturbing the rotation. In general, the thickness of about 1.0 mm used in the industry or the thickness of about 0.5 mm or less is sufficiently applicable. Below, joining of an aluminum alloy sheet is explained. The same can be done for other materials.

A rotary tool can be used as the cylindrical rotary member pressed against the plate material. The material constituting the cylindrical rotary member pressed against the plate material is made of a material having higher hardness than the plate material to be joined.
In the case of an aluminum alloy plate, a rotating member made of steel or stainless steel can be used. In addition, materials made of wear-resistant materials such as tungsten, tungsten carbide, graphite, silicon carbide, alumina, and high alloy materials are used.

In order to frictionally weld the plate material, the rotating member is pressed against the surface of one plate material, and the rotating member is rotated at a required speed to generate the frictional heat generated at that time, which is used for friction welding. is there.
The amount of heat generated by friction is given as the product of the coefficient of friction between the plate material and the rotating member, the rotation speed, and the pressure when the rotating member is pressed against the plate material.
The rotation speed of the rotating member is generally in the range of about 500 to 6000 rpm.
The pressure with which the rotating member presses the plate material is about 0.5 to 5 kg / mm ² . The pressure with which the rotating member presses the plate material represents the push-in amount as equivalent to the pressure with which the rotating member is pressed into the surface plate material during operation.
The pushing amount is about 0.3 mm with respect to the thickness of 1 mm. In the case of 2 mm, it is about 0.8 mm. In the case of 0.3 mm, it is about 0.1 mm.
The time required for joining is 4 seconds or less, preferably 2 seconds or less, and is set in a range of 0.05 seconds or more when the part to be joined is joining at one place.
If the part to be joined is a joint of a specific length, the joining time is determined by determining how many times the part of the metal plate on the surface of the superposed metal plate is to be joined. The width of the part to be joined is determined according to the length of the side surface of the rotating member.
The moving speed (m / s) of the cylindrical rotating member is 0.1 to 5 m / s.
When the pedestal for fixing the metal plate is moved, the moving speed (m / s) of the metal plate to be joined is 0.1 to 5 m / s. Generally, the rotating member has a diameter in the range of about 50 to 100 mm. The side of the cylindrical rotating member is 5 to 15 mm.
By using a cylindrical rotary member having a large diameter, it is possible to join a long joint with a short joint time. As the columnar side portion, in addition to the columnar shape, those having a concave portion in the center, those having a step, and the like can be used. In the case where the joint portion is a circle, a conical shape having a different diameter in consideration of the direction of the curve may be used.
The device can be a horizontal milling machine.

By rubbing the surface of the upper metal plate, the expected temperature of the joint of the metal plate is 400 to 500 ° C. These are cases where the upper metal plate uses aluminum or an aluminum alloy.
In the case of using a magnesium plate or a magnesium alloy plate, it becomes a little higher, and becomes about 500 to 550 ° C. Higher temperatures for copper and iron. 1000 ℃

Below, the manufacturing method of the joined_body | zygote obtained by this invention is demonstrated using FIG. 1 and 2. FIG.
(1) When joining only one point Two superposed sheets in which the melting point of the upper metal plate to be joined (the metal plate placed on the surface of the metal plate 1) and the melting point of the lower metal plate 1 are the same The metal plate or the upper metal plate to be joined (the metal plate placed on the surface of the metal plate 1) has a melting point lower than the melting point of the lower metal plate 1 The upper metal plate is pressed by pressing the circumferential side portion of the rotating cylindrical rotating member 9 to the surface (the portion sandwiched by the fixing means 2) where the upper and lower metal plates are to be joined. To join the two metal plates.
A portion 4 which is the surface of the upper metal plate of the two metal plates overlapped and to which the upper and lower metal plates are to be joined is formed between the fixing means 2. The upper and lower metal plates are fixed by the base 3 and the fixing means 2.
The rotary shaft 7 is rotated by the cylindrical rotary member driving mechanism 10, and the surface of the upper metal plate is pressed by the peripheral side portion of the rotating cylindrical rotary member by the side portion of the cylindrical rotary member of the cylindrical rotary member. The upper metal plate is rubbed to join the two metal plates. In this case, the part to be joined is limited to a specific part.

The joined body joined by the above joining method is as follows.
The melting point of the upper metal plate to be joined is the same as the melting point of the lower metal plate, or the melting point of the two overlapping metal plates or the upper metal plate to be joined is higher than the melting point of the lower metal plate. Press the circumferential side part of the rotating cylindrical rotating member against the surface of the upper part of the metal plate part of the part to be joined of the two metal plates selected from the two low metal plates A joined body in which an upper metal plate is rubbed and a metal plate in which two metal plates are friction-welded is overlapped and joined.

(2) Press the side peripheral part of the cylindrical rotary member against the metal plate along the part of the metal plate on the surface of the overlapped metal plate to be joined along the portion to be joined. The upper metal plate to be joined (the metal plate placed on the lower metal plate 1) and the lower metal plate 1 have the same melting point and are overlapped. The two metal plates, or the two metal plates that are to be joined (the metal plate that is placed on the lower metal plate 1) are lower than the melting point of the lower metal plate. The surface of the upper metal plate of the metal plate, and the cylindrical rotating member 8 rotating along the portion (the portion sandwiched by the fixing means 2) where the upper and lower metal plates are to be joined. Press and move the peripheral side 9 to rub the upper metal plate Then, a method in which two metal plates are joined by overlapping metal plates on which friction welding is performed.
A portion 4 which is the surface of the upper metal plate of the two metal plates overlapped and to which the upper and lower metal plates are to be joined is formed between the fixing means 2. The upper and lower metal plates are fixed by the base 3 and the fixing means 2.
The rotary shaft 7 is rotated by the cylindrical rotary member driving mechanism 10, and the surface of the upper metal plate is pressed by the peripheral side portion of the rotating cylindrical rotary member by the side portion of the cylindrical rotary member of the cylindrical rotary member. Along the portion to be joined between the upper and lower metal plates (the portion sandwiched by the fixing means 2), the peripheral side portion 9 of the rotating cylindrical rotating member 8 is pressed and moved, The two metal plates are joined by rubbing the upper metal plate. In this case, the part to be joined is limited to a specific part.

The joined body joined by the above joining method is as follows.
The melting point of the upper metal plate to be joined is the same as the melting point of the lower metal plate, or the melting point of the two overlapping metal plates or the upper metal plate to be joined is higher than the melting point of the lower metal plate. It is the surface of the upper part of the metal plate that is the upper part of the part to be joined of the two metal plates selected from the two superposed metal plates, and the upper part of the part to be joined of the upper and lower metal plates. A metal plate in which two metal plates are friction-welded by pressing and moving the circumferential side portion of the rotating cylindrical rotating member along the surface of the metal plate to rub the upper metal plate. A joined body that is overlapped and joined.

FIG. 3 shows the state of the joined portion of the surface of the portion to be joined of the upper metal plate with respect to the joined body (material: 6061 aluminum alloy, the rotational speed of the cylindrical rotating member is 1760 rpm).
According to the present invention, two metal plates to be joined are overlapped, and when the cylindrical rotating member is rotated against the upper metal plate, when the side portion is pressed against the joining portion, the generated frictional heat causes It can be seen that the joined surfaces formed by joining the overlapped metal plates are symmetrical with respect to the joined portion formed by the rotating member, the disturbance is suppressed, and the generation of burrs can be suppressed. Further, it can be seen that the joining portion does not exceed the melting point formed by friction welding, so that it has sufficient strength without generation of an oxide film.

(3) Move the portion of the metal plate to be joined on the surface of the superposed metal plate, rotate the side of the cylindrical rotating member pressed against the metal plate, and superimpose it by the generated frictional heat. When the upper metal plate to be joined (the metal plate placed on the lower metal plate 1) and the lower metal plate 1 have the same melting point, the two overlapping metal plates are joined together. Two superposed metal plates whose melting point is lower than that of the lower metal plate or the upper metal plate to be joined (the metal plate placed on the lower metal plate 1) The surface of the upper metal plate, and the portion of the upper and lower metal plates to be joined (the portion sandwiched by the fixing means 2) is moved to move around the rotating cylindrical rotating member 9 Press the side to rub the upper metal plate and Join metal plates.
A portion 4 which is the surface of the upper metal plate of the two metal plates overlapped and to which the upper and lower metal plates are to be joined is formed between the fixing means 2. The upper and lower metal plates are fixed by the base 3 and the fixing means 2. Move the pedestal in the direction of travel.
The rotary shaft 7 is rotated by the cylindrical rotary member driving mechanism 10, and the surface of the upper metal plate is pressed by the peripheral side portion of the rotating cylindrical rotary member by the side portion of the cylindrical rotary member of the cylindrical rotary member. The upper metal plate is rubbed to join the two metal plates. In this case, the part to be joined is limited to a specific part.

The joined body joined by the above joining method is as follows.
The melting point of the upper metal plate to be joined is the same as the melting point of the lower metal plate, or the melting point of the two overlapping metal plates or the upper metal plate to be joined is higher than the melting point of the lower metal plate. It is the surface of the upper part of the metal plate that is the upper part of the part to be joined of the two metal plates selected from the two superposed metal plates, and the upper part of the part to be joined of the upper and lower metal plates. Along the surface of the metal plate part, press the peripheral side of the rotating cylindrical rotating member, move the base that fixes the upper and lower metal plates, and rub the upper metal plate A joined body in which two metal plates are friction-welded and joined together.

Regarding the joined body, the state of the joint portion on the surface of the portion to be joined of the upper metal plate is substantially the same as in the case of (2).
Hereinafter, the present invention will be described specifically by way of examples.

Material material, dimensions (thickness, joint width) 6061 aluminum alloy (thickness: 1 mm, joint length 130 mm)
Metal plate moving speed 1mm / s
Length of part to be joined: 130mm
Time required for joining: 130 seconds Shape and material of cylindrical rotating member: SK material diameter 100 mm, thickness 10 mm
Cylinder-shaped rotating member is pushed in by 0.3 mm (the pressure indicates the pushing pressure)
Thus, position control (push-in amount) is performed.
The shape of joining is as shown in FIG.

About the used metal plate Material material, thickness 5052 aluminum alloy thickness 0.6mm,
Length of part to be joined: 130mm
Tool width 10mm, indentation depth 0.2mm, welding speed 1mm / s
Rotational speed 1320 rpm,
FIG. 4 is a view showing the metal surface of the joint obtained in the second embodiment.

About the used metal plate Material material, thickness 5052 aluminum alloy thickness 0.6mm,
Length of part to be joined: 130mm
Tool width 10mm, indentation depth 0.2mm, welding speed 8mm / s
Rotational speed 1320 rpm,
In addition, it has been confirmed that AZ31 and AZ61 magnesium alloys can also be joined.
FIG. 5 shows the metal surface of the joint obtained by the present invention.

The test material was a 5052-H34 aluminum alloy plate (σ _B = 262 MPa) having a thickness of 0.6 mm.
, δ = 9%, 82HK0.05) was machined to a width of 70 mm and a length of 130 mm, and then the joint surface was degreased and washed. The joining direction is parallel to the rolling direction of the specimen, and depends on the conditions shown in Table 1 selected by preliminary experiments. The apparatus used was a horizontal milling machine. The material to be joined was fixed so that the allowance was 30 mm. The tool material was made of SUS304 stainless steel and machined to a joint width of 10 mm and a diameter of 100 mm. It is conceivable that a difference may occur depending on the combination of the rotating direction and the feeding direction of the rotating disk at the time of joining. FIG. 7 shows the case of upward bonding (Up-Welding) 12 when the rotation direction and the feeding direction of the rotating disk are the same, and the case of downward bonding (Down-Welding) 13 when it is opposite.

In the upward bonding 12, the bonded portion was smooth regardless of the bonding speed. In the downward joint 13, it was observed that the material was pushed backward by the rotation of the tool. The joint became smooth as the joining speed increased, and burrs were observed at the joint end (FIG. 8). The case of 1 mm / s and 4 mm / s is shown.
The macroscopic structure of the joint cross section is shown in FIG. 9 (in the case of 4 mm / s). A joint was formed in a range slightly narrower than the range corresponding to the rotary work, and a healthy joint was obtained. The microscopic state was shown about A, B, C, and D of upward joining of FIG. 9 (FIG. 10).
FIG. 11 shows the result of a tensile shear test when the width of the test piece is 30 mm (in the case of 4 mm / s). The results of tensile shear test with high upward bonding were shown. The highest shear load was upward in this test range.

Comparative example When a metal plate is friction welded on the bottom surface of a cylindrical rotating member (conventional method of friction welding).
6061 aluminum alloy 1mm thickness overlay, tool diameter 10mm, rotation speed 2000rpm, moving speed 1mm / s, indentation depth 0.3mm (Fig. 6)
FIG. 6 shows that burrs are generated at the joint. It can also be seen that the joint is formed in an asymmetrical state.

  Regarding friction welding, the fact that it was possible to prevent the occurrence of burrs at the joints is epoch-making, and a wide variety of applications are expected as friction technology.

1: Lower metal plate 2: Fixing means 3: Pedestal 4: Joining part 5: Direction in which the metal plate is to be joined 6: Rotation driving means 7: Rotating shaft 8: Cylindrical rotating member 9: Side of cylindrical rotating member Part 10: Cylindrical rotating member driving mechanism 11: Upper metal plate 12: Upward joining 13: Downward joining

Claims (6)

  The melting point of the upper metal plate to be joined is the same as the melting point of the lower metal plate, or the melting point of the two overlapping metal plates or the upper metal plate to be joined is higher than the melting point of the lower metal plate. Press the circumferential side part of the rotating cylindrical rotating member against the surface of the upper part of the metal plate part of the part to be joined of the two metal plates selected from the two low metal plates A joined body in which two metal plates are friction-welded by rubbing an upper metal plate and the metal plates are overlapped and joined.   The melting point of the upper metal plate to be joined is the same as the melting point of the lower metal plate, or the melting point of the two overlapping metal plates or the upper metal plate to be joined is higher than the melting point of the lower metal plate. It is the surface of the upper part of the metal plate that is the upper part of the part to be joined of the two metal plates selected from the two superposed metal plates, and the upper part of the part to be joined of the upper and lower metal plates. Along the surface of the metal plate, the peripheral side portion of the rotating cylindrical rotating member is pressed and moved, and the upper metal plate is rubbed so that the two metal plates are friction-welded. A joined body in which metal plates are stacked and joined.   The melting point of the upper metal plate to be joined is the same as the melting point of the lower metal plate, or the melting point of the two overlapping metal plates or the upper metal plate to be joined is higher than the melting point of the lower metal plate. It is the surface of the upper part of the metal plate that is the upper part of the part to be joined of the two metal plates selected from the two superposed metal plates, and the upper part of the part to be joined of the upper and lower metal plates. Along the surface of the metal plate part, press the peripheral side of the rotating cylindrical rotating member, move the base that fixes the upper and lower metal plates, and rub the upper metal plate A joined body in which two metal plates are friction-welded and the metal plates are overlapped and joined.   The melting point of the upper metal plate to be joined is the same as the melting point of the lower metal plate, or the melting point of the two overlapping metal plates or the upper metal plate to be joined is higher than the melting point of the lower metal plate. Press the circumferential side part of the rotating cylindrical rotating member against the surface of the upper part of the metal plate part of the part to be joined of the two metal plates selected from the two low metal plates A method of superimposing and joining two metal plates, wherein two metal plates are friction-welded by rubbing an upper metal plate.   The melting point of the upper metal plate to be joined is the same as the melting point of the lower metal plate, or the melting point of the two overlapping metal plates or the upper metal plate to be joined is higher than the melting point of the lower metal plate. It is the surface of the upper part of the metal plate that is the upper part of the part to be joined of the two metal plates selected from the two superposed metal plates, and the upper part of the part to be joined of the upper and lower metal plates. Along the surface of the metal plate part, press the peripheral side of the rotating cylindrical rotating member, move the base that fixes the upper and lower metal plates, and rub the upper metal plate A method of superimposing and joining two metal plates, characterized by friction welding the two metal plates. The melting point of the upper metal plate to be joined is the same as the melting point of the lower metal plate, or the melting point of the two overlapping metal plates or the upper metal plate to be joined is higher than the melting point of the lower metal plate. It is the surface of the upper part of the metal plate that is the upper part of the part to be joined of the two metal plates selected from the two superposed metal plates, and the upper part of the part to be joined of the upper and lower metal plates. Along the surface of the metal plate part, press the peripheral side of the rotating cylindrical rotating member, move the base that fixes the upper and lower metal plates, and rub the upper metal plate A method of superimposing and joining two metal plates, wherein the two metal plates are friction-welded.