CN103476532B

CN103476532B - The assembly of throw unit, friction stirring connecting method, double face slab and the friction stirring connecting method of double face slab

Info

Publication number: CN103476532B
Application number: CN201280005439.2A
Authority: CN
Inventors: 堀久司; 濑尾伸城
Original assignee: Welding Institute England; Nippon Light Metal Co Ltd
Current assignee: Welding Institute England; Nippon Light Metal Co Ltd
Priority date: 2011-01-19
Filing date: 2012-01-18
Publication date: 2016-05-25
Anticipated expiration: 2032-01-18
Also published as: JPWO2012099152A1; CN103909344B; CN103909343A; TWI494184B; CN103909344A; CN103894728B; JP5864446B2; KR20140029389A; WO2012099152A1; KR101471319B1; TW201235137A; CN103909343B; CN103476532A; CN103894728A

Abstract

The invention provides a kind of throw unit, when pair of metal plate joint with twin shaft shoulder stirring head dummy instrument, can suppress the generation of joint defect. the feature of above-mentioned throw unit is, there is the keeper (303) of the tubular that is fixed on chuck portion (301), sliding axle (304) and twin shaft shoulder stir head dummy instrument (305), keeper (303) has: a pair of slotted hole (311), this a pair of slotted hole (311) radially connects and toward each other, sliding axle (304) has the alignment pin (322) being inserted in a pair of slotted hole (311) and the fixed component (323) that alignment pin (322) is fixed on to sliding axle (304), slotted hole (311) is along extending axially setting, by engaging of slotted hole (311) and alignment pin (322), sliding axle (304) and keeper (303) are rotated integratedly, and move vertically in the scope of slotted hole (311).

Description

The assembly of throw unit, friction stirring connecting method, double face slab and the friction stirring connecting method of double face slab

Technical area

The present invention relates to have twin shaft shoulder stir head dummy instrument (Japanese: ボ PVC Application Star ー Le, bobbintool) throw unit, use above-mentioned throw unit friction stirring connecting method, use above-mentioned throw unit to engage the assembly of the double face slab forming and use the friction stirring connecting method of the double face slab of above-mentioned throw.

Background technology

In the past, known have twin shaft shoulder stirring head dummy instrument to be used as the end face of metallic plate to rub each other and stir the instrument (with reference to patent documentation 1) engaging. Twin shaft shoulder stirs the threaded that head dummy kit is drawn together a pair of shaft shoulder portion and formed between above-mentioned shaft shoulder portion. In the time that pair of metal plate is engaged, fixedly make it not move metallic plate, the twin shaft shoulder of High Rotation Speed is being stirred to one end insertion of head dummy instrument from metallic plate, and threaded is moved along docking section. By this, end face separately metal around just stirred and metallic plate be engaged with each other by friction. If use twin shaft shoulder to stir head dummy instrument, because the rear side at metallic plate also has shaft shoulder portion, therefore, conventionally can omit the abutting member of the rear side that is configured in metallic plate. Particularly, in the time that the end of hollow material is engaged with each other, due to the comparatively complexity of operation of abutting member being set, therefore, can significantly save operation procedure.

On the other hand, in the past, known had double face slab overlapping two metallic plates and that form. Double face slab is as the structure of rolling stock, aircraft, ship, civil construction thing etc. As patent documentation 2 is recorded, double face slab comprise outside plate, inner panel and be folded in outside plate and inner panel between support plate. In addition, in the time that double face slab is engaged with each other, make that dock with outside plate end the outside plate end of adjacent double face slab, dock with inner panel end inner panel end, form after the assembly of double face slab, use throw that the partial frictional after docking is stirred and engaged.

Prior art document

Patent documentation

Patent documentation 1: No. 2712838 communique of Japanese Patent Laid

Patent documentation 2: Japanese Patent Laid-Open 2008-272768 communique

Summary of the invention

Invent technical problem to be solved

But, stir in joint in the friction that uses twin shaft shoulder to stir head dummy instrument, comparatively it is desirable to, the axial centre of threaded and the Centered of the short transverse of metallic plate are engaged simultaneously, but metallic plate can deform because of frictional heat sometimes. Once metallic plate deforms because of frictional heat, the center of threaded just cannot with the center-aligned of metallic plate, and cause engage bad.

In addition, larger than the thickness of metallic plate if twin shaft shoulder stirs distance between the shaft shoulder portion of head dummy instrument, stirs by friction and be easily spilled over to the outside of shaft shoulder portion by the metal after Plastic Flow, therefore, there is the such problem of easy generation joint defect.

In addition, the outer peripheral face that twin shaft shoulder stirs the threaded of head dummy instrument is carved with helicla flute sometimes, but because of the difference of spiral fluted direction or the scope of establishing quarter, exist the groove forming on the decorative cover of the metallic plate after joint to become on large or decorative cover and produce the such problem of many burr.

In addition, because double face slab is thin and long hardware, therefore, the comparatively difficulty of operation that the outside plate of a pair of double face slab is docked with inner panel accurately with outside plate, inner panel. In addition,, even if use fixture fixedly to make it not move the assembly of double face slab, also there is double face slab such problem separated from one another while making throw move to engage.

The present invention completes in view of the above problems, and its technical problem is to provide a kind of can suppress the generation of joint defect throw unit and the friction stirring connecting method that can engage ideally in the time using twin shaft shoulder stirring head dummy instrument to engage pair of metal plate. In addition, its technical problem is, in the time stirring the outer peripheral face of the threaded of head dummy instrument at twin shaft shoulder and be carved with helicla flute, can reduce the burr that produce on the decorative cover of metallic plate, or can dwindle the groove forming on decorative cover. In addition, technical problem of the present invention is to provide a kind of assembly of double face slab and friction stirring connecting method of double face slab that can ideally double face slab be engaged.

The technical scheme that technical solution problem adopts

In order to solve the problems of the technologies described above, the present invention proposes a kind of throw unit, is fixed on the chuck portion of friction agitating device, it is characterized in that having: the keeper of tubular, and the keeper of this tubular is fixed on above-mentioned chuck portion; Sliding axle, this sliding axle can be inserted into the inside of above-mentioned keeper; And twin shaft shoulder stirs head dummy instrument, this twin shaft shoulder stirring head dummy instrument is arranged on the front end of above-mentioned sliding axle, above-mentioned keeper has: a pair of slotted hole, this a pair of slotted hole radially connects, and toward each other, above-mentioned sliding axle has: alignment pin, and this alignment pin can be inserted in above-mentioned a pair of slotted hole; And fixed component, above-mentioned alignment pin is fixed on above-mentioned sliding axle by this fixed component, and above-mentioned twin shaft shoulder stirs head dummy instrument to be had: the first shaft shoulder portion, above-mentioned sliding axle is fixed in this first shaft shoulder portion; The second shaft shoulder portion, this second shaft shoulder portion and above-mentioned the first shaft shoulder portion separate; And threaded, this threaded links above-mentioned the first shaft shoulder portion and above-mentioned the second shaft shoulder portion, above-mentioned slotted hole is along extending axially setting, by engaging of above-mentioned slotted hole and above-mentioned alignment pin, above-mentioned sliding axle and above-mentioned keeper are rotated integratedly, and move vertically in the scope of above-mentioned slotted hole.

According to said structure, because the sliding axle that twin shaft shoulder stirring head dummy instrument is installed moves vertically with respect to keeper, therefore, twin shaft shoulder stirs head dummy instrument also along with the distortion of metallic plate is moved vertically. By this, can prevent from causing because of the distortion of metallic plate the position skew of bonding station, thereby, the generation of joint defect can be suppressed. In addition, the alignment pin that is fixed on sliding axle is inserted in a pair of slotted hole of keeper, therefore, can make the movement of sliding axle stable.

In addition, comparatively it is desirable to, above-mentioned sliding axle has: through hole, and this through hole connects vertically; And pin-and-hole, this pin-and-hole and above-mentioned through hole are orthogonal, insert above-mentioned alignment pin in above-mentioned pin-and-hole, insert above-mentioned fixed component in above-mentioned through hole, the front end of above-mentioned fixed component and above-mentioned alignment pin butt.

According to said structure, can alignment pin be fixed on to sliding axle with simple structure.

In addition, comparatively it is desirable to, be formed with the eel-like figure portion thinner than other parts at the central portion of above-mentioned alignment pin, the front end of above-mentioned fixed component and above-mentioned eel-like figure portion butt.

According to said structure, can be fixed alignment pin more reliably.

In addition, comparatively it is desirable to, above-mentioned twin shaft shoulder stirs head dummy instrument to be had: the first securing member, and this first securing member is by fastening distolateral and above-mentioned first shaft shoulder portion of above-mentioned threaded; And second securing member, this second securing member is by fastening another distolateral and above-mentioned second shaft shoulder portion of above-mentioned threaded, be formed with extension setting vertically and cross section in the inside of above-mentioned the first shaft shoulder portion and be non-circular the first connecting hole, be formed with extension setting vertically and cross section in the inside of above-mentioned the second shaft shoulder portion and be non-circular the second connecting hole, above-mentioned threaded has: spiral slot part, and this spiral slot part exposes between above-mentioned the first shaft shoulder portion and above-mentioned the second shaft shoulder portion; The first engaging axial region, this first engaging axial region is formed on one distolateral, and engages with above-mentioned the first connecting hole; And the second engaging axial region, this second engaging axial region is formed on that another is distolateral, and engages with above-mentioned the second connecting hole.

In addition, comparatively it is desirable to, above-mentioned twin shaft shoulder stirs head dummy instrument to be had: the first securing member, and this first securing member is by fastening distolateral and above-mentioned first shaft shoulder portion of above-mentioned threaded, and second securing member, this second securing member is by fastening another distolateral and above-mentioned second shaft shoulder portion of above-mentioned threaded, be formed with vertically the first screw engaging elongated hole that extends the first hole of arranging and be communicated with above-mentioned the first hole from the side of above-mentioned shaft shoulder portion in the inside of above-mentioned the first shaft shoulder portion, be formed with vertically the second screw engaging elongated hole that extends the second hole of arranging and be communicated with above-mentioned the second hole from the side of above-mentioned shaft shoulder portion in the inside of above-mentioned the second shaft shoulder portion, above-mentioned threaded has: spiral slot part, this spiral slot part exposes between above-mentioned the first shaft shoulder portion and above-mentioned the second shaft shoulder portion, the first axle part, it is one distolateral that this first axle part is formed on, and be inserted in above-mentioned the first hole, the first par, this first par is formed flatly on the outer peripheral face of above-mentioned the first axle part, the second axle part, this second axle part is formed on that another is distolateral, and is inserted in above-mentioned the second hole, and second par, this second par is formed flatly on the outer peripheral face of above-mentioned the second axle part, the first engaging screw is screwed into above-mentioned the first screw engaging elongated hole from the side of above-mentioned the first shaft shoulder portion, make front end and the above-mentioned first par butt of above-mentioned the first engaging screw, the second engaging screw is screwed into above-mentioned the second screw engaging elongated hole from the side of above-mentioned the second shaft shoulder portion, makes front end and the above-mentioned second par butt of above-mentioned the second engaging screw.

Need to change the spiral fluted degree of depth of distance between shaft shoulder portion, threaded and spacing, coiling direction etc. according to the material of the thickness of metallic plate or metallic plate. In addition,, owing to helicla flute being shoaled because of abrasion, therefore, need to change threaded. According to said structure, threaded can with the first shaft shoulder portion and the second shaft shoulder integrally, and can not rotate each other, and the first shaft shoulder portion and the second shaft shoulder portion can easily take off from threaded. By this, can easily carry out replacing or the maintenance of threaded and each shaft shoulder portion.

In addition, comparatively it is desirable to, at least one party in the lower surface of above-mentioned the first shaft shoulder portion and the upper surface of above-mentioned the second shaft shoulder portion, be formed with groove, the axle that this groove stirs head dummy instrument around above-mentioned twin shaft shoulder spirally forms.

According to said structure, can improve friction stirring efficiency.

In addition, the present invention also proposes a kind of friction stirring connecting method, use the throw unit of a first aspect of the present invention, pair of metal plate is engaged, it is characterized in that, above-mentioned friction stirring connecting method has: docking operation, in this docking operation, docks the end face of above-mentioned metallic plate each other, and bonding process, in this bonding process, make the threaded of the above-mentioned twin shaft shoulder stirring head dummy instrument of rotation move to the docking section of above-mentioned end face being docked each other to rear formation, above-mentioned end face is rubbed to stir each other and engage, in above-mentioned bonding process, in advance the distance between the first shaft shoulder portion and the second shaft shoulder portion is set as below the thickness of above-mentioned metallic plate, make above-mentioned metallic plate distortion when stirring because of friction, when head dummy instrument axially displaced stirred along above-mentioned twin shaft shoulder in the position that makes above-mentioned metallic plate, above-mentioned twin shaft shoulder stirs head dummy instrument and moves vertically along with the displacement of above-mentioned metallic plate.

According to said method, by the distance between shaft shoulder portion is set as below the thickness of metallic plate, thereby, can prevent from stirring and making metal after Plastic Flow be spilled over to the outside of shaft shoulder portion because of friction. By this, can suppress the generation of joint defect.

In addition, comparatively it is desirable to, in the time that above-mentioned end face gap is to each other set as below 1.00mm, the distance between the thickness of above-mentioned metallic plate and above-mentioned shaft shoulder portion is set for and met 0.2mm≤{ (thickness of metallic plate)-(distance between shaft shoulder portion) }≤0.8mm.

In addition, comparatively it is desirable to, above-mentioned end face gap being to each other set as being greater than 1.00mm and for below 1.75mm time, the distance between the thickness of above-mentioned metallic plate and above-mentioned shaft shoulder portion is set for and met 0.4mm≤{ (thickness of metallic plate)-(distance between shaft shoulder portion) }≤0.8mm.

According to above-mentioned joint method, even if end face exists gap to each other, also can suppress the generation of joint defect.

In addition, comparatively it is desirable to, the value of the square value of diameter of setting the face that makes in above-mentioned shaft shoulder portion, contacts with above-mentioned metallic plate for after divided by the square value of the external diameter of above-mentioned threaded is greater than 2.0.

According to above-mentioned joint method, can face in shaft shoulder portion, that contact with above-mentioned metallic plate be guaranteed very greatly with respect to the external diameter of threaded, therefore, can press the metal of Plastic Flow between shaft shoulder portion reliably. By this, can further suppress the generation of joint defect. If the value of the square value of the diameter of face in shaft shoulder portion, that contact with above-mentioned metallic plate after divided by the square value of the external diameter of above-mentioned threaded is that below 2.0, metal easily overflows, and easily produces joint defect.

In addition, comparatively it is desirable to, set for the square value of the diameter of above-mentioned shaft shoulder face portion, that contact with above-mentioned metallic plate is deducted to the value obtaining after the square value of external diameter of above-mentioned threaded, and the value of the square value of external diameter that makes above-mentioned threaded after divided by value obtained above be greater than 0.2, and the value that the square value of the external diameter of above-mentioned threaded is multiplied by after the value of stating the distance between shaft shoulder portion divided by the external diameter of above-mentioned threaded is greater than 1.2.

According to said method, if the square value of the diameter of face in above-mentioned shaft shoulder portion, that contact with above-mentioned metallic plate is deducted to the value obtaining after the square value of external diameter of threaded, and the value of the square value of external diameter that makes threaded after divided by value obtained above is below 0.2, because threaded is thinner, make tensile resistence deficiency and cause easily fractureing, if but larger than 0.2, because threaded relatively is slightly not easy to fracture.

In addition, comparatively it is desirable to, the value that the square value of the external diameter of above-mentioned threaded is multiplied by after the value of stating the distance between shaft shoulder portion divided by the external diameter of above-mentioned threaded is greater than 1.2. If above-mentioned value is below 1.2, because threaded is thinner, make fracture resistence force not enough and cause easily fractureing, if but larger than 1.2, because threaded relatively is slightly not easy to fracture.

In addition, comparatively it is desirable to, in above-mentioned bonding process, the thickness of the above-mentioned metallic plate of the part after docking is different, in the time that above-mentioned the metallic plate larger thickness of above-mentioned metallic plate is configured in to left side with respect to the direct of travel of above-mentioned twin shaft shoulder stirring head dummy instrument, make above-mentioned twin shaft shoulder stir head dummy instrument towards right rotation.

In addition, comparatively it is desirable to, in above-mentioned bonding process, the thickness of the above-mentioned metallic plate of the part after docking is different, in the time that above-mentioned the metallic plate larger thickness of above-mentioned metallic plate is configured in to right side with respect to the direct of travel of above-mentioned twin shaft shoulder stirring head dummy instrument, make above-mentioned twin shaft shoulder stir head dummy instrument towards anticlockwise.

Stir in joint in friction, in the time making throw towards right rotation, the metal of Plastic Flow has from the left side of the direct of travel of instrument (shearing side: the rotary speed of throw adds translational speed one side of throw) mobile trend in right side (flow side: the rotary speed of throw deducts translational speed one side of throw) towards instrument direct of travel, therefore, can think that hypothesis is in the situation that metallic plate exists gap to each other, the metal of shearing side can the above-mentioned gap of landfill. Therefore, if metallic plate little thickness is configured in to shearing side, the trend of the central portion less thick in the not enough and plastification region after making to engage of metal.

But, in the case of the end surface thickness of metallic plate is different, by metallic plate large thickness is disposed to shearing side, just can supplement metal deficiency, therefore, can more desirably engage.

In addition, comparatively it is desirable to, in above-mentioned bonding process, making, above-mentioned the first shaft shoulder portion is relative with the decorative cover of above-mentioned metallic plate, and after the center that makes the axial centre of above-mentioned threaded and the thickness of slab direction of above-mentioned metallic plate is aimed at, make from above-mentioned sliding axle side be viewed as the threaded that stirs head dummy instrument towards the above-mentioned twin shaft shoulder of right rotation move to above-mentioned end face is docked each other the docking section of formation, be formed with the helicla flute of right-hand thread in above-mentioned first shaft shoulder portion side of the outer peripheral face of above-mentioned threaded, the helicla flute of above-mentioned right-hand thread forms with more than 25% ratio with respect to the distance between above-mentioned the first shaft shoulder portion and above-mentioned the second shaft shoulder portion.

According to above-mentioned joint method, the right-hand thread of the first shaft shoulder portion side forms with more than 25% ratio, therefore, the metal that the helicla flute of reason right-hand thread causes moves, make twin shaft shoulder stir head dummy instrument and pressed towards sliding axle side, thereby can prevent that twin shaft shoulder stirring head dummy instrument from entering too far into the decorative cover of metallic plate. By this, can prevent from producing groove at decorative cover, even if or be formed with groove and also can reduce the degree of depth of groove.

In addition, comparatively it is desirable to, in above-mentioned outer peripheral face, from the spiral fluted end of above-mentioned right-hand thread to above-mentioned the second shaft shoulder portion, be formed with the helicla flute of left-hand thread.

According to above-mentioned joint method, can improve the stirring efficiency that friction is stirred.

In addition, comparatively it is desirable to, in above-mentioned bonding process, making, above-mentioned the first shaft shoulder portion is relative with the decorative cover of above-mentioned metallic plate, and after the center that makes the axial centre of above-mentioned threaded and the thickness of slab direction of above-mentioned metallic plate is aimed at, make from above-mentioned sliding axle side be viewed as the threaded that stirs head dummy instrument towards the above-mentioned twin shaft shoulder of anticlockwise move to above-mentioned end face is docked each other the docking section of formation, be formed with the helicla flute of left-hand thread in above-mentioned first shaft shoulder portion side of the outer peripheral face of above-mentioned threaded, the helicla flute of above-mentioned left-hand thread forms with more than 25% ratio with respect to the distance between above-mentioned shaft shoulder portion.

According to above-mentioned joint method, the left-hand thread of the first shaft shoulder portion side forms with more than 25% ratio, therefore, the metal that the helicla flute of reason left-hand thread causes moves, make twin shaft shoulder stir head dummy instrument and pressed towards sliding axle side, thereby can prevent that twin shaft shoulder stirring head dummy instrument from entering too far into the decorative cover of metallic plate. By this, can prevent from producing groove at decorative cover, even if or be formed with groove and also can reduce the degree of depth of groove.

In addition, comparatively it is desirable to, in above-mentioned outer peripheral face, from the spiral fluted end of above-mentioned left-hand thread to above-mentioned the second shaft shoulder portion, be formed with the helicla flute of right-hand thread.

In addition, comparatively it is desirable to, in bonding process, making, described the second shaft shoulder portion is relative with the decorative cover of described metallic plate, and after the center that makes the axial centre of described threaded and the thickness of slab direction of described metallic plate is aimed at, make from described sliding axle side be viewed as the threaded that stirs head dummy instrument towards the described twin shaft shoulder of right rotation move to described end face is docked each other the docking section of formation, be formed with the helicla flute of left-hand thread in above-mentioned second shaft shoulder portion side of the outer peripheral face of above-mentioned threaded, the helicla flute of above-mentioned left-hand thread forms with more than 25% ratio with respect to the distance between above-mentioned shaft shoulder portion.

According to above-mentioned joint method, the left-hand thread of the second shaft shoulder portion side forms with more than 25% ratio, therefore, the metal that the helicla flute of reason left-hand thread causes moves, make twin shaft shoulder stir head dummy instrument and pressed towards a side contrary with sliding axle, thereby can prevent that twin shaft shoulder stirring head dummy instrument from entering too far into the decorative cover of metallic plate. By this, can prevent from producing groove at decorative cover, even if or be formed with groove and also can reduce the degree of depth of groove.

In addition, comparatively it is desirable to, in above-mentioned outer peripheral face, from the spiral fluted end of above-mentioned left-hand thread to above-mentioned the first shaft shoulder portion, be formed with the helicla flute of right-hand thread.

In addition, comparatively it is desirable to, in above-mentioned bonding process, making, above-mentioned the second shaft shoulder portion is relative with the decorative cover of above-mentioned metallic plate, and after the center that makes the axial centre of above-mentioned threaded and the thickness of slab direction of above-mentioned metallic plate is aimed at, make from above-mentioned sliding axle side be viewed as the threaded that stirs head dummy instrument towards the above-mentioned twin shaft shoulder of anticlockwise move to above-mentioned end face is docked each other the docking section of formation, be formed with the helicla flute of right-hand thread in above-mentioned second shaft shoulder portion side of the outer peripheral face of above-mentioned threaded, the helicla flute of above-mentioned right-hand thread forms with more than 25% ratio with respect to the distance between above-mentioned shaft shoulder portion.

According to above-mentioned joint method, the right-hand thread of the second shaft shoulder portion side forms with more than 25% ratio, therefore, the metal that the helicla flute of reason right-hand thread causes moves, make twin shaft shoulder stir head dummy instrument and pressed towards a side contrary with sliding axle, thereby can prevent that twin shaft shoulder stirring head dummy instrument from entering too far into the decorative cover of metallic plate. By this, can prevent from producing groove at decorative cover, even if or be formed with groove and also can reduce the degree of depth of groove.

In addition, comparatively it is desirable to, in above-mentioned outer peripheral face, from the spiral fluted end of above-mentioned right-hand thread to above-mentioned the first shaft shoulder portion, be formed with the helicla flute of left-hand thread.

In addition, comparatively it is desirable to, in above-mentioned bonding process, engage the decorative cover of above-mentioned metallic plate being carried out in cooling.

According to above-mentioned joint method, by suppressing the temperature rise of metal of liquidation, can further suppress the generation of groove.

In addition, the present invention also provides a kind of assembly of double face slab, it is the throw unit that uses a first aspect of the present invention, to a pair of double face slab rub stir engage after form, it is characterized in that, hook portion on the end of outside plate of the above-mentioned double face slab that is formed on a side is engaged with the hook portion being formed on the opposing party's the end of outside plate of above-mentioned double face slab, the end face being formed on a side the end of inner panel of above-mentioned double face slab is docked with the end face of the inner panel of the opposing party's above-mentioned double face slab, and do not engage.

According to said structure, engage with each other by the hook portion that makes outside plate, just can prevent from engaging time, double face slab be separated from each other. If hook portion is also set at inner panel, the operation of double face slab docking each other will become difficulty, therefore, in the present invention, at inner panel, hook portion is not set, only by end face is docked each other. By this, can make more laborsaving the operation of the preparatory process of double face slab docking.

In addition, comparatively it is desirable to, each above-mentioned hook portion has: thinner wall section, and this thinner wall section is extended and is arranged from the heavy section of above-mentioned outside plate; And extension, this extension and above-mentioned thinner wall section are continuous, and stretch out along thickness of slab direction, and a pair of above-mentioned extension is engaged with each other.

According to said structure, can hook portion be set with simple structure.

In addition, comparatively it is desirable to, be formed with and stretch out inclined plane at the sidepiece of the above-mentioned extension of above-mentioned double face slab of the side, be formed with and above-mentioned heavy wall inclined plane of stretching out inclination plane-plane contact at the above-mentioned heavy section of the opposing party's above-mentioned double face slab.

According to said structure, owing to making inclined plane obliquely slide each other, therefore, can make double face slab easily engaging each other.

In addition, comparatively it is desirable to, between above-mentioned outside plate and above-mentioned inner panel, be folded with support plate, is being c (mm) by the length setting from above-mentioned support plate to above-mentioned end face, and when the thickness of slab of above-mentioned heavy section is set as to t (mm), meet c≤7.0 × t+18.5.

If the distance from support plate to end face is very large, exist the distortion of the end side of member to become large possibility, but according to said structure, the distortion of the end side of member diminish.

The present invention also provides a kind of friction stirring connecting method of double face slab, use the throw unit of a first aspect of the present invention, the end of a pair of double face slab is rubbed to stir each other and engage, it is characterized in that, comprise: preparatory process, in this preparatory process, engage with the hook portion being formed on the opposing party's the end of outside plate of above-mentioned double face slab being formed on hook portion on a side the end of outside plate of above-mentioned double face slab, and the end face being formed on a side the end of inner panel of above-mentioned double face slab is docked with the end face of the inner panel of the opposing party's above-mentioned double face slab, and do not engage, and bonding process, in this bonding process, the docking section after the holding section after engaging in above-mentioned preparatory process and docking is rubbed to stir to be engaged.

According to above-mentioned joint method, engage with each other by the hook portion that makes outside plate, just can prevent from engaging time, double face slab be separated from each other. If hook portion is also set at inner panel, the operation meeting of double face slab docking each other becomes difficulty, therefore, in the present invention, at inner panel, hook portion is not set, and only by end face is docked. By this, can make more laborsaving the operation of the preparatory process of double face slab docking.

In addition, comparatively it is desirable to, in above-mentioned bonding process, after above-mentioned holding section is engaged, more above-mentioned docking section is engaged.

From the viewpoint of bond strength, it is all no problem no matter first which in holding section and junction surface to be engaged, but according to above-mentioned method, can dwindle the angular deformation each other of metallic plate after joint.

Invention effect

According to throw of the present invention unit and friction stirring connecting method, can suppress the generation of joint defect, and can engage ideally. In addition, according to the friction stirring connecting method of the assembly of double face slab of the present invention and double face slab, can ideally double face slab be engaged.

Brief description of the drawings

Fig. 1 is the side view of the friction agitating device of embodiment 1.

Fig. 2 is the I-I cutaway view of Fig. 1.

Fig. 3 is the II-II cutaway view of Fig. 2.

Fig. 4 (a) is the cutaway view of sliding axle, and Fig. 4 (b) is the upward view of sliding axle, and Fig. 4 (c) is the side view of alignment pin (Japanese: ノッ Network ピ Application).

Fig. 5 is the figure that represents the first shaft shoulder portion of embodiment 1, and wherein, Fig. 5 (a) is cutaway view, and Fig. 5 (b) is upward view.

Fig. 6 is the figure that represents the second shaft shoulder portion of embodiment 1, and wherein, Fig. 6 (a) is cutaway view, and Fig. 6 (b) is top view.

Fig. 7 is the figure that represents the threaded of embodiment 1, and wherein, Fig. 7 (a) is side view, and Fig. 7 (b) is top view.

Fig. 8 (a) is the cutaway view that represents the variation of the first shaft shoulder portion of embodiment 1, and Fig. 8 (b) is the cutaway view that represents the variation of the second shaft shoulder portion of embodiment 1.

Fig. 9 is the cutaway view that represents the variation of embodiment 1.

Figure 10 represents the friction agitating device of embodiment 2 and the stereogram of hollow material.

Figure 11 is the mated condition that represents hollow material, and wherein, Figure 11 (a) represents that, before docking, Figure 11 (b) represents after docking.

Figure 12 is the stereogram that represents the friction agitating device of embodiment 2.

Figure 13 is the III-III cutaway view of Figure 12.

Figure 14 is the IV-IV cutaway view of Figure 12.

Figure 15 represents that the twin shaft shoulder of embodiment 2 stirs the side view of head dummy instrument.

Figure 16 is the figure that represents the friction stirring connecting method of embodiment 2, and wherein, Figure 16 (a) is sectional view, and Figure 16 (b) is the V-V end view drawing of Figure 16 (a).

Figure 17 represents that the twin shaft shoulder of embodiment 3 stirs the side view of head dummy instrument.

Figure 18 is the sectional view that represents the friction stirring connecting method of embodiment 3.

Figure 19 (a) represents the first variation of friction stirring connecting method, and Figure 19 (b) represents the second variation of friction stirring connecting method.

Figure 20 is the stereogram that represents the double face slab of embodiment 4.

Figure 21 is the stereogram that represents the friction agitating device of embodiment 4.

Figure 22 is the stereogram that represents the throw unit of embodiment 4.

Figure 23 represents that the twin shaft shoulder of embodiment 4 stirs the side view of head dummy instrument.

Figure 24 is the front view that represents the preparatory process of the friction stirring connecting method of embodiment 4.

Figure 25 is the stereogram that represents the first bonding process of the friction stirring connecting method of embodiment 4.

Figure 26 is the stereogram that represents the second bonding process of the friction stirring connecting method of embodiment 4.

Figure 27 is the front view that represents the variation of the engaging form of embodiment 4.

Figure 28 is the table that represents the combination of the test body in embodiment 1.

Figure 29 is illustrated in embodiment 1, the figure of the relation between the gap of test body H1 and the thickness at junction surface.

Figure 30 is illustrated in embodiment 1, the figure of the relation between the gap of test body H3 and the thickness at junction surface.

Figure 31 is illustrated in embodiment 1, affects the table of the relation between thickness and the gap of metallic plate of bond quality, and it shows the situation of the thickness of thickness=Re side of Ad side.

Figure 32 is the table that represents to affect the relation between plate thickness and the gap of bond quality, its show make Ad side varied in thickness and by the situation fixing thickness of Re side.

Figure 33 is the table that represents to affect the relation between plate thickness and the gap of bond quality, and it shows fixes the thickness of Ad side and makes the situation of the varied in thickness of Re side.

Figure 34 (a) is illustrated in embodiment 1, the table of the relation between the thickness of gap and Cr portion, and Figure 34 (b) is illustrated in embodiment 1, the table of the relation between the thickness of gap and Ad portion.

Figure 35 (a) is illustrated in embodiment 1, the table of the relation between the thickness of gap and Re portion, and Figure 35 (b) is illustrated in embodiment 1, the figure of the relation between gap and average thickness.

Figure 36 is illustrated in embodiment 2, affects the figure of the relation between thickness and the gap of metallic plate of bond quality, and it shows the situation of the thickness of thickness=Re side of Ad side.

Figure 37 is illustrated in embodiment 1, and when the distance between shaft shoulder portion is fixed as to 5.8mm, each twin shaft shoulder stirs the size of head dummy instrument and the table of connecting state.

Figure 38 is illustrated in embodiment 2, and when the distance between shaft shoulder portion is fixed as to 2.8mm, each twin shaft shoulder stirs the size of head dummy instrument and the table of connecting state.

Figure 39 is illustrated in reference example, and when the distance between shaft shoulder portion is fixed as to 11.5mm, each twin shaft shoulder stirs the size of head dummy instrument and the table of connecting state.

Figure 40 is illustrated in embodiment 3, the figure of the impact (gap of docking section is 0mm) that screw thread ratio is brought the difference of height of metallic plate.

Figure 41 is illustrated in embodiment 3, the figure of the impact (gap of docking section is 1.5mm) that screw thread ratio is brought the difference of height of metallic plate.

Figure 42 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition A.

Figure 43 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition B.

Figure 44 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition C.

Figure 45 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition D.

Figure 46 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition E.

Figure 47 is the table after the result of embodiment 3 is gathered.

Figure 48 is the table after the situation when making twin shaft shoulder stir head dummy instrument towards anticlockwise gathers.

Figure 49 is the front view that represents engaging form or the docking form of embodiment 4, and wherein, Figure 49 (a) represents type i, and Figure 49 (b) represents Type II, and Figure 49 (c) represents type-iii.

Figure 50 is the figure that represents the result of the angular deformation of the type i of embodiment 4.

Figure 51 is the figure that represents the result of the angular deformation of the Type II of embodiment 4.

Figure 52 is the figure that represents the result of the angular deformation of the type-iii of embodiment 4.

Figure 53 is the table after direction of rotation, spiral fluted coiling direction, the engaging form of the twin shaft shoulder stirring head dummy instrument of embodiment 4 are gathered.

Figure 54 is the figure for representing embodiment 6, and Figure 54 (a) represents body to be tested, and Figure 54 (b) is the table after each condition is gathered.

Figure 55 is the figure that represents the thickness of slab a of embodiment 6 and the incidence relation of length c.

Detailed description of the invention

[embodiment 1]

With reference to accompanying drawing, the friction agitating device of embodiment of the present invention is elaborated. As shown in Figure 1, the friction agitating device 300 of present embodiment is made up of chuck portion 301, the throw unit 302 that is fixed in chuck portion 301. Friction agitating device 300 is by making the throw unit 302 that is fixed on front end transfer pair of metal plate (not shown) is rubbed and stirs the device engaging around axle high-speed rotary.

It is upper that chuck portion 301 is fixed on apparatus main body (not shown), and rotate around rotating shaft C. Chuck portion 301 is cylindric.

As shown in Figure 1, throw unit 302 is mainly made up of keeper 303, sliding axle 304 and twin shaft shoulder stirring head dummy instrument 305.

Keeper 303 is fixed on the inner side of chuck portion 301, and rotates integratedly with chuck portion 301. Keeper 303 is cylindric. As shown in Figure 2, keeper 303 has a pair of slotted hole 311 and tabular surface 312. Slotted hole 311 with run through keeper 303 radially and mode respect to one another arrange. The long side direction of slotted hole 311 extends and arranges along the direction of rotating shaft C.

As shown in Figure 2, tabular surface 312 is arranged in a part for outer peripheral face for keeper 303, and it is to be smooth face along vertical. As shown in Figure 3, keeper 303 is fixing by fixture 313 with chuck portion 301. Fixture 313 screws togather with the thread groove that is formed at chuck portion 301, and its front end and tabular surface 312 butts. By this, chuck portion 301 becomes one with keeper 303, and rotates around rotating shaft C.

As shown in Figure 2, sliding axle 304 is the members that are inserted into keeper 303 inside, and itself and keeper 303 rotate around rotating shaft C integratedly. Sliding axle 304 is made up of sliding body 321, alignment pin 322 and fixed component 323.

As shown in Figure 4, sliding body 321 comprises the through hole 324 connecting vertically and the pin-and-hole 325 connecting along direction orthogonal to the axial direction. Through hole 324 is formed on the position overlapping with the rotating shaft C of sliding body 321, and it starts to comprise large-diameter portion 324a, and continuous minor diameter part 324b, stage portion 324c and the junction surface 324d being formed by the difference of height between large-diameter portion 324a and minor diameter part 324b of large-diameter portion 324a from upside. Position in minor diameter part 324b, more closer to the top than pin-and-hole 325 is formed with thread groove (negative thread). Fixed component 323 screws togather with the position that is formed with thread groove.

On the inner peripheral surface of junction surface 324d, be formed with thread groove (negative thread). Junction surface 324d is the position screwing togather with the first shaft shoulder portion 331 described later. As shown in Fig. 4 (a), Fig. 4 (b), pin-and-hole 325 is orthogonal with minor diameter part 324b, and connects sliding body 321.

As shown in Fig. 4 (c), alignment pin 322 comprises the 322a of standard shaft portion, the 322b of eel-like figure portion and tapering 322c. The 322b of eel-like figure portion is the part that diameter is less than the diameter of other parts. Tapering 322c is formed at the two ends of the 322a of standard shaft portion, and attenuates towards end.

Fixed component 323 is the members for alignment pin 322 being fixed on to sliding body 321. Fixed component 323 screws togather with minor diameter part 324b, the 322b of the eel-like figure portion butt of its front end and alignment pin 322. As shown in Figure 3, be formed with hexagonal groove at the head of fixed component 323.

As shown in Figure 2, sliding axle 304 is positioned under the state of slotted hole 311,311 at the two ends of alignment pin 322, is inserted into the inside of keeper 303.

As shown in Figure 2, it is the members that engage with the front end of sliding axle 304 that twin shaft shoulder stirs head dummy instrument 305, and it is mainly made up of the first shaft shoulder portion 331, the second shaft shoulder portion 341, threaded 351, the first securing member 371 and the second securing member 372. The configuration separated from one another of the first shaft shoulder portion 331 and the second shaft shoulder portion 341, and link by threaded 351.

As shown in Fig. 5 (a), the first shaft shoulder portion 331 comprises the first large-diameter portion 332, the first minor diameter part 333 and is formed at the first inner hollow bulb 334. The first large-diameter portion 332 and the first minor diameter part 333 are all roughly cylindric. The first large-diameter portion 332 has than the large external diameter of the first minor diameter part 333. As shown in Fig. 5 (b), be formed with around rotating shaft C and carve in the shape of a spiral the groove 332b establishing at the lower surface 332a of the first large-diameter portion 332. The cross sectional shape semicircular in shape shape of groove 332b. Be formed with the thread groove (pin thread) screwing togather with the junction surface 324d of sliding axle 304 at the outer peripheral face of the first minor diameter part 333.

The first hollow bulb 334 is the positions of inserting for threaded 351, and it connects on above-below direction. The first hollow bulb 334 starts to have the first lower-side hole 335, the first inboard aperture 336, the first connecting hole 337, the first inboard aperture II338 and the first upper-side hole 339 from downside. The first lower-side hole 335, the first inboard aperture 336, the first inboard aperture II338 and the first upper-side hole 339 all have columned inner space. The internal diameter of the first lower-side hole 335 is larger than the internal diameter of the first inboard aperture 336. The internal diameter of the first upper-side hole 339 is larger than the internal diameter of the first inboard aperture II338. The first connecting hole 337 has the roughly inner space of quadrangular shape. In the present embodiment, the horizontal cross sectional geometry of the first connecting hole 337 is square roughly, but can be also other polygon.

As shown in Fig. 6 (a), Fig. 6 (b), the second shaft shoulder portion 341 comprises the second large-diameter portion 342, the second minor diameter part 343 and is formed at the second inner hollow bulb 344. Be formed with multiple (being in the present embodiment three) recessed the 342a towards inner side depression at the outer peripheral face of the second large-diameter portion 342. On the upper surface 342b of the second large-diameter portion 342, be formed with around rotating shaft C and carve in the shape of a spiral the groove 342c establishing. The cross sectional shape of groove 342c is semi-circular shape.

The second hollow bulb 344 is the positions of inserting for threaded 351, and it connects on above-below direction. The second hollow bulb 344 starts to have the second upper-side hole 345, the second inboard aperture 346, the second connecting hole 347 and the second lower-side hole 348 from upside. The second upper-side hole 345, the second inboard aperture 346 and the second lower-side hole 348 all have columned inner space. The internal diameter of the second upper-side hole 345 is larger than the internal diameter of the second inboard aperture 346. The second connecting hole 347 has the roughly inner space of quadrangular shape. In the present embodiment, the horizontal cross sectional geometry of the second connecting hole 347 is square roughly, but can be also other polygon.

As shown in Figure 2, threaded 351 is members that the first shaft shoulder portion 331 and the second shaft shoulder portion 341 are linked. As shown in Fig. 7 (a), Fig. 7 (b), threaded 351 is upper and lower symmetry, is formed with in the central spiral slot part 352. The upside of spiral slot part 352 is the positions that are inserted into the first shaft shoulder portion 331, and downside is the position that is inserted into the second shaft shoulder portion 341. The upside of spiral slot part 352 has first footpath axial region 353, the first path axial region 354, the first engaging axial region 355, the first front end axial region 356. The downside of spiral slot part 352 has second largest footpath axial region 357, the second path axial region 358, the second engaging axial region 359, the second front end axial region 360.

Spiral slot part 352 is for being the part from exposing between the first shaft shoulder portion 331 and the second shaft shoulder portion 341, and it is the position that is inserted into the metallic plate (not shown) that will engage. On the outer peripheral face of spiral slot part 352, be carved with helicla flute. In the present embodiment, be carved with right-hand thread in the first half of spiral slot part 352, the latter half is carved with left-hand thread. The spiral fluted direction of rotation, the right-hand thread that are engraved on spiral slot part 352 can suitably be set according to the different of the metallic plate that will engage from ratio, the cross sectional shape of left-hand thread.

First footpath axial region 353 is cylindric. The external diameter of first footpath axial region 353 is larger than the external diameter of spiral slot part 352. First footpath axial region 353 is the positions that are inserted into the first lower-side hole 335 of the first shaft shoulder portion 331 shown in Fig. 5 (a).

The first path axial region 354 is cylindric. The external diameter of the first path axial region 354 is less than the external diameter of first footpath axial region 353. The first path axial region 354 is the positions that are inserted into the first inboard aperture 336 of the first shaft shoulder portion 331 shown in Fig. 5 (a).

The first engaging axial region 355 is quadrangular shape. The horizontal cross sectional geometry of the first engaging axial region 355 is for roughly square. Catercorner length in the horizontal cross-section of the first engaging axial region 355 and the external diameter of the first path axial region 354 are roughly equal. The first engaging axial region 355 is the positions that closely engage with the first connecting hole 337 of the first shaft shoulder portion 331 shown in Fig. 5 (a).

The first front end axial region 356 is cylindric. The external diameter of the first front end axial region 356 is less than the length on a limit of the horizontal cross-section of the first engaging axial region 355. Be formed with thread groove (pin thread) at the outer peripheral face of the first front end axial region 356. The first front end axial region 356 is to be inserted into the first inboard aperture 338 shown in Fig. 5 (a) and the position of the first upper-side hole 339.

Second largest footpath axial region 357 is cylindric. The external diameter of second largest footpath axial region 357 is larger than the external diameter of spiral slot part 352. Second largest footpath axial region 357 is the positions that are inserted into the second upper-side hole 345 of the second shaft shoulder portion 341 shown in Fig. 6 (a).

The second path axial region 358 is cylindric. The external diameter of the second path axial region 358 is less than the external diameter of second largest footpath axial region 357. The second path axial region 358 is the positions that are inserted into the second inboard aperture 346 of the second shaft shoulder portion 341 shown in Fig. 6 (a).

The second engaging axial region 359 is quadrangular shape. The horizontal cross sectional geometry of the second engaging axial region 359 is for roughly square. Catercorner length in the horizontal cross-section of the second engaging axial region 359 and the external diameter of the second path axial region 358 are roughly equal. The second engaging axial region 359 is the positions that closely engage with the second connecting hole 347 of the second shaft shoulder portion 341 shown in Fig. 6 (a).

The second front end axial region 360 is cylindric. The external diameter of the second front end axial region 360 is less than the length on a limit of the horizontal cross-section of the second engaging axial region 359. On the outer peripheral face of the second front end axial region 360, be formed with thread groove (pin thread). The second front end axial region 360 is the positions that are inserted into the second lower-side hole 348 shown in Fig. 6 (a).

Then, the assemble method to each member. First,, with reference to Fig. 2, Fig. 5～Fig. 7, the assemble method that twin shaft shoulder is stirred to head dummy instrument 305 describes. The first front end axial region 356 of threaded 351 is inserted to the first shaft shoulder portion 331, the first engaging axial region 355 is engaged with the first connecting hole 337. Then,, at the first upper-side hole 339 places, use the first securing member 371 that the first front end axial region 356 is linked.

On the other hand, the second leading section 360 of threaded 351 is inserted to the second shaft shoulder portion 341, the second engaging axial region 359 is engaged with the second connecting hole 347. Then,, at the lower surface of the second shaft shoulder portion 341, use the second securing member 372 that the second front end axial region 360 is linked. The first connecting hole 337 engages axial region 355, the second connecting hole 347 and engages axial region 359 with second and be prism-shaped (overlook and be for polygon) with first, therefore, can not engage each other with dallying.

Twin shaft shoulder is installed and is stirred after head dummy instrument 305, the first minor diameter part 333 of the first shaft shoulder portion 331 is screwed togather to the junction surface 324d to sliding axle 304, engage sliding axle 304 and stir head dummy instrument 305 with twin shaft shoulder.

Then, sliding axle 304 is inserted to keeper 303 on one side, make slotted hole 311,311 be communicated with alignment pin 322 is inserted with pin-and-hole 325 on one side. Then, fixed component 323 is inserted to the through hole 324 of sliding body 321, and use not shown die nut that fixed component is fastening.

Finally, keeper 303 is inserted to chuck portion 301 on one side, use fixture 313 that keeper 303 is fixing with chuck portion 301 on one side.

According to throw described above unit 302, the sliding axle 304 that twin shaft shoulder stirring head dummy instrument 305 is installed moves vertically with respect to keeper, and therefore, twin shaft shoulder stirs head dummy instrument 305 and also can move vertically along with the distortion of metallic plate. By this, can prevent that metallic plate is out of shape and causes bonding station to depart from, and therefore, can suppress the generation of joint defect. In addition, be inserted in a pair of slotted hole 311 of keeper 303 owing to being fixed on the alignment pin 322 of sliding axle 304, therefore, can make sliding axle 304 stably move.

In addition, the sliding axle 304 of present embodiment has the through hole 324 connecting vertically, the pin-and-hole 325 that orthogonal with through hole 324 and confession alignment pin 322 inserts, and fixed component 323 inserts through hole 324, its front end and alignment pin 322 butts. In addition, be formed with the eel-like figure portion 322b thinner than other parts at the central portion of alignment pin 322, the front end of fixed component 323 and the 322b of eel-like figure portion butt. By this, can with simple reliable in structure alignment pin 322 is fixed on to sliding axle 304.

In addition, according to present embodiment, by the first minor diameter part 333 of the first shaft shoulder portion 331 is screwed togather or remove screwing togather of the first minor diameter part 333 and junction surface 324d with the junction surface 324d that is formed at sliding axle 304 front ends, just can freely install and remove. By this, can easily carry out replacing and the maintenance of twin shaft shoulder stirring head dummy instrument 305.

In addition, twin shaft shoulder stirring head dummy instrument 305 need to be along with the difference of the plate thickness that will engage or kind changes the distance of the first shaft shoulder portion 331 and the second shaft shoulder portion 341, the thickness of threaded 351. In addition, because wearing and tearing need to be changed the first shaft shoulder portion 331, the second shaft shoulder portion 341 and threaded 351. According to present embodiment, the first shaft shoulder portion 331 and the second shaft shoulder portion 341 that twin shaft shoulder stirs head dummy instrument 305 can easily install and remove with respect to threaded 351, therefore, can easily carry out replacing and the maintenance of each member.

In addition, the upper surface 342b of the lower surface 332a of the first shaft shoulder portion 331 and the second shaft shoulder portion 341 is formed with respectively the groove 332b, the groove 342c that form in the shape of a spiral around the rotating shaft C of twin shaft shoulder stirring head dummy instrument 305. By this, can improve friction stirring efficiency.

Above, embodiments of the present invention are illustrated, but can in the scope of not violating aim of the present invention, suitably design change. For example, the groove being arranged on the lower surface 331a of the first shaft shoulder portion 331 and the upper surface 341b of the second shaft shoulder portion 341 also can only be arranged in any one in lower surface 331a and upper surface 341b, also can omit groove.

In addition, the first connecting hole 337 engages axial region 355, the second connecting hole 347 engage axial region 359 shape with second as long as engaging axial region can not rotate with respect to connecting hole with first, can be arbitrary shape. For example, also can and engage in any one in axial region at connecting hole and form key, and form keyway on another.

Fig. 8 (a) is the cutaway view that represents the variation of the first shaft shoulder portion of embodiment 1, and Fig. 8 (b) is the cutaway view that represents the variation of the second shaft shoulder portion of embodiment 1. Fig. 9 is the cutaway view that represents the variation of embodiment 1. As shown in Figure 8, in the variation of embodiment 1, using on the first engaging screw 473 and second engaging screw 474 these aspects, different from the embodiment described above. The twin shaft shoulder of variation stirs head dummy instrument 405 mainly by the first shaft shoulder portion 431, the second shaft shoulder portion 441, threaded 451, the first securing member 471, the second securing member 472, the first engaging screw 473 and the second engaging screw 474.

As shown in Fig. 8 (a), the first shaft shoulder portion 431 comprises the first large-diameter portion 432, the first minor diameter part 433, is formed at inner the first hollow bulb 434 and the first screw engaging elongated hole (Japanese: a ネジ Department tires out hole) 438. The first large-diameter portion 432 is roughly cylindric, and its lower end side attenuates towards front end. The first minor diameter part 433 is roughly cylindric. The external diameter of the first minor diameter part 433 to the first large-diameter portions 432 is little. On the outer peripheral face of the first minor diameter part 433, be formed with the thread groove (pin thread) screwing togather with the junction surface 324d of sliding axle 304. In addition, also can on the lower surface 432a of the first large-diameter portion 432, groove be set.

The first hollow bulb 434 is the positions of inserting for threaded 451, and it connects on above-below direction. The first hollow bulb 434 starts to have the first lower-side hole 435, the first inboard aperture 436 and the first upper-side hole 437 from downside. The first lower-side hole 435 is the positions that are equivalent to " the first hole " in claims. The first lower-side hole 435, the first inboard aperture 436 and the first upper-side hole 437 all have columned inner space. The internal diameter of the first inboard aperture 436, the first lower-side hole 435, the first upper-side hole 437 increases successively.

The first screw engaging elongated hole 438 sides from the first large-diameter portion 432 are extended and are arranged towards rotating shaft C direction, and are communicated with the first lower-side hole 435. In the first screw engaging elongated hole 438 by rotating shaft C one side, be formed with thread groove (negative thread).

As shown in Fig. 8 (b), the second shaft shoulder portion 441 comprises the second main part 442, is formed at inner the second hollow bulb 444 and the second screw engaging elongated hole 447. On the outer peripheral face of the second main part 442, be formed with multiple (being in the present embodiment four) recessed the 442a towards inner side depression. In addition, also can on the upper surface 442b of the second main part 442, groove be set.

The second hollow bulb 444 is the positions of inserting for threaded 451, and it connects on above-below direction. The second hollow bulb 444 starts to have the second upper-side hole 445 and the second lower-side hole 446 from upside. The second upper-side hole 445 is the positions that are equivalent to " the second hole " in claims. The second upper-side hole 445 and the second lower-side hole 446 all have columned inner space. The internal diameter of the second upper-side hole 445 is larger than the internal diameter of the second lower-side hole 446.

The second screw engaging elongated hole 447 sides from the second main part 442 are extended and are arranged towards rotating shaft C direction, and are communicated with the second upper-side hole 445. In the second screw engaging elongated hole 447, be formed with thread groove (negative thread) by rotating shaft C one side.

As shown in Figure 9, threaded is symmetrical Shang Xia 451, is formed with in the central spiral slot part 452. Spiral slot part 452 is the parts from exposing between the first shaft shoulder portion 431 and the second shaft shoulder portion 441. The upside of spiral slot part 452 has first footpath axial region 453 and the first path axial region 454. The downside of spiral slot part 452 has second largest footpath axial region 455 and the second path axial region 456.

First footpath axial region 453 and the first path axial region 454 are all roughly cylindric. The external diameter of first footpath axial region 453 is larger than the external diameter of the first path axial region 454. First footpath axial region 453 is the positions that are inserted in the first lower-side hole 435 shown in Fig. 8 (a). Be formed with the first par 453a as tabular surface at the outer peripheral face of first footpath axial region 453. First footpath axial region 453 is the positions that are equivalent to " the first axle part " in claims. The first path axial region 454 is the positions that are inserted in the first inboard aperture 436 and the first upper-side hole 437. Be formed with thread groove (pin thread) at the front end of the first path axial region 454.

Second largest footpath axial region 455 and the second path axial region 456 are all roughly cylindric. The external diameter of second largest footpath axial region 455 is larger than the external diameter of the second path axial region 456. Second largest footpath axial region 455 is the positions that are inserted in the second upper-side hole 445 shown in Fig. 8 (b). Be formed with the second par 455a as tabular surface at the outer peripheral face of second largest footpath axial region 455. Second largest footpath axial region 455 is the positions that are equivalent to " the second axle part " in claims. The second path axial region 456 is the positions that are inserted in the second lower-side hole 446. Be formed with thread groove (pin thread) at the front end of the second path axial region 456.

Then, the assemble method of the twin shaft shoulder stirring head dummy instrument 405 to variation describes. As shown in Figure 8, Figure 9, first, the first footpath axial region 453 of threaded 451 and the first path axial region 454 are inserted to the first shaft shoulder portion 431. Then, the first engaging screw 473 and the first screw engaging elongated hole 438 are screwed togather, make the front end of the first engaging screw 473 and the first par 453a butt of first footpath axial region 453 simultaneously. Then, the first securing member 471 is fastened on the first path axial region 454.

On the other hand, the second largest footpath axial region 455 of threaded 451 and the second path axial region 456 are inserted to the second shaft shoulder portion 441. Then, the second engaging screw 474 and the second screw engaging elongated hole 447 are screwed togather, make the front end of the second engaging screw 474 and the second par 455a butt of second largest footpath axial region 455 simultaneously. Then, the second securing member 472 is fastened to the second path axial region 456.

After twin shaft shoulder stirring head dummy instrument 405 is assembled, the first minor diameter part 433 and the junction surface 324d of sliding axle 304 of the first shaft shoulder portion 431 are screwed togather, sliding axle 304 and twin shaft shoulder stirring head dummy instrument 405 are engaged.

In variation described above, also can realize the effect roughly the same with above-mentioned embodiment. By threaded 451 and the first shaft shoulder portion 431 and the second shaft shoulder portion 441 when integrated, the first engaging screw 473 and the second engaging screw 474 are screwed togather, make front end and the first par 453a butt of the first engaging screw 473 simultaneously, and make front end and the second tabular surface 455a butt of the second engaging screw 474, by this, can easily limit the relative rotation between threaded 451 and the first shaft shoulder portion 431 and the second shaft shoulder portion 441. In addition, as long as the first engaging screw 473 and the second engaging screw 474 are removed, just can easily threaded 451 be decomposed with the first shaft shoulder portion 431 and the second shaft shoulder portion 441. Therefore, can make the replacing of member and maintenance become easy.

In variation, also can cross section be set in the inside of the first shaft shoulder portion 431 and the second shaft shoulder portion 441 and be non-circular connecting hole, simultaneously be the engaging axial region of column in the part setting of the axial region of threaded 451, and make this connecting hole and engage axial region and engage with each other. By this, can limit reliably the relative rotation between threaded 451 and the first shaft shoulder portion 431 and the second shaft shoulder portion 441.

[embodiment 2]

Below, with reference to accompanying drawing, embodiment of the present invention 2 is elaborated. As shown in figure 10, the friction agitating device 1 of present embodiment is that the docking section N of the pair of metal plate after docking is rubbed and stirs the device engaging. At the front end of friction agitating device 1, twin shaft shoulder is installed and stirs head dummy instrument 5. First, the pair of metal plate that engage is described. Upper and lower, front, rear, left and right in explanation are according to the direction of arrow of Figure 10.

As shown in Figure 11 (a), in the present embodiment, exemplified with the situation that hollow material 100A is engaged with hollow material 100B. Hollow material 100A is the extrded material of aluminium alloy system, and is the strip component with the rectangular hollow bulb 100a in cross section. Hollow material 100A have comprise the main part 101 of hollow bulb 100a, from the left surface upper and lower side of the main part 101 tabular end 102,103 that (hollow material 100B mono-side) stretches out respectively towards left side.

Main part 101 is made up of four plane materiel material 104,105,106,107, and its cross section is formed as rectangle. Tabular end 102,103 is tabular, and perpendicular to plane materiel material 105. The left and right directions length of tabular end 102,103 is the half left and right of plane materiel material 104. In addition, the thickness of tabular end 102,103 is identical with the thickness of plane materiel material 104,105,106,107. Tabular end the 102, the 103rd, is equivalent to the position of " metallic plate " in claims.

Hollow material 100B has and the hardware of hollow material 100A same shape. The symbol that hollow material 100B mark is identical with hollow material 100A, and detailed.

In the time that hollow material 100A docks with hollow material 100B, the tabular end 102,103 of hollow material 100A is docked respectively with the tabular end 102,103 of hollow material 100B. In more detail, the end face 102a of tabular end 102 of hollow material 100A and the end face 102a of the tabular end 102 of hollow material 100B are docked, the end face 103a of tabular end 103 of hollow material 100A and the end face 103a of the tabular end 103 of hollow material 100B are docked. As shown in Figure 11 (b), in the time that hollow material 100A is docked with hollow material 100B, the center of the short transverse of end face 102a, 102a overlaps each other, and, each upper surface flush of tabular end 102,102, each lower surface of tabular end 102,102 flushes.

As shown in Figure 11 (b), will make the part after end face 102a docks with end face 103a with end face 102a, end face 103a be called " docking section N ". In the time that docking section N is engaged, preferably make end face 102a and end face 102a close contact, but the frictional heat because of the tolerance of hollow material 100A, 100B or while engaging, deforms tabular end 102,102, and produce tiny gap between end face 102a and end face 102a sometimes. Docking section N is the concept producing between end face 102a and end face 102a the situation of slight gap.

In the present embodiment, exemplified with using the tabular end of hollow material as the object that will engage, but the object that will engage forms by the metal stirring that can rub, and as long as being tabular member, is not particularly limited.

As shown in figure 12, friction agitating device 1 is mainly made up of with the throw unit 2 that is fixed on the 1a of chuck portion inside the 1a of chuck portion. As shown in figure 13, the 1a of chuck portion is the cylindrical structural member that comprises flange, and use screw B1 and with friction agitating device 1 main body D be connected. The 1a of chuck portion rotates by the driving of friction agitating device 1 position pivoting. Be formed with barrel surface 1b interior week at the 1a of chuck portion.

As shown in figure 13, throw unit 2 is made up of keeper 3, sliding axle 4, twin shaft shoulder stirring head dummy instrument 5. Throw unit 2 can be installed and removed with respect to the 1a of chuck portion.

Keeper 3 is the members that are built-in with sliding axle 4 and are fixed on the 1a of chuck portion inside. Keeper 3 is cylindric. Be formed with the tabular surface 3a that flatly extends setting along above-below direction at the outer surface of keeper 3, therefore, between barrel surface 1b and tabular surface 3a, form tiny gap. Bolt 2B, 2B are fastening towards radially carrying out from the outer surface of the 1a of chuck portion, its front end and tabular surface 3a butt. By this, the 1a of chuck portion and keeper 3 rotate integratedly. In addition, as shown in figure 14, keeper 3 is formed with the keyway 3b of the slotted hole shape radially connecting.

As shown in figure 13, sliding axle 4 is cylindric, and it is the member that is disposed at the hollow bulb of keeper 3. Sliding axle 4 can move up at upper and lower with respect to keeper 3. As shown in figure 14, be formed with outwardly side-prominent key 4a at the outer surface of sliding axle 4. Key 4a engages with keyway 3b, and by this, keeper 3 rotates integratedly with sliding axle 4.

As shown in figure 15, twin shaft shoulder stirs head dummy instrument 5 and is for example formed by tool steel, and is connected with sliding axle 4. Twin shaft shoulder stirs head dummy instrument 5 and the 1a of chuck portion, keeper 3 and sliding axle 4 integratedly towards the rotation of both forward and reverse directions. Twin shaft shoulder stirs head dummy instrument 5 and has the first shaft shoulder portion 11, below the first shaft shoulder portion 11 across spaced the second shaft shoulder portion 12, threaded 13 that the first shaft shoulder portion 11 and the second shaft shoulder portion 12 are linked.

The first shaft shoulder portion 11 and the second shaft shoulder portion 12 are cylindric, and have identical external diameter. Threaded 13 is cylindric, and the first shaft shoulder portion 11 and the second shaft shoulder portion 12 are linked. Threaded 13 connects the second shaft shoulder portion 12. The threaded 13 that connects the second shaft shoulder portion 12 passes through fastening nuts in the lower end of the second shaft shoulder portion 12. Be carved with top helicla flute 13a and lower part helical groove 13b at the outer peripheral face of threaded 13. The groove direction of top helicla flute 13a and lower part helical groove 13b is carved and is established in the mode of reeling towards opposite directions.

Top helicla flute 13a carves and establishes to the centre position of the short transverse of threaded 13 from the lower end of the first shoulder axle 11. In the present embodiment, make twin shaft shoulder stir head dummy instrument 5 towards right rotation, therefore, top helicla flute 13a forms in the mode of right-hand thread. That is to say, top helicla flute 13a is to carve and to establish towards the mode of right side coiling from the top down.

On the other hand, lower part helical groove 13b carves and establishes to the centre position of the short transverse of threaded 13 from the upper end of the second shoulder axle 12. In the present embodiment, make twin shaft shoulder stir head dummy instrument 5 towards right rotation, therefore, lower part helical groove 13b forms in the mode of left-hand thread. That is to say, lower part helical groove 13b carves and establishes in the mode towards left coiling from the top down.

By formation described above top helicla flute 13a and lower part helical groove 13b, through friction stir and metal after Plastic Flow just can from the middle body of the short transverse of tabular end 102 upward extreme direction or extreme direction move slightly. In addition, compared with the above-mentioned metal towards above-below direction moves and makes the movement of metal on Zhou Fangxiang with the rotation of stirring the threaded 13 of head dummy instrument 5 because of twin shaft shoulder, be only trace.

For spiral fluted coiling direction or the ratio of establishing of carving, as long as suitably set according to position relationship, the direction of rotation that twin shaft shoulder stirs head dummy instrument etc. of the decorative cover of the metallic plate that will engage and twin shaft shoulder stirring head dummy instrument 5. In the present embodiment, though double thread pin is provided with right-hand thread and these two kinds of helicla flutes of left-hand thread 13 quarters, also can all carves the helicla flute of establishing right-hand screw by double thread pin 13, or all carve the helicla flute of establishing left-hand screw. In addition, in the present embodiment, though carve and establish right-hand thread in the first shaft shoulder portion 11 sides, carve and establish left-hand thread in the second shaft shoulder portion 12 sides, also can carve and establish left-hand thread in the first shaft shoulder portion 11 sides, carve and establish right-hand thread in the second shaft shoulder portion 12 sides.

As shown in figure 15, comparatively it is desirable to, make twin shaft shoulder stir distance Z (length of the exposed portions serve of threaded 13) between the shaft shoulder portion of head dummy instrument 5 identical or less than the thickness T of the tabular end 102 of hollow material 100A with the thickness T of the tabular end 102 of hollow material 100A. For example, in the present embodiment, the distance Z between shaft shoulder portion is than the little 0.2mm of thickness T of the tabular end 102 of hollow material 100A.

In addition, in the case of the gap of end face 102a, the 102a of docking section N (with reference to Figure 11 (b)) being set as below 0.75mm, even if the thickness T of tabular end 102 is set as identical with the spacing Z of shaft shoulder portion, be T-Z=0, also can obtain good engagement state.

In addition, in the case of the gap of end face 102a, the 102a of docking section N being set as below 1.00mm, comparatively it is desirable to, the spacing Z of the thickness T of tabular end 102 and shaft shoulder portion is set as to 0.2mm≤T-Z≤0.8mm.

In the case of the gap of end face 102a, the 102a of docking section N being set as being greater than 1.00mm and for below 1.75mm, comparatively it is desirable to, the spacing Z of the thickness T of tabular end 102 and shaft shoulder portion is set as to 0.4mm≤T-Z≤0.8mm.

In addition, comparatively it is desirable to, twin shaft shoulder is stirred to square value that head dummy instrument 5 sets the external diameter X (diameter of the face contacting with tabular end 102) that makes the first shaft shoulder portion 11 and the second shaft shoulder portion 12 for the value after divided by the square value of the external diameter Y of threaded 13 larger than 2.0. Stir head dummy instrument 5 according to above-mentioned twin shaft shoulder, can utilize the first shaft shoulder portion 11 and the second shaft shoulder portion 12 to suppress the quantity of material of discharging as burr, therefore, can reduce the generation of joint defect.

In addition, comparatively it is desirable to, twin shaft shoulder is stirred to square value that head dummy instrument 5 sets the external diameter X (diameter of the face contacting with tabular end 102) of the first shaft shoulder portion 11 and the second shaft shoulder portion 12 for and deduct the value obtaining after the square value of external diameter Y of threaded 13, and the value of the square value of external diameter Y that makes threaded 13 after divided by value obtained above is larger than 0.2. Stir head dummy instrument 5 according to above-mentioned twin shaft shoulder, can guarantee to engage fully time, threaded, with respect to the tensile resistence of the material resistance upwards producing at tool spindle, therefore, can prevent the breakage of threaded 13.

In addition, comparatively it is desirable to, the square value of setting twin shaft shoulder stirring head dummy instrument 5 for make threaded 13 external diameter Y takes advantage of the value after the distance Z between shaft shoulder portion larger than 1.2 divided by the external diameter Y of threaded 13. Stir head dummy instrument 5 according to above-mentioned twin shaft shoulder, can fully guarantee to engage time, the fracture resistence force of the threaded material resistance mobile with respect to the direction along contrary with instrument direct of travel, therefore, can prevent the breakage of threaded 13. For above-mentioned basis, will be recorded in an embodiment.

At this, stir while engaging rubbing, make sometimes the temperature rise of tabular end 102,102 because of frictional heat, and make tabular end 102,102 towards above or below warpage. In the friction agitating device 1 of present embodiment, because sliding axle 4 is formed as moving with respect to keeper 3, therefore, tabular end 102 for example towards above when warpage, twin shaft shoulder stir head dummy instrument 5 can be along with above-mentioned warpage towards top mobile predetermined distance. On the other hand, tabular end 102 towards below when warpage, twin shaft shoulder stir head dummy instrument 5 can be along with above-mentioned warpage towards below mobile predetermined distance. By this, can be suppressed at twin shaft shoulder in friction stirring joint and stir the position skew of head dummy instrument 5 with respect to metallic plate.

Then, the joint method that uses the twin shaft shoulder of embodiment 2 to stir head dummy instrument 5 is described.

In the joint method of embodiment 2, make twin shaft shoulder stir head dummy instrument 5 and transfer and engage towards dextrorotation. Specifically, in this joint method, make docking operation that hollow material docks each other and twin shaft shoulder is stirred to head dummy instrument 5 and inserts the bonding process of docking section N. At this, surperficial Sa is set as to decorative cover.

In docking operation, as shown in figure 11, make the tabular end 102 of hollow material 100A and hollow material 100B toward each other, end face 102a is contacted with end face 103a face with end face 102a, end face 103a. In more detail, so that the overlapping mode face of the mid point of the mid point of a side end face 102a and the opposing party's end face 102a contact. After docking, can engage by modes such as welding along docking section N temporarily, and make hollow material 100A and hollow material 100B not separated. After hollow material 100A is docked with hollow material 100B, fixedly make it not move both.

In bonding process, first, in the outside of docking section N, make threaded 13 center 13c be positioned at the position overlapping with the center Nc of docking section N. Then, as shown in figure 16, the twin shaft shoulder stirring head dummy instrument 5 of right rotation is moved along docking section N. Stir head dummy instrument 5 at twin shaft shoulder and insert after the N of docking section, utilize the stirring that rubs of threaded 13 double thread pins 13 metal around of High Rotation Speed, and make between tabular end 102 integrated. On the track of threaded 13, be formed with plastification region W.

According to the joint method of present embodiment described above, make tabular end (metallic plate) 102,102 warpages even stir because of friction the frictional heat engaging, twin shaft shoulder stirs head dummy instrument 5 and also can on above-below direction, move swimmingly along with above-mentioned warpage. The height and position that by this, can suppress the center Nc of threaded 13 center 13c and docking section N is offset. Therefore, can prevent that bonding station is offset.

In addition, as this present embodiment, by the distance Z between the shaft shoulder portion of twin shaft shoulder stirring head dummy instrument 5 is set as below the thickness T of tabular end 102, just can press the metal of Plastic Flow, therefore, can prevent from being spilled over to because of the metal of friction stirring Plastic Flow the outside of the first shaft shoulder portion 11 and the second shaft shoulder portion 12. By this, can suppress the generation of joint defect. In addition, if the value of T-Z exceedes 0.8, can increase the load to friction agitating device 1, therefore, improper.

In addition, according to joint method, through friction stir and the metal of liquidation is guided by the top helicla flute 13a of the right-hand thread of threaded 13 and the lower part helical groove 13b of left-hand thread, and from tabular end 102 center Nc respectively towards surperficial Sa side and back side Sb side shifting. Because the top helicla flute 13a of right-hand thread forms with more than 25% ratio, therefore, the metal being caused by above-mentioned helicla flute moves and can make twin shaft shoulder stirring head dummy instrument 5 promote towards sliding axle 4 sides (top) with respect to tabular end 102, can prevent from entering too far into surface (decorative cover) Sa. By this, can prevent that decorative cover from producing groove V, even if or produce groove V and also can reduce the degree of depth of groove V. By preventing that groove V from producing or reducing the degree of depth of groove V, just can easily make surface (decorative cover) Sa become level and smooth fine finishining processing.

In addition, in embodiment 2, the ratio of top helicla flute 13a and lower part helical groove 13b is 50:50, therefore, as shown in Figure 16 (a), can make the amount of metal equalization in upside and lower side shifting. By this, can further prevent the position skew of the center Nc of threaded 13 center 13c and docking section N. In addition,, owing to being provided with top helicla flute 13a and lower part helical groove 13b quarter, therefore, can improve the stirring efficiency that friction is stirred.

In the time carrying out bonding process, comparatively it is desirable to, carry out in cooling engaging at surface (decorative cover) Sa that for example utilizes the cooling device that can supply with cooled gas or liquid etc. to tabular end 102. By this, can suppress the distortion of tabular end 102 and make to engage precision raising. In addition, also can carry out in cooling engaging in the back side Sb side to tabular end 102.

In addition,, even if replace the throw unit 2 of embodiment 2 with the throw unit 302 of embodiment 1, also can obtain the effect roughly the same with embodiment 2.

[embodiment 3]

In the joint method of embodiment 3, spiral fluted structure and direction of rotation that twin shaft shoulder stirs head dummy instrument are different from embodiment 2. In the explanation of embodiment 3, for the point identical with embodiment 2, detailed.

Figure 17 represents that the twin shaft shoulder of embodiment 3 stirs the side view of head dummy instrument. As shown in figure 17, the outer peripheral face that stirs the threaded 13 of head dummy instrument 5A at the twin shaft shoulder of embodiment 3 is carved the lower part helical groove 13b that is provided with the top helicla flute 13a of the left-hand thread that is formed on the first half and is formed on the right-hand thread of Lower Half. That is to say, top helicla flute 13a carves and establishes in the mode towards left coiling from the top down, and lower part helical groove 13b carves and establishes in the mode towards right coiling from the top down.

Comparatively it is desirable to, distance (length of the exposed portions serve of the threaded 13) Z between the shaft shoulder portion of twin shaft shoulder stirring head dummy instrument 5A is below the thickness of slab T of tabular end 102 of hollow material 100A. For example, in the present embodiment, the distance Z between shaft shoulder portion is than the little 0.4mm of thickness of slab T of the tabular end 102 of hollow material 100A.

Then, the joint method that uses the twin shaft shoulder of embodiment 3 to stir head dummy instrument 5A is described.

In the joint method of embodiment 3, as shown in figure 18, make twin shaft shoulder stir head dummy instrument 5A and engage towards left-handed transferring. Specifically, in above-mentioned joint method, make docking operation that hollow material docks each other and twin shaft shoulder is stirred to head dummy instrument 5A and inserts the bonding process of docking section N. At this, surperficial Sa is set as to decorative cover. Because docking operation is identical with embodiment 2, therefore, description thereof is omitted.

In bonding process, first, in the outside of docking section N, make threaded 13 center 13c be positioned at the position overlapping with the center Nc of docking section N. Then, as shown in figure 18, the twin shaft shoulder stirring head dummy instrument 5A of anticlockwise is moved along docking section N. Insert after the N of docking section twin shaft shoulder is stirred to head dummy instrument 5A, utilize the stirring that rubs of threaded 13 double thread pins 13 metal around of High Rotation Speed, and make tabular end 102 integrated each other. On the track of threaded 13, be formed with plastification region W.

According to above-mentioned joint method, through friction stir and the metal of liquidation is guided by the top helicla flute 13a of the left-hand thread of threaded 13 and the lower part helical groove 13b of right-hand thread, and from tabular end 102 center Nc respectively towards surperficial Sa side and back side Sb side shifting. Because the top helicla flute 13a of left-hand thread forms with more than 25% ratio, therefore, the metal being caused by helicla flute moves and can make twin shaft shoulder stirring head dummy instrument 5A promote towards sliding axle 4 sides (top) with respect to tabular end 102, can prevent from entering too far into surface (decorative cover) Sa. By this, can prevent from producing groove V on decorative cover Sa, even if or be formed with groove V and also can reduce the degree of depth of groove V.

In addition, in embodiment 3, the ratio of top helicla flute 13a and lower part helical groove 13b is 50:50, therefore, can make mobile amount of metal equalization. By this, can further prevent the position skew of the center Nc of threaded 13 center 13c and docking section N. In addition,, owing to being provided with top helicla flute 13a and lower part helical groove 13b quarter, therefore, can improve the stirring efficiency that friction is stirred.

In variation 1, as shown in Figure 19 (a), on different these aspects of thickness of tabular end 102A and tabular end 102B, different from the embodiment described above. The thickness T 1 of tabular end 102B is thicker than the thickness T of tabular end 102A 2. In variation 1, by tabular end 102A with tabular end 102B so that the overlapping mode of mid point in the short transverse of the mid point in the short transverse of tabular end 102A and tabular end 102B dock.

In the docking operation of variation 1, make twin shaft shoulder stir head dummy instrument 5 towards right rotation, tabular end 102B (metallic plate) larger the thickness of the docking section N of tabular end 102B is configured in to the left side of direct of travel.

In the time that friction is stirred, in the situation that making throw towards right rotation, the metal of Plastic Flow has from the left side of instrument direct of travel (shearing side: the rotary speed of throw adds translational speed one side of throw) mobile trend in right side (flow side: the rotary speed of throw deducts translational speed one side of throw) towards instrument direct of travel, therefore, suppose between metallic plate, to have gap, the metal of shearing side can be by above-mentioned gap landfill. Thereby, if it is little to shear the plate thickness of side, there is the trend of the central portion less thick in the not enough and plastification region after making to engage of metal. In addition, in the situation that making throw towards anticlockwise, the right side of instrument direct of travel is for shearing side, and left side is flow side.

In variation 1, by making the thickness T 1 of the tabular end 102B that is positioned at shearing side thicker than the thickness T of tabular end 102A 2, just can eliminate the metal deficiency of the central portion of plastification region W, and make to engage better.

In variation 2, as shown in Figure 19 (b), on different these aspects of thickness of tabular end 102C and tabular end 102D, different from the embodiment described above. The thickness T 1 of tabular end 102C is thicker than the thickness T of tabular end 102D 2. In variation 2, by tabular end 102C with tabular end 102D so that the overlapping mode of mid point in the short transverse of the mid point in the short transverse of tabular end 102C and tabular end 102D dock.

In the docking operation of variation 2, make twin shaft shoulder stir head dummy instrument 5 towards anticlockwise, tabular end 102C (metallic plate) larger the thickness of the docking section N of tabular end 102C is configured in to the right side of direct of travel.

In variation 2, utilize the principle identical with variation 1, make the thickness T 1 of the tabular end 102C that is positioned at shearing side thicker than the thickness T of tabular end 102D 2, just can eliminate the metal deficiency of the central portion of plastification region W, and make to engage better.

[embodiment 4]

Below, embodiment of the present invention 4 is described. In embodiment 4, illustrate the situation that double face slab is engaged. Up, down, left, right, before and after is in description of the present embodiment according to the arrow of Figure 20.

As shown in figure 20, double face slab 201 is metal slim strip component, and it is mainly made up of outside plate 202, inner panel 203, support plate 204,204. Each support plate 204 is perpendicular to outside plate 202 and inner panel 203. By on left and right directions, multiple double face slabs 201 being engaged, just as the such as structure of rolling stock, aircraft, boats and ships, civil construction thing etc. The manufacture method of double face slab 201 has no particular limits, and still, in the present embodiment, double face slab 201 is that the mode by pressing shaping forms. The metal of the material of double face slab 201 as long as rubbing and stir, not special restriction, but in the present embodiment, use aluminium alloy.

Outside plate 202 extends by central portion 205, from central portion 205 towards right side the tabular end 210, right side arranging and the tabular end 220, left side of extending setting from central portion 205 towards left side forms.

Tabular end 210, right side is made up of the first outside plate heavy section 211, the first hook portion 212 and the first covering part (Japanese: the first meat Sheng portion) 213. The first outside plate heavy section 211 is perpendicular to support plate 204, and extends and arrange towards right side. The first hook portion 212 is hook-shaped, its by towards right side extend arrange the first thinner wall section 214 with form from vertical the first extension 215 stretching out of the first thinner wall section 214. The thickness of the first thinner wall section 214 is 1/3rd left and right of the first outside plate heavy section 211.

The first extension 215 stretches out towards inner panel 203 sides from the front end of the first thinner wall section 214. Be formed with to stretch out inclined plane 216 along with just tilt the closer to the mode of support plate 204 towards inner panel 203 sides first at the sidepiece of the first extension 215. The first covering part 213 is give prominence to certain thickness towards top and be formed on the position heavy wall from the upper surface of the first outside plate heavy section 211, the first thinner wall section 214 and the first extension 215.

Tabular end 220, left side is mainly made up of the second outside plate heavy section 221, the second hook portion 222 and the second covering part 223. The second outside plate heavy section 221 is perpendicular to support plate 204, and extends and arrange towards left side. The second hook portion 222 is hook-shaped, and it is made up of second thinner wall section 224 of extending towards left side and the second extension 225 of vertically stretching out with respect to the second thinner wall section 224. The thickness of the second thinner wall section 224 is 1/3rd left and right of the second outside plate heavy section 221.

The second extension 225 stretches out towards a side contrary with inner panel 203 from the front end of the second thinner wall section 224. Be formed with the second heavy section inclined plane 226 along with just tilting away from the mode of support plate 204 towards inner panel 203 sides at the left end of the second outside plate heavy section 221. It is identical that the angle of inclination on inclined plane 216 is stretched out on the second heavy section inclined plane 226 and first. The second covering part 223 is give prominence to certain thickness towards top and be formed on the position heavy wall from the upper surface of the second outside plate heavy section 221.

Inner panel 203 extends the tabular end 230, right side arranging by central portion 206, from central portion 206 towards right side, the tabular end 240, left side of extending setting from central portion 206 towards left side forms.

Tabular end 230, right side is made up of the first inner panel heavy section 231, the first covering part 232, the first end face 233. The first inner panel heavy section 231 is perpendicular to support plate 204, and extends and arrange towards right side. The first covering part 232 is outstanding from the following table faced downwards of the front of the first inner panel heavy section 231, and becomes the position of heavy wall.

Tabular end 240, left side is made up of the second inner panel heavy section 241, the second covering part 242, the second end face 243. The second inner panel heavy section 241 is perpendicular to support plate 204, and extends and arrange towards left side. The second covering part 242 is outstanding from the following table faced downwards of the front of the second inner panel heavy section 241, and becomes the position of heavy wall.

Then, the friction agitating device using is in the present embodiment described. As shown in Figure 21, Figure 22, friction agitating device 261 is made up of the 261a of chuck portion, the throw unit 262 that is fixed on the 261a of chuck portion. With embodiment 2 similarly, the 261a of chuck portion by bolt with friction agitating device 261 main body (not shown) engage.

Throw unit 262 stirs head dummy instrument 265 by keeper 263, sliding axle 264 and twin shaft shoulder and forms.

As shown in figure 22, keeper 263 is the members that are built-in with sliding axle 264 and are arranged on the inside of the 261a of chuck portion. Keeper 263 is cylindric. Be formed with the keyway 263b of the slotted hole shape connecting on radial direction at keeper 263.

As shown in figure 22, sliding axle 264 is cylindric, and it is the member being inserted in the hollow bulb of keeper 263. Sliding axle 264 can move up at upper and lower with respect to keeper 263. On the outer surface of sliding axle 264, be formed with outstanding toward the outer side key 264a. By key 264a is engaged with keyway 263b, by this, just can make keeper 263 and sliding axle 264 rotate integratedly.

As shown in figure 23, twin shaft shoulder stir head dummy instrument 265 by the first shaft shoulder portion 252, the second shaft shoulder portion 253 and be arranged on the first shaft shoulder portion 252 and the second shaft shoulder portion 253 between threaded 254 form. The first shaft shoulder portion 252, the second shaft shoulder portion 253, threaded 254 are all roughly cylindric, and coaxially arrange. It is by making threaded 254 move bonding part in High Rotation Speed that twin shaft shoulder stirs head dummy instrument 265, rubs and stirs the instrument engaging.

The first shaft shoulder portion 252 comprises large-diameter portion 252a, tapering 252b and lower surface 252c. Tapering 252b undergauge gradually downward. Though not shown, be formed with around around threaded 254 and overlook the depressed part that is vortex shape at the lower surface 252c of the first shaft shoulder portion 252.

The second shaft shoulder portion 253 is formed as having at outer surface the structure of groove. The second shaft shoulder portion 253 comprises large-diameter portion 253a, tapering 253b and upper surface 253c. Tapering 253b undergauge gradually upward. The diameter β 1 of large-diameter portion 253a is less than the diameter α 1 of large-diameter portion 252a. In addition, the diameter β 2 of upper surface 253c is identical with the diameter α 2 of lower surface 252c.

Carve and be provided with the helicla flute 255 forming in the mode of left-hand thread at the outer surface of threaded 254. That is to say, helicla flute 255 is carved and is established in the mode towards anticlockwise from the top down. External diameter U diameter group α 2 and the diameter β 2 of threaded 254 are little. The first shaft shoulder portion 252 is connected with sliding axle 264 by nut.

Comparatively it is desirable to, the distance (length of the exposed portions serve of threaded 254) between the shaft shoulder portion of twin shaft shoulder stirring head dummy instrument 265 is set as below the thickness of slab (being the total of the thickness of the first outside plate heavy section 211 and the first covering part 213 in the present embodiment) of the part that will engage. The degree of depth or the spacing etc. of the groove of helicla flute 255 is as long as carry out suitably setting according to the distance that will rub between the material of metallic plate or thickness of slab, the shaft shoulder portion of the part that will engage of stirring etc.

In friction agitating device 261, because sliding axle 264 is formed as moving with respect to keeper 263, therefore, friction agitating device 261 be configured to the metallic plate that will engage for example towards above when warpage, twin shaft shoulder stir head dummy instrument 265 can along with above-mentioned warpage towards top mobile predetermined distance. On the other hand, friction agitating device 261 be configured to the metallic plate that will engage towards below when warpage, twin shaft shoulder stir head dummy instrument 265 can along with above-mentioned warpage towards below mobile predetermined distance. By this, can suppress friction stirring joint time, twin shaft shoulder stirs the position skew of head dummy instrument 265 with respect to metallic plate.

Then, the joint method of the double face slab to present embodiment describes. At this, illustrate situation about engaging after the double face slab of two same shapes 201 is arranged side by side. In above-mentioned joint method, carry out preparatory process and bonding process.

In preparatory process, as shown in figure 24,201,201 pairs of double face slabs are fetched and form the assembly of double face slab, and fix this assembly it can not be moved. In explanation, a side double face slab is labeled as to " 201A ", the opposing party's double face slab is labeled as to " 201B ", for the each self-corresponding key element of above-mentioned double face slab, can add that symbol " A ", symbol " B " distinguish.

In preparatory process, specifically, the first hook portion 212A of double face slab 201A and the second hook portion 222B of double face slab 201B are engaged, and the first end face 233A is docked with the second end face 243B. By this, the first hook portion 212A engages very close to each otherly with the second hook portion 222B, forms holding section M. On the other hand, after the first end face 233A docks with the second end face 243B, form docking section N. The extended line at the position that the position that extension 215A is engaged with extension 225B and the first end face 233A dock with the second end face 243B is called " center line C1 ".

Carrying out after preparatory process, the upper surface flush of the upper surface of the first covering part 213A and the second covering part 223B, meanwhile, the lower surface of the first outside plate heavy section 211A flushes with the lower surface of the second outside plate heavy section 221B. In addition, the upper surface of the first inner panel heavy section 231A flushes with the lower surface of the second inner panel heavy section 241B, and meanwhile, the lower surface of the first covering part 232A flushes with the lower surface of the second covering part 242B. Forming after the assembly of double face slab, using fixture to fix this assembly it can not be moved.

In bonding process, as shown in figure 25, the first bonding process holding section M being engaged with twin shaft shoulder stirring head dummy instrument 265 and the second bonding process that docking section N is engaged.

In the first bonding process, make double face slab 201A be configured in the left side of direct of travel. Then,, after the center of the short transverse of the holding section M on the Center-to-Center line C1 of the threaded 254 of the twin shaft shoulder stirring head dummy instrument 265 towards right rotation is aimed at, insert holding section M. Then, rub and stir joint along holding section M from front side towards rear side. In addition, the track moving along twin shaft shoulder stirring head dummy instrument 265 on the M of holding section is formed with plastification region W1 (with reference to Figure 26).

In the second bonding process, as shown in figure 26, after the first bonding process finishes, the assembly of double face slab is turned over, and the assembly of again fixing double face slab can not move it. Then,, after the center of the short transverse of the docking section N on the Center-to-Center line C1 of the threaded 254 of the twin shaft shoulder stirring head dummy instrument 265 towards right rotation is aimed at, insert docking section N. Then, rub and stir joint along docking section N from front side towards rear side. The track moving along twin shaft shoulder stirring head dummy instrument 265 on the N of docking section is formed with plastification region (not shown). By above operation, outside plate 202A engages with outside plate 202B, and inner panel 203A engages with inner panel 203B.

According to the friction stirring connecting method of present embodiment described above, by the first hook portion 212A of outside plate 202A and the second hook portion 222B of outside plate 202B are engaged, the double face slab 201A while stirring joint that can prevent from simply rubbing separates with double face slab 201B. On the other hand, at inner panel 203A and inner panel 203B, hook portion is not set, and the first end face 233A is docked with the second end face 243B, by this, can make the manufacture of preparatory process or double face slab more laborsaving. , if inner panel 203A and inner panel 203B also arrange hook portion, can make the operation of engaging become difficulty, but according to present embodiment, can make to engage operation and become easy be rectangular in the situation that at double face slab 201A, 201B.

In addition, in preparatory process, in the time that the first hook portion 212A is engaged with the second hook portion 222B, can make first to stretch out inclined plane 216A and the second main body inclined plane 226B and engage in sliding, therefore, make to engage operation and become easy. Specifically, while putting down double face slab 201A from the top of loaded double face slab 201B, as long as make first to stretch out inclined plane 216A and the second main body inclined plane 226B and slide, just can make first to stretch out inclined plane 216A and engage with the second main body inclined plane 226B.

In addition, by the first extension 215A and the second extension 225B are set, just can engage with simple structure. In addition, by covering part (213A, 223B, 232A, 242B) is set, metal deficiency just can prevent friction stirring joint time. In the present embodiment, be provided with the helicla flute 255 of left-hand thread 254 quarters at threaded, and make twin shaft shoulder stir head dummy instrument 265 in right rotation from front side side shifting backwards, therefore, metal after Plastic Flow is guided by helicla flute 255, and has the trend moving towards the second shaft shoulder portion 253. Thereby, by covering part (213A, 223B, 232A, 242B) being arranged on to a side in outside plate 202A, 202B and inner panel 203A, 203B, relative with the first shaft shoulder portion 252, just can avoid the metal deficiency of the first shaft shoulder portion 252 sides.

In addition, when formerly docking section N joint, double face slab 201A, 201B likely can separate, but in the bonding process of present embodiment, owing to first holding section M being engaged, therefore, can prevent that double face slab 201A, 201B divide out in the time that docking section N is engaged.

In addition, the form that the shape of double face slab 201A, 201B or engaging form can not be separated as long as both, not special restriction. Comparatively it is desirable to, as present embodiment, the end of double face slab 201A, 201B is flushed, and very close to each other engage. In addition, also can form the member that is provided with the first hook portion 212,212 at the two ends of the outside plate of a double face slab 202, form and be provided with the member of the second hook portion 222,222 at the two ends of the outside plate 202 of another double face slab, and engage and engage after above-mentioned double face slab is alternately arranged side by side. In addition, can also be as shown in figure 27, the sidepiece that makes the first extension 215A and the second extension 225B is the shape that inclination is not set. In addition in the present embodiment, though support plate 204 is vertically formed with outside plate 202 and inner panel 203, also can tilt.

Use the friction agitating device 1 (twin shaft shoulder stirs head dummy instrument 5) of embodiment 2, carry out for stir the thickness of the metallic plate (tabular end) engaging and the test what kind of impact metallic plate gap each other brings investigate on engagement state to rubbing. As shown in figure 28, stir the test body (materials A 6063-T5) of the pair of metal plate engaging for rubbing, make its thickness change respectively to prepare to test body H1～H19. " Ad side " refers to that twin shaft shoulder stirs a direction of rotation side identical with direct of travel of head dummy instrument. That is to say, twin shaft shoulder refers to the left side of direct of travel while stirring head dummy instrument towards right rotation. " Re side " refers to that twin shaft shoulder stirs a direction of rotation side contrary with direct of travel of head dummy instrument. That is to say, twin shaft shoulder refers to the right side of direct of travel while stirring head dummy instrument towards right rotation.

In test body H1～H7, make metal thickness identical in Ad side and Re side. In test body H8～H13, Ad side plate thickness is fixed as to 6.0mm, Re side plate thickness is changed. In test body H14～H19, Re side plate thickness is fixed as to 6.0mm, Re side plate thickness is changed.

Gap between metallic plate is each 0.25mm that changes between 0～2.0mm. The shaft shoulder portion external diameter (diameter of face in shaft shoulder portion, that contact with metallic plate) that the twin shaft shoulder using in test stirs head dummy instrument is set as 20mm, and threaded external diameter is set as 12mm, and the distance between shaft shoulder portion is set as 5.8mm. The speed setting that twin shaft shoulder stirs head dummy instrument is 800rpm, and translational speed is set as 600/min, and direction of rotation is set as towards right rotation. In addition, as embodiment 2 is recorded, the form that the height and position that above-mentioned twin shaft shoulder stirring head dummy instrument is twin shaft shoulder stirring head dummy instrument can change along with the warpage of metallic plate. After the stirring that rubs engages, judge bond quality from the micro-tissue of X ray penetration test and cross section.

Figure 29 is illustrated in embodiment 1, the figure of the relation between the gap of test body H1 and the thickness at junction surface. Figure 30 is illustrated in embodiment 1, the figure of the relation between the gap of test body H3 and the thickness at junction surface. The junction surface of embodiment 1 be with embodiment in plastification region W identical meanings. In addition each position of the Ad portion at the junction surface (plastification region W) shown in " the Ad portion " at the junction surface of embodiment 1, " Cr portion ", " Re portion " expression Figure 16 (b), central portion, Re portion.

As shown in figure 29, in the time the thickness of metallic plate be all set as to 6.0mm each other engage, if the not enough 0.75mm in gap, the minimizing of the thickness of Ad portion, Cr portion, Re portion is all very little, if but gap is more than 0.75mm, along with gap increases, the thickness of Ad portion, Cr portion, Re portion all reduces. Once gap exceedes 1.2mm, the not enough 5.8mm of the thickness at junction surface and produce joint defect.

As shown in figure 30, in the time the thickness of metallic plate is all set as to 6.4mm each other engages, if the not enough 0.75mm in gap, the minimizing of the thickness of Ad portion, Cr portion, Re portion is all very little. If gap, at 0.75～1.75mm, although the thickness of Ad portion, Cr portion, Re portion all can reduce, does not produce joint defect. Once gap reaches 2.0mm, the thickness at junction surface can reduce significantly and produce joint defect.

From Figure 29 and Figure 30, if the thickness of the Cr portion at junction surface is below 5.8mm, can produce joint defect. That is to say, even if there is each other gap in metallic plate, as long as supply with metal by Plastic Flow so that the thickness of the Cr portion at junction surface can not be less than with shaft shoulder portion between the identical 5.8mm of distance, just can intactly engage. As known from the above, need to set engaging condition, so that the thickness in junction surface (plastification region) is more than the distance between shaft shoulder portion.

Figure 31 is illustrated in embodiment 1, affects the table of the relation between plate thickness and the gap of bond quality, and it shows the situation of the thickness of thickness=Re side of Ad side. In the drawings, "○" represents the situation that connecting state is good, and "×" represents the situation that connecting state is bad.

Known according to Figure 31, even if gap increases, as long as metallic plate also increases, still have the situation that connecting state is good. But the difference between the distance between thickness and the shaft shoulder portion of metallic plate exceedes 0.8mm (in the present embodiment, the Thickness Ratio 6.6mm of metallic plate is large) if can know, the interior pressure producing between shaft shoulder portion becomes large, and the life-span of instrument is significantly declined.

In addition, known according to Figure 31, the distance between shaft shoulder portion is 5.8mm, and the gap between metallic plate is 0～0.75mm when following, as long as the thickness of metallic plate is 5.8～6.6mm, connecting state is good. That is to say, as long as set the distance Z between the thickness T of metallic plate and shaft shoulder portion for 0≤T-Z≤0.8mm, connecting state is good.

In the situation that T-Z value is less than 0, that is to say, in the time that the distance Z between shaft shoulder portion is larger than the thickness T of tabular end 102, metal after Plastic Flow easily overflows from the first shaft shoulder portion 11 and the second shaft shoulder portion 12 (with reference to Figure 16 (a)), therefore, the density of junction surface (plastification region W) reduces. By this, the possibility that joint defect produces improves. The in the situation that of 0≤T-Z≤0.8mm, even if metallic plate gap is to each other 0～0.75mm, also can stirs the frictional heat engaging because of friction and make the temperature rise of metallic plate, and because metallic plate expands, gap be disappeared, therefore, can think that connecting state is roughly good.

In addition, known according to Figure 31, the distance between shaft shoulder portion is 5.8mm, and metallic plate gap is each other 0～1.0mm when following, as long as the thickness of metallic plate is 6.0～6.6mm, connecting state is good. That is to say, can know that connecting state is good as long as set the distance Z between the thickness T of metallic plate and shaft shoulder portion for 0.2≤T-Z≤0.8mm. If T-Z value is less than 0.2mm, the metal after Plastic Flow easily overflows from the first shaft shoulder portion 11 and the second shaft shoulder portion 12, and therefore, the density at junction surface reduces. By this, the possibility that joint defect produces improves.

In addition, known according to Figure 31, the distance between shaft shoulder portion is 5.8mm, and the gap between metallic plate is for being greater than 1.0mm and for 1.75mm is when following, as long as the thickness of metallic plate is 6.2～6.6mm, connecting state is good. That is to say, can know that connecting state is good as long as set the distance Z between the thickness T of metallic plate and shaft shoulder portion for 0.4≤T-Z≤0.8mm. If T-Z value is less than 0.4mm, the metal after Plastic Flow easily overflows from the first shaft shoulder portion 11 and the second shaft shoulder portion 12, and therefore, the density at junction surface reduces. By this, the possibility that joint defect produces improves.

Known according to Figure 31, the distance between shaft shoulder portion is 5.8mm, and metallic plate gap is each other for being greater than 1.75mm and for 2.00mm is when following, as long as the thickness of metallic plate is 6.6mm, connecting state is good. That is to say, can know that connecting state is good as long as set the spacing Z of the thickness T of metallic plate and shaft shoulder portion for T-Z=0.8mm. If T-Z value is less than 0.8mm, because the metal after Plastic Flow easily overflows from the first shaft shoulder portion 11 and the second shaft shoulder portion 12, therefore, the density at junction surface is reduced. By this, the possibility that joint defect produces improves.

Figure 32 is the table that represents the relation between thickness and the gap of the metallic plate that affects bond quality, its show make Ad side varied in thickness and by the situation fixing thickness of Re side. Figure 33 is the table that represents the relation between thickness and the gap of the metallic plate that affects bond quality, and it shows fixes the thickness of Ad side and makes the situation of the varied in thickness of Rd side.

In the test of Figure 32, the thickness of Re side is fixed as to 6.0mm, and the thickness of Ad side is suitably changed, rubbing to stir engages. In the test of Figure 33, the thickness of Ad side is fixed as to 6.0mm, and the thickness of Re side is suitably changed, rubbing to stir engages. That is to say, in the test of Figure 32 and Figure 33, make the varied in thickness of the left and right of the metallic plate that will dock on one side, observe the bond quality under different gap on one side.

By after Figure 32 and Figure 33 contrast, the good situation in Figure 32 is more. In other words, shown in figure 32, the metallic plate of Re side is being fixed as to 6.0mm, and the metallic plate of Ad side is changed more than 6.2mm in the situation that, the situation that connecting state is good is more. This is owing to making twin shaft shoulder stir head dummy instrument towards right rotation in embodiment 1, therefore, metal after plastification is flowed easily from the left side (Ad side) of direct of travel towards right side (Re side) mobile, in the situation that metallic plate exists gap to each other, the metal of Ad side can this gap of landfill. Therefore, if as the condition of Figure 33, make the plate thickness on Thickness Ratio direct of travel right side of the metallic plate in direct of travel left side little, the metal deficiency of junction surface central authorities, and it is higher to make to engage bad possibility. But, if as the condition of Figure 32, make the plate thickness in direct of travel left side larger than the plate thickness on direct of travel right side, the metal deficiency that can supplement junction surface central authorities, therefore, can obtain good engagement state.

Above-mentioned result also can be confirmed from Figure 34 and Figure 35. Plot point " ◆ " represents test body H4 (thickness=6.6mm of the thickness=6.6mm of Ad side and Re side). Plot point " ■ " represents test body H10 (thickness=6.6mm of the thickness=6.0mm of Ad side and Re side), and plot point "●" represents to test body H16 (thickness=6.0mm of the thickness=6.6mm of Ad side and Re side).

As shown in Figure 34 (a), can know in the thickness of the Cr at junction surface portion, diminish according to the order of test body H4, H16, H10. That is to say, if can know, the metallic plate of Ad side is thinner than Re side, and the Cr portion thickness at junction surface will diminish.

As shown in Figure 34 (b), can know in the thickness of the Ad at junction surface portion, test body H4, H10, H16 are 5.8mm left and right, and reduce to some extent than the thickness before engaging. Particularly, in the time of viewing test body H4, H16, can know that thickness has the minimizing of certain degree.

As shown in Figure 35 (a), can know in the thickness of the Re at junction surface portion, the thickness of test body H10, H16 does not have very large difference, but the thickness of test body H4 is larger generally. In addition,, if by Figure 34 (b) and Figure 35 (a) overall contrast, the thickness of known Re portion is larger than the thickness of Ad portion generally.

As shown in Figure 35 (b), can know that the average thickness at junction surface increases by the order of test body H10, H16, H4.

As shown in Figure 34, Figure 35, service test body H4, H16, compared with test body 10, can increase the thickness of Cr portion. But, if service test body H4, although can increase the thickness at junction surface, correspondingly can make the interior pressure between shaft shoulder portion become large and the possibility that reduce life tools is improved. Therefore, by as testing body H16, the thickness of the metallic plate of Ad side is set as larger than the thickness of the metallic plate of Re side, not only can makes the internal drop between shaft shoulder portion low, and can increase the thickness of the Cr portion at junction surface.

Use the friction agitating device 1 (twin shaft shoulder stirs head dummy instrument 5) of embodiment 2, carry out for stir the thickness of the metallic plate (tabular end) engaging and the test what kind of impact metallic plate gap each other brings investigate on engagement state to rubbing. Metallic plate gap is each other each 0.25mm that changes between 0～2.0mm. The shaft shoulder portion external diameter (diameter of face in shaft shoulder portion, that contact with metallic plate) that the twin shaft shoulder using in test stirs head dummy instrument is set as 10mm, and threaded external diameter is set as 6mm, and the distance between shaft shoulder portion is set as 2.8mm. The speed setting that twin shaft shoulder stirs head dummy instrument is 2000rpm, and translational speed is set as 1000mm/min, and direction of rotation is set as towards right rotation. In addition, as embodiment 2 is recorded, the form that the height and position that above-mentioned twin shaft shoulder stirring head dummy instrument is twin shaft shoulder stirring head dummy instrument can change along with the warpage of metallic plate. After the stirring that rubs engages, judge bond quality from the micro-tissue of X ray penetration test and cross section.

Stir the test body (materials A 6063-T5) of the metallic plate engaging for rubbing, use Ad side identical with the plate thickness of Rd side, but the test body that thickness changes between 3.0mm, 3.2mm, 3.4mm.

Figure 36 is illustrated in embodiment 2, affects the figure of the relation between thickness and the gap of metallic plate of bond quality, and it shows the situation of Ad side=Re side. In the drawings, "○" represents the situation that connecting state is good, and "×" represents the situation that connecting state is bad.

Known according to Figure 36, even if gap increases, as long as the thickness of metallic plate also increases with respect to the distance Z between shaft shoulder portion, still have the situation that connecting state is good. But the difference between the distance between thickness and the shaft shoulder portion of metallic plate exceedes 0.6mm (in the present embodiment, the Thickness Ratio 3.4mm of metallic plate is large) if can know, the interior pressure producing between shaft shoulder portion becomes large, and the life-span of instrument is significantly declined.

In addition, known according to Figure 36, the distance Z between shaft shoulder portion is 2.8mm, and the gap between metallic plate is 0.75mm when following, as long as the thickness of metallic plate is 3.0～3.4mm, connecting state is good. That is to say, can know that connecting state is good as long as set the spacing Z of the thickness T of metallic plate and shaft shoulder portion for 0.2≤T-Z≤0.6mm. If T-Z value is less than 0.2, the metal of Plastic Flow easily overflows from the first shaft shoulder portion 11 and the second shaft shoulder portion 12, and the density at junction surface is reduced. By this, the possibility that joint defect produces improves. If the gap between metallic plate is below 0.75mm, the frictional heat engaging because of friction stirring makes the temperature rise of metallic plate, because metallic plate expands, gap is disappeared, and therefore, can think that connecting state is roughly good.

In addition, known according to Figure 36, the distance between shaft shoulder portion is 2.8mm, and metallic plate gap is each other for being greater than 0.75mm and for 1.50mm is when following, as long as the thickness of metallic plate is 3.2～3.4mm, connecting state is good. That is to say, can know that connecting state is good as long as set the spacing Z of the thickness T of metallic plate and shaft shoulder portion for 0.4≤T-Z≤0.6mm. If T-Z value is less than 0.4mm, the metal after Plastic Flow easily overflows from the first shaft shoulder portion 11 and the second shaft shoulder portion 12, and the density at junction surface is reduced. By this, the possibility that joint defect produces improves.

In addition, known according to Figure 36, the distance between shaft shoulder portion is 2.8mm, and metallic plate gap is each other for being greater than 1.50mm and for 1.75mm is when following, as long as the thickness of metallic plate is 3.4mm, connecting state is good. That is to say, as long as set the spacing Z of the thickness T of metallic plate and shaft shoulder portion for T-Z=0.6mm, connecting state is good.

In addition, known according to Figure 36, if gap is 2.0mm, though the thickness of metallic plate be 3.4mm also can produce engage bad.

Figure 37 is illustrated in embodiment 1, and when the distance between shaft shoulder portion is fixed as to 5.8mm, each twin shaft shoulder stirs the size of head dummy instrument and the table of connecting state. Figure 38 is illustrated in embodiment 2, and when the distance between shaft shoulder portion is fixed as to 2.8mm, each twin shaft shoulder stirs the size of head dummy instrument and the table of connecting state. Figure 39 is illustrated in reference example, and when the distance between shaft shoulder portion is fixed as to 11.5mm, each twin shaft shoulder stirs the size of head dummy instrument and the table of connecting state. At Figure 37, Figure 38, Tu39Zhong, show tensile resistence/material resistance, fracture resistence force/material resistance, material maintenance trend.

Tensile resistence/material resistance is by Y²/(X²－Y²) represent. That is to say, the upper surface of the lower surface of the first shaft shoulder portion 11 and the second shaft shoulder portion 12 is because being subject to pressing of metal after Plastic Flow in the time that friction is stirred, and therefore, tensile stress acts on threaded 13. Therefore, tensile resistence/material resistance uses the square value of the external diameter X of the lower surface of the first shaft shoulder portion 11 (upper surface of the second shaft shoulder portion 12) (diameter of face in shaft shoulder portion, that contact with metallic plate) is deducted to the value (X obtaining after the square value of external diameter Y of threaded 13²－Y²), and the value after divided by value obtained above represents by the square value of the external diameter Y of threaded 13.

Fracture resistence force/material resistance is by Y²/ YZ represents. That is to say, in the time that twin shaft shoulder stirs head dummy instrument 5 docking section N is moved, effect has the power with the axial vertical direction of threaded 13. Therefore, fracture resistence force/material resistance uses the value after divided by the sectional area YZ in the cross section including axle of threaded 13 by the square value of the external diameter of threaded 13 to represent.

Material keeps trend by X²/Y²Represent. That is to say, in the time that friction is stirred, the metal after Plastic Flow is kept by the upper surface of the lower surface of the first shaft shoulder portion 11 and the second shaft shoulder portion 12. Therefore, material maintenance trend is used the value after divided by the square value of the external diameter Y of threaded 13 by the square value of the external diameter X (diameter of the face contacting in shaft shoulder portion, with metallic plate) of the first shaft shoulder portion 11 (the second shaft shoulder portion 12) to represent.

After Figure 37, Figure 38, Figure 39 are analyzed, if known material keeps trend (X²/Y²) be that below 2.0, joint defect easily produces, if larger than 2.0, joint defect can not produce. If material keeps trend (X²/Y²) be below 2.0, because the external diameter Y of threaded 13 is excessively thick with respect to the external diameter of the first shaft shoulder portion 11 (the second shaft shoulder portion 12), therefore, can think that the area of shaft shoulder portion that metal is pressed diminishes, thereby, cannot press the metal after being stirred by friction fully, metal just can produce burr, and overflows from the outside of shaft shoulder portion. On the other hand, if material keeps trend (X²/Y²) larger than 2.0,, for the external diameter Y of threaded 13, the external diameter X of the first shaft shoulder portion 11 (the second shaft shoulder portion 12) is large, therefore, can use the metal after two shaft shoulder portions flow to plastification fully to press. By this, can think that joint defect is not easy to produce.

In addition, after Figure 37, Figure 38, Figure 39 are analyzed, if known tensile resistence/material resistance (Y²/(X²－Y²)) be below 0.2, threaded is easily damaged. This is due to tensile resistence/material resistance (Y²/(X²－Y²)) be below 0.2 time, threaded external diameter Y diminishes with respect to the external diameter X of shaft shoulder portion, therefore, can think tensile resistence deficiency with respect to the material resistance producing in the axial direction of in the time engaging threaded, and threaded 13 is easily fractureed. If tension stress/material resistance (Y²/(X²－Y²)) larger than 0.2, can think that the relative shaft shoulder of the threaded external diameter Y external diameter X of portion becomes large, therefore, threaded 13 is not easy to fracture.

In addition, after Figure 37, Figure 38, Figure 39 are analyzed, if known fracture resistence force/material resistance (Y²/ YZ) be below 1.2, threaded 13 is easily damaged. This is due at fracture resistence force/material resistance (Y²/ YZ) be below 1.2 time, less distance (length of the threaded) Z of the external diameter Y of threaded with respect between the shaft shoulder, therefore, can think that in the time engaging threaded is for the fracture resistence force deficiency along the mobile material of the direction contrary with instrument direct of travel, and threaded 13 is easily fractureed. If fracture resistence force/material resistance (Y²/ YZ) be greater than 1.2, larger distance (length of the threaded) Z of threaded external diameter Y with respect between shaft shoulder portion, therefore, threaded 13 is not easy to fracture.

In addition, after Figure 37, Figure 38, Figure 39 are analyzed, known as tension stress/material resistance (Y²/(X²－Y²)) be below 0.2, or fracture resistence force/material resistance (Y²/ YZ) be below 1.2 time, can there is breakage in threaded. But, as tension stress/material resistance (Y²/(X²－Y²)) be greater than 0.2 and fracture resistence force/material resistance (Y²/ YZ) be greater than at 1.2 o'clock, threaded can be not damaged. Therefore, can obtain as drawn a conclusion: the threaded that twin shaft shoulder stirs head dummy instrument when preventing from engaging occurs damaged, comparatively it is desirable to, the shape of threaded is designed to distance (length of the threaded) Z between the external diameter X of shaft shoulder portion, threaded external diameter Y and shaft shoulder portion meets with following formula (1), (2) simultaneously.

Y²/(X²－Y²)＞0.2…………(1)

Y²/YZ＞1.2…………………(2)

In embodiment 3, bring what kind of impact to investigate carving spiral fluted ratio and the spiral fluted direction of rotation of establishing on the threaded of twin shaft shoulder stirring head dummy instrument on the metallic plate after engaging. With reference to Figure 16 (a), the direction of rotation of twin shaft shoulder stirring head dummy instrument is set for from sliding axle side and is viewed as towards right rotation. In addition, the ratio of the top helicla flute 13a of right-hand thread and the lower part helical groove 13b of left-hand thread is changed, set five kinds of condition A～E, and rub and stir joint.

In condition A, the ratio of the lower part helical groove 13b of the top helicla flute 13a of right-hand thread and left-hand thread is set as to 0:100 (there is no right-hand thread).

In condition B, the ratio of the lower part helical groove 13b of the top helicla flute 13a of right-hand thread and left-hand thread is set as to 25:75.

In condition C, the ratio of the lower part helical groove 13b of the top helicla flute 13a of right-hand thread and left-hand thread is set as to 50:50.

In condition D, the ratio of the lower part helical groove 13b of the top helicla flute 13a of right-hand thread and left-hand thread is set as to 75:25.

In condition E, the ratio of the lower part helical groove 13b of the top helicla flute 13a of right-hand thread and left-hand thread is set as to 100:0 (there is no left-hand thread).

In embodiment 3, prepare the metallic plate (A6063-T5) of the aluminium alloy that the thick T of two boards is 6.2mm, and two metallic plates are engaged. Twin shaft shoulder stirs the first shaft shoulder portion 11 of head dummy instrument 5 and the external diameter X (diameter of face in shaft shoulder portion, that contact with metallic plate) of the second shaft shoulder portion 12 is set as 20mm, the external diameter Y of threaded 13 is set as 12mm, and the distance Z between shaft shoulder portion is set as 5.8mm. The helicla flute degree of depth is set as 0.81mm. The speed setting that twin shaft shoulder stirs head dummy instrument 5 is 800rpm, and engaging speed is set as 600mm/min. In addition, in each condition, for to and docking section N between relation investigate, after space change is 0mm, 1.25mm, 1.50mm, 1.75mm, 2.00mm, test.

Figure 40 is illustrated in embodiment 3, the figure of the impact (gap of docking section is 0mm) that screw thread ratio is brought the difference of height of metallic plate. Figure 41 is illustrated in embodiment 3, the figure of the impact (gap of docking section is 1.5mm) that screw thread ratio is brought metallic plate difference of height. Difference of height be the surface of the metallic plate before engaging be benchmark (benchmark=0), represent the height and position at the each position after engaging. Difference of height on the occasion of time represent to be convex, during for negative value, represent to be concavity (groove).

As shown in figure 40, the Re side of surperficial Sa that uses " ▲ " to represent in condition A～E, be all expressed as on the occasion of. That is to say, the Re side of surperficial Sa is convex all the time.

On the other hand, use the Ad side of the surperficial Sa of " ◆ " expression in condition A, to be expressed as very large negative value. That is to say, in condition A, the Ad side of surperficial Sa is very large concavity. In addition,, in the Ad side of the surperficial Sa that uses " ◆ " to represent, along with the increase of right-hand thread ratio, the depression of the Ad side of surperficial Sa progressively reduces, and in condition E, is convex.

On the other hand, the Ad side of back side Sb that uses " ■ " to represent in condition A, be expressed as very large on the occasion of. That is to say, in condition A, the Ad side of back side Sb is very large convex. In addition,, in the Ad side of the back side Sb that uses " ■ " to represent, along with the increase of right-hand thread ratio, the depression of the Ad side of back side Sb increases gradually, in condition D, E, is concavity. That is to say, use the Ad side of the back side Sb of Ad side and use " ■ " expression of the surperficial Sa that " ◆ " represent, in being contrary relation with the ratio of right-hand thread. In addition the Ad side of the surperficial Sa that, use " ◆ " represents and use " ■ " are even the Ad side of the back side Sb representing, under condition C (50:50), is also just slightly concavity.

After Figure 40 and Figure 41 are contrasted, even if the gap of known docking section is 1.5mm, while being 0mm in the gap of docking section, the trend of difference of height does not also almost change. Can know the Re side of the surperficial Sa that the use " ▲ " of Figure 41 represents and to use the value of Re side of the back side Sb that represents of "●" little compared with Figure 40 on the whole.

Figure 42 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition A. Figure 43 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition B. Figure 44 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition C. Figure 45 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition D. Figure 46 is illustrated in embodiment 3, different in the gap of docking section, the figure in the plastification region of the metallic plate of condition E. The left hurdle of each figure in Figure 42～Figure 46 has represented to carry out the cutaway view of micro-structure observation of plastification region W, intermediate hurdles represent the top view of surface (decorative cover) the Sa side of plastification region W, and right hurdle represents the top view of the back side Sb side of plastification region W.

As shown in the left hurdle of Figure 42, the in the situation that of condition A, on surface, (decorative cover) Sa side is formed with very large groove V, but Sb side does not form groove V overleaf. In the time that the gap of docking section is 1.75mm, 2.00mm, surperficial Sa side forms joint defect Q. Plastification region W expands gradually towards back side Sb. The lines of plastification region W is that left and right is asymmetrical. The lines of the Ad side of plastification region W is darker than the lines of Re side. In addition,, in Figure 42, the burr P of the burr P specific surface Sa side of the back side Sb side of metallic plate is few.

As shown in the left hurdle of Figure 43, the in the situation that of condition B, on surface, (decorative cover) Sa side is formed with the groove V less than condition A, but Sb side does not have groove V overleaf. In the time that the gap of docking section is 2.00mm, form joint defect Q in the inside of metallic plate. The lines of plastification region W is that left and right is asymmetrical. The lines of the Ad side of plastification region W is darker than the lines of Re side. After the back side Sb of the condition A of the back side Sb of the condition B of Figure 43 and Figure 42 is contrasted, the burr P of condition B produces morely, and makes rough surface.

As shown in the left hurdle of Figure 44, the in the situation that of condition C, on surface, (decorative cover) Sa side is formed with less groove V, and Sb side is also formed with less groove V overleaf. In the time that the gap of docking section is 2.00mm, form joint defect Q in the inside of metallic plate. The upper and lower lines of plastification region W is roughly symmetrical, and the lines of left and right is roughly symmetrical. After the surperficial Sa of the condition B of the surperficial Sa of the condition C of Figure 44 and Figure 43 is contrasted, on the surperficial Sa of condition C, almost there is no burr. In addition,, on the Sb of the back side of condition C, the burr P of Re side produces manyly than the burr P of Ad side.

As shown in the left hurdle of Figure 45, the in the situation that of condition D, on surface, (decorative cover) Sa side does not form groove V, and Sb side forms less groove V overleaf. In the time that the gap of docking section is 2.00mm, form joint defect Q in the inside of metallic plate. In addition, the burr P of the burr P specific surface Sa of back side Sb produces manyly.

As shown in the left hurdle of Figure 46, the in the situation that of condition E, on surface, (decorative cover) Sa side does not form groove V, and Sb side forms very large groove V overleaf. In the time that the gap of docking section is 1.75mm, 2.00mm, form joint defect Q in the inside of metallic plate. Plastification region W narrows gradually towards back side Sb. Sb produces many burr P overleaf, does not produce burr P at surperficial Sa.

Figure 47 is the table after the result of embodiment 3 is gathered. The symbol of each key element is directly with reference to the symbol of embodiment 2. As shown in the schematic diagram of the condition A of Figure 47, if the left-hand thread towards right rotation is set in 100% scope, the metal of liquidation can be guided by helicla flute, and towards back side Sb side shifting. Because of the movement of above-mentioned metal, the second shaft shoulder portion 12 that makes twin shaft shoulder stir head dummy instrument 5 is pressed, and it is mobile towards a side (back side Sb side) contrary with sliding axle 4 with respect to metallic plate that twin shaft shoulder stirs head dummy instrument 5. By this, can enter too far into surface (decorative cover) Sa side because twin shaft shoulder stirs head dummy instrument 5, therefore, form very large groove V in surperficial Sa side.

On the other hand, as shown in condition B～E of Figure 47, in the case of being set, the right-hand thread part of 25% above ratio is used as the helicla flute 13a of top, the metal that the helicla flute of reason right-hand thread causes moves, will make twin shaft shoulder stir head dummy instrument 5 and be pressed towards sliding axle 4 sides (top), thereby can prevent that twin shaft shoulder stirring head dummy instrument from entering too far into the surperficial Sa (decorative cover) of metallic plate. By this, can prevent from producing groove V at surperficial Sa (decorative cover), even if or be formed with groove and also can reduce the degree of depth of groove. Therefore, can reduce for the metal sheet surface Sa after making to engage level and smooth fine finishining processing consuming time. But, in the time that the gap of docking section in condition B, condition C is 2.00mm, and in the time that the gap of docking section in condition D, condition E is 1.75mm or 2.00mm, owing to having produced joint defect Q, be therefore not suitable for. If can this is presumably because the cause that the gap of docking section will cause greatly the metal material of bonding part to reduce.

In addition, for example, as condition E, in the time that ratio with 100% is carved the right-hand thread of establishing towards right rotation, twin shaft shoulder stirs head dummy instrument 5 and moves towards top with respect to tabular end 102, the height and position of the lower surface of the first shaft shoulder portion 11 is positioned at the top of surface (decorative cover) Sa of tabular end 102 before friction is stirred, in the height and position of the lower surface of the first shaft shoulder portion 11 and tabular end 102 in the case of the gap between the surperficial Sa before friction is stirred is larger, pressing of metal is just abundant not, but in the height and position of the lower surface of the first shaft shoulder portion 11 and tabular end 102 in the case of the gap between the surperficial Sa before friction is stirred is small, can press fully metal.

In addition, in the height and position of the lower surface of the first shaft shoulder portion 11 and tabular end 102, in the case of the gap between the surperficial Sa before friction is stirred is small, the surperficial Sa before plastification region W only stirs than friction is outstanding a little. But, the surperficial Sa of tabular end 102 is become to level and smooth processing because the height of the surperficial Sa before only need to stirring with friction align and by outstanding part cutting, therefore, it is easy that fine finishining processing becomes.

In above-mentioned embodiment 2, top helicla flute 13a and lower part helical groove 13b form with the ratio of 50:50 with respect to the distance Z between shaft shoulder portion, but decorative cover is being made as to surperficial Sa, and make twin shaft shoulder stir head dummy instrument 5 in the situation of right rotation, comparatively it is desirable to, the top helicla flute 13a of right-hand thread of the first shaft shoulder portion 11 sides and the lower part helical groove 13b of the left-hand thread of the second shaft shoulder portion 12 sides are formed with the ratio of 25:75～100:0 with respect to the distance Z between shaft shoulder portion. That is to say, also the top helicla flute 13a of right-hand thread can be formed as in the first shaft shoulder portion 11 sides with respect to the Z-shaped part becoming more than 25% of the distance between shaft shoulder portion, and part beyond the helicla flute 13a of top is all as the lower part helical groove 13b of left-hand thread. In the situation that making twin shaft shoulder stir head dummy instrument 5 towards right rotation, left-hand thread also can be set, and in the axial total length of threaded 13, right-hand thread be set.

In addition,, in embodiment 3, though surperficial Sa side is set as to decorative cover, also back side Sb side can be set as to decorative cover. In this case, with reference to Figure 47, set according to condition A, B, C, D by the direction of rotation, the spiral fluted coiling direction that twin shaft shoulder are stirred to head dummy instrument 5, by this, can prevent that back side Sb (decorative cover) side from producing groove V, even if or be formed with groove V and also can reduce the degree of depth of groove V.

That is to say, rear side Sb is set as, decorative cover, comparatively it is desirable in right rotation in the case of making twin shaft shoulder stir head dummy instrument 5, comprising: docking operation, in this docking operation, docks the end face of metallic plate each other, and bonding process, in this bonding process, making, the second shaft shoulder portion 12 is relative with the decorative cover of metallic plate, and after the axial centre of threaded 13 and the thickness of slab direction center of metallic plate are aimed at, make the threaded 13 that stirs head dummy instrument 5 towards the twin shaft shoulder of right rotation move to docking section N, rub to stir and engage, distance Z between shaft shoulder portion is set as below the thickness of slab of metallic plate, and form the helicla flute of left-hand threads in the second shaft shoulder portion 12 sides of the outer peripheral face of threaded 13, and the helicla flute of above-mentioned left-hand thread is formed with more than 25% ratio with respect to the distance Z between shaft shoulder portion.

According to above-mentioned joint method, the left-hand thread of the second shaft shoulder portion 12 sides forms with more than 25% ratio, therefore, the metal that the helicla flute of reason left-hand thread causes moves, just can make twin shaft shoulder stir head dummy instrument 5 and press towards a side contrary to sliding axle 4 (below), thereby can prevent that twin shaft shoulder stirring head dummy instrument 5 from entering too far into the back side (decorative cover) Sb of metallic plate. By this, can prevent from producing groove at decorative cover, even if or be formed with groove and also can reduce the degree of depth of groove.

Figure 48 is the figure after the situation while making twin shaft shoulder stir head dummy instrument towards anticlockwise gathers.

In condition F, the ratio of the lower part helical groove 13b of the top helicla flute 13a of left-hand thread and right-hand thread is set as to 0:100 (there is no left-hand thread).

In condition G, the ratio of the lower part helical groove 13b of the top helicla flute 13a of left-hand thread and right-hand thread is set as to 25:75.

In condition H, the ratio of the lower part helical groove 13b of the top helicla flute 13a of left-hand thread and right-hand thread is set as to 50:50.

In condition I, the ratio of the lower part helical groove 13b of the top helicla flute 13a of left-hand thread and right-hand thread is set as to 75:25.

In condition J, the ratio of the lower part helical groove 13b of the top helicla flute 13a of left-hand thread and right-hand thread is set as to 100:0 (there is no right-hand thread).

As shown in Embodiment 3, when towards anticlockwise, use at top helicla flute 13a and be provided with left-hand thread, be provided with at lower part helical groove 13b the twin shaft shoulder stirring head dummy instrument 5A of right-hand thread. In the time making twin shaft shoulder stir head dummy instrument 5A towards anticlockwise, because to stir the coiling direction of screw thread of head dummy instrument 5 different from the twin shaft shoulder of embodiment 2, therefore, in result, can show the action effect identical with embodiment 3. That is to say, as shown in condition G～condition J, because the metal that friction is stirred after liquidation can be by after the top helicla flute 13a of the left-hand thread of threaded 13 guiding, towards the first shaft shoulder portion 11 side shiftings, and by after the top helicla flute 13b of the right-hand thread of threaded 13 guiding, towards the second shaft shoulder portion 12 side shiftings. Because left-hand thread forms with more than 25% ratio, therefore, the metal that the helicla flute of reason left-hand thread causes moves, make twin shaft shoulder stir head dummy instrument 5A and pressed towards sliding axle 4 sides (top), thereby can prevent that twin shaft shoulder stirring head dummy instrument 5A from entering too far into surface (decorative cover) Sa of metallic plate. By this, can prevent from producing groove V at surface (decorative cover) Sa, even if or be formed with groove V and also can reduce the degree of depth of groove V. By this, can reduce for the surperficial Sa of metallic plate after making to engage and become the consuming time of level and smooth fine finishining processing.

In addition, for example, as condition J, in the time that ratio with 100% is carved the left-hand thread of establishing towards anticlockwise, twin shaft shoulder stirs head dummy instrument 5 and moves towards top with respect to tabular end 102, and the height and position that makes the lower surface of the first shaft shoulder portion 11 is positioned at tabular end 102 above the surperficial Sa rubbing before stirring, in the height and position of the lower surface of the first shaft shoulder portion 11 and tabular end 102 in the case of the gap between the surperficial Sa before friction is stirred is larger, pressing of metal just can be abundant not, but in the height and position of the lower surface of the first shaft shoulder portion 11 and tabular end 102 in the case of the gap between the surperficial Sa before friction is stirred is small, just can press metal fully.

In the height and position of the lower surface of the first shaft shoulder portion 11 and tabular end 102, in the case of the gap between the surperficial Sa before friction is stirred is small, the surperficial Sa before plastification region W only stirs than friction is outstanding a little. But, the surperficial Sa of tabular end 102 is become to level and smooth processing because the height of the surperficial Sa before only need to stirring with friction align and by outstanding part cutting, therefore, it is easy that fine finishining processing becomes.

In above-mentioned embodiment 3, top helicla flute 13a and lower part helical groove 13b form with the ratio of 50:50 with respect to the distance Z between shaft shoulder portion, but decorative cover is being made as to surperficial Sa, and make twin shaft shoulder stir head dummy instrument 5 in the situation of anticlockwise, comparatively it is desirable to, the lower part helical groove 13b of the top helicla flute 13a of the left-hand thread of the first shaft shoulder portion 11 sides and the right-hand thread of the second shaft shoulder portion 12 sides forms with the ratio of 25:75～100:0 with respect to the distance Z between shaft shoulder portion. That is to say, also left-hand thread top helicla flute 13a can be formed as in the first shaft shoulder portion 11 sides, with respect to the Z-shaped part becoming more than 25% of the distance between shaft shoulder portion, and make part beyond the helicla flute 13a of top all as the lower part helical groove 13b of right-hand thread. In the situation that making twin shaft shoulder stir head dummy instrument 5 towards anticlockwise, right-hand thread also can be set, in the axial whole total length of threaded 13, left-hand thread is set.

In addition, although surperficial Sa side is set as to decorative cover, also back side S side can be set as to decorative cover. In this case, with reference to Figure 48, by twin shaft shoulder being stirred to direction of rotation, the spiral fluted coiling direction of head dummy instrument 5, according to condition F, G, H, I set, by this, can prevent that overleaf Sb (decorative cover) side produces groove V, even if or be formed with groove V and also can reduce the degree of depth of groove V.

That is to say, in the situation that making twin shaft shoulder stirring head dummy instrument 5 be set as decorative cover towards anticlockwise and by back side Sb side, comparatively it is desirable to, comprising: docking operation, in this docking operation, docks the end face of metallic plate each other, and bonding process, in this bonding process, making, the second shaft shoulder portion 12 is relative with the decorative cover of metallic plate, and after the axial centre of threaded 13 is aimed at the thickness of slab direction center of metallic plate, make the threaded 13 that stirs head dummy instrument 5A towards the twin shaft shoulder of anticlockwise move to docking section N, rub to stir and engage, distance Z between shaft shoulder portion is set as below the thickness of slab of metallic plate, and form the helicla flute of right-hand threads in the second shaft shoulder portion 12 sides of the outer peripheral face of threaded 13, and the helicla flute of above-mentioned right-hand thread is formed with more than 25% ratio with respect to the distance Z between shaft shoulder portion.

According to above joint method, the right-hand thread of the second shaft shoulder portion 12 sides forms with more than 25% ratio, therefore, the metal that the helicla flute of reason right-hand thread causes moves, make twin shaft shoulder stir head dummy instrument 5A and pressed with the opposition side (below) of sliding axle 4 by court, thereby can prevent that twin shaft shoulder stirring head dummy instrument 5A from entering too far into the back side (decorative cover) Sb of metallic plate. Forming groove by this, can prevent that overleaf (decorative cover) produces groove, even if or also can reduce the degree of depth of groove.

Then, embodiments of the invention 4 are described. Figure 49 is the front view that represents engaging form or the docking form of embodiment 4, and wherein, Figure 49 (a) represents type i, and Figure 49 (b) represents Type II, and Figure 49 (c) represents type-iii. In embodiment 4, prepare three kinds of bodies to be tested, only the part of type i, Type II and type-iii being rubbed respectively to stir engages, and angular deformation separately after engaging is investigated.

Type i～III is the double face slab 201A being made up of aluminium alloy 6N01-T5 material, 201B, with reference to Figure 20 and Figure 49, set for and make outside plate heavy section (the first outside plate heavy section 211, the second outside plate heavy section 221) thickness of slab a=3mm, covering part (covering part 213, 223, 232, 242) thickness b=0.5mm, from the length c of support plate 204 to first end faces 33 and from the length c=15mm of support plate 204 to second end faces 43, length d=30mm from the upper surface of outside plate 202 to the lower surface of inner panel 203, left and right width dimensions e=200mm, extend and be of a size of 5000mm.

With reference to Figure 23, twin shaft shoulder stirs head dummy instrument 265 sets diameter β 2=10mm, the diameter β 1=15mm of the second shaft shoulder portion 253, the external diameter U=6mm of threaded 254 of the upper surface 253c of the diameter α 2=10mm of the lower surface 252c that makes the first shaft shoulder portion 252, the second shaft shoulder portion 253 for. Be set as 2.9mm from the length (length of the exposed portions serve of threaded 254) of the first 252 to second shaft shoulder portions 253 of shaft shoulder portion. The shape that is formed at the depressed part (not shown) of the lower surface 252c of the first shaft shoulder portion 252 is vortex shape from overlooking to observe, and the degree of depth of depressed part is set as 0.3mm, and the spacing setting of depressed part is 1.2mm. Twin shaft shoulder stirs head dummy instrument 265 and sets for towards right rotation, and type i～III all moves towards rear side from the paper outside of Figure 49 (a)～Figure 49 (c). The speed setting that twin shaft shoulder stirs head dummy instrument 265 is 2000rpm, and translational speed is set as 1000mm/min.

In type i, as shown in Figure 49 (a), stir the left side configuration double face slab 201A of the direct of travel of head dummy instrument 265 at twin shaft shoulder, at right side configuration double face slab 201B, and the first hook portion 212A is engaged with the second hook portion 222B.

In Type II, as shown in Figure 49 (b), stir the right side configuration double face slab 201A of the direct of travel of head dummy instrument 265 at twin shaft shoulder, at left side configuration double face slab 201B, and the first hook portion 212A is engaged with the second hook portion 222B.

In type-iii, as shown in Figure 49 (c), stir the left side configuration double face slab 201A of the direct of travel of head dummy instrument 265 at twin shaft shoulder, at right side configuration double face slab 201B, and the first end face 233A is docked with the second end face 243B.

Figure 50 is the figure that represents the angular deformation result of type i. Figure 51 is the figure that represents the angular deformation result of Type II. Figure 52 is the figure that represents the angular deformation result of type-iii. Transverse axis represents the length on width of engaged each body to be tested apart from left-hand end. Width=200mm is the position that represents center line C1. The longitudinal axis represent each body to be tested apart from datum mark arbitrarily, engage after height. The height everywhere that is 50mm, 200mm, 400mm, 600mm, 800mm, 950mm to the distance apart from front end towards bearing of trend of each body to be tested calculates.

As shown in Figure 50,51, in type i, Type II, the highest at the height of the position of width=180mm, minimum at the height of the position of width=210mm. That is to say, bonding part forms slight concave shape. In addition,, on the difference of height of the position of width=180mm～210mm, Type II is larger than type i. In addition, from the position of width=210mm to the difference of height of the right-hand member of body to be tested, Type II is also large than type i. That is to say, can know that the angular deformation of Type II is larger than the angular deformation of type i on the whole.

Can this is presumably because as shown in Figure 49 (a) and Figure 49 (b), double face slab 201A, 201B are subject to twin shaft shoulder and stir the difference caused of the force direction of head dummy instrument 265 and the engaging form of double face slab 201A, 201B. Can expect stirring head dummy instrument 265 (helicla flute 255 of threaded 254 is left-hand thread) towards right rotation at the twin shaft shoulder that makes present embodiment, and while moving toward rear side from the paper outside of Figure 49, effect has stress F1.

Therefore, if the Type II shown in Figure 49 (b), due to the incline direction of inclined plane Ma and the action direction almost parallel of stress F1 of holding section M, and stress F1 is positioned at the same side with respect to input position and the inclined plane Ma of center line C1, therefore, easily towards the right side, tiltedly below is mobile for double face slab 201B, thereby the possibility that in joint, double face slab 201A, 201B divide out is improved.

On the other hand, if the type i shown in Figure 49 (a), because the incline direction of the inclined plane Ma of holding section M is crossing with the action direction of stress F1, and stress F1 is positioned at opposition side with respect to input position and the inclined plane Ma of center line C1, therefore, can effectively prevent that in joint, double face slab 201A, 201B divide out.

In addition, as shown in Figure 52, in type-iii, the position that is 180mm at width is roughly the same with the height of the position that is 210mm at width. That is to say, compared with the end of left and right, bonding part is the highest, observes and is mountain type from front. In addition, the difference of height of type-iii is also large than the difference of height of type i, II. Suppose configuration polylith (for example five) double face slab, and start friction stirring joint from docking section N side as type-iii, can think that the angular deformation amount of the double face slab entirety after engaging can increase. Therefore, from the viewpoint of bond strength, it is all no problem no matter first which in holding section M and docking section N to be engaged, if but consider angular deformation amount, comparatively it is desirable to, first rub and stir joint from holding section M side.

Figure 53 is the table after the direction of rotation of twin shaft shoulder stirring head dummy instrument, spiral fluted coiling direction, engaging form are gathered. In Figure 53, show the optimum condition 1～4 of Four types. As condition 1 (with present embodiment with) as shown in, be that the twin shaft shoulder of left-hand thread stirs head dummy instrument 265 towards right rotation making helicla flute, and situation about moving towards rear side from the paper outside of Figure 53, the preferred Selective type I of engaging form.

That is to say, in condition 1, owing to making twin shaft shoulder stir head dummy instrument 265 towards right rotation, therefore, effect have with respect to center line C1 from left side the component towards the direction on right side, and the metal of plastification after flowing can guide by helicla flute, and move down from upper. Therefore,, in condition 1, as engaged shown in form, effect has stress F1. Thereby in type i, by the inclined plane Ma of the second hook portion 212B and holding section M is set in the mode relative with stress F1, thereby double face slab 201A, 201B divide out in preventing from engaging.

In addition, as shown in condition 2, be that the twin shaft shoulder of right-hand thread stirs head dummy instrument 265 towards anticlockwise making helicla flute, and situation about moving towards rear side from the paper outside of Figure 53, the preferred Selective type II of engaging form.

That is to say, in condition 2, owing to making twin shaft shoulder stir head dummy instrument 265 towards anticlockwise, therefore, effect have with respect to center line C1 from right side the component towards the direction in left side, and the metal of plastification after flowing can guide by helicla flute, and move down from upper. Therefore,, in condition 2, as engaged shown in form, effect has stress F2. Thereby in Type II, by the inclined plane Ma of the second hook portion 212B and holding section M is set in the mode relative with stress F2, thereby double face slab 201A, 201B divide out in preventing from engaging.

Similarly, as shown in condition 3, be that the twin shaft shoulder of right-hand thread stirs head dummy instrument 265 towards right rotation making helicla flute, and situation about moving towards rear side from the paper outside of Figure 53, the preferred Selective type IV of engaging form.

Similarly, as shown in condition 4, be that the twin shaft shoulder of left-hand thread stirs head dummy instrument 265 towards anticlockwise making helicla flute, and situation about moving towards rear side from the paper outside of Figure 53, the preferred Selective type V of engaging form.

Even the in the situation that of condition 3, condition 4, by inclined plane Ma ' and the second hook portion 212B ' of snap-latch surface M are set in the mode relative with stress F3, F4, thereby double face slab 201A ', 201B ' are separately in preventing from engaging.

In addition, in condition 1, condition 2, comparatively it is desirable to, in the first shaft shoulder portion 252 sides, covering part is set, in condition 3,4, comparatively it is desirable to, in the second shaft shoulder portion 253 sides, covering part is set. By this, metal can be added to because of friction and stir a side that makes metal deficiency, therefore, can supplement metal deficiency.

At embodiment 5, rubbing to stir with the double face slab of embodiment 4 different sizes with five engages. If with reference to Figure 20, the double face slab of embodiment 5 is set for and is made thickness of slab a=4.0mm, thickness b=0.5mm, the left and right width dimensions e=400mm of covering part, the prolongation of outside heavy section be of a size of 12500mm.

If with reference to Figure 23, twin shaft shoulder stirs diameter β 2=15mm, the external diameter U=9mm of threaded 254 of the upper surface 253c of diameter β 1=18mm, second shaft shoulder portion 253 of diameter α 2=15mm that head dummy tool settings becomes to make the lower surface 252c of the first shaft shoulder portion 252, the second shaft shoulder portion 253. Be set as 3.7mm from the length (length of the exposed portions serve of threaded 254) of the first 252 to second shaft shoulder portions 253 of shaft shoulder portion. In addition, the rotary speed of twin shaft shoulder stirring head dummy instrument is set as to 1000rpm. In addition it is 1000mm/min that the translational speed that, twin shaft shoulder is stirred to head dummy instrument is set in holding section M side, be 1500mm/min in docking section N side.

In embodiment 5, a side double face slab is placed on to desktop, the opposing party's double face slab is put down from top, engage and dock. After five double face slabs seamlessly being engaged by identical operation, fixing assembly can not move freely it. And use the horizontal pressing tongs on extending direction with 1.5m arranged spaced to press, so that assembly can not float. In addition, four corners of assembly are clamped simply. Then, start from one end to rub successively stir engage.

Even under the condition of embodiment 5, also can produce and not engage bad face component. At this, in general, in the time that stirring that hardware is rubbed engages, sometimes because thermal contraction makes the hardware generation warpage after joint. Suppose to rub and stir joint at surface, the back side of hardware, at rotary speed, translational speed and the movable length of the throw with the same terms, the surface of hardware is rubbed and stirred after joint, rear side is rubbed to stir to be engaged, and the rear side of hardware may warpage become concavity.

This is, after stirring owing to rubbing in effects on surface side and engaging, to form concavity because thermal contraction meeting makes hardware in face side, therefore, hardware is turned over while being placed on smooth desktop, just can make the gap between desktop and hardware become greatly. In this state, engage if rear side is rubbed to stir, be not easy to dissipate to desktop just stir by friction the heat producing, therefore, heat residual on hardware is increased. Consequently, owing to residuing in the hot acting in conjunction of hardware, make rear side significantly warpage become concavity.

Therefore, as long as embodiment 5, the twin shaft shoulder of docking section N side is stirred to head dummy instrument and move degree of hastening and set that to move degree of hastening than the twin shaft shoulder stirring head dummy instrument of holding section M fast for, just can prevent from engaging time, enter the heat of docking section. By this, can prevent the double face slab warpage after joint.

In embodiment 6, for the relation between thickness of slab and length to tabular end is investigated and tested. As shown in Figure 54 (a), two cross sections are to body to be tested 401,301 docking of the same shape of コ word shape, and docking section N is rubbed and stirs joint. Each body to be tested 401 comprises supporting member 402, vertically extends the tabular end 403 of setting from supporting member.

The height setting of body 401 to be tested is 30mm, extends size and is set as 500mm. As shown in Figure 54 (a), Figure 54 (b), using the length c of the thickness of slab a of tabular end 403 and the front end from supporting member 402 to tabular end 403 as parameter, under each condition, rubbing to stir engages. In Figure 54 (b), each condition and the bond quality of embodiment 6 are aggregated into table. Twin shaft shoulder stirs the size of head dummy instrument as shown in the table of Figure 54 (b).

As shown in Figure 54 (b), in the time of the length c=50mm of thickness of slab a=3mm, front end from supporting member 402 to tabular end 403, can produce engage bad. In addition, the in the situation that of thickness of slab a=6mm, when length c=70mm, 80mm can produce engage bad. The in the situation that of thickness of slab a=12mm, in the time of length c=120mm, can produce joint bad. That is to say, if the length of tabular end 403 is long with respect to supporting member 402, the front of tabular end 403 is easily out of shape, and therefore easily causes engaging bad.

Figure 55 is the figure that represents the dependency relation of embodiment 6. The transverse axis of Figure 55 represents thickness of slab a, and the longitudinal axis represents the length c of the front end from supporting member 402 to tabular end 403. From this figure, comparatively it is desirable to, the length c from supporting member to front end is set for to the condition that meets c≤7.0 × thickness of slab a+18.5. As long as under this condition, just can suppress the distortion of tabular end 403, therefore, be not easy to produce joint bad.

(symbol description)

1 friction agitating device

1a chuck portion

2 throw unit

3 keepers

4 sliding axles

5 twin shaft shoulders stir head dummy instrument

11 first shaft shoulder portions

12 second shaft shoulder portions

13a top helicla flute

13b lower part helical groove

100A hollow material

100B hollow material

N docking section

The thickness of T metallic plate

W plastification region (junction surface)

Distance between Z axis shoulder

Claims

1. a throw unit, the chuck portion of being fixed on friction agitating device, is characterized in that,Have:

The keeper of tubular, the keeper of this tubular is fixed on described chuck portion;

Sliding axle, this sliding axle can be inserted into the inside of described keeper; And

Twin shaft shoulder stirs head dummy instrument, and this twin shaft shoulder stirs head dummy instrument and is arranged on described sliding axleFront end,

Described keeper has a pair of slotted hole, and this pair of slotted hole radially connects and toward each other,

Described sliding axle has: alignment pin, and this alignment pin can be inserted in described a pair of slotted hole; AndFixed component, described alignment pin is fixed on described sliding axle by this fixed component,

Described twin shaft shoulder stirs head dummy instrument to be had: the first shaft shoulder portion, this first shaft shoulder portion is fixed onDescribed sliding axle; The second shaft shoulder portion, this second shaft shoulder portion and described the first shaft shoulder portion separate; And spiral shellLine pin, this threaded links described the first shaft shoulder portion and described the second shaft shoulder portion,

Described slotted hole is along extending axially setting,

By engaging of described slotted hole and described alignment pin, make described sliding axle and described keeper oneThe rotation of body ground, and move vertically in the scope of described slotted hole.

2. throw as claimed in claim 1 unit, is characterized in that,

Described sliding axle has: through hole, and this through hole connects vertically; And pin-and-hole, this pin-and-hole and instituteState through hole orthogonal, in described pin-and-hole, insert described alignment pin,

In described through hole, insert described fixed component, the front end of described fixed component and described alignment pinButt.

3. throw as claimed in claim 1 unit, is characterized in that,

Be formed with the eel-like figure portion thinner than other parts at the central portion of described alignment pin,

The front end of described fixed component and described eel-like figure portion butt.

4. throw as claimed in claim 1 unit, is characterized in that,

Described twin shaft shoulder stirs head dummy instrument to be had: the first securing member, and described in this first securing member is incited somebody to actionOne distolateral and described the first shaft shoulder portion of threaded is fastening; And second securing member, this second securing memberBy fastening another distolateral and described second shaft shoulder portion of described threaded,

Be formed with extension setting vertically and cross section in the inside of described the first shaft shoulder portion and be non-circularThe first connecting hole,

Be formed with extension setting vertically and cross section in the inside of described the second shaft shoulder portion and be non-circularThe second connecting hole,

Described threaded has:

Spiral slot part, this spiral slot part exposes between described the first shaft shoulder portion and described the second shaft shoulder portion;

The first engaging axial region, this first engaging axial region is formed on one distolateral, and with described the first connecting holeEngaging; And

The second engaging axial region, this second engaging axial region is formed on that another is distolateral, and engages with described secondHole engaging.

5. throw as claimed in claim 1 unit, is characterized in that,

Be formed with in the inside of described the first shaft shoulder portion vertically and extend the first hole of arranging and from described axleThe first screw engaging elongated hole that the side of shoulder is communicated with described the first hole,

Be formed with in the inside of described the second shaft shoulder portion vertically and extend the second hole of arranging and from described axleThe second screw engaging elongated hole that the side of shoulder is communicated with described the second hole,

Described threaded has:

The first axle part, it is one distolateral that this first axle part is formed on, and be inserted in described the first hole;

The first par, this first par is formed flatly on the outer peripheral face of described the first axle part;

The second axle part, this second axle part is formed on that another is distolateral, and is inserted in described the second hole;And

The second par, this second par is formed flatly on the outer peripheral face of described the second axle part,

The first engaging screw is screwed into described the first screw engaging from the side of described the first shaft shoulder portion to be prolongedStretch in hole, make front end and the described first par butt of described the first engaging screw,

The second engaging screw is screwed into described the second screw engaging from the side of described the second shaft shoulder portion to be prolongedStretch in hole, make front end and the described second par butt of described the second engaging screw.

6. throw as claimed in claim 1 unit, is characterized in that,

At least one party in the lower surface of described the first shaft shoulder portion and the upper surface of described the second shaft shoulder portionOn be formed with groove, this groove stirs the axle landform in the shape of a spiral of head dummy instrument around described twin shaft shoulderBecome.

7. a friction stirring connecting method, right to use requires the throw unit described in 1, comesPair of metal plate is engaged, it is characterized in that, described friction stirring connecting method has:

Docking operation, in this docking operation, docks the end face of described metallic plate each other; And

Bonding process, in this bonding process, makes the described twin shaft shoulder of rotation stir head dummy instrumentThreaded moves to the docking section of described end face being docked each other to rear formation, and described end face is entered each otherRow friction is stirred and is engaged,

In described bonding process, in advance the distance between the first shaft shoulder portion and the second shaft shoulder portion is set asBelow the thickness of described metallic plate, make described metallic plate distortion when stirring because of friction, make described goldWhen head dummy instrument axially displaced stirred along described twin shaft shoulder in the position that belongs to plate, described twin shaft shoulder stirsMixing head dummy instrument moves vertically along with the displacement of described metallic plate.

8. friction stirring connecting method as claimed in claim 7, is characterized in that,

In the time that described end face gap is to each other set as below 1.00mm,

Distance between the thickness of described metallic plate and described shaft shoulder portion is set for and met 0.2mm≤{ (goldBelong to the thickness of plate)-(distance between shaft shoulder portion) }≤0.8mm.

9. friction stirring connecting method as claimed in claim 7, is characterized in that,

Described end face gap being to each other set as being greater than 1.00mm and for below 1.75mm time,

Distance between the thickness of described metallic plate and described shaft shoulder portion is set for and met 0.4mm≤{ (goldBelong to the thickness of plate)-(distance between shaft shoulder portion) }≤0.8mm.

10. friction stirring connecting method as claimed in claim 7, is characterized in that,

In described bonding process, the situation that the thickness of the described metallic plate of the part after docking is differentUnder, when by described the metallic plate larger thickness of described metallic plate with respect to described twin shaft shoulder stirring-headWhen the direct of travel of type instrument is configured in left side, make described twin shaft shoulder stir head dummy instrument towards right rotation.

11. friction stirring connecting methods as claimed in claim 7, is characterized in that,

In described bonding process, the situation that the thickness of the described metallic plate of the part after docking is differentUnder, when by described the metallic plate larger thickness of described metallic plate with respect to described twin shaft shoulder stirring-headWhen the direct of travel of type instrument is configured in right side, make described twin shaft shoulder stir head dummy instrument towards anticlockwise.

12. friction stirring connecting methods as claimed in claim 7, is characterized in that,

In described bonding process,

Making, described the first shaft shoulder portion is relative with the decorative cover of described metallic plate, and makes described threadedAfter axial centre is aimed at the center of the thickness of slab direction of described metallic plate, make to observe from described sliding axle sideFor the threaded that stirs head dummy instrument towards the described twin shaft shoulder of right rotation moves to by described end face each otherThe docking section forming after docking,

Be formed with the helicla flute of right-hand thread in described first shaft shoulder portion side of the outer peripheral face of described threaded,The helicla flute of described right-hand thread with respect to the distance between described the first shaft shoulder portion and described the second shaft shoulder portion withMore than 25% ratio forms.

13. friction stirring connecting methods as claimed in claim 12, is characterized in that,

In described outer peripheral face, from the spiral fluted end of described right-hand thread to described the second shaft shoulder portionBetween, be formed with the helicla flute of left-hand thread.

14. friction stirring connecting methods as claimed in claim 7, is characterized in that,

In described bonding process,

Making, described the first shaft shoulder portion is relative with the decorative cover of described metallic plate, and makes described threadedAfter axial centre is aimed at the center of the thickness of slab direction of described metallic plate, make to observe from described sliding axle sideFor the threaded that stirs head dummy instrument towards the described twin shaft shoulder of anticlockwise moves to by described end face each otherThe docking section forming after docking,

Be formed with the helicla flute of left-hand thread in described first shaft shoulder portion side of the outer peripheral face of described threaded,The helicla flute of described left-hand thread forms with more than 25% ratio with respect to the distance between described shaft shoulder portion.

15. friction stirring connecting methods as claimed in claim 14, is characterized in that,

In described outer peripheral face, from the spiral fluted end of described left-hand thread to described the second shaft shoulder portionBetween, be formed with the helicla flute of right-hand thread.

16. friction stirring connecting methods as claimed in claim 7, is characterized in that,

In described bonding process,

Making, described the second shaft shoulder portion is relative with the decorative cover of described metallic plate, and makes described threadedAfter axial centre is aimed at the center of the thickness of slab direction of described metallic plate, make to observe from described sliding axle sideFor the threaded that stirs head dummy instrument towards the described twin shaft shoulder of right rotation moves to by described end face each otherThe docking section forming after docking,

Be formed with the helicla flute of left-hand thread in described second shaft shoulder portion side of the outer peripheral face of described threaded,The helicla flute of described left-hand thread forms with more than 25% ratio with respect to the distance between described shaft shoulder portion.

17. friction stirring connecting methods as claimed in claim 16, is characterized in that,

In described outer peripheral face, from the spiral fluted end of described left-hand thread to described the first shaft shoulder portionBetween, be formed with the helicla flute of right-hand thread.

18. friction stirring connecting methods as claimed in claim 7, is characterized in that,

In described bonding process,

Making, described the second shaft shoulder portion is relative with the decorative cover of described metallic plate, and makes described threadedAfter axial centre is aimed at the center of the thickness of slab direction of described metallic plate, make to observe from described sliding axle sideFor the threaded that stirs head dummy instrument towards the described twin shaft shoulder of anticlockwise moves to by described end face each otherThe docking section forming after docking,

Be formed with the helicla flute of right-hand thread in described second shaft shoulder portion side of the outer peripheral face of described threaded,The helicla flute of described right-hand thread forms with more than 25% ratio with respect to the distance between described shaft shoulder portion.

19. friction stirring connecting methods as claimed in claim 18, is characterized in that,

In described outer peripheral face, from the spiral fluted end of described right-hand thread to described the first shaft shoulder portionBetween, be formed with the helicla flute of left-hand thread.

20. friction stirring connecting methods as described in claim 12,14,16 or 18, its featureBe,

In described bonding process, connect the decorative cover of described metallic plate being carried out in coolingClose.

The assembly of 21. 1 kinds of double face slabs, it is that right to use requires the throw list described in 1Unit, to a pair of double face slab rub stir engage after form, it is characterized in that,

Make hook portion on the end of outside plate of the described double face slab that is formed on a side and be formed on the opposing partyThe end of outside plate of described double face slab on hook portion engaging,

By be formed on end face on a side the end of inner panel of described double face slab and the opposing party described inThe end face docking of the inner panel of double face slab, and do not engage.

The assembly of 22. double face slabs as claimed in claim 21, is characterized in that,

Each described hook portion has: thinner wall section, and this thinner wall section is extended and is arranged from the heavy section of described outside plate;And extension, this extension and described thinner wall section are continuous, and stretch out along thickness of slab direction,

A pair of described extension is engaged with each other.

The assembly of 23. double face slabs as claimed in claim 22, is characterized in that,

Be formed with and stretch out inclined plane at the sidepiece of the described extension of described double face slab of the side,

Be formed with the described inclined plane face that stretches out and connect at the described heavy section of the opposing party's described double face slabTactile heavy wall inclined plane.

The assembly of 24. double face slabs as claimed in claim 22, is characterized in that,

Between described outside plate and described inner panel, be folded with support plate,

Be c millimeter by the length setting from described support plate to described end face, and by described heavy sectionThickness of slab while being set as t millimeter mm,

Meet c≤7.0 × t+18.5.

The friction stirring connecting method of 25. 1 kinds of double face slabs, right to use requires the rotation described in 1Tool unit, the end of a pair of double face slab is rubbed to stir each other to be engaged, it is characterized in that,Comprise:

Preparatory process, in this preparatory process, will be formed on a side the outside plate of described double face slabHook portion on end and the hook portion card being formed on the opposing party's the end of outside plate of described double face slabClose, and will be formed on end face on a side the end of inner panel of described double face slab and the opposing partyThe end face docking of the inner panel of described double face slab, and do not engage; And

Bonding process, in this bonding process, in described preparatory process engaging after holding section andDocking section after docking rubs to stir and engages.

The friction stirring connecting method of 26. double face slabs as claimed in claim 25, is characterized in that,

In described bonding process, after described holding section is engaged, more described docking section is engaged.