CN103459081A

CN103459081A - Rotary tool unit, friction stir welding method, double-skin panel assembly, and friction stir welding method for double-skin panel assembly

Info

Publication number: CN103459081A
Application number: CN2011800650818A
Authority: CN
Inventors: J·马丁; 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: 2011-12-26
Publication date: 2013-12-18
Anticipated expiration: 2031-12-26
Also published as: CN103934565B; KR20140029390A; CN104002037A; KR101471320B1; JP5559214B2; JP2013027921A; TW201235138A; CN103459081B; CN104002037B; WO2012098810A1; TWI494185B; CN103934565A; CN103894727A; CN103894727B

Abstract

Provided is a welding method with which welding defects can be prevented and with which metal plates can be suitably welded together when a pair of metal plates is welded together using a bobbin tool. A rotary tool unit (2) has a bobbin tool (5) formed with a first shoulder (11), a second shoulder (12), and a pin (13) formed between the first shoulder (11) and the second shoulder (12), and is characterized by having: a cylindrical holder (3) affixed to a chuck part (1a) of a friction stir device (1); a slide shaft (4) that penetrates to the interior of the holder (3) and rotates integrally with the holder (3); the bobbin tool (5), the first shoulder (11) of which is affixed to the tip of the slide shaft (4); and a slide means (6) formed between the holder (3) and the slide shaft (4) such that the slide shaft (4) slides in the axial direction with respect to the holder (3).

Description

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

Technical field

The present invention relates to have the twin shaft shoulder stir head dummy instrument (Japanese: ボ PVC Application Star ー Le, bobbin tool) the 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 formed and the friction stirring connecting method that uses the double face slab of above-mentioned throw.

Background technology

In the past, known have the twin shaft shoulder to stir the head dummy instrument to be used as end face to metallic plate and rub each other and stir the instrument (with reference to patent documentation 1) of joint.The twin shaft shoulder stirs the pin that the head dummy kit is drawn together a pair of shaft shoulder section and formed between above-mentioned shaft shoulder section.When the pair of metal plate is engaged, fixedly make it not move metallic plate, stir the head dummy instrument at the twin shaft shoulder by High Rotation Speed and insert from an end of metallic plate, and pin is moved along docking section.By this, the metal of end face around separately just stirred and metallic plate is engaged with each other by friction.If use the twin shaft shoulder to stir the head dummy instrument, because the rear side at metallic plate also has shaft shoulder section, therefore, usually can omit the back of the body connection member (Japanese: Li is when section's material) of the rear side that is configured in metallic plate.Particularly, while being engaged with each other in the end by hollow material, because the operation that back of the body connection member is set is comparatively complicated, therefore, can significantly save operation procedure.

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

The 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

Yet, in joint is stirred in the friction of using the twin shaft shoulder to stir the head dummy instrument, comparatively it is desirable to, in the axial centre that makes pin, with the Centered of short transverse of metallic plate, engaged simultaneously, still, metallic plate can deform because of frictional heat sometimes.Once metallic plate deforms because of frictional heat, the Ze Xiao center just can't with the center-aligned of metallic plate, and cause engage bad.

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

In addition, the outer peripheral face that the twin shaft shoulder stirs the pin 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 formed on the decorative cover of the metallic plate after joint to become on large or decorative cover the such problem of many burr that produces.

In addition, because double face slab is thin and long hardware, therefore, the operation that the outside plate of a pair of double face slab is docked with inner panel accurately with outside plate, inner panel is comparatively difficult.In addition, even 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 be engaged.

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 be engaged ideally when using twin shaft shoulder stirring head dummy instrument to be engaged the pair of metal plate.In addition, its technical problem is can reduce the burr that produce on the decorative cover of metallic plate, or can dwindle the groove formed on decorative cover when the outer peripheral face that stirs the pin of head dummy instrument at the twin shaft shoulder is carved with helicla flute.In addition, technical problem of the present invention is to provide a kind of assembly of the double face slab that can ideally double face slab be engaged and the friction stirring connecting method of double face slab.

The technical scheme that the technical solution problem adopts

In order to solve the problems of the technologies described above, the present invention proposes a kind of throw unit, for rubbing, stirs and engages, and it is characterized in that having: keeper cylindraceous, and this keeper is fixed in the chuck section of friction agitating device; Sliding axle, this sliding axle can be inserted into the inside of above-mentioned keeper, and rotates integratedly with described keeper; And the twin shaft shoulder stirs the head dummy instrument, this twin shaft shoulder stirring head dummy instrument reaches by the first shaft shoulder section, the second shaft shoulder section pin formed between above-mentioned the first shaft shoulder section and above-mentioned the second shaft shoulder section and forms, front end at above-mentioned sliding axle is fixed with above-mentioned the first shaft shoulder section, comprise sliding members between above-mentioned keeper and above-mentioned sliding axle, thereby above-mentioned sliding axle is slided vertically with respect to above-mentioned keeper.

According to said structure, even metallic plate stirs direction warpage outside face because of friction, the twin shaft shoulder stirs the head dummy instrument and also can move vertically along with the distortion of metallic plate.By this, the displacement (skew) of junction can be prevented, therefore, bad generation can be suppressed to engage.

In addition, comparatively it is desirable to, above-mentioned sliding members consists of the bearing groove on the inner surface of the outer surface that is formed on above-mentioned sliding axle or above-mentioned keeper and the ball bearing that slides in bearing groove.

According to said structure, can form simply sliding members.

In addition, comparatively it is desirable to, have the key formed on the keyway that forms on any one party in above-mentioned keeper and above-mentioned sliding axle and the opposing party in above-mentioned keeper and above-mentioned sliding axle, above-mentioned key is accompanied by the movement of above-mentioned sliding axle and moves in the inside of above-mentioned keyway.

According to said structure, can keeper and sliding axle be rotated integratedly with simple structure, and can make sliding axle move in the scope of keyway.

In addition, comparatively it is desirable to, extending axially of any one party in the outer surface of the inner surface of above-mentioned keeper and above-mentioned sliding axle is provided with raised line, extending axially of the opposing party in the outer surface of the inner surface of above-mentioned keeper and above-mentioned sliding axle is provided with recessed, and above-mentioned raised line is accompanied by the movement of above-mentioned sliding axle and moves the inside of above-mentioned recessed.

According to said structure, can keeper and sliding axle be rotated integratedly with simple structure, and can make sliding axle move within a large range.

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, the pair of metal plate is engaged, it is characterized in that, above-mentioned friction stirring connecting method has: the docking operation, in this docking operation, docks the end face of above-mentioned metallic plate each other, and joint operation, at this, engage in operation, make the pin 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 joint operation, in advance the distance between the first shaft shoulder section and the second shaft shoulder section 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 the head dummy instrument and moves vertically along with the displacement of above-mentioned metallic plate.

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

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

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

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

In addition, comparatively it is desirable to, the value of the square value of setting the external diameter that makes above-mentioned shaft shoulder section for after divided by the square value of the external diameter of above-mentioned pin is greater than 2.0.

According to above-mentioned joint method, can with respect to the external diameter of pin, guarantee very greatly by the external diameter of shaft shoulder section, therefore, can to the metal of Plastic Flow between shaft shoulder section, be pressed reliably.By this, can further suppress the generation of joint defect.If the value of the square value of the external diameter of shaft shoulder section after divided by the square value of the external diameter of above-mentioned pin 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 external diameter of above-mentioned shaft shoulder section is deducted to the value obtained after the square value of external diameter of above-mentioned pin, and the value of the square value of external diameter that makes above-mentioned pin after divided by value obtained above be greater than 0.2, and make the value that the square value of the external diameter of above-mentioned pin is multiplied by after the value of stating the distance between shaft shoulder section divided by the external diameter of above-mentioned pin be greater than 1.2.

According to said method, if the square value of the external diameter of above-mentioned shaft shoulder section is deducted to the value obtained after the square value of external diameter of pin, and the value of the square value of external diameter that makes pin after divided by value obtained above is below 0.2, thinner because of pin, make the tensile resistence deficiency and cause easily fractureing, if but larger than 0.2, because of pin, relatively slightly be not easy to fracture.

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

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

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

In friction, stir in joint, when making throw towards right rotation, the metal of Plastic Flow has from the left side of the direct of travel of instrument (shear 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 the instrument direct of travel, therefore, can think that hypothesis is in the situation that there is gap to each other in metallic plate, the metal of shearing side can the above-mentioned gap of landfill.Therefore, if little metallic plate is configured in the shearing side by thickness, the trend of the central portion less thick in the not enough and plastification zone after making to engage of metal.

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

In addition, comparatively it is desirable to, in above-mentioned joint operation, making, above-mentioned the first shaft shoulder section is relative with the decorative cover of above-mentioned metallic plate, and the axial centre that makes above-mentioned pin is with after the center of the thickness of slab direction of above-mentioned metallic plate is aimed at, make from above-mentioned sliding axle side be viewed as the pin that stirs the 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 section side of the outer peripheral face of above-mentioned pin, the helicla flute of above-mentioned right-hand thread forms with the ratio more than 25% with respect to the distance between above-mentioned the first shaft shoulder section and above-mentioned the second shaft shoulder section.

According to above-mentioned joint method, the right-hand thread of the first shaft shoulder section side forms with the ratio more than 25%, therefore, the metal that the helicla flute of reason right-hand thread causes moves, make the twin shaft shoulder stir the head dummy instrument and pressed towards the sliding axle side, thereby can prevent that the twin shaft shoulder from stirring the decorative cover that the head dummy instrument enters too far into metallic plate.By this, can prevent from producing groove at decorative cover, even 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 section, 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 joint operation, making, above-mentioned the first shaft shoulder section is relative with the decorative cover of above-mentioned metallic plate, and the axial centre that makes above-mentioned pin is with after the center of the thickness of slab direction of above-mentioned metallic plate is aimed at, make from above-mentioned sliding axle side be viewed as the pin that stirs the 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 section side of the outer peripheral face of above-mentioned pin, the helicla flute of above-mentioned left-hand thread forms with the ratio more than 25% with respect to the distance between above-mentioned shaft shoulder section.

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

In addition, comparatively it is desirable to, in engaging operation, making, described the second shaft shoulder section is relative with the decorative cover of described metallic plate, and the axial centre that makes described pin is with after the center of the thickness of slab direction of described metallic plate is aimed at, make from described sliding axle side be viewed as the pin that stirs the 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 section side of the outer peripheral face of above-mentioned pin, the helicla flute of above-mentioned left-hand thread forms with the ratio more than 25% with respect to the distance between above-mentioned shaft shoulder section.

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

In addition, comparatively it is desirable to, in above-mentioned joint operation, making, above-mentioned the second shaft shoulder section is relative with the decorative cover of above-mentioned metallic plate, and the axial centre that makes above-mentioned pin is with after the center of the thickness of slab direction of above-mentioned metallic plate is aimed at, make from above-mentioned sliding axle side be viewed as the pin that stirs the 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 section side of the outer peripheral face of above-mentioned pin, the helicla flute of above-mentioned right-hand thread forms with the ratio more than 25% with respect to the distance between above-mentioned shaft shoulder section.

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

In addition, comparatively it is desirable to, in above-mentioned joint operation, carry out in cooling being engaged at the decorative cover to above-mentioned metallic plate.

According to above-mentioned joint method, the temperature of the metal by suppressing liquidation rises, and 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, a pair of double face slab is rubbed after stir engaging and to form, it is characterized in that, the hook portion that makes to be formed on the end of hook portion on a side the end of outside plate of above-mentioned double face slab and the outside plate of the above-mentioned double face slab that is formed on the opposing party engages, the end face be 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, by the hook portion that makes outside plate, engage with each other, in the time of just can preventing from engaging, double face slab be separated from each other.If at inner panel, hook portion also is set, the operation of double face slab docking each other will become difficult, therefore, in the present invention, at inner panel, hook portion is not set, only by end face is docked and gets final product each other.By this, can make the operation of the preparatory process of double face slab docking more laborsaving.

In addition, comparatively it is desirable to, each above-mentioned hook portion has: thinner wall section, and this thinner wall section is extended setting 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 the 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, at the sidepiece of the above-mentioned extension of above-mentioned double face slab of the side, be formed with and stretch out inclined plane, be formed with and above-mentioned heavy wall inclined plane of stretching out the 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 the thickness of slab of above-mentioned heavy section is set as to t(mm) time, meet c≤7.0 * t+18.5mm.

If the distance from the support plate to the 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, the hook portion be formed on the end of hook portion on a side the end of outside plate of above-mentioned double face slab and the outside plate of the above-mentioned double face slab that is formed on the opposing party is engaged, and the end face that will be formed on a side the end of inner panel of above-mentioned double face slab docks with the end face of the inner panel of the opposing party's above-mentioned double face slab, and do not engage, and the joint operation, at this, engaging in operation, 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, by the hook portion that makes outside plate, engage with each other, in the time of just can preventing from engaging, double face slab be separated from each other.If at inner panel, hook portion also is set, it is difficult that the operation meeting of double face slab docking each other becomes, and therefore, in the present invention, at inner panel, hook portion is not set, and only by the end face docking is got final product.By this, can make the operation of the preparatory process of double face slab docking more laborsaving.

In addition, comparatively it is desirable to, in above-mentioned joint operation, 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 metallic plate angular deformation each other after joint.

The invention effect

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

The accompanying drawing explanation

Fig. 1 means the friction agitating device of embodiment 1 and the stereogram of hollow material.

Fig. 2 means the mated condition of hollow material, wherein, and before Fig. 2 (a) means docking, after Fig. 2 (b) means docking.

Fig. 3 means the stereogram of the friction agitating device of embodiment 3, and wherein, Fig. 3 (a) means overall diagram, and Fig. 3 (b) means keeper, sliding axle and sliding members.

Fig. 4 is the I-I cutaway view of Fig. 3.

Fig. 5 is the II-II cutaway view of Fig. 3.

Fig. 6 means that the twin shaft shoulder of embodiment 1 stirs the side view of head dummy instrument.

Fig. 7 means the figure of the friction stirring connecting method of embodiment 1, and wherein, Fig. 7 (a) is sectional view, and Fig. 7 (b) is the III-III end view drawing of Fig. 7 (a).

Fig. 8 means that the twin shaft shoulder of embodiment 2 stirs the side view of head dummy instrument.

Fig. 9 means the sectional view of the friction stirring connecting method of embodiment 2.

Figure 10 (a) means the first variation of friction stirring connecting method, and Figure 10 (b) means the second variation of friction stirring connecting method.

Figure 11 means the figure of the throw unit of variation, and wherein, Figure 11 (a) is sectional view, and Figure 11 (b) is the IV-IV cutaway view of Figure 11 (a).

Figure 12 means the stereogram of the double face slab of embodiment 3.

Figure 13 means the stereogram of the friction agitating device of embodiment 3.

Figure 14 means the stereogram of the throw unit of embodiment 3.

Figure 15 means that the twin shaft shoulder of embodiment 3 stirs the side view of head dummy instrument.

Figure 16 means the front view of preparatory process of the friction stirring connecting method of embodiment 3.

Figure 17 means the first stereogram that engages operation of the friction stirring connecting method of embodiment 3.

Figure 18 means the second stereogram that engages operation of the friction stirring connecting method of embodiment 3.

Figure 19 means the front view of variation of the engaging form of embodiment 3.

Figure 20 means the table of the combination of the test body in embodiment 1.

Figure 21 means in embodiment 1, the figure of the relation between the gap of test body H1 and the thickness at junction surface.

Figure 22 means in embodiment 1, the figure of the relation between the gap of test body H3 and the thickness at junction surface.

Figure 23 means in embodiment 1, affects the thickness of metallic plate of bond quality and the table of the relation between gap, and it shows the situation of the thickness of the thickness of Ad side=Re side.

Figure 24 means the plate thickness that affects bond quality and the table of the relation between gap, its show the varied in thickness that makes the Ad side and by the thickness of Re side fixing situation.

Figure 25 means the plate thickness that affects bond quality and the table of the relation between gap, and it shows fixes the thickness of Ad side and makes the situation of the varied in thickness of Re side.

Figure 26 (a) means in embodiment 1, the table of the relation between the thickness of gap and Cr section, and Figure 26 (b) means in embodiment 1, the table of the relation between the thickness of gap and Ad section.

Figure 27 (a) means in embodiment 1, the table of the relation between the thickness of gap and Re section, and Figure 27 (b) means in embodiment 1, the figure of the relation between gap and average thickness.

Figure 28 means in embodiment 2, affects the thickness of metallic plate of bond quality and the figure of the relation between gap, and it shows the situation of the thickness of the thickness of Ad side=Re side.

Figure 29 means in embodiment 1, the size of each twin shaft shoulder stirring head dummy instrument and the table of connecting state when the distance between shaft shoulder section is fixed as to 5.8mm.

Figure 30 means in embodiment 2, the size of each twin shaft shoulder stirring head dummy instrument and the table of connecting state when the distance between shaft shoulder section is fixed as to 2.8mm.

Figure 31 means in reference example, the size of each twin shaft shoulder stirring head dummy instrument and the table of connecting state when the distance between shaft shoulder section is fixed as to 11.5mm.

Figure 32 means in embodiment 3, the figure of the impact (gap of docking section is 0mm) that the screw thread ratio is brought the difference of height of metallic plate.

Figure 33 means in embodiment 3, the figure of the impact (gap of docking section is 1.5mm) that the screw thread ratio is brought the difference of height of metallic plate.

Figure 34 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition A.

Figure 35 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition B.

Figure 36 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition C.

Figure 37 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition D.

Figure 38 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition E.

Figure 39 is the table after the result of embodiment 3 is gathered.

Figure 40 is the table after the situation when making the twin shaft shoulder stir the head dummy instrument towards anticlockwise gathers.

Figure 41 means the front view of engaging form or the docking form of embodiment 4, and wherein, Figure 41 (a) means type I, and Figure 41 (b) means Type II, and Figure 41 (c) means type-iii.

Figure 42 means the figure of result of angular deformation of the type I of embodiment 4.

Figure 43 means the figure of result of angular deformation of the Type II of embodiment 4.

Figure 44 means the figure of result of angular deformation of the type-iii of embodiment 4.

Figure 45 is the table after the direction of rotation of the twin shaft shoulder of embodiment 4 stirring head dummy instrument, spiral fluted coiling direction, engaging form are gathered.

Figure 46 is that Figure 54 (a) means body to be tested for meaning the figure of embodiment 6, and Figure 54 (b) is the table after each condition is gathered.

Figure 47 means the figure of the incidence relation of the thickness of slab a of embodiment 6 and length c.

The specific embodiment

[embodiment 1]

Below, with reference to accompanying drawing, embodiments of the present invention are elaborated.As shown in Figure 1, the friction agitating device 1 of present embodiment is that the docking section N of pair of metal plate after docking rub and stirs the device of joint.Front end at friction agitating device 1 is equipped with twin shaft shoulder stirring head dummy instrument 5.At 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 Fig. 1.

As shown in Figure 2 (a) shows, 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 has the main part 101 that comprises hollow bulb 100a, from the left surface upper and lower side tabular end 102,103 that (hollow material 100B mono-side) stretches out respectively towards left side of main part 101.

Main part 101 consists of four plane materiel material 104,105,106,107, and its cross section forms rectangle.Tabular end 102,103 is tabular, and perpendicular to plane materiel material 105.Half left and right that the left and right directions length of tabular end 102,103 is 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, be equivalent to the position of " metallic plate " in claims.

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

When 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 the tabular end 102 of hollow material 100A is docked with the end face 102a of the tabular end 102 of hollow material 100B, the end face 103a of the tabular end 103 of hollow material 100A is docked with the end face 103a of the tabular end 103 of hollow material 100B.As shown in Fig. 2 (b), when 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 Fig. 2 (b), the part after making end face 102a and end face 102a, end face 103a and end face 103a docking is called to " docking section N ".When docking section N is engaged, preferably make end face 102a and end face 102a close contact, but sometimes because of the tolerance of

hollow material

100A, 100B or the frictional heat while engaging, tabular end 102,102 is deformed, and between end face 102a and end face 102a the tiny gap of generation.Docking section N comprises the concept that produces the situation of slight gap between end face 102a and end face 102a.

In addition, in the present embodiment, exemplified with the tabular end using hollow material, as the object that will engage, but the metal that the object that will engage stirs by rubbing forms, so long as be tabular member, is not particularly limited.

As shown in Figure 3, friction agitating device 1 mainly consists of with the throw unit 2 that is fixed on the 1a of chuck section inside the 1a of chuck section.As shown in Figure 4, the 1a of chuck section is the cylindrical structural member that comprises flange, and uses screw B1 and be connected with the main body D of friction agitating device 1.The 1a of chuck section rotates by the driving of friction agitating device 1 position pivoted.Be formed with barrel surface 1b interior week at the 1a of chuck section.

As shown in Figure 4, throw unit 2 consists of keeper 3, sliding axle 4, twin shaft shoulder stirring head dummy instrument 5 and sliding members 6.Throw unit 2 can be installed and removed with respect to the 1a of chuck section.

Keeper 3 is the members that are built-in with sliding axle 4 and are fixed on the 1a of chuck section inside.Keeper 3 is cylindric.Outer surface at keeper 3 is formed with the tabular surface 3a that flatly extends setting along above-below direction, therefore, forms tiny gap between barrel surface 1b and tabular surface 3a.Bolt 2B, 2B are fastening towards radially carrying out from the outer surface of the 1a of chuck section, its front end and tabular surface 3a butt.By this, the 1a of chuck section and keeper 3 rotate integratedly.In addition, as shown in Figure 5, keeper 3 is formed with the keyway 3b of the slotted hole shape radially connected.

As shown in Figure 4, 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 5, the outer surface at sliding axle 4 is formed with outwardly side-prominent key 4a.Key 4a engages with keyway 3b, and by this, keeper 3 rotates integratedly with sliding axle 4.

As shown in Figure 6, the twin shaft shoulder stirs head dummy instrument 5 and is for example formed by tool steel, and is connected with sliding axle 4.The twin shaft shoulder stirs head dummy instrument 5 and the 1a of chuck section, keeper 3 and sliding axle 4 integratedly towards the rotation of both forward and reverse directions.The twin shaft shoulder stirs head dummy instrument 5 and has the first shaft shoulder section 11, below the first shaft shoulder section 11 across the second spaced shaft shoulder section 12, pin 13 by the first shaft shoulder section 11 with 12 links of the second shaft shoulder section.

The first shaft shoulder section 11 and the second shaft shoulder section 12 are cylindric, and have identical external diameter.Pin 13 is cylindric, and the first shaft shoulder section 11 and the second shaft shoulder section 12 are linked.Pin 13 connects the second shaft shoulder section 12.The pin 13 that connects the second shaft shoulder section 12 passes through fastening nuts in the lower end of the second shaft shoulder section 12.Outer peripheral face at pin 13 is carved with top helicla flute 13a and lower part helical groove 13b.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 pin 13 from the lower end of the first shoulder axle 11.In the present embodiment, make the 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 pin 13 from the upper end of the second shoulder axle 12.In the present embodiment, make the 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 is to carve and to establish towards the mode of left coiling from the top down.

By forming as mentioned 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, the above-mentioned metal towards above-below direction moves with the rotation of stirring the pin 13 of head dummy instrument 5 because of the twin shaft shoulder movement of metal on Zhou Fangxiang is compared, and is only trace.

For spiral fluted coiling direction or the ratio of establishing of carving, as long as stir the position relationship of head dummy instrument 5, the direction of rotation of twin shaft shoulder stirring head dummy instrument etc. according to the decorative cover of the metallic plate that will engage and twin shaft shoulder, suitably set.In the present embodiment, though pin is provided with to 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 to 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 section 11 sides, in the second shaft shoulder section 12 sides, carve and establish left-hand thread, also can carve and establish left-hand thread in the first shaft shoulder section 11 sides, in the second shaft shoulder section 12 sides, carve and establish right-hand thread.

As shown in Figure 6, comparatively it is desirable to, make the twin shaft shoulder stir the length apart from Z(pin 13 between the shaft shoulder section 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 little 0.2mm of thickness T than the tabular end 102 of hollow material 100A apart from Z between shaft shoulder section.

In addition, in the situation that can be by docking section N(with reference to Fig. 2 (b)) the gap of

end face

102a, 102a be set as below 0.75mm, even if the thickness T of tabular end 102 and the spacing Z of shaft shoulder section are set as identical, T-Z=0, also can obtain good engagement state.

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

In the situation that the gap of end face 102a, the 102a of docking section N can be 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 section is set as to 0.4mm≤T-Z≤0.8mm.

In addition, comparatively it is desirable to, the twin shaft shoulder is stirred to square value that head dummy instrument 5 sets the external diameter X that makes the first shaft shoulder section 11 and the second shaft shoulder section 12 for the value after divided by the square value of the external diameter Y of pin 13 larger than 2.0.Stir head dummy instrument 5 according to above-mentioned twin shaft shoulder, can utilize the first shaft shoulder section 11 and the second shaft shoulder section 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, the twin shaft shoulder is stirred to square value that head dummy instrument 5 sets the external diameter X of the first shaft shoulder section 11 and the second shaft shoulder section 12 for and deduct the value obtained after the square value of external diameter Y of pin 13, and the value of the square value of external diameter Y that makes pin 13 after divided by value obtained above is larger than 0.2.Stir head dummy instrument 5 according to above-mentioned twin shaft shoulder, in the time of can guaranteeing to engage fully, pin, with respect to the tensile resistence of the material resistance upwards produced at tool spindle, therefore, can be prevented the breakage of shotpin 13.

In addition, comparatively it is desirable to, the twin shaft shoulder is stirred to square value that head dummy instrument 5 sets the external diameter Y that makes pin 13 for and divided by the external diameter Y of pin 13, take advantage of the value apart from after Z between shaft shoulder section larger than 1.2.Stir head dummy instrument 5 according to above-mentioned twin shaft shoulder, in the time of can fully guaranteeing to engage, the fracture resistence force of pin mobile material resistance with respect to the direction along contrary with the instrument direct of travel, therefore, can prevent the breakage of shotpin 13.For above-mentioned basis, will be put down in writing in an embodiment.

As shown in Fig. 3 (b) and Fig. 4, sliding members 6 is to make sliding axle 4 with respect to keeper 3 mobile mechanism swimmingly on above-below direction.Sliding members 6 forms by the bearing groove 8 on the inner surface that is formed on keeper 3 with at the ball bearing 9 of bearing groove 8 interior slips.As shown in Figure 3 (b), bearing groove 8 is that side-looking is oval shape at the inner surface section bar of keeper 3.The diameter of the depth ratio ball bearing 9 of bearing groove 8 is little.Ball bearing 9 has a plurality of in the internal configurations of bearing groove 8.One end of ball bearing 9 and the outer surface sliding-contact of sliding axle 4, and the inner surface sliding-contact of the other end and bearing groove 8.

In addition, the structure of sliding members 6 is not limited to the structure of present embodiment.As long as sliding members 6 is configured to, can make keeper 3 and sliding axle 4 rotate integratedly, and make sliding axle 4 move and get final product swimmingly on above-below direction with respect to keeper 3.For example, also can bearing groove 8 and ball bearing 9 be set in sliding axle 4 sides.

At this, rubbing while stir engaging, because frictional heat makes the temperature of tabular end 102,102, rise sometimes, and make tabular end 102,102 towards above or below warpage.In the friction agitating device 1 of present embodiment, because sliding axle 4 forms, can move with respect to keeper 3, therefore, in tabular end 102 towards above for example during warpage, the 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 during warpage, the 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 the twin shaft shoulder that uses embodiment 1 is stirred to head dummy instrument 5 describes.

In the joint method of embodiment 1, make the twin shaft shoulder stir head dummy instrument 5 and transfer and engaged towards dextrorotation.Specifically, in this joint method, the docking operation that hollow material is docked each other and the twin shaft shoulder is stirred to the joint operation that head dummy instrument 5 inserts docking section N.At this, surperficial Sa is set as to decorative cover.

In the docking operation, as shown in Figure 2, 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 mid point of a side the end face 102a mode face overlapping with the mid point of the opposing party's end face 102a contact.After docking, can by modes such as welding, engage along docking section N temporarily, and make hollow material 100A and hollow material 100B not separated.After making hollow material 100A and hollow material 100B docks, fixedly make it not move both.

In engaging operation, at first, in the outside of docking section N, make Xiao13 center 13c be positioned at the position overlapping with the center Nc of docking section N.Then, as shown in Figure 7, the twin shaft shoulder stirring head dummy instrument 5 of right rotation is moved along docking section N.After the twin shaft shoulder stirs head dummy instrument 5 and inserts docking section N, utilize the stirring that rubs of metals around 13 pairs of pins 13 of pin of High Rotation Speed, and make between tabular end 102 integrated.Be formed with plastification zone W on the track of pin 13.

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 engaged, the twin shaft shoulder stirs head dummy instrument 5 and also can move swimmingly on above-below direction along with above-mentioned warpage.The height and position that by this, can suppress the center Nc of 13cYu docking section, Xiao13 center N is offset.Therefore, can prevent that bonding station is offset.

In addition, as present embodiment, by being set as below the thickness T of tabular end 102 apart from Z between the shaft shoulder section of the twin shaft shoulder being stirred to head dummy instrument 5, just can be pressed the metal of Plastic Flow, therefore, can prevent that the metal because of friction stirring Plastic Flow is spilled over to the outside of the first shaft shoulder section 11 and the second shaft shoulder section 12.By this, can suppress the generation of joint defect.In addition, if the value of T-Z surpasses 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 pin 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 the ratio more than 25%, therefore, the metal 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 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, the fine finishining that just can easily be made surface (decorative cover) Sa become level and smooth is processed.

In addition, in embodiment 1, the ratio of top helicla flute 13a and lower part helical groove 13b is 50:50, therefore, as shown in Figure 7 (a), can make the amount of metal equalization in upside and lower side shifting.By this, can further prevent Nc position, the center skew of shotpin 13 center 13cYu 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.

When being engaged operation, comparatively it is desirable to, at surface (decorative cover) Sa such as utilizing the cooling device can supply with cooled gas or liquid etc. to tabular end 102, carry out in cooling being engaged.By this, can suppress the distortion of tabular end 102 and make to engage the precision raising.In addition, also can be engaged the 102 back side, tabular end Sb side being carried out in cooling.

[embodiment 2]

In the joint method of embodiment 2, spiral fluted structure and direction of rotation that the twin shaft shoulder stirs the head dummy instrument are different from embodiment 1.In the explanation of embodiment 2, for the point identical with embodiment 1, detailed.

Fig. 8 means that the twin shaft shoulder of embodiment 2 stirs the side view of head dummy instrument.As shown in Figure 8, the outer peripheral face that stirs the pin 13 of head dummy instrument 5A at the twin shaft shoulder of embodiment 2 is carved the top helicla flute 13a that is provided with the left-hand thread that is formed on the first half and the lower part helical groove 13b that is formed on the right-hand thread of Lower Half.That is to say, top helicla flute 13a is to carve and to establish towards the mode of left coiling from the top down, and lower part helical groove 13b is to carve and to establish towards the mode of right coiling from the top down.

Comparatively it is desirable to, the twin shaft shoulder stirs below the thickness of slab T of the tabular end 102 that distance between the shaft shoulder section of head dummy instrument 5A (sell 13 length) Z is hollow material 100A.For example, in the present embodiment, the little 0.4mm of thickness of slab T than the tabular end 102 of hollow material 100A apart from Z between shaft shoulder section.

Then, the joint method that the twin shaft shoulder that uses embodiment 2 is stirred to head dummy instrument 5A describes.

In the joint method of embodiment 2, as shown in Figure 9, make the twin shaft shoulder stir head dummy instrument 5A and engaged towards left-handed transferring.Specifically, in above-mentioned joint method, the docking operation that hollow material is docked each other and the twin shaft shoulder is stirred to the joint operation that head dummy instrument 5A inserts docking section N.At this, surperficial Sa is set as to decorative cover.Because the docking operation is identical with embodiment 1, therefore, description thereof is omitted.

In engaging operation, at first, in the outside of docking section N, make Xiao13 center 13c be positioned at the position overlapping with the center Nc of docking section N.Then, as shown in Figure 9, the twin shaft shoulder stirring head dummy instrument 5A of anticlockwise is moved along docking section N.After the twin shaft shoulder being stirred to head dummy instrument 5A and inserting docking section N, utilize the stirring that rubs of metals around 13 pairs of pins 13 of pin of High Rotation Speed, and make tabular end 102 integrated each other.Be formed with plastification zone W on the track of pin 13.

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 pin 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 the ratio more than 25%, therefore, the metal 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 decorative cover Sa producing groove V, even or be formed with groove V and also can reduce the degree of depth of groove V.

In addition, in embodiment 2, 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 Nc position, the center skew of shotpin 13 center 13cYu 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 10 (a) shows, on tabular end 102A this aspects different from the thickness of 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 the mid point on the short transverse of the mid point on the short transverse of tabular end 102A and tabular end 102B dock.

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

When friction is stirred, in the situation that make throw towards right rotation, the metal of Plastic Flow has from the left side of instrument direct of travel (shear 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 the instrument direct of travel, therefore, suppose to have gap between metallic plate, 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 zone after making to engage of metal.In addition, in the situation that make throw towards anticlockwise, the right side of instrument direct of travel is for shearing side, and left side is flow side.

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

In variation 2, as shown in Figure 10 (b), on tabular end 102C this aspects different from the thickness of 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 the mid point on the short transverse of the mid point on the short transverse of tabular end 102C and tabular end 102D dock.

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

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

As shown in Figure 11 (a), Figure 11 (b), the throw unit of variation 3 comprises that keeper 50, sliding axle 51, sliding members 52 and twin shaft shoulder stir head dummy instrument 5.The structure and the first embodiment that are mainly keeper 50 and sliding axle 51 are different.

Keeper 50 consists of with the collar part 54 that is formed on main body cylinder section 53 lower ends main body cylinder section 53.Main body cylinder section 53 is cylindric.As shown in Figure 11 (b), at the inner surface of main body cylinder section 53, be formed with towards interior side-prominent raised line 53a, 53a.Raised

line

53a, 53a are formed on relative position.The cross section of raised line 53a is roughly semi-circular shape, and forms in the length range on the short transverse of main body cylinder section 53.

The cross section of collar part 54 is the L font, overlooks in the form of a ring, and engages with the lower end of main body cylinder section 53.Collar part 54 comprises the limiting section 54a more inwards stretched out than the inner surface of main body cylinder section 53.

The stage portion 57 that sliding axle 52 comprises large-diameter portion 55, is arranged on the minor diameter part 56 of the bottom of large-diameter portion 55, formed by large-diameter portion 55 and minor diameter part 56.As shown in Figure 11 (b), at the outer surface of large-diameter portion 55, be formed with recessed 55a, the 55a corresponding with raised line 53a.Recessed 55a has the shape roughly the same with raised line 53a, and forms in the length range on the short transverse of large-diameter portion 55.

Sliding members 52 has the structure roughly the same with embodiment 1, as shown in Figure 11 (b), has bearing groove 52a and ball bearing 52b.Sliding members 52 makes sliding axle 51 move swimmingly vertically with respect to keeper 50.

Engage with recessed 55a of sliding axle 52 by the raised line 53a by keeper 51, can not only allow movement in the axial direction, and can make keeper 51 and sliding axle 52 rotate integratedly.Because raised line 53a is formed on the total length of short transverse of keeper 51, therefore, can increase the displacement of sliding axle 51.In addition, because the total length of raised line 53a engages with recessed 55a, therefore, can make sliding axle 52 stably move.In addition, because raised line 53a and recessed 55a clip rotating shaft, be arranged on both sides, therefore, can more stably move.In addition, by making stage portion 57 butts of limiting section 54a and sliding axle 51, just can towards below, move by limit slippage axle 51.

In addition, in embodiment 1, embodiment 2, variation 1～variation 3, formed as mentioned above the throw unit, but be not limited to this.For example, also can make the horizontal cross sectional geometry of keeper and sliding axle be polygon.

[embodiment 3]

Below, embodiment of the present invention 3 is described.In embodiment 3, the situation that illustration is engaged double face slab.Up, down, left, right, before and after in description of the present embodiment is according to the arrow of Figure 12.

As shown in figure 12, double face slab 201 is metal slim strip component, and it mainly consists 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, a plurality of double face slabs 201 being engaged, just as the structure such as 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 material of double face slab 201 is so long as the metal that can rub 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 arranged and the tabular end 220, left side of extending setting from central portion 205 towards left side forms.

Tabular end 210, right side by the first outside plate heavy section 211, the first hook portion 212, and the first covering section (Japanese: the first meat Sheng section) 213 form.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 the first thinner wall section 214 extend arranged towards right side with from vertical the first extension 215 stretched out of the first thinner wall section 214, form./ 3rd left and right that the thickness of the first thinner wall section 214 is 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 first to stretch out inclined plane 216 along with what just tilt the closer to the mode of support plate 204 towards inner panel 203 sides at the sidepiece of the first extension 215.The first covering section 213 gives prominence to certain thickness and is 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 towards top.

Tabular end 220, left side mainly consists of the second outside plate heavy section 221, the second hook portion 222 and the second covering section 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 consists of second thinner wall section 224 of extending towards left side and the second extension 225 vertically stretched out with respect to the second thinner wall section 224./ 3rd left and right that the thickness of the second thinner wall section 224 is 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.At the left end of the second outside plate heavy section 221, 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.It is identical that 216 angle of inclination, inclined plane is stretched out on the second heavy section inclined plane 226 and first.The second covering section 223 gives prominence to certain thickness and is formed on the position heavy wall from the upper surface of the second outside plate heavy section 221 towards top.

Inner panel 203 extends the tabular end 230, right side arranged 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 consists of the first inner panel heavy section 231, the first covering section 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 section 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 consists of the second inner panel heavy section 241, the second covering section 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 section 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 used is in the present embodiment described.As shown in Figure 13, Figure 14, friction agitating device 261 consists of the 261a of chuck section, the throw unit 262 that is fixed on the 261a of chuck section.With embodiment 1 similarly, the 261a of chuck section by bolt with the friction agitating device 261 main body (not shown) engage.

Throw unit 262 stirs head dummy instrument 265 by keeper 263, sliding axle 264, twin shaft shoulder and not shown sliding members forms.

As shown in figure 14, keeper 263 is the members that are built-in with sliding axle 264 and are arranged on the inside of the 261a of chuck section.Keeper 263 is cylindric.Be formed with the keyway 263b of the slotted hole shape connected on radial direction at keeper 263.

As shown in figure 14, sliding axle 264 is cylindric, and it is the member be inserted in the hollow bulb of keeper 263.Sliding axle 264 can move up at upper and lower with respect to keeper 263.Be formed with outstanding toward the outer side key 264a on the outer surface of sliding axle 264.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 15, the twin shaft shoulder stir head dummy instrument 265 by the first shaft shoulder section 252, the second shaft shoulder section 253 and be arranged on the first shaft shoulder section 252 and the second shaft shoulder section 253 between pin 254 form.The first shaft shoulder section 252, the second shaft shoulder section 253, sell 254 and all be roughly cylindric, and coaxial the setting.It is by making pin 254 move bonding part in High Rotation Speed that the twin shaft shoulder stirs head dummy instrument 265, rubs and stirs the instrument engaged.

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

The second shaft shoulder section 253 forms the structure that has groove at outer surface.The second shaft shoulder section 253 comprises large-diameter portion 253a, tapering 253b and upper surface 253c.Tapering 253b is undergauge gradually towards top.The external diameter Y1 of large-diameter portion 253a is less than the external diameter X1 of large-diameter portion 252a.In addition, the diameter Y2 of upper surface 253c is identical with the diameter Y2 of lower surface 252c.

Carve and be provided with the helicla flute 255 that the mode with left-hand thread forms at the outer surface of pin 254.That is to say, helicla flute 255 is to carve and to establish towards the mode of anticlockwise from the top down.External diameter U diameter group X2 and the diameter Y2 of pin 254 are little.The first shaft shoulder section 252 is connected with sliding axle 264 by nut.

Comparatively it is desirable to, the twin shaft shoulder stirs below the thickness of slab (being the total of the thickness of the first outside plate heavy section 211 and the first covering section 213 in the present embodiment) that distance between the shaft shoulder section of head dummy instrument 265 (sell 254 length) is set as the part that will engage.As long as the degree of depth of the groove of helicla flute 255 or spacings etc. the distance between the material of the metallic plate stirred according to rub or the thickness of slab of the part that will engage, shaft shoulder section etc. are carried out suitable setting.

Sliding members (not shown) is formed between keeper 263 and sliding axle 264, and can make sliding axle 264 move up and down swimmingly with respect to keeper 263.Sliding members is due to identical with embodiment 1, so detailed.

In friction agitating device 261, because forming, can move with respect to keeper 263 sliding axle 264, therefore, friction agitating device 261 be configured to the metallic plate that will engage for example towards above during warpage, the 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 during warpage, the twin shaft shoulder stir head dummy instrument 265 can along with above-mentioned warpage towards below mobile predetermined distance.By this, in the time of can suppressing friction stirring joint, the 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 of present embodiment described.At this, the situation that illustration is engaged after two identical shaped double face slabs 201 are arranged side by side.In above-mentioned joint method, carry out preparatory process and engage operation.

In preparatory process, as shown in figure 16,201,201 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 each self-corresponding key element of above-mentioned double face slab, can add that symbol " A ", symbol " B " are distinguished.

In preparatory process, specifically, the first hook portion 212A of double face slab 201A is engaged with the second hook portion 222B of double face slab 201B, 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, the first end face 233A, with after the second end face 243B docks, forms 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 C ".

After carrying out preparatory process, the upper surface flush of the upper surface of the first 213A of covering section and the second 223B of covering section, simultaneously, 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 simultaneously, the lower surface of the first 232A of covering section flushes with the lower surface of the second 242B of covering section.After the assembly that forms double face slab, use fixture to fix this assembly it can not be moved.

In engaging operation, as shown in figure 17, stir head dummy instrument 265 with the twin shaft shoulder first of holding section M joint is engaged to operation and second of docking section N joint is engaged to operation.

In the first joint operation, make double face slab 201A be configured in the left side of direct of travel.Then, holding section M is inserted after aiming in the center that will stir the short transverse of the holding section M on the Center-to-Center line C of pin 254 of head dummy instrument 265 towards the twin shaft shoulder of right rotation.Then, rub and stir joint along holding section M from front side towards rear side.In addition, the track moved along twin shaft shoulder stirring head dummy instrument 265 on the M of holding section is formed with plastification zone W1(with reference to Figure 18).

In the second joint operation, as shown in figure 18, after the first joint operation finishes, the assembly of double face slab is turned over, and again fixedly the assembly of double face slab it can not be moved.Then, docking section N is inserted after aiming in the center that will stir the short transverse of the docking section N on the Center-to-Center line C of pin 254 of head dummy instrument 265 towards the twin shaft shoulder of right rotation.Then, rub and stir joint along docking section N from front side towards rear side.The track moved along twin shaft shoulder stirring head dummy instrument 265 on the N of docking section is formed with plastification zone (not shown).By above operation, outside plate 202A engages with outside plate 202B, and inner panel 203A engages with inner panel 203B.

Friction stirring connecting method according to present embodiment described above, by the first hook portion 212A that makes outside plate 202A, with the second hook portion 222B of outside plate 202B, engage, 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.In the situation that

double face slab

201A, 201B are rectangular, if inner panel 203A and inner panel 203B also arrange hook portion, can make the operation of engaging become difficult, but, according to present embodiment, can make to engage operation and become easy.

In addition, in preparatory process, when 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 engaged when sliding, therefore, make to engage operation and become easy.Specifically, while from the top of loaded double face slab 201B, putting down double face slab 201A, 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 be engaged with simple structure.In addition, by covering section (213A, 223B, 232A, 242B) is set, metal deficiency in the time of just can preventing friction stirring joint.In the present embodiment, be provided with the helicla flute 255 of left-hand thread 254 quarters at pin, and make the 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 the trend moved towards the second shaft shoulder section 253 is arranged.Thereby, by covering section (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 section 252, just can avoid the metal deficiency of the first shaft shoulder section 252 sides.

In addition, while formerly docking section N being engaged,

double face slab

201A, 201B likely can separate, but, in the joint operation of present embodiment, owing to first holding section M being engaged, therefore, can prevent that

double face slab

201A, 201B divide out when docking section N is engaged.

In addition, the shape of

double face slab

201A, 201B or engaging form are so long as the form that both can not separate, not special the 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 202 of a double face slab, 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 engaged and engage after above-mentioned double face slab alternately is arranged side by side.In addition, can also as shown in figure 19, make the sidepiece of the first extension 215A and the second extension 225B for the shape of 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 of embodiment 1 to stir head dummy instrument 5), carry out the thickness of the metallic plate (tabular end) on rubbing, stirring joint and the test what kind of impact metallic plate gap each other brings investigated on engagement state.As shown in figure 20, for rubbing, stir the test body (materials A 6063-T5) of the pair of metal plate engaged, make its thickness change respectively to prepare to test body H1～H19." Ad side " refers to that the twin shaft shoulder stirs a direction of rotation side identical with direct of travel of head dummy instrument.That is to say, the twin shaft shoulder refers to the left side of direct of travel while stirring the head dummy instrument towards right rotation." Re side " refers to that the twin shaft shoulder stirs a direction of rotation side contrary with direct of travel of head dummy instrument.That is to say, the twin shaft shoulder refers to the right side of direct of travel while stirring the 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 section external diameter (diameter of face in shaft shoulder section, that contact with metallic plate) that the twin shaft shoulder used in test stirs the head dummy instrument is set as 20mm, and the pin external diameter is set as 12mm, and the distance between shaft shoulder section is set as 5.8mm.The speed setting that the twin shaft shoulder stirs the 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 enforcement mode 1 is put down in writing, 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, from the micro-tissue of X ray penetration test and cross section, judge bond quality.

Figure 21 means in embodiment 1, the figure of the relation between the gap of test body H1 and the thickness at junction surface.Figure 22 means 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 zone W identical meanings.In addition, " the Ad section " at the junction surface of embodiment 1, " Cr section ", " Re section " presentation graphs 7(b) shown in Ad section, central portion, each position of Re section at junction surface (plastification zone W).

As shown in figure 21, when the thickness by metallic plate all is set as each other 6.0mm and is engaged, if the not enough 0.75mm in gap, the minimizing of the thickness of Ad section, Cr section, Re section is all very little, but if gap is more than 0.75mm, along with gap increases, the thickness of Ad section, Cr section, Re section all reduces.Once gap surpasses 1.2mm, the not enough 5.8mm of the thickness at junction surface and produce joint defect.

As shown in figure 22, when the thickness by metallic plate all is set as each other 6.4mm and is engaged, if the not enough 0.75mm in gap, the minimizing of the thickness of Ad section, Cr section, Re section is all very little.If gap, at 0.75～1.75mm, although the thickness of Ad section, Cr section, Re section 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 21 and Figure 22, if the thickness of the Cr section at junction surface is below 5.8mm, can produce joint defect.That is to say, even if there is gap each other in metallic plate, as long as supply with metal by Plastic Flow so that the thickness of the Cr section at junction surface can not be less than with shaft shoulder section 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 zone) is more than the distance between shaft shoulder section.

Figure 23 means in embodiment 1, affects the plate thickness of bond quality and the table of the relation between gap, and it shows the situation of the thickness of the thickness of Ad side=Re side.In the drawings, " zero " means the good situation of connecting state, and " * " means the bad situation of connecting state.

Known according to Figure 23, even gap increases, as long as metallic plate also increases, still have the situation that connecting state is good.But the thickness of metallic plate and the difference between the distance between shaft shoulder section surpass 0.8mm(in the present embodiment if can know, the Thickness Ratio 6.6mm of metallic plate is large), the interior pressure produced between shaft shoulder section becomes large, and the life-span of instrument is significantly descended.

In addition, known according to Figure 23, the distance between shaft shoulder section be 5.8mm, and the gap between metallic plate is 0～0.75mm when following, and the thickness that needs only metallic plate is 5.8～6.6mm, and connecting state is good.That is to say, as long as will between the thickness T of metallic plate and shaft shoulder section, apart from Z, set 0≤T-Z≤0.8mm for, connecting state is good.

In the situation that the T-Z value is less than 0, that is to say, when larger than the thickness T of tabular end 102 apart from Z between shaft shoulder section, metal after Plastic Flow easily from the first shaft shoulder section 11 and the second 12(of shaft shoulder section with reference to Fig. 7 (a)) overflow, therefore, the density of junction surface (plastification zone W) reduces.By this, the possibility that joint defect produces improves.Even if metallic plate gap to each other is 0～0.75mm, also can stir the frictional heat engaged because of friction and make the temperature of metallic plate increase, and because metallic plate expands, gap be disappeared, therefore, can think that connecting state is roughly good.

In addition, known according to Figure 23, the distance between shaft shoulder section be 5.8mm, and metallic plate gap each other is 0～1.0mm when following, and the thickness that needs only metallic plate is 6.0～6.6mm, and connecting state is good.That is to say, can know that connecting state is good as long as will between the thickness T of metallic plate and shaft shoulder section, apart from Z, set 0.2≤T-Z≤0.8mm for.If the T-Z value is less than 0.2mm, the metal after Plastic Flow easily overflows from the first shaft shoulder section 11 and the second shaft shoulder section 12, and therefore, the density at junction surface reduces.By this, the possibility that joint defect produces improves.

In addition, known according to Figure 23, the distance between shaft shoulder section be 5.8mm, and the gap between metallic plate is when being greater than 1.0mm and being that 1.75mm is following, and the thickness that needs only metallic plate is 6.2～6.6mm, and connecting state is good.That is to say, can know that connecting state is good as long as will between the thickness T of metallic plate and shaft shoulder section, apart from Z, set 0.4≤T-Z≤0.8mm for.If the T-Z value is less than 0.4mm, the metal after Plastic Flow easily overflows from the first shaft shoulder section 11 and the second shaft shoulder section 12, and therefore, the density at junction surface reduces.By this, the possibility that joint defect produces improves.

Known according to Figure 23, the distance between shaft shoulder section be 5.8mm, and metallic plate gap each other is when being greater than 1.75mm and being that 2.00mm is following, and the thickness that needs only metallic plate is 6.6mm, and 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 section for T-Z=0.8mm.If the T-Z value is less than 0.8mm, because the metal after Plastic Flow easily overflows from the first shaft shoulder section 11 and the second shaft shoulder section 12, therefore, make the density at junction surface reduce.By this, the possibility that joint defect produces improves.

Figure 24 means the thickness of the metallic plate that affects bond quality and the table of the relation between gap, its show the varied in thickness that makes the Ad side and by the thickness of Re side fixing situation.Figure 25 means the thickness of the metallic plate that affects bond quality and the table of the relation between gap, 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 24, 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 25, the thickness of Ad side is fixed as to 6.2mm, 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, Yi Bian make the varied in thickness of the left and right of the metallic plate that will dock, Yi Bian observe the bond quality under different gap.

By after Figure 24 and Figure 25 contrast, the good situation in Figure 24 is more.In other words, shown in figure 32, at the metallic plate by the Re side, be fixed as 6.0mm, and make the metallic plate of Ad side in the situation that change more than 6.2mm, the situation that connecting state is good is more.This is owing to making the twin shaft shoulder stir the head dummy instrument towards right rotation in embodiment 1, therefore, metal after plastification is flowed is easily from left side (Ad side) (Re side) movement towards right side of direct of travel, in the situation that there is gap to each other in metallic plate, the metal of Ad side can this gap of landfill.Therefore, if as the condition of Figure 25, make the plate thickness on Thickness Ratio direct of travel right side of 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 24, 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 26 and Figure 27.Thickness=the 6.6mm of plot point " ◆ " expression test body H4(Ad side and the thickness=6.6mm of Re side).Thickness=the 6.0mm of plot point " ■ " expression test body H10(Ad side and the thickness=6.6mm of Re side), the plot point "●" means to test the thickness=6.6mm of body H16(Ad side and the thickness=6.0mm of Re side).

As shown in Figure 26 (a), can know in the thickness of the Cr at junction surface section, according to the order of testing body H4, H16, H10, diminish.That is to say, if can know, the metallic plate of Ad side is thinner than Re side, and the Cr section thickness at junction surface will diminish.

As shown in Figure 26 (b), can know in the thickness of the Ad at junction surface section, test body H4, H10, H16 are the 5.8mm left and right, and reduce to some extent than the thickness before engaging.Particularly, when viewing test body H4, H16, can know that thickness has the minimizing of certain degree.

As shown in Figure 27 (a), can know in the thickness of the Re at junction surface section, 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 26 (b) and Figure 27 (a) overall contrast, the thickness of known Re section is larger than the thickness of Ad section generally.

As shown in Figure 27 (b), can know the order increase of the average thickness at junction surface by test body H10, H16, H4.

As shown in Figure 26, Figure 27, service test body H4, H16, compare with test body 10, can increase the thickness of Cr section.But, if service test body H4, although can increase the thickness at junction surface, correspondingly can make the interior pressure between shaft shoulder section become large and the possibility that reduce life tools is improved.Therefore, by as testing body H16, by the thickness setting of the metallic plate of Ad side, be larger than the thickness of the metallic plate of Re side, not only can make the internal drop between shaft shoulder section low, and can increase the thickness of the Cr section at junction surface.

Use the friction agitating device 1(twin shaft shoulder of embodiment 1 to stir head dummy instrument 5), carry out the thickness of the metallic plate (tabular end) on rubbing, stirring joint and the test what kind of impact metallic plate gap each other brings investigated on engagement state.Metallic plate gap each other is each 0.25mm that changes between 0～2.0mm.The shaft shoulder section external diameter (diameter of face in shaft shoulder section, that contact with metallic plate) that the twin shaft shoulder used in test stirs the head dummy instrument is set as 10mm, and the pin external diameter is set as 6mm, and the distance between shaft shoulder section is set as 2.8mm.The speed setting that the twin shaft shoulder stirs the 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 enforcement mode 1 is put down in writing, 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, from the micro-tissue of X ray penetration test and cross section, judge bond quality.

Stir the test body (materials A 6063-T5) of the metallic plate engaged for rubbing, use the 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 28 means in embodiment 2, affects the thickness of metallic plate of bond quality and the figure of the relation between gap, and it shows the situation of Ad side=Re side.In the drawings, " zero " means the good situation of connecting state, and " * " means the bad situation of connecting state.

Known according to Figure 28, even gap increases, as long as the thickness of metallic plate still has with respect to also increasing apart from Z between the shaft shoulder section situation that connecting state is good.But the thickness of metallic plate and the difference between the distance between shaft shoulder section surpass in 0.6mm(the present embodiment if can know, the Thickness Ratio 3.4mm of metallic plate is large), the interior pressure produced between shaft shoulder section becomes large, and the life-span of instrument is significantly descended.

In addition, known according to Figure 28, is 2.8mm apart from Z between shaft shoulder section, 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 section for 0.2≤T-Z≤0.6mm.If the T-Z value is less than 0.2, the metal of Plastic Flow easily overflows from the first shaft shoulder section 11 and the second shaft shoulder section 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, because of friction, stir the frictional heat engaged and make the temperature of metallic plate increase, because metallic plate expands, gap is disappeared, therefore, can think that connecting state is roughly good.

In addition, known according to Figure 28, the distance between shaft shoulder section be 2.8mm, and metallic plate gap each other is when being greater than 0.75mm and being that 1.50mm is following, and the thickness that needs only metallic plate is 3.2～3.4mm, and 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 section for 0.4≤T-Z≤0.6mm.If the T-Z value is less than 0.4mm, the metal after Plastic Flow easily overflows from the first shaft shoulder section 11 and the second shaft shoulder section 12, and the density at junction surface is reduced.By this, the possibility that joint defect produces improves.

In addition, known according to Figure 28, the distance between shaft shoulder section be 2.8mm, and metallic plate gap each other is when being greater than 1.50mm and being that 1.75mm is following, and the thickness that needs only metallic plate is 3.4mm, and 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 section for T-Z=0.6mm, connecting state is good.

In addition, known according to Figure 28, if gap is 2.0mm, though the thickness of metallic plate be 3.4mm also can produce engage bad.

Figure 29 means in embodiment 1, the size of each twin shaft shoulder stirring head dummy instrument and the table of connecting state when the distance between shaft shoulder section is fixed as to 5.8mm.Figure 30 means in embodiment 2, the size of each twin shaft shoulder stirring head dummy instrument and the table of connecting state when the distance between shaft shoulder section is fixed as to 2.8mm.Figure 31 means in reference example, the size of each twin shaft shoulder stirring head dummy instrument and the table of connecting state when the distance between shaft shoulder section is fixed as to 11.5mm.In Figure 29, Figure 30, Figure 31, show tensile resistence/material resistance, fracture resistence force/material resistance, material maintenance trend.

Tensile resistence/material resistance is by Y ²/ (X ²-Y ²) mean.That is to say, the upper surface of the lower surface of the first shaft shoulder section 11 and the second shaft shoulder section 12 is because of the pressing of the metal after being subject to Plastic Flow when friction is stirred, and therefore, tensile stress acts on pin 13.Therefore, tensile resistence/material resistance is used the square value of the external diameter X of the lower surface of the first shaft shoulder section 11 (upper surface of the second shaft shoulder section 12) is deducted to the value (X obtained after the square value of external diameter Y of pin 13 ²-Y ²), and the value of the square value that will sell 13 external diameter Y after divided by value obtained above means.

Fracture resistence force/material resistance is by Y ²/ YZ means.That is to say, when the twin shaft shoulder stirs head dummy instrument 5 docking section N is moved, effect has the power with the axial vertical direction of pin 13.Therefore, the value after divided by the sectional area in the cross section that comprises axle of pin 13 means with the square value that will sell 13 external diameter for fracture resistence force/material resistance.

Material keeps trend by X ²/ Y ²mean.That is to say, when friction is stirred, the metal after Plastic Flow is kept by the upper surface of the lower surface of the first shaft shoulder section 11 and the second shaft shoulder section 12.Therefore, material maintenance trend is used first 11(of shaft shoulder section the second shaft shoulder section 12) the square value of the external diameter X value after divided by the square value of the external diameter Y of pin 13 mean.

After Figure 29, Figure 30, Figure 31 are analyzed, if known material keeps trend (X ²/ Y ²) be that below 2.0, joint defect easily produces, if larger than 2.0, joint defect can not produce.If material keeps trend (X ²/ Y ²) be below 2.0, due to the external diameter Y of pin 13 with respect to first 11(of shaft shoulder section the second shaft shoulder section 12) external diameter excessively thick, therefore, can think that the area of shaft shoulder section that metal is pressed diminishes, thereby, can't to the metal after being stirred by friction, be pressed fully, metal just can produce burr, and overflows from the outside of shaft shoulder section.On the other hand, if material keeps trend (X ²/ Y ²) larger than 2.0, for the external diameter Y of pin 13, first 11(of shaft shoulder section the second shaft shoulder section 12) external diameter X large, therefore, can use the metal after two shaft shoulder sections flow to plastification fully to be pressed.By this, can think that joint defect is not easy to produce.

In addition, after Figure 29, Figure 30, Figure 31 are analyzed, if known tensile resistence/material resistance (Y ²/ (X ²-Y ²)) be below 0.2, pin is easily damaged.This is due to tensile resistence/material resistance (Y ²/ (X ²-Y ²)) be 0.2 when following, pin external diameter Y diminishes with respect to the external diameter X of shaft shoulder section, therefore, can think tensile resistence deficiency with respect to the material resistance produced in the axial direction of when engaging pin, and pin 13 is easily fractureed.If tension stress/material resistance (Y ²/ (X ²-Y ²)) larger than 0.2, can think that the relative shaft shoulder of the pin external diameter Y external diameter X of section becomes large, therefore, sells 13 and is not easy to fracture.

In addition, after Figure 29, Figure 30, Figure 31 are analyzed, if known fracture resistence force/material resistance (Y ²/ YZ) be below 1.2, sell 13 easily breakages.This is due at fracture resistence force/material resistance (Y ²/ YZ) be 1.2 when following, less the external diameter Y of pin distance (length of pin) Z with respect between the shaft shoulder, therefore, can think the fracture resistence force deficiency of when engaging pin mobile material for the direction along contrary with the instrument direct of travel, and pin 13 is easily fractureed.If fracture resistence force/material resistance (Y ²/ YZ) be greater than 1.2, sell the distance of external diameter Y with respect between shaft shoulder section larger (length of pin) Z, therefore, sell 13 and be not easy to fracture.

In addition, after Figure 29, Figure 30, Figure 31 are analyzed, known as tension stress/material resistance (Y ²/ (X ²-Y ²)) be below 0.2, or fracture resistence force/material resistance (Y ²/ YZ) be 1.2 when following, pin can occur damaged.Yet, as tension stress/material resistance (Y ²/ (X ²-Y ²)) be greater than 0.2 and fracture resistence force/material resistance (Y ²/ YZ) be greater than at 1.2 o'clock, pin can be not damaged.Therefore, can obtain as drawn a conclusion: the pin that the twin shaft shoulder stirs the head dummy instrument in order to prevent from engaging occurs damaged, comparatively it is desirable to, the shape of pin is designed to distance (length of the pin) Z between the external diameter X of shaft shoulder section, pin external diameter Y and shaft shoulder section meets with following formula (1), (2) simultaneously.

Y ²/（X ²－Y ²）＞0.2…………（1）

Y ²/YZ＞1.2…………………（2）

In embodiment 3, carve spiral fluted ratio and the spiral fluted direction of rotation of establishing on the pin on twin shaft shoulder stirring head dummy instrument and bring what kind of impact to be investigated on the metallic plate after engaging.With reference to Fig. 7 (a), the direction of rotation of twin shaft shoulder stirring head dummy instrument is set for from the sliding axle side and is viewed as towards right rotation.In addition, the ratio of the lower part helical groove 13b of the top helicla flute 13a of right-hand thread and 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(does not have 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(does not have 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.The twin shaft shoulder stirs the diameter of face in the external diameter X(shaft shoulder section of the first shaft shoulder section 11 of head dummy instrument 5 and the second shaft shoulder section 12, that contact with metallic plate) be set as 20mm, sell 13 external diameter Y and be set as 12mm, be set as 5.8mm apart from Z between shaft shoulder section.The helicla flute degree of depth is set as 0.81mm.The speed setting that the 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 investigated, after space change is 0mm, 1.25mm, 1.50mm, 1.75mm, 2.00mm, tested.

Figure 32 means in embodiment 3, the figure of the impact (gap of docking section is 0mm) that the screw thread ratio is brought the difference of height of metallic plate.Figure 33 means in embodiment 3, the figure of the impact that the screw thread ratio is brought the metallic plate difference of height (gap of docking section is 1.5mm).Difference of height be the surface of the metallic plate before engaging be benchmark (benchmark=0), the height and position at each position after meaning to engage.Difference of height on the occasion of the time mean to be convex, mean to be concavity (groove) during for negative value.

As shown in figure 33, the Re side of the surperficial Sa that uses " ▲ " to mean in condition A～E, all be 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, the Ad side of the surperficial Sa that uses " ◆ " to mean is expressed as very large negative value in condition A.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 mean, 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 the back side Sb that uses " ■ " to mean 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 mean, 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, the Ad side of the Ad side of the surperficial Sa that uses " ◆ " to mean and the back side Sb of use " ■ " expression, in being contrary relation with the ratio of right-hand thread.In addition, the Ad side of the surperficial Sa that uses " ◆ " to mean and use " ■ " are even the Ad side of the back side Sb meaned, under condition C (50:50), also just slightly is concavity.

After Figure 32 and Figure 33 are contrasted, even the gap of known docking section is 1.5mm, while in the gap of docking section, being 0mm, the trend of difference of height does not almost change yet.Can know the Re side of the surperficial Sa that the use " ▲ " of Figure 33 means and compare on the whole little with Figure 32 with the value of the Re side of the back side Sb that uses "●" to mean.

Figure 34 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition A.Figure 35 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition B.Figure 36 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition C.Figure 37 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition D.Figure 38 means in embodiment 3, in the situation that the gap of docking section is different, and the figure in the plastification zone of the metallic plate of condition E.The left hurdle of each figure in Figure 34～Figure 38 has meaned to carry out the cutaway view of micro-structure observation of plastification zone W, and intermediate hurdles mean the top view of surface (decorative cover) the Sa side of plastification zone W, and right hurdle means the top view of the back side Sb side of plastification zone W.

As shown in the left hurdle of Figure 34, in the situation that condition A, on surface, (decorative cover) Sa side is formed with very large groove V, but the Sb side does not form groove V overleaf.When the gap of docking section is 1.75mm, 2.00mm, surperficial Sa side forms joint defect Q.Plastification zone W expands gradually towards back side Sb.The lines of plastification zone W is that left and right is asymmetrical.The lines of the Ad side of plastification zone W is darker than the lines of Re side.In addition, in Figure 34, 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 35, in the situation that condition B, on surface, (decorative cover) Sa side is formed with the groove V less than condition A, but the Sb side does not have groove V overleaf.When the gap of docking section is 2.00mm, in the inside of metallic plate, form joint defect Q.The lines of plastification zone W is that left and right is asymmetrical.The lines of the Ad side of plastification zone W is darker than the lines of Re side.After the back side Sb of the condition A of the back side of the condition B by Figure 43 Sb 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 36, in the situation that condition C, on surface, (decorative cover) Sa side is formed with less groove V, and the Sb side also is formed with less groove V overleaf.When the gap of docking section is 2.00mm, in the inside of metallic plate, form joint defect Q.The upper and lower lines of plastification zone 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 by Figure 36 and Figure 35 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 37, in the situation that condition D, on surface, (decorative cover) Sa side does not form groove V, and the Sb side forms less groove V overleaf.When the gap of docking section is 2.00mm, in the inside of metallic plate, form joint defect Q.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 38, in the situation that condition E, on surface, (decorative cover) Sa side does not form groove V, and the Sb side forms very large groove V overleaf.When the gap of docking section is 1.75mm, 2.00mm, in the inside of metallic plate, form joint defect Q.Plastification zone W narrows down gradually towards back side Sb.Sb produces many burr P overleaf, at surperficial Sa, does not produce burr P.

Figure 39 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 section 12 that makes the 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 the twin shaft shoulder stirs head dummy instrument 5.By this, because the twin shaft shoulder stirs head dummy instrument 5, can enter too far into surface (decorative cover) Sa side, therefore, in surperficial Sa side, form very large groove V.

On the other hand, as shown in the condition B of Figure 39～E, in the situation that being set, the right-hand thread of 25% above ratio partly is used as top helicla flute 13a, the metal that the helicla flute of reason right-hand thread causes moves, will make the twin shaft shoulder stir head dummy instrument 5 and be pressed towards sliding axle 4 sides (top), thereby can prevent that the twin shaft shoulder from stirring the surperficial Sa(decorative cover that the head dummy instrument enters too far into metallic plate).By this, can prevent at surperficial Sa(decorative cover) produce groove V, even or being formed with groove also can reduce the degree of depth of groove.Therefore, can reduce consuming time that the fine finishining level and smooth for the metal sheet surface Sa after making to engage processes.But, when the gap of docking section in condition B, condition C is 2.00mm, and, when the gap of docking section in condition D, condition E is 1.75mm or 2.00mm, owing to having produced joint defect Q, therefore be not suitable for.If can think, this is to cause greatly the cause of the metal material minimizing of bonding part due to the gap of docking section.

In addition, for example, as condition E, when the ratio with 100% is carved the right-hand thread establish towards right rotation, the 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 section 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 section 11 and tabular end 102 in the situation that the gap between the surperficial Sa of friction before stirring is larger, pressing of metal is just abundant not, but in the height and position of the lower surface of the first shaft shoulder section 11 and tabular end 102 in the situation that the gap between the surperficial Sa of friction before stirring is small, can press fully metal.

In addition, in the height and position of the lower surface of the first shaft shoulder section 11 and tabular end 102, in the situation that the gap between the surperficial Sa of friction before stirring is small, the surperficial Sa before plastification zone W only stirs than friction gives prominence to a little.But the processing that becomes level and smooth by the surperficial Sa of tabular end 102 is owing to only need to aliging with the height of the surperficial Sa before stirring that rubs and the part cutting of giving prominence to be got final product, therefore, fine finishining is processed and is become easy.

In above-mentioned embodiment 1, top helicla flute 13a and lower part helical groove 13b are with respect to forming with the ratio of 50:50 apart from Z between shaft shoulder section, but decorative cover is being made as to surperficial Sa, and make the twin shaft shoulder stir head dummy instrument 5 in the situation of right rotation, comparatively it is desirable to, make the lower part helical groove 13b of left-hand thread of the top helicla flute 13a of right-hand thread of the first shaft shoulder section 11 sides and the second shaft shoulder section 12 sides with respect to forming with the ratio of 25:75～100:0 apart from Z between shaft shoulder section.That is to say, also the top helicla flute 13a of right-hand thread can be formed in the first shaft shoulder section 11 sides with respect to the Z-shaped part become 25% or more of distance between shaft shoulder section, and using top helicla flute 13a part in addition all as the lower part helical groove 13b of left-hand thread.In the situation that make the twin shaft shoulder stir head dummy instrument 5 towards right rotation, also left-hand thread can be set, and on the axial total length of pin 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 39, by the direction of rotation, the spiral fluted coiling direction that the twin shaft shoulder are stirred to head dummy instrument 5, according to condition A, B, C, D, set, by this, can prevent back side Sb(decorative cover) side generation groove V, even or being formed with groove V also can reduce the degree of depth of groove V.

That is to say, in the situation that make the twin shaft shoulder stir head dummy instrument 5, in right rotation, rear side Sb is set as to decorative cover, comparatively it is desirable to, comprising: the docking operation, in this docking operation, docks the end face of metallic plate each other; And joint operation, at this, engage in operation, making, the second shaft shoulder section 12 is relative with the decorative cover of metallic plate, and the axial centre that makes pin 13 is with after the thickness of slab direction center of metallic plate is aimed at, make the pin 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, by being set as below the thickness of slab of metallic plate apart from Z between shaft shoulder section, and the second shaft shoulder section 12 sides at the outer peripheral face of pin 13 form the helicla flute of left-hand threads, and the helicla flute that makes above-mentioned left-hand thread is with respect to forming with the ratio more than 25% apart from Z between shaft shoulder section.

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

Figure 40 is the figure after the situation while making the twin shaft shoulder stir the 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(does not have 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(does not have right-hand thread).

As shown in Embodiment 2, towards anticlockwise the time, 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.When making the twin shaft shoulder stir head dummy instrument 5A towards anticlockwise, the coiling direction of screw thread that stirs head dummy instrument 5 due to the twin shaft shoulder from embodiment 1 is different, therefore, can show the action effect identical with embodiment 3 on result.That is to say, as shown in condition G～condition J, because the metal after friction stirring liquidation can be by after the top helicla flute 13a of the left-hand thread of pin 13 guiding, towards the first shaft shoulder section 11 side shiftings, and by after the top helicla flute 13b of the right-hand thread of pin 13 guiding, towards the second shaft shoulder section 12 side shiftings.Because left-hand thread forms with the ratio more than 25%, therefore, the metal that the helicla flute of reason left-hand thread causes moves, make the twin shaft shoulder stir head dummy instrument 5A and pressed towards sliding axle 4 sides (top), thereby can prevent that the twin shaft shoulder from stirring surface (decorative cover) Sa that head dummy instrument 5A enters too far into metallic plate.By this, can prevent from producing groove V at surface (decorative cover) Sa, even or being formed with groove V also can reduce the degree of depth of groove V.By this, can reduce consuming time that fine finishining that the surperficial Sa for the metallic plate after making to engage becomes level and smooth processes.

In addition, for example, as condition J, when the ratio with 100% is carved the left-hand thread establish towards anticlockwise, the 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 section 11 is positioned at tabular end 102 above the surperficial Sa rubbed before stirring, in the height and position of the lower surface of the first shaft shoulder section 11 and tabular end 102 in the situation that the gap between the surperficial Sa of friction before stirring 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 section 11 and tabular end 102 in the situation that the gap between the surperficial Sa of friction before stirring is small, just can to metal, be pressed fully.

In the height and position of the lower surface of the first shaft shoulder section 11 and tabular end 102, in the situation that the gap between the surperficial Sa of friction before stirring is small, the surperficial Sa before plastification zone W only stirs than friction gives prominence to a little.But the processing that becomes level and smooth by the surperficial Sa of tabular end 102 is owing to only need to aliging with the height of the surperficial Sa before stirring that rubs and the part cutting of giving prominence to be got final product, therefore, fine finishining is processed and is become easy.

In above-mentioned embodiment 2, top helicla flute 13a and lower part helical groove 13b are with respect to forming with the ratio of 50:50 apart from Z between shaft shoulder section, but decorative cover is being made as to surperficial Sa, and make the 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 section 11 sides and the right-hand thread of the second shaft shoulder section 12 sides is with respect to forming with the ratio of 25:75～100:0 apart from Z between shaft shoulder section.That is to say, also left-hand thread top helicla flute 13a can be formed in the first shaft shoulder section 11 sides, with respect to the Z-shaped part become more than 25% of distance between shaft shoulder section, 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 make the twin shaft shoulder stir head dummy instrument 5 towards anticlockwise, also right-hand thread can be set, in the axial whole total length of pin 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 40, by direction of rotation, according to condition F, G, H, the I setting of spiral fluted coiling direction of the twin shaft shoulder being stirred to head dummy instrument 5, by this, can prevent Sb(decorative cover overleaf) side generation groove V, even or being formed with groove V also can reduce the degree of depth of groove V.

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

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

Then, embodiments of the invention 4 are described.Figure 41 means the front view of engaging form or the docking form of embodiment 4, and wherein, Figure 41 (a) means type I, and Figure 41 (b) means Type II, and Figure 41 (c) means 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 consisted of aluminium alloy 6N01-T5 material, 201B, with reference to Figure 12 and Figure 41, 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 section 213 of covering section, 223, 232, 242) thickness b=0.5mm, reach the length c=15mm from support plate 204 to second end faces 43 from the length c of support plate 204 to first end faces 33, 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 15, the twin shaft shoulder stirs head dummy instrument 265 and sets the external diameter Y1=15mm of the diameter Y2=10mm of the upper surface 253c of the diameter X2=10mm of the lower surface 252c that makes the first shaft shoulder section 252, the second shaft shoulder section 253, the second shaft shoulder section 253 for, sells 254 external diameter U=6mm.Be set as 2.9mm from the length of the first 252 to second shaft shoulder sections 253 of shaft shoulder section (sell 254 length).The shape of depressed part (not shown) that is formed at the lower surface 252c of the first shaft shoulder section 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.The 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 41 (a)～Figure 41 (c).The speed setting that the 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 41 (a), stir the left side configuration double face slab 201A of the direct of travel of head dummy instrument 265 at the 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 41 (b), stir the right side configuration double face slab 201A of the direct of travel of head dummy instrument 265 at the 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 41 (c), stir the left side configuration double face slab 201A of the direct of travel of head dummy instrument 265 at the 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 42 means the figure of the angular deformation result of type I.Figure 43 means the figure of the angular deformation result of Type II.Figure 44 means the figure of the angular deformation result of type-iii.Transverse axis means the length on width of engaged each body to be tested apart from left-hand end.Width=200mm means the position of center line C.The longitudinal axis mean each body to be tested apart from datum mark arbitrarily, engage after height.The height everywhere apart from for 50mm, 200mm, 400mm, 600mm, 800mm, 950mm apart from front end towards bearing of trend to each body to be tested is calculated.

As shown in Figure 42,43, 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, in the position from 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 think that this is due to as shown in Figure 41 (a) and Figure 41 (b),

double face slab

201A, 201B are subject to engaging form difference caused that the twin shaft shoulder stirs the force direction of head dummy instrument 265 and double face slab 201A, 201B.The helicla flute 255 that can expect stirring at the twin shaft shoulder that makes present embodiment head dummy instrument 265(pin 254 is left-hand thread) towards right rotation, and while moving toward rear side from the paper outside of Figure 41, effect has stress F1.

Therefore, if the Type II shown in Figure 41 (b), due to the incline direction of the inclined plane Ma of holding section M and the action direction almost parallel of stress F1, and stress F1 is positioned at the same side with respect to input position and the inclined plane Ma of center line C, therefore, easily towards the right side, tiltedly below is mobile for double face slab 201B, thereby the possibility that in making to engage,

double face slab

201A, 201B divide out improves.

On the other hand, if the type I shown in Figure 41 (a), due to the incline direction of the inclined plane Ma of holding section M and the action direction of stress F1, intersect, and stress F1 is positioned at opposition side with respect to input position and the inclined plane Ma of center line C, therefore, can effectively prevent that in joint,

double face slab

201A, 201B divide out.

In addition, as shown in figure 44, 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, with the left and right end, compare, bonding part is the highest, from top view, is the mountain type.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 integral body 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 the angular deformation amount, comparatively it is desirable to, first from holding section M side, rub and stir joint.

Figure 45 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 45, show the optimum condition 1～4 of Four types.As condition 1(and present embodiment with) as shown in, make the twin shaft shoulder that helicla flute is left-hand thread stir head dummy instrument 265 towards right rotation, and situation about moving towards rear side from the paper outside of Figure 45, the preferred Selective type I of engaging form.

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

double face slab

201A, 201B divide out.

In addition, as shown in condition 2, make the twin shaft shoulder that helicla flute is right-hand thread stir head dummy instrument 265 towards anticlockwise, and situation about moving towards rear side from the paper outside of Figure 45, the preferred Selective type II of engaging form.

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

double face slab

201A, 201B divide out.

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

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

In addition, in condition 1, condition 2, comparatively it is desirable to, in the first shaft shoulder section 252 sides, covering section is set, in

condition

3,4, comparatively it is desirable to, in the second shaft shoulder section 253 sides, covering section is set.By this, metal can be added to because of friction and stir a side that makes the metal deficiency, therefore, can supplement the metal deficiency.

At embodiment 5, with five double face slabs with embodiment 4 different sizes, rubbing to stir engages.If with reference to Figure 12, the double face slab of embodiment 5 is set the thickness of slab a=4.0mm, thickness b=0.5mm, the left and right width dimensions e=400mm of covering section, the prolongation that make outside heavy section for and is of a size of 12500mm.

If with reference to Figure 15, the twin shaft shoulder stir diameter X2=15mm that the head dummy tool settings becomes to make the lower surface 252c of the first shaft shoulder section 252, the second shaft shoulder section 253 external diameter Y1=18mm, the second shaft shoulder section 253 upper surface 253c diameter Y2=15mm, sell 254 external diameter U=9mm.Be set as 3.7mm from the length of the first 252 to second shaft shoulder sections 253 of shaft shoulder section (sell 254 length).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 the twin shaft shoulder is stirred to the head dummy instrument is set in holding section M side, in docking section N side, be 1500mm/min.

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, engaged and docked.After by identical operation, five double face slabs seamlessly being engaged, fixing assembly can not move freely it.And use with the 1.5m arranged spaced the horizontal pressing tongs on extending direction to be pressed, so that assembly can not float.In addition, four corners of assembly are clamped simply.Then, rub successively and stir joint since an end.

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

This is, after stir engaging owing to rubbing in the effects on surface side, because the thermal contraction meeting makes hardware, in face side, to form concavity, 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, if rear side is rubbed to stir, engage, just by friction, stir the heat produced, be not easy to dissipate to desktop, therefore, heat residual on hardware is increased.Consequently, due to the acting in conjunction of the heat that residues in 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 the head dummy instrument and move degree of hastening and set that to move degree of hastening than the twin shaft shoulder of holding section M stirring head dummy instrument fast for, enter the heat of docking section in the time of just preventing from engaging.By this, the double face slab warpage after can preventing from engaging.

In embodiment 6, for the thickness of slab to tabular end and the relation between length are investigated and tested.As shown in Figure 46 (a), two cross sections are to identical shaped body to be tested 301,301 docking of コ word shape, and docking section N is rubbed and stirs joint.Each body 301 to be tested comprises supporting member 302, vertically extends the tabular end 303 of setting from supporting member.

The height setting of body 301 to be tested is 30mm, extends size and is set as 500mm.As shown in Figure 46 (a), Figure 46 (b), using the length c of the thickness of slab a of tabular end 303 and the front end from supporting member 302 to tabular end 303 as parameter, under each condition, rubbing to stir engages.In Figure 46 (b), each condition and the bond quality of embodiment 6 are aggregated into to table.The twin shaft shoulder stirs the size of head dummy instrument as shown in the table of Figure 46 (b).

As shown in Figure 46 (b), when 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, in the situation that thickness of slab a=6mm, when length c=70mm, 80mm can produce engage bad.In the situation that thickness of slab a=12mm can produce joint bad when length c=120mm.That is to say, if the length of tabular end 303 is long with respect to supporting member 302, the front of tabular end 303 easily is out of shape, and therefore easily causes engaging bad.

Figure 47 means the figure of the dependency relation of embodiment 6.The transverse axis of Figure 47 means thickness of slab a, and the longitudinal axis means the length c of the front end from supporting member 302 to tabular end 303.From this figure, comparatively it is desirable to, the length c from the supporting member to the front end is set for to the condition that meets c≤7.0 * thickness of slab a+18.5mm.As long as under this condition, just can suppress the distortion of tabular end 303, therefore, be not easy to produce joint bad.

(symbol description)

1 friction agitating device

1a chuck section

2 throw unit

3 keepers

4 sliding axles

5 twin shaft shoulders stir the head dummy instrument

6 sliding members

11 first shaft shoulder sections

12 second shaft shoulder sections

13 pins

13a top helicla flute

The 13b lower part helical groove

The 100A hollow material

The 100B hollow material

The N docking section

The thickness of T metallic plate

W plastification zone (junction surface)

The external diameter of X shaft shoulder section

The external diameter of Y pin

Distance between Z shaft shoulder section (length of pin)

Claims

1. a throw unit, stir and engage for rubbing, and it is characterized in that having:

Keeper cylindraceous, this keeper is fixed in the chuck section of friction agitating device;

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

The twin shaft shoulder stirs the head dummy instrument, and this twin shaft shoulder stirring head dummy instrument reaches by the first shaft shoulder section, the second shaft shoulder section pin formed between described the first shaft shoulder section and described the second shaft shoulder section and forms,

Front end at described sliding axle is fixed with described the first shaft shoulder section,

Comprise sliding members between described keeper and described sliding axle, thereby described sliding axle is slided vertically with respect to described keeper.

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

Described sliding members consists of the bearing groove on the inner surface of the outer surface that is formed on described sliding axle or described keeper and the ball bearing that slides in bearing groove.

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

There is the key formed on the keyway that forms on any one party in described keeper and described sliding axle and the opposing party in described keeper and described sliding axle,

Described key is accompanied by the movement of described sliding axle and moves in the inside of described keyway.

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

Extending axially of any one party in the outer surface of the inner surface of described keeper and described sliding axle is provided with raised line, and the extending axially of the opposing party in the outer surface of the inner surface of described keeper and described sliding axle is provided with recessed,

Described raised line is accompanied by the movement of described sliding axle and moves the inside of described recessed.

5. a friction stirring connecting method, right to use requires 1 described throw unit, and the pair of metal plate is engaged, and it is characterized in that, and described friction stirring connecting method comprises:

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

Engage operation, engage in operation at this, make the pin of the described twin shaft shoulder stirring head dummy instrument of rotation move to the docking section of described end face being docked each other to rear formation, described end face is rubbed to stir each other to be engaged,

In described joint operation, in advance the distance between described the first shaft shoulder section and described the second shaft shoulder section is set as below the thickness of described metallic plate, make described metallic plate distortion when stirring because of friction, when head dummy instrument axially displaced stirred along described twin shaft shoulder in the position that makes described metallic plate, described twin shaft shoulder stirs the head dummy instrument along with the displacement of described metallic plate is moved vertically.

6. friction stirring connecting method as claimed in claim 5, is characterized in that,

By described end face, gap to each other is set as 1.00mm when following,

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

7. friction stirring connecting method as claimed in claim 5, is characterized in that,

By described end face, gap to each other is set as being greater than 1.00mm and for 1.75mm when following,

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

8. friction stirring connecting method as claimed in claim 5, is characterized in that,

The value of the square value of setting the external diameter that makes the described shaft shoulder for after divided by the square value of the external diameter of described pin is greater than 2.0.

9. friction stirring connecting method as claimed in claim 5, is characterized in that,

Set for the square value of the external diameter of pin is deducted to the value obtained after the square value of external diameter of described pin, and the value of the square value of external diameter that makes described pin after divided by the described value obtained be greater than 0.2, and make the square value of the external diameter of described pin divided by the external diameter of described pin, take advantage of the value after the value of the distance between described shaft shoulder section to be greater than 1.2.

10. friction stirring connecting method as claimed in claim 5, is characterized in that,

In described joint operation, in the situation that the thickness of the described metallic plate of the part after docking is different, when the direct of travel that stirs the head dummy instrument with respect to described twin shaft shoulder when the larger described metallic plate of the thickness by described metallic plate is configured in left side, make described twin shaft shoulder stir the head dummy instrument towards right rotation.

11. friction stirring connecting method as claimed in claim 5, is characterized in that,

In described joint operation, in the situation that the thickness of the described metallic plate of the part after docking is different, when the direct of travel that stirs the head dummy instrument with respect to described twin shaft shoulder when the larger described metallic plate of the thickness by described metallic plate is configured in right side, make described twin shaft shoulder stir the head dummy instrument towards anticlockwise.

12. friction stirring connecting method as claimed in claim 5, is characterized in that,

In described joint operation,

Making, described the first shaft shoulder section is relative with the decorative cover of described metallic plate, and the axial centre that makes described pin is with after the center of the thickness of slab direction of described metallic plate is aimed at, make from described sliding axle side be viewed as the pin that stirs the 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 right-hand thread in described first shaft shoulder section side of the outer peripheral face of described pin, the helicla flute of described right-hand thread forms with the ratio more than 25% with respect to the distance between described the first shaft shoulder section and described the second shaft shoulder section.

13. friction stirring connecting method 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 section, be formed with the helicla flute of left-hand thread.

14. friction stirring connecting method as claimed in claim 5, is characterized in that,

In described joint operation,

Making, described the first shaft shoulder section is relative with the decorative cover of described metallic plate, and the axial centre that makes described pin is with after the center of the thickness of slab direction of described metallic plate is aimed at, make from described sliding axle side be viewed as the pin that stirs the head dummy instrument towards the described twin shaft shoulder of anticlockwise 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 described first shaft shoulder section side of the outer peripheral face of described pin, the helicla flute of described left-hand thread forms with the ratio more than 25% with respect to the distance between described shaft shoulder section.

15. friction stirring connecting method 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 section, be formed with the helicla flute of right-hand thread.

16. friction stirring connecting method as claimed in claim 5, is characterized in that,

In described joint operation,

Making, described the second shaft shoulder section is relative with the decorative cover of described metallic plate, and the axial centre that makes described pin is with after the center of the thickness of slab direction of described metallic plate is aimed at, make from described sliding axle side be viewed as the pin that stirs the 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 described second shaft shoulder section side of the outer peripheral face of described pin, the helicla flute of described left-hand thread forms with the ratio more than 25% with respect to the distance between described shaft shoulder section.

17. friction stirring connecting method 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 section, be formed with the helicla flute of right-hand thread.

18. friction stirring connecting method as claimed in claim 5, is characterized in that,

In described joint operation,

Making, described the second shaft shoulder section is relative with the decorative cover of described metallic plate, and the axial centre that makes described pin is with after the center of the thickness of slab direction of described metallic plate is aimed at, make from described sliding axle side be viewed as the pin that stirs the head dummy instrument towards the described twin shaft shoulder of anticlockwise move to described end face is docked each other the docking section of formation

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

19. friction stirring connecting method 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 section, be formed with the helicla flute of left-hand thread.

20. as claim 12,14,16 or 18 described friction stirring connecting methods, it is characterized in that,

In described joint operation, at the decorative cover to described metallic plate, carry out in cooling being engaged.

21. the assembly of a double face slab, it is that right to use requires 1 described throw unit, and a pair of double face slab is rubbed after stir engaging and to form, it is characterized in that,

The hook portion that makes to be formed on the end of hook portion on a side the end of outside plate of described double face slab and the outside plate of the described double face slab that is formed on the opposing party engages,

The end face be formed on a side the end of inner panel of described double face slab is docked with the end face of the inner panel of the opposing party's described double face slab, and do not engage.

22. the assembly of double face slab as claimed in claim 21, is characterized in that,

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

A pair of described extension is engaged with each other.

23. the assembly of double face slab 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,

Described heavy section at the opposing party's described double face slab is formed with and described heavy wall inclined plane of stretching out the inclination plane-plane contact.

24. the assembly of double face slab as claimed in claim 21, is characterized in that,

Be folded with support plate between described outside plate and described inner panel,

By the length setting from described support plate to described end face, be c(mm), and the thickness of slab of described heavy section is set as to t(mm) time,

Meet c≤7.0 * t+18.5mm.

25. the friction stirring connecting method of a double face slab, right to use requires 1 described throw unit, and the end of a pair of double face slab is rubbed to stir each other to be engaged, and it is characterized in that, comprising:

Preparatory process, in this preparatory process, the hook portion be formed on the end of hook portion on a side the end of outside plate of described double face slab and the outside plate of the described double face slab that is formed on the opposing party is engaged, and the end face that will be formed on a side the end of inner panel of described double face slab docks with the end face of the inner panel of the opposing party's described double face slab, and does not engage; And

Engage operation, engage in operation at this, the docking section after the holding section after engaging in described preparatory process and docking is rubbed to stir to be engaged.

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

In described joint operation, after described holding section is engaged, more described docking section is engaged.