CN103796773B - The method engaging AA7000-series aluminium alloy sheet - Google Patents

Abstract

The method that the present invention relates to manufacture joint (D) in the metal works overlapping at least two (1,1'), described method uses joint instrument to obtain mechanical splice between overlapping workpiece, especially by being folded mechanically or the mode engaged of pressurizeing engages；And wherein, described first workpiece (1) and second workpiece (1') at least one sheet material being made up of AA7000 series alloys；And wherein, in before manufacturing joint 120 minutes and/or in manufacturing at least part of time during joint, the at least workpiece to described 7000 series sheet materials carries out heat treatment, thus temporarily reduces the hot strength of the most described 7000 series sheet material material work piece engaging zones.

Description

The method engaging AA7000-series aluminium alloy sheet

Technical field

The present invention relates to the method for being bonded together by assembly, more particularly it relates to by such as crimping (hemming) AA7000-series aluminium alloy sheet is connect by the technology, clamping (clinching) and riveting (riveting) Close.

Background technology

Hereinafter will be seen that, except as otherwise noted, the aluminium alloy trade mark and state code (temper Designations) Aluminum published in 2011 is referred to by association of Alcoa (Aluminum Association) Aluminum Association in Standards and Data and the Registration Records Designations, it is known to those skilled in the art.

For any description of alloy composition or preferred alloy composition, except as otherwise noted, all mention percentage ratio Part is all referring to percentage by weight.Term as used herein " at most " (up to) and " at most about " (up to about) are clear and definite Include but not limited to the probability that percentage by weight is zero of involved particular alloy component.Such as, the Ti of at most about 0.2% The alloy without Ti can be included.

Self-piercing riveting (" SPR ") is the effective technology being bonded together by assembly (such as sheet metal).From punching Rivet generally comprises the cylindrical shank (shank) of head and part hollow, and described shank ends up with the punching edge of annular, and It is inserted in one or more sheet material.

With the drift of installation tool by rivet chisel (driven) in sheet material so that shank passes upper layer of sheet material, and Supported by mould while being flared out.Rivet, the ring of turned up by material (upset) is inserted in the case of incomplete penetration The rivet end making deformation keeps sealing, and is consequently formed mechanical interlock.Self-piercing riveting makes sheet material engage, and without Prebored hole or pre-punched hole is carried out on material.

Self-punching riveting technology has been applied to many manufacturings, but particularly successful in automobile industry, and automobile industry tends to Weight is used not reduce the material of safety.SPR has been used for engaging the car body of the assembly being difficult to be spot welded, such as aluminum Panel.Having turned out SPR technique is successful in this case, is not only due to them and has manufactured the most real Existing automatization, there is the joint of good strength and anti-fatigue performance, also as due to sheet material upper surface around rivet Deform hardly so that described joint is acceptable aesthetically.

Want to use this technology manufacture (especially when the height using such as those AA7000-series alloys in manufacturer When intensity aluminum series alloy manufactures) joint categories aspect, riveting (particularly SPR) is faced with increasing challenge.

Summary of the invention

It is an object of the present invention to provide the joint method of the improvement that can apply to high-strength aluminum alloy sheet material.

The machinery that it is a further object to provide the improvement that can apply to high-strength aluminum alloy sheet material connects Conjunction method.

The present invention reaches or has surmounted these and other objects and further advantage, and provides for extremely The method manufacturing joint in few two overlapping metal works, described method uses joint instrument, especially by local mechanical Fold (such as, crimping or bending) or by the way of pressurization engages (pressure-joining) (such as rivet or clamp), Between overlapping workpiece, obtain mechanical splice, and wherein, at least one in the first workpiece and second workpiece be by The sheet material that AA7000-series alloys is made, wherein, in 120 minutes before manufacturing joint and/or at manufacture joint In at least part of time of period, at least the workpiece of described 7000-series sheet material is applied heat treatment, thus temporarily reduce The hot strength of the engaging zones of the most described 7000-series sheet material material work piece.

The heat treatment (at least in engaging zones) temporarily reducing 7000-series sheet material tensile strength of material can engage Operation (such as, by crimping, clamp or rivet by the way of engage) before carry out, described heat treatment is by whole 7000-system Row sheet material carries out heat treatment or by least straight than rivet to specific region (such as, flange) to be joined or diameter The slightly larger border circular areas in footpath carries out heat treatment and carries out.Described heat treatment can also be in the beginning of bonding operation, by engaging Region carries out local heat treatmet and implements, and can implement as a part for bonding operation itself.

Heat treatment is implemented the most in the following manner: at least engaging zones at 7000-series sheet material stands about 100 DEG C Heat treatment to about 350 DEG C of temperature ranges.Preferably lower limit is about 140 DEG C or 160 DEG C.The preferred upper limit of temperature is about 250 DEG C, even more preferably about 230 DEG C.Most preferably scope is 175 DEG C to 220 DEG C, such as 195 DEG C.

Heat treatment within the temperature range of limiting preferably is carried out no more than about 60 seconds altogether, is the most altogether less than About 30 seconds, more preferably carry out no more than about 20 seconds or 12 seconds altogether, e.g., from about 2 seconds or about 5 seconds.Minimum hold time to temperature The shortest, such as 0.01 second, preferably from about 1 second or 2 seconds, so that it is guaranteed that sheet material has reached target heat-treatment temperature.

In a preferred embodiment, the heat time heating time reaching heat treatment temperature is 0.5 second to 10 seconds, and preferably 1 second to 5 Second.

Different from the heat treatment of prior art (heat treatment as disclosed in WO98/50595A1), at the heat of the present invention Manage without carrying out forcing cooling or hardening step (such as water quenching) at the end of heat treatment, thus (temporarily) reduces hot strength Or guarantee final strength.It is not precluded from such operation at present, but preferably without forcing the process of cooling.Sheet material after heat treatment Material at most can stand air injection, but in most cases, is sufficient to by surrounding air cooling.Real at some Executing in mode, when manufacturing mechanical splice, described workpiece is still within the temperature raised, such as more than 80 DEG C.

In embodiments of the present invention, the metal works that described method is applied to two overlapping is engaged by pressurization Mode engage, to obtain joint.Particularly two kinds pressurization joining techniques are very important for the present invention.

In an important embodiment, it is to realize by the way of clamping that described pressurization engages.Clamp and relate to leading to Cross the locally-shaped method that metal sheet is combined of material, and between two-layer or multilayer material, produce interlocking joint. According to the joint instrument used, the obtained joint that clamps can be circular or rectangle.Circular clamps joint, and Material is not carried out pre-cut.The enterprising trip temperature of engaging zones at least one 7000-series metal sheet material is less than 350 DEG C Heat treatment after at most 120 minutes in or while carrying out heat treatment, can be formed and clamp joint.

Generally, clamping joint is to be formed due to mould and the interaction of drift.

In another important embodiment of the present invention, pressurization is engaged and is realized by machanical fastener, particularly Ground realizes by using rivet.

The method of the present invention can also use recently exploitation, will clamp and rivet the joining technique combined.In moral In language, this technology is also referred to as " Nietclinchen ".

In another embodiment of the inventive method, described method uses and is folded mechanically (particularly bending or crimping) So that the metal works that at least two is overlapping is engaged.Crimping is technology well known in the art, and this technology is by by sheet material material One workpiece on another workpiece (or around another workpiece) of material carries out plasticity folding and is formed and be essentially straight line The joint of shape, to set up fixing seam (immovable seam).

Each item (particularly riveting) in these joining techniques can also combine with cementation.

It has been found in accordance with this invention that described method can manufacture mechanical splice, described mechanical splice comprises at least one The workpiece be made up of 7000-series material also provides flawless joint.Meanwhile, significantly reduce by the way of pressurization engages (such as, clamp or rivet) is to form the power needed for described mechanical splice.Another advantage has been to provide flawless clamping and has connect Head or riveted joint, before bonding operation, described joint have unrelated with the natural aging time of 7000-series material can The degree of depth reappeared.Additionally, improve the intensity of joint.

When manufacturing (such as at OEM) at industrial scale, due to the restriction in logistics, it is impossible to guarantee to comprise 7000- At least one component of series material or the assembly of workpiece (carrying out deep-draw in the W degree of temper (through solution heat treatment, quenching) to pull out) Engage in limited or predefined narrow time range.Direct result is, the different component of 7000-series material or work Part may experienced by the different natrual ageing persistent period, therefore will have different intensity and ductility level.For Natrual ageing is more than several 7000-series alloys in 2 to 3 weeks, and ductility significantly reduces.Therefore, manufacture in sheet material Flawless mechanical splice (such as pass through crimping, clamp or rivet) becomes extremely difficult.To connect additionally, due to be difficult to follow the trail of " degree of aging " of the single 7000-list of elements closed, it may occur however that when will have different natrual ageing level or different nature Two parts or the workpiece of effect history engage, as a consequence it is hardly possible to be known a priori by during engaging using which kind of power Measure the pressurization to reach to have desired and reproducible penetration depth and engage (such as clamp or the joint of riveting).

Have been found that as defined in the range of and in preferred narrower range, carry out heat treatment, temporarily reduce The yield strength of AA7000-series alloy material, and add ductility accordingly.This reduction is substantially independent of it at root Carry out the amount of the natrual ageing accepted before heat treatment according to the present invention, and again bring for it gratifying, reproducible And relatively low level, as it is had in time of at most 60 minutes after standing solution heat treatment and quenching Level.

As result so that engage (especially by clamping or riveting) period at crimping or pressurization, by AA7000-series Material carries out engaging and being formed without crackle.Additionally, arrange (such as strength) aspect at joint quality (the such as degree of depth) and joint, make Can carry out consistent, reproducible clamping and riveting practice.Meanwhile, by reducing AA7000-series material in bonding land Yield strength in territory, produces the residual stress of reduced levels in the material by bonding operation.Therefore, prevent or at least push away The generation of delayed fracture late.

It is moreover found that be in T4 state the identical AA7000-series material carrying out that identical artificial aging processes Material is compared, and the method for the present invention is to processing the AA7000-series material after (such as baking vanish process) standing artificial aging Final strength performance have a negative impact.For some embodiments have been found that for according to the present invention, especially by Clamping or rivet the mechanical splice made, compared with T4 sheet material, its tear strength, especially peel strength are increased.

Only certain exemplary embodiments of this invention relates to the method manufacturing joint in the metal works that at least two is overlapping, Described method uses the joint instrument containing drift to be inserted in workpiece to form joint by rivet (more preferably self-punching rivet), institute Stating workpiece and have the first surface closest to instrument, described method includes being placed between instrument and mould workpiece, and by rivet It is positioned between drift and first surface, inserts rivets in the workpiece that at least two is overlapping with drift so that described first Surface is pierced through by rivet；And wherein, at least one in described first workpiece and second workpiece is to be closed by AA7000-series aluminum The sheet material that gold is made；And wherein, at least portion in 120 minutes before manufacturing joint and/or during manufacture joint In between timesharing, at least workpiece to described 7000-series sheet material applies heat treatment, thus temporarily reduces at least described Hot strength in the engaging zones of 7000-series sheet material material work piece.

In using the embodiment of method of riveting, described drift can apply compression stress during rivet inserts, from And make workpiece be deformed into joint at the engaging zones between instrument and mould.

In using the embodiment of method of riveting, being engaged by the workpiece that at least two is overlapping, described workpiece can Including the first workpiece closest to drift and the second workpiece closest to mould.May deposit between the first workpiece and second workpiece In one or more intermediate piece.At least pierceable the first workpiece closest to drift of rivet, it is also possible to pierce through one or many Individual intermediate piece.Rivet is preferably inserted into workpiece incomplete penetration (that is, not piercing through bottom workpieces) so that described rivet becomes The ring part still turned up by material in the end of shape is encapsulated.

Described rivet can have head and shank, and it can be hollow or part hollow.Or, can use and have or not There is solid slug (solid slug) form of head.May be used without the same riveted joint of binding agent or clamp the combination of joint.

Various mode of heating well known by persons skilled in the art can be utilized at least to make by AA7000-series alloys Workpiece carry out heat treatment at engaging zones, described mode of heating includes but not limited to sensing heating, contact heating, ultrasound wave adds Heat and infrared heating.

Heat treatment can apply to whole workpiece, or is preferably only applied to specific region to be joined, described given zone Territory can be the diameter border circular areas more slightly larger than the diameter of rivet or flange region.Feelings are engaged in the pressurization such as riveting and clamping Under condition, preferably heat treatment is applied topically to the least region.This can realize by such as sensing heating.Certainly, exist Before workpiece is transferred to joint instrument, can sequentially or simultaneously these type of regional areas several on a workpiece be carried out at heat Reason.

At the finite region of aluminum sheet, only carry out heat treatment there is the beneficial effect without forcing cooling.Owing to aluminum has Good heat conductivity, in this finite region, produced heat flows into neighboring area in finite time, it is ensured that heating region is non- Often lower the temperature soon, it is ensured that alloying element does not has time enough to flow out from solid solution.Therefore, final strength is not had by heat treatment Negative effect or the most inappreciable negative effect.

Or, if using contact heating, optionally workpiece can will will be made the part of joint (outside usually Edge) contact with hot plate, thus carry out local heat treatmet.

Heat treatment can be only applied to a workpiece, or applies simultaneously to each in the workpiece of overlap.

The most important aspect is: at least one described workpiece is AA7xxx-series alloys Sheet material.

In yet another embodiment of the present invention, a workpiece is by AA7000-series aluminium alloy sheet material manufacture , and other workpiece is also made up of aluminum alloy sheet material.Other workpiece described preferably by selected from AA5000, The aluminium alloy of the group of AA6000 or AA7000-series alloys is made.

In yet another embodiment of the present invention, a workpiece is made up of AA7xxx-series aluminium alloy sheet material , and other workpiece is made up of blank steel plate or by having one or more clad and/or one or more coating Steel plate is made.

For the first assembly and the second assembly, the method for the present invention can be applicable to AA7000-series alloy widely.? In preferred embodiment, described aluminium alloy selected from AA7021, AA7136, AA7050, AA7055, AA7150, AA7075, AA7081, AA7181, AA7085, AA7185 and the group of their modification.

Another preferred embodiment in, described AA7000-series alloy comprises in terms of wt%:

Zn 3.8 to 8.2, preferably 5.0 to 7.0, most preferably 5.5 to 6.5；

Mg 1.5 to 2.3, preferably 1.5 to 2.1；

Cu 0 to 0.45, preferably 0 to 0.3；

Zr 0.04 to 0.25；

Optionally, the element during one or both are selected from the group that following elements is formed: Mn0.05 to 0.5, Cr0.05 To 0.5, Ti0 to 0.15, Fe0 to 0.35, Si0 to 0.25；

Other element and inevitable impurity, the most up to 0.05%, total amount is up to 0.20%；

The aluminum of surplus.

In another embodiment, described AA7000-series alloy comprises in terms of wt%:

Zn 3.8 to 8.2, preferably 5.0 to 7.0, most preferably 5.5 to 6.5；

Mg 1.5 to 2.3, preferably 1.5 to 2.1；

Cu 0.6 to 2.4, preferably 1.2 to 2.4；

Zr 0.04 to 0.25；

Optionally, the element during one or both are selected from the group that following elements is formed: Mn0.05 to 0.5, Cr0.05 To 0.5, Ti is most 0.15, Fe is most 0.35, Si most 0.25；

Other element and inevitable impurity, the most up to 0.05%, total amount is up to 0.20%；

The aluminum of surplus.

Preferably, the specification of AA7000-series aluminium alloy sheet assembly is about 0.5mm to 4mm, preferably from about 0.7mm extremely 3.5mm。

In embodiments, it is provided that in its at least side, there is the AA7000-series aluminium alloy sheet of metal carbonyl coat Assembly, wherein, described metallic cover layer material has inner surface and an outer surface, and wherein, and described inner surface is towards AA7000- Series material.

Clad generally ratio core sheet much thinner, and each clad constitute total composite sheet thickness about 1% to 25%.More typically, clad constitutes about the 1% to 14% of total composite sheet thickness.

Coating layer material can by AA3000, AA4000-, AA5000-, AA6000-or be different from core alloy AA7000-series alloys is made.The representative instance of this kind of clad be the alloy with following chemical composition: AA3004, AA3005、AA6016、AA6016A、AA6005、AA6005A、AA5005、AA5005A、AA5754、AA5051A、AA5052、 AA5252, AA5352, AA5018, AA4045 or AA7072.

After splicing, such as at crimping or after being engaged by the pressurization that clamps or rivet, the structure engaged can be entered Row artificial aging heat treatment, this heat treatment can eliminate or at least reduce such as susceptibility for delayed fracture.This heat treatment To carry out at a temperature of 50 DEG C to 250 DEG C.This heat treatment can be as single step Ageing Treatment or as multistep Ageing Treatment (example Such as 2 steps or 3 step Ageing Treatment) carry out.The preferred upper limit of heat treatment is about 210 DEG C, more preferably from about 185 DEG C.Too high temperature can Can increase the adverse effect of AA7000-series alloys intensity level after baking vanish process.The preferred lower limit of heat treatment is about 70 DEG C, more preferably from about 100 DEG C.

In defined temperature range, preferably carry out heat treatment so that connected structure is in the time of pre-age temperature not More than 5 hours, it is more preferably no more than about 1 hour, to avoid reducing productivity ratio.Shortest time is about 1 minute.Generally, heat treatment Carry out several minutes at said temperatures, such as 2 minutes to 30 minutes, e.g., from about 4 minutes or 8 minutes.

Or, described artificial aging heat treatment can also be carried out with baking vanish process simultaneously.After bonding operation, such as exist After crimping or the pressurization passing through to clamp or rivet engage, the assembly of joint typically comprises of other metal assembly assembly Divide (being common for manufacturing the field of motor vehicle assembly), and the assembly engaged is carried out baking operations, made with solidification Any coating or enamelled coating.During baking vanish, the AA7000-series alloy used in conjugative component reaches its expection Final strength level.Typically, baking operations or baking vanish process include the heat treatment that one or more continuous print is short, described short Heat treatment continue in the range of 120 DEG C to 200 DEG C 10 minutes to less than 40 minutes, typically smaller than 30 minutes.Typical baking vanish Process includes about 180 DEG C, the first time heat treatment of 20 minutes, is cooled to ambient temperature, the most about 160 DEG C, the heat of 20 minutes Process and be cooled to ambient temperature.In the production depending on OEM, such baking vanish process may comprise 2 until 5 continuous Step, and include drying steps, but no matter which kind of mode, alloy product is in the cumulative time of high temperature (100 DEG C-200 DEG C) Less than 120 minutes.

In another aspect of this invention, described method is used for manufacturing structural partsof automobiles or component, described structure member It is preferably chosen from the group with lower component: Men Liang, back timber, curb girder, fascia supports beam, post reinforcement, pipeline (tunnel), B-post (reinforcement) and fire wall.

In another aspect of this invention, the present invention relates to the metal work being made up of AA7000-series aluminium alloy sheet material The purposes of part, described metal works has the most preferably alloy composition, and at least warp in its engaging zones Overheating Treatment, described heat treatment manufacturing before joint at most 120 minutes, be carried out within 60 seconds at 100 DEG C to 350 DEG C, and/ Or carry out at least part of time during manufacturing mechanical splice, described joint is by being engaged (especially with clamping Or riveting) prepare to another metal works.

Accompanying drawing explanation

Now with reference to accompanying drawing, by preferred implementation and embodiment, present invention is described, wherein:

Fig. 1: show the schematic diagram of the method according to embodiment of the present invention；

Fig. 2: show the time-temperature curve of during heating treatment workpiece；

Fig. 3: be the schematic diagram of possible Induction Heat Treatment Equipment；

Fig. 4: show in AA7000-series aluminium alloy sheet, from local heat treatmet center, cross heat affected area Territory, the figure of hardness measurement (HV) of the various position of non-heat treatment section to sheet material；

Fig. 5: show be in the T4-degree of temper (T4-temper) riveting two AA7000-line aluminium alloy sheet materials 13, The top view of the riveted joint (rivet 4) of 14 and side view (cross section)；

Fig. 6: show after making T4-degree of temper sheet material stand 10 seconds at 180 DEG C, two AA7000-systems of riveting The top view of the riveted joint (rivet 4) of aluminum alloy sheet 13,14 and side view (cross section)；

Fig. 7: show that the riveting of two AA7000-series aluminium alloy sheet 13,14 of thickness respectively 1mm and 3mm connects Head, use rivet C5 × 5H4(11), 55kN stamping press, riveting before between two sheet materials, employ binding agent；

Fig. 8: show AA6016-alloy sheet material 15(thickness=1.0mm) AA7000 series aluminium alloy sheet 14(thickness= Riveted joint on 3.0mm).Rivet 11 is identical with Fig. 7 with stamping press, additionally, reused adhesives；

Fig. 9: show AA6016 alloy sheet material 15(thickness 1.0mm) at AA7081 alloy 16(thickness 2.0mm) on riveting Joint, uses rivet C5 × 5H4(11), 47kN stamping press and binding agent；

Riveted joint between Figure 10: two AA7000-series aluminium alloy sheet 13,14, each sheet material thickness 3.0mm, make With solid rivet 5 × 6.3(12), 50kN stamping press and binding agent.

Fig. 1 shows the series of steps as embodiment of the present invention ingredient.In step, return with T4x or W- Fire degree provides initial workpiece or blank (blanks) 1,1'.In order to carry out contacting heat treatment to it, its part is put Between two hot plates 2,3 being heated to 180 DEG C.In following step B, carried out by the hot plate 2,3 contacted with blank Short local heat treatmet.In step C, in atmosphere blank is cooled to room temperature.In step D, in aforementioned heating and cooling In finite time afterwards, rivet 4 is used to manufacture mechanical splice between blank 1 and another sheet material.

Another preferably, provide the mechanism (set-up) of heat treatment as shown in Figure 3: wherein, induction coil 5 is placed in base Above the specific region of part or workpiece 1.Such as, the internal diameter of induction coil is 10mm, and external diameter is 15mm.By (infrared ray) pyrometer 7 pairs of temperature measure and control.This heat treatment makes to obtain region 10 that is thermally treated thus that soften, institute in workpiece 1 The diameter stating region 10 is about 15mm, i.e. the external diameter of induction coil.In this region, 120 after applying local heat treatmet In minute, can generate and clamp joint or riveted joint.

Fig. 2 shows the typical temperature-time curve within thermally treated region 10, and described region 10 is by such as Fig. 3 Shown sensing heated mechanical obtains.Left figure have employed the sheet material that 2mm is thick, and right figure have employed the sheet material that 3mm is thick.Visible, specification Th heat time heating time needed for the sheet material of 2mm is about 2 seconds, and the heating of 3mm sheet material needs about 4 seconds.Retention time is actually 0,1 Second, change between 5 seconds and 10 seconds.For all of retention time, even the retention time is almost 0 in the case of, all be proved to produce Give birth to good result.Therefore, it is concluded that the shortest heat treatment is sufficient to.

Fig. 4 shows in AA7000-series aluminium alloy sheet, from stand local heat treatmet region (position 0 to 20mm) rise, cross heat-affected zone (position 0 to-10mm), various to the non-heat treatment section (position-10 to-20mm) of sheet material The figure of the hardness (HV) of position.

It will be apparent from this figure that the intensity of all positions is in same level after T79 Ageing Treatment, it was demonstrated that 180 DEG C carry out short local heat treatmet 5 seconds (locally recovery annealing processes, local reversion anneal treatment) right Final strength is without negative effect.

Detailed description of the invention

There is provided the following example further objects and advantages of the present invention to be illustrated.But, it is not intended that to appoint Where the scope of the present invention is limited by formula.

Embodiment 1

Two sheet materials (specification of each sheet material is 2mm) being made up of AA7000-series alloys are following by having Composition (in terms of wt%) AA7000 series alloy casting and manufacture: the Zn of 6.4, the Mg of 1.9, the Zr of 0.14, the Fe of 0.15 and The Si of 0.1, remaining is aluminum and inevitable impurity.Ingot casting is homogenized, peels off epidermis (scalped), hot rolling, cold rolling To final specification, finally through solution heat treatment to the T4 degree of temper.Use two kinds of commercially available riveting technologies, by SPR joint by sheet Material engages.

In test for the first time, two sheet materials are in T4 state and (exceed through solution heat treatment, quenching natrual ageing 6 months), the photo of obtained joint is shown in Fig. 5.It will be clear that sheet material exists not from the photo of Fig. 5 The crackle desirably formed.

In testing at second, the identical sheet material being in T4 state is heat-treated 10 seconds at 180 DEG C, the coldest But to room temperature, in about 5 minutes the most after cooling, twice SPR technique is used to be engaged by sheet material.From the photo of Fig. 6 It will be clear that the advantage of heat treatment: in sheet material, do not form crackle, thus form (sound) in order, can weigh Existing SPR joint.

In this test mechanism, whole sheet material is carried out heat treatment, but the most aobvious and easy See, identical effect can be obtained when carrying out heat treatment in engaging zones local.

Embodiment 2

Test similar to Example 1 has been carried out with other sheet materials various.The composition of sheet material, rivet type, stamping press etc. It is listed in the table below in 2.Before riveting, T4 degree of temper sheet material subjected to the heat treatment of 1 second to 10 seconds at 190 DEG C, and in heat Riveted in processing latter 2 hours.Gained riveted joint shown in Fig. 7-10 shows not formed crackle, and at every kind Situation has been respectively formed in order, reproducible joint.

Although the various embodiments of described herein technology are described in detail, it is apparent that those skilled in the art will Will recognize that and these embodiments are improved and adjusts.However, it should be clear that be understood by, these improve and adjustment is in this Within inventing the spirit and scope of disclosed technology.

Claims (25)

1. the method manufacturing joint in the metal works overlapping at least two, described method uses joint instrument to exist Mechanical splice is obtained between the workpiece of described overlap；And wherein, at least one in the first workpiece and second workpiece be by The sheet material that AA7000-series alloys is made；And wherein, in manufacturing 120 minutes before described joint and/or Manufacture at least part of time during described joint, at least the workpiece of described 7000-series sheet material applied heat treatment, Thus reduce the hot strength of the engaging zones of the most described 7000-series sheet material material work piece, and wherein, described 7000-series The heat treatment of sheet material includes the temperature being heated to 100 DEG C-230 DEG C, and wherein, does not carries out at the end of described heat treatment Force cooling or hardening step.

The most the method for claim 1, wherein by the way of pressurization engages, the workpiece of described overlap is engaged.

3. method as claimed in claim 1 or 2, wherein, includes adding to the described heat treatment of described 7000-series sheet material The temperature of heat to 140 DEG C-230 DEG C.

4. method as claimed in claim 1 or 2, wherein, is included in the described heat treatment of described 7000-series sheet material The temperature of 100 DEG C-230 DEG C it is heated in the time period of at most 60 seconds.

5. method as claimed in claim 4, wherein, the described heat treatment of described 7000-series sheet material is included in The temperature of 100 DEG C-230 DEG C it is heated in the time period of many 30 seconds.

6. method as claimed in claim 1 or 2, wherein, is manufacturing the described heat treatment of described 7000-series sheet material Carry out in before described joint 120 minutes.

7. method as claimed in claim 6, wherein, is manufacturing institute to the described heat treatment of described 7000-series sheet material Carry out in stating 60 minutes before joint.

8. method as claimed in claim 1 or 2, wherein, is manufacturing the described heat treatment of described 7000-series sheet material At least part of time during described joint is carried out.

9. claim 12 or as described in method, wherein, described AA7000-series alloy selected from include AA7021, The group of AA7136, AA7075, AA7081, AA7181, AA7085, AA7185, AA7050, AA7150 and AA7055.

10. method as claimed in claim 1 or 2, wherein, described AA7000-series alloy has consisting of in terms of wt%:

Optionally, the element in one or both groups formed selected from following elements: Mn 0.05 to 0.5, Cr 0.05 to 0.5, Ti 0 to 0.15, Fe 0 to 0.35, Si 0 to 0.25；

Other element and inevitable impurity, the most up to 0.05%, total amount is up to 0.20%；

The aluminum of surplus.

11. methods as claimed in claim 10, wherein, the content of the described Zn in described AA7000-series alloy be 5.0 to 7.0wt%.

12. methods as claimed in claim 11, wherein, the content of the described Zn in described AA7000-series alloy be 5.5 to 6.5wt%.

13. methods as claimed in claim 10, wherein, the content of the described Mg in described AA7000-series alloy be 1.5 to 2.1wt%.

14. methods as claimed in claim 10, wherein, the content of the described Cu in described AA7000-series alloy be 0 to 0.3wt%.

15. methods as claimed in claim 1 or 2, wherein, described AA7000-series alloy has consisting of in terms of wt%:

Optionally, the element in one or both groups formed selected from following elements: Mn 0.05 to 0.50, Cr 0.05 to 0.5, Ti is most 0.15, Fe is most 0.35, Si most 0.25；

Other element and inevitable impurity, the most up to 0.05%, total amount is up to 0.20%；

The aluminum of surplus.

16. methods as claimed in claim 15, wherein, the content of the described Zn in described AA7000-series alloy be 5.0 to 7.0wt%.

17. methods as claimed in claim 16, wherein, the content of the described Zn in described AA7000-series alloy be 5.5 to 6.5wt%.

18. methods as claimed in claim 15, wherein, the content of the described Mg in described AA7000-series alloy be 1.5 to 2.1wt%.

19. methods as claimed in claim 15, wherein, the content of the described Cu in described AA7000-series alloy be 1.2 to 2.4wt%.

20. methods as claimed in claim 1 or 2, wherein, described mechanical splice obtains by the way of clamping.

21. methods as claimed in claim 1 or 2, described method uses the joint instrument containing drift to be inserted by rivet further Entering to described workpiece to form described joint, described workpiece has the first surface closest to described instrument, described method bag Include and described workpiece be placed between described instrument and mould, and rivet is positioned between described drift and described first surface, With described drift, described rivet is inserted in the workpiece that described at least two is overlapping so that described first surface is by described rivet Pierce through.

22. methods as claimed in claim 21, described joint is the joint of the metal works of at least two overlap, described method Using the joint instrument containing drift, be inserted into self-punching rivet in described workpiece to form described joint, described workpiece has Closest to the first surface of described instrument, described method includes being placed between described instrument and mould described workpiece, and by riveting Nail is positioned between described drift and described first surface, with described drift, described rivet is inserted into described at least two overlapping Workpiece in so that described first surface is pierced through by described rivet；And wherein, in described first workpiece and second workpiece extremely A few sheet material being made up of described AA7000-series alloys；And wherein, 120 before manufacturing described joint In minute and/or in manufacturing at least part of time during described joint, at least to described 7000-series sheet material Workpiece applies heat treatment, thus temporarily reduces the hot strength of the engaging zones of the most described 7000-series sheet material material work piece.

23. methods as claimed in claim 1 or 2, wherein, described in metal works overlapping to described at least two further Joint carries out artificial aging.

24. methods as claimed in claim 1 or 2, wherein, described joint constitutes a part for automotive structural members.

25. methods as claimed in claim 1 or 2, wherein, only execute the described heat treatment of described 7000-series sheet material Add to the flange of described joint to be manufactured in described workpiece.