CN106392460A - Defect repairing method for magnesium/aluminum alloy casting - Google Patents
Defect repairing method for magnesium/aluminum alloy casting Download PDFInfo
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- CN106392460A CN106392460A CN201610962778.XA CN201610962778A CN106392460A CN 106392460 A CN106392460 A CN 106392460A CN 201610962778 A CN201610962778 A CN 201610962778A CN 106392460 A CN106392460 A CN 106392460A
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- magnesium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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Abstract
The invention provides a defect repairing method for a magnesium/aluminum alloy casting. The repairing method comprises the steps that the specification of a stirring needle is designed according to the material characteristics of magnesium/aluminum alloy; the defect portion of the casting is positioned before defect repairing, and a back-side ejecting tool is designed according to the structural form of the casting; the traveling path of a stirring head is set through programmable control equipment according to the area and the distribution positions of defects of the casting, and the stirring needle travels on the surface of the casting in a pressed mode along with the stirring head for solid-phase repairing, wherein the distance between stirring needle tracks is smaller than or equal to phi/2, phi is the diameter of the root portion of the stirring needle, and the ratio of the rotating speed of the stirring head to the traveling speed of the stirring needle is greater than or equal to 10; and tail key holes left by the stirring needle are filled after solid-phase repairing is completed. According to the defect repairing method for the magnesium/aluminum alloy casting, defect repairing of the casting is completed in a shaping state, internal stress of a microstructure is avoided, and the problem that defects are caused by repairing again is solved.
Description
Technical field
The present invention relates to Casting Equipment technical field, particularly to a kind of magnesium, aluminium alloy castings defect-restoration method therefor.
Background technology
Magnesium, aluminium alloy are widely used in the neck such as Aeronautics and Astronautics industry because of the characteristic of its low-density, high intensity, high rigidity
Domain, wherein more extensive with the application of cast magnesium alloy.Easily all kinds of casting flaws in casting process in magnesium, aluminium alloy,
Common are loose, shrinkage cavity, pore, crackle, cold shut, misrun, slag inclusion and segregation etc..Except taking technique in casting process
Measure and enhance process control are outer, and the soldering for casting defect has just become important remedial measure.Argon tungsten-arc welding is current
Widely used casting defect repair method, because casting magnesium, aluminum alloy part process of patch weld are complicated, metal freezing mistake in molten bath
Crackle, pore, slag inclusion and the defect such as loose easily occur in journey, it is wide variety of that this problem has become as restriction magnesium, aluminium alloy
Bottleneck.
Britain's institute of welding research invention Friction stir welding in 1991.Its principle be using use high temperature resistant,
Two welded piece seam crossings, stirring-head and the friction of workpiece rigidly fixing are inserted in the stirring-head high-speed rotation that anti-abrasive material is made
Producing heat makes the metal of surrounding reach plasticity soft state.Being rotationally advancing with stirring-head, plastic metal stirs in mixing needle
There is vertical flowing, the plastic metal of two welded pieces mixes and recrystallizes realization even in the presence of mixing power
Connect.Because, in whole process, workpiece only reaches plasticity soft state without melting, therefore agitating friction weldering is a kind of
Continuous solid phase joining technique.Compared with traditional fusion welding method, in agitating friction connection procedure, there is not molten bath, it is to avoid alloy
The defects such as crack that liquid rapid solidification leads to, pore, simultaneously because solid diffusivity temperature is relatively low, heat affected area is little, junction power
Learn performance good.
Missouri, USA university, in the Friction stir welding based on TWI invention in 2000, proposes mixing yoghurt
(friction stir processing is abbreviated as FSP) technique.There is presently no and be applied to magnesium, aluminium alloy using above-mentioned technique
In casting defect.
Content of the invention
It is an object of the invention to provide a kind of magnesium, aluminium alloy castings defect-restoration method therefor, to solve magnesium alloy, aluminium closes
The Aero-Space such as gold commonly use the low success rate of problem of repair welding of thin-wall complicated foundry goods.
In order to solve above-mentioned technical problem, the technical scheme is that：A kind of magnesium, aluminium alloy castings defect repair are provided
Method, including：According to the material characteristicses of magnesium, aluminium alloy, design the specification of mixing needle；The lossless inspection of X- light is utilized before defect repair
Measurement equipment positions casting defect position, holds out against frock according to the casting structure form design back side；According to casting defect area and point
Cloth position, sets stirring-head track route using programmable control device, and described mixing needle pushes in cast(ing) surface with stirring-head
Walking, carries out solid phase reparation, and from less than or equal to φ/2, φ is mixing needle root diameter (RD) to described stirring needle track spacing, described stirring
Head rotating speed and described mixing needle speed of travel ratio are more than or equal to 10；The afterbody spoon that mixing needle stays is filled up after the completion of solid phase reparation
Hole.
Further, the length of described mixing needle and the ratio of the shaft shoulder diameter of stirring-head are 0.2 ~ 0.8.
Further, the length of described mixing needle 1 ~ 3mm fewer than casting section thickness.
Further, the described back side holds out against frock and is less than or equal to 0.05mm with the patch tire degree of described foundry goods.
Further, when carrying out solid phase reparation, the described stirring-head rotating speed of selection is 50 ~ 2500rpm, described mixing needle row
Walking speed is 10 ~ 500mm/min.
Further, before solid phase reparation, mixing needle pressing speed 0.5 ~ 1mm/s, drafts is below cast(ing) surface 0.1
~ 0.5mm, the upset force of stirring-head is（δ×1000）N, wherein δ are sheet metal thickness.
Further, after the completion of the reparation of foundry goods planar defect, the afterbody keyhole that mixing needle stays is filled up using arc-welding mode,
Arc welding process adopts inert gas shielding.
Further, when filling up afterbody keyhole, arc-welding electric current is 30 ~ 350A, arc-welding wire feed rate 0.5 ~ 5m/min.
Further, described mixing needle is fixed on stirring-head end.
The magnesium of present invention offer, aluminium alloy castings defect-restoration method therefor, using the principle of frictional heat, make casting defect repair
Reset is put metal and is in moulding state, carries out recrystallizing shaping in the presence of being organized in forging and stamping, eliminates parts locally thawing and draws
The stress mutation rising, solves the problems, such as to be reintroduced back to defect in conventional arc defect repair；Panel density is relatively forged by cast sturcture
Little, the requirement to equipment upset force reduces, it is possible to decrease the rigid requirements of repair welding equipment, lifting means compactedness；Make through stirring
With rear, casting flaw position crystal grain refinement, mechanical property is improved；Keyhole position structure refinement under stirring, can adopt
Complete keyhole with traditional arc welding method to fill up, reduce the design difficulty of pumpback formula mixing plant, it is easy to accomplish this process equipment
Engineering promote.
Brief description
Below in conjunction with the accompanying drawings invention is described further：
Fig. 1 is magnesium provided in an embodiment of the present invention, the steps flow chart schematic diagram of aluminium alloy castings defect-restoration method therefor；
Fig. 2 is stirring-head provided in an embodiment of the present invention, mixing needle and have defective foundry goods structural representation；
Fig. 3 is equipment entirety schematic configuration diagram when magnesium provided in an embodiment of the present invention, aluminium alloy castings defect repair.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, magnesium proposed by the present invention, aluminium alloy castings defect-restoration method therefor are made into one
Step describes in detail.According to following explanation and claims, advantages and features of the invention will become apparent from.It should be noted that, attached
Figure is all in the form of very simplification and all using non-accurately ratio, only real in order to conveniently, lucidly to aid in illustrating the present invention
Apply the purpose of example.
The core concept of the present invention is, the magnesium of present invention offer, aluminium alloy castings defect-restoration method therefor, using friction life
The principle of heat, makes casting defect repair position metal and is in moulding state, be recrystallized in the presence of being organized in forging and stamping
Shape, eliminates the stress mutation that parts locally thawing causes, solves the problems, such as to be reintroduced back to defect in conventional arc defect repair；Casting
Make tissue little compared with forging panel density, the requirement to equipment upset force reduces, it is possible to decrease the rigid requirements of repair welding equipment, lifting sets
Standby compactedness；After stirring action, casting flaw position crystal grain refinement, mechanical property is improved；Keyhole position is in stirring
The refinement of effect undertissue, can complete keyhole using traditional arc welding method and fill up, reduce the design difficulty of pumpback formula mixing plant,
The engineering being easily achieved this process equipment is promoted.
Fig. 1 is magnesium provided in an embodiment of the present invention, the steps flow chart schematic diagram of aluminium alloy castings defect-restoration method therefor.Reference
Fig. 1, provides a kind of magnesium, aluminium alloy castings defect-restoration method therefor, including：
S11, the material characteristicses according to magnesium, aluminium alloy, the specification of design mixing needle；
S12, before defect repair utilize X- light non-destructive detecting device position casting defect position, according to casting structure form design
The back side holds out against frock；
S13, according to casting defect area and distributing position, set stirring-head track route using programmable control device, described
Mixing needle pushes walking with stirring-head in cast(ing) surface, carries out solid phase reparation, described stirring needle track spacing from less than or equal to φ/2,
φ is mixing needle root diameter (RD), and described stirring-head rotating speed is more than or equal to 10 with described mixing needle speed of travel ratio；
The afterbody keyhole that mixing needle stays is filled up after the completion of S14, solid phase reparation.
Fig. 2 is stirring-head provided in an embodiment of the present invention, mixing needle and have defective foundry goods structural representation；Figure
3 is equipment entirety schematic configuration diagram when magnesium provided in an embodiment of the present invention, aluminium alloy castings defect repair.With reference to Fig. 2 and figure
3, according to the material characteristicses of magnesium, aluminium alloy, using methods such as numerical simulations, design specialized is in the stirring tool of repair welding of casting, institute
State the end that mixing needle 21 is fixed on stirring-head 22, the length of mixing needle 21 used with the ratio of the shaft shoulder diameter of stirring-head 22 is
0.2~0.8；Length 1 ~ the 3mm fewer than foundry goods 25 wall thickness of described mixing needle 21.Set using X- light Non-Destructive Testing before defect repair
Standby positioning casting defect position 23, designs the back side according to foundry goods 25 version and holds out against frock 24, in embodiments of the present invention, the back of the body
Face holds out against frock 24 and includes back support 241, holding device 242 and load support block 243, assembling process ensure patch tire degree≤
0.05mm.Initial period, it is considered to the deformability difference of magnesium alloy and aluminium alloy, is typically chosen the slower speed that pushes, stirring
Pin pressing speed 0.5 ~ 1mm/s, drafts is below cast(ing) surface 0.1 ~ 0.5mm, and the upset force of stirring-head is（δ×1000）N,
Wherein δ is sheet metal thickness；When carrying out solid phase reparation, according to defect area and distributing position, set using programmable control device
Determine stirring-head 22 track route, when planar defect is repaired, select distance between described mixing needle 21 walking road to be less than or equal to φ/2,
φ is mixing needle 21 root diameter (RD), and stirring-head 22 rotating speed is 50 ~ 2500rpm, and in embodiments of the present invention, in Fig. 2, arrow 1 is to stir
Mix 22 direction of rotation, mixing needle 21 speed of travel is 10 ~ 300cm/min, in Fig. 2, arrow 2 is the walking side of mixing needle 21
To the rotating speed of stirring-head 22 is more than or equal to 10 with described mixing needle 21 speed of travel ratio；Arc-welding is adopted after the completion of solid phase reparation
Mode fills up the afterbody keyhole that mixing needle 21 stays, and when filling up afterbody keyhole, arc-welding electric current is 30 ~ 350A, arc-welding wire feed rate
0.5 ~ 5m/min, arc welding process adopts inert gas shielding.
Magnesium provided in an embodiment of the present invention, aluminium alloy castings defect-restoration method therefor are mainly used in Mg-Al system, Mg-RE system
Etc. the reparation of magnesium alloy foundry goods, the defect repair for other Mg alloy castings such as aluminium alloys is equally applicable.
Obviously, those skilled in the art can carry out the various changes and deformation essence without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprise these changes and modification.
Claims (9)
1. a kind of magnesium, aluminium alloy castings defect-restoration method therefor are it is characterised in that include：
According to the material characteristicses of magnesium, aluminium alloy, design the specification of mixing needle；
X- light non-destructive detecting device is utilized to position casting defect position, according to the casting structure form design back side before defect repair
Hold out against frock；
According to casting defect area and distributing position, set stirring-head track route, described stirring using programmable control device
Pin pushes walking with stirring-head in cast(ing) surface, carries out solid phase reparation, and from less than or equal to φ/2, φ is described stirring needle track spacing
Mixing needle root diameter (RD), described stirring-head rotating speed is more than or equal to 10 with described mixing needle speed of travel ratio；
The afterbody keyhole that mixing needle stays is filled up after the completion of solid phase reparation.
2. magnesium as claimed in claim 1, aluminium alloy castings defect-restoration method therefor are it is characterised in that the length of described mixing needle
Ratio with the shaft shoulder diameter of stirring-head is 0.2 ~ 0.8.
3. magnesium as claimed in claim 1 or 2, aluminium alloy castings defect-restoration method therefor are it is characterised in that the length of described mixing needle
Degree is fewer 1 ~ 3mm than casting section thickness.
4. magnesium as claimed in claim 1, aluminium alloy castings defect-restoration method therefor are it is characterised in that the described back side holds out against frock
It is less than or equal to 0.05mm with the patch tire degree of described foundry goods.
5. magnesium as claimed in claim 1, aluminium alloy castings defect-restoration method therefor it is characterised in that carry out solid phase repair when,
Described stirring-head rotating speed is selected to be 50 ~ 2500rpm, the described mixing needle speed of travel is 10 ~ 500mm/min.
6. magnesium as claimed in claim 1, aluminium alloy castings defect-restoration method therefor are it is characterised in that before solid phase is repaired, stir
Pin pressing speed 0.5 ~ 1mm/s, drafts is below cast(ing) surface 0.1 ~ 0.5mm, and the upset force of stirring-head is（δ×1000）N,
Wherein δ is sheet metal thickness.
7. magnesium as claimed in claim 1, aluminium alloy castings defect-restoration method therefor are it is characterised in that foundry goods planar defect is repaired
After the completion of the afterbody keyhole that mixing needle stays is filled up using arc-welding mode, arc welding process adopts inert gas shielding.
8. magnesium as claimed in claim 7, aluminium alloy castings defect-restoration method therefor are it is characterised in that arc when filling up afterbody keyhole
Weldering electric current is 30 ~ 350A, arc-welding wire feed rate 0.5 ~ 5m/min.
9. magnesium as claimed in claim 1, aluminium alloy castings defect-restoration method therefor are it is characterised in that described mixing needle is fixed on
Stirring-head end.
Priority Applications (1)
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| CN201610962778.XA CN106392460A (en) | 2016-11-04 | 2016-11-04 | Defect repairing method for magnesium/aluminum alloy casting |
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|---|---|---|---|
| CN201610962778.XA CN106392460A (en) | 2016-11-04 | 2016-11-04 | Defect repairing method for magnesium/aluminum alloy casting |
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Cited By (4)
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| CN109570711A (en) * | 2018-12-18 | 2019-04-05 | 内蒙古机集团林峰特种铸造有限公司 | Aluminium silicon magnesium material aluminium alloy crackle welding method |
| CN110625322A (en) * | 2019-08-23 | 2019-12-31 | 北京星航机电装备有限公司 | Method for quickly positioning and accurately repairing internal defect part of complex casting |
| CN113601103A (en) * | 2021-06-25 | 2021-11-05 | 上海航天精密机械研究所 | Method for repairing defects of aluminum and magnesium alloy castings |
| CN114985903A (en) * | 2022-07-18 | 2022-09-02 | 吉林大学 | Method for repairing micro-holes on surface of laser-nitrided amorphous alloy by mechanical scribing |
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Cited By (5)
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| CN113601103A (en) * | 2021-06-25 | 2021-11-05 | 上海航天精密机械研究所 | Method for repairing defects of aluminum and magnesium alloy castings |
| CN114985903A (en) * | 2022-07-18 | 2022-09-02 | 吉林大学 | Method for repairing micro-holes on surface of laser-nitrided amorphous alloy by mechanical scribing |
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Application publication date: 20170215 |