CN106392300A - Method for prolonging service life of stirring head of friction stir welding - Google Patents
Method for prolonging service life of stirring head of friction stir welding Download PDFInfo
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- CN106392300A CN106392300A CN201611051239.7A CN201611051239A CN106392300A CN 106392300 A CN106392300 A CN 106392300A CN 201611051239 A CN201611051239 A CN 201611051239A CN 106392300 A CN106392300 A CN 106392300A
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- shaft shoulder
- mixing needle
- powder material
- based powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to a method for prolonging the service life of a stirring head of friction stir welding, and belongs to the technical field of welding. WC-Co-based powder materials of nanostructures are sprayed on the surface of a stirring needle and the surface of a shaft shoulder through ultrasonic flame spraying to form WC-Co-based coatings. According to the method for prolonging the service life of the stirring head of friction stir welding, the WC-Co-based powder materials of the nanostructures are sprayed on the surface of the stirring needle and the surface of the shaft shoulder through ultrasonic flame spraying to form the WC-Co-based coatings with high strength, high temperature resistance and high wear resistance on the surface of the stirring needle and the surface of the shaft shoulder, and therefore the performance of the stirring needle can be improved, and the service life of the stirring head can be prolonged. Compared with the prior art, the method has the advantages that the operation steps are simple and the effect is good.
Description
Technical field
The invention belongs to welding technology field, in particular to a kind of side improving the stirring friction welding agitator head life-span
Method.
Background technology
Stirring-head is described as " core " of agitating friction weldering (FSW), is to realize one of important step of agitating friction weldering.Stir
Mix friction welding (FW) be mainly rely on strong friction heat production between high-speed rotation stirring-head and welded piece and plastic extruding deformation and
Complete.
It is generally main working surface at the mixing needle of stirring-head and the shaft shoulder, in high temperature and by severe friction
Etc. under severe service condition, fractureing of the abrasion of work surface, heat exhaustion and mixing needle is the dominant failure mode of stirring-head,
Wherein, the abrasion of working surface leads to the increase of coefficient of friction and then so that the frictional heat of stirring-head is increased, and reduces the strong of mixing needle
Degree, is one of the major reason that fractures leading to mixing needle, and the high temperature abrasion resistance therefore improving stirring-head makes to extending stirring-head
Had great significance with the life-span.
Patent No. CN201510570566.2, the Chinese patent of entitled " a kind of New type agitation friction welding (FW) stirring-head " leads to
The structure crossing butt joint improves, and improves the service life of stirring-head；Patent No. CN201510867276.4, entitled
The Chinese patent of " a kind of method improving agitating friction weldering stirring-head Wear-resistant, high-temperature resistant performance " passes through as cast condition high-speed tool
Steel W18Cr4V is processed into the required matrix shaft shoulder and taper mixing needle pattern using open die forging+die forging FMT；Adopt laser again
The shaft shoulder and mixing needle matrix skin are heated fusing together with preset Ni-based ceramic composite alloy powder thereon by deposition technology
And annular and spiral type Wear-resistant, high-temperature resistant coating stirring head are prepared in condensation rapidly, improve the service life of stirring-head.
But, prior art all haves such problems as that structure and processing technique are complicated.
Content of the invention
In order to solve the problems referred to above of prior art presence, the invention provides a kind of improve the stirring friction welding agitator head longevity
The method of life, to improve high temperature resistant, the crocking resistance of stirring-head, extends its service life；Meanwhile, with respect to prior art,
The method also has the advantages that simple to operate, effect is good.
The technical solution adopted in the present invention is：
A kind of method improving the stirring friction welding agitator head life-span, using HVAF by the WC- of nanostructured
Co based powder material is sprayed at the surface of mixing needle and the shaft shoulder, forms WC-Co base coating.
Based on said method, using HVAF technology, in the presence of gases at high pressure, WC-Co system powder material
Material sprays from spray gun high speed, makes Co phase reach molten condition through flame heating, with supersonic speed and matrix before reaching matrix
Clash into, thus obtaining the coating of densification；And, WC can also effectively be suppressed spray coated by HVAF technology
Decomposition in journey, not only bond strength is high for coating, and fine and close, and abrasion resistance properties are superior, its anti-wear performance significantly exceedes etc. from
Sub- sprayed coating, electrodeposited chromium layers and spray-welding coating etc..
Further, the thickness of described WC-Co base coating is 100-200 μm.
Wherein, the less abrasion of the thickness of WC-Co base coating is faster, and the thickness of WC-Co base coating is excessive, easily causes
Coating cracking, therefore, in order to preferably meet use demand, the coating thickness of WC-Co base coating is preferably 100-200 μm, more
Excellent is 150 μm.
Further, it is added with trace element Cr in described WC-Co based powder material.
Further, in described WC-Co based powder material, the mass content of Co is 6-17%；The mass content of described Cr is
3-5%.
Further, described WC-Co based powder material is WC-12Co dusty material；The mass content of described Cr is 4%.
Co acts primarily as the effect of brittle phase WC of bonding, and the too low coating voidage that is easily caused of its content increases, and reduces coating
Compactness, and its content is excessive, is easily reduced hardness and the wearability of WC-Co base coating, and therefore, the mass content of Co is excellent
Elect 6-17% as, more excellent is 12%.
Meanwhile, Cr is added mainly to improve corrosion resistance in coating, its mass content is preferably 3-5%, and more excellent is 4%.
Wherein, in WC-12Co dusty material, 12Co represents that the content of Co is 12%.
Further, described WC-Co system composite powder is fabricated by using agglomeration process；Wherein, the original grain of WC is average
Particle diameter is 30-500nm, and after pelletize, the mean diameter of described WC-Co system composite powder is 10-40 μm.
Due to refined crystalline strengthening effect, the crystal grain of tiny WC can improve the obdurability of coating, and crystal grain is less, and the difficulty produced is got over
Greatly；Meanwhile, there is space in WC-Co granule, granule is excessive, be easily caused in spraying process and heat insufficient, the cause of reduction coating
Density, and granule is too small, is easily caused powder superfusion, WC is oxidized in atmosphere；Therefore, the mean diameter of the original grain of WC
Be preferably 30-500nm, more excellent for 270nm；The mean diameter of the WC-Co system composite powder after pelletize is preferably 10-40 μm, more
Excellent is 22 μm.
Further, methods described inclusion step in detail below：
(1) pretreatment is carried out to the surface of mixing needle to be sprayed and the shaft shoulder, described pretreatment include cleaning treatment and
Blasted roughization is processed；
(2) mixing needle processing and the shaft shoulder through step (1) are preheated, then adopt HVAF by nanometer
The WC-Co based powder material of structure is evenly applied to the surface of mixing needle and the shaft shoulder, forms WC-Co base coating.
Further, in step (2), during using HVAF, the spraying direction of spray gun is vertical with spray-coating surface, and sprays
The rate travel of rifle keeps uniformly, and controls in 100-1000mm/min.
Wherein, the rate travel of spray gun makes matrix be heated uneven and overweight coating excessively slowly；If spray gun back and forth sprays,
Coating can be made to be in layer structure, and this layer and layer faying face have the defects such as space, therefore, the rate travel of spray gun is too fast,
Laminar type discontinuity can be led to increase, thus reducing the consistency of coating, so the rate travel of rifle is preferably controlled in 100-1000mm/
min.
Further, also include shaft shoulder procedure of processing：Beat multiple equally distributed pits on the surface of the shaft shoulder；Wherein, the shaft shoulder
Before procedure of processing is located at step (1).
Further, described pit is ringwise distributed, and described pit to described mixing needle distance and described pit to institute
The distance stating the outer rim of the shaft shoulder is equal.
Can be avoided because shaft shoulder area is larger plane and leads to the WC-Co base coating in later stage to be opened by pit
Split.
Beneficial effects of the present invention：
The method improving the stirring and friction-welding stirring-head life-span provided by the present invention, by adopting HVAF
The WC-Co based powder material of nanostructured is sprayed at the surface of mixing needle and the shaft shoulder, is formed on the surface of mixing needle and the shaft shoulder
There is high intensity, high temperature resistant, wearability WC-Co base coating, thus improve the performance of stirring-head, extending making of stirring-head
Use the life-span；Meanwhile, the method is with respect to prior art, also has the advantages that operating procedure is simple, effect is good.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the stirring-head described in embodiment 1；
Fig. 2 is the structural representation of the WC-Co base coating described in embodiment 1；
Fig. 3 is the structural representation of the shaft shoulder described in embodiment 2.
In figure is labeled as：
The shaft shoulder 101, mixing needle 102, WC-Co base coating 103, pit 104.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, technical scheme will be carried out below
Detailed description.Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art's obtained owning on the premise of not making creative work
Other embodiment, broadly falls into the scope that the present invention is protected.
Embodiment 1
As depicted in figs. 1 and 2, the present embodiment provides a kind of method improving the stirring friction welding agitator head life-span, using super
The WC-Co based powder material of nanostructured is sprayed at mixing needle 102 and the surface of the shaft shoulder 101 by velocity of sound flame-spraying, forms WC-
Co base coating 103.It comprises the following steps that：
First, pretreatment is carried out to the surface of mixing needle 102 to be sprayed and the shaft shoulder 101, wherein, pretreatment includes cleaning
Process and blasted roughization is processed；The impurity on mixing needle 102 and the shaft shoulder 101 surface, rust, oil can be removed by cleaning treatment
Dirt and oxide layer etc.；Process to improve by blasted roughization and mixing needle 102 and the shaft shoulder 101 surface are carried out clearly
Clean, but also hair side can be formed on mixing needle 102 and the shaft shoulder 101 surface, strengthen WC-Co base coating 103 and mixing needle 102 and
The bond strength on the shaft shoulder 101 surface.
Then, the mixing needle 102 and the shaft shoulder 101 processing through above-mentioned steps is preheated, be conducive to the knot of sprayed on material
Close；Again the WC-Co based powder material of nanostructured is evenly applied to by mixing needle 102 and the shaft shoulder using HVAF
101 surface, forms the WC-Co base coating 103 that thickness is 100 μm.
In the present embodiment, WC-Co based powder material is using the WC-12Co dusty material sending out preparation, wherein, WC's of reuniting
The mean diameter of original grain is 270nm, and after pelletize, the mean diameter (particulate matter diameter) of WC-Co system powder is 22 μm, Co's
Mass content is 12%.
As a kind of preferred version of the present embodiment, in WC-Co based powder material, trace element Cr can also be added, its
In, the mass content of Cr is 4%.
Embodiment 2
The present embodiment provides a kind of method improving the stirring friction welding agitator head life-span, will be received using HVAF
The WC-Co based powder material of rice structure is sprayed at mixing needle 102 and the surface of the shaft shoulder 101, forms WC-Co base coating 103.Its tool
Body step is as follows：
First, the shaft shoulder 101 is processed, as shown in figure 3, the surface of the shaft shoulder 101 make a call to 4 equally distributed recessed
Hole 104, such that it is able to avoid being larger plane and leading to the WC-Co base coating 103 in later stage to be opened because of the shaft shoulder 101 area
Split；Wherein it is preferred to, the distance that pit 104 arrives mixing needle 102 is equal with the distance of the outer rim that pit 104 arrives the shaft shoulder 101.
Then, pretreatment is carried out to the surface of mixing needle 102 to be sprayed and the shaft shoulder 101, wherein, pretreatment includes cleaning
Process and blasted roughization is processed；The impurity on mixing needle 102 and the shaft shoulder 101 surface, rust, oil can be removed by cleaning treatment
Dirt and oxide layer etc.；Process to improve by blasted roughization and mixing needle 102 and the shaft shoulder 101 surface are carried out clearly
Clean, but also hair side can be formed on mixing needle 102 and the shaft shoulder 101 surface, strengthen WC-Co base coating 103 and mixing needle 102 and
The bond strength on the shaft shoulder 101 surface.
Finally, pretreated mixing needle 102 and the shaft shoulder 101 are preheated, be conducive to the combination of sprayed on material；Adopt again
With HVAF, the WC-Co based powder material of nanostructured is evenly applied to mixing needle 102 and the table of the shaft shoulder 101
Face, forms the WC-Co base coating 103 that thickness is 150 μm.
In the present embodiment, WC-Co based powder material using reunite send out be prepared from, wherein, the original grain of WC average
Particle diameter is 500nm, and after pelletize, the mean diameter (particulate matter diameter) of WC-Co system powder is 40 μm.It is preferred that WC-Co system
It is added with trace element Cr, wherein, the mass content of Co is the mass content of 6%, Cr is 3% in dusty material.
In the present embodiment, the quantity of pit can be adjusted according to actually used situation, the quantity of such as pit is 3
Individual, 5 etc..
Embodiment 3
First, the shaft shoulder 101 is processed, makes a call to 3 equally distributed pits 104 on the surface of the shaft shoulder 101, thus
Can avoid because the shaft shoulder 101 area is larger plane and leads to the WC-Co base coating 103 in later stage to ftracture.
Then, pretreatment is carried out to the surface of mixing needle 102 to be sprayed and the shaft shoulder 101, wherein, pretreatment includes cleaning
Process and blasted roughization is processed；The impurity on mixing needle 102 and the shaft shoulder 101 surface, rust, oil can be removed by cleaning treatment
Dirt and oxide layer etc.；Process to improve by blasted roughization and mixing needle 102 and the shaft shoulder 101 surface are carried out clearly
Clean, but also hair side can be formed on mixing needle 102 and the shaft shoulder 101 surface, strengthen WC-Co base coating 103 and mixing needle 102 and
The bond strength on the shaft shoulder 101 surface.
Finally, pretreated mixing needle 102 and the shaft shoulder 101 are preheated, be conducive to the combination of sprayed on material；Adopt again
With HVAF, the WC-Co based powder material of nanostructured is evenly applied to mixing needle 102 and the table of the shaft shoulder 101
Face, forms the WC-Co base coating 103 that thickness is 200 μm；Wherein, the parameter of HVAF is as shown in table 1 below.
Table 1
When meanwhile, using HVAF, the spraying direction of spray gun is vertical with spray-coating surface, and the rate travel of spray gun
Keep uniformly, it is matched with spraying equipment technological parameter, powder feeding rate etc., controls in 100-1000mm/min.
In the present embodiment, WC-Co based powder material using reunite send out be prepared from, wherein, the original grain of WC average
Particle diameter is 30nm, and after pelletize, the mean diameter (particulate matter diameter) of WC-Co system powder is 10 μm.It is preferred that WC-Co system
It is added with trace element Cr, wherein, the mass content of Co is the mass content of 17%, Cr is 5% in dusty material.
Above-described embodiment, the ceramic material WC in WC-Co based powder material has the advantages that high rigidity, high-melting-point, Co phase
Mainly as Binder Phase, Cr can improve the decay resistance of coating.
Meanwhile, using HVAF technology, in the presence of gases at high pressure, WC-Co based powder material is from spray gun
High speed sprays, and makes Co phase reach molten condition through flame heating, clashed into matrix with supersonic speed before reaching matrix, thus
Obtain the coating of densification；And, WC dividing in spraying process can also effectively be suppressed by HVAF technology
Solution, not only bond strength is high for coating, and fine and close, and abrasion resistance properties are superior, its anti-wear performance significantly exceed plasma sprayed coating,
Electrodeposited chromium layers and spray-welding coating etc..
Therefore, by the WC-Co based powder material of nanostructured is sprayed at by mixing needle 102 using HVAF
With the surface of the shaft shoulder 101, formed on the surface of mixing needle 102 and the shaft shoulder 101 and there is high intensity, high temperature resistant, wearability WC-Co
Base coating 103, thus improve the performance of stirring-head, extends the service life of stirring-head；Meanwhile, the method is with respect to existing
Technology, also has the advantages that operating procedure is simple, effect is good.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, all should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by described scope of the claims.
Claims (10)
1. a kind of method improving the stirring friction welding agitator head life-span is it is characterised in that using HVAF by nanometer
The WC-Co based powder material of structure is sprayed at the surface of mixing needle and the shaft shoulder, forms WC-Co base coating.
2. method according to claim 1 is it is characterised in that the thickness of described WC-Co base coating is 100-200 μm.
3. method according to claim 1 and 2 is it is characterised in that be added with micro unit in described WC-Co based powder material
Plain Cr.
4. method according to claim 3 is it is characterised in that in described WC-Co based powder material, the mass content of Co is
6-17%；The mass content of described Cr is 3-5%.
5. method according to claim 4 is it is characterised in that described WC-Co based powder material is WC-12Co powder material
Material；The mass content of described Cr is 4%.
6. method according to claim 3 is it is characterised in that described WC-Co system composite powder is using agglomeration process manufacture
Become；Wherein, the mean diameter of the original grain of WC is 30-500nm, the mean diameter of described WC-Co system composite powder after pelletize
For 10-40 μm.
7. method according to claim 1 and 2 is it is characterised in that inclusion step in detail below：
(1) pretreatment is carried out to the surface of mixing needle to be sprayed and the shaft shoulder, described pretreatment includes cleaning treatment and sandblasting
Roughening is processed；
(2) mixing needle processing and the shaft shoulder through step (1) are preheated, then adopt HVAF by nanostructured
WC-Co based powder material be evenly applied to the surface of mixing needle and the shaft shoulder, form WC-Co base coating.
8. method according to claim 7 is it is characterised in that in step (2), during using HVAF, spray gun
Spraying direction vertical with spray-coating surface, and the rate travel of spray gun keeps uniformly, and controls in 100-1000mm/min.
9. method according to claim 7 is it is characterised in that also include shaft shoulder procedure of processing：Beat many on the surface of the shaft shoulder
Individual equally distributed pit；Wherein, before shaft shoulder procedure of processing is located at step (1).
10. method according to claim 9 is it is characterised in that described pit is ringwise distributed, and described pit is to described
The distance of the distance of mixing needle outer rim to the described shaft shoulder with described pit is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051239.7A CN106392300A (en) | 2016-11-23 | 2016-11-23 | Method for prolonging service life of stirring head of friction stir welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051239.7A CN106392300A (en) | 2016-11-23 | 2016-11-23 | Method for prolonging service life of stirring head of friction stir welding |
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| CN106392300A true CN106392300A (en) | 2017-02-15 |
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| CN201611051239.7A Pending CN106392300A (en) | 2016-11-23 | 2016-11-23 | Method for prolonging service life of stirring head of friction stir welding |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108213304A (en) * | 2018-01-23 | 2018-06-29 | 重庆大学 | A kind of fist formula biomimetic features heavy-duty forging die tool and its manufacturing method |
| CN109514075A (en) * | 2018-10-23 | 2019-03-26 | 上海航天设备制造总厂有限公司 | A kind of functionally gradient stirring friction welding agitator head laser near-net-shape method |
| CN109822208A (en) * | 2019-03-20 | 2019-05-31 | 北京赛福斯特技术有限公司 | A kind of Double-head double-side efficient rate agitating friction soldering equipment and its welding method |
| CN111570994A (en) * | 2020-05-22 | 2020-08-25 | 燕山大学 | Experimental device and experimental method for detecting service life of friction stir welding stirring head |
| CN112553560A (en) * | 2020-12-02 | 2021-03-26 | 长沙黑金刚实业有限公司 | WC-Co alloy coating casing pipe for rock drilling and preparation method thereof |
| CN112719817A (en) * | 2021-02-02 | 2021-04-30 | 铜陵学院 | Split friction stir welding stirring head for laser cladding spiral wear-resistant stripe coating and processing method thereof |
| CN114959544A (en) * | 2022-05-26 | 2022-08-30 | 佳创机械设备制造(固安)有限公司 | Coating capable of prolonging service life of stirring head and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108213304A (en) * | 2018-01-23 | 2018-06-29 | 重庆大学 | A kind of fist formula biomimetic features heavy-duty forging die tool and its manufacturing method |
| CN109514075A (en) * | 2018-10-23 | 2019-03-26 | 上海航天设备制造总厂有限公司 | A kind of functionally gradient stirring friction welding agitator head laser near-net-shape method |
| CN109822208A (en) * | 2019-03-20 | 2019-05-31 | 北京赛福斯特技术有限公司 | A kind of Double-head double-side efficient rate agitating friction soldering equipment and its welding method |
| CN111570994A (en) * | 2020-05-22 | 2020-08-25 | 燕山大学 | Experimental device and experimental method for detecting service life of friction stir welding stirring head |
| CN111570994B (en) * | 2020-05-22 | 2021-04-16 | 燕山大学 | Experimental device and experimental method for detecting service life of friction stir welding stirring head |
| CN112553560A (en) * | 2020-12-02 | 2021-03-26 | 长沙黑金刚实业有限公司 | WC-Co alloy coating casing pipe for rock drilling and preparation method thereof |
| CN112719817A (en) * | 2021-02-02 | 2021-04-30 | 铜陵学院 | Split friction stir welding stirring head for laser cladding spiral wear-resistant stripe coating and processing method thereof |
| CN114959544A (en) * | 2022-05-26 | 2022-08-30 | 佳创机械设备制造(固安)有限公司 | Coating capable of prolonging service life of stirring head and method |
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