CN108580906A - A kind of Thin-wall Aluminum Parts Methods of Surface Quality Control - Google Patents
A kind of Thin-wall Aluminum Parts Methods of Surface Quality Control Download PDFInfo
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- CN108580906A CN108580906A CN201810502631.1A CN201810502631A CN108580906A CN 108580906 A CN108580906 A CN 108580906A CN 201810502631 A CN201810502631 A CN 201810502631A CN 108580906 A CN108580906 A CN 108580906A
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- graphite jig
- thin
- wall aluminum
- jacket
- aluminum parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/1208—Containers or coating used therefor
- B22F3/1216—Container composition
- B22F3/1241—Container composition layered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/1208—Containers or coating used therefor
- B22F3/1258—Container manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/06—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of threaded articles, e.g. nuts
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/54—Electroplating of non-metallic surfaces
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- Manufacturing & Machinery (AREA)
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- Chemical & Material Sciences (AREA)
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- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The purpose of the present invention is to provide a kind of Thin-wall Aluminum Parts Methods of Surface Quality Control, and graphite jig is prepared according to the shape of Thin-wall Aluminum Parts inner surface, carry out nickel plating successively to the surface of graphite jig, chromium plating forms coating.The present invention is by electro graphite mold, the phenomenon that adding coating for graphite jig, graphite minitype particle is easily fallen so as to avoid graphite jig surface layer；The coating can prevent graphite jig in heat and other static pressuring processes, and carbon is permeated into Thin-wall Aluminum Parts；It ensure that the quality and surface flatness of shaped aluminum alloy thin-walled parts inner surface so that the part of processing has higher precision, ensures the perfect cooperation of the part and other parts.
Description
Technical field
The invention belongs to powder equal pressing forming technology fields, and in particular to a kind of Thin-wall Aluminum Parts surface quality control
Method processed.
Background technology
But Powder hot isostatic pressure technology, realization high, high in machining efficiency by stock utilization are few without cutting, section material drop
The advantages that consumption, has obtained utilization in aerospace manufacturing field.The technology generally uses metal or glass material as jacket,
Direct consolidation is carried out to green compact part or dusty material using the extra-high in closed pressure vessel.Utilize the technology
In disposable forming, mostly use the mode generating portion part feature of graphite jig control shape, realize the later stage process less or
Purpose without processing.
The Chinese invention patent that China Patent Publication No. is CN104439238A, patent disclosure day is 2015.03.25 is public
A kind of powder metallurgy high pressure near-net-shape method of aluminium alloy thin-walled crossed stiffened plate structure of cloth, however it is thin in Al alloy powder
In the case that the processing of wall part uses graphite jig, due to the caducous graphite minitype particle in graphite jig surface layer, in aluminium alloy
During powder is packed into jacket and powder vibration dress powder and the artificial powder of dress by force, it can fall into Al alloy powder, be formed
Impurity, and then influence the performance of powder metallurgy alu minium alloy.Meanwhile graphite material is in contact in hot isostatic pressing with dusty material,
In the environment of high temperature and pressure, graphite material will necessarily be diffused to Al alloy powder, this causes to utilize graphite jig control shape
Part inner surface quality it is excessively poor, and be very easy to it is dirty.In the graphite jig removal process in later stage, blasting craft institute
Diamond shape corundum sand can generate grinding to the aluminium alloy on surface, this can reduce the accuracy rule of Thin-wall Aluminum Parts inner surface
It is very little.
Invention content
The purpose of the present invention is to provide a kind of Thin-wall Aluminum Parts Methods of Surface Quality Control, according to aluminium alloy thin-walled
The shape of accessory inner surface prepares graphite jig, carries out nickel plating successively to the surface of graphite jig, chromium plating forms coating；This hair
It is bright that miniature of graphite is easily fallen so as to avoid graphite jig surface layer for graphite jig addition coating by electro graphite mold
The phenomenon that grain；The coating can prevent graphite jig in heat and other static pressuring processes, and carbon is permeated into Thin-wall Aluminum Parts；
It ensure that the quality and surface flatness of shaped aluminum alloy thin-walled parts inner surface so that the part of processing has higher essence
Degree, ensures the perfect cooperation of the part and other parts.
What the present invention was mainly achieved through the following technical solutions：It is prepared according to the shape of Thin-wall Aluminum Parts inner surface
Go out graphite jig, nickel plating is carried out successively to the surface of graphite jig, chromium plating forms coating.The present invention is using plating mode to graphite
Die surface adds coating, carries out Nickel Plating Treatment first, to enhance chrome layer in the quality of coating of graphite surface, then plates again
Chromium.
The present invention adds coating by electro graphite mold, for graphite jig, easily falls so as to avoid graphite jig surface layer
The phenomenon that copyable ink minitype particle；The coating can prevent graphite jig in heat and other static pressuring processes, and carbon is to aluminum alloy thin
It is permeated in wall part；It ensure that the quality and surface flatness of shaped aluminum alloy thin-walled parts inner surface so that the part of processing
With higher precision, ensure the perfect cooperation of the part and other parts.
In order to preferably realize the present invention, further, the graphite jig further includes electrochemical deoiling before adding coating
The step of, graphite jig is placed in the industrial sodium hydroxide solution that temperature is 70~90 DEG C, density is 60~80g/L first
Rinse 5min；Then again by graphite jig place at normal temperatures, density 1.84g/cm3Industrial sulphuric acid in pickling 0.5~
2min；Then graphite jig is placed at normal temperatures, density 1.1g/cm3Industrial hydrofluoric acid in pickling 0.5~2min activation
Processing；Finally graphite jig is washed, is carrying out nickel plating, then dried up after graphite jig is washed, chromium plating is being carried out, in stone
Black surface forms coating.
It is micro- to solve graphite jig surface layer graphite easy to fall off by the way that graphite jig is electroplated after electrochemical deoiling by the present invention
The phenomenon that type particle, avoids graphite minitype particle and falls into spherical Al alloy powder, forms impurity and then influences under isostatic pressed
The quality of molding Thin-wall Aluminum Parts；Simultaneously in hot isotatic pressing forming process, carbon can be in height in graphite jig
It is permeated to molding Thin-wall Aluminum Parts in the case of temperature, Thin-wall Aluminum Parts inner surface structure can be caused coarse,
Graphite is avoided by the graphite jig being electroplated again after electrochemical deoiling at high temperature to permeate Thin-wall Aluminum Parts,
It ensure that the quality and surface flatness of shaped aluminum alloy thin-walled parts.
In order to preferably realize the present invention, further, the Thin-wall Aluminum Parts making includes the following steps：
1）According to graphite jig and the shape of Thin-wall Aluminum Parts being wanted to prepare jacket, the jacket include cylinder, lower cover with
And the upper cover plate with vacuum-pumping tube, side leakage occurs when to prevent from being wrapped in hot isostatic pressing and facilitates welding, jacket upper and lower covers
Plate is designed to u shapes.
2）Root prepares spherical aluminium alloy according to the materials demand of Thin-wall Aluminum Parts using plasma rotating electrode process
Powder, and it is spare to screen out 100-200 mesh powders；Purpose using spherical Al alloy powder is to make it easy to flow, can
The fully narrow slit structure of filling graphite jig.
3）Graphite jig is packed into inner barrel in such a way that pedestal is directed downwardly, since graphite jig material is softer, using people
The mode of work polishing realizes the tight fit of graphite jig and jacket, to prevent graphite jig during hot isostatic pressing shapes
Dislocation and movement, the profile and jacket of graphite jig form the memory space of powder, then by the above-mentioned spherical aluminum prepared
Alloy powder is packed into cylinder, and keeps its closely knit by mechanical oscillation or artificial vibration.
4）Upper cover plate is placed on cylinder upper port and soldering and sealing is good, wherein lower cover is mounted on the lower end of cylinder, and soldering and sealing
It is good.
5）The above-mentioned jacket equipped with graphite jig is placed in heating furnace and is heated, utilizes the equipment vacuumized at high temperature
Vacuumize process is carried out to jacket inside by vacuum tube.
6）Above-mentioned evacuated jacket is placed in hot isostatic apparatus, makes spherical aluminium alloy at high temperature under high pressure
Powder consolidation shapes, and under the action of internal graphite jig, forms Al alloy powder thin-walled inner surface.
7）Jacket is removed using the method for mechanical processing, Al alloy powder thin-walled is processed using conventional machine-tooled method
Thus the outer shape of part obtains the semi-finished product of the internal Thin-wall Aluminum Parts embedded with graphite jig.
8）Internal graphite jig is removed in the way of sandblasting and artificial removal, is finally formed with aluminium alloy thin-walled
Part.
The present invention is precisely operated by each step, by hip moulding technology by spherical Al alloy powder in jacket
In, Thin-wall Aluminum Parts are processed using the easy deformation behavior of jacket and the deformation behavior that is not easy of graphite jig, it is described to utilize heat etc.
Hydrostatic profile technology reduces Thin-wall Aluminum Parts processing step after molding so that the part of processing has higher essence
Degree, ensures the perfect cooperation of the part and other parts.
In order to preferably realize the present invention, further, the graphite jig is bolt shape.Pass through graphite jig shape
Obtained part can form threading path in inner surface, reduce the post-production of Thin-wall Aluminum Parts, reduce cost.
In order to preferably realize the present invention, further, the material of the jacket is commercial-purity aluminium 1060.The jacket
Making material is the material easily deformed upon, can under hip moulding technology by the spherical Al alloy powder in jacket at
Type it is even closer.
In order to preferably realize the present invention, further, the temperature of the heating furnace is 350 DEG C；Vacuum inside jacket
Degree, which is 6-10Pa, not be inverted since there is graphite jig in inside during jacket.The temperature and vacuum pressure are etc.
Premise preparation is carried out in static pressure processing so that in forming parts can density distribution it is uniform, and help to improve isostatic pressing
Part quality afterwards.
In order to preferably realize the present invention, further, the treatment conditions of the hot isostatic pressing are to make heat etc. in 1 hour
The temperature of static pressure equipment is warming up to 470 DEG C, and soaking time is 3 hours；Press the inside of hot isostatic apparatus in 1 hour simultaneously
Power reaches 130MPa, while pressurize 3 hours, and the decrease temperature and pressure time is 55min.Isostatic pressing time, temperature, pressure
For the molding preferred version of this aluminum alloy materials, molding accessory inner surface better quality may make, can coordinate with other parts
It is more accurate.
Beneficial effects of the present invention：
（1）Graphite jig is prepared according to the shape of Thin-wall Aluminum Parts inner surface, the surface of graphite jig is carried out successively
Nickel plating, chromium plating form coating.The present invention adds coating by electro graphite mold, for graphite jig, and the coating avoids stone
The phenomenon that black mold surface layer easily falls graphite minitype particle；Coating can prevent graphite jig in heat and other static pressuring processes simultaneously, carbon
Element is permeated into Thin-wall Aluminum Parts；It ensure that the quality and surface flatness of shaped aluminum alloy thin-walled parts inner surface,
So that the part of processing has higher precision, ensure the perfect cooperation of the part and other parts.
（2）The graphite jig further includes electrochemical deoiling before adding coating.The present invention by after electrochemical deoiling to graphite
Mold is electroplated, and the present invention in the overlay coating of graphite jig by solving miniature of graphite jig surface layer graphite easy to fall off
It the phenomenon that grain, avoids graphite minitype particle and falls into spherical Al alloy powder, form impurity and then influence to be molded under isostatic pressed
Thin-wall Aluminum Parts quality；Simultaneously in hot isotatic pressing forming process, graphite can be in the event of high temperatures to molding
Thin-wall Aluminum Parts permeated, Thin-wall Aluminum Parts inner surface structure can be caused coarse, by after electrochemical deoiling again
The graphite jig being electroplated avoids graphite and is permeated at high temperature to Thin-wall Aluminum Parts, ensure that shaped aluminum alloy
The quality and surface flatness of thin-walled parts.
（3）The graphite jig is bolt shape.It can be formed in inner surface by the part obtained by graphite jig shape
Threading path reduces the post-production of Thin-wall Aluminum Parts, reduces cost.
Description of the drawings
Fig. 1 is the graphite jig structural schematic diagram of the present invention；
Fig. 2 is the wrapping structure schematic diagram of the present invention；
Structural schematic diagram when Fig. 3 is present invention work；
Fig. 4 is the made design of part schematic diagram of apparatus of the present invention.
Wherein：1- cylinders, 2- spherical shapes Al alloy powder, 3- graphite jigs, 4 coating, 5- lower covers, 6- upper cover plates, 7- take out
Vacuum tube, 8- Thin-wall Aluminum Parts.
Specific implementation mode
Embodiment 1：
A kind of 8 Methods of Surface Quality Control of Thin-wall Aluminum Parts, is prepared according to the shape of Thin-wall Aluminum Parts inner surface
Graphite jig 3 carries out nickel plating successively to the surface of graphite jig 3, chromium plating forms coating 4.
The present invention adds coating 4 by electro graphite mold 3, for graphite jig 3, and the coating 4 avoids graphite jig 3
Surface layer easily falls the phenomenon that graphite minitype particle；Coating 4 can prevent graphite jig 3 in heat and other static pressuring processes simultaneously, carbon
It is permeated into Thin-wall Aluminum Parts 8；The quality and surface flatness that ensure that 8 inner surface of shaped aluminum alloy thin-walled parts, make
The Thin-wall Aluminum Parts 8 that must be processed have higher precision, ensure the perfect cooperation of the part and other parts.
Embodiment 2：
The present embodiment optimizes on the basis of embodiment 1, and the graphite jig 3 further includes that chemistry removes before adding coating 4
The step of oil, it is 70~90 DEG C that graphite jig 3, which is placed on temperature, first, and density is in the industrial sodium hydroxide of 60~80g/L
Rinse 5min；And then graphite jig 3 is placed at normal temperatures, density 1.84g/cm3Industrial sulphuric acid in pickling 0.5~
2min；Then graphite jig 3 is placed at normal temperatures, density 1.1g/cm3Industrial hydrofluoric acid in pickling 0.5~2min live
Change；Finally graphite jig 3 is washed, is carrying out nickel plating, then dried up after graphite jig is washed, is carrying out chromium plating.
The present invention is by being electroplated graphite jig 3 after electrochemical deoiling, and the present invention on the surface of graphite jig 3 by plating
Layer 4 solves the phenomenon that 3 surface layer of graphite jig graphite minitype particle easy to fall off, avoids graphite minitype particle and falls into spherical aluminum conjunction
In bronze end 2, forms impurity and then influence the quality of molding Thin-wall Aluminum Parts 8 under isostatic pressed；It is quiet in high temperature etc. simultaneously
During molded, graphite can be permeated to molding Thin-wall Aluminum Parts 8 in the event of high temperatures, can lead to aluminium alloy
8 inner surface structure of thin-walled parts is coarse, and graphite is avoided at high temperature by the graphite jig 3 being electroplated again after electrochemical deoiling
Thin-wall Aluminum Parts 8 are permeated, ensure that the quality and surface flatness of shaped aluminum alloy thin-walled parts 8.
The other parts of the present embodiment are same as Example 1, and so it will not be repeated.
Embodiment 3：
The present embodiment optimizes on the basis of embodiment 1 or 2, and as in Figure 2-4, the Thin-wall Aluminum Parts 8 make
Include the following steps：
1）According to graphite jig 3 and the shape of Thin-wall Aluminum Parts 8 is wanted to prepare jacket, which includes cylinder 1, lower cover
5 and the upper cover plate 6 with vacuum-pumping tube 7, side leakage occurs when to prevent from being wrapped in hot isostatic pressing and facilitates welding, on jacket
Lower cover is designed to u shapes；
2）According to the materials demand of Thin-wall Aluminum Parts 8, spherical Al alloy powder is prepared using plasma rotating electrode process
2, and it is spare to screen out 100-200 mesh powders；Purpose using spherical Al alloy powder 2 is to make it easy to flow, Neng Gouchong
The narrow slit structure of graphite jig 3 is filled out in packing；
3）Graphite jig 3 is packed into such a way that pedestal is directed downwardly inside cylinder 1, since 3 material of graphite jig is softer, using artificial
The mode of polishing realizes the tight fit of graphite jig 3 and jacket, to prevent graphite jig 3 during hot isostatic pressing shapes
Dislocation and movement, the profile and jacket of graphite jig 3 form the memory space of powder, then by the above-mentioned spherical aluminum prepared
Alloy powder 2 is packed into cylinder 1, and keeps its closely knit by mechanical oscillation or artificial vibration；
4）Upper cover plate 6 is placed on 1 upper port of cylinder and soldering and sealing is good, wherein lower cover 5 is mounted on the lower end of cylinder 1, and soldering and sealing
It is good；
5）The above-mentioned jacket equipped with graphite jig 3 is placed in heating furnace and is heated, it is logical using the equipment vacuumized at high temperature
It crosses vacuum-pumping tube 7 and vacuumize process is carried out to jacket inside；
6）Above-mentioned evacuated jacket is placed in hot isostatic apparatus, makes spherical Al alloy powder at high temperature under high pressure
2 consolidations form 8 inner surface of Al alloy powder part under the action of internal graphite jig 3；
7）Jacket is removed using the method for mechanical processing, Al alloy powder thin-walled parts are processed using conventional machine-tooled method
Thus 8 outer shape obtains the semi-finished product of the internal Thin-wall Aluminum Parts 8 embedded with graphite jig 3；
8）Internal graphite jig 3 is removed in the way of sandblasting and artificial removal, is finally formed with aluminium alloy thin-walled zero
Part 8.
As shown in Figure 1, the graphite jig 3 is bolt shape.By aluminium alloy thin-walled obtained by 3 shape of graphite jig
Part 8 can form threading path in inner surface, reduce the post-production of Thin-wall Aluminum Parts, reduce cost.
The present invention is precisely operated by each step, is being wrapped spherical Al alloy powder 2 by hip moulding technology
In set, Thin-wall Aluminum Parts 8, the graphite are processed using the easy deformation behavior of jacket and the deformation behavior that is not easy of graphite jig 3
Mold 3 preferably realizes the quality control of 8 inner surface of Thin-wall Aluminum Parts after work is built in processing so that the aluminium of processing closes
Golden thin-walled parts 8 have higher precision, ensure the perfect cooperation of the part and other parts.
The other parts of the present embodiment are identical as embodiment 1 or 2, and so it will not be repeated.
Embodiment 4：
A kind of 8 Methods of Surface Quality Control of Thin-wall Aluminum Parts, it is as Figure 1-Figure 4, provided by the invention aluminium alloy thin-walled
8 Methods of Surface Quality Control of part includes the following steps：
Graphite jig 3 as shown in Figure 1 is prepared according to the structure of Thin-wall Aluminum Parts 8, which is outside bolt
Shape.
The graphite jig 3 is surface-treated, and coating 4, first graphite are added to 3 surface of graphite jig using plating mode
3 plating nickel on surface of mold, to enhance chrome layer in the quality of coating of graphite surface, then chromium plating again.
According to the appearance and size of the shape of mold 3 and part 8, jacket 1 as shown in Figure 2 is prepared.The jacket includes cylinder
Side leakage and conveniently occurs when to prevent from being wrapped in hot isostatic pressing for body 1, lower cover 5 and the upper cover plate 6 with vacuum-pumping tube 7
Welding, jacket upper and lower cover plates are designed to u shapes；Wherein lower cover 5 is mounted on the lower end of cylinder 1, and soldering and sealing is good；Jacket is using industry
Pure aluminum material is made；The height and the distance between jacket and mold size of jacket are according to the Al alloy powder 2 of required filling
The thickness of layer determines.
According to the demand of Thin-wall Aluminum Parts 8, aluminium alloy 2A12 powder 2 is prepared using plasma rotating electrode process,
And it is spare to screen out 100-200 mesh powders.
The pedestal of the graphite jig 3 is embedded into jacket cylinder 1, and is in contact with lower cover 5, due to graphite jig 3
Material is softer, and the interference fit of graphite jig 3 and jacket cylinder 1 can be realized by the pattern of manual polishing, by above-mentioned preparation
Good spherical Al alloy powder 2 is packed into jacket, and spherical Al alloy powder 2 is made by the way of mechanical oscillation or artificial vibration
It is fully closely knit；Purpose using spherical Al alloy powder 2 is to make it easy to flow, and can fully load jacket and graphite jig 3
Narrow slit structure.
Upper cover plate 6 of the u shape structures with vacuum-pumping tube 7 is embedded into jacket cylinder 1, and sealing is good.
The above-mentioned jacket 1 equipped with mold 3 is placed in heating furnace, the temperature of heating furnace is 350 DEG C, is then led at high temperature
It crosses vacuum equipment and vacuumize process is carried out to jacket 1 using vacuum-pumping tube 7, the vacuum degree inside jacket reaches 6-10 Pa.
By it is above-mentioned vacuumized jacket 1 and be placed in hot isostatic apparatus carry out hip treatment, hip treatment item
Part makes the temperature of hot isostatic apparatus be warming up to 470 DEG C in 1 hour, soaking time is 3 hours；Make heat etc. in 1 hour simultaneously
The internal pressure of static pressure equipment reaches 130MPa, while pressurize 3 hours, and the decrease temperature and pressure time is 55min.
Jacket is removed using the method for mechanical processing, the external shape of part is then processed by the method being integrally machined
Looks obtain aluminium alloy thin-walled structure semi-finished product；Internal graphite jig 3 is removed by way of sandblasting and artificial removal, is obtained most
The whole Thin-wall Aluminum Parts 8 with excellent surface quality.
According to the difference for being formed by Thin-wall Aluminum Parts 8 structure and cavity shape, the shape of graphite jig 3 is not yet
Together, the treatment conditions of hot isostatic pressing will be adjusted correspondingly according to the shape of powder raw material or part.
The present invention adds coating 4 by electro graphite mold 3, for graphite jig 3, and the coating 4 avoids graphite jig 3
Surface layer easily falls the phenomenon that graphite minitype particle；Coating 4 can prevent graphite jig 3 in heat and other static pressuring processes simultaneously, carbon
It is permeated into Thin-wall Aluminum Parts 8；The quality and surface flatness that ensure that 8 inner surface of shaped aluminum alloy thin-walled parts, make
The Thin-wall Aluminum Parts 8 that must be processed have higher precision, ensure the perfect cooperation of the part and other parts.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is every according to
According to the technical spirit of the present invention to any simple modification, equivalent variations made by above example, the protection of the present invention is each fallen within
Within the scope of.
Claims (7)
1. a kind of Thin-wall Aluminum Parts Methods of Surface Quality Control, which is characterized in that according to Thin-wall Aluminum Parts（8）Interior table
The shape in face prepares graphite jig（3）, to graphite jig（3）Surface carry out successively nickel plating, chromium plating formed coating（4）.
2. a kind of Thin-wall Aluminum Parts Methods of Surface Quality Control according to claim 1, which is characterized in that the stone
Black mold（3）In addition coating（4）Before further include the steps that electrochemical deoiling, first by graphite jig（3）It is 70 to be placed on temperature
~90 DEG C, density be 60~80g/L industrial sodium hydroxide solution in rinse 5min；Then again by graphite jig（3）It is placed on
Under room temperature, density 1.84g/cm3Industrial sulphuric acid in 0.5~2min of pickling；Then by graphite jig（3）It is placed on room temperature
Under, density 1.1g/cm3Industrial hydrofluoric acid in pickling 0.5~2min activation process；Finally by graphite jig（3）Washing,
Nickel plating is carried out, then by graphite jig（3）It is dried up after washing, is carrying out chromium plating, to form coating in graphite surface（4）.
3. a kind of Thin-wall Aluminum Parts Methods of Surface Quality Control according to claim 1 or 2, which is characterized in that also
Include the following steps：
1）According to graphite jig and the shape of Thin-wall Aluminum Parts is wanted to prepare jacket, which includes cylinder（1）, lower cover
（5）And carry vacuum-pumping tube（7）Upper cover plate（6）, side leakage occurs when to prevent from being wrapped in hot isostatic pressing and facilitates welding,
Jacket upper and lower cover plates is designed to u shapes；
2）Root prepares spherical Al alloy powder according to the materials demand of Thin-wall Aluminum Parts using plasma rotating electrode process
（2）, and it is spare to screen out 100-200 mesh powders；
3）By graphite jig（3）It is packed into cylinder in such a way that pedestal is directed downwardly（1）Inside, due to graphite jig（3）Material is softer, adopts
The mode manually polished realizes graphite jig（3）With the tight fit of jacket, to prevent graphite jig（3）Hot isostatic pressing at
Dislocation during shape and movement, graphite jig（3）Profile and jacket formed powder memory space, then by above-mentioned system
The spherical Al alloy powder got ready（2）It is packed into cylinder（1）It is interior, and keep its closely knit by mechanical oscillation or artificial vibration；
4）By upper cover plate（6）It is placed on cylinder（1）Upper end, and soldering and sealing is good,；Wherein lower cover（5）Mounted on cylinder（1）Under
End, and soldering and sealing is good；
5）Graphite jig is housed by above-mentioned（3）Jacket be placed in heating furnace and heat, at high temperature using the equipment vacuumized,
Pass through vacuum-pumping tube（7）Vacuumize process is carried out to jacket inside；
6）Above-mentioned evacuated jacket is placed in hot isostatic apparatus, makes spherical Al alloy powder at high temperature under high pressure
（2）Consolidation, in internal graphite jig（3）Under the action of, form Al alloy powder thin-walled parts（8）Surface；
7）Jacket is removed using the method for mechanical processing, Al alloy powder thin-walled parts are processed using conventional machine-tooled method
（8）Outer shape, thus obtain internal being embedded with graphite jig（3）Thin-wall Aluminum Parts semi-finished product；
8）By internal graphite jig in the way of sandblasting and artificial removal（3）Removal, is finally formed with aluminium alloy thin-walled
Part（8）.
4. a kind of Thin-wall Aluminum Parts Methods of Surface Quality Control according to claim 1, which is characterized in that the stone
Black mold（3）For bolt shape.
5. a kind of Thin-wall Aluminum Parts Methods of Surface Quality Control according to claim 3, which is characterized in that the packet
The material of set is commercial-purity aluminium 1060.
6. a kind of Thin-wall Aluminum Parts Methods of Surface Quality Control according to claim 3, which is characterized in that described to add
The temperature of hot stove is 350 DEG C；Vacuum degree inside jacket is 6-10Pa, since there is graphite jig in inside（3）, in the mistake of jacket
It is not inverted in journey.
7. a kind of Thin-wall Aluminum Parts Methods of Surface Quality Control according to claim 3, which is characterized in that the heat
The treatment conditions of isostatic pressed are that the temperature of hot isostatic apparatus is made to be warming up to 470 DEG C in 1 hour, and soaking time is 3 hours；Together
When so that the internal pressure of hot isostatic apparatus is reached 130MPa in 1 hour, while pressurize 3 hours, decrease temperature and pressure time are
55min。
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| CN112828601A (en) * | 2020-12-31 | 2021-05-25 | 长沙中传航空传动有限公司 | Device and method for machining propeller pitch control shaft of tail reducer of helicopter |
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