CN104525953B - Ultrasonic assisted powder injection molding device and method - Google Patents
Ultrasonic assisted powder injection molding device and method Download PDFInfo
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- CN104525953B CN104525953B CN201510018414.1A CN201510018414A CN104525953B CN 104525953 B CN104525953 B CN 104525953B CN 201510018414 A CN201510018414 A CN 201510018414A CN 104525953 B CN104525953 B CN 104525953B
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Abstract
The invention relates to an ultrasonic assisted powder injection molding device and method. The device comprises an internal mixing device and an injection molding device. An internal mixing cavity is formed inside a shell of the internal mixing device, and a feeding hole communicated with the internal mixing cavity is formed in the surface of the shell. A rotor is arranged in the internal mixing cavity of the internal mixing device. A pressing weight is arranged at the feeding hole and is suitable for sealing the feeding hole. The injection molding device comprises a threaded rod injection molding machine and an injection mold. The feedstock obtained by internal mixing through the internal mixing device is injected into the injection mold through the threaded rod injection molding machine, and blanks are obtained by molding. A first energy converter is connected with the internal mixing device, and a second energy converter is connected with the injection mold. The first energy converter and the second energy converter are connected with an ultrasonic generator respectively, and are suitable for driving the internal mixing device and the injection mold respectively for supersonic vibration. The ultrasonic assisted powder injection molding device and method can effectively remove the agglomeration phenomenon in the mixing process and lower the mixing temperature, and are especially suitable for the feedstock made of metal or ceramic powder, of irregular shapes or high-carrying capacity, which is hard to inject.
Description
Technical field
The present invention relates to a kind of powder injection-molded device and method, and in particular to a kind of ultrasonic wave added metal or ceramics
Last Coinjection molding apparatus and method.
Background technology
Powder injection-molded technology is for modern plastics injection molding technology being introduced into field of powder metallurgy and being formed
Novel powder metallurgy near-net-shape technology, it combines the advantage of powder metallurgy and the big technology of injection molding of plastics two, both broke through
Restriction of the conventional metals stamping of powder forming technology on shape of product, at the same can high-volume, high efficiency be formed with complexity
The 3 d part of shape, with the incomparable advantage of the processing methods such as conventional powder metallurgical, Precision Machining and hot investment casting, its
Can be as producing plastic, once-forming production complex-shaped metal, ceramic part, at present in national defence, communication, machine
The industries such as tool, automobile, medical treatment are used widely.
In metal or ceramic powders injection molding technology, because powder have solid-state or it is irregularly shaped the characteristics of so that should
The characteristics of technology has different from injection molding of plastics technology, and technologic difficult point.In injection molding of plastics technology, injection is fed
Expect the fused solution for polymer, feeding is injected into after mould makes required finished product blank；And in powder injection forming skill
In art, metal or ceramic powders need first to be mixed into semisolid fluid mixture with binding agent, and compound is injected into mould and makes
The blank of required shape, also needs blank defat except no-bonder after shaping, and after sintering, process finished product is obtained.Two techniques
Flow process is entirely different, and technological difficulties are also different.Especially for obtained in high useful load or irregularly shaped metal or ceramic powders
Feeding, easily there is agglomeration in mixing process in it, and thus feeding component skewness affects shaped article quality
Technical problem.And during injection moulding, feeding poor fluidity, viscosity are too high, it is difficult to inject injection molding and complete to be injected into
The technical problem of type.
Chinese patent CN102962455A discloses a kind of powder metallurgy injection molding technique, comprises the steps：1) will
Metal dust and binding agent carry out in proportion dispensing mixing；2) feeding：Metal dust and binding agent homomixture are put into and are set in advance
In the mold cavity counted and manufacture, under protection of ammonia, warm compaction molding after being heated to 120-140 DEG C in forming process, is utilized
Vibrator drives the mould to be vibrated；3) defat：After the demoulding, hot briquetting product is to 250-300 DEG C；4) sinter, in vacuum
It is sintered under state.The technical scheme adopt for metal powder metallurgy in warm compaction molding technology, metal dust and binding agent
Warm compaction molding in mold cavity is directly placed into after mixing.Compared with injection molding technology is carried out using screw of injection machine, the technology
Mobility with the feeding blended together to feed metal powder and binding agent is less demanding, because the technology of mold friction is special
Point, can cause part wall and core uneven, and cutting the technology can only prepare two-dimensional part with complex shape, it is impossible to prepare
Complicated 3 d part structure, and the parts density of final sintering aftershaping is not high.
Therefore, uniform high useful load feeding how is prepared, increases its flow behavior in process of injection molding, and
The focus that outward appearance is more preferable, the product that quality is more excellent, precision is higher becomes metal or ceramic powders injection moulding field is obtained, is had
Important meaning.
The content of the invention
What the present invention was solved is that mixing is prepared in feeding procedure easily reunites in metal or ceramic powders injection moulding field,
Feeding is uneven, and high useful load feeding is because of the high-leveled and difficult technical problem to inject of viscosity, there is provided one kind is suitable to metal and ceramic powders
Can high useful load, the powder injection-molded device and method of ultrasonic wave added of uniform feeding, improve in mixing process reunite, feed
Material is difficult to the phenomenon injected.
The technical scheme that the present invention is provided is specific as follows：
A kind of powder injection-molded device of ultrasonic wave added, including：
Banburying device, the enclosure interior of the banburying device is provided with banburying chamber, and surface of shell is provided with and the banburying chamber
The material mouth that room communicates；The banburying within the chamber of the banburying device is provided with rotor, ram is provided with the material mouth, it is described
Ram is suitable for sealing the material mouth；
Coinjection molding apparatus, described device includes screw of injection machine, injecting molding die；
Screw of injection machine described in the banburying device banburying gained feeding Jing injects the injecting molding die, injection moulding
Obtain blank；
First transducer is connected with the banburying device, second is connected with the injecting molding die and is changed
Can device；The first transducer and the second transducer respectively with supersonic generator connect setting, be suitable for driving respectively
The banburying device and the injecting molding die carry out supersonic vibration.
Degreasing sintered equipment is additionally provided with, is suitable for carrying out blank made by the injecting molding die defat, sintering.
On the housing of the banburying device, at 2~10mm of the banburying chamber first transducer is provided with.
The first transducer is provided with multiple.
The first transducer is provided with three, respectively positioned at the lower section of the banburying chamber and symmetrical left and right
Side.
The injecting molding die includes：
Cover half device, including the cover half panel seat, solid plate, nozzle and the upper mould that are fixedly connected sequentially from top to bottom；
Die device, including lower mould, moving platen and dynamic model panel seat, the lower mould is located at the underface of the upper mould and fixation
On the moving platen, the dynamic model panel seat is arranged on the lower section of the moving platen, in the dynamic model panel seat and described dynamic
Elastic component is provided between template, the moving platen is suitable for driving the lower mould to carry out in the case where the deformation of the elastic component coordinates
The reciprocating motion of vertical direction；Die cavity is formed on the binding face of the upper surface of the lower surface and lower mould of mould on described；
Push rod, is fixedly connected with the dynamic model panel seat, and the moving platen and lower mould are provided with push rod passage, described to push away
Bar nesting is arranged in the push rod passage and is suitable for being moved back and forth along the push rod passage, the top of the push rod passage
End is connected with the bottom of the die cavity；
Sprue puller, through the moving platen and lower mould sprue puller passage is additionally provided with, and the sprue puller nesting is arranged on institute
State in sprue puller passage and be suitable for being moved back and forth along the sprue puller passage, the bottom connect setting with the sprue puller
There is cylinder；
Nozzle, the nozzle is through the setting of the cover half panel seat, solid plate and upper mould, the outlet of the nozzle and the type
Chamber is connected；
The second transducer with supersonic generator connect setting is provided with the upper mould and/or lower mould.
On described in mould at 10~30mm of nozzle described in distance and in the lower mould die cavity edge 2 described in distance~
Second transducer is respectively arranged with 10mm.
A kind of powder injection-molded method of ultrasonic wave added based on the powder injection-molded device of above-mentioned ultrasonic wave added, including such as
Lower step：
(1) knead：The banburying within the chamber that powder and binding agent are placed in the banburying device is kneaded, in mixing process
In, supersonic generator drives the first transducer to drive the banburying device to carry out supersonic vibration；
(2) injection moulding：The feeding Jing screw of injection machine that mixing is obtained injects the injecting molding die, is injected
Molding, obtains moulded blank；In the process of injection molding, it is described that supersonic generator drives the second transducer to drive
Injecting molding die carries out supersonic vibration.
It is additionally provided with step (3)：The moulded blank is put into into degreasing sintered equipment carries out defat, sintering, obtains finished product.
The signal frequency of supersonic generator described in step (1) and step (2) is 20~40KHZ per second.
Process of injection molding described in step (2) includes matched moulds, injection, pressurize, cooling, die sinking operation.
The powder is metal dust or ceramic powders.
The powder injection-molded device of ultrasonic wave added of the present invention, including banburying device and injecting molding die, it is described
The enclosure interior of banburying device is provided with banburying chamber, and surface of shell is provided with the material mouth communicated with the banburying chamber；Described close
The banburying within the chamber of refining device is provided with rotor, and ram is provided with the material mouth, and the ram is suitable for the material mouth
Sealed；The material mouth connect setting of the injecting molding die and the banburying device；It is fixedly connected with the banburying device
First transducer is provided with, is fixedly connected with the injecting molding die and is provided with second transducer；The first transducer and
The second transducer respectively with supersonic generator connect setting, be suitable for driving the banburying device and the injection respectively
Mould carries out mechanical vibration.Device of the present invention is provided with the transducing being connected with supersonic generator on banburying device
Device, can apply to be motivated by ultrasound in internal mixing pass to mixed material.Using the mechanical effect of ultrasonic activation, in mixing process
Make granule be subject to the shear action that rotor applies and the percussion that ultrasonic field applies simultaneously using ultrasonic wave added, enable to
Grain just can sufficiently be disperseed in a mixing process, the agglomeration of granule effectively be prevented, simultaneously because ultrasonic
The heat effect of ripple vibration, reduces feeding viscosity, such that it is able to be kneaded under low temperature, prepares dispersion more uniform
Feeding.Thus prepare this be uniformly dispersed, viscosity is low, good fluidity high specific gravity, high useful load or erose feeding
Injecting molding die can be entered under the conditions of relatively low injection pressure, and preferably fills the mould so that in gained blank
Metal dust is evenly distributed, and density is high.
The powder injection-molded device of ultrasonic wave added of the present invention is provided with injecting molding die and ultrasound wave occurs
The transducer of device connection, ultrasonic action is applied during injection moulding to mixed material, changes the rheological property of powder, is dropped
Low melt viscosity, meanwhile, feeding particle diameter under resonant frequency therewith is sought by different transducers, make up to optimal effect
Really.Further making the die cavity maximum pressure of powder injection-molded mold filling process reduces, be further implemented in low injection pressure and
Mold Filling Process in Injection Molding is completed under injection temperature, filling capacity and products surface quality is improved, it is powder injection-molded so as to widen
The scope of application, with suitable for erose metal or ceramic powders.
First transducer is arranged on ultrasonic wave added of the present invention powder injection-molded device the lower section of banburying chamber
With symmetrical left and right side.Now, by the transducer of multi-direction setting by the vibrational energy and heat energy of supersonic generator
Amount is uniform, be directly delivered in the banburying chamber of banburying device, fully improve positioned in banburying chamber feeding mixing it is uniform
Property, reduce the generation of agglomeration.
The powder injection-molded device of ultrasonic wave added of the present invention is the improvement carried out on existing Coinjection molding apparatus,
Whole device is simple to operation, cheap.
The powder injection-molded method of ultrasonic wave added of the present invention, comprises the steps that (1) kneads, by powder and bonding
Agent is placed in the banburying within the chamber of the banburying device and is kneaded, and in mixing process, supersonic generator drives described first
Transducer drives the banburying device to carry out supersonic vibration；Step (2) injection moulding：The feeding Jing injector note that mixing is obtained
The injecting molding die is injected, injection moulding is carried out, moulded blank is obtained；In the process of injection molding, ultrasound wave
Generator drives the second transducer to drive the injecting molding die to carry out supersonic vibration.Injection described in step (2)
Forming process includes matched moulds, injection, pressurize, cooling, die sinking operation.The method of the invention is injected in internal mixing pass, entirely
Apply ultrasonic action during type, fully increase the mobile performance of material, reduce operation temperature and pressure.So that high specific gravity,
High useful load or erose powder can prepare high accuracy, highdensity part by ejection forming method.
Description of the drawings
Fig. 1 is kneading device profile of the present invention；
Fig. 2 is Coinjection molding apparatus schematic diagram of the present invention；
Fig. 3 is Coinjection molding apparatus profile of the present invention；
Fig. 4 is sintering temperature curve figure in embodiment 2 and comparative example 2；
Wherein：Reference is：
1- dynamic model panel seats；2- cushion blocks；3- moving platens；4- second transducers；5- water channels；6- solid plates；7- cover half panel seats；8-
Nozzle；The upper moulds of 9-；10- die cavities；Mould under 11-；12- sprue pullers；13- springs；14- push rods；15- ejector pin retaining plates；16- push pedals；
17- banburying devices；18- rotors；19- rams；20- banburying chambers；21- first transducers；
Specific embodiment
Embodiment 1
The powder injection-molded device of ultrasonic wave added described in the present embodiment, including banburying device and Coinjection molding apparatus.
Wherein, banburying device 17 is mixing facilities commonly used in the art, and metal dust is carried out in this device with binding agent
Mixing.As shown in figure 1, the enclosure interior of banburying device 17 is provided with the banburying chamber 20 for containing mixed material, surface of shell
It is provided with the material mouth communicated with banburying chamber 20；Rotor 18 is placed in banburying device banburying chamber 20, and ram is provided with material mouth
19, ram 19 is suitable for sealing material mouth.By binding agent and powder, according to a certain percentage a graded is added by material mouth
To in the banburying chamber 20 of banburying device, sealed in material mouth pressure ram 19, rotated by rotor 18 and kneaded.
On the housing of banburying device, one is provided with the lower section 8mm of banburying chamber 20 and is driven by supersonic generator
First transducer 21, by first transducer 21 vibrational energy of supersonic generator is passed directly in mixing process close
In refining chamber 20, the uniformity of feeding mixing is improved.As deformable embodiment, when the first transducer accommodating chamber sets
When banburying device banburying 20 lower section of chamber, the distance between the first transducer accommodating chamber and described banburying chamber 20
Can be any one value in the range of 2~10mm, and preferably be selected in the range of 3~9mm, for example, the first transducing
Device accommodating chamber is located at the position of the lower section 4mm of banburying device banburying chamber 20,5mm, 6mm, 7mm etc..
The Coinjection molding apparatus in the present embodiment at least include screw of injection machine and injecting molding die；Wherein screw rod
Injector is suitable for using any one screw of injection machine in state of the art；The feeding of gained after end count refining device banburying
In being added to screw of injection machine, then feeding is injected into injecting molding die by screw of injection machine.As preferred embodiment, this
The Coinjection molding apparatus in embodiment can also be additionally provided with breaker and prilling granulator, so that end count refining device
The feeding of gained can be first Jing after broken and pelletize is processed after banburying, in being then added to screw of injection machine；Wherein, broken, pelletize
Purpose be that banburying gained feeding is prepared into into the feeding of required particle diameter, be processing step commonly used in the art.
As shown in Figure 2,3, the injecting molding die basic structure in the present embodiment and similar mould phase commonly used in the art
Together, including：
Cover half device, including the cover half panel seat 7, solid plate 6 and upper mould 9 that are fixedly connected sequentially from top to bottom；
Die device, including lower mould 11, moving platen 3 and dynamic model panel seat 1, lower mould 11 is located at the underface of upper mould 9 and fixation
On moving platen 3, dynamic model panel seat 1 is arranged on the lower section of the moving platen 3, arranges between dynamic model panel seat 1 and moving platen 3
Flexible part, moving platen 3 is suitable for the mould 11 under drive under the deformation cooperation of elastic component carries out the reciprocating motion of vertical direction；
Die cavity 10 is formed on the binding face of the upper surface of the lower surface of upper mould 9 and lower mould 11；
Push rod 14, is fixedly connected with dynamic model panel seat 1, and moving platen 3 and lower mould 11 are provided with push rod passage, the push rod
Nesting is arranged in the passage of the push rod 14 and is suitable for being moved back and forth along push rod passage, the top of the push rod passage with
The bottom of the die cavity 10 is connected；Spring 13 is cased with outside push rod 14.
Sprue puller 12, through moving platen 3 and lower mould 11 sprue puller passage is additionally provided with, and the sprue puller nesting is arranged on institute
State in sprue puller passage and be suitable for being moved back and forth along the sprue puller passage, be connected with the bottom of the sprue puller 12 and set
It is equipped with cylinder；
Nozzle 8, nozzle 8 is arranged through cover half panel seat 7, solid plate 6 and upper mould 9, and the outlet of nozzle 8 is connected with die cavity 10
It is logical；
It is with mould difference commonly used in the art：Respectively set away from the 20mm of nozzle 8 in the symmetrical identity distance of upper mould 9
There is a second transducer 4.The vibrational energy of supersonic generator is passed to the sprue die cavity of nozzle 8 by transducer via upper mould 9
It is interior, further to reduce melt viscosity.As deformable embodiment, when the second transducer, to be symmetrically set in upper mould 9 left
During right, the distance between the second transducer and described nozzle 8 can be any one values in the range of 10~30mm, and excellent
It is selected in the range of 12~28mm, is more preferably selected in the range of 15~25mm；For example, second transducer is symmetrically set in mould
9 right and lefts apart from nozzle 8 16mm, the position of 18mm, 22mm, 24mm etc..
The present embodiment additionally provides a kind of ultrasonic wave added powder based on the powder injection-molded device of above-mentioned ultrasonic wave added and notes
Penetrate forming method, the method using hydrogenation dehydrogenation titanium powder end (HDH) as powder stock, using paraffin (PW), polypropylene (PP),
, used as binding agent, powder volume charging ratio is 57% for Low Density Polyethylene (LDPE) and stearic acid (SA)；The method is specifically included
Following steps：
(1) knead：Hydrogenation dehydrogenation titanium powder end is placed in the banburying chamber 20 of banburying device, heating-up temperature is set as 150
DEG C, heat time heating time be one and a half hours；Polypropylene (PP), Low Density Polyethylene (LDPE) are added in banburying chamber 20 again, pressure
Press stone roller 19, start motor, rotor driven 18 is rotated, rotating speed 20r/min, time 10min；Ram 19 is then turned on, to banburying chamber
Paraffin (PW) is added in room 20, ram 19 is compressed, rotating speed is heightened to 50r/min, time 20min, left and right moment of torsion is stablized；Again finally
Add stearic acid (SA), rotating speed 80r/min, time 60min, left and right moment of torsion to stablize in banburying chamber 20, finally give uniform
Feeding without obvious agglomeration.Apply ultrasonic action in above mixing process, the supersonic generator drives first to change
Energy device drives injecting molding die to carry out supersonic vibration, and the signal frequency of the supersonic generator is 20KHZ.
(2) injection moulding：The feeding Jing injector that mixing is obtained is injected in the nozzle 8 of the injecting molding die, feeds
Material Jing nozzles 8 are entered in the die cavity 10 that upper mould 9, the matched moulds of lower mould 11 are formed, and carry out injection moulding, wherein, injection temperature is 150
DEG C, injection pressure is 100MPa, and the temperature of injection molding is 50 DEG C, and moulded blank is obtained Jing after molding；In the above process, surpass
Sonic generator drives second transducer 4 to drive injecting molding die to carry out supersonic vibration, the signal of the supersonic generator
Frequency is also 20KHZ.
(3) defat, sintering：Step (2) gained moulded blank is put into into degreasing sintered stove carries out defat, sintering, wherein taking off
The method that fat method is combined using solvent degreasing method and thermal debinding method, i.e., adopt trichloro ethylene solution defat at 50~60 DEG C
Carry out thermal debinding after 4h again, then sinter under 1250 DEG C of vacuum condition, finally give finished product.
Embodiment 2
The powder injection-molded device of ultrasonic wave added described in the present embodiment, including banburying device and Coinjection molding apparatus.
As shown in figure 1, the enclosure interior of banburying device 17 is provided with the banburying chamber 20 for containing mixed material, housing table
Face is provided with the material mouth communicated with banburying chamber 20；Rotor 18 is placed in banburying device banburying chamber 20, and pressure is provided with material mouth
Stone roller 19, ram 19 is suitable for sealing material mouth.By binding agent, according to a certain percentage a graded is added by material mouth with powder
Enter in the banburying chamber 20 of banburying device, sealed in material mouth pressure ram 19, rotated by rotor 18 and kneaded.
Two first transducers are arranged with the left and right side 8mm of banburying device banburying chamber 20 in the present embodiment, and
Two first transducers 21 are provided with the lower section 8mm of banburying device banburying chamber 20, first transducer 21 is occurred by ultrasound wave
Device is driven and in mixing process the vibrational energy of supersonic generator is passed directly in banburying chamber 20 by transducer 21,
Further improve the uniformity of feeding mixing.As deformable embodiment, when the first transducer 21 is symmetrically set in institute
When stating banburying device banburying 20 right and left of chamber, the distance between the first transducer and described banburying chamber 20 can also be
Any one value in the range of 2~10mm, and preferably selected in the range of 3~9mm, for example, first transducer difference
Located at the position of the right and left 4mm of banburying device banburying chamber 20,5mm, 6mm, 7mm etc..
The Coinjection molding apparatus in the present embodiment at least include screw of injection machine and injecting molding die；
As shown in Figure 2,3, the injecting molding die in the present embodiment includes：
Cover half device, including the cover half panel seat 7, solid plate 6 and upper mould 9 that are fixedly connected sequentially from top to bottom；
Die device, including lower mould 11, moving platen 3 and dynamic model panel seat 1, lower mould 11 is located at the underface of upper mould 9 and fixation
On moving platen 3, dynamic model panel seat 1 is arranged on the lower section of the moving platen 3, arranges between dynamic model panel seat 1 and moving platen 3
Flexible part, moving platen 3 is suitable for the mould 11 under drive under the deformation cooperation of elastic component carries out the reciprocating motion of vertical direction；
Die cavity 10 is formed on the binding face of the upper surface of the lower surface of upper mould 9 and lower mould 11；
Push rod 14, is fixedly connected with dynamic model panel seat 1, and moving platen 3 and lower mould 11 are provided with push rod passage, the push rod
Nesting is arranged in the passage of the push rod 14 and is suitable for being moved back and forth along push rod passage, the top of the push rod passage with
The bottom of the die cavity 10 is connected；Spring 13 is cased with outside push rod 14.
Sprue puller 12, through moving platen 3 and lower mould 11 sprue puller passage is additionally provided with, and the sprue puller nesting is arranged on institute
State in sprue puller passage and be suitable for being moved back and forth along the sprue puller passage, be connected with the bottom of the sprue puller 12 and set
It is equipped with cylinder；
Nozzle 8, nozzle 8 is arranged through cover half panel seat 7, solid plate 6 and upper mould 9, and the outlet of nozzle 8 is connected with die cavity 10
It is logical；
It is with mould difference commonly used in the art：Respectively set away from the 17mm of nozzle 8 in the symmetrical identity distance of upper mould 9
There is a second transducer 4, a second transducer is symmetrically respectively provided with the edge 5mm of die cavity 10 in the right and left of lower mould 11
4.Second transducer 4 by the vibrational energy of supersonic generator via upper mould 9, pass in the sprue die cavity of nozzle 8, and second
Transducer 4 is passed directly to the vibrational energy of supersonic generator in lower mould die cavity, further improves the uniformity of feeding mixing.
As variable embodiment, when the second transducer 4 is symmetrically set in lower 11 right and left of mould, the second transducer 4
Can select in the range of 2~10mm with the distance between the die cavity 10, any one value preferably in the range of 3~9mm, example
Such as, second transducer 4 is located at the position of the lower section 4mm of banburying device banburying chamber 20,6mm, 7mm, 8mm etc..
The present embodiment additionally provides a kind of ultrasonic wave added powder based on the powder injection-molded device of above-mentioned ultrasonic wave added and notes
Penetrate forming method, the method is using 316L powder of stainless steel as powder stock, common using paraffin (PW), ethene-vinyl acetate
, used as binding agent, powder volume charging ratio is 58%, the method for polymers (EVA), high density polyethylene (HDPE) (HDPE), stearic acid (SA)
Specifically include following steps：
(1) knead：316L powder of stainless steel is placed in the banburying chamber 20 of banburying device, 130 DEG C of heating-up temperature of setting,
One and a half hours time；Again ethylene-vinyl acetate copolymer (EVA), high density polyethylene (HDPE) (HDPE) are added into banburying chamber 20
In, ram 19 is compressed, start motor, rotor driven 18 is rotated, rotating speed 20r/min, time 10min；It is then turned on ram 19, Xiang Mi
Paraffin (PW) is added in refining chamber 20, ram 19 is compressed, rotating speed is heightened to 50r/min, time 20min, left and right moment of torsion is stablized；Most
Addition stearic acid (SA) in banburying chamber 20 again afterwards, rotating speed 80r/min, time 60min, left and right moment of torsion is stablized, is finally given
The uniform feeding without obvious agglomeration.Wherein, above mixing process applies ultrasonic action, and vibration signal is 20~40KHZ.
Used as one kind deformation of the present embodiment, raw material adds after metal dust and binding agent can be adopted dry-mixed as premix
Enter and kneaded in banburying device.
The method of the invention makes metal dust using the mechanical effect of ultrasonic activation in ultrasonic wave added mixing process
Granule and binding agent are subject to the percussion that the shear action and ultrasonic field of rotor applying apply simultaneously so that granule was being kneaded
Sufficiently disperseed in journey, effectively prevented the reunion of granule, simultaneously because the heat effect of ultrasonic activation, reduces feeding viscosity,
Such that it is able to be kneaded under low temperature, while preparing the more uniform feeding of dispersion.
(2) injection moulding：The feeding Jing injector that mixing is obtained is injected in the nozzle 8 of the injecting molding die, feeds
Material Jing nozzles 8 are entered in the die cavity 10 that upper mould 9, the matched moulds of lower mould 11 are formed, and carry out injection moulding, wherein, 150 DEG C of injection temperature,
Injection pressure 15MPa, injection molding temperature 50 C, obtains moulded blank；In the above process, supersonic generator drives second
Transducer 4 drives injecting molding die to carry out supersonic vibration.
The method of the invention introduces ultrasonic action in injection process, changes the rheological property of powder/polymeric system,
Melt viscosity is reduced, meanwhile, feeding particle diameter under resonant frequency therewith is sought by different transducers, make up to optimal
Effect such that it is able to which making the die cavity maximum pressure of powder injection-molded mold filling process has and significantly reduce, it is possible to achieve low
Injection pressure and injection temperature under complete Mold Filling Process in Injection Molding, filling capacity and products surface quality are improved, so as to widen powder
The injection molding scope of application in end, is particularly suited for being fed made by high useful load and erose metal or ceramic powders
Material.
(3) defat, sintering：Step (2) gained moulded blank is put into into degreasing sintered stove carries out hot taking off under the conditions of 500 DEG C
Fat, degreasing time 2h.
By the blank after defat in N2+H2Sinter under reducing atmosphere, sintering temperature curve is as shown in figure 4, with 5 DEG C/min
Speed is warming up to 500 DEG C, sinters 1 hour；Again 1350 DEG C are warming up to the speed of 10 DEG C/min, are sintered 1 hour, then at normal temperatures
Cooling, finally gives finished product.
Comparative example 1
The present embodiment prepares profiled member using conventional powders injection moulding method, raw material be hydrogenation dehydrogenation titanium powder end (HDH),
Binding agent adopts paraffin (PW), polypropylene (PP), Low Density Polyethylene (LDPE), stearic acid (SA), and powder volume charging ratio is
57%.The method specifically includes following steps：
(1) knead：Hydrogenation and dehydrogenization powder and binding agent are blended into 2h for 160 DEG C in kneading machine.
(2) injection moulding：The feeding Jing injector that mixing is obtained is injected in the nozzle 8 of the injecting molding die, feeds
Material Jing nozzles 8 are entered in the die cavity 10 that upper mould 9, the matched moulds of lower mould 11 are formed, and carry out injection moulding, wherein, 160 DEG C of injection temperature,
Injection pressure 110MPa, injection molding temperature 50 C, obtains moulded blank；
(3) defat, sintering：Step (2) gained moulded blank is combined using solvent degreasing method and thermal debinding method, 50~
Trichloro ethylene solution defat 4h is adopted at 60 DEG C, thermal debinding adopts vacuum degreasing sintering furnace with sintering, in 1250 DEG C of vacuum
Under the conditions of sinter, finally give finished product.
Embodiment 1 and comparative example 1 are to form processing to irregular metal powder titanium powder, by embodiment 1 and contrast
Example 1 is compared, and during the powder injection forming of embodiment 1, melting temperature, mixing time, injection temperature, injection pressure drop
Low, Jing steps (1) mixing gained feeding is improved without obvious agglomeration, the tensile strength of gained finished product.
Comparative example 2
The present embodiment prepares rustless steel profiled member using conventional method, and raw material is 316L powder of stainless steel, binding agent employing
Paraffin (PW), ethylene-vinyl acetate copolymer (EVA), high density polyethylene (HDPE) (HDPE), stearic acid (SA), powder volume is loaded
Rate is 58%.The method specifically includes following steps：
(1) knead：Powder of stainless steel is placed in the banburying chamber 20 of banburying device, 140 DEG C of heating-up temperature, time
120min；Ethylene-vinyl acetate copolymer (EVA), high density polyethylene (HDPE) (HDPE) are added in banburying chamber 20 again, compresses pressure
Stone roller 19, starts motor, and rotor driven 18 is rotated, rotating speed 20r/min, time 10min；Ram 19 is then turned on, to banburying chamber 20
Middle addition paraffin (PW), compresses ram 19, heightens rotating speed to 50r/min, and time 20min, left and right moment of torsion is stablized；It is last again to close
Add stearic acid (SA), rotating speed 80r/min, time 90min, left and right moment of torsion to stablize in refining chamber 20, obtain substantially homogeneous feeding
Material, portion has agglomeration in the feeding.
(2) injection moulding：The feeding Jing injector that mixing is obtained is injected in the nozzle 8 of the injecting molding die, feeds
Material Jing nozzles 8 are entered in the die cavity 10 that upper mould 9, the matched moulds of lower mould 11 are formed, and carry out injection moulding, wherein, 160 DEG C of injection temperature,
Injection pressure 20MPa, injection molding temperature 50 C, obtains moulded blank；
(3) defat, sintering：Step (2) gained moulded blank is put into into degreasing sintered stove carries out hot taking off under the conditions of 500 DEG C
Fat, degreasing time 2h.By the blank after defat in N2+H2Sinter under reducing atmosphere, sintering temperature curve is as shown in figure 4, with 5
DEG C/min speed is warming up to 500 DEG C, sinter 1 hour；Again 1350 DEG C are warming up to the speed of 10 DEG C/min, are sintered 1 hour, then
Cool down under room temperature, finally give finished product.
By embodiment 2 compared with comparative example 2, during the powder injection forming of embodiment 2, melting temperature, mixing time,
Injection temperature, injection pressure are reduced, and Jing steps (1) mixing gained feeding it is more uniform, without obvious agglomeration, gained into
The density of product more uniform, tensile strength is improved.
In the present invention, the powder volume charging ratio refers to that powder volume accounts for the percentage composition of feeding volume.
Obviously, above-described embodiment is only intended to clearly illustrate example, and not to the restriction of embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And the obvious change thus extended out or
Among changing the protection domain created still in this utility model.
Claims (11)
1. the powder injection-molded device of a kind of ultrasonic wave added, including：
Banburying device, the enclosure interior of the banburying device is provided with banburying chamber, and surface of shell is provided with and the banburying chamber phase
Logical material mouth；The banburying chamber is used to put powder stock and binding agent；Arrange in the banburying within the chamber of the banburying device
There is rotor, ram is provided with the material mouth, the ram is suitable for sealing the material mouth；
Coinjection molding apparatus, the Coinjection molding apparatus include screw of injection machine, injecting molding die, the banburying device banburying
Screw of injection machine described in gained feeding Jing injects the injecting molding die；
It is characterized in that：
First transducer is connected with the banburying device, the first transducer is provided with multiple, is injected into described
Pattern tool is connected with second transducer；The first transducer and the second transducer connect respectively with supersonic generator
Setting is connect, is suitable for driving the banburying device and the injecting molding die to carry out supersonic vibration respectively, glued with reducing feeding
Degree.
2. the powder injection-molded device of ultrasonic wave added according to claim 1, it is characterised in that be additionally provided with degreasing sintered
Equipment, is suitable for carrying out blank made by the injecting molding die defat, sintering.
3. the powder injection-molded device of ultrasonic wave added according to claim 1 and 2, it is characterised in that in banburying dress
On the housing put, at 2~10mm of the banburying chamber first transducer is provided with.
4. the powder injection-molded device of ultrasonic wave added according to claim 1, it is characterised in that the first transducer sets
Three are equipped with, respectively positioned at the lower section of the banburying chamber and symmetrical left and right side.
5. the powder injection-molded device of ultrasonic wave added according to claim 1 and 2, it is characterised in that the injection moulding
Mould includes：
Cover half device, including the cover half panel seat, solid plate and upper mould that are fixedly connected sequentially from top to bottom；
Die device, including lower mould, moving platen and dynamic model panel seat, the lower mould is located at the underface of the upper mould and fixed installation
On the moving platen, the dynamic model panel seat is arranged on the lower section of the moving platen, in the dynamic model panel seat and the moving platen
Between be provided with elastic component, the moving platen is suitable for driving the lower mould to carry out vertically in the case where the deformation of the elastic component coordinates
The reciprocating motion in direction；Die cavity is formed on the binding face of the upper surface of the lower surface and lower mould of mould on described；
Push rod, is fixedly connected with the dynamic model panel seat, and the moving platen and lower mould are provided with push rod passage, and the push rod is embedding
Be set in the push rod passage and be suitable for being moved back and forth along the push rod passage, the top of the push rod passage with
The bottom of the die cavity is connected；
Sprue puller, through the moving platen and lower mould sprue puller passage is additionally provided with, and the sprue puller nesting is arranged on the drawing
Material bar passage is interior and is suitable for being moved back and forth along the sprue puller passage, and with the bottom of the sprue puller gas is connected with
Cylinder；
Nozzle, the nozzle is through the setting of the cover half panel seat, solid plate and upper mould, the outlet of the nozzle and the die cavity phase
Connection；
The second transducer with supersonic generator connect setting is provided with the upper mould and/or lower mould.
6. the powder injection-molded device of ultrasonic wave added according to claim 5, it is characterised in that the distance in mould on described
The second transducing is respectively arranged with the 10~30mm of nozzle and in the lower mould at 2~10mm of die cavity edge described in distance
Device.
7. a kind of powder injection-molded side of ultrasonic wave added based on the powder injection-molded device of ultrasonic wave added described in claim 1
Method, it is characterised in that comprise the steps：
(1) knead：The banburying within the chamber that powder stock and binding agent are placed in the banburying device is kneaded, in mixing process
In, supersonic generator drives the plurality of first transducer to drive the banburying device to carry out supersonic vibration；
(2) injection moulding：The feeding Jing screw of injection machine that mixing is obtained injects the injecting molding die, is injected into
Type, obtains moulded blank；In the process of injection molding, supersonic generator drives the second transducer to drive the note
Penetrating mould carries out supersonic vibration, to reduce feeding viscosity.
8. the powder injection-molded method of ultrasonic wave added according to claim 7, it is characterised in that be additionally provided with step (3)：
The moulded blank is put into into degreasing sintered equipment carries out defat, sintering, obtains finished product.
9. the powder injection-molded method of ultrasonic wave added according to claim 7 or 8, it is characterised in that step (1) and step
(2) signal frequency of supersonic generator described in is 20~40KHZ per second.
10. the powder injection-molded method of ultrasonic wave added according to claim 7 or 8, it is characterised in that institute in step (2)
The process of injection molding stated includes matched moulds, injection, pressurize, cooling, die sinking operation.
The powder injection-molded method of 11. ultrasonic wave addeds according to claim 7 or 8, it is characterised in that the powder is gold
Category powder or ceramic powders.
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| CN105538486B (en) * | 2016-01-19 | 2019-03-15 | 深圳市商德先进陶瓷股份有限公司 | A kind of ceramic part injecting molding die and its injection moulding method |
| CN105856447A (en) * | 2016-05-13 | 2016-08-17 | 上海中化科技有限公司 | Inorganic filler and natural latex mixing equipment |
| CN109382507B (en) * | 2017-08-03 | 2020-01-31 | 全亿大科技（佛山）有限公司 | Preparation method of powder injection molding feed |
| CN107598170B (en) * | 2017-10-10 | 2023-05-05 | 顺德职业技术学院 | Method and apparatus for rapid mold injection molding of metal parts |
| EP3826792A1 (en) * | 2018-07-24 | 2021-06-02 | Straumann Holding AG | Powder injection molding apparatus |
| CN109551614B (en) * | 2018-10-11 | 2021-04-20 | 中国科学院宁波材料技术与工程研究所 | Ultrasonic device for powder compression molding |
| CN109226771A (en) * | 2018-11-20 | 2019-01-18 | 深圳艾利佳材料科技有限公司 | A kind of method that ultrasound plastics molding prepares metal product |
| CN109702192B (en) * | 2019-03-07 | 2021-04-13 | 攀枝花学院 | Method for preparing parts by quickly molding metal powder |
| CN109913865A (en) * | 2019-04-11 | 2019-06-21 | 山东开泰抛丸机械股份有限公司 | A kind of impeller head forward curve blade prepares mold mechanism and preparation method |
| CN113878113B (en) * | 2021-08-30 | 2023-05-02 | 广东省科学院新材料研究所 | Ceramic-stainless steel composite material and preparation method thereof |
| CN113798496A (en) * | 2021-09-16 | 2021-12-17 | 南京航空航天大学 | Feeding and micro-channel heat sink and preparation method and application thereof |
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| JP2000150283A (en) * | 1998-11-05 | 2000-05-30 | Bridgestone Corp | Injection molding method for resin mold |
| CN1176768C (en) * | 2003-02-21 | 2004-11-24 | 浙江大学 | Functional gradient material slip-casting formation preparation method in maynetostatic field |
| US20090208360A1 (en) * | 2008-02-20 | 2009-08-20 | The Boeing Company | Binderless metal injection molding apparatus and method |
| DE102008051622A1 (en) * | 2008-10-02 | 2010-04-08 | Roland Gschwinder | Producing a product by molding of liquid, pulpy, pasty, powdery, granular and/or solid material and/or its composition states using mold, comprises applying a periodic energy influence in the form of energy pulses with short time duration |
| CN101556863B (en) * | 2009-01-16 | 2011-07-20 | 华中科技大学 | Preparing method of nylon bonded Nd-Fe-B magnet |
| CN102528028B (en) * | 2012-03-02 | 2013-07-24 | 浙江大学宁波理工学院 | Automatic production method for compression moulding of powdered material and device adopted by same |
| CN102678798B (en) * | 2012-04-13 | 2015-08-05 | 江苏安捷汽车配件有限公司 | A kind of manufacture method of automobile brake sheet |
| CN103981436B (en) * | 2014-06-06 | 2015-11-04 | 海安县鹰球粉末冶金有限公司 | The manufacture method of metal powder injection molded high strength martensitic aging steel |
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