CN205270863U - Molten metal 3D prints shower nozzle - Google Patents
Molten metal 3D prints shower nozzle Download PDFInfo
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- CN205270863U CN205270863U CN201620000128.2U CN201620000128U CN205270863U CN 205270863 U CN205270863 U CN 205270863U CN 201620000128 U CN201620000128 U CN 201620000128U CN 205270863 U CN205270863 U CN 205270863U
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Abstract
The utility model relates to a molten metal 3D prints shower nozzle, it includes shower nozzle body and gas -pressure feed system, the shower nozzle body includes the air cavity casing, the inside piston that is provided with of air cavity casing, the piston rod of piston links to each other with piezoceramics and provides power, air cavity casing and casing base form the air cavity jointly, the left side processing of casing base has feedstock channel, feedstock channel's top is provided with the feed supplement mouth, the crucible is installed to the bottom of casing base, the outside of crucible is provided with the heater, the pedestal mounting of crucible has the crucible end cover, the crucible has the liquation chamber through crucible end cap seal, be provided with ceramic thin slice between liquation chamber and air cavity, the center processing of crucible end cover is provided with the nozzle, the right side processing of casing base has the air inlet, the gas -pressure feed system links to each other with the air inlet. Adopt this shower nozzle and printing method can make the droplet process of spraying can be in order there to be enough high frequency, driving pressure be adjustable the while, that is the injection quantity is adjustable.
Description
Technical field
The utility model relates to a kind of molten metal 3D printing head, espespecially a kind of with the jet-type molten metal 3D printing head of piston driven, belongs to Fast Forming Technique field.
Background technology
It is one of hot technology manufacturing field research at present that droplet type 3D prints, and this technology is by spraying printed material continuously with the form of droplet, and adds by stacking by the path of design, forms entity gradually. Wherein, adopt molten metal material to carry out droplet type 3D and print and belong to research one of focus and difficult point, main because molten metal temperature height, easily solidify, oxidizable, cause equipment (mainly shower nozzle) easily causing infringement and being difficult to safeguard.
Existing molten metal 3D printing head mainly adopts the forms such as inertia pressurized gas directly drives, pneumatic diaphragm driving, Piezoelectric Ceramic. But, owing to gas has obvious compressibility, directly adopt compressed air stream to drive its pressure of molten metal in shower nozzle to be difficult to control, frequency also is difficult to improve, and molten liquid " penetrate and wear " is easily only sprayed air-flow by gas; When adopting the form of pulse gas extruding flexible sheet to work, be by diaphragm along nozzle axis to small elastic deformation amount extrude molten liquid, extrusion capacity adjustable interval is little, and the temperature that can bear because of diaphragm and tired grade affect, it may also be useful to performance and life-span are all subject to a definite limitation; When adopting Piezoelectric Ceramic, being in fact utilize piezoelectric ceramics in the high frequency stretch/shrink of direction of polarization, drive the molten liquid of connected push rod extruding, the method is easy to adjustment print frequency, but cycle extrusion capacity almost can not regulate.
Practical novel content
The purpose of this utility model is to design a kind of molten metal 3D printing head, adopts this shower nozzle that droplet ejection process can be made namely can to have sufficiently high frequency, and driving pressure is adjustable simultaneously, that is emitted dose is adjustable.
In order to realize above-mentioned technology feature, the technology feature that the utility model adopts is: a kind of molten metal 3D printing head, it comprises head body and air pressure plenum system, described head body comprises air cavity housing, air cavity enclosure interior is provided with piston, the piston rod of piston is connected with piezoelectric ceramics provides power, air cavity housing and housing base form air cavity jointly, the left side of housing base is processed with feeding-passage, the top of feeding-passage is provided with material-feeding port, the bottom of housing base is provided with crucible, the outer setting of crucible has well heater, the floor installation of crucible has crucible end cap, crucible has molten sap cavity by crucible end cap seal, it is provided with ceramic sheet between molten sap cavity and air cavity, the center processing sets up of crucible end cap has nozzle, the right side of described housing base is processed with inlet mouth, described air pressure plenum system is connected with inlet mouth, described air pressure plenum system comprises loop of voltage regulation and pressure-control circuit, pressure-control circuit is connected with inlet mouth, loop of voltage regulation is connected with pressure-control circuit.
Described pressure-control circuit comprises check valve and surplus valve, and check valve is in parallel with surplus valve, and the left loop in loop in parallel is connected with air pressure inlet mouth, and right loop is connected with loop of voltage regulation.
Described loop of voltage regulation comprises air pump, Pneumatic unidirectional valve, gas-holder and safety valve, described gas-holder is connected with pressure-control circuit, Pneumatic unidirectional valve is installed after gas-holder, between Pneumatic unidirectional valve and gas-holder, is parallel with safety valve, after Pneumatic unidirectional valve, be connected with air pump.
The pressurized gas of described air cavity inside is helium.
Described material-feeding port is connected with feed supplement tank, and described feed supplement bucket inside is provided with air lift pump, it is possible to ensure that its air pressure inside is stablized.
The pressure unloading P1 of the safety valve in described loop of voltage regulation can ensure that having stable air pressure to export in loop makes it equal P1, when the pressure unloading P0 of the surplus valve in described pressure-control circuit can ensure to print, in air cavity, required peak pressure equals P0, true pressure P2 when certain moment in air cavity is greater than P0, off-load opened automatically by surplus valve, if P2 is less than P1, check valve is opened automatically to air cavity inflation, when regulating with setting pressure, need to ensure P1 < P0.
The upper surface that described ceramic sheet contacts with air cavity is asymmetric boss face, ceramic sheet is limited between the inlet mouth of air cavity and the feeding-passage of molten sap cavity, and small distance to-and-fro movement between the lower surface and the upper surface of crucible of air cavity housing vertically, when Piston Compression gas intracavity gas makes ceramic sheet move to molten sap cavity, molten liquid is squeezed, ceramic sheet blocks feeding-passage gradually, until it moves downward the upper surface that limit position arrives crucible, form a throttle orifice, prevent the molten liquid pressed from refluxing from feeding-passage; In piston Recovery Process, molten liquid enters molten sap cavity by throttle orifice, ceramic sheet moves to the lower surface with air cavity housing under the buoyancy of molten liquid and contacts, feeding-passage is opened gradually, now playing the effect cutting off air cavity and molten sap cavity, air cavity completes inflation simultaneously, for ensureing smooth feed supplement, the storage vat domestic demand being connected with material-feeding port keeps certain pressure P 3, setting P3=P1.
The utility model has following useful effect:
1, piezoelectric ceramics is adopted to carry out driven plunger, make use of piezoelectric ceramics efficiently can stretch by high frequency, thus realize droplet can the advantage of high frequency jet, thus ensure that the gas of air cavity inside can be compressed by piston, and then the metallic solution driving the molten sap cavity inside of ceramic sheet extruding sprays.
2, pressure-control circuit is passed through, working pressure during adjustable work, compensate for the defect that when employing piezoelectric ceramics-push rod direct-drive type prints, pressure is almost non-adjustable, simultaneously because piston does not directly contact with molten metal, molten liquid can not remain on piston and solidify, and is convenient to safeguard.
3, by setting ceramic sheet thus ensure that gas is not directly act on molten liquid, but transmit pressure by extruding the mode of ceramic sheet, make molten liquid by power evenly, reduce the possibility that in the printing of pressure gas directly driven formula, gas beam is too concentrated, easily penetrated from nozzle with airflow pattern, thus effectively avoid the defect of molten liquid " penetrated and wear ".
4, by filling helium in air cavity inside, helium, as rare gas element, while guaranteeing to be compressed by ceramic sheet, additionally it is possible to the defect such as avoid high temperature metal solution oxidized, plays the effect of protection gas, also has explosion-proof effect simultaneously.
5, by the molten metal of molten sap cavity inside being carried out computer heating control at well heater, certain temperature of fusion can be kept by the molten liquid in control chamber, it is ensured that molten liquid does not solidify in printing head.
6, stable atmospheric pressure value can be provided for air cavity by loop of voltage regulation and pressure-control circuit, thus play the effect of regulation and control air cavity internal pressure, ensure that air cavity is carried out in compression process by piston, it is possible to air pressure transmission is passed ceramic sheet and then is compressed by the molten metal of molten sap cavity inside.
7, the ladder structure design of ceramic sheet can realize the object to the inner tonifying Qi of air cavity, the object supplementing molten metal to molten sap cavity inside can also be realized simultaneously, matched with lower surface by left step surface, right step surface matches with upper surface, when Piston Compression gas intracavity gas makes ceramic sheet move to molten sap cavity, molten liquid is squeezed, ceramic sheet blocks feeding-passage gradually, until it moves downward the upper surface that limit position arrives crucible, form a throttle orifice, prevent the molten liquid pressed from refluxing from feeding-passage; In piston Recovery Process, molten liquid enters molten sap cavity by throttle orifice, and ceramic sheet moves to the lower surface with air cavity housing under the buoyancy of molten liquid and contacts, and feeding-passage is opened gradually, now plays the effect cutting off air cavity and molten sap cavity.
8, the force value of loop of voltage regulation and pressure-control circuit is passed through to regulate, it is possible to ensure molten sap cavity is carrying out molten metal one-tenth droplet in compression process, thus the molten liquid preventing it common is retracted after extruding, generation satellite drips, forms the defects such as jet.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Fig. 1 nozzle structure schematic diagram.
Fig. 2 feed supplement completes the local structure schematic diagram of ceramic sheet position view and ceramic sheet under state.
Fig. 3 is the vertical view of ceramic sheet structure in Fig. 2.
Fig. 4 shower nozzle workflow diagram.
In figure: 1, piston, 2, air cavity housing, 3, air cavity, 4, inlet mouth, 5, well heater, 6, crucible end cap, 7, molten sap cavity, 8, crucible, 9, material-feeding port, 10, ceramic sheet, 11, check valve, 12, surplus valve, 13, safety valve, 14, gas-holder, 15, Pneumatic unidirectional valve, 16, air pump, 17, housing base, 18, feeding-passage, 19, nozzle, 20, lower surface, 21, upper surface, 1001, left step surface, 1002, right step surface.
Embodiment
Below in conjunction with accompanying drawing, enforcement mode of the present utility model is described further.
See Fig. 1-3, a kind of molten metal 3D printing head, it comprises head body and air pressure plenum system, described head body comprises air cavity housing 2, air cavity housing 2 inside is provided with piston 1, the piston rod of piston 1 is connected with piezoelectric ceramics provides power, air cavity housing 2 and housing base 17 form air cavity 3 jointly, the left side of housing base 17 is processed with feeding-passage 18, the top of feeding-passage 18 is provided with material-feeding port 9, the bottom of housing base 17 is provided with crucible 8, the outer setting of crucible 8 has well heater 5, the floor installation of crucible 8 has crucible end cap 6, crucible 8 is sealed with molten sap cavity 7 by crucible end cap 6, it is provided with ceramic sheet 10 between molten sap cavity 7 and air cavity 3, the center processing sets up of crucible end cap 6 has nozzle 19, the right side of described housing base 17 is processed with inlet mouth 4, described air pressure plenum system is connected with inlet mouth 4, described air pressure plenum system comprises loop of voltage regulation and pressure-control circuit, pressure-control circuit is connected with inlet mouth 4, loop of voltage regulation is connected with pressure-control circuit.
Further, in order to avoid contacting between molten metal with piston, the method being filled with rare gas element is adopted between piston 1 and molten metal, pressure-driven ceramic sheet 10 and then press solution is produced by compression air cavity internal gas, and then realize the object of jet printing, contacted with molten metal by ceramic sheet 10 simultaneously, thus ensure that and accept balance.
Further, described pressure-control circuit comprises check valve 11 and surplus valve 12, and check valve 11 is in parallel with surplus valve 12, and the left loop in loop in parallel is connected with air pressure inlet mouth 4, and right loop is connected with loop of voltage regulation.
Further, described loop of voltage regulation comprises air pump 16, Pneumatic unidirectional valve 15, gas-holder 14 and safety valve 13, described gas-holder 14 is connected with pressure-control circuit, after gas-holder 14, Pneumatic unidirectional valve 15 is installed, between Pneumatic unidirectional valve 15 and gas-holder 14, it is parallel with safety valve 13, after Pneumatic unidirectional valve 15, it is connected with air pump 16.
Further, can ensure that the gaseous tension of air cavity 3 inside keeps stable by above-mentioned loop of voltage regulation and pressure-control circuit, when the gaseous tension of air cavity 3 inside reduces, it is possible to continue inflation by loop of voltage regulation to air cavity 3 inside and ensure the stable of its pressure.
Further, gas circuit due to the effect of check valve 11, is in closing condition in the compression stroke of piston 1, is used for sealed air-space; In the recovery stroke of piston, according to the size of air cavity inside true pressure, or inflation, or do not inflate; If air cavity good sealing effect, there is not gas leakage in compression stroke, then air cavity internal pressure P2 now should equal P1, and check valve is not opened; If there is gas leakage, this is P2 < P1 now, one-way valve opens, to air cavity tonifying Qi, until air cavity force value equals P1.
Further, the pressurized gas of described air cavity 3 inside is helium. Helium, as rare gas element, while guaranteeing to be compressed by ceramic sheet 10, additionally it is possible to the defect such as avoid high temperature metal solution oxidized, plays the effect of protection gas, also has explosion-proof effect simultaneously.
Further, described material-feeding port 9 is connected with feed supplement bucket, and described feed supplement bucket inside is provided with air lift pump, it is possible to ensure that its air pressure inside is stablized.
Further, the pressure unloading P1 of the safety valve 13 in described loop of voltage regulation can ensure that having stable air pressure to export in loop makes it equal P1, when the pressure unloading P0 of the surplus valve 12 in described pressure-control circuit can ensure to print, in air cavity 3, required peak pressure equals P0, when in air cavity 3, the true pressure P2 in certain moment is greater than P0, off-load opened automatically by surplus valve 12, if P2 is less than P1 check valve 11 and automatically opens and inflate to air cavity 3, regulating and during setting pressure, P1 < P0 need to be ensured.
Further, the upper surface that described ceramic sheet 10 contacts with air cavity 3 is asymmetric boss face, ceramic sheet 10 is limited between the inlet mouth 4 of air cavity 3 and the feeding-passage 18 of molten sap cavity 7, and small distance to-and-fro movement between the lower surface 20 and the upper surface 21 of crucible 8 of air cavity housing 2 vertically, when piston 1 compress gas in air cavity 3 ceramic sheet 10 is moved to molten sap cavity 7 time, molten liquid is squeezed, ceramic sheet 10 blocks feeding-passage 18 gradually, until it moves downward the upper surface 21 that limit position arrives crucible 8, form a throttle orifice, prevent the molten liquid pressed from refluxing from feeding-passage 18, in piston 1 Recovery Process, molten liquid enters molten sap cavity 7 by throttle orifice, ceramic sheet 10 moves to the lower surface 20 with air cavity housing 2 under the buoyancy of molten liquid and contacts, feeding-passage is opened gradually, now playing the effect cutting off air cavity and molten sap cavity, air cavity 3 completes inflation simultaneously, for ensureing smooth feed supplement, the storage vat domestic demand being connected with material-feeding port 9 keeps certain pressure P 3, setting P3=P1.
Further, described ceramic sheet 10 comprises left step surface 1001 and right step surface 1002, the ladder structure design of ceramic sheet 10 can realize the object to the inner tonifying Qi of air cavity 3, the object supplementing molten metal to molten sap cavity 7 inside can also be realized simultaneously, matched with lower surface 20 by left step surface 1001, right step surface 1002 matches with upper surface 21, when piston 1 compressed gas intracavity gas makes ceramic sheet move to molten sap cavity, ceramic sheet blocks feeding-passage 18 gradually, until it moves downward the upper surface 21 of limit position crucible, form a throttle orifice, prevent the molten liquid pressed from refluxing from material-feeding port, in piston 1 Recovery Process, molten liquid enters molten sap cavity by throttle orifice, and ceramic sheet moves to the lower surface 20 with air cavity housing 2 under the buoyancy of molten liquid and contacts, and feeding-passage is opened gradually, now plays the effect cutting off air cavity and molten sap cavity.
See Fig. 4, adopt the Method of printing of above-mentioned molten metal 3D printing head, it comprises the following steps, 1) debug process, when starting to debug, inflated to air cavity 3 by loop of voltage regulation, the pressure unloading simultaneously setting safety valve 13 is P1, and piston 1 compresses air cavity 3 internal gas under the driving of piezoelectric ceramics, makes air cavity 3 pressure be elevated to certain set(ting)value P0, hereafter piston continues extruding, under the effect of air cavity pressure, there is molten liquid to extrude from nozzle 19, if molten liquid is failed into drip, regulation relief valve 12 changes the size of P0, until printable evenly consistent droplet.
2) print procedure, after system is debugged, piston 1 is made to return to starting position, if in upper one-phase Piston Compression gas process, there is leakage in air cavity internal gas, then the force value of air cavity inside can be less than P1, now the gas in gas-holder 14 will enter air cavity through check valve 11 and automatically supplements, hereafter piston 1 compresses the gas of air cavity seal inside under the driving of piezoelectric ceramics, molten liquid is sprayed with droplet form, shower nozzle is moved by pre-designed path, and repeat above print procedure, can print continuously, if print frequency need to be regulated, only need to regulate the frequency of Piezoelectric Ceramics Excitation voltage.
Wherein, in step 1, air cavity 3 pressure is elevated to certain set(ting)value P0, and wherein the setup pressure value of P0 value and surplus valve 12 is equal.
Claims (7)
1. a molten metal 3D printing head, it is characterized in that: it comprises head body and air pressure plenum system, described head body comprises air cavity housing (2), air cavity housing (2) inside is provided with piston (1), the piston rod of piston (1) is connected with piezoelectric ceramics provides power, air cavity housing (2) and housing base (17) form air cavity (3) jointly, the left side of housing base (17) is processed with feeding-passage (18), the top of feeding-passage (18) is provided with material-feeding port (9), the bottom of housing base (17) is provided with crucible (8), the outer setting of crucible (8) has well heater (5), the floor installation of crucible (8) has crucible end cap (6), crucible (8) is sealed with molten sap cavity (7) by crucible end cap (6), ceramic sheet (10) it is provided with between molten sap cavity (7) and air cavity (3), the center processing sets up of crucible end cap (6) has nozzle (19), the right side of described housing base (17) is processed with inlet mouth (4), described air pressure plenum system is connected with inlet mouth (4), described air pressure plenum system comprises loop of voltage regulation and pressure-control circuit, pressure-control circuit is connected with inlet mouth (4), loop of voltage regulation is connected with pressure-control circuit.
2. a kind of molten metal 3D printing head according to claim 1, it is characterized in that: described pressure-control circuit comprises check valve (11) and surplus valve (12), check valve (11) is in parallel with surplus valve (12), the left loop in loop in parallel is connected with air pressure inlet mouth (4), and right loop is connected with loop of voltage regulation.
3. a kind of molten metal 3D printing head according to claim 1 or 2, it is characterized in that: described loop of voltage regulation comprises air pump (16), Pneumatic unidirectional valve (15), gas-holder (14) and safety valve (13), described gas-holder (14) is connected with pressure-control circuit, after gas-holder (14), Pneumatic unidirectional valve (15) is installed, between Pneumatic unidirectional valve (15) and gas-holder (14), it is parallel with safety valve (13), after Pneumatic unidirectional valve (15), it is connected with air pump (16).
4. a kind of molten metal 3D printing head according to claim 1, it is characterised in that: the inner pressurized gas of described air cavity (3) is helium.
5. a kind of molten metal 3D printing head according to claim 1, it is characterised in that: described material-feeding port (9) is connected with feed supplement tank, and described feed supplement bucket inside is provided with air lift pump, it is possible to ensure that its air pressure inside is stable.
6. a kind of molten metal 3D printing head according to claim 3, it is characterized in that: the pressure unloading P1 of the safety valve (13) in described loop of voltage regulation can ensure that having stable air pressure to export in loop makes it equal P1, and when the pressure unloading P0 of the surplus valve (12) in described pressure-control circuit can ensure to print, in air cavity (3), required peak pressure equals P0.
7. a kind of molten metal 3D printing head according to claim 1, it is characterized in that: the upper surface that described ceramic sheet (10) contacts with air cavity (3) is asymmetric boss face, ceramic sheet (10) is limited between the inlet mouth (4) of air cavity (3) and the feeding-passage (18) of molten sap cavity (7), and small distance to-and-fro movement between the lower surface (20) and the upper surface (21) of crucible (8) of air cavity housing (2) vertically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620000128.2U CN205270863U (en) | 2016-01-01 | 2016-01-01 | Molten metal 3D prints shower nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620000128.2U CN205270863U (en) | 2016-01-01 | 2016-01-01 | Molten metal 3D prints shower nozzle |
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| Publication Number | Publication Date |
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| CN205270863U true CN205270863U (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620000128.2U Expired - Fee Related CN205270863U (en) | 2016-01-01 | 2016-01-01 | Molten metal 3D prints shower nozzle |
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| Country | Link |
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| CN (1) | CN205270863U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499577A (en) * | 2016-01-01 | 2016-04-20 | 三峡大学 | 3D printing head for molten metal and printing method |
| CN106289419A (en) * | 2016-09-09 | 2017-01-04 | 三峡大学 | A kind of injection 3D prints flow estimation method |
| CN108515175A (en) * | 2018-05-08 | 2018-09-11 | 东南大学 | A kind of magnesium alloy slurry and its Method of printing |
-
2016
- 2016-01-01 CN CN201620000128.2U patent/CN205270863U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499577A (en) * | 2016-01-01 | 2016-04-20 | 三峡大学 | 3D printing head for molten metal and printing method |
| CN106289419A (en) * | 2016-09-09 | 2017-01-04 | 三峡大学 | A kind of injection 3D prints flow estimation method |
| CN106289419B (en) * | 2016-09-09 | 2019-07-02 | 三峡大学 | A kind of injecting type 3D printing flow estimation method |
| CN108515175A (en) * | 2018-05-08 | 2018-09-11 | 东南大学 | A kind of magnesium alloy slurry and its Method of printing |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160601 Termination date: 20170101 |
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| CF01 | Termination of patent right due to non-payment of annual fee |