CN111136274A - Pressure difference driving type uniform metal droplet controllable spraying device facing space manufacturing - Google Patents
Pressure difference driving type uniform metal droplet controllable spraying device facing space manufacturing Download PDFInfo
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- CN111136274A CN111136274A CN202010132051.5A CN202010132051A CN111136274A CN 111136274 A CN111136274 A CN 111136274A CN 202010132051 A CN202010132051 A CN 202010132051A CN 111136274 A CN111136274 A CN 111136274A
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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
- B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
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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
- B22F3/003—Apparatus, e.g. furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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Abstract
The invention relates to a pressure difference driving type uniform metal droplet controllable jetting device for space manufacturing, belonging to the field of space metal 3D printing; the device comprises a spray head, a vacuum box body, a motion platform, a motor, a ball screw, a vacuum pump, a reducing cross joint, a feeding module, an inert gas source, a high-pressure needle valve, a piezoelectric ceramic driver and a pulse signal generator; the spray head and the vacuum box body are hermetically arranged; the motion platform and the ball screw are arranged in the vacuum box body, so that the scanning piece moves along an X axis, a Y axis and a Z axis in a plane; the reducing four-way valve comprises a box body electromagnetic valve, an air inlet electromagnetic valve and a feeding valve; the on-off of the pipeline of the vacuum pump is controlled by the box body electromagnetic valve and the air inlet electromagnetic valve, and the vacuum environment of the vacuum box body is adjusted; controlling the supply amount of the solid metal material in the feeding module through a feeding valve; the high-pressure needle valve is communicated with an inert gas source and is matched with a vacuum pump to control the pressure difference of the combined crucible and the vacuum box when the spray head sprays, so that uniform droplet spraying with controllable pressure difference is realized.
Description
Technical Field
The invention belongs to the field of space metal 3D printing, and particularly relates to a pressure difference driving type uniform metal droplet controllable jetting device for space manufacturing.
Background
The uniform metal droplet jetting technology is very suitable for metal piece in-situ additive manufacturing in space exploration activities due to the advantages of no need of specially-made raw materials, device integration, high unconstrained free forming precision and the like. However, most of the existing uniform metal droplet ejection deposition utilizes an inert gas environment to perform low-oxygen protection on the metal droplet ejection and deposition processes, and the used inert gas is a consumable material and is difficult to reduce supply dependence.
In document 1, "YAN Q, Yu H, WEI B, et al, vacuum counter-pressing casting technology [ J ]. The Chinese Journal of Nonferrous Metals,2008,6: 017", it is mentioned that vacuum differential pressure casting can improve The quality of The molded article. The solidification process of the crystal can be controlled by solidification feeding in the casting solidification process, so that the casting has compact structure and excellent performance. Vacuum differential pressure casting equipment is built in the literature, and the feeding speed at the crystal boundary is obtained by establishing a mathematical model of the casting solidification feeding process. The research obtains the main factors influencing the feeding speed and the feeding capacity and the relation between the pressure maintaining pressure and the density of the casting.
Patent [2] "qilehua, zhang, handsome, huangjiguang: the invention discloses a uniform metal droplet angle-variable direction-control spraying device and a method for printing a large-inclination-angle structural member by using the same, and provides an inclination angle printing and spraying device with strong practicability in the national invention patent publication No. CN 108838399A' of northwest industrial university. The device comprises a piezoelectric actuator, piezoelectric ceramics, a vibration transmission piece (rod and piece), a crucible (a material storage cavity and a material feeding cavity), a nozzle, a heating furnace and the like. The working principle of the device is that a metal material is melted in a crucible through a heating furnace to form a melt, inert gas is introduced into a feeding crucible, the melt is filled in a gap between a nozzle and a vibration transmission sheet, piezoelectric excitation droplet jet printing is realized by driving piezoelectric ceramics, and the working environment of the metal material is an inert gas low-oxygen environment of a glove box.
The experimental glove box transfers the nozzle filled with materials into the box body through the transition cabin, then the box body is heated until the solid materials are melted, the gas path pipeline in and out of the connecting box enables the inside of the nozzle to be communicated with the external inert gas, and the material feeding cavity is given back pressure so that the liquid is filled in the material storage crucible for injection. The glove box environment generation and maintenance depend on an external compressed gas tank and the consumption is large, so that the gas tank is replaced more frequently. Such an arrangement not only increases the apparatus volume and the number of experimental steps, but also does not enable continuous feeding.
The consumable material is required to be as less as possible for space manufacturing so as to be used for a long time, if the pressure difference between the inside and the outside of the crucible can be realized in a vacuum environment through a small amount of inert gas for spraying, the influence of oxidation reaction on the forming process can be avoided, the backpressure can be realized, the difficulty in spraying and printing the metal microdroplets uniformly in vacuum is greatly reduced, and the method is suitable for quick manufacturing in complex environments such as space and the like. When the material is metal, the device can only be used in a low-oxygen environment of a laboratory glove box, and the vacuum environment has strict requirements on device material consumption, sealing, volume quality and the like, so the device cannot be directly applied to the vacuum environment.
The invention provides a device for realizing metal droplet injection in a vacuum environment by controlling the pressure difference between a crucible cavity and the inside and the outside of a working environment. Quantitative inert gas is introduced into the crucible on the basis of vacuumizing the spraying environment and residual gas in the crucible, so that controllable differential pressure driven spraying is realized. The problem of space manufacturing consumptive material and device delivery very difficult is solved. Provides a feasible method for the rapid manufacturing of uniform metal droplet ejection in a complex environment.
Disclosure of Invention
The technical problem to be solved is as follows:
in order to avoid the defects of the prior art, the invention provides a differential pressure driving type uniform metal droplet controllable injection device for space manufacturing, which adopts a vacuum box body and a nozzle flange to be in sealing connection; the reducing four-way electromagnetic valve controls the feeding and air inlet and outlet paths; welding, compact flange threaded connection and bearing dynamic sealing to keep the sealing property inside the box body; a needle valve is used on the box body to control the pressure difference between the interior of the spray head and the environment of the vacuum box; so as to realize the uniform metal droplet ejection environment with controllable pressure difference.
The technical scheme of the invention is as follows: the invention provides a pressure difference driven uniform metal droplet controllable spraying device facing space manufacturing, which comprises a spray head 1, wherein the spray head comprises a combined crucible 2, a heating device and a nozzle, the combined crucible 2 comprises a transverse crucible and a vertical feeding crucible, the bottom of the vertical feeding crucible is communicated with the middle of the transverse crucible to form an inverted T-shaped structure, and the heating device is used for heating and melting a solid metal material in the combined crucible 2; the method is characterized in that: the device also comprises a vacuum box body 3, a motion platform 5, a motor 6, a ball screw 7, a vacuum pump 9, a reducing cross joint, a feeding module 13, an inert gas source 14, a high-pressure needle valve 15, a piezoelectric ceramic driver 16 and a pulse signal generator 17;
the sprayer 1 is hermetically arranged at an opening on one side wall of the vacuum box body 3, and the nozzle and the combined crucible 2 are positioned in the vacuum box body 3; the inlet of the vertical feeding crucible is hermetically connected with a through hole arranged on the top wall of the vacuum box body 3 and is used as a feeding and air inlet and outlet; the motion platform 5 is arranged on the inner wall of the vacuum box body 3 and is opposite to the nozzle, so that the scanning forming part can move along the X axis and the Y axis in a plane; the two ball screws 7 are arranged on two sides of the motion platform 5 in parallel, are parallel to the injection direction of the nozzle, and are driven by the motor 6 to realize that the scanning forming part moves along the Z axis, namely the injection direction of the nozzle;
the reducing four-way valve comprises a box body electromagnetic valve 10, an air inlet electromagnetic valve 11 and a feeding valve 12; the first port of the reducing four-way is communicated with the inlet of a vertical feeding crucible, the second port is communicated with a vacuum box body 3 through a box body electromagnetic valve 10, the third port is communicated with a vacuum pump 9 through an air inlet electromagnetic valve 11, the fourth port is communicated with a feeding module 13 through a feeding valve 12, and all the parts are connected with all the valves through vent pipelines; the on-off of the pipeline of the vacuum pump 9 is controlled by a box body electromagnetic valve 10 and an air inlet electromagnetic valve 11, so as to adjust the vacuum environment of the vacuum box body 3; controlling the supply of the solid metal material in the feeding module 13 through the feeding valve 12;
one end of the high-pressure needle valve 15 is communicated with a vent pipeline between the third port of the reducing cross and the air inlet electromagnetic valve 11 through the vent pipeline, and the other end of the high-pressure needle valve is communicated with an inert gas source 14, so that inert gas is introduced into the combined crucible 2, and the high-pressure needle valve is matched with the vacuum pump 9 to control the pressure difference between the combined crucible 2 and the vacuum box 3 when the spray head 1 sprays; the pulse signal generator 17 and the piezoelectric ceramic driver 16 are externally connected with the spray head 1 and used for driving the spray head 1 to spray.
The further technical scheme of the invention is as follows: the spray head 1 and the vertical feeding crucible are hermetically connected with the vacuum box body 3 through compact flanges 8.
The further technical scheme of the invention is as follows: the ball screw 7 and the vacuum box body 3 are connected through a ball bearing 4 to realize dynamic sealing.
The further technical scheme of the invention is as follows: the inert gas is argon.
The further technical scheme of the invention is as follows: the vent tube 304 is stainless steel.
The further technical scheme of the invention is as follows: the compact flange 8 and the vacuum box body 3 are made of alloy steel materials.
A use method of a pressure difference driving type uniform metal droplet controllable spraying device facing space manufacturing is characterized by comprising the following specific steps:
the method comprises the following steps: the spray head 1 is hermetically connected with the vacuum box body 3, and the inlet of the vertical feeding crucible of the combined crucible 2 is hermetically connected with the through hole on the top wall of the vacuum box body 3;
step two: opening a normally closed feeding valve 12 on a pipeline connecting the reducing four-way valve with the feeding module 13, and closing the box body electromagnetic valve 10 and the air inlet electromagnetic valve 11; continuous feeding is realized through a feeding device, a solid metal material directly slides into the combined crucible 2 through a pipeline, the solid material is heated and melted to be molten through the heating device, and the inert gas is introduced to generate back pressure so that the molten liquid is filled in the transverse crucible;
step three: closing a feeding valve 12, opening a box body electromagnetic valve 10 and an air inlet electromagnetic valve 11 which are connected with the vacuum box body 3 and a pipeline of the combined crucible 2, and opening a vacuum pump 9 to repeatedly extract the gas in the combined crucible 2 and the vacuum box body until an oxygen-free or low-oxygen environment is reached and the requirement of uniform droplet spraying protective atmosphere is met, or the device is directly connected with an external space vacuum environment;
step four: closing the vacuum valve 10 of the box body, opening a high-pressure needle valve 15 connected with a pipeline of an inert gas source 14, introducing inert gas in the injection process of the spray head 1, and controlling the inflow speed of the inert gas to realize the regulation and control of the pressure difference between the inside and the outside of the combined crucible 2 and the vacuum box 3; thereby realizing uniform droplet ejection printing in different environments;
step five: the piezoelectric driver 16 and the pulse generator 17 drive the spray head 1 to spray, and deposition printing is carried out by matching with the movement of the motion platform 5 and the ball screw 7.
The further technical scheme of the invention is as follows: the low-oxygen environment is that the oxygen content is less than or equal to 250 ppm.
Advantageous effects
The invention has the beneficial effects that: the invention designs a pressure difference driving type uniform metal droplet controllable jetting device for space manufacturing so as to realize vacuum 3D printing. The vacuum is adopted as the protective environment to reduce the requirement on the protective gas, the trace inert gas provides differential pressure to maintain the position of the molten metal in the nozzle, and the device has small volume and less material consumption and is convenient to transport to the outer space.
The problem of current protective gas device not be applicable to vacuum environment's limitation is solved, the device adopts the leakproofness design, reduce the demand to inert gas to only need to let in a small amount of back pressure gas to crucible inside can. The device adopts the structure that the injection device is connected with the vacuum box body to realize the metal droplet injection deposition environment. The feeding system and the air inlet and outlet system are combined through the reducing four-way valve. The environment in the crucible and the vacuum box body is vacuumized, and the pressure difference between the inside and the outside of the crucible is adjusted by combining a high-pressure needle valve and a vacuum pump, so that uniform droplet injection with controllable pressure difference is realized.
Drawings
FIG. 1 is a schematic diagram of a pressure differential controllable uniform droplet ejection shielding gas apparatus;
FIG. 2 is a composite reducing four-way module for feeding and gas inlet and outlet;
description of reference numerals: 1-spray head, 2-combined crucible, 3-vacuum box, 4-ball bearing, 5-motion platform, 6-motor, 7-ball screw, 8-compact flange, 9-vacuum pump, 10-box electromagnetic valve, 11-air inlet electromagnetic valve, 12-feeding valve, 13-feeding module, 14-inert gas source, 15-high pressure needle valve, 16-piezoelectric ceramic driver and 17-pulse signal generator.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
The invention relates to a differential pressure drive type uniform metal droplet controllable spraying device facing space manufacturing, which is designed in a sealing manner to keep droplet spraying and depositing in a gas environment with the vacuum degree of less than 10 Pa. High-purity argon is used as back pressure gas, the diameter of a vent pipe is 17mm, the length of the vent pipe is 140mm, the molar mass of the argon is 39.95g/mol, the ambient temperature is 300K, and the gas mass of only about 1.1 gamma 10 for realizing the pressure difference of 10Pa between the inside and the outside of the crucible under the vacuum condition can be calculated by using an ideal gas state equation-5g. Therefore, the pressure difference controllable injection device can be realized by carrying a small amount of inert gas.
Referring to fig. 1, the embodiment of the invention is composed of a spray head 1, a combined crucible 2, a vacuum box 3, a ball bearing 4, a moving platform 5, a motor 6, a ball screw 7, a compact flange 8, a vacuum pump 9, a box electromagnetic valve 10, an air inlet electromagnetic valve 11, a feeding valve 12, a feeding module 13, an inert gas source 14, a high-pressure needle valve 15, a pulse generator 16 and a piezoelectric driver 17. The nozzle 1 has a structure disclosed in "uniform metal droplet variable angle directional control ejection device" described in the national invention patent CN 108838399A. The spray head 1 is hermetically connected with the vacuum box body 3, the moving platform 5 is arranged on the inner wall of the vacuum box body 3 and is vertical to the spraying direction, the scanning forming of an X axis and a Y axis and the deposition height fixing of a Z axis are realized, and the moving platform 5 is connected with the ball screw 7 through a substrate supporting plate; two ball screws 7 are arranged on two sides of the moving platform 5 in parallel and are guaranteed to be parallel to the spraying direction of the nozzle, and a bearing dynamic seal 4 is adopted at the position of a screw external connection motor 6; the small vacuum pump 9 is convenient to carry; the first port of the reducing cross is connected with a vertical feeding crucible in the combined crucible 2 to realize feeding, protective atmosphere and pressure difference, the fourth port is connected with a feeding module 13, the third port is connected with an inert gas source 14 to add back pressure, the second port is connected with a vacuum box body 3, and the internal and external pressure difference of the combined crucible 2 is controlled by a high-pressure needle valve 15.
Referring to fig. 2, the reducing four-way structure is composed of a box body electromagnetic valve 10, an air inlet electromagnetic valve 11, a feeding valve 12, an air duct and a hoop.
The joints of the vent pipeline and the electromagnetic valve are both clamping type quick-release flanges and hoops. The main material of the vent pipe is 304 stainless steel which has good corrosion resistance, heat resistance, low-temperature strength and mechanical characteristics, good hot workability such as stamping, bending and the like, no heat treatment hardening phenomenon (the use temperature is-196 ℃ to 800 ℃), and good processability and weldability. The vertical part of the reducing four-way joint is determined according to the inner diameter of a vertical feeding crucible of the combined crucible 2, and the upper opening adopts a KF16 joint; the first port of the reducing cross joint is hermetically installed by adopting a flange matched with the vertical feeding crucible and is fixed by a group of 8 hexagon head bolts and hexagon nuts. The rest parts adopt KF joints. The selection of the materials of the flange and the vacuum box body 3 has excellent compression resistance and bending resistance, has certain high temperature resistance and corrosion resistance, and adopts alloy steel materials. The sealing O-shaped ring is made of high-temperature flexible material.
The invention realizes uniform droplet jet printing with pressure difference between the inside and the outside of the crucible under a vacuum environment. The present invention is described in detail below:
1) in order to control the precision of the pressure difference, the tightness of the device is ensured, and a welding process is used for machining the vacuum box. The device is connected with other components by adopting blind hole connection, flange sealing connection and dynamic sealing connection. The flange connection adopts O-shaped sealing rings for sealing, the O-shaped sealing rings are arranged in the grooves of the sealing rings, certain compression amount generates bounce force and transmits the bounce force to the sealing surfaces and the bottom surfaces of the grooves, the sealing surfaces are compressed only by small pressing force, the sealing effect can be achieved, and the bolts have the main function of connection.
2) The joints of the pipeline and the electromagnetic valve of the vacuum pipeline adopt clamping type quick-release flanges and clamps which meet the requirements of GB/T4982 and 2003. The vertical connecting part of the reducing cross and the feeding crucible adopts 16mm inner diameter according to the crucible inner diameter (17mm), the upper opening adopts a KF16 joint, and adopts a flange matched with the feeding crucible, and the flange is fixed by a group of M4 hexagon head bolts and hexagon nuts, the hexagon head bolts meet the requirements of GB/T5783 and 2000 materials, and the hexagon nuts meet the requirements of GB/T6170 and 2000 materials. The rest parts are designed according to the minimum diameter DN of 10mm which accords with the GB/T4982-2003 standard, and a KF10 joint is adopted. Because the sizes of the standard parts of the existing electromagnetic vacuum valves are overlarge, a small electromagnetic vacuum valve which can meet the requirements of the device and has low pressure bearing capacity is selected.
3) One end of the screw rod passes through the screw rod supporting seat, a framework type vacuum rubber sealing ring and a ball bearing (the inner diameter is 15mm, the outer diameter is 30mm) are arranged in the supporting seat, and the framework type vacuum rubber sealing ring is used for meeting the requirement of an internal vacuum environment. The part of the screw rod supporting seat extending out of the box body is connected with an output shaft of the stepping motor through a plum blossom coupling, and the other end of the screw rod supporting seat is matched with a ball bearing of the other screw rod supporting seat to enable the screw rod to stably rotate, so that a substrate supporting plate carrying a two-degree-of-freedom substrate motion platform is stably driven to move. The screw rod supporting seat is provided with a threaded hole which is connected with a blind hole in the vacuum cavity.
The differential pressure control is realized by a high-pressure UB needle valve in a harsh working environment, the valve body is made of 316 stainless steel, and the connection type is internal and external thread connection. The gas flow coefficient and the number of opening turns are linearly changed in a certain range, so that the environmental pressure in the vacuum box can be accurately controlled; and selecting a corresponding vacuum pump in consideration of no influence on the environment and the specific gas environment composition. The pressure difference driven type uniform metal droplet ejection controllable printing is realized through the above mode.
The use method of the pressure difference driven type uniform metal droplet controllable jetting device for space on-orbit 3D printing comprises the following specific steps:
the method comprises the following steps: the spray head 1 is hermetically connected with the vacuum box body 3, and the inlet of the vertical feeding crucible of the combined crucible 2 is hermetically connected with the through hole on the top wall of the vacuum box body 3;
step two: opening a normally closed feeding valve 12 on a pipeline connecting the reducing four-way valve with the feeding module 13, and closing the box body electromagnetic valve 10 and the air inlet electromagnetic valve 11; continuous feeding is realized through a feeding device, a solid metal material directly slides into the combined crucible 2 through a pipeline, the solid material is heated and melted to be molten through the heating device, and the inert gas is introduced to generate back pressure so that the molten is filled in the material storage crucible 2;
step three: closing a feeding valve 12, opening a box body electromagnetic valve 10 and an air inlet electromagnetic valve 11 which are connected with a vacuum box 3 and a pipeline of the combined crucible 2, opening a vacuum pump 9 to repeatedly extract gas in the combined crucible 2 and the vacuum box until an oxygen-free environment or a low-oxygen environment with the oxygen content less than or equal to 250ppm is achieved, and the requirement of uniform droplet spraying protective atmosphere is met, or the device is directly connected with an external space vacuum environment;
step four: closing the vacuum valve 10 of the box body, opening a high-pressure needle valve 15 connected with a pipeline of an inert gas source 14, introducing inert gas in the injection process of the spray head 1, and controlling the inflow speed of the inert gas to realize the regulation and control of the pressure difference between the inside and the outside of the combined crucible 2 and the vacuum box 3; thereby realizing uniform droplet ejection printing in different environments;
step five: the piezoelectric driver 16 and the pulse generator 17 drive the spray head 1 to spray, and deposition printing is carried out by matching with the movement of the motion platform 5 and the ball screw 7.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (8)
1. A pressure difference driving type uniform metal droplet controllable spraying device facing space manufacturing comprises a spraying head 1, wherein the spraying head comprises a combined crucible 2, a heating device and a nozzle, the combined crucible 2 comprises a transverse crucible and a vertical feeding crucible, the bottom of the vertical feeding crucible is communicated with the middle of the transverse crucible to form an inverted T-shaped structure, and the heating device is used for heating and melting solid metal materials in the combined crucible 2; the method is characterized in that: the device also comprises a vacuum box body 3, a motion platform 5, a motor 6, a ball screw 7, a vacuum pump 9, a reducing cross joint, a feeding module 13, an inert gas source 14, a high-pressure needle valve 15, a piezoelectric ceramic driver 16 and a pulse signal generator 17;
the sprayer 1 is hermetically arranged at an opening on one side wall of the vacuum box body 3, and the nozzle and the combined crucible 2 are positioned in the vacuum box body 3; the inlet of the vertical feeding crucible is hermetically connected with a through hole arranged on the top wall of the vacuum box body 3 and is used as a feeding and air inlet and outlet; the motion platform 5 is arranged on the inner wall of the vacuum box body 3 and is opposite to the nozzle, so that the scanning forming part can move along the X axis and the Y axis in a plane; the two ball screws 7 are arranged on two sides of the motion platform 5 in parallel, are parallel to the injection direction of the nozzle, and are driven by the motor 6 to realize that the scanning forming part moves along the Z axis, namely the injection direction of the nozzle;
the reducing four-way valve comprises a box body electromagnetic valve 10, an air inlet electromagnetic valve 11 and a feeding valve 12; the first port of the reducing four-way is communicated with the inlet of a vertical feeding crucible, the second port is communicated with a vacuum box body 3 through a box body electromagnetic valve 10, the third port is communicated with a vacuum pump 9 through an air inlet electromagnetic valve 11, the fourth port is communicated with a feeding module 13 through a feeding valve 12, and all the parts are connected with all the valves through vent pipelines; the on-off of the pipeline of the vacuum pump 9 is controlled by a box body electromagnetic valve 10 and an air inlet electromagnetic valve 11, so as to adjust the vacuum environment of the vacuum box body 3; controlling the supply of the solid metal material in the feeding module 13 through the feeding valve 12;
one end of the high-pressure needle valve 15 is communicated with a vent pipeline between the third port of the reducing cross and the air inlet electromagnetic valve 11 through the vent pipeline, and the other end of the high-pressure needle valve is communicated with an inert gas source 14, so that inert gas is introduced into the combined crucible 2, and the high-pressure needle valve is matched with the vacuum pump 9 to control the pressure difference between the combined crucible 2 and the vacuum box 3 when the spray head 1 sprays; the pulse signal generator 17 and the piezoelectric ceramic driver 16 are externally connected with the spray head 1 and used for driving the spray head 1 to spray.
2. A differential pressure driven uniform metal droplet controllable jetting apparatus for space-oriented manufacturing according to claim 1, characterized in that: the spray head 1 and the vertical feeding crucible are hermetically connected with the vacuum box body 3 through compact flanges 8.
3. A differential pressure driven uniform metal droplet controllable jetting apparatus for space-oriented manufacturing according to claim 1, characterized in that: the ball screw 7 and the vacuum box body 3 are connected through a ball bearing 4 to realize dynamic sealing.
4. A differential pressure driven uniform metal droplet controllable jetting apparatus for space-oriented manufacturing according to claim 1, characterized in that: the inert gas is argon.
5. A differential pressure driven uniform metal droplet controllable jetting apparatus for space-oriented manufacturing according to claim 1, characterized in that: the vent tube 304 is stainless steel.
6. A differential pressure driven uniform metal droplet controllable jetting apparatus for space-oriented manufacturing according to claim 1, characterized in that: the compact flange 8 and the vacuum box body 3 are made of alloy steel materials.
7. The use method of the pressure difference driven uniform metal droplet controllable spraying device facing the space manufacturing in claim 1 is characterized by comprising the following specific steps:
the method comprises the following steps: the spray head 1 is hermetically connected with the vacuum box body 3, and the inlet of the vertical feeding crucible of the combined crucible 2 is hermetically connected with the through hole on the top wall of the vacuum box body 3;
step two: opening a normally closed feeding valve 12 on a pipeline connecting the reducing four-way valve with the feeding module 13, and closing the box body electromagnetic valve 10 and the air inlet electromagnetic valve 11; continuous feeding is realized through a feeding device, a solid metal material directly slides into the combined crucible 2 through a pipeline, the solid material is heated and melted to be molten through the heating device, and the inert gas is introduced to generate back pressure so that the molten liquid is filled in the transverse crucible;
step three: closing a feeding valve 12, opening a box body electromagnetic valve 10 and an air inlet electromagnetic valve 11 which are connected with the vacuum box body 3 and a pipeline of the combined crucible 2, and opening a vacuum pump 9 to repeatedly extract the gas in the combined crucible 2 and the vacuum box body until an oxygen-free or low-oxygen environment is reached and the requirement of uniform droplet spraying protective atmosphere is met, or the device is directly connected with an external space vacuum environment;
step four: closing the vacuum valve 10 of the box body, opening a high-pressure needle valve 15 connected with a pipeline of an inert gas source 14, introducing inert gas in the injection process of the spray head 1, and controlling the inflow speed of the inert gas to realize the regulation and control of the pressure difference between the inside and the outside of the combined crucible 2 and the vacuum box 3; thereby realizing uniform droplet ejection printing in different environments;
step five: the piezoelectric driver 16 and the pulse generator 17 drive the spray head 1 to spray, and deposition printing is carried out by matching with the movement of the motion platform 5 and the ball screw 7.
8. The use according to claim 7, characterized in that: the low-oxygen environment is that the oxygen content is less than or equal to 250 ppm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113035674A (en) * | 2021-02-07 | 2021-06-25 | 上海精测半导体技术有限公司 | Multi-gas-source gas injection device |
| CN114131051A (en) * | 2021-11-25 | 2022-03-04 | 武汉轻工大学 | Metal melting extrusion deposition forming device and method |
| CN114619032A (en) * | 2020-12-10 | 2022-06-14 | 上海交通大学 | Ingot casting device used in gravity-free environment and application method thereof |
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