CN109590474B - Nozzle air pressure adjusting device capable of improving sealing performance - Google Patents
Nozzle air pressure adjusting device capable of improving sealing performance Download PDFInfo
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- CN109590474B CN109590474B CN201811538192.6A CN201811538192A CN109590474B CN 109590474 B CN109590474 B CN 109590474B CN 201811538192 A CN201811538192 A CN 201811538192A CN 109590474 B CN109590474 B CN 109590474B
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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
- 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 discloses a nozzle air pressure adjusting device capable of improving sealing performance, and belongs to the technical field of additive manufacturing. The method comprises the following steps: the device comprises a nozzle device and an air supply device, wherein the nozzle device mainly comprises a graphite crucible and comprises a lower sealing channel, a sensor cavity, a lower positioning hole, a spraying cavity, the graphite crucible and a spraying hole; the air supply device mainly comprises an upper air supply cover and comprises an air inlet, an adjusting screw, an air outlet, an upper positioning hole, a sensor threaded hole and an upper sealing channel. In the high-temperature metal droplet spraying process, the pneumatic type on-demand spraying device can realize the effect of stabilizing the pressure in the spraying cavity by a simple and quick sealing mode under the conditions that the sealing performance of the device is poor and the outlet air pressure is difficult to adjust, can also accurately adjust the outlet pressure and can meet the working requirements under different conditions.
Description
Technical Field
The invention relates to a nozzle air pressure adjusting device capable of improving sealing performance in a droplet jetting process, and belongs to the technical field of additive manufacturing.
Background
Metal droplet jetting additive manufacturing technology is a 3D printing technology developed based on the principle of inkjet printing. Based on the forming principle of 'discrete-superposition', liquid metal is controlled to generate uniform droplets, and then the droplets are deposited at specific positions of a substrate through the movement of the substrate, so that the droplets are piled up layer by layer point to form a complex three-dimensional solid structure. The technology has the advantages of simple process flow, low production cost, high density of formed parts, good mechanical property and the like, has wide application prospect in the fields of rapid forming of tiny metal parts, printing of flexible circuits, microelectronic packaging and the like, and particularly has obvious application advantages in the aspects of maintenance and replacement of tiny parts in special systems, manufacture of parts with complex structures, low material utilization rate or small batches and the like.
The existing non-metallic material droplet spraying technology is mature, but the characteristics of high melting point, high viscosity, high surface tension and the like of a metallic material make the existing non-metallic material spraying device and the control method difficult to be directly used for spraying and deposition forming of the metallic material. The existing pneumatic on-demand injection device is required to be carried out under high-temperature conditions, so that the sealing and adjusting device under a plurality of low-temperature conditions cannot be normally used, and higher requirements are put on the sealing conditions and material selection of the device. In order to improve the compactness of a formed part in the metal droplet jet additive manufacturing technology and reduce the surface roughness of the formed part, the accuracy of an experimental device needs to be further improved, the adjustment mode for controlling the generation parameters needs to be accurately controllable, and the metal droplets with smaller size, uniformity and stability can be further improved so as to improve the quality of the formed part.
At present, in the metal droplet ejection additive manufacturing technology, a pneumatic generation mode has a high requirement on sealing performance, and a device with good sealing effect and convenient adjustment is needed, so that the quality of a formed part is improved, and the development of the metal droplet ejection additive manufacturing technology is accelerated.
The present invention therefore proposes a nozzle air pressure regulating device for improved sealing performance during droplet ejection.
Disclosure of Invention
Aiming at the problems in the background technology, the invention provides a nozzle air pressure adjusting device for improving the sealing performance in the droplet jetting process, the device can improve the sealing performance when a pneumatic device jets, can conveniently adjust the outlet pressure, has important significance for overcoming the problems of difficult adjustment of high-temperature air pressure and the like in actual production, is simple to operate, has wide application range and higher scientific research application value, and adopts the following technical scheme:
the technical scheme adopted by the invention is that the nozzle air pressure adjusting device for improving the sealing performance in the droplet jetting process comprises a nozzle device and an air supply device, wherein the nozzle device comprises a lower sealing channel (7), a sensor cavity (8), a lower positioning hole (9), a jetting cavity (10), a graphite crucible (11) and a jet hole (12); the air supply device is an upper air supply cover (13), and the upper air supply cover (13) comprises an air inlet (1), an adjusting screw rod (2), an air outlet (3), an upper positioning hole (4), a sensor threaded hole (5) and an upper sealing channel (6).
The graphite crucible (11) is connected through bolts to fix the four upper positioning holes (4) and the four lower positioning holes (9) on the upper air supply cover (13), the upper sealing channel (6) is arranged on the inner wall of the upper air supply cover (13), and the lower sealing channel (7) is arranged on the inner wall of the upper air supply cover (13); the upper sealing channel (6) corresponds to the lower sealing channel (7).
High-temperature-resistant sealant is injected into an upper sealing channel (6) and a lower sealing channel (7) between the connecting surfaces of the graphite crucible (11) and the upper air supply cover (13); the spraying cavity (10) is arranged in the middle of the graphite crucible (11), the section of the spraying cavity (10) is of a conical structure, and the spraying cavity (10) is opposite to the air inlet (1); the spray hole (12) is positioned in the center of a boss at the bottom of the graphite crucible (11). An independent sensor cavity (8) is arranged in the graphite crucible (11), and a temperature sensor is placed in the sensor cavity (8). The upper air supply cover (13) is provided with a sensor threaded hole (5) for fixing a temperature sensor. The air inlet (1) is used for connecting an air inlet pipe and is communicated with the air outlet (3), and the air outlet (3) is matched with the adjusting screw rod (2) to realize the adjustment of the air output.
In the working process, air pressure pulse is applied to liquid high-temperature metal in the spraying cavity (10) through the upper air inlet, liquid at the outlet of the lower spraying hole (12) is extruded to overcome factors such as surface tension and the like to form metal micro-droplets, and the spraying process is finished. Meanwhile, the gas outlet (3) is matched with the adjusting screw rod (2) to adjust the gas output, so that the pressure adjustment under different experimental conditions can be met. The upper part is provided with a sensor access port which can observe the temperature change in the spraying cavity (10) in time.
In the metal droplet jetting additive manufacturing, higher requirements are provided for the sealing performance and the material performance of a pneumatic device under the high-temperature condition, the on-demand jetting device realizes the effect of droplet stable jetting through a simple and efficient high-temperature-resistant sealing glue sealing mode and a high-temperature-resistant air pressure adjusting device, the forming precision is effectively improved, and the working requirements under different conditions can be met.
Compared with the prior art, the invention has the following beneficial effects.
1. The invention has reasonable design, simple structure and convenient processing and installation, and is beneficial to improving the service life and the spraying effect of the whole device.
2. The device can solve the problems of poor sealing performance and the like under the high-temperature condition, the sealing performance is guaranteed through reasonable structural design, the operation is simple, and the device is convenient to use.
3. The nozzle structure is connected with the air supply device through the bolts and the sealant, the designed structure is convenient to replace, the problems of device blockage and the like can be effectively avoided, and the nozzle structure is convenient to maintain.
4. The device has been verified in the earlier stage that the change of the internal structure of the cavity to the air pressure pulse is greatly influenced, so that the built-in temperature sensor of the device is placed in a specific sensor cavity, the air pressure fluctuation in the molten metal cavity is reduced, and the deflection phenomenon after liquid drops are sprayed is avoided.
5. The adjusting screw rod that the gas outlet increases can bear the atmospheric pressure regulation work under the high temperature environment, improves life.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the gas supply apparatus of the present invention.
Figure 3 is a schematic view of a nozzle arrangement of the present invention.
Fig. 4 is a partial schematic view of an orifice of the present invention.
In the figure: 1. the gas inlet 2, the adjusting screw 3, the gas outlet 4, the upper positioning hole 5, the sensor threaded hole 6, the upper sealing channel 7, the lower sealing channel 8, the sensor cavity 9, the lower positioning hole 10, the spraying cavity 11, the graphite crucible 12, the spraying hole 13 and the gas supply cover.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
a) Because the stable atmospheric pressure in the cavity needs to be guaranteed, consequently have very high requirement to the leakproofness, will satisfy simultaneously and work under the high temperature condition, so adopt bolt-up and sealed gluey matched with mode to seal.
b) In order to reduce energy dissipation in the working process of the pneumatic nozzle and ensure the stability of the air pressure acting on the liquid level of the molten metal, the cone angle of the processed nozzle is less than 90 degrees, and the length-diameter ratio is 1.
c) In order to ensure the service life of the pneumatic nozzle and the nozzle, the materials are all made of high-temperature-resistant stainless steel.
d) In order to improve the injection effect of the pneumatic nozzle, the volume of the cavity of the spray cavity (10) is set to be a cylindrical cavity with the diameter of 20mm and the height of 50mm, the volume of the cavity can facilitate air pressure concentration, and the injection efficiency is improved.
e) The special pore channel of the temperature sensor with the diameter of 6 mm is arranged in the nozzle spraying cavity of the device, so that the device can contact measured molten metal and does not influence the pressure change in the cavity, and the generation of liquid drops can be promoted.
Claims (6)
1. A nozzle air pressure adjusting device capable of improving sealing performance is characterized in that: the device comprises a nozzle device and an air supply device, wherein the nozzle device comprises a lower sealing channel (7), a sensor cavity (8), a lower positioning hole (9), a spraying cavity (10), a graphite crucible (11) and a spraying hole (12); the air supply device is an upper air supply cover (13), and the upper air supply cover (13) comprises an air inlet (1), an adjusting screw rod (2), an air outlet (3), an upper positioning hole (4), a sensor threaded hole (5) and an upper sealing channel (6);
the graphite crucible (11) is connected through bolts to fix the four upper positioning holes (4) and the four lower positioning holes (9) on the upper air supply cover (13), the upper sealing channel (6) is arranged on the inner wall of the upper air supply cover (13), and the lower sealing channel (7) is arranged on the inner wall of the upper air supply cover (13); the upper sealing channel (6) corresponds to the lower sealing channel (7);
high-temperature-resistant sealant is injected into an upper sealing channel (6) and a lower sealing channel (7) between the connecting surfaces of the graphite crucible (11) and the upper air supply cover (13); the spraying cavity (10) is arranged in the middle of the graphite crucible (11), the section of the spraying cavity (10) is of a conical structure, and the spraying cavity (10) is opposite to the air inlet (1); the spray hole (12) is positioned in the center of a boss at the bottom of the graphite crucible (11); an independent sensor cavity (8) is arranged inside the graphite crucible (11), and a temperature sensor is placed in the sensor cavity (8); the upper air supply cover (13) is provided with a sensor threaded hole (5) for fixing a temperature sensor; the air inlet (1) is used for connecting an air inlet pipe and is communicated with the air outlet (3), and the air outlet (3) is matched with the adjusting screw rod (2) to realize the adjustment of the air output.
2. A nozzle air pressure adjusting apparatus capable of improving a sealing performance according to claim 1, wherein: in the working process, the upper air inlet applies air pressure pulse to the liquid high-temperature metal in the spraying cavity (10), and the liquid at the outlet of the lower spraying hole (12) is extruded to overcome surface tension factors to form metal micro-droplets, so that the spraying process is finished; meanwhile, the air outlet (3) is matched with the adjusting screw rod (2) to adjust the air outlet quantity, so that the pressure adjustment under different experimental conditions can be met; the upper part is provided with a sensor access port which can observe the temperature change in the spraying cavity (10) in time.
3. A nozzle air pressure adjusting apparatus capable of improving a sealing performance according to claim 1, wherein: in the metal droplet ejection additive manufacturing, higher requirements are put on the sealing performance and material performance of a pneumatic device under a high-temperature condition, and the effect of droplet stable ejection is realized through a high-temperature-resistant sealing glue sealing mode and a high-temperature-resistant air pressure adjusting device.
4. A nozzle air pressure adjusting apparatus capable of improving a sealing performance according to claim 1, wherein: the nozzle cone angle is less than 90 DEG and the length-diameter ratio is 1.
5. A nozzle air pressure adjusting apparatus capable of improving a sealing performance according to claim 1, wherein: the pneumatic nozzle and the nozzle are made of high-temperature-resistant stainless steel.
6. A nozzle air pressure adjusting apparatus capable of improving a sealing performance according to claim 1, wherein: the volume of the spraying cavity (10) is set to be a cylindrical cavity with the diameter of 20mm and the height of 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811538192.6A CN109590474B (en) | 2018-12-16 | 2018-12-16 | Nozzle air pressure adjusting device capable of improving sealing performance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811538192.6A CN109590474B (en) | 2018-12-16 | 2018-12-16 | Nozzle air pressure adjusting device capable of improving sealing performance |
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| Publication Number | Publication Date |
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| CN109590474A CN109590474A (en) | 2019-04-09 |
| CN109590474B true CN109590474B (en) | 2020-08-28 |
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| CN201811538192.6A Active CN109590474B (en) | 2018-12-16 | 2018-12-16 | Nozzle air pressure adjusting device capable of improving sealing performance |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0364424A (en) * | 1989-07-31 | 1991-03-19 | Sumitomo Electric Ind Ltd | Manufacture of aluminum-silicon-graphite alloy |
| CN101036946A (en) * | 2007-05-09 | 2007-09-19 | 哈尔滨工业大学 | Method and device for producing small solder alloys welding balls |
| CN102528062A (en) * | 2012-02-29 | 2012-07-04 | 上海应用技术学院 | Full-sealed gas atomization powder preparation device capable of preventing blockage of nozzle and flow guide tube caused by metal and alloy |
| CN107486347A (en) * | 2017-07-11 | 2017-12-19 | 北京工业大学 | A kind of drive device prepared for conducting liquid droplet |
| CN108380884A (en) * | 2018-03-02 | 2018-08-10 | 陈锦华 | 3d printing device |
| CN108838399A (en) * | 2018-07-19 | 2018-11-20 | 西北工业大学 | Homogeneous metal droplet varied angle steering injection apparatus and the method for printing high inclination-angle structural member using the device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376170B (en) * | 2007-08-31 | 2011-05-04 | 清华大学 | Equipment for manufacturing magnesium base-carbon nano tube compound material and method for producing the same |
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2018
- 2018-12-16 CN CN201811538192.6A patent/CN109590474B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0364424A (en) * | 1989-07-31 | 1991-03-19 | Sumitomo Electric Ind Ltd | Manufacture of aluminum-silicon-graphite alloy |
| CN101036946A (en) * | 2007-05-09 | 2007-09-19 | 哈尔滨工业大学 | Method and device for producing small solder alloys welding balls |
| CN102528062A (en) * | 2012-02-29 | 2012-07-04 | 上海应用技术学院 | Full-sealed gas atomization powder preparation device capable of preventing blockage of nozzle and flow guide tube caused by metal and alloy |
| CN107486347A (en) * | 2017-07-11 | 2017-12-19 | 北京工业大学 | A kind of drive device prepared for conducting liquid droplet |
| CN108380884A (en) * | 2018-03-02 | 2018-08-10 | 陈锦华 | 3d printing device |
| CN108838399A (en) * | 2018-07-19 | 2018-11-20 | 西北工业大学 | Homogeneous metal droplet varied angle steering injection apparatus and the method for printing high inclination-angle structural member using the device |
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| CN109590474A (en) | 2019-04-09 |
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