CN209886681U - 3D printing apparatus cavity metal powder seal structure - Google Patents
3D printing apparatus cavity metal powder seal structure Download PDFInfo
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- CN209886681U CN209886681U CN201920691668.3U CN201920691668U CN209886681U CN 209886681 U CN209886681 U CN 209886681U CN 201920691668 U CN201920691668 U CN 201920691668U CN 209886681 U CN209886681 U CN 209886681U
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Abstract
The utility model provides a metal powder sealing structure of a 3D printing equipment cavity, which comprises a fixed seat body, a felted wool, a tension stress ring and an elastic split ring; a wool felt is sleeved in the step-shaped annular interval, so that the wool felt is tightly attached to the inner wall of the printing cavity; a tension stress ring is sleeved in the step-shaped annular interval; the inner surface of the tension stress ring is provided with a plurality of vertically arranged annular grooves; a plurality of elastic split rings are sleeved in the inner side of the tensioning stress ring, and each elastic split ring is embedded into the corresponding annular groove; through the elastic split ring and the tension stress ring, radial compensation force is applied to the wool felt, and sealing is further achieved. Has the following advantages: the powder sealing between the printing cavity and the power transmission cavity can be ensured, the power mechanism and the transmission mechanism can be ensured to move accurately, and the service lives of the power mechanism and the transmission mechanism are prolonged; in addition, when the device moves vertically, the friction vibration effect generated by friction is minimized, and the adverse effect of friction resonance is reduced.
Description
Technical Field
The utility model belongs to the technical field of metal powder laser melting vibration material disk makes, concretely relates to 3D printing apparatus cavity metal powder seal structure.
Background
The "3D printing" technology (known in the art as additive manufacturing technology) was generated in the united states of the last century in the 80 s, and the development of CAD (computer aided design), CNC (digital control), automatic control, laser, etc. techniques was the leading cause of its generation and was developed for less than 30 years to date. It is a manufacturing technology integrating light/machine/electricity, computer, numerical control and new material into one body. In the field, the technical gap between China and developed countries in the world is small, and the China and the developed countries in the world are almost positioned on the same starting line. So called additive manufacturing, this technique is known colloquially as the "3D printing" technique, by virtue of its "natural growth" into a three-dimensional entity by the layer-by-layer build-up of discrete materials such as powders, liquids, flakes, etc., unlike the traditional manufacturing process of "removal" of material such as cutting. The technology changes the integral forming of the three-dimensional entity into the superposition forming of a plurality of two-dimensional planes, thereby greatly reducing the manufacturing complexity. Theoretically, the technology can be applied to quickly change a design prototype into a real object without a cutter, a die and complex process conditions by using a structural model which can be designed on a computer. At present, the technology plays an important role in the fields of national defense, aerospace, automobiles, biomedicine, molds, casting, agriculture, household appliances, industrial art, animation and the like.
The development level of the future manufacturing industry is still one of the key marks for measuring the whole strength of a country, and the future manufacturing technology is necessarily digital and intelligent under the drive of the development of related technologies such as numerical control technology, computers, machinery, materials and the like. The development of the 3D printing technology, which is a prominent category of digitization and intelligence in the entire advanced manufacturing technology, can also profoundly affect the manufacturing industry as a whole at different levels. First, the field of application of the "3D printing" technology will continue to expand (breadth); secondly, the application level of the 3D printing technology in each application field is continuously deep (depth); moreover, the physical and chemical forms (equipment and process) of the 3D printing technology are more abundant. Therefore, the technology can gradually permeate into various fields such as national defense, aerospace, automobiles, biomedicine and the like, the design theory and concept of the fields are influenced, and other traditional technologies are matched to perfect and even update certain common manufacturing schemes, so that the manufacturing is more intelligent, simple and green, and the product performance is closer to an ideal state.
In the 3D printing technology industry, Selective Laser Melting (SLM) technology is at the high end, and is a Laser direct forming technology for metal parts with great development potential in the future.
In the selective laser melting work, the printing reference surface in the printing chamber needs to move up and down ceaselessly under the drive of the power mechanism and the transmission mechanism. However, in the prior art, because the powder sealing effect is poor, the powder on the printing reference surface is easy to leak downwards to the positions of the power mechanism and the transmission mechanism, so that the accurate movement of the power mechanism and the transmission mechanism is influenced, and the service lives of the power mechanism and the transmission mechanism are also reduced.
SUMMERY OF THE UTILITY MODEL
The defect to prior art exists, the utility model provides a 3D printing apparatus cavity metal powder seal structure can effectively solve above-mentioned problem.
The utility model adopts the technical scheme as follows:
the utility model provides a metal powder sealing structure of a 3D printing equipment cavity, which comprises a fixed seat body (1), a felted wool (2), a tension stress ring (3) and an elastic split ring (4);
the fixed base body (1) is coaxially arranged on the inner wall of the printing cavity, an equipment cavity is arranged below the fixed base body (1), and the fixed base body (1) is used for being connected with a transmission mechanism of the equipment cavity; the fixed seat body (1) comprises a transmission mechanism connecting piece (1.1) and a base assembly; the base assembly comprises a first cylindrical base (1.2), a second cylindrical base (1.3) and a third cylindrical base (1.4), wherein the first cylindrical base, the second cylindrical base and the third cylindrical base are sequentially arranged from bottom to top, and the diameters of the first cylindrical base and the third cylindrical base are gradually reduced; the edge of the first cylindrical base (1.2) is in fit contact with the inner wall of the printing cavity; step-shaped annular intervals are formed between the second cylindrical base (1.3) and the third cylindrical base (1.4) and the inner wall of the printing cavity;
the wool felt (2) is sleeved in the step-shaped annular interval, so that the wool felt (2) is tightly attached to the inner wall of the printing cavity; the tensioning stress ring (3) is sleeved in the step-shaped annular interval and positioned on the inner side of the wool felt (2); the inner surface of the tension stress ring (3) is provided with a plurality of vertically arranged annular grooves (3.1); a plurality of elastic split rings (4) are sleeved in the step-shaped annular interval and positioned at the inner side of the tension stress ring (3), and each elastic split ring (4) is embedded into the corresponding annular groove (3.1); and a radial compensation force is applied to the wool felt (2) through the elastic split ring (4) and the tension stress ring (3), so that sealing is realized.
Preferably, the device also comprises a fastening pressure plate (5);
the clamping pressure plate (5) has a clamping ring projection (5.1) adapted to the smallest diameter of the stepped annular gap; the fastening pressure plate (5) is located above the third cylindrical base (1.4) and a fastening ring projection (5.1) of the fastening pressure plate (5) is pressed into the stepped annular gap.
The utility model provides a 3D printing apparatus cavity metal powder seal structure has following advantage:
the powder sealing between the printing cavity and the power transmission cavity can be ensured, the power mechanism and the transmission mechanism can be ensured to move accurately, and the service lives of the power mechanism and the transmission mechanism are prolonged; in addition, when the device moves vertically, the friction vibration effect generated by friction is minimized, and the adverse effect of friction resonance is reduced.
Drawings
Fig. 1 is a schematic structural view of a metal powder sealing structure of a cavity of a 3D printing apparatus provided by the present invention;
fig. 2 is a schematic view of the arrangement of the fixed base according to the present invention;
fig. 3 is a schematic view of the tension stressed ring according to the present invention;
fig. 4 is a schematic view of a cross-sectional structure of the tension stressed ring provided by the present invention;
fig. 5 is a schematic half-sectional view of the tension stressed ring provided by the present invention;
fig. 6 is a schematic perspective view of the elastic split ring according to the present invention;
fig. 7 is a schematic top view of the elastic split ring according to the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The powder seal that the SLM printed is the must condition of guaranteeing the accurate motion of its power unit and drive mechanism, the utility model provides a 3D printing apparatus cavity metal powder seal structure, produced friction resonance problem when both having solved the powder seal problem and solving its vertical motion.
Referring to fig. 1 and 2, in order to ensure that the powder of the printing chamber and the power transmission chamber is sealed and ensure that the friction and vibration effect generated by the friction generated while the powder is sealed is minimized to achieve the movement precision with higher precision, the sealing importance of the metal powder of the cavity of the 3D printing device is particularly important when the metal powder is melted in the selective laser region, therefore, the utility model provides a metal powder sealing structure of the cavity of the 3D printing device, which comprises a fixed base 1, a wool felt 2, a tension stress ring 3 and an elastic split ring 4; the four functions of fixing, sealing, pressing and fastening are mainly realized.
Fixing: the inner wall of the printing cavity 6 is coaxially provided with a fixed seat body 1, an equipment cavity is arranged below the fixed seat body 1, and the fixed seat body 1 is used for being connected with a transmission mechanism of the equipment cavity; the fixed base body 1 is processed and connected to ensure the concentricity of the fixed base body and the cylinder body, so that the higher precision is achieved in the operation and transmission process of the fixed base body, the printing reference plane and the printing focal plane are more perfectly matched, and the high-precision processing condition of a printed piece is obtained.
The fixed base body 1 comprises a transmission mechanism connecting piece 1.1 and a base assembly; the base assembly comprises a first cylindrical base 1.2, a second cylindrical base 1.3 and a third cylindrical base 1.4 which are sequentially arranged from bottom to top and have gradually reduced diameters; moreover, the edge of the first cylindrical base 1.2 is in contact with the inner wall of the printing cavity in an attaching manner; step-shaped annular intervals are formed between the second cylindrical base 1.3 and the third cylindrical base 1.4 and the inner wall of the printing cavity;
sealing: as the printing reference surface continuously moves, the sealing mechanism ensures that the printing chamber and the power transmission chamber are sealed and the friction vibration effect generated by friction generated during sealing is minimum, and after a plurality of experiments, the industrial wool felt (the outer surface of which is treated and the radial friction coefficient of which is minimum) is selected. It has high corrosion resistance, high wear resistance, high temperature deformation resistance, high powder sealing performance and high surface precision metal sliding performance.
The wool felt 2 is sleeved in the step-shaped annular interval, so that the wool felt 2 is tightly attached to the inner wall of the printing cavity;
pressure: the industrial wool felt has certain ductility, a certain uniform pressure needs to be provided for the industrial wool felt, so that the sliding property of the industrial wool felt is not lost under the condition that the industrial wool felt is tightly attached to a cavity to achieve sealing, and the required pressure value is 0.25-0.35N/mm through calculation and experiments2And the tensioning stress ring 3 is used to make the industrial wool felt bear uniform axial force, so as to achieve the sealing condition of uniform stress.
Specifically, a tension stress ring 3 is sleeved in the step-shaped annular interval and positioned on the inner side of the wool felt 2; referring to fig. 3 to 5, which are schematic structural views of the tension stress ring, the inner surface of the tension stress ring 3 has a plurality of vertically arranged annular grooves 3.1; a plurality of elastic split rings 4 are sleeved in the step-shaped annular interval and positioned on the inner side of the tension stress ring 3, and referring to fig. 6-7, the elastic split rings are schematic structural views, and each elastic split ring 4 is embedded into a corresponding annular groove 3.1; through the elastic split ring 4 and the tension stress ring 3, radial compensation force is applied to the wool felt 2, and sealing is further realized.
Fastening: the sealing and elastic force are fixed, the fastening pressure can generate pressure on the industrial wool felt, the pressure is the radial compensation force of the axial force applied to the industrial wool felt, and the force range is 0.12-0.18N/mm2In order to ensure that the industrial wool felt is evenly stressed, the industrial wool felt needs to be installed according to the horizontal installation sequence during fastening.
Specifically, the device comprises a fastening pressure plate 5; the fastening pressure plate 5 has a fastening ring projection 5.1 matching the smallest diameter of the stepped annular gap; the tightening pressure plate 5 is located above the third cylindrical base 1.4 and the tightening ring projections 5.1 of the tightening pressure plate 5 are pressed into the stepped annular spaces.
Therefore, the utility model provides a 3D printing apparatus cavity metal powder seal structure has following advantage:
the powder sealing between the printing cavity and the power transmission cavity can be ensured, the power mechanism and the transmission mechanism can be ensured to move accurately, and the service lives of the power mechanism and the transmission mechanism are prolonged; in addition, when the device moves vertically, the friction vibration effect generated by friction is minimized, and the adverse effect of friction resonance is reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be viewed as the protection scope of the present invention.
Claims (2)
1. A metal powder sealing structure of a 3D printing equipment cavity is characterized by comprising a fixed base body (1), a wool felt (2), a tension stress ring (3) and an elastic split ring (4);
the fixed base body (1) is coaxially arranged on the inner wall of the printing cavity, an equipment cavity is arranged below the fixed base body (1), and the fixed base body (1) is used for being connected with a transmission mechanism of the equipment cavity; the fixed seat body (1) comprises a transmission mechanism connecting piece (1.1) and a base assembly; the base assembly comprises a first cylindrical base (1.2), a second cylindrical base (1.3) and a third cylindrical base (1.4), wherein the first cylindrical base, the second cylindrical base and the third cylindrical base are sequentially arranged from bottom to top, and the diameters of the first cylindrical base and the third cylindrical base are gradually reduced; the edge of the first cylindrical base (1.2) is in fit contact with the inner wall of the printing cavity; step-shaped annular intervals are formed between the second cylindrical base (1.3) and the third cylindrical base (1.4) and the inner wall of the printing cavity;
the wool felt (2) is sleeved in the step-shaped annular interval, so that the wool felt (2) is tightly attached to the inner wall of the printing cavity; the tensioning stress ring (3) is sleeved in the step-shaped annular interval and positioned on the inner side of the wool felt (2); the inner surface of the tension stress ring (3) is provided with a plurality of vertically arranged annular grooves (3.1); a plurality of elastic split rings (4) are sleeved in the step-shaped annular interval and positioned at the inner side of the tension stress ring (3), and each elastic split ring (4) is embedded into the corresponding annular groove (3.1); and a radial compensation force is applied to the wool felt (2) through the elastic split ring (4) and the tension stress ring (3), so that sealing is realized.
2. The 3D printing device cavity metal powder sealing structure according to claim 1, further comprising a fastening pressure plate (5);
the clamping pressure plate (5) has a clamping ring projection (5.1) adapted to the smallest diameter of the stepped annular gap; the fastening pressure plate (5) is located above the third cylindrical base (1.4) and a fastening ring projection (5.1) of the fastening pressure plate (5) is pressed into the stepped annular gap.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920691668.3U CN209886681U (en) | 2019-05-14 | 2019-05-14 | 3D printing apparatus cavity metal powder seal structure |
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| CN201920691668.3U CN209886681U (en) | 2019-05-14 | 2019-05-14 | 3D printing apparatus cavity metal powder seal structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021114543A1 (en) | 2021-06-07 | 2022-12-08 | Trumpf Laser- Und Systemtechnik Gmbh | Gasket for a building cylinder, building cylinder and machine with a building cylinder |
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2019
- 2019-05-14 CN CN201920691668.3U patent/CN209886681U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021114543A1 (en) | 2021-06-07 | 2022-12-08 | Trumpf Laser- Und Systemtechnik Gmbh | Gasket for a building cylinder, building cylinder and machine with a building cylinder |
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