CN114799230A - Small titanium alloy additive manufacturing atmosphere protection device and using method thereof - Google Patents
Small titanium alloy additive manufacturing atmosphere protection device and using method thereof Download PDFInfo
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- CN114799230A CN114799230A CN202210433304.1A CN202210433304A CN114799230A CN 114799230 A CN114799230 A CN 114799230A CN 202210433304 A CN202210433304 A CN 202210433304A CN 114799230 A CN114799230 A CN 114799230A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 50
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 49
- 239000000654 additive Substances 0.000 title claims abstract description 46
- 230000000996 additive effect Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title abstract description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000001816 cooling Methods 0.000 claims abstract description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000001301 oxygen Substances 0.000 claims abstract description 34
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 34
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052786 argon Inorganic materials 0.000 claims abstract description 16
- 238000004372 laser cladding Methods 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims description 36
- 238000007789 sealing Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000003292 glue Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000005253 cladding Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract 1
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- 238000011160 research Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
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- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 206010003497 Asphyxia Diseases 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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Images
Classifications
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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
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/70—Gas flow means
-
- 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
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/20—Cooling means
-
- 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
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/90—Means for process control, e.g. cameras or sensors
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a small titanium alloy additive manufacturing atmosphere protection device and a using method thereof, and belongs to the technical field of additive manufacturing. The device comprises an acrylic box body, a flow control box and a PLC control box, wherein a water cooling device, a substrate, a laser cladding instrument and an oxygen concentration detector are arranged in the acrylic box body; the oxygen concentration detector is fixed on the inner wall of the acrylic box body and is connected with the PLC control box through a signal wire; the ring pipeline is connected with the flow control box, and the PLC control box receives oxygen concentration content data from the oxygen concentration detector and adjusts the argon flow input from the flow control box to the ring pipeline. The device can control the oxygen concentration content near the additive manufacturing area within a reasonable range, so that the whole closed environment can keep a micro-positive pressure state, and the waste of excessive argon gas is avoided.
Description
Technical Field
The invention relates to an atmosphere protection device for additive manufacturing, in particular to a small titanium alloy atmosphere protection device for additive manufacturing and a using method thereof.
Background
The titanium alloy has the advantages of high specific strength, high corrosion resistance, excellent performance at high temperature, good biocompatibility and the like, and is widely applied to the fields of aerospace, marine ships, biomedicine and the like; however, because the titanium alloy has poor heat conductivity, heat is easy to accumulate at the tip of the tool during machining, and the surface rebounds greatly during machining, so that the phenomenon of tool sticking is easy to occur, and the machining performance of the titanium alloy is inferior to that of steel and aluminum alloy materials. In the aerospace field, titanium alloys are important metal structural members, such as titanium alloy airplane frame beam structures; however, in the actual manufacturing process, due to the above-mentioned difficult workability of titanium alloy, several months are required to manufacture a large titanium alloy structural member. Titanium alloy additive manufacturing technology has been developed vigorously in recent years, and research on titanium alloy additive manufacturing is vigorously carried out in all universities and scientific research institutes.
At normal temperature, a layer of compact oxide film is generated on the surface of the titanium alloy, so that the corrosion resistance of the titanium alloy is excellent, but at high temperature, the titanium alloy is easy to react with oxygen in the air, so that the titanium alloy is not beneficial to additive manufacturing of the titanium alloy in the atmospheric environment, and a large number of tissue defects and pore defects are generated. Laser additive manufacturing of titanium alloys requires that the oxygen concentration be reduced to a certain level, typically below 100 ppm. In order to reduce the oxygen concentration in the additive manufacturing process to a certain range, a sealed environment needs to be used, and the oxygen concentration in the environment is generally reduced by filling argon into the sealed environment. The larger the volume of the closed environment, the larger the size of the additive manufacturing part, but the more time is consumed by a single inflation and the more argon gas is required to be continuously introduced for maintaining the atmosphere environment.
At present, a part of large enterprises exist in China, an atmosphere protection cabin body for additive manufacturing of large titanium alloy components is available, the main application range of the atmosphere protection cabin body is additive manufacturing of the large titanium alloy components, the total volume of the cabin body is more than 60 cubic meters, the atmosphere protection cabin body is long in inflation time, and the argon consumption is large. For the research on titanium alloy additive manufacturing still in the starting and exploring stages, the large-scale closed environment protection cabin body is not applicable, and the cost of a single experiment is too high. For research work in laboratories of colleges and universities, additive manufacturing of small samples is usually performed on small test plates, and the cost required for building a large-volume environment-friendly sealed cabin is very high, so it is urgently needed to design a small sealed environment cabin for additive manufacturing of titanium alloy to reduce the cost of the experiment.
Chinese patent application No. 201910479760.8 (publication No. CN 110153420 a), entitled "titanium alloy protection cabin device and laser additive manufacturing method", proposes a titanium alloy atmosphere protection device and laser additive manufacturing method, which comprises a circular workbench, a fixing plate, a substrate, and a thin film. The device's circular table surface is last to be provided with 8T type grooves and T type slider to fixed plate and base plate and circular table are fixed through the bolt, and around and the top then encircle with 0.3 mm's high temperature resistant film and support iron stand, the top is closely laminated six-axis linkage robotic arm and film with sealed glue, the lower extreme compresses tightly the film outside through the rubber circle and laminates with circular table, and presss from both sides tight iron stand through the fixation clamp.
The sealing material adopted by the invention is a high-temperature-resistant film with the thickness of 0.3mm, the splashing of high-temperature metal powder in the additive manufacturing process can certainly impact the film on the top and the side, and under the condition of long-time and high-power titanium alloy additive manufacturing, the reliability of the sealing device is not high, and the risks of film cracking and air leakage can occur. The invention adopts the structural parts of an iron frame, a fixed frame, a film and a rubber ring, undoubtedly influences the matching relation among the parts in the process of repeated movement operation of the six-axis linkage printing laser head, the whole strength of the device is not high, and once the matching relation among the structural parts is changed, a plurality of air leakage points are easy to generate.
Disclosure of Invention
The invention aims to provide a small titanium alloy additive manufacturing atmosphere protection device and a using method thereof.
In order to achieve the above object, the technical solution of the present invention is as follows:
a small titanium alloy additive manufacturing atmosphere protection device is characterized by comprising an acrylic box body, a flow control box and a PLC control box, wherein a water cooling device, a substrate, a laser cladding instrument and an oxygen concentration detector are arranged in the acrylic box body; the oxygen concentration detector is fixed on the inner wall of the acrylic box body and is connected with the PLC control box through a signal wire; the annular pipeline is connected with the flow control box, and the PLC control box receives oxygen concentration content data from the oxygen concentration detector and adjusts the argon flow input from the flow control box to the annular pipeline.
Further, the ya keli box is placed on work platform, the last mobile device that is provided with of work platform, mobile device includes x axle actuating mechanism and y axle actuating mechanism and z axle actuating mechanism, and x axle actuating mechanism sliding connection just spanes in ya keli box top on work platform, and y axle actuating mechanism sliding connection is on x axle actuating mechanism, and z axle actuating mechanism sliding connection is on y axle actuating mechanism.
Furthermore, the laser cladding instrument is connected on z axle actuating mechanism through the fixed plate, and the laser cladding instrument is including having accessed the laser head of laser transmission optic fibre, the laser head below is installed and is cladded the head.
Furthermore, the inside of water cooling plant has the circulation runner to be used for right the base plate cools off, the last circulating pipe that is equipped with of water cooling plant, circulating pipe pass through the aperture and the external connection of seting up on the ya keli box.
Further, ya keli box top is equipped with the safety cover, the safety cover passes through glue and bonds at ya keli box top, and the center department of safety cover is provided with the hole that the outer wall that holds the laser head passed, and the hole of safety cover passes through rubber seal to be fixed in the outer wall department of laser head, makes the upper portion of yakeli box seal.
Further, have the transparent observation board of a detachable connection on the lateral wall of ya keli box, seted up one on the lateral wall of ya keli box and held just the mounting groove of transparent observation board, transparent observation board is installed seal the yakeli box in the mounting groove.
Furthermore, the bottom of the acrylic box body is provided with a bottom plate, the bottom plate is positioned below the water cooling device, and heat dissipation holes are uniformly formed in the bottom plate.
Furthermore, the annular pipeline is clamped on the inner wall of the acrylic plate through a pipeline fixer.
The invention also provides a using method of the small titanium alloy additive manufacturing atmosphere protection device, which is characterized by comprising the following steps of:
s1, placing the open acrylic box body on the table top of the working platform, placing the bottom plate at the bottom of the acrylic box body, placing the water cooling device at a proper position on the bottom plate, introducing a circulating water pipe of the water cooling device to the outside through a hole formed in the acrylic box body, and placing the substrate above a base of the water cooling device;
s2, fixing the oxygen concentration detector on the inner wall of the acrylic box body, and introducing a signal wire to the outside to be connected with a PLC control box;
step S3, adjusting the laser head to a proper position through a moving device on the working platform, connecting the periphery of the protective cover and the inner wall of the top end of the acrylic box body through gluing, penetrating a hole in the center of the protective cover through the laser head, and sealing by using a rubber sealing ring;
step S4, connecting the annular pipeline with a flow control box through a pipeline, and sealing the hole gap position on the acrylic box body by using an air-proof sealant;
and step S5, opening a valve of the flow control box, filling argon into the acrylic box body through an annular pipeline, opening a circulating system of the water cooling device after the oxygen concentration content is reduced to a proper concentration, and performing titanium alloy additive manufacturing by using the integrated laser cladding system.
In summary, the invention has the following advantages:
1. the device of the invention avoids the problems of high equipment cost, high use cost and the like caused by the establishment of a large-scale environment protection cabin; the problem of atmosphere protection of titanium alloy additive manufacturing in laboratories of colleges and universities is solved, and the research on the relation between the process, the organization and the performance of the titanium alloy additive manufacturing technology can be realized at low cost and high efficiency by scientific research personnel;
2. the device disclosed by the invention is small in size, and can reduce the oxygen concentration of the whole environment to a reasonable range in a short time, so that the time required by an inflation link is saved, and the progress of an experiment is accelerated; meanwhile, the safety of operators is greatly improved due to the smaller environmental protection cabin, accidents (such as suffocation) are reduced, and potential safety hazards are reduced;
3. the device has a simple structure, is easy to disassemble, and can be used for atmosphere protection of different fields and different processing platforms;
4. the device has better integral structure rigidity, and the box body made of acrylic transparent plastic can observe the processing condition in the environmental chamber in real time and make corresponding adjustment, so that the air leakage risk of the device is lower;
5. according to the device, the annular pipeline is uniformly distributed with the air holes, so that the argon can be uniformly filled;
6. according to the device, the oxygen concentration detector is connected with the PLC control box through the signal line, and the control program is implanted into the PLC control box and can adjust the flow control box at the air inlet, so that the oxygen concentration content in the closed environment is controlled in a reasonable range, the requirement on the oxygen concentration content during the titanium alloy additive manufacturing is met, and the increase of the production and manufacturing cost due to excessive argon gas filling is avoided.
Drawings
FIG. 1 is an overall schematic view of the present invention;
FIG. 2 is an exploded view of the installation of the atmosphere protection device;
FIG. 3 is a top view of the atmosphere protection device;
FIG. 4 is an enlarged schematic view of the acrylic box body hidden in FIG. 1;
FIG. 5 is an enlarged view of the black dashed box of FIG. 4;
in the figure, the position of the upper end of the main shaft,
1.1, work platform, 1.2, y axle actuating mechanism, 1.3, z axle actuating mechanism, 1.4, laser head, 1.5, laser transmission optical fiber, 1.6, x axle actuating mechanism, 2.1, ya keli box, 2.2, ring conduit, 2.4, safety cover, 2.5, transparent observation plate, 2.6, pipeline fixer, 2.7, oxygen concentration detector, 2.8, coupling, 3.1, bottom plate, 3.2, water cooling plant, 3.3, base plate, 3.4, circulating pipe, 4.1 flow control box, 4.2, PLC control box.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "vertical", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements that are referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Some of the terminologies found in the present invention are explained.
The micro positive pressure refers to that in a closed environment, the air pressure of the internal environment is slightly higher than that of the external atmospheric environment, so that the air flows from the inside to the outside all the time, and the external impurity gas is prevented from entering the closed environment.
1ppm refers to one-million of the gas concentration content.
PLC is an abbreviation of programmable Logic Controller (program Logic Controller).
The invention provides a small titanium alloy additive manufacturing atmosphere protection device, which comprises an acrylic box body 2.1, a flow control box 4.1 and a PLC (programmable logic controller) control box 4.2, wherein a water cooling device 3.2, a substrate 3.3, a laser cladding instrument and an oxygen concentration detector 2.7 are arranged in the acrylic box body 2.1, the water cooling device 3.2 is used for cooling the substrate 3.3 placed on the surface of the water cooling device, an annular pipeline 2.2 used for inputting argon is arranged along the inner wall of the acrylic box body 2.1, and a plurality of air holes are uniformly distributed on the surface of the annular pipeline 2.2; the oxygen concentration detector 2.7 is fixed on the inner wall of the acrylic box body 2.1 and is connected with the PLC control box 4.2 through a signal wire; the ring pipeline 2.2 is connected with a flow control box 4.1, and the PLC control box 4.2 receives oxygen concentration content data from an oxygen concentration detector 2.7 and adjusts the argon flow input from the flow control box 4.1 to the ring pipeline 2.2.
The device is improved based on the existing triaxial laser cladding platform, and the problems of high equipment cost, high use cost and the like caused by the establishment of a large-scale environment protection cabin are avoided. The problem of atmosphere protection of titanium alloy additive manufacturing in colleges and universities laboratories is solved, and the research on the relation between the process, the organization and the performance of the titanium alloy additive manufacturing technology can be realized at low cost and high efficiency by scientific research personnel.
Example 2
The invention provides a small titanium alloy additive manufacturing atmosphere protection device, which is based on embodiment 1, and further comprises, as shown in fig. 1-5, an acrylic box body 2.1 is placed on a working platform 1.1, a moving device is arranged on the working platform 1.1, the moving device comprises an x-axis driving mechanism 1.6, a y-axis driving mechanism 1.2 and a z-axis driving mechanism 1.3, the x-axis driving mechanism 1.6 is connected to the working platform 1.1 in a sliding manner and stretches across the acrylic box body 2.1, the y-axis driving mechanism 1.2 is connected to the x-axis driving mechanism 1.6 in a sliding manner, and the z-axis driving mechanism 1.3 is connected to the y-axis driving mechanism 1.2 in a sliding manner. The x-axis driving mechanism 1.6, the z-axis driving mechanism 1.3 and the y-axis driving mechanism 1.2 adopt a conventional screw rod or a pneumatic sliding table to realize the adjustment of the spatial position of the laser head 1.4.
Further, the laser cladding instrument is connected on z axle actuating mechanism 1.3 through the fixed plate, and the laser cladding instrument is including having accessed laser head 1.4 of laser transmission optic fibre 1.5, install below laser head 1.4 and clad the head.
Further, there is the circulation runner in water cooling plant 3.2's inside be used for right base plate 3.3 cools off, be equipped with circulating pipe 3.4 on the water cooling plant 3.2, circulating pipe 3.4 is through the aperture and the external connection of seting up on the ya keli box 2.1.
Further, ya keli box 2.1 top is equipped with safety cover 2.4, safety cover 2.4 bonds at ya keli box 2.1 top through glue, and the center department of safety cover 2.4 is provided with the hole that the outer wall that holds laser head 1.4 passed, and the hole of safety cover 2.4 passes through rubber seal to be fixed in laser head 1.4's outer wall department, makes yakeli box 2.1's upper portion seal.
Further, detachable transparent observation board 2.5 that is connected with one on the lateral wall of ya keli box 2.1, seted up one on the lateral wall of ya keli box 2.1 and held just transparent observation board 2.5's mounting groove, transparent observation board 2.5 is installed seal yakeli box 2.1 in the mounting groove, through transparent observation board can conveniently print the process and observe.
Further, the bottom of the acrylic box body 2.1 is provided with a bottom plate 3.1, the bottom plate 3.1 is positioned below the water cooling device 3.2, and the bottom plate 3.1 is provided with uniform heat dissipation holes.
Further, the annular pipeline 2.2 is clamped on the inner wall of the acrylic plate through a pipeline fixer 2.6.
Example 3
On the basis of embodiment 2, the invention provides a using method of a small titanium alloy additive manufacturing atmosphere protection device, which comprises the following steps:
step one, placing an acrylic box body 2.1 on the surface of a working platform 1.1, placing a bottom plate 3.1 at the bottom of the acrylic box body 2.1, placing a water cooling device 3.2 at a proper position on the bottom plate 3.1, introducing a water inlet pipe and a water return pipe of the water cooling device 3.2 into the outside through a small hole in the acrylic box body 2.1, and placing a base plate 3.3 on a water cooling base. The oxygen concentration detector 2.7 is fixed on the inner wall of the acrylic box body 2.1, and a signal wire is led into the outside through a hole in the acrylic box body 2.1 and is connected with the PLC control box 4.2.
And step two, the laser head 1.4 is adjusted to a proper position through a moving device of the working platform 1.1, an x-axis driving mechanism 1.6 on the working platform 1.1 controls the laser head 1.4 to move back and forth, a y-axis driving mechanism 1.2 controls the laser head 1.4 to move left and right, and a z-axis driving mechanism controls the laser head 1.4 to move up and down. Then, the peripheral edge part of the top protective cover 2.4 is bonded with the inner wall of the top end of the acrylic box body 2.1 through glue, the top protective cover is placed for a period of time and is completely solidified, a hole in the center of the top protective cover 2.4 penetrates through the laser head 1.4 and is adjusted to the position matched with the middle part of the laser head 1.4, and a rubber ring is used for pressing, so that the upper part area of the acrylic box body 2.1 is sealed.
And step three, opening a valve of the flow control box 4.1, continuously filling argon into the acrylic box body 2.1, and when the oxygen concentration content is reduced to be below 100ppm, sending an instruction to the flow control box 4.1 by a program in the PLC control box 4.2 at the moment, reducing the flow of the argon gas inflow, and opening a circulating system of the water cooling device 3.2 only by a small flow because the oxygen concentration content of the environment is maintained to be below 100ppm, wherein the surface of the water cooling device 3.2 and a heat dissipation structure inside the water cooling device are both made of pure copper materials with good heat conductivity, and a laser cladding system integrated with the working platform 1.1 is used for titanium alloy material increase manufacturing.
In the invention, the laser power of the laser cladding system is 1000W-5000W, the diameter of a light spot is 2 mm-4 mm, and the diameter of an optical fiber core is 600 um.
In the present invention, the material for additive manufacturing may be other alloys that are susceptible to chemical reaction with oxygen at high temperatures.
In the invention, under the conditions that the volume of the part manufactured by the additive is small and the integral heat input is not high, the water cooling device 3.2 can be removed, the base plate 3.3 is directly placed above the bottom plate 3.1, and the small opening hole for the inlet and outlet of the circulating water pipe 3.4 on the acrylic box body 2.1 is sealed by sealant.
While the present invention has been described in detail with reference to the illustrated embodiments, it should not be construed as limited to the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. The atmosphere protection device for the small titanium alloy additive manufacturing is characterized by comprising an acrylic box body (2.1), a flow control box (4.1) and a PLC (programmable logic controller) control box (4.2), wherein a water cooling device (3.2), a substrate (3.3), a laser cladding instrument and an oxygen concentration detector (2.7) are arranged inside the acrylic box body (2.1), the water cooling device (3.2) is used for cooling the substrate (3.3) placed on the surface of the substrate, an annular pipeline (2.2) used for inputting argon is arranged along the inner wall of the acrylic box body (2.1), and a plurality of air holes are uniformly distributed on the surface of the annular pipeline (2.2); the oxygen concentration detector (2.7) is fixed on the inner wall of the acrylic box body (2.1) and is connected with the PLC control box (4.2) through a signal wire; the ring pipeline (2.2) is connected with the flow control box (4.1), the PLC control box (4.2) receives oxygen concentration content data from the oxygen concentration detector (2.7), and argon flow input from the flow control box (4.1) to the ring pipeline (2.2) is adjusted.
2. The small titanium alloy additive manufacturing atmosphere protection device according to claim 1, wherein the acrylic box (2.1) is placed on the working platform (1.1), the working platform (1.1) is provided with a moving device, the moving device comprises an x-axis driving mechanism (1.6), a y-axis driving mechanism (1.2) and a z-axis driving mechanism (1.3), the x-axis driving mechanism (1.6) is slidably connected to the working platform (1.1) and stretches over the acrylic box (2.1), the y-axis driving mechanism (1.2) is slidably connected to the x-axis driving mechanism (1.6), and the z-axis driving mechanism (1.3) is slidably connected to the y-axis driving mechanism (1.2).
3. The atmosphere protection device for small titanium alloy additive manufacturing according to claim 2, wherein the laser cladding instrument is connected to the z-axis driving mechanism (1.3) through a fixing plate, the laser cladding instrument comprises a laser head (1.4) connected with a laser transmission fiber (1.5), and a cladding head is installed below the laser head (1.4).
4. The atmosphere protection device for the small titanium alloy additive manufacturing according to claim 1, wherein a circulation flow channel is arranged inside the water cooling device (3.2) and used for cooling the substrate (3.3), a circulation water pipe (3.4) is arranged on the water cooling device (3.2), and the circulation water pipe (3.4) is connected with the outside through a small hole formed in the acrylic box body (2.1).
5. The small titanium alloy additive manufacturing atmosphere protection device according to claim 3, wherein a protection cover (2.4) is arranged on the top of the acrylic box body (2.1), the protection cover (2.4) is adhered to the top of the acrylic box body (2.1) through glue, a hole for accommodating the outer wall of the laser head (1.4) to pass through is formed in the center of the protection cover (2.4), and the hole of the protection cover (2.4) is fixed to the outer wall of the laser head (1.4) through a rubber sealing ring, so that the upper portion of the acrylic box body (2.1) is sealed.
6. The atmosphere protection device for small titanium alloy additive manufacturing according to claim 5, wherein a transparent observation plate (2.5) is detachably connected to the side wall of the acrylic box (2.1), a mounting groove is formed in the side wall of the acrylic box (2.1) and is used for accommodating the transparent observation plate (2.5), and the transparent observation plate (2.5) is mounted in the mounting groove to seal the acrylic box (2.1).
7. The atmosphere protection device for small titanium alloy additive manufacturing according to claim 1, wherein a bottom plate (3.1) is arranged at the bottom of the acrylic box body (2.1), the bottom plate (3.1) is located below the water cooling device (3.2), and heat dissipation holes are uniformly formed in the bottom plate (3.1).
8. The small titanium alloy additive manufacturing atmosphere protection device according to claim 1, wherein the annular pipe (2.2) is clamped on the inner wall of the acrylic plate through a pipe fixer (2.6).
9. Use of a compact titanium alloy additive manufacturing atmosphere protection device according to any one of claims 1 to 8, comprising the steps of:
s1, placing an open acrylic box body (2.1) on a table top of a working platform (1.1), placing a bottom plate (3.1) at the bottom of the acrylic box body (2.1), placing a water cooling device (3.2) at a proper position on the bottom plate (3.1), introducing a circulating water pipe (3.4) of the water cooling device (3.2) to the outside through a hole formed in the acrylic box body (2.1), and placing a substrate (3.3) above a base of the water cooling device (3.2);
s2, fixing an oxygen concentration detector (2.7) on the inner wall of the acrylic box body (2.1), and introducing a signal wire to the outside to be connected with a PLC control box (4.2);
step S3, adjusting the laser head (1.4) to a proper position through a moving device on the working platform (1.1), connecting the periphery of the protective cover (2.4) with the inner wall of the top end of the acrylic box body (2.1) through gluing, penetrating a hole in the center of the protective cover (2.4) through the laser head (1.4), and sealing by using a rubber sealing ring;
step S4, connecting the annular pipeline (2.2) with a flow control box (4.1) through a pipeline, and sealing the hole gap part on the acrylic box body (2.1) by using an air-proof sealant;
and S5, opening a valve of the flow control box (4.1), filling argon into the acrylic box body (2.1) through the annular pipeline (2.2), opening a circulating system of the water cooling device (3.2) after the oxygen concentration content is reduced to a proper concentration, and performing titanium alloy additive manufacturing by using the integrated laser cladding system.
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