CN113601732B - Processing method of ceramic material wind tunnel model - Google Patents
Processing method of ceramic material wind tunnel model Download PDFInfo
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- CN113601732B CN113601732B CN202110715184.XA CN202110715184A CN113601732B CN 113601732 B CN113601732 B CN 113601732B CN 202110715184 A CN202110715184 A CN 202110715184A CN 113601732 B CN113601732 B CN 113601732B
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- 229910010293 ceramic material Inorganic materials 0.000 title claims abstract description 20
- 238000003672 processing method Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 67
- 230000008569 process Effects 0.000 claims abstract description 45
- 238000003754 machining Methods 0.000 claims abstract description 42
- 239000000919 ceramic Substances 0.000 claims abstract description 22
- 238000007514 turning Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims description 40
- 239000010432 diamond Substances 0.000 claims description 20
- 229910003460 diamond Inorganic materials 0.000 claims description 20
- 239000000956 alloy Substances 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000000748 compression moulding Methods 0.000 claims description 3
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract description 42
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000003801 milling Methods 0.000 abstract description 4
- 238000011160 research Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000405070 Percophidae Species 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/16—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by turning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
- B28D7/04—Accessories specially adapted for use with machines or devices of the preceding groups for supporting or holding work or conveying or discharging work
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Milling Processes (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
The invention relates to the technical field of aerospace, and provides a processing method of a ceramic material wind tunnel model, which comprises the following steps: 1) Preparing a green body material; 2) Turning an inner cavity eccentric hole and a cylindrical step shaft; 3) Sintering the green body material; 4) Finish turning the excircle reference and the inner cavity eccentric hole to final dimensions to obtain a blank; 5) Fixing the blank piece on a machine tool by utilizing a V-shaped clamping block, and performing rough machining, semi-finish machining and finish machining; 6) Fixing the blank on a machine tool by utilizing a process head removing clamping block, and sequentially removing a head process head and a tail process head; 7) And shaping, grinding and polishing the workpiece to obtain a finished product. The invention solves the high-efficiency precision processing technology of the hard and brittle material, establishes the working procedures and parameters of the high-efficiency milling and grinding technology of the special-shaped curved surface of the ceramic part, obviously inhibits the common vibration and edge breakage phenomena of the processed ceramic material, obviously improves the surface quality of the part and realizes the high-efficiency manufacture of the large-size special-shaped complex curved surface zirconia ceramic part.
Description
Technical Field
The invention relates to the technical field of aerospace, in particular to a processing method of a ceramic material wind tunnel model.
Background
With the development of high-altitude high-speed aircrafts, developing corresponding wind tunnel test researches are more and more, the requirements are higher and higher, and it is urgent to manufacture a wind tunnel test model capable of meeting a series of scientific researches such as wind tunnel test precision research, wind tunnel standard database establishment, wind tunnel performance assessment, wind tunnel performance calibration and the like.
The Y-TZP material is a tetragonal zirconia polycrystalline ceramic material taking Y203 as a stabilizer, the composition of the Y203 is between 1.5 and 3.0 percent (mole fraction), a small amount of nano-grade Al2O3 micro powder is doped in the zirconia powder stabilized by the Y203 so as to promote the sintering densification of ZrO2 blank, increase the mechanical property, generally sinter in tetragonal or tetragonal and cubic 2-phase regions within the temperature range of 1400-1600 ℃, and a small amount of glass phase exists at the grain boundary. The Y-TZP ceramic can be subjected to stress-induced phase change toughening mechanism, so that the material has excellent mechanical property and linear expansion coefficient which are close to those of steel.
The Mohs hardness of the zirconia ceramic is 8.5, and the zirconia ceramic is similar to that of sapphire, and is wear-resistant and scratch-resistant; the zirconia ceramic has low thermal conductivity and is as good as jade in touch, is a non-conductive material, can not shield signals, can not influence antenna layout, and can be conveniently formed integrally; the dielectric constant of the zirconia ceramic is 3 times that of the sapphire, and the zirconia ceramic has better high-temperature mechanical property, chemical erosion resistance, electrical insulation, higher hardness, wear resistance and the like.
As shown in figure 1, the large Y-TZP zirconia finished part 1 has long and deep three-stage inner cavity eccentric holes and duckbill special-shaped outer surfaces, the whole length is 400mm, the maximum elliptical outer diameter is 130mm, the side length of the maximum inner square hole is 75mm, the diameter of the maximum inner circular hole is 40mm, and the part has the characteristics of high toughness, high strength and high compactness, and is difficult to ensure the manufacturing accuracy in the processing process. Therefore, how to solve the above problems has been the focus of research by those skilled in the art.
Disclosure of Invention
The invention aims to provide a processing method of a ceramic material wind tunnel model, which aims to solve the problem of the prior art.
The embodiment of the invention is realized by the following technical scheme:
a processing method of a ceramic material wind tunnel model comprises the following steps:
1) Preparing a green body material;
2) Turning an outline cylinder and an inner cavity eccentric hole on a green blank material, turning a plurality of step shafts on the outline cylinder, and turning a centering center hole at the top end of each step shaft;
3) Sintering the green body;
4) Adopting a diamond insert coating lathe tool, and taking aa=0.25-0.5 mm and F=0.03-0.1 mm/S and V=25m/min as turning parameters to finish turning an excircle reference and an inner cavity eccentric hole to a final size to obtain a blank;
5) Fixing a blank on a machine tool by using a V-shaped clamping block matched with a pressing plate, performing rough machining by using a hydraulic cutter handle and an indexable 250# diamond particle coating cutter head of a hard alloy cutter bar, wherein a cutter path adopts an oscillating cutting mode, cutting parameters are aa=0.2mm, ar=0.2mm, F=0.05 mm/S, V=150 m/min, and machining allowance is 0.3-0.6 mm;
6) Semi-finishing is carried out on the indexable 400# diamond particle coated tool bit by adopting a hydraulic tool handle and a hard alloy tool bar, the tool path adopts a mode of equal-height cutting, the cutting parameters are aa=0.1 mm, F=1500 mm/min, S=9000r/min, and the machining allowance is 0.2mm;
7) The indexable 800# diamond particle coated tool bit of the hydraulic tool handle and the hard alloy tool bar is adopted for finish machining, the tool path adopts a mode of equal-height cutting, the cutting parameters are aa=0.02-0.05 mm, F=1500 mm/min, and S=20000 r/min;
8) Removing the V-shaped clamping blocks and the pressing plates, fixing the workpiece subjected to finish machining in the step 5) on a machine tool by using the process head removing clamping blocks, and removing the head process head of the workpiece and the tail process head of the workpiece according to the step 7);
9) And unloading the workpiece, shaping, grinding and polishing to obtain the final part.
Further, in step 1), the preparation method of the green body material is: and according to the designed shape of the enveloping green body, adopting a dry-mixing compression molding process to compress the cylindrical green body, wherein the middle hole is formed by compressing a steel core.
Further, in step 3), the sintering temperature is 1400-1600 ℃.
Further, in step 5), the V-shaped clamping block comprises a head V-shaped clamping block and a tail V-shaped clamping block, the head V-shaped clamping block and the tail V-shaped clamping block comprise supporting blocks, a V-shaped groove which is attached to the outer contour surface of the workpiece is formed in the supporting blocks, and a cushion block is further arranged at the bottom of the supporting blocks of the head V-shaped clamping block so as to keep the same height with the tail V-shaped clamping block.
Further, in step 8), the removing head clamping block comprises an upper clamping block and a lower clamping block, arc-shaped grooves attached to the outer contours of the workpieces are formed in opposite faces of the upper clamping block and the lower clamping block, and the upper clamping block and the lower clamping block are fixed into a whole through screws.
Further, in step 8), the upper clamping block and the lower clamping block are temporarily fixed with the workpiece at the arc-shaped groove through an adhesive.
Further, in step 8), before removing the process head, three-coordinate measurement is performed on the workpiece with the process head clamping block removed on a machine tool, the process head clamping block removed is adjusted, and assembly errors between the process head clamping block removed and the ceramic part are reduced.
Further, in step 8), after the head process head is removed, rough machining, semi-finishing and finishing are required to be performed on the workpiece head.
Further, in step 8), the method for removing the tail process head is as follows: the diamond cutting blade is selected to integrally cut and remove large allowance, then finish machining is carried out, a hydraulic cutter handle, a hard alloy cutter bar and an indexable 800# diamond particle coating cutter head are adopted during finish machining, a mode of equal-height cutting is adopted for a cutter path, aa=0.02-0.05 mm, F=1500 mm/min and S=20000 revolutions/min are selected as cutting parameters.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
1. according to the structural characteristics of the product, the invention develops the researches on preparation of ceramic blanks, planning of cutting processing technology, design of cutting tools, cutting efficiency and quality aiming at special-shaped curved surfaces with complex inner cavities and outer cavities, and successfully prepares large Y-TZP zirconia finished parts, wherein the quality and dimensional accuracy of the machined surfaces of the parts meet the design and assembly requirements.
2. The invention solves the high-efficiency precision processing technology of the hard and brittle material, establishes the working procedures and parameters of the high-efficiency milling and grinding technology of the special-shaped curved surface of the ceramic part, obviously inhibits the common vibration and edge breakage phenomena of the processed ceramic material, obviously improves the surface quality of the part and realizes the high-efficiency manufacture of the large-size special-shaped complex curved surface zirconia ceramic part.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a large Y-TZP zirconia finished part provided by the invention;
FIG. 2 is a cross-sectional view of a large Y-TZP zirconia finished part provided by the invention;
FIG. 3 is a diagram showing the shape change of a large Y-TZP zirconia finished part in the machining process;
FIG. 4 is a second diagram of the shape change of the finished large Y-TZP zirconia part in the machining process;
FIG. 5 is a third diagram of the shape change of a large Y-TZP zirconia finished part provided by the invention in the processing process;
FIG. 6 is a diagram showing the shape change of a large Y-TZP zirconia finished part in the machining process;
FIG. 7 is a diagram showing the shape change of a large Y-TZP zirconia finished part in the machining process
FIG. 8 is a schematic view of the structure of a head V-clamp block;
FIG. 9 is a schematic view of the structure of the trailing V-clamp block;
fig. 10 is a schematic view of the structure of the chuck for removing the process head.
Icon: 1-finished parts, 2-blanks, 3-tail V-shaped clamping blocks, 4-head V-shaped clamping blocks, 5-cushion blocks, 6-pressing plates, 7-process head clamping blocks, 701-upper clamping blocks and 702-lower clamping blocks.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1 to 3, the embodiment provides a method for processing a ceramic material wind tunnel model, which includes the following steps:
step one: preparing a green body material; specifically, according to the theoretical shape of the wind tunnel model of the ceramic material, designing the shape of the enveloping green body, and according to the shape of the enveloping green body, adopting a dry-mixing compression molding process to compress a cylindrical green body, wherein the middle hole is formed by compressing a steel core;
step two: turning an inner cavity eccentric hole on a green body material by adopting a lathe, turning an outer contour into an outer contour cylinder, turning the outer contour cylinder into step shafts with different diameters, and turning a centering center hole in the center of the top end of a workpiece;
step three: sintering and forming a green body at 1400-1600 ℃;
step four: adopting a diamond insert coating lathe tool, and taking aa=0.25-0.5 mm and F=0.03-0.1 mm/S and V=25m/min as cutting parameters to finish turning an excircle reference and an inner cavity eccentric hole to a final size to obtain a blank 2;
step five, designing two V-shaped clamping blocks, and fixing the blank 2 on a machine tool to enable the axle center of the sintered green compact after clamping to be parallel to a processing working platform; the V-shaped clamping blocks comprise a head V-shaped clamping block 4 and a tail V-shaped clamping block 3, the head V-shaped clamping block 4 and the tail V-shaped clamping block 3 comprise supporting blocks, a V-shaped groove which is attached to the outer contour surface of a workpiece is formed in each supporting block, and a cushion block 5 is further arranged at the bottom of each supporting block of the head V-shaped clamping block 4 so as to keep the same height with the tail V-shaped clamping block 3;
step six: the cylindrical blank is placed into two V-shaped blocks, the axis is aligned, the reference of a process platform is aligned, the left and right sides are pressed by pressing plates 6 to compress a workpiece, and a high-precision, high-rotation-speed and high-rigidity numerical control machine tool is selected for rough machining of the first surface of the model part. During milling, a hydraulic cutter handle, a hard alloy cutter bar and an indexable 250# diamond particle coating cutter head are adopted, a cutter path adopts an oscillating cutting mode, and cutting parameters are aa=0.2mm, ar=0.2mm, F=0.05 mm/S and V=150 m/min. During rough machining, uniformly reserving 0.3-0.6 mm semi-finishing allowance on the molded surface of the part;
step seven: disassembling a machined workpiece, turning over, clamping and aligning the workpiece again, and adopting the same technological method and technological parameters as those of the step six to carry out rough machining on the second surface of the part, wherein during rough machining, 0.3-0.6 mm of semi-finishing allowance is uniformly reserved on the molded surface of the part;
step eight: and in the seventh step, semi-finishing is carried out on the second surface of the part, during semi-finishing, a hydraulic cutter handle, a hard alloy cutter bar and an indexable 400# diamond particle coated cutter head are adopted, a mode of equal-height cutting is adopted for a cutter path, aa=0.1 mm, F=1500 mm/min and S=9000r/min are selected as cutting parameters. During semi-finishing, uniformly reserving 0.2mm finishing allowance on the molded surface of the part;
step nine: disassembling a machined workpiece, turning over, clamping and aligning the workpiece again, wherein the clamping state is the same as that of the step eight, semi-finishing the first surface of the workpiece, during semi-finishing, adopting a hydraulic cutter handle, a hard alloy cutter bar and an indexable 400# diamond particle coated cutter head, adopting a mode of equal-height cutting for a cutter path, and selecting aa=0.1 mm, F=1500 mm/min and S=9000r/min as cutting parameters. During semi-finishing, uniformly reserving 0.2mm finishing allowance on the molded surface of the part;
step ten: and (3) the clamping state is the same as that of the step nine, the first surface of the part is subjected to finish machining, during finish machining, a hydraulic cutter handle, a hard alloy cutter bar and an indexable 800# diamond particle coated cutter head are adopted, a cutter path adopts a mode of equal-height cutting, the cutting parameters are aa=0.02-0.05 mm, F=1500 mm/min and S=20000 revolutions/min. During finish machining, the molded surface does not leave a margin, and the finished product is machined in place.
Step eleven: the machining method comprises the steps of disassembling a machined workpiece, turning over, clamping and aligning the workpiece again, wherein the clamping state is the same as that of the step ten, finish machining is carried out on the first surface of the workpiece, during finish machining, a hydraulic cutter handle, a hard alloy cutter bar and an indexable 800# diamond particle coating cutter head are adopted, a cutter path adopts a mode of equal-height cutting, and cutting parameters are aa=0.02-0.05 mm, F=1500 mm/min and S=20000 r/min. During finish machining, the molded surface does not leave a margin, and the finished product is machined in place.
Designing two types of process head removing clamping blocks 7, wherein the process head removing clamping blocks 7 comprise an upper clamping block 701 and a lower clamping block 702, arc-shaped grooves which are attached to the outer contours of workpieces are formed in the opposite surfaces of the upper clamping block 701 and the lower clamping block 702, the special-shaped surfaces of the process head removing clamping blocks 7 are finished in place according to the outer surfaces of a ceramic wind tunnel model main body, the attaching surfaces between the upper clamping block 701 and the lower clamping block 702 are tightly attached, the upper clamping block 701 and the lower clamping block 702 are temporarily fixed firmly with ceramic parts by using an adhesive, and the upper clamping block 701 and the lower clamping block 702 are tightly connected by using pins and screws.
And thirteen, carrying out three-coordinate measurement on the workpiece with the process head clamping block 7, ensuring the accuracy of the relative positions of the workpiece and the process head clamping block 7, and repairing and adjusting the process head clamping block 7 again if assembly errors occur at the moment so that the relative positions of the workpiece and the ceramic parts are accurate and reliable.
And fourteen, firstly removing a head process head, converting a process standard onto a process head removing clamping block 7, clamping, aligning and tool setting a workpiece by utilizing the process head removing clamping block 7, and carrying out rough machining, semi-finishing and finishing on the head of the workpiece, wherein the process methods adopted by the rough machining, the semi-finishing and the finishing are the same as the methods for machining the first molded surface and the second molded surface.
And fifteen, removing the tail process head, and synchronizing fourteen modes of clamping, aligning and tool setting. Because the tail process head material is large, the diamond cutting blade is selected to integrally cut and remove the large allowance, then finish machining is carried out, a hydraulic cutter handle, a hard alloy cutter bar and an indexable 800# diamond particle coating cutter head are adopted during finish machining, the cutter path adopts a mode of equal-height cutting, and the cutting parameters are aa=0.02-0.05 mm, F=1500 mm/min and S=20000 r/min. During finish machining, the molded surface does not leave a margin, and the finished product is machined in place.
Seventeenth, removing the process head clamping blocks 7 adhered at the two positions in the middle of the workpiece, and shaping, grinding and polishing the ceramic part to obtain the final quality requirement.
From the above, the processing method of the ceramic material wind tunnel model provided by the invention has the beneficial effects that:
1. according to the structural characteristics of the product, the invention develops the researches on preparation of ceramic blanks, planning of cutting processing technology, design of cutting tools, cutting efficiency and quality aiming at special-shaped curved surfaces with complex inner cavities and outer cavities, and successfully prepares large Y-TZP zirconia finished parts, wherein the quality and dimensional accuracy of the machined surfaces of the parts meet the design and assembly requirements.
2. The invention solves the near-net forming process technology of ceramic parts, prepares zirconia ceramic blanks with high toughness, high strength and high density, solves the difficult problem of manufacturing the whole blanks of the parts, overcomes the difficult problem of difficult guarantee of precision caused by the disassembly and the preparation of the blanks and the reassembly, and lays a foundation for high-precision assembly of subsequent finished parts.
3. The invention solves the high-efficiency precision processing technology of the hard and brittle material, establishes the working procedures and parameters of the high-efficiency milling and grinding technology of the special-shaped curved surface of the ceramic part, obviously inhibits the common vibration and edge breakage phenomena of the processed ceramic material, obviously improves the surface quality of the part and realizes the high-efficiency manufacture of the large-size special-shaped complex curved surface zirconia ceramic part.
4. The invention covers the knowledge of ceramic material preparation, hard and brittle material cutting processing, cutter design, process planning and other materials and mechanical interdisciplines. By the method, the high-temperature insulation wind tunnel test model with high wear resistance, scratch resistance, good chemical stability, small specific heat and heat conductivity and high temperature insulation can be processed; the wind tunnel test model can meet a series of scientific researches such as wind tunnel test accuracy research, wind tunnel standard database establishment, wind tunnel performance assessment, wind tunnel performance calibration and the like.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The processing method of the ceramic material wind tunnel model is characterized by comprising the following steps of:
1) Preparing a green body material, adopting a dry mixing compression molding process according to the designed shape of the enveloping green body, and compressing a cylindrical green body, wherein a middle hole is formed by compressing a steel core;
2) Turning an outline cylinder and an inner cavity eccentric hole on a green blank material, turning a plurality of step shafts on the outline cylinder, and turning a centering center hole at the top end of each step shaft;
3) Sintering the green body;
4) Adopting a diamond insert coating lathe tool, and taking aa=0.25-0.5 mm and F=0.03-0.1 mm/S and V=25m/min as turning parameters to finish turning an excircle reference and an inner cavity eccentric hole to a final size to obtain a blank;
5) The method comprises the steps that a V-shaped clamping block is used for being matched with a pressing plate to fix a blank on a machine tool, a hydraulic cutter handle and an indexable 250# diamond particle coating cutter head of a hard alloy cutter bar are adopted for rough machining, a cutting path adopts an oscillating cutting mode, cutting parameters are aa=0.2 mm, ar=0.2 mm, F=0.05 mm/S, V=150 m/min, machining allowance is 0.3 mm-0.6 mm, the V-shaped clamping block comprises a head V-shaped clamping block and a tail V-shaped clamping block, the head V-shaped clamping block and the tail V-shaped clamping block both comprise supporting blocks, a V-shaped groove which is attached to the outer contour surface of a workpiece is formed in the supporting blocks, and a cushion block is further arranged at the bottom of the supporting blocks of the head V-shaped clamping block so as to keep the same height with the tail V-shaped clamping block;
6) Semi-finishing is carried out on the indexable 400# diamond particle coated tool bit by adopting a hydraulic tool handle and a hard alloy tool bar, the tool path adopts a mode of equal-height cutting, the cutting parameters are aa=0.1 mm, F=1500 mm/min, S=9000r/min, and the machining allowance is 0.2mm;
7) The indexable 800# diamond particle coated tool bit of the hydraulic tool handle and the hard alloy tool bar is adopted for finish machining, the tool path adopts a mode of equal-height cutting, the cutting parameters are aa=0.02-0.05 mm, F=1500 mm/min, and S=20000 r/min;
8) Removing the V-shaped clamping blocks and the pressing plates, fixing the workpiece subjected to finish machining in the step 7) on a machine tool by using the process head removing clamping blocks, and removing the head process head of the workpiece according to the step 7), and then removing the tail process head, wherein after the head process head is removed, rough machining, semi-finish machining and finish machining are required to be carried out on the head of the workpiece;
9) And unloading the workpiece, shaping, grinding and polishing to obtain the final part.
2. The method for processing the wind tunnel model made of the ceramic material according to claim 1, wherein the method comprises the following steps of: in the step 3), the sintering temperature is 1400-1600 ℃.
3. The method for processing the wind tunnel model made of the ceramic material according to claim 1, wherein the method comprises the following steps of: in the step 8), the process head removing clamping block comprises an upper clamping block and a lower clamping block, arc-shaped grooves attached to the outer contours of the workpieces are formed in the opposite surfaces of the upper clamping block and the lower clamping block, and the upper clamping block and the lower clamping block are fixed into a whole through screws.
4. A method of processing a wind tunnel model of ceramic material according to claim 3, wherein: in the step 8), the upper clamping block and the lower clamping block are temporarily fixed with the workpiece at the arc-shaped groove through an adhesive.
5. The method for processing the wind tunnel model made of the ceramic material according to claim 1, wherein the method comprises the following steps of: in the step 8), before the process head is removed, three-coordinate measurement is required to be carried out on the workpiece with the process head clamping blocks removed on a machine tool, the process head clamping blocks removed are adjusted, and the assembly error between the process head clamping blocks removed and the ceramic part is reduced.
6. The method for processing the wind tunnel model made of the ceramic material according to claim 1, wherein the method comprises the following steps of: in step 8), the method for removing the tail process head is as follows: the diamond cutting blade is selected to integrally cut and remove large allowance, then finish machining is carried out, a hydraulic cutter handle, a hard alloy cutter bar and an indexable 800# diamond particle coating cutter head are adopted during finish machining, a mode of equal-height cutting is adopted for a cutter path, aa=0.02-0.05 mm, F=1500 mm/min and S=20000 r/min are selected as cutting parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110715184.XA CN113601732B (en) | 2021-06-26 | 2021-06-26 | Processing method of ceramic material wind tunnel model |
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| CN114290263B (en) * | 2021-12-29 | 2024-05-14 | 广东东唯新材料有限公司 | Manufacturing method of curved surface support base of ceramic plate and curved surface support base |
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| CN117260399B (en) * | 2023-09-26 | 2025-11-18 | 航天材料及工艺研究所 | A low-damage machining process for dense silicon nitride ceramic cones |
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