Spraying pipe dissecting method

Abstract

The spray pipe dissection method comprises the steps that a metal connecting piece protruding out of the outer side of a spray pipe shell is removed; the spray pipe body dissection sample comprises a fixed body dissection sample, a spherical section dissection sample and a diffusion section dissection sample. Dissecting the fixed body sample, and decomposing along the axis direction to obtain a tensile sample and a compression sample; dissecting the spherical section sample, and decomposing along the axis direction to obtain a tensile sample; dissecting the diffusion section sample, sampling, cutting the diffusion section into a plurality of sections of annular structures (A, B, C, D, I and II) along the axial direction, and manufacturing small-size interface shear samples in the area A and the area B; a large-size interface shearing sample and a pulling-away sample are manufactured in the C area; an ablation sample, a heat conductivity coefficient sample and a linear expansion coefficient sample are manufactured in the D area; the ring I and the ring II are used for manufacturing an annular bonding interface sample. The device is reasonably arranged and is matched with the processing technology, the nozzle body is comprehensively tested, the performance of the nozzle body is comprehensively detected, and materials are fully applied.

Description

Technical Field

[0001] The invention relates to the technical field of solid rocket engine testing, and in particular to a nozzle dissection method. Background Art

[0002] The nozzle is a basic component of a solid rocket engine. When conducting a comprehensive test on the nozzle body, the three main components of the nozzle need to be cut and decomposed to obtain test specimens that meet various test indicators, including tensile specimens, compression specimens, ablation specimens, interlaminar shear specimens, interface shear specimens, linear expansion coefficient specimens, etc.

[0003] Most of the existing technologies focus on the equipment development technology and cutting methods that can realize the cutting of nozzle samples, focusing on solving the problems that it is difficult to obtain a suitable cutting angle due to the large taper of the nozzle, and the cutting machine tool has a complex structure and is not flexible to use. As described in the patent document with application number CN201720838246.5, a nozzle cutting device with a high degree of automation can cut at different positions of the nozzle and can flexibly cut nozzle cutting devices with any angle of bevel. Its working principle is that by changing the extension length of the horizontal cylinder piston rod, the angle formed between the saw blade and the nozzle can be changed; by changing the extension or retraction of the vertical cylinder piston rod, the height of the saw blade can be adjusted, thereby achieving cutting at different positions of the nozzle. The present invention is applicable to a solid rocket engine nozzle body whose fixed body has an outer layer made of steel and an inner layer made of high-silicon / phenolic molded material and carbon fiber / phenolic molded material; whose spherical segment has an inner layer made of high-silicon / phenolic molded material and carbon fiber / phenolic molded material; and a nozzle test piece to be dissected whose diffusion segment has an outer layer made of steel and an inner layer made of high-silicon cloth / phenolic winding composite material and carbon cloth / phenolic winding composite material.

[0004] There is no reasonable method for extracting samples from the nozzle body of a solid rocket engine in the prior art, and there is no effective way to use the nozzle body as an extraction sample, and the focus is on introducing the operational flexibility of the cutting equipment and the relationship between the mechanical assembly of the equipment. Summary of the invention

[0005] The present invention provides a nozzle dissection method to solve the problem that the prior art cannot effectively utilize the method for extracting samples from the nozzle body of a solid rocket engine.

[0006] In order to solve the above-mentioned technical problems, one of the objects of the present invention is to provide a nozzle dissection method, which comprises the following steps:

[0007] S1: Use a machine tool to remove the protruding metal connector on the outside of the nozzle shell;

[0008] S2: Determine the sampling of the test piece of the nozzle anatomical specimen, wherein the nozzle body anatomical specimen is composed of a fixed body anatomical specimen, a spherical section anatomical specimen and a diffuser section anatomical specimen;

[0009] S3: Dissect the fixed body specimen. This section is a molded test piece, which is obtained by dissecting along the axial direction and is used to make tensile specimens and compression specimens.

[0010] S4: Spherical segment specimen dissection, this segment is a molded test piece, obtained by disassembly along the axis direction. Used to make tensile specimens;

[0011] S5: Dissect the diffusion section sample. This section is a winding test piece, which is obtained by decomposing along the axial direction. The sampling is mainly to cut the diffusion section into several annular structures (A, B, C, D, I, II) along the axial direction. Among them, areas A and B are used to make small-sized interface shear specimens; area C is used to make large-sized interface shear specimens and tear-off specimens; area D is used to make ablation specimens, thermal conductivity specimens and linear expansion coefficient specimens; rings I and II are used to make annular bonding interface specimens.

[0012] Furthermore, the S3 fixed body molded material tensile test specimen is prepared in the following specific steps:

[0013] 1): Cut the fixed body, mark the fixed body, use the special fixture of the milling machine to position the fixed body, separate the carbon fiber layer and the high silicon fiber layer from the fixed body, and use the saw blade milling cutter to cut the carbon fiber layer along the ring to obtain the carbon fiber layer tensile test specimen blank;

[0014] 2): Fix the tensile test specimen blank workpiece obtained in 1) on the worktable of the milling machine, roughly mill one plane of the workpiece along the circumferential direction perpendicular to the axis of the nozzle, turn the workpiece in the direction, and roughly mill another plane along the circumferential direction;

[0015] 3): Transfer the workpiece to the machining center, use a special fixture to position and clamp the workpiece, fine mill the upper and lower surfaces of the workpiece to meet the thickness dimensional accuracy requirements, transfer the workpiece to the milling machine, use a special fixture to position and clamp the workpiece, and rough mill the workpiece surface to meet the width and length requirements;

[0016] 4): Use a special fixture to position and clamp the workpiece, mill the two sides of the workpiece respectively, process the arc R20, and ensure the width dimensional accuracy requirements of the tensile fracture position. After one tensile specimen is processed, repeat the above steps to complete all tensile specimens.

[0017] Furthermore, the S3 fixed body molded material compression sample preparation specifically comprises the following steps:

[0018] 1): Cut the fixed body, mark the fixed body, use the special fixture of the milling machine to position the fixed body, separate the carbon fiber layer and the high silicon fiber layer from the fixed body, and use the saw blade milling cutter to cut the high silicon fiber layer along the ring to obtain the high silicon fiber layer compression sample blank;

[0019] 2): Fix the compression specimen blank workpiece obtained in 1) on the worktable of the milling machine, perform rough milling along the plane of the workpiece; and perform fine milling on the reference plane;

[0020] 3): Rough milling and fine milling of the two small end planes of the workpiece, while ensuring the parallelism and length dimension requirements of the compression specimen;

[0021] 4): Rough milling and fine milling are performed on the four sides of the workpiece, while ensuring the verticality and thickness requirements. After one compression specimen is processed, the above steps are repeated to complete all compression specimens.

[0022] Furthermore, the S4 spherical segment molded material tensile test specimen is prepared in the following specific steps:

[0023] 1): Cut the spherical segment, mark the spherical segment material, clamp the spherical segment with the clamping mechanism of the milling machine, and cut the saw blade milling cutter along the axis;

[0024] 2): Fix the workpiece obtained in 1) on the worktable of the milling machine, roughly mill one plane of the workpiece along the generatrix direction of the nozzle, turn the workpiece around, and roughly mill another plane along the generatrix direction of the nozzle;

[0025] 3): Transfer the workpiece to the machining center, use a special fixture to position and clamp the workpiece, and fine-mill the upper and lower surfaces of the workpiece to meet the thickness dimensional accuracy requirements;

[0026] 4): Transfer the workpiece to the milling machine, use a special fixture to position and clamp the workpiece, and rough mill the workpiece surface to meet the width and length requirements;

[0027] 5): Use a special fixture to position and clamp the workpiece, mill the two sides of the workpiece respectively, process the arc R20, and ensure the width dimensional accuracy requirements of the tensile fracture position. After one tensile specimen is processed, repeat the above steps to finally complete all tensile specimens.

[0028] Furthermore, the preparation of the small-sized interface shear specimens in the A and B zones of the S5 diffusion section winding material and the large-sized interface shear specimens in the C zone is carried out in the following specific steps:

[0029] 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section using the clamping mechanism of the milling machine, and cut the material along the axis of the saw blade milling cutter to obtain the shear specimen blank;

[0030] 2): Place the shear specimen blank on a special fixture of the milling machine, fix it, process the surface of the steel layer, ensure the thickness, turn the workpiece direction, mill each plane in turn, ensure the dimensional accuracy, until a small-size interface shear specimen is processed, repeat the above steps to finally complete all the shear specimens.

[0031] Furthermore, the method for preparing the sample of the S5 diffusion section winding material C zone tearing off comprises the following specific steps:

[0032] 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section using the clamping mechanism of the milling machine, and cut the material along the axis with a saw blade milling cutter to obtain the tear-off sample blank;

[0033] 2): Fix the tear-off specimen blank obtained in 1) on the milling machine for positioning and clamping, mill the metal surface along the generatrix direction to ensure the thickness of the metal layer, and cut two weakening grooves along the circumferential direction;

[0034] 3): Turn the workpiece, mill the non-metallic layer flat, mill the four sides, and one tear-off specimen is processed. Repeat the above steps to complete all tear-off specimens.

[0035] Furthermore, the S5 diffusion section winding material D zone ablation sample preparation method comprises the following specific steps:

[0036] 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section with the clamping mechanism of the milling machine, and cut the material along the axis with the saw blade milling cutter;

[0037] 2) Fix the ablation sample blank on the milling machine with a special fixture, roughly mill the upper surface along the generatrix direction, turn the workpiece to process the reference plane, turn the workpiece, and process another plane to ensure the parallelism and thickness requirements;

[0038] 3): Use a special fixture to position and clamp the workpiece, complete the cylindrical surface processing of the workpiece in the machining center, and complete the processing of one ablation sample. Repeat the above steps to complete all ablation samples.

[0039] Furthermore, the method for preparing the thermal conductivity sample of the D zone of the S5 diffusion section winding material comprises the following specific steps:

[0040] 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section using the clamping mechanism of the milling machine, and cut the thermal conductivity coefficient sample blank along the axis with a saw blade milling cutter;

[0041] 2): Fix the thermal conductivity test specimen obtained in 1) on the machining center with a special fixture, mill the upper surface along the generatrix direction, rotate the workpiece to process the reference plane, rotate the workpiece, and process the upper surface to ensure the parallelism and thickness requirements;

[0042] 3): Mill the cylindrical surface of the workpiece, and one thermal conductivity sample is processed. Repeat the above steps to complete all thermal conductivity samples.

[0043] Furthermore, the method for preparing the linear expansion coefficient sample of the D zone of the S5 diffusion section winding material comprises the following specific steps:

[0044] 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section with the clamping mechanism of the milling machine, and cut the material along the axis with the saw blade milling cutter;

[0045] 2): Position and clamp the linear expansion coefficient specimen on the milling machine table using a special fixture, use a saw blade milling cutter to cut it off along the annular direction from the small end, fix the workpiece on the three-jaw chuck of the lathe, turn the cylindrical surface of the workpiece, and turn the end plane;

[0046] 3): Turn the workpiece, turn another cylindrical surface of the workpiece, and cut the workpiece. One linear expansion coefficient specimen is processed. Repeat the above steps to complete all linear expansion coefficient specimens.

[0047] Furthermore, in the 2) processing of the steel layer surface, the small-sized interface shear specimen in zone A needs to mill the steel interface to retain 1 / 3 of the steel shell, and the small-sized interface shear specimen in zone B needs to mill the steel interface to retain the entire steel shell.

[0048] Furthermore, the annular bonding interface sample in the dissection of the diffusion section sample is obtained by decomposing it along the axial direction, and the diffusion section is cut into several annular structure rings I and II along the axial direction for making this sample.

[0049] The above one or more technical solutions of the present invention have at least one or more of the following technical effects:

[0050] The present invention provides detailed guidance for the nozzle dissection sampling work, can clarify the nozzle body dissection sample preparation process, and can effectively guide the nozzle body dissection sample preparation work.

[0051] The present invention provides a sample arrangement method, which cooperates with the processing technology to achieve the cutting and decomposition of the comprehensive test sample. The non-metallic material dissection conditions that make up the solid rocket engine nozzle have high requirements, and the sample preparation needs to be completed without damaging the interface structure of the test piece and the performance of the composite material structure.

[0052] The present invention aims to realize the preparation of performance test samples of the nozzle body of a solid rocket engine. According to the size and structural characteristics of the nozzle body, various test samples such as tensile samples, compression samples, ablation samples, interlaminar shear samples, interface shear samples, linear expansion coefficient samples, etc. are reasonably arranged, and the processing technology is coordinated to realize comprehensive testing of the nozzle body, comprehensively test the performance of the nozzle body, and make full use of the material.

[0053] The present invention analyzes the structure and material distribution information of the nozzle to be cut, arranges various test samples, and then adjusts the cutting direction, cutting position and cutting angle of the processing technology, thereby improving the precision level of the nozzle cutting machine and ensuring the cutting integrity of each characteristic area. At the same time, it also reduces the possibility of cutting failure of the nozzle specimen to be cut, improves the cutting quality of the nozzle specimen to be cut, reduces the possibility of causing cutting defects, and at the same time ensures the smoothness of the cutting surface, thereby improving the working efficiency of the nozzle cutting machine to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 :Schematic diagram of the basic components of the nozzle;

[0055] Figure 2 :Fixed body unloading flow chart;

[0056] Figure 3 :Fixed body molded material tensile specimen processing flow chart;

[0057] Figure 4 :Fixed body molded material compression specimen processing flow chart;

[0058] Figure 5 : Flow chart of spherical segment cutting;

[0059] Figure 6 :Tensile specimen processing flow chart;

[0060] Figure 7 : Diffusion section material discharge flow chart;

[0061] Figure 8 : Processing flow chart of interface shear specimens in zone A and zone B of the diffusion section;

[0062] Fig. 9 Processing flow chart of tear-off specimen in zone C of diffusion section;

[0063] Fig.10 : Material unloading flow chart of diffusion section D zone;

[0064] Fig.11 :Ablation sample processing flow chart;

[0065] Fig.12 : Thermal conductivity sample processing flow chart;

[0066] Fig.13 :Linear expansion coefficient sample processing flow chart;

[0067] Fig.14 : The specimen status of the nozzle fixed body, spherical segment and movable body after dissection;

[0068] Fig.15 : Flow chart of nozzle specimen preparation method. Specific implementation plan

[0069] A nozzle dissection method includes fixed body sample dissection, spherical section sample dissection and diffusion section sample dissection; the fixed body sample dissection is used to make tensile samples and compression samples; the spherical section sample dissection is used to make tensile samples; different sample parts of the diffusion section sample dissection will be used for different tests, namely shear samples; shear samples and tearing samples, ablation samples, thermal conductivity samples and linear expansion coefficient samples and annular bonding interface samples. The nozzle sample preparation method process is as follows Fig.15 shown.

[0070] In the dissection of fixed body specimens, the tensile specimens are cut by special machine tools and arranged in the circumferential direction perpendicular to the axis interface. In the dissection of fixed body specimens, the remaining thickness of the tensile specimens is used to make compression specimens, which are arranged in three circles in the circumferential direction. In the dissection of spherical segment specimens, the tensile specimens are cut by special machine tools.

[0071] Small-sized interface shear specimens in the dissection of the diffusion section specimens are obtained by decomposing along the axial direction. The diffusion section is mainly cut into several annular structures along the axial direction, of which area A and area B are used to make this specimen. Large-sized interface shear specimens and tear-off specimens in the dissection of the diffusion section specimens are obtained by decomposing along the axial direction. The diffusion section is mainly cut into several annular structures along the axial direction. Area C is used to make this specimen. Ablation specimens, thermal conductivity specimens and linear expansion coefficient specimens in the dissection of the diffusion section specimens are obtained by decomposing along the axial direction. The diffusion section is mainly cut into several annular structures along the axial direction. Area D is used to make this specimen. Annular bonding interface specimens in the dissection of the diffusion section specimens are obtained by decomposing along the axial direction. The diffusion section is mainly cut into several annular structures along the axial direction. Ring I and Ring II are used to make this specimen.

[0072] The present invention aims to realize the preparation of performance test samples of the solid rocket engine nozzle body. According to the size and structural characteristics of the nozzle body, a variety of test samples such as tensile test samples, compression test samples, ablation test samples, interlaminar shear test samples, interface shear test samples, linear expansion coefficient test samples are reasonably arranged, and the processing technology is coordinated to realize the comprehensive test of the nozzle body, comprehensively test the performance of the nozzle body, and make full use of the material. Set a reasonable cutting position and cutting angle to complete the sample preparation one by one and efficiently.

[0073] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the embodiments of the present invention and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the obtained embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0074] The basic components of a solid rocket engine nozzle include a fixed body, a spherical section, and a diffuser section, such as Figure 1 As shown. The test pieces for comprehensive testing of the nozzle body are obtained from these three components, including tensile specimens, compression specimens, ablation specimens, interlaminar shear specimens, interface shear specimens, linear expansion coefficient specimens, etc. The dissection work starts with removing the protruding metal connectors on the outside of the nozzle shell using a machine tool.

[0075] The nozzle is cut axially on a machine tool into three main components: a fixed body, a spherical section and a diffusion section.

[0076] (1) Dissection of fixed body specimens. This section is a molded test piece. It is obtained by disassembling along the axial direction and is used to make tensile specimens and compression specimens. A special machine tool is used for cutting. The tensile specimens are arranged in a circumferential direction perpendicular to the axial interface. A total of 6 pieces are cut. The remaining thickness is used to make compression specimens. They are arranged in three circles along the circumferential direction. A total of 64 pieces are cut. The specific fixed cutting process is as follows: Figure 1 As shown, the first step is to mark the fixed body; the second step is to position the fixed body using a special fixture of a milling machine; the third step is to clamp the fixed body using a clamping mechanism; the fourth step is to separate the carbon fiber layer and the high-silicon fiber layer from the fixed body; the fifth step is to mark the carbon fiber layer and the high-silicon fiber layer respectively; the sixth step is to position and clamp the fixed body of the carbon fiber layer and the high-silicon fiber layer respectively using a special fixture of a milling machine; the seventh step is to use a saw blade milling cutter to cut the carbon fiber layer and the high-silicon fiber layer along the ring respectively; the eighth step is to complete the operation of the carbon fiber layer tensile specimen blank and the operation of completing the high-silicon fiber layer compression specimen blank.

[0077] Use a special fixture to fix the tensile specimen blank workpiece on the milling machine table, and roughly mill one plane of the workpiece along the circumferential direction perpendicular to the nozzle axis; turn the workpiece in the direction and roughly mill another plane along the circumferential direction; transfer the workpiece to the machining center, use a special fixture to position and clamp the workpiece, and fine mill the upper and lower surfaces of the workpiece to meet the thickness dimensional accuracy requirements, that is, 4±0.1mm; transfer the workpiece to the milling machine, use a special fixture to position and clamp the workpiece, and roughly mill the workpiece surface to meet the width dimensional requirements of 25mm and the length dimensional requirements of 110mm; use a special fixture to position and clamp the workpiece, mill the two sides of the workpiece respectively, process the arc R20, and ensure the width dimensional accuracy requirements of the tensile fracture position, that is, 10±0.1mm; one tensile specimen is processed, and the processing flow is as follows Figure 2 As shown. Repeat this process until all the tensile specimens are completed and the position of the fixed tensile specimens is arranged. Fig.14 shown.

[0078] Use a special fixture to fix the compression specimen blank workpiece on the milling machine table, and perform rough milling on the plane of the workpiece; and perform fine milling on the reference plane; then perform rough milling and fine milling on the two small end planes of the workpiece, while ensuring parallelism and the compression specimen length dimension requirement of 25±0.05mm; then perform rough milling and fine milling on the four sides of the workpiece, while ensuring verticality and 10±0.1mm thickness dimension requirement. A compression specimen is processed, and the processing flow is as follows: Figure 3 As shown. Repeat this process until all compression samples are completed. The arrangement of the fixed body compression samples is shown in Fig.14 shown.

[0079] (2) Spherical segment specimen dissection: This segment is a molded test piece, which is obtained by disassembling along the axis. It is used to make tensile specimens. It is cut using a special machine tool. The specific fixed cutting process is as follows: Figure 4 As shown, the first step is to mark the spherical segment material; the second step is to use a special fixture for the milling machine to position the spherical segment; the third step is to use a clamping mechanism to clamp the spherical segment; the fourth step is to complete the operation of cutting the material along the axis of the saw blade milling cutter.

[0080] Use a special fixture to fix the workpiece on the milling machine table, and roughly mill one plane of the workpiece along the nozzle generatrix direction; turn the workpiece in the direction of the nozzle generatrix and roughly mill another plane; transfer the workpiece to the machining center, use a special fixture to position and clamp the workpiece, and fine mill the upper and lower surfaces of the workpiece to meet the thickness dimensional accuracy requirements, that is, 4±0.1mm; transfer the workpiece to the milling machine, use a special fixture to position and clamp the workpiece, and roughly mill the workpiece surface to meet the width dimensional requirements of 25mm and the length dimensional requirements of 110mm; use a special fixture to position and clamp the workpiece, mill the two sides of the workpiece respectively, process the arc R20, and ensure the width dimensional accuracy requirements of the tensile fracture position, that is, 10±0.1mm; a tensile specimen is processed, and the processing flow is as follows Figure 5 As shown. Repeat this process to complete all tensile specimens. The arrangement of the spherical tensile specimens is shown in Fig.14 shown.

[0081] (3) Dissection of the diffusion section specimen. This section is a winding test piece, which is obtained by decomposing it along the axial direction. The sampling is mainly to cut the diffusion section into several annular structures (A, B, C, D, I, II) along the axial direction. Among them, areas A and B are used to make small-sized interface shear specimens; area C is used to make large-sized interface shear specimens and tear-off specimens; area D is used to make ablation specimens, thermal conductivity specimens and linear expansion coefficient specimens; rings I and II are used to make annular bonding interface specimens. The specific fixed cutting process is as follows: Figure 6 As shown, the first step is to mark the diffusion section material; the second step is to use a special fixture for the milling machine to position the diffusion section; the third step is to use a clamping mechanism to clamp the diffusion section; the fourth step is to complete the operation of cutting the material along the axis with the saw blade milling cutter.

[0082] (3) Dissection of the diffusion section specimen. This section is a winding test piece, which is obtained by decomposing it along the axial direction. The sampling is mainly to cut the diffusion section into several annular structures (A, B, C, D, I, II) along the axial direction. Among them, areas A and B are used to make small-sized interface shear specimens; area C is used to make large-sized interface shear specimens and tear-off specimens; area D is used to make ablation specimens, thermal conductivity specimens and linear expansion coefficient specimens; rings I and II are used to make annular bonding interface specimens. The specific fixed cutting process is as follows: Figure 6 As shown, the first step is to mark the diffusion section material; the second step is to use a special fixture for the milling machine to position the diffusion section; the third step is to use a clamping mechanism to clamp the diffusion section; the fourth step is to complete the operation of cutting the material along the axis with the saw blade milling cutter.

[0083] The diffusion section A area is mainly decomposed to obtain non-full interface small-scale shear performance specimens. The diffusion section also needs to examine the full interface shear performance test, and the diffusion section B area is decomposed into full interface small-scale shear performance specimens. The processing technology of area A and area B is the same. Compared with the small-scale interface shear specimen in area A, it is necessary to mill the steel interface to retain 1 / 3 of the steel shell, and the small-scale interface shear specimen in area B needs to mill the steel interface to retain the entire steel shell.

[0084] In the diffuser section C area, along the nozzle direction, the annular specimen is cut into 31 rectangular blocks of equal width (55mm×30mm) using a special tool. A weakening groove is cut in the circumferential direction on the outer side of the rectangular block metal by horizontal milling. The groove width is no more than 3mm and the groove depth is 2mm. The full-size shear specimen has one weakening groove, and the tear-off specimen has two weakening grooves.

[0085] The tear-off specimen blank of the diffusion section C area is positioned and clamped on the milling machine using a special fixture, and the metal surface is milled flat along the generatrix direction to ensure that the metal layer thickness is 2mm. Two weakening grooves are cut along the circumferential direction, with a groove width of no more than 3mm and a groove depth of 3mm; the workpiece is turned, the non-metallic layer is milled flat to ensure a thickness of 10mm; the four sides are milled to ensure a length and width of 55mm and 25mm; a tear-off specimen is processed, and the processing flow is as follows Figure 8 As shown. Repeat this process until all the samples are pulled apart. The arrangement of the samples pulled apart in area C is shown in Fig.14 The processing technology of the full-size shear specimen in the diffusion section C is the same as that in the diffusion section A and B. Figure 8 shown.

[0086] Area D is used to make ablation specimens, thermal conductivity specimens and linear expansion coefficient specimens. The special machine tool has a 30mm diameter ablation specimen near the small end, a 50mm diameter thermal conductivity specimen near the large end, and a linear expansion specimen in the middle.

[0087] The schematic diagram of the arrangement of the ablation sample, thermal conductivity sample, and linear expansion sample in the diffusion section D area is shown in the figure. Fig.14 shown.

[0088] Fix the ablation sample blank on the milling machine with a special fixture, roughly mill the upper surface along the generatrix direction, turn the workpiece to process the reference plane; turn the workpiece and process another plane to ensure parallelism and 10mm thickness requirements; use a special fixture to position and clamp the workpiece, complete the workpiece cylindrical surface processing in the machining center to ensure the Φ30mm size requirement; one ablation sample is processed, and the processing flow is as follows Fig.10 As shown. This process is repeated until all ablation samples are completed. The ablation samples in the diffusion section D are arranged as shown in Fig.14 .

[0089] Fix the thermal conductivity coefficient sample blank to the machining center with a special fixture, mill the upper surface along the generatrix direction, turn the workpiece to machine the reference plane; turn the workpiece, machine the upper surface, ensure parallelism and 5mm thickness requirements; mill the cylindrical surface of the workpiece to ensure Φ55±5mm size requirements; a thermal conductivity coefficient sample is machined, and the machining process is as follows Fig.11 As shown. Repeat this process to complete all thermal conductivity samples. The thermal conductivity samples in the diffusion section D area are arranged as shown in Fig.14 .

[0090] The linear expansion coefficient sample blank is positioned and clamped on the milling machine workbench with a special fixture, and a saw blade milling cutter is used to mill it circumferentially from 15mm away from the small end; the workpiece is fixed on the three-jaw chuck of the lathe, and the cylindrical surface of the workpiece is turned to ensure the diameter size of Φ10mm, and the end plane is turned; the workpiece is turned, and the other cylindrical surface of the workpiece is turned to ensure the diameter size of Φ10mm, and the workpiece is turned to ensure the length size of 50mm. The processing of a linear expansion coefficient sample is completed. The processing flow is as follows: Fig.12 As shown. Repeat this process to complete all linear expansion coefficient samples. The linear expansion coefficient samples in the diffusion section D area are arranged as shown in Fig.14 shown.

[0091] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A nozzle dissection method, characterized in that , the specific steps are as follows: S1: Use a machine tool to remove the protruding metal connector on the outside of the nozzle shell; S2: Determine the sampling of the test piece of the nozzle anatomical specimen, wherein the nozzle body anatomical specimen is composed of a fixed body anatomical specimen, a spherical section anatomical specimen and a diffuser section anatomical specimen; S3: Dissect the fixed body specimen. This section is a molded test piece, which is obtained by dissecting along the axial direction and is used to make tensile specimens and compression specimens. S4: Dissection of the spherical segment specimen. This segment is a molded test piece, which is obtained by disassembly along the axial direction and is used to make a tensile specimen. S5: Dissect the diffusion section sample. This section is a winding test piece, which is obtained by decomposing along the axial direction. The sampling is mainly to cut the diffusion section into several annular structures (A, B, C, D, I, II) along the axial direction. Among them, areas A and B are used to make small-sized interface shear specimens; area C is used to make large-sized interface shear specimens and tear-off specimens; area D is used to make ablation specimens, thermal conductivity specimens and linear expansion coefficient specimens; rings I and II are used to make annular bonding interface specimens.

2. The nozzle dissection method according to claim 1, characterized in that: The S3 fixed body molded material tensile test specimen is prepared in the following specific steps: 1): Cut the fixed body, mark the fixed body, use the special fixture of the milling machine to position the fixed body, separate the carbon fiber layer and the high silicon fiber layer from the fixed body, and use the saw blade milling cutter to cut the carbon fiber layer along the ring to obtain the carbon fiber layer tensile test specimen blank; 2): Fix the tensile test specimen blank workpiece obtained in 1) on the worktable of the milling machine, roughly mill one plane of the workpiece along the circumferential direction perpendicular to the axis of the nozzle, turn the workpiece in the direction, and roughly mill another plane along the circumferential direction; 3): Transfer the workpiece to the machining center, use a special fixture to position and clamp the workpiece, fine mill the upper and lower surfaces of the workpiece to meet the thickness dimensional accuracy requirements, transfer the workpiece to the milling machine, use a special fixture to position and clamp the workpiece, and rough mill the workpiece surface to meet the width and length requirements; 4): Use a special fixture to position and clamp the workpiece, mill the two sides of the workpiece respectively, process the arc R20, and ensure the width dimensional accuracy requirements of the tensile fracture position. After one tensile specimen is processed, repeat the above steps to complete all tensile specimens.

3. The nozzle dissection method according to claim 1, characterized in that The S3 fixed body molded material compression sample preparation, the specific steps are as follows: 1): Cut the fixed body, mark the fixed body, use the special fixture of the milling machine to position the fixed body, separate the carbon fiber layer and the high silicon fiber layer from the fixed body, and use the saw blade milling cutter to cut the high silicon fiber layer along the ring to obtain the high silicon fiber layer compression sample blank; 2): Fix the compression specimen blank workpiece obtained in 1) on the worktable of the milling machine, perform rough milling along the plane of the workpiece; and perform fine milling on the reference plane; 3): Rough milling and fine milling of the two small end planes of the workpiece, while ensuring the parallelism and length dimension requirements of the compression specimen; 4): Rough milling and fine milling are performed on the four sides of the workpiece, while ensuring the verticality and thickness requirements. After one compression specimen is processed, the above steps are repeated to complete all compression specimens.

4. The nozzle dissection method according to claim 1, characterized in that: The S4 spherical segment molded material tensile test specimen is prepared in the following specific steps: 1): Cut the spherical segment, mark the spherical segment material, clamp the spherical segment with the clamping mechanism of the milling machine, and cut the saw blade milling cutter along the axis; 2): Fix the workpiece obtained in 1) on the worktable of the milling machine, roughly mill one plane of the workpiece along the generatrix direction of the nozzle, turn the workpiece around, and roughly mill another plane along the generatrix direction of the nozzle; 3): Transfer the workpiece to the machining center, use a special fixture to position and clamp the workpiece, and fine-mill the upper and lower surfaces of the workpiece to meet the thickness dimensional accuracy requirements; 4): Transfer the workpiece to the milling machine, use a special fixture to position and clamp the workpiece, and rough mill the workpiece surface to meet the width and length requirements; 5): Use a special fixture to position and clamp the workpiece, mill the two sides of the workpiece respectively, process the arc R20, and ensure the width dimensional accuracy requirements of the tensile fracture position. After one tensile specimen is processed, repeat the above steps to finally complete all tensile specimens.

5. The nozzle dissection method according to claim 1, characterized in that: The specific steps for preparing the small-sized interface shear specimens in the A and B zones of the S5 diffusion section winding material and the large-sized interface shear specimens in the C zone are as follows: 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section using the clamping mechanism of the milling machine, and cut the material along the axis of the saw blade milling cutter to obtain the shear specimen blank; 2): Place the shear specimen blank on a special fixture of the milling machine, fix it, process the surface of the steel layer, ensure the thickness, turn the workpiece direction, mill each plane in turn, ensure the dimensional accuracy, until a small-size interface shear specimen is processed, repeat the above steps to finally complete all the shear specimens.

6. The nozzle dissection method according to claim 1, characterized in that: The method for preparing the sample of the S5 diffusion section winding material C zone tearing off comprises the following specific steps: 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section using the clamping mechanism of the milling machine, and cut the material along the axis with a saw blade milling cutter to obtain the tear-off sample blank; 2): Fix the tear-off specimen blank obtained in 1) on the milling machine for positioning and clamping, mill the metal surface along the generatrix direction to ensure the thickness of the metal layer, and cut two weakening grooves along the circumferential direction; 3): Turn the workpiece, mill the non-metallic layer flat, mill the four sides, and one tear-off specimen is processed. Repeat the above steps to complete all tear-off specimens.

7. The nozzle dissection method according to claim 1, characterized in that: The method for preparing the ablation sample of the D zone of the winding material of the S5 diffusion section has the following specific steps: 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section with the clamping mechanism of the milling machine, and cut the material along the axis with the saw blade milling cutter; 2) Fix the ablation sample blank on the milling machine with a special fixture, roughly mill the upper surface along the generatrix direction, turn the workpiece to process the reference plane, turn the workpiece, and process another plane to ensure the parallelism and thickness requirements; 3): Use a special fixture to position and clamp the workpiece, complete the cylindrical surface processing of the workpiece in the machining center, and complete the processing of one ablation sample. Repeat the above steps to complete all ablation samples.

8. The nozzle dissection method according to claim 1, characterized in that: The method for preparing the thermal conductivity sample of the D zone of the S5 diffusion section winding material comprises the following specific steps: 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section using the clamping mechanism of the milling machine, and cut the thermal conductivity coefficient sample blank along the axis with a saw blade milling cutter; 2): Fix the thermal conductivity test specimen obtained in 1) on the machining center with a special fixture, mill the upper surface along the generatrix direction, rotate the workpiece to process the reference plane, rotate the workpiece, and process the upper surface to ensure the parallelism and thickness requirements; 3): Mill the cylindrical surface of the workpiece, and one thermal conductivity sample is processed. Repeat the above steps to complete all thermal conductivity samples.

9. The nozzle dissection method according to claim 1, characterized in that: The method for preparing the linear expansion coefficient sample of the D zone of the S5 diffusion section winding material comprises the following specific steps: 1): Fix the diffusion section and cut the material, mark the diffusion section material, clamp the diffusion section with the clamping mechanism of the milling machine, and cut the material along the axis with the saw blade milling cutter; 2): Position and clamp the linear expansion coefficient specimen on the milling machine table using a special fixture, use a saw blade milling cutter to cut it off along the annular direction from the small end, fix the workpiece on the three-jaw chuck of the lathe, turn the cylindrical surface of the workpiece, and turn the end plane; 3): Turn the workpiece, turn another cylindrical surface of the workpiece, and cut the workpiece. One linear expansion coefficient specimen is processed. Repeat the above steps to complete all linear expansion coefficient specimens.

10. The nozzle dissection method according to claim 5, characterized in that: The 2) processing of the steel layer surface, the small-sized interface shear specimen in zone A needs to mill the steel interface to retain 1 / 3 of the steel shell, and the small-sized interface shear specimen in zone B needs to mill the steel interface to retain the entire steel shell.

11. The nozzle dissection method according to claim 1, characterized in that: The annular bonding interface sample in the dissection of the diffusion section sample is obtained by decomposing it along the axial direction. The diffusion section is cut into several annular structures, Ring I and Ring II, along the axial direction for making this sample.

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