CN115673691B - Propellant storage tank flange shape and mounting hole precision mounting guaranteeing method - Google Patents
Propellant storage tank flange shape and mounting hole precision mounting guaranteeing method Download PDFInfo
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Abstract
The application relates to the technical field of processing and manufacturing of storage tanks, in particular to a method for ensuring the precision installation of the appearance and the installation hole of a flange of a propellant storage tank, which comprises the following steps: step 1: processing titanium alloy raw materials for manufacturing the propellant storage tank and the flange; step 2: machining the flange; step 3: assembling and welding the flange and the propellant storage tank shell; step 4: carrying out vacuum thermal shape correction treatment on the assembled and welded storage tank flange; step 5: fine-tuning the appearance of the flange, and marking a center reference of the mounting hole on the lug of the flange; step 6: positioning the reference of the mounting hole and machining; step 7: and detecting the appearance of the flange and the machined mounting hole with accuracy. The method and the device effectively solve the difficult problem of ensuring the precision of the flange shape and the mounting hole of the propellant storage tank caused by the welding deformation of the thin-wall shell and insufficient rigidity of the flange, and can meet the requirements of processing and ensuring the precision of the flange and the mounting hole of the titanium alloy propellant storage tank.
Description
Technical Field
The application relates to the technical field of processing and manufacturing of storage tanks, in particular to a method for ensuring the precision installation of the flange shape and the installation hole of a propellant storage tank.
Background
The propellant storage tank is a core component of a satellite, is installed in a satellite bearing cylinder through a flange, and is used for storing and managing the propellant and providing the engine or the thruster with the propellant without air inclusion under the specified flow and acceleration conditions. The shape precision of the flange and the hole precision of the mounting hole are decisive factors for determining whether the storage tank can be mounted smoothly, but the propellant storage tank shell and the flange are of titanium alloy thin-wall structures, the thickness of the shell is generally 0.8-2 mm, the thickness of the flange is generally 2-8 mm, gaps are uniformly distributed in the circumferential direction, the storage tank is of an all-welded structure, and the shape and the hole precision of the flange of the storage tank are ensured to be important problems in the manufacturing process of the storage tank due to the fact that the welding deformation of the thin-wall shell and the rigidity of the flange are insufficient.
The propellant storage tank is difficult to finish the processing and detection of the flange and the mounting hole after the welding of the whole storage tank by using high-precision numerical control processing equipment due to the limitation of the thin-wall structure and the external dimension, the traditional process method mainly adopts allowance for multiple processing, manual file trimming and shape correction and the like, the method has low processing efficiency and low precision, the installation of the storage tank and the satellite bearing barrel is difficult to finish at one time, and the flange structure and the internal quality defect are easily caused by multiple processing and file trimming and shape correction, so that the method has larger quality risk.
In recent years, with the increasing demands of large-scale, batch production and fast-paced tasks of the propellant storage tanks, the traditional process method is difficult to be suitable for the production and processing of the propellant storage tanks under new conditions, so that the process method capable of guaranteeing the flange shape and the mounting hole precision of the storage tanks with high quality and high efficiency is provided to become a key measure for guaranteeing the smooth production and delivery of the storage tanks.
Disclosure of Invention
The application provides a method for ensuring the precision installation of the flange shape and the mounting hole of a propellant storage tank, which can solve the difficult problem of ensuring the precision of the flange shape and the mounting hole of the propellant storage tank caused by the welding deformation of a thin-wall shell and insufficient rigidity of the flange.
In order to achieve the above purpose, the application provides a method for ensuring the precision installation of the flange shape and the installation hole of a propellant storage tank, which comprises the following steps: step 1: processing titanium alloy raw materials for manufacturing the propellant storage tank and the flange; step 2: machining the flange; step 3: assembling and welding the flange and the propellant storage box shell: step 4: carrying out vacuum thermal shape correction treatment on the assembled and welded storage tank flange; step 5: fine-tuning the appearance of the flange, and marking a center reference of the mounting hole on the lug of the flange; step 6: positioning the reference of the mounting hole and machining; step 7: and detecting the appearance of the flange and the machined mounting hole with accuracy.
Further, in step 1, the titanium alloy raw material is treated as follows: step 1.1: firstly, rough machining is carried out on a titanium alloy raw material, and single-side machining allowance of a blank is less than or equal to 10mm; step 1.2: carrying out blank stress annealing after finishing processing, wherein the heating temperature is 600-650 ℃, and the heat preservation time is 2-3 h; step 1.3: and (5) carrying out finish machining on the propellant storage tank shell according to the design drawing.
Further, in step 2, the flange is machined as follows: step 2.1: finishing the inner and outer surfaces and the wall thickness of the flange according to a design drawing; step 2.2: cutting to form lugs at each part of the flange by adopting a linear cutting mode, wherein the linear cutting speed is less than or equal to 1600-2500mm 2 A/min; step 2.3: after the processing is finished, the geometric dimension, the geometric tolerance and the surface roughness of the flange are detected.
Further, in step 3, the welding flange and the propellant reservoir housing are assembled in the following manner: step 3.1: cleaning and purifying the flange parts, so that the welded joint of the flange and the storage box is clean and pollution which affects the quality of the welded joint is avoided; step 3.2: assembling the flange and the storage box shell according to a design drawing; step 3.3: checking gaps and misalignment amount at the welding seam after assembly; step 3.4: after the gap and the offset are less than or equal to 0.2mm, spot welding is firstly carried out, the number of welding spots is 4-16, and then welding is carried out according to the sequence of sectionally symmetrical and uniformly distributed.
Further, in step 4, the vacuum thermal shaping treatment is performed in the following manner: step 4.1: placing the reference ring on the mounting bracket, mounting the storage box flange into the reference ring, and fixing and pressing the storage box flange by using the fixing ring and the bolt assembly; step 4.2: loading the storage tank and the fixing tool into heat treatment equipment; step 4.3: according to vacuum degree less than or equal to 2 x 10 -3 Pa, heating at 600-650 ℃ for 2-3 h; step 4.4: after the heat treatmentAfter completion, the tank flange is removed and the retaining ring is removed.
In step 5, the flange profile is fine tuned and marked as follows: step 5.1: measuring the external dimension and the flatness of the flange by taking the reference ring as a reference, and if the external dimension and the flatness do not meet the requirements, locally repairing and filing; step 5.2: after meeting the requirements, marking the center of the mounting hole on the upper surface of the lug of the flange according to the design drawing; step 5.3: in the marking process, marking a central reference circle line, and marking a central line uniformly distributed on the lugs, wherein the intersection point of the two lines is the reference of the central hole.
Further, in step 6, the following manner is adopted for positioning and machining the mounting hole reference: step 6.1: mounting the bracket and the drill bushing mounting ring on a working table of processing equipment; step 6.2: aligning the rotation axis of the workbench and the mounting ring axis of the drill bushing, and clamping the fixing bracket after the coaxiality of the rotation axis and the mounting ring axis of the drill bushing is less than or equal to 0.1 mm; step 6.3: mounting a storage tank flange into a drill bushing mounting ring, sequentially aligning the central hole datum of each position with the axis of the drill bushing, and fixing the storage tank by using a compression ring after the coaxiality deviation is less than or equal to 0.05 mm; step 6.4: starting processing equipment to sequentially process all mounting holes to a designed size, drilling a bottom hole in advance in the processing process, and then finishing the inner diameter or threads of the hole to the designed tolerance size; step 6.5: and after the processing is finished, the storage box flange is detached from the tool.
In step 7, the following method is adopted to detect the accuracy of the flange shape and the mounting hole: step 7.1: firstly, checking whether the dimension tolerance and the form and position tolerance of the flange appearance and the mounting hole meet the dimension of a design drawing or not according to the design drawing; step 7.2: then hoisting the storage tank into a checking fixture, and fitting the flange and the checking fixture; step 7.3: in the trial assembly process, the flange, the mounting hole and the checking fixture are required to be free from interference, the threaded hole is installed without being stagnant, each lug of the flange is free from distortion after the installation is completed, and the detection is qualified if the requirements are met.
Further, the wall thickness of the storage tank shell is 0.6mm-2mm, the flange is of an annular thin-wall structure, and the thickness is 1mm-10mm.
Further, in step 5.3, the number of the reference points of the central hole is 4-16, and the reference points are uniformly distributed along the axis of the storage tank.
The method for ensuring the precision installation of the flange shape and the mounting hole of the propellant storage tank has the following beneficial effects:
the method utilizes the technical characteristics of the titanium alloy raw materials and the structural characteristics of the appearance of the storage tank flange, adopts the technical methods of fine shaping of the thin-wall structure, high-precision machining of the mounting hole, simulation test-loading inspection and the like, effectively solves the difficult problem of ensuring the appearance of the flange and the precision of the mounting hole of the propellant storage tank caused by the welding deformation of the thin-wall shell and insufficient rigidity of the flange, has simple and efficient flow, has very strong universality, and can meet the machining and precision assurance of the titanium alloy propellant storage tank flange and the mounting hole with similar appearance dimensions and mounting principles. In addition, compared with the traditional process method, the flange can process the external dimension in place at one time in the part stage, the external dimension precision is guaranteed through correction and local engraving, the mounting hole precision is guaranteed through a processing tool and equipment after the external dimension precision meets the requirement, the quality risk brought by repeated processing and file correction in the traditional method is eliminated, and the production and processing of the propellant storage tank under the conditions of large scale, batch production and fast rhythm can be met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application and to provide a further understanding of the application with regard to the other features, objects and advantages of the application. The drawings of the illustrative embodiments of the present application and their descriptions are for the purpose of illustrating the present application and are not to be construed as unduly limiting the present application. In the drawings:
FIG. 1 is a flow diagram of a propellant tank flange profile and mounting hole accuracy installation assurance method provided in accordance with an embodiment of the present application;
FIG. 2 is a schematic structural view of a propellant tank flange and mounting hole provided in accordance with an embodiment of the present application;
FIG. 3 is a schematic structural view of a propellant tank flange vacuum thermal sizing tool assembly provided in accordance with an embodiment of the present application;
in the figure: 1-tank shell, 2-flange, 3-lug, 4-mounting hole, 5-weld, 6-fixed ring, 7-reference ring, 8-bolt assembly, 9-mounting bracket.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in FIG. 1, the method for ensuring the precision installation of the flange shape and the mounting hole of the propellant storage tank, provided by the embodiment of the application, can ensure the production of the propellant storage tank and the assembly with satellites with high quality and high efficiency, the external dimension of the propellant storage tank flange 2 processed and manufactured by adopting the method for ensuring the installation provided by the embodiment of the application meets the requirement of +/-0.1, the flatness meets the requirement of less than or equal to 0.2mm, and the position degree of the mounting hole 4 meets the requirement of being better than 0.1mm, and the method specifically comprises the following steps:
step 1: processing the titanium alloy raw materials for manufacturing the propellant storage tank and the flange 2; in the embodiment of the application, the titanium alloy raw material is preferably TC4 titanium alloy raw material, and the raw material is firstly subjected to rough machining and then is subjected to stress-relieving heat treatment in the following specific manner: step 1.1: firstly, rough machining is carried out on a titanium alloy raw material, and single-side machining allowance of a blank is less than or equal to 10mm; step 1.2: carrying out blank stress annealing after finishing processing, wherein the heating temperature is 600-650 ℃, and the heat preservation time is 2-3 h; step 1.3: the finishing of the propellant tank shell 1 is carried out according to the design drawing, so that the wall thickness of the tank shell 1 is ensured to be between 0.6mm and 2 mm.
Step 2: machining the flange 2; the method comprises the steps of finishing manufacturing a flange 2 by utilizing a TC4 titanium alloy raw material after heat treatment, wherein the flange 2 is of an annular thin-wall structure, the thickness is 1-10 mm, finishing the inner and outer surfaces and the wall thickness of the flange 2 to required sizes, and then finishing the appearance of an lug 3 by utilizing wire cutting, wherein the specific mode is as follows: step 2.1: finishing the inner and outer surfaces and the wall thickness of the flange 2 according to a design drawing; step 2.2: the lug 3 at each part of the flange 2 is cut by adopting a linear cutting mode, and the linear cutting speed is less than or equal to 1600-2500mm 2 /min, reducing process variationShape and ensuring the requirement of the roughness of the processed surface; step 2.3: after the machining is completed, the geometric dimensions, form and position tolerances and surface roughness of the flange 2 are checked.
Step 3: assembling and welding the flange 2 and the propellant storage tank shell 1; firstly, cleaning and purifying the flange 2, and then, assembling and welding the flange 2 and the propellant storage box shell 1, as shown in fig. 2, the concrete mode is as follows: step 3.1: cleaning and purifying the flange 2 parts, so that the welded junction of the flange 2 and the storage tank is clean and pollution which does not affect the quality of the welding line 5 is avoided; step 3.2: assembling the flange 2 and the storage box shell 1 according to a design drawing; step 3.3: checking gaps and misalignment amount at the weld joint 5 after assembly; step 3.4: after the gap and the offset are less than or equal to 0.2mm, spot welding is firstly carried out, the number of welding spots is 4-16, and then welding is carried out according to the sequence of sectionally symmetrical and uniformly distributed.
Step 4: carrying out vacuum thermal shape correction treatment on the assembled and welded storage tank flange 2; firstly, placing the storage tank flange 2 on a tool for fixing, as shown in fig. 3, and then, placing the storage tank flange 2 and the tool into vacuum heat treatment equipment for vacuum heat shape correction, wherein the specific mode is as follows: step 4.1: placing a reference ring 7 on a mounting bracket 9, placing the tank flange 2 into the reference ring 7, and fixing and pressing the tank flange 2 by using a fixing ring 6 and a bolt assembly 8, wherein the mounting bracket 9 is used for supporting the tank and preventing collision with the surface of the tank, the reference ring 7 is used for providing a thermal calibration reference and a fine adjustment measurement reference of the external dimension of the flange 2, and the fixing ring 6 is used for fixing and pressing the tank flange 2 and limiting the axial and radial displacement of the tank; step 4.2: loading the storage tank and the fixing tool into heat treatment equipment; step 4.3: according to vacuum degree less than or equal to 2 x 10 -3 pa, heating at 600-650 ℃ for 2-3 h; step 4.4: after the heat treatment is completed, the tank flange 2 is removed and the securing ring 6 is removed.
Step 5: fine-tuning the appearance of the flange 2, and marking the center reference of the mounting hole 4 on the lug 3 of the flange 2; after the vacuum thermal correction is completed, the storage box flange 2 takes a correction die as a reference, the external dimension of the flange 2 and the flatness of each lug 3 are measured, the external dimension of the flange 2 is finely adjusted according to the measurement result, after the design requirement is met, the center reference is marked according to the design dimension of the mounting hole 4, and the center reference is a cross line or a sample punching hole, and the concrete mode is as follows: step 5.1: measuring the external dimension and the flatness of the flange 2 by taking the reference ring 7 as a reference, and if the external dimension and the flatness do not meet the requirements, locally repairing and filing; step 5.2: after meeting the requirements, marking the center of the mounting hole 4 on the upper surface of the lug 3 of the flange 2 according to a design drawing; step 5.3: in the marking process, marking a central reference circle, marking central lines uniformly distributed on the lugs 3, wherein the intersection point of the two lines is the center Kong Jizhun, the number of reference points of the central holes is 4-16, and the central lines are uniformly distributed along the axis of the storage box.
Step 6: the mounting hole 4 is positioned as a reference and machined as follows: step 6.1: mounting a bracket and a drill bushing mounting ring on a workbench surface of processing equipment, wherein a mounting hole 4 processing tool is selected according to actual conditions, and the tool is similar to the tool in fig. 3, and comprises a bracket, the drill bushing mounting ring, a clamp ring and other part structures, wherein the bracket is used for supporting a storage box and fixing the storage box with the processing equipment, the drill bushing mounting ring is provided with a guide drill bushing for the mounting hole 4 during processing, the guide drill bushing provides mounting and positioning reference for the drill bushing, the clamp ring is used for fixing the storage box, and the storage box is prevented from displacing relative to the tool during processing; step 6.2: aligning the rotation axis of the workbench and the mounting ring axis of the drill bushing, and clamping the fixing bracket after the coaxiality of the rotation axis and the mounting ring axis of the drill bushing is less than or equal to 0.1 mm; step 6.3: the storage tank flange 2 is arranged in a drill bushing mounting ring, the standard of the central hole and the axis of the drill bushing hole at each position are aligned in sequence, and after the coaxiality deviation is less than or equal to 0.05mm, the storage tank is fixed by using a compression ring; step 6.4: starting processing equipment to sequentially process all mounting holes 4 to design dimensions, drilling a bottom hole in advance in the processing process, and finishing the inner diameter or threads of the hole to design tolerance dimensions; step 6.5: and after the processing is finished, the storage box flange 2 is detached from the tool.
Step 7: the appearance of the flange 2 and the machined mounting hole 4 are detected accurately, and the specific mode is as follows: step 7.1: firstly, checking whether the shape of the flange 2, the size tolerance and the form and position tolerance of the mounting hole 4 meet the size of a design drawing or not according to the design drawing; step 7.2: then hoisting the storage tank into a checking fixture, and fitting the flange 2 and the checking fixture; step 7.3: in the trial assembly process, the checking fixture is mainly used for simulating the mounting structure of the bearing cylinder and the storage box flange 2, the geometric dimensional tolerance and the form and position tolerance of the checking fixture are superior to or equal to the actual geometric dimensional tolerance and form and position tolerance of the bearing cylinder, the flange 2, the mounting hole 4 and the checking fixture are required to be free from interference, the threaded hole is not blocked, each lug 3 of the flange 2 is not distorted after the installation is finished, and the checking is qualified if the requirements are met.
More specifically, in the above steps, the flange 2 is protected during the processes of installing, transferring and filing the flange 2 of the storage tank, so as to prevent permanent deformation and mechanical damage caused by extrusion and collision, and geometric dimensional tolerance and form and position tolerance of the process assembly of the reference ring 7, the drill bushing mounting ring, the checking fixture and the like used in the above steps are superior to those of the design value of the flange 2 of the storage tank, and meanwhile, the process equipment can be used after regular standard inspection is qualified, so that the precision reduction caused by failure deformation and use abrasion is prevented.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (7)
1. The method for ensuring the precision installation of the profile and the installation hole of the propellant storage tank flange is characterized by comprising the following steps:
step 1: processing titanium alloy raw materials for manufacturing the propellant storage tank and the flange; the titanium alloy raw material adopts TC4 titanium alloy raw material, firstly carries out rough machining on the raw material, and then carries out stress-relief heat treatment, and the concrete mode is as follows:
step 1.1: firstly, rough machining is carried out on a titanium alloy raw material, and single-side machining allowance of a blank is less than or equal to 10mm;
step 1.2: carrying out blank stress annealing after finishing processing, wherein the heating temperature is 600-650 ℃, and the heat preservation time is 2-3 h;
step 1.3: finish machining of the propellant storage tank shell is carried out according to a design drawing, and the wall thickness of the storage tank shell is ensured to be between 0.6mm and 2 mm;
step 2: machining the flange; the method comprises the steps of finishing manufacturing a flange by utilizing a TC4 titanium alloy raw material after heat treatment, wherein the flange is of an annular thin-wall structure and has a thickness of 1-10 mm, finishing the inner appearance surface and the wall thickness of the flange to required sizes, and then finishing the appearance of the lug by utilizing wire cutting, wherein the specific mode is as follows:
step 2.1: finishing the inner and outer surfaces and the wall thickness of the flange according to a design drawing;
step 2.2: cutting to form lugs at each part of the flange by adopting a linear cutting mode, wherein the linear cutting speed is less than or equal to 1600-2500mm 2 And/min, reducing the processing deformation and ensuring the processing surface roughness;
step 2.3: after the processing is finished, detecting the geometric dimension, the geometric tolerance and the surface roughness of the flange;
step 3: assembling and welding the flange and the propellant storage tank shell; firstly cleaning and purifying the flange, and then assembling and welding the flange and the propellant storage box shell, wherein the specific mode is as follows:
step 3.1: cleaning and purifying the flange parts, so that the welded joint of the flange and the storage box is clean and pollution which affects the quality of the welded joint is avoided;
step 3.2: assembling the flange and the storage box shell according to a design drawing;
step 3.3: checking gaps and misalignment amount at the welding seam after assembly;
step 3.4: after the gap and the offset are less than or equal to 0.2mm, spot welding is firstly carried out, the number of welding spots is 4-16, and then welding is carried out according to the sequence of sectionally symmetrical and uniformly distributed;
step 4: carrying out vacuum thermal shape correction treatment on the assembled and welded storage tank flange;
step 5: fine-tuning the appearance of the flange, and marking a center reference of the mounting hole on the lug of the flange;
step 6: positioning the reference of the mounting hole and machining;
step 7: and detecting the appearance of the flange and the machined mounting hole with accuracy.
2. The method for ensuring the precision installation of the flange profile and the mounting hole of the propellant tank according to claim 1, wherein in the step 4, the vacuum thermal shaping treatment is performed by adopting the following modes:
step 4.1: placing the reference ring on the mounting bracket, mounting the storage box flange into the reference ring, and fixing and pressing the storage box flange by using the fixing ring and the bolt assembly;
step 4.2: loading the storage tank and the fixing tool into heat treatment equipment;
step 4.3: according to vacuum degree less than or equal to 2 x 10 -3 Pa, heating at 600-650 ℃ for 2-3 h;
step 4.4: after the heat treatment is completed, the storage tank flange is taken out, and the fixing ring is taken down.
3. The method for ensuring the precision installation of the flange profile and the mounting hole of the propellant tank according to claim 2, wherein in the step 5, the flange profile is finely adjusted and marked in the following manner:
step 5.1: measuring the external dimension and the flatness of the flange by taking the reference ring as a reference, and if the external dimension and the flatness do not meet the requirements, locally repairing and filing;
step 5.2: after meeting the requirements, marking the center of the mounting hole on the upper surface of the lug of the flange according to the design drawing;
step 5.3: in the marking process, marking a central reference circle line, and marking a central line uniformly distributed on the lugs, wherein the intersection point of the two lines is the reference of the central hole.
4. A propellant tank flange profile and mounting hole accuracy mounting assurance method as claimed in claim 3, wherein in step 6, the mounting hole datum location and machining is performed as follows:
step 6.1: mounting the bracket and the drill bushing mounting ring on a working table of processing equipment;
step 6.2: aligning the rotation axis of the workbench and the mounting ring axis of the drill bushing, and clamping the fixing bracket after the coaxiality of the rotation axis and the mounting ring axis of the drill bushing is less than or equal to 0.1 mm;
step 6.3: mounting a storage tank flange into a drill bushing mounting ring, sequentially aligning the central hole datum of each position with the axis of the drill bushing, and fixing the storage tank by using a compression ring after the coaxiality deviation is less than or equal to 0.05 mm;
step 6.4: starting processing equipment to sequentially process all mounting holes to a designed size, drilling a bottom hole in advance in the processing process, and then finishing the inner diameter or threads of the hole to the designed tolerance size;
step 6.5: and after the processing is finished, the storage box flange is detached from the tool.
5. The method for ensuring the precision installation of the flange shape and the mounting hole of the propellant tank according to claim 4, wherein in the step 7, the precision detection of the flange shape and the mounting hole is performed by adopting the following modes:
step 7.1: firstly, checking whether the dimension tolerance and the form and position tolerance of the flange appearance and the mounting hole meet the dimension of a design drawing or not according to the design drawing;
step 7.2: then hoisting the storage tank into a checking fixture, and fitting the flange and the checking fixture;
step 7.3: in the trial assembly process, the flange, the mounting hole and the checking fixture are required to be free from interference, the threaded hole is installed without being stagnant, each lug of the flange is free from distortion after the installation is completed, and the detection is qualified if the requirements are met.
6. The method for ensuring the precise installation of the appearance and the installation hole of the flange of the propellant tank according to claim 1, wherein the wall thickness of the tank shell is 0.6mm-2mm, the flange is of an annular thin-wall structure, and the thickness is 1mm-10mm.
7. A propellant tank flange profile and mounting hole precision installation assurance method as claimed in claim 3, characterized in that in step 5.3, the number of centre hole datum points is 4-16, evenly distributed along the tank axis.
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