A method of processing a composite cabin section

Abstract

This invention discloses a machining method for a combined compartment, belonging to the field of machining technology for large combined compartments. This method is used to machine a combined compartment having three sequentially connected compartments. The method includes: pre-machining the three compartment blanks separately to obtain three machined shells; pre-assembling the three machined shells to obtain a combined shell; and finishing the combined shell to the design dimensions to obtain the combined compartment. This invention pre-machines each compartment separately, leaving remaining cutting material on its outer surface, and then pre-assembles the three machined shells before finishing the outer surface. This ensures the consistency of the combined compartment's shape, eliminating steps and resulting in good surface quality. Furthermore, pre-assembling the three machined shells and then finishing them as a whole ensures overall machining accuracy.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of machining of large-scale combined cabin section, and particularly relates to a machining method of a combined cabin section. BACKGROUND

[0002] The combined cabin is formed by assembling multiple cabin sections, and comprises a head, a front measuring cabin and a rear measuring cabin connected in sequence. The head is provided with a tip and an inner cavity with an opening. The front measuring cabin and the rear measuring cabin are both provided with inner holes in communication with each other and with the inner cavity. The combined cabin can be used as a carrier for space flight test and as a mounting structure for various sensors such as rate sensors, and therefore is required to have stable functions and precision in flight test to ensure accurate test results.

[0003] In the prior art, the combined cabin is generally obtained by first machining the head, the front measuring cabin and the rear measuring cabin respectively, and then assembling the head, the front measuring cabin and the rear measuring cabin. However, since the combined cabin has an axial dimension close to 3 meters, the dimension is very large, and the cross-sectional dimension of the combined cabin perpendicular to the axial direction is a polygon with irregular changes along the axial direction, it is difficult to ensure smooth transition between the two adjacent structural parts. SUMMARY

[0004] To solve the above technical problems, the present application provides a machining method of a combined cabin section, which ensures the consistency of the shape of the combined cabin section, has no steps and good apparent quality. Meanwhile, the three machined shells are pre-assembled and then finished as a whole, which can also ensure the machining precision of the whole.

[0005] The technical scheme adopted by the present application is as follows: a machining method of a combined cabin section is provided, which is used for machining a combined cabin section having three cabin sections connected in sequence. The machining method comprises the following steps:

[0006] Preliminarily machining three cabin section blanks to obtain three machined shells;

[0007] Pre-assembling the three machined shells to obtain a combined shell;

[0008] Finishing the combined shell to a design size to obtain a combined cabin section.

[0009] In some embodiments, after the preliminary machining, the outer shape surface of each of the three machined shells has a remaining cutting amount of 0.4-0.6 mm, and the inner shape surface of each of the three machined shells is of the design size.

[0010] In some embodiments, the three machined shells are pre-assembled by using a pre-assembly tool. The pre-assembly tool comprises:

[0011] A mounting structure provided with a plurality of fixing positions for fixing the combined shell, which are arranged along the axial direction of the combined shell in sequence and at intervals.

[0012] an end fixing plate located on one side of the plurality of fixing positions and detachably connected to the mounting structure, a side surface of the end fixing plate being used to abut against an end surface of the combined shell.

[0013] In some embodiments, the mounting structure comprises:

[0014] a base plate connected to the end fixing plate;

[0015] a plurality of support members connected to the base plate in sequence and at intervals along the axial direction of the combined cabin section, and provided with support surfaces matched with the outer surface of the combined shell, the support members being connected with fixing members used to fix the combined shell, and the plurality of fixing members and the support members forming the fixing positions.

[0016] In some embodiments, the fixing members connected to the support members at the middle are two threaded fasteners respectively connected to the process tables on both sides of the combined shell in the width direction, and the thickness center lines of the process tables on both sides of the combined shell in the width direction are coplanar with the symmetry plane of the combined shell passing through the center axis.

[0017] In some embodiments, the combined cabin section is provided with an opposite tip end and a large end, and the radial dimension of the combined cabin section increases in sequence from the tip end to the large end.

[0018] The fixing members connected to the support members below the tip end are pressing strips used to abut against the tip end, the side surface of the end fixing plate is used to abut against the end surface of the large end of the combined shell, and the base plate is provided with a limiting groove into which the end fixing plate is embedded.

[0019] In some embodiments, the three cabin sections are an end head, a pre-measurement cabin section and a post-measurement cabin section connected in sequence, the end head is provided with a tip end, the axial length of the pre-measurement cabin section is ≥1000 mm, and the pre-measurement cabin section and the post-measurement cabin section are both provided with through inner cavities, and the two inner cavities are connected in sequence.

[0020] In some embodiments, the pre-measurement cabin section comprises a lower shell with an opening on the peripheral surface and an upper shell connected to the opening, and the upper shell is provided with a plurality of mounting holes,

[0021] The preliminary processing steps of the upper shell comprise:

[0022] roughly processing the outer surface and the inner surface of the upper shell;

[0023] ageing treatment;

[0024] semi-finish processing the outer surface, the inner surface and the side surface of the upper shell;

[0025] Finish the side surface, each mounting hole and the assembly surface of the lower shell, the recess size of the mounting hole matches each mounting structure;

[0026] The preliminary processing step of the lower shell comprises:

[0027] Roughly process the inner profile surface, the outer profile surface, each end surface, the end frame and the opening of the lower shell;

[0028] Aging treatment;

[0029] Semi-finish the outer profile surface, each end surface, the inner profile surface and the opening of the lower shell;

[0030] Finish the opening and each end surface of the lower shell, the recess size of the opening matches the outer size of the upper shell.

[0031] In some embodiments, the preliminary processing step of the end head comprises:

[0032] Roughly process the outer profile surface and the weight-reducing groove of the end head;

[0033] Semi-finish the outer profile surface and the large end surface of the end head to a single-side remaining cutting amount of 0.4-0.6mm;

[0034] Finish the weight-reducing groove and the large end surface to the design size;

[0035] The preliminary processing step of the measured rear cabin section comprises:

[0036] Roughly process each end surface, the inner profile surface and the outer profile surface of the measured rear cabin section;

[0037] Semi-finish each end surface, the inner profile surface and the outer profile surface of the measured rear cabin section to a single-side remaining cutting amount of 0.3-0.8mm;

[0038] Finish each end surface and the inner profile surface of the measured rear cabin section to the design size.

[0039] In some embodiments, one mounting structure of the measured front cabin section is a mounting block provided with a plurality of through grooves, the mounting hole is processed through the through groove structure by wire cutting, and the cutting wire is a molybdenum wire.

[0040] The beneficial effects of the present application at least include:

[0041] The application provides a processing method of a combined cabin section, which is used for processing a combined cabin section with three cabin sections connected in sequence, and comprises the following steps: respectively preliminarily processing three cabin section blanks to obtain three processed shells; pre-assembling the three processed shells to obtain a combined shell; and precisely processing the combined shell to a design size to obtain the combined cabin section. The application preliminarily processes each cabin section of the combined cabin section respectively, and the outer shape of each cabin section has a residual cutting amount after processing, then the three processed shells are pre-assembled and the outer shape is precisely processed, so that the consistency of the outer shape of the combined cabin section is ensured, there is no step, and the apparent quality is good; meanwhile, the three processed shells are pre-assembled and precisely processed as a whole, so that the processing precision of the whole is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 A structural schematic diagram of a combined cabin section is shown.

[0043] Figure 2 A top view of the combined cabin section is shown. Figure 1

[0044] Figure 3 A cooperation diagram of the end head and a first support clamp during the preliminary processing of the end head is shown.

[0045] Figure 4 A cooperation diagram of the end head and a second support clamp during the preliminary processing of the end head is shown.

[0046] Figure 5 A cooperation diagram of the upper shell and a first upper shell clamp during the preliminary processing of the upper shell is shown.

[0047] Figure 6 A top view of the combined shell is shown. Figure 5

[0048] A cooperation diagram of the upper shell and a second upper shell clamp during the preliminary processing of the upper shell is shown. Figure 7

[0049] A top view of the combined shell is shown. Figure 8 Figure 7 A cooperation diagram of the lower shell and a lower shell clamp during the preliminary processing of the lower shell is shown.

[0050] Figure 9 A cooperation diagram of the lower shell and the lower shell clamp after the turning of the lower shell is shown.

[0051] Figure 10 A structural schematic diagram of a mounting block is shown.

[0052] Figure 11 A cooperation diagram of a pre-assembly tool and the combined shell is shown.

[0053] Figure 12 A cooperation diagram of a pre-assembly tool and the combined shell is shown.

[0054] REFERENCE SIGNS:​​

[0055] 200 - first support clamp, 210 - first backing plate, 220 - first backing block;

[0056] 300 - second support clamp, 310 - first support plate;

[0057] 400 - first upper shell clamp, 410 - second backing plate, 420 - second backing block;

[0058] 500 - second upper shell clamp, 510 - third backing plate, 520 - third backing block, 530 - pressing block;

[0059] 600 - lower shell clamp, 610 - second support plate, 620 - fourth backing plate

[0060] 700 - pre-assembly tooling, 710 - base plate, 711 - limiting groove, 720 - support piece, 730 - threaded fastener, 740 - pressing strip, 750 - end plate fixing plate, 751 - pressing hole, 760 - pressing plate.

[0061] 800 - combined cabin section; 810 - end head, 810a - process table of end head, 820 - pre-measurement cabin section, 821 - upper shell, 821a - process table of upper shell, 822 - lower shell, 822a - process table of lower shell, 823 - mounting block, 823a - through groove, 830 - post-measurement cabin section. DETAILED DESCRIPTION

[0062] In order to make the person skilled in the art to which the present application belongs more clearly understand the present application, the technical scheme of the present application will be described in detail below with specific embodiments in combination with the drawings.

[0063] In order to solve the technical problem that the combined cabin section with large axial size and variable radial size is prone to have stepped sections in the outer size, affecting the appearance of the combined cabin section, the embodiment of the present application provides a processing method of a combined cabin section, which is used for processing a combined cabin section with three cabin sections connected in sequence.

[0064] Please refer to Figure 1 and Figure 2 , the length of the combined cabin section 800 is greater than or equal to 2500 mm, various sensors such as temperature sensors, speed sensors and thermocouples can be provided, the three cabin sections are an end head 810, a pre-measurement cabin section 820 and a post-measurement cabin section 830 connected in sequence, the end head 810 is provided with a pointed end, which can be duckbill-shaped, the axial length of the pre-measurement cabin section 820 is greater than or equal to 1000 mm, the pre-measurement cabin section 820 and the post-measurement cabin section 830 are both provided with through inner cavities, and the two inner cavities are in sequence communication.

[0065] The processing method of the combined cabin section 800 provided by the embodiment of the present application comprises:

[0066] S1, respectively, three cabin segment blanks are initially processed to obtain three processed shells;

[0067] The three cabin segment blanks are initially processed to retain a certain amount of cutting of the outer surface, and the processing is simple and flexible. The three cabin segment blanks are stainless steel forgings, for example, the material can be selected as 20Cr13. The three stainless steel forgings can be in a solid solution treatment state, or a solid solution treatment step can be added after rough machining. The timing of the solid solution treatment is not limited by the present application.

[0068] In some embodiments, after the initial processing is completed, the outer surface of each of the three processed shells has a remaining cutting amount of 0.4-0.6 mm, and the overall assembled shell is machined to the design size during finishing. Since the total length of the three processed shells exceeds 2500 mm after pre-assembly, the total length is very long, and it is difficult to process the inner surface, therefore, after the initial processing is completed, the inner surface of the three processed shells is of the design size.

[0069] The specific process of initially processing the three cabin segment blanks will be introduced below:

[0070] The initial processing steps of the end head 810, which is the cabin segment located at the most end, can include:

[0071] Step 1: Rough machining of the outer surface and weight reduction groove of the end head 810; the outer surface of the end head 810 is machined according to the outer shape requirements, and the outer periphery of the end head 810 is provided with six surfaces. In other embodiments, the outer periphery of the end head 810 can also be provided with eight surfaces or other quantities, which are not limited by the present application. Rough machining of the outer surface of the end head 810 can include three steps. First, the outer surface is machined to a remaining cutting amount of 4-6 mm; please refer to Figure 3 A plurality of, for example, four or six process platforms 810a are machined on the end head 810 blank, and process holes are machined on the process platform 810a to facilitate clamping with the support clamp. The process platform 810a can be machined to the target size during rough machining, and one side of the process platform 810a in the thickness direction can be used as a reference surface for subsequent finishing, without the need to change the pressure plate 760. Secondly, the weight reduction groove is coarsely milled under the clamping action of the first support clamp 200, with a single-sided remaining cutting amount of 1-3 mm, wherein the process platform 810a can be used as a clamping reference and a sampling reference after turning over. Finally, aging treatment is performed to remove the stress generated during machining. The aging treatment can be natural aging or artificial aging. Please refer to Figure 3The first support clamp 200 comprises a first backing plate 210 and a plurality of groups of backing blocks which are spaced along the axial direction of the end head 810, each group of backing blocks comprising two first backing blocks 220 which are arranged opposite to each other in a direction perpendicular to the axial direction, the number of the first backing blocks 220 being the same as the number of the process tables 810a of the end head 810, and the process table 810a being connected to the corresponding first backing block 220 by a threaded member which extends into the process hole.

[0072] Step 2: semi-finishing the outer profile surface and the large end surface of the end head 810 to a single-side remaining cutting amount of 0.4-0.6 mm;

[0073] The outer profile surface is processed to a single-side remaining cutting amount of 0.4-0.6 mm, which is the remaining amount for the overall cutting of the combined shell. The outer profile surface and the large end surface of the semi-finishing milling end head 810 can be used.

[0074] Step 3: finishing the weight-reducing groove and the large end surface to the design size;

[0075] The finishing can be performed by using a precision milling method to process the weight-reducing groove and the large end surface. In this step, at least four end surface holes can also be processed on the large end surface. The end surface holes can be provided with 8, 10, or other numbers. At least two of the end surface holes can be used as positioning holes to position the second support clamp 300, and then the second support clamp 300 is used to fix the end head 810 to remove the process table 810a. The remaining end surface holes except the positioning holes can be used as connecting holes to connect the second support clamp 300.

[0076] Specifically, please refer to Figure 4 The second support clamp 300 comprises a first support plate 310 and a positioning member which is connected to the top surface of the first support plate 310. The positioning member is a positioning pin. The top surface of the first support plate 310 is a reference surface. The end head 810 is positioned by the positioning member on the top surface of the first support plate 310 through the positioning holes on the end surface. The end head 810 is connected to the first support plate 310 through the threaded members which extend into the connecting holes. The first support plate 310 is provided with threaded holes which are matched with T-shaped grooves of the workbench of the machining machine tool. The first support plate 310 is fixed to the workbench of the machining machine tool by bolts which extend into the threaded holes and the T-shaped grooves.

[0077] The preliminary machining of the measurement front cabin section 820 is as follows: the axial dimension of the measurement front cabin section 820 is very large, and the measurement front cabin section 820 is difficult to be machined as a whole. Therefore, the preliminary machining of the measurement front cabin section 820 is performed in two parts. The measurement front cabin section 820 comprises a lower shell 822 which has an opening on the peripheral surface and an upper shell 821 which is connected to the opening. The upper shell 821 is provided with a plurality of mounting holes. The preliminary machining of the measurement front cabin section 820 comprises the preliminary machining of the upper shell 821 and the preliminary machining of the lower shell 822. The two parts are described below.

[0078] The preliminary machining step of the upper shell 821 includes:

[0079] Step 1: Rough machining the outer surface and the inner surface of the upper shell 821;

[0080] The inner surface here is the surface constituting the inner profile of the measurement front cabin section 820, and the outer surface is the surface constituting the outer profile of the measurement front cabin section 820. The rough machining stage can include, in sequence, a first rough machining, an aging treatment, and a second rough machining, to fully release the stress generated in the machining process and improve the machining efficiency. The first rough machining can use a large tool with a diameter of 20mm to 80mm, for example, a tool with a diameter of 32mm, and a large cutting amount, for example, a cutting depth of 0.5mm or more, to improve the machining efficiency. After the first rough machining is completed, the single-sided cutting residual amount of the outer surface and the inner surface can be 4mm to 6mm. During the first rough machining, multiple process platforms 821a, for example, 6 process platforms 821a, can also be machined. The process platforms 821a are machined to the target size in the rough machining, and one side of the process platform 821a in the thickness direction serves as a reference surface. In this way, the machining of the reference surface can be completed in one clamping without the need to reverse the pressure plate 760. The aging treatment can be natural aging or artificial aging. If natural aging is selected, the aging treatment time is ≥24h. The second rough machining can use a small tool with a diameter of 6mm to 16mm, for example, 12mm, and a small cutting amount, for example, 0.1mm to 0.5mm, for example, 0.3mm, to control the deformation. After this process is completed, the single-sided cutting residual amount of the inner surface and the outer surface is 1mm to 3mm.

[0081] The second rough machining can be performed by clamping and fixing with the first upper shell clamp 400. In some embodiments, please refer to Figure 5 and Figure 6 The first upper shell clamp 400 includes a second backing plate 410 and multiple groups of spacer blocks spaced along the axial direction of the end head 810. Each group of spacer blocks includes two second spacer blocks 420 arranged opposite to each other in a direction perpendicular to the axial direction. The number of second spacer blocks 420 is the same as the number of process platforms 821a of the upper shell 821. The process platform 821a is connected to the corresponding second spacer block 420 through a threaded member extending into the process hole.

[0082] Step 2: Aging treatment, which can be natural aging ≥24h, to balance with the environment and detect the size and deformation.

[0083] Step 3: Semi-finishing machining the outer surface, the inner surface, and the side surface of the upper shell 821;

[0084] Considering the influence of deformation in the product finishing process, the processing amount should be reduced as much as possible, and sufficient allowance should be left. After semi-finishing, the outer surface, inner surface and side surface each leave a 0.5mm allowance. The side surface is the surface in contact with the opening of the lower shell 822. The semi-finishing step can also use the upper shell 821 clamp to clamp and fix the upper shell 821.

[0085] Step 4: Finish the side surface, each mounting hole and the assembly surface with the lower shell 822. The mounting hole has a sinking size matched with each to-be-mounted part.

[0086] The finishing stage can use the second upper shell clamp 500 to clamp and fix the shell. Please refer to Figure 7 and Figure 8 , the second upper shell clamp 500 includes a third backing plate 510, a third backing block 520 and a pressing block 530. The third backing plate 510 is a conformal backing plate, which is arranged to protect the upper shell 821 during processing and has sufficient rigidity to avoid vibration. The third backing block 520 and the pressing block 530 are the same number and are correspondingly arranged. The third backing block 520 is provided in plurality, and the plurality of third backing blocks 520 are arranged around the outside of the upper shell 821. One end of the pressing block 530 is connected to the third backing block 520, and the other end is used to press on the upper shell 821. The to-be-mounted part matched with the sinking size of the mounting hole includes a mounting block 823 and various sensors, etc. The sinking size of the mounting hole for mounting the mounting block 823 is processed according to the measured value of the outer dimension of the mounting block 823, and meets the assembly clearance requirement of 0.05mm.

[0087] The preliminary processing steps of the lower shell 822 include:

[0088] Step 1: Roughly process the inner profile surface, outer profile surface, each end surface, end frame and opening of the lower shell 822.

[0089] The rough machining stage can include a first rough machining, an aging treatment and a second rough machining arranged in sequence. After the first rough machining, the single-side remaining cutting amount of the inner profile, the outer profile, the large end surface and the small end surface and the single-side remaining cutting amount of the end frame are all 4-6 mm. The first rough machining at the opening includes a concave surface. The first rough machining can also machine multiple process platforms 822a. The process platforms 822a can be multiple groups. Each group of process platforms 822a includes two process platforms 822a. The two process platforms 822a are located on both sides of the lower shell 822 in the width direction. The thickness center lines of the two process platforms 822a are coplanar with the symmetry plane of the center axis of the measurement front cabin section 820. The multiple groups of process platforms 822a are distributed along the axial direction of the lower shell 822. The upper surface and the lower surface of the process platform 822a in the thickness direction can be used as a process reference to realize the subsequent second rough machining and the finishing machining of the combined shell. The thickness center line of the process platform 822a can also be used as a reference to ensure the assembly accuracy of the other two machined shells and the measurement front cabin section 820. After the process platform 822a is machined, the outer profile of the back surface of the process platform 822a can be machined by using the lower shell clamp 600 for clamping and fixing. The single-side remaining cutting amount is 4-6 mm. The aging treatment can be natural aging to release stress and detect deformation.

[0090] Please refer to Figure 9 The lower shell clamp 600 includes a fourth backing plate 620 and a plurality of second support plates 610. The plurality of second support plates 610 are sequentially and spacedly connected to the fourth backing plate 620 along the axial direction of the lower shell 822. The second support plates 610 are provided with upward support surfaces in contact with the lower shell 822. The second support plates 610 are used to be connected to the process platforms 822a of the lower shell 822 through screws along both sides of the lower shell 822 in the width direction.

[0091] Step 2: aging treatment;

[0092] Step 3: semi-finishing machining of the outer profile, the end surfaces, the inner profile and the opening of the lower shell 822.

[0093] The semi-finishing machining can be semi-finishing milling. After the semi-finishing machining, the single-side remaining cutting amount of the outer profile, the two end surfaces and the inner profile is all 0.3-0.7 mm. The single-side remaining cutting amount of the fitting surface of the opening of the semi-finishing machining is 0.3-0.7 mm.

[0094] Step 4: finishing machining of the opening and the end surfaces of the lower shell 822. The size of the depression of the opening is matched with the size of the outer shape of the upper shell 821.

[0095] The finishing step can still be implemented by clamping and fixing the lower shell clamp 600, and the mating surface at the opening can be finely milled, and the sealing groove, end face hole, etc. can also be finely milled.

[0096] The preliminary processing step of the post-measurement cabin shell includes:

[0097] Step 1: Roughly processing each end face, inner profile and outer profile of the post-measurement cabin section 830

[0098] The rough processing includes a first rough processing, a first aging treatment, a second rough processing and a second aging treatment in sequence. The first rough processing is as follows: roughly milling the large end face and the small end face, processing the process pin hole and the process thread hole to one level smaller than the design drawing state, and the process pin hole and the process thread hole are used for clamping and processing the datum reference of the large end face and the small end face; the small end face is clamped with a tooling plate, the large end face faces upward, the inner profile is roughly milled to a uniform single side residual cutting amount of 4-6mm; the large end face is clamped with a tooling plate, the small end face faces upward, the tooling plate pin hole is used as a datum reference, and the outer profile is roughly milled to a single side residual cutting amount of 4-6mm. The first aging treatment can be natural aging or artificial aging, and when natural aging is selected for the aging treatment, the time is more than 48h, the stress is released, and the deformation amount is detected. The second rough processing is as follows: the large end face, the small end face, the inner profile and the outer profile are roughly milled to a single side residual cutting amount of 1-3mm. The second aging treatment can be natural aging, and the time is more than 48h.

[0099] Step 2: Semi-finish processing each end face, inner profile and outer profile of the post-measurement cabin section 830 to a single side residual cutting amount of 0.3-0.8mm;

[0100] Step 3: Finishing each end face and inner profile of the post-measurement cabin section 830 to the design size.

[0101] Specifically, the large end face, the small end face, the end face mounting hole and the sealing groove are finely milled to the design size, and the inner profile is finely milled to ensure the shape and position tolerance size of the inner profile and each hole system and hatch.

[0102] S2, pre-assemble three said processing shells to obtain a combined shell;

[0103] The three processing shells are pre-assembled to facilitate subsequent finishing of the outer profile size of the combined shell to a set value, and the pre-assembly can be implemented by using a pre-assembly tool 700 or some tooling, and the specific structure is not limited in the application.

[0104] In some embodiments, the three said processing shells are pre-assembled by using the pre-assembly tool 700, please refer to Figure 12, the preloading tool 700 comprises a mounting structure and an end fixing plate 750, the mounting structure is provided with a plurality of fixing positions for fixing the combined shell and arranged along the axial direction of the combined shell in sequence, so as to fix the combined shell and ensure that the three processing shells are coaxial and the relative positions are fixed; the end fixing plate 750 is located on one side of the plurality of fixing positions and is detachably connected to the mounting structure, and the side surface of the end fixing plate 750 is used for abutting against the end surface of the combined shell; the hoisting adopts the process table 822a for measuring the lower shell 822 of the front cabin and the end fixing plate 750 for measuring the large end surface of the rear cabin shell.

[0105] In some embodiments, the combined cabin section 800 is provided with a relative tip and a large end, and the radial dimension of the combined cabin section 800 increases in sequence from the tip to the large end, that is, the tip 810 is provided with the tip, the measuring rear cabin shell is provided with the large end, the mounting structure comprises a base plate 710 and a support 720, and the base plate 710 is connected to the end fixing plate 750; the support 720 is provided with a plurality of support surfaces which are shaped according to the outer shape of the combined shell, and the plurality of supports 720 are connected to the base plate 710 in sequence along the axial direction of the combined cabin section 800; the support 720 is provided with a support surface for acting with the combined shell, and the support 720 is connected with a fixing member for fixing the combined shell, and the plurality of fixing members form the fixing position with the support 720. Please continue to combine Figure 12 The support 720 is a support plate, and the support plate is provided with four support surfaces which are shaped according to the outer shape of the combined shell, and the support plate is connected and fixed to the base plate 710, for example, by pin positioning and screw connection and fixing, and the support surfaces, that is, the upper surfaces, are machined in unison to be shaped according to the outer shape of the combined shell.

[0106] In some embodiments, please continue to combine Figure 12 The fixing member connected to the support 720 of the middle part is two threaded fasteners 730 connected to the process tables 822a on the two sides of the combined shell in the width direction, and the thickness center lines of the process tables 822a on the two sides of the combined shell in the width direction are coplanar with the symmetry plane of the combined shell, that is, the process tables 822a on the two sides of the lower shell 822 of the measuring front cabin section 820 are respectively connected to the support plates on the two sides of the lower shell 822 in the width direction through threaded members, for example, screws, and a plurality of support plates can be arranged below the lower shell 822 of the measuring front cabin section 820, and the number of support plates is the same as the number of process tables 822a of the lower shell 822.

[0107] In some embodiments, please continue to combine Figure 12The fixed part of the support 720 connected below the tip is a pressing strip 740 for pressing against the tip, that is, the support 720 and the two ends of the pressing strip 740 are connected below the end head 810, so that the support 720 and the pressing strip 740 enclose an opening for the end head 810 to pass through, and the pressing head can be a profiled pressing strip 740; the end head 810 has removed the process platform 810a in the preliminary processing step, and the measuring rear cabin section 830 has also removed the process platform in the preliminary processing step, so that the pre-assembly tooling 700 uses the end fixed plate 750, the pressing strip 740 and the support 720 to cooperate to fix the two axial ends of the combined shell, and the processing shell of the measuring front cabin section 820 in the middle with a relatively long axial length retains the process platform 822a in the preliminary processing stage and cooperates with the support plate of the pre-assembly tooling 700 to realize the pre-assembly tooling 700 of the combined shell, and the combined shell after the pre-assembly tooling 700 is easier to adjust the end head 810 and the measuring front cabin section 820, thereby ensuring the coaxiality of the three processing shells.

[0108] In some embodiments, please continue to combine Figure 12 The base plate 710 is provided with a limiting groove 711 in which the end fixed plate 750 is embedded, and the limiting groove 711 can position the end fixed plate 750 in the axial position of the combined shell.

[0109] In some embodiments, please continue to combine Figure 12 The pre-assembly tooling 700 further includes a plurality of pressing plates 760 connected to the base plate 710, the end plate fixed plate 750 is provided with a pressing hole 751 which can communicate with the inner cavity of the measuring rear cabin section 830, the pressing plate 760 is pressed against the hole wall of the pressing hole 751, and the pressing plate 760 is located on one side of the limiting groove 711; the pressing plate 760 can be provided with two, and the two pressing plates 760 are pressed against the hole wall of the pressing hole 751.

[0110] After the three processing shells of the pre-assembly tooling 700, the combined shell can be hoisted and machined on a lathe, and then the outer shape size and the remaining cutting amount of the three processing shells are detected online.

[0111] S3, finish machining the combined shell to the design size to obtain a combined cabin section 800.

[0112] The finish machining is divided into two parts, that is, the outer shape surface of the combined shell is finish machined, and then the process platform 822a on the lower shell 822 of the measuring front cabin section 820 is removed. The process platform 822a is located on both sides of the lower shell 822 in the width direction, the connecting line of the two process platforms 822a of each group of process platforms 822a intersects the central axis of the lower shell 822, and the process platform 822a of the lower shell 822 is processed and removed individually, and the screw of the process platform 822a is loosened before each process platform 822a is processed.

[0113] Then the profile size of the combined shell is measured online, and a measurement is taken every 100mm along the axis of the combined cabin section 800. After the online measurement, the combined shell is flipped and clamped again, and the edges of the profile are protected without removing burrs,

[0114] In some embodiments, please refer to Figure 11 In some embodiments, the mounting block 823 of the front cabin section 820 is provided with a plurality of through grooves 823a arranged at intervals. The gap between adjacent through grooves 823a on the mounting block 823 is very small, and the length reaches 300mm. The mounting block 823 with through grooves 823a can be processed by wire cutting, femtosecond laser processing, and 3D printing forming. The taper of the mounting block 823 processed by femtosecond laser is obvious, and the geometric size cannot reach the processing accuracy of the groove. Due to the depth, the bottom slag cannot be completely blown out, and a layer of slag will be formed at the bottom of the groove. The slag can be removed by cleaning in the later stage, but the appearance quality is poor. The surface quality of the mounting block 823 processed by 3D printing is poor, and the roughness is greater than Ra6.3. In some embodiments, the mounting block 823 is processed by wire cutting to form the through groove 823a. The wire used for wire cutting is molybdenum wire. The tensile strength of molybdenum wire is higher than that of copper wire, and it is not easy to break. Higher tensile strength ensures straighter cutting, which can better resist lateral force and bend less during processing. On the contrary, copper wire is more prone to bending. When processing a micro groove structure with a longer height, the quality of the slow wire cutting product is better near the two ends in the height direction, and the groove width size meets the requirements. However, the closer to the middle, the more serious the discharge due to bending, the groove width size becomes larger, and the groove distance size becomes smaller, which does not meet the design index. Through processing comparison and test results, it can be known that the micro groove size of the fast wire cutting product meets the requirements and the quality is stable, which can meet the design and use requirements.

[0115] The groove wall of the mounting block 823 is seriously oxidized after being processed by wire cutting. Kerosene can be used for cleaning and soaking, ultrasonic cleaning, and laser cleaning. In some embodiments, the combination scheme of ultrasonic cleaning + liquid sand blasting + ultrasonic cleaning is preferred. The combination scheme ensures the size of the product under the premise of removing the oxidation layer on the groove surface and inside the groove body, optimizes the apparent quality, and further removes the fine sand particles stuck in the groove body by using ultrasonic cleaning, so as to effectively remove the excess material. The combination scheme of ultrasonic cleaning + liquid sand blasting + ultrasonic cleaning achieves good surface cleaning effect and effectively improves the apparent quality of the product.

[0116] The processing of the mounting block 823 should be completed before the processing of the upper shell 821 of the front cabin section 820, so as to ensure that the sagging size of the upper shell 821 matches the mounting block 823.

[0117] The processing method of the large thin-walled special-shaped cabin section will be described in detail below in combination with specific embodiments.

[0118] The processing method of the combined cabin section 800 provided by the embodiment is used for processing the combined cabin section 800, the combined cabin section 800 is a large thin-walled special-shaped cabin section, the material of the combined cabin section 800 is 20Cr13, the axial length of the combined cabin section 800 is 2968 mm, the maximum size of the cross section of the combined cabin section 800 is 605 mm*470 mm, the combined cabin section 800 comprises an end head 810, a front measurement cabin section 820 and a rear measurement cabin section 830 which are sequentially connected, the length of the front measurement cabin section 820 is 1568 mm, the axial length of the end head 810 is 600 mm, the axial length of the rear measurement cabin section 830 is 800 mm, and the processing method comprises the following steps.

[0119] (1) preliminary processing of the end head 810, the front measurement cabin section 820 and the rear measurement cabin section 830

[0120] The five stainless steel forgings are a blank of the end head 810, an upper shell 821 of the front measurement cabin section 820, a lower shell 822 of the front measurement cabin section 820, a mounting block 823 and a blank of the rear measurement cabin section 830, the five stainless steel forgings are solid solution treated first, and then are subjected to preliminary processing respectively. Wherein:

[0121] 1.1 the preliminary processing steps of the end head 810 are as follows: rough machining of six surfaces, each surface is left with a 5 mm allowance. Rough machining of one side of the outer shape surface and one side of the thickness direction of the process platform 810a, and processing of a process hole on the process platform 810a; then turning over, rough machining of the other side of the outer shape surface and the other side of the thickness direction of the process platform 810a, after the above-mentioned two surface rough machining, the outer shape surface is machined to be left with an allowance of 5 mm, the four process platforms 810a are machined to target sizes, and the overall size of the process platform 810a is 50*40*30 mm. The process platform 810a is clamped and fixed by using the first supporting clamp 200, the weight-reducing groove is rough milled with a single side allowance of 2 mm; the first supporting clamp 200 is released from the fixing, the process platform 810a is used as the clamping reference and the taking reference after turning over, the process platform 810a is clamped and fixed by using the first supporting clamp 200 to rough mill the weight-reducing groove with a single side allowance of 2 mm. Natural aging is performed for 50 h, and the environment temperature is balanced. The process platform 810a is clamped and fixed by using the first supporting clamp 200, the outer shape surface and the large end surface of the end head 810 are semi-finely milled with a single side allowance of 0.5 mm; then the weight-reducing groove, the large end surface and the end surface hole are finely milled to the design size. The shell is clamped and fixed by using the second supporting clamp 300, the pin hole in the end surface hole is used for positioning, the thread hole in the end surface hole is used for fixing, then the process platform 810a is milled by using the five-axis machining center to remove the four process platforms 810a.

[0122] 1.2 the processing steps of the mounting block 823 are as follows: the structure of the through groove 823a of the mounting block 823 is processed by using wire cutting. The metal wire used for wire cutting is molybdenum wire, after the processing is completed, ultrasonic cleaning is performed, then liquid sand blasting is performed, and finally ultrasonic cleaning is performed again, so as to obtain the mounting block 823 with good apparent quality.

[0123] 1.3 The preliminary processing steps of the upper shell 821 of the measurement cabin are as follows: rough milling of the inner and outer surfaces of the upper shell 821 with a single side allowance of 5 mm. Rough processing of 6 process tables 821a with dimensions of 50*40*30 mm to ensure that the process tables 821a are symmetrically divided vertically, and process holes are drilled on the process tables 821a. Natural aging for 28 h. Using the first upper shell clamp 400 to clamp and fix the shell, an upper gantry five-axis machining center is used to twice rough mill the inner and outer surfaces of the upper shell 821 with a single side allowance of 2 mm. Natural aging for 28 h to balance with the ambient temperature, and the size and deformation are detected. Using the first upper shell clamp 400 to clamp and fix the shell, semi-fine milling of the inner and outer surfaces and side surfaces (periphery) of the upper shell 821 with a single side allowance of 0.5 mm. Using the second upper shell clamp 500 to clamp and fix the shell, except for the 6 process tables 821a, fine milling of the side surfaces, assembly surfaces, inner type depressions (mounting holes of the mounting block 823), sensor mounting holes, thermocouple mounting holes, 11 depressions of the mounting block 823 for machining micro grooves, sealing grooves and screw holes, etc. The size of the inner type depression is machined according to the measured value of the outer shape size of the mounting block 823 to meet the assembly clearance requirement of 0.05 mm, and the mounting block 823 is installed in the inner type depression after the inner type depression size is machined.

[0124] 1.4 The processing procedure steps of the lower shell 822 of the measurement cabin are as follows: rough milling of the six surfaces of the shell with a single side allowance of 5 mm; rough milling of the concave surface, inner surface (including the reverse blocking surface), outer surface, inner side surface of the large end surface, inner side surface of the small end surface, and end frame, all with a single side allowance of 5 mm; rough processing of 4 process tables 822a with dimensions of 60*50*50 mm, and process holes are drilled on each process table 822a. Turn over the shell, use the lower shell clamp 600 to clamp and fix the shell, rough mill the back outer type with a single side allowance of 5 mm, process 4 flat surfaces on the back of the process table 822a to ensure that the process table 822a is symmetrically divided vertically, and process holes are drilled on the process table 822a. Natural aging for 26 h to release stress and detect deformation. Continue to use the lower shell clamp 600 to clamp and fix the shell, and twice rough process the concave surface, back surface, end surface and outer surface of the shell, all with a single side allowance of 2 mm. Natural aging for 26 h to detect the size and deformation. Using the lower shell clamp 600 to clamp and fix the shell, semi-fine milling of the outer surface, large end surface, small end surface, inner surface and abutting surface, all with a single side allowance of 0.5 mm. Using the lower shell clamp 600 to clamp and fix the shell, fine milling of the abutting surface, sealing groove, screw hole, large end surface, small end surface, end surface hole and sealing groove; the size of the depression is machined according to the measured value of the outer shape size of the upper shell 821 of the measurement cabin to meet the assembly clearance requirement of 0.05 mm.

[0125] 1.5 The post-measurement cabin shell machining process steps are: rough milling the large end face and small end face of the post-measurement cabin shell, and processing process pin holes and process thread holes (the size is one level smaller than the design drawing state) on the large end face and small end face, which are used for clamping and processing the large end face and small end face and the datum for taking measurements. The small end is clamped with a tooling plate, the large end faces up, the inner profile of the post-measurement cabin shell is rough milled, and all dimensions are left with a single-sided allowance of 5 mm. The large end is clamped with a tooling plate, the small end faces up, the tooling plate pin hole is used as the datum for taking measurements, the outer profile of the post-measurement cabin shell is rough milled, and a single-sided allowance of 5 mm is left. Naturally age for 50 h to release stress and detect deformation. The large end face, small end face, inner profile and outer profile are rough milled again, all with a single-sided allowance of 2 mm. Naturally age for 28 h to detect dimensions and deformation. The large end face, small end face, inner profile and outer profile of the post-measurement cabin shell are semi-finished milled, all with a single-sided allowance of 0.5 mm. The large end face, small end face and end face mounting hole, sealing groove of the post-measurement cabin shell are finished milled to size; the inner profile of the post-measurement cabin shell is finished milled: to ensure the shape and position tolerance dimensions of each profile, each hole system, hatch, etc.

[0126] (2) Offline pre-assembly tooling 700 steps

[0127] The pre-assembly tooling 700 is used to add steps 1 initial processing to form three processing shells, namely the end head 810 shell, the pre-measurement cabin section 820 shell and the post-measurement cabin section 830 shell, which are processed on the lathe through the process platform 822a of the pre-measurement cabin lower shell 822 and the end fixing plate 750 of the large end of the post-measurement cabin shell, and then the outer profile dimensions of each cabin section after assembly are checked online, and the processing allowance of the outer profile is checked.

[0128] (3) Finish milling each outer profile of the upper part of each cabin section of the combined shell to the design size. When finish milling the outer profile, first rough mill to leave a single-sided allowance of 0.15 mm, and then finish to the design size. When finish milling the outer profile, the top surface of the process platform 822a of the lower shell 822 of the pre-measurement cabin is milled to see the light in turn, the top surfaces of multiple process platforms 822a are coplanar, the top surface is used as the positioning surface, and the distance from the positioning surface to the center plane of the combined shell is recorded to provide a basis for step 4 reference conversion. When milling the process platform 822a, the clamping screw is loosened, and after the top surface milling is completed, the clamping screw is tightened with the process platform 822a. During processing, the tool path is processed in sections, and the tool path is encrypted to ensure that the finish surface roughness reaches Ra0.8, which facilitates mirror polishing and avoids the tool passing around the corners of the shell and rounding the corners. After the outer profile and the positioning surface are processed, take points in sections with an interval of 100 mm to record the contour dimensions.

[0129] (4) Turn over the combined shell after step 3 processing, and use the preloading tool 700 for secondary clamping, pay attention to protect the edges with rags, do not remove burrs easily, use the positioning surface after step 3 processing as the processing reference, and precisely mill each external surface of each cabin section of the combined shell to the design size, the processing steps of the external surface are the same as step (3), after the external surface processing is completed, take points sectionally, and record each contour size at intervals of 100 mm.

[0130] (5) Remove all process tables 822a of the lower shell 822 of the measurement front cabin section 820 of the combined shell.

[0131] (6) Surface polishing: protect with foam and rags, respectively, and perform rough polishing, semi-precision polishing and precision polishing processes of each surface, so that the product meets the Ra0.4 mirror surface requirement.

[0132] (7) Rust prevention treatment: spray rust-proof oil on the surface of the workpiece to prevent oxidation and rusting.

[0133] (8) Product packaging: first wrap with insurance film, then wrap with bubble film, and finally hang with cloth sling into a special turnover wooden box.

[0134] The processing method provided by the application has at least the following advantages:

[0135] (1) Each cabin section of the combined cabin section 800 is initially processed separately and has a remaining cutting amount of the external surface, and then the three processed shells are pre-assembled for precision processing of the external surface, so that the consistency of the shape of the combined cabin section 800 is ensured, there is no step, and the apparent quality is good.

[0136] (2) In the initial processing of each cabin section, the process table 822a, which is coplanar with the symmetry plane passing through the center axis, of the lower shell 822 of the measurement front cabin section 820 with the longest axial length is processed, the process table 822a is used as a reference for pre-assembling the three initially processed processed shells, so that the assembly accuracy of the three processed shells is ensured, and the process table 822a can also be used for processing accuracy calibration and detection after pre-assembly, and the processing accuracy of the combined cabin section 800 is improved; the process table 822a can also be used for product transfer and hoisting, improving the convenience.

[0137] (4) The upper surface and the lower surface of the process table 822a processed on the lower shell 822 are used as process references to realize rough and precision processing of the lower shell 822 parts;

[0138] (3) The profiled backing plate of the second upper shell 821 and the profiled supporting surface of the preloading tool 700 support plate are attached to the shell shape, which enhances the overall rigidity of the parts, reduces deformation, and ensures the assembly gap requirement and the internal surface profile requirement of the measurement front cabin lower shell 822.

[0139] (4) The pre-assembly tool 700 is provided with a plurality of support plates, the support surface of the support plate is conformal with the shape of the combined shell, the end fixing plate 750 is positioned through the limiting groove 711 of the base plate 710, and is combined with the pressing plate 760 to axially limit the combined shell. After offline fixing, the large end of the combined shell is used as a reference, the lower shell 822 process table 822a of the front cabin section 820 is used for composite table finding to ensure the overall rigidity of the combined shell and improve the clamping and finding efficiency.

[0140] Although preferred embodiments of the application have been described, those of ordinary skill in the art can make additional changes and modifications to these embodiments once they have been informed of the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the application.

[0141] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A method of processing a combination pod for processing a combination pod having a nosepiece, a pre-measurement pod and a post-measurement pod connected in sequence, the nosepiece being provided with a tip, characterized in that, The processing method comprises: respectively preliminary processing three cabin section blanks, obtaining three processing shells; the measurement front cabin section corresponding processing shell width direction both sides have process platform; pre-assemble three processing shells, obtain the combined shell; finish machining the combined shell to the design size, obtain the combined cabin section; wherein, using pre-assembly tooling to assemble three processing shells, the pre-assembly tooling comprises: mounting structure, including base plate and a plurality of support, a plurality of support along the axial direction of the combined cabin section is connected to the base plate in turn, the support is provided with the support surface for matching the outer shape surface of the combined shell, the support is connected with the fixed part for fixing the combined shell, a plurality of fixed parts and the support form a plurality of fixed position, the fixed part connected to the support in the middle is two threaded fasteners connected to the process platform respectively; the fixed part connected to the support below the end head is the pressing strip for pressing on the tip; end fixed plate, located on one side of the plurality of fixed position, and can be detachably connected to the base plate, the side surface of the end fixed plate is used for pressing on the end surface of the large end of the combined shell, the base plate is provided with the limit groove embedded with the end fixed plate, and the side surface of the end fixed plate is used for pressing the end surface of the combined shell.

2. The method of processing a combination cabin section of claim 1, wherein, After the preliminary processing, the outer shape surface of the three processing shells has a remaining cutting amount of 0.4-0.6mm respectively, and the inner shape surface of the three processing shells is of the design size.

3. The method of processing a combination cabin section of claim 1, wherein, The thickness center line of the process platform is coplanar with the symmetry plane of the combined shell over the center axis.

4. The method of processing a combination cabin section according to any one of claims 1-3, characterized in that, The axial length of the measurement front cabin section is greater than or equal to 1000mm, and the measurement front cabin section and the measurement rear cabin section are both provided with through inner cavities, and the two inner cavities are connected in sequence.

5. The method of processing a combination cabin section of claim 4, wherein, The measurement front cabin section comprises a lower shell with an opening on the peripheral surface and an upper shell connected to the opening, and the upper shell is provided with a plurality of mounting holes, the preliminary processing steps of the upper shell comprise: rough machining the outer surface and the inner surface of the upper shell; aging treatment; semi-finish machining the outer surface, the inner surface and the side surface of the upper shell; finish machining the side surface, each mounting hole and the assembly surface with the lower shell, and the sinking size of the mounting hole is matched with each mounting structure; the preliminary processing steps of the lower shell comprise: rough machining the inner shape surface, the outer shape surface, each end surface, the end frame and the opening of the lower shell; aging treatment; semi-finish machining the outer shape surface, each end surface, the inner shape surface and the opening of the lower shell; finish machining the opening and each end surface of the lower shell, and the sinking size of the opening is matched with the outer size of the upper shell.

6. The method of processing a combination cabin section of claim 4, wherein, the preliminary processing steps of the end head comprise: rough machining the outer shape surface and the weight reduction groove of the end head; semi-finish machining the outer shape surface and the large end surface of the end head to a single side remaining cutting amount of 0.4-0.6mm; finish machining the weight reduction groove and the large end surface to the design size; the preliminary processing steps of the measurement rear cabin section comprise: rough machining each end surface, the inner shape surface and the outer shape surface of the measurement rear cabin section; semi-finish machining each end surface, the inner shape surface and the outer shape surface of the measurement rear cabin section to a single side remaining cutting amount of 0.3-0.8mm; finish machining each end surface and the inner shape surface of the measurement rear cabin section to the design size.

7. The method of processing a combination cabin section of claim 5, wherein, The mounting structure of the pre-measurement cabin section is a mounting block provided with a plurality of through grooves, and the mounting hole is processed through the through groove structure by wire cutting, and the cutting wire is a molybdenum wire.

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