A method for preparing a large thin-walled cylinder

Abstract

The present invention relates to a preparation method of a large thin-walled cylinder, which belongs to the technical field of large cylinder processing, and solves the problems of easy deformation of large-sized thin-walled parts and uneven wall thickness of thin-walled deep grooves in the prior art processing. The method comprises: step 1: processing multiple cylinder segment shells to obtain multiple cylinder segment shells with "U"-shaped deep grooves; step 2: welding multiple cylinder segment shells into shape to obtain a cylinder; wherein, in step 1, the cylinder segment shell is processed with the inner circular end surface of the cylinder segment shell as the reference surface; wherein, the "U"-shaped groove is processed by the rough machining-semi-finishing-finishing machining method; in the semi-finishing and finishing processes, a processing area segment with a length of 20-40 mm is used as a single processing unit. High-precision processing of the U-shaped deep groove of the thin-walled cylinder segment shell is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of large cylinder processing, and in particular to a method for preparing a large thin-wall cylinder. Background Art

[0002] A super-large cylinder is one of the important components of a spacecraft. It is equipped with supporting parts inside. There is a "U"-shaped deep groove axially distributed on the outer end surface of the cylinder. The "U"-shaped deep groove is the same length as the cylinder. The inner cavity of the cylinder needs to ensure that the supporting parts can enter and exit smoothly without jamming. At the same time, the "U"-shaped deep groove needs to have a uniform wall thickness to ensure that the supporting parts located in the cylinder can flush the "U"-shaped deep groove in an environment with fluid resistance, so that the supporting parts can enter and exit the cylinder smoothly without jamming.

[0003] At present, the inner circle of the shell is generally supported by the three-jaw chuck of the machine tool to carry out the inner and outer circle processing of the shell; when processing the U-shaped deep groove, layered processing is adopted, and each layer is processed by a fixed feed amount.

[0004] However, due to the limited contact area between the three jaws and the parts, they cannot provide a good supporting and fixing effect, which makes it difficult to ensure the corresponding geometric tolerances of thin-walled parts during internal and external circle processing, which is not conducive to subsequent processes; and the U-shaped deep groove has thin walls and a large span. Due to the lack of sufficient supporting force, it is very easy to cause deformation of the parts during cutting, which ultimately leads to extremely uneven wall thickness of the U-shaped deep groove, seriously affecting subsequent use. Summary of the invention

[0005] In view of the above analysis, an embodiment of the present invention aims to provide a method for preparing a large thin-walled cylinder, so as to solve the problems of easy deformation of large-sized thin-walled parts and uneven wall thickness of thin-walled deep grooves in the prior art processing.

[0006] On the one hand, an embodiment of the present invention provides a method for preparing a large thin-walled cylinder, comprising:

[0007] Step 1: Processing a plurality of barrel segment shells to obtain a plurality of barrel segment shells with “U”-shaped deep grooves;

[0008] Step 2: Welding multiple cylinder segment shells to obtain a cylinder body;

[0009] Wherein, in step 1, the inner circular end surface of the barrel section shell is used as a reference surface to process the barrel section shell;

[0010] Among them, the “U”-shaped groove is processed by rough machining-semi-finishing-finishing processing method;

[0011] During semi-finishing and finishing, a processing area segment of 20-40 mm in length is used as a single processing unit.

[0012] Furthermore, the step 1 comprises:

[0013] S1: Pre-process the outer end surface of the barrel shell to adjust the coaxiality and straightness of the inner and outer circular end surfaces of the barrel shell;

[0014] S2: Align the barrel shell and determine the processing position of the "U"-shaped deep groove on the barrel shell;

[0015] S3: Based on the processing position of the "U"-shaped deep groove, the inner cavity of the barrel shell is pre-processed;

[0016] S4: Process a "U"-shaped deep groove on the outer end surface of the cylinder shell.

[0017] Furthermore, the step 2 comprises:

[0018] S5: placing multiple barrel segment shells on a welding platform and adjusting the coaxiality of the multiple barrel segment shells;

[0019] S6: welding a plurality of barrel segment shells into shape;

[0020] S7: Process the excess at both ends of each cylinder segment shell so that the sunken grooves and "U"-shaped deep grooves of adjacent cylinder segment shells are connected to obtain a finished cylinder body.

[0021] Further, the S1 includes:

[0022] S101: clamping the barrel segment shell by using auxiliary tooling, and installing the barrel segment shell on a horizontal lathe;

[0023] S102: Taking the inner circular end surface of one end of the barrel shell as a reference surface, the straightness and the axis centerline position of the outer end surface of the barrel shell are adjusted.

[0024] Further, the S4 includes:

[0025] S401: Clamp the barrel segment shell by using auxiliary tooling, and install the barrel segment shell on a horizontal lathe;

[0026] S402: Based on the position of the “U”-shaped deep groove to be processed, a sunken groove is processed on the barrel shell by a rough processing-semi-finishing-finishing method;

[0027] S403: Based on the determined “U”-shaped deep groove to be processed position, the “U”-shaped deep groove is processed in the sunken groove by adopting a rough processing-semi-finishing-finishing method.

[0028] Furthermore, the auxiliary tooling includes a chuck, a cover plate and multiple pull rods. When clamping, the chuck and the cover plate are placed at both ends of the barrel section shell, and the two ends of the pull rod are respectively connected to the chuck and the cover plate to tighten the chuck and the cover plate at the two end openings of the barrel section shell.

[0029] Furthermore, the chuck and the cover plate are provided with coaxial steps. When clamping, the coaxial steps on the chuck and the cover plate are respectively inserted into the openings at both ends of the barrel section shell to support the end openings of the barrel section shell.

[0030] Furthermore, the chuck and the cover plate are provided with a plurality of groups of mounting holes correspondingly, so as to adjust the mounting position of the pull rod through the mounting holes;

[0031] During installation, two ends of the pull rod are respectively inserted into a group of installation holes.

[0032] Furthermore, it also includes a supporting member, the supporting member includes a fixing portion and a supporting portion, the fixing portion is used to be sleeved on the pull rod and slidably connected with the pull rod; wherein the supporting portion is arranged on the fixing portion;

[0033] Among them, S3 includes milling the internal annular ribs of the barrel section shell to obtain a barrel section shell with a notch in the internal annular ribs, and the support part is a conformal structure at the notch of the annular rib, which is used to be inserted into the notch of the annular rib and fit on the inner wall of the barrel section shell.

[0034] Furthermore, in the semi-finishing process, a processing area segment of 20-40 mm in length is used as a single processing unit, and the cutting amount of the semi-finishing is adjusted based on the cutting deviation during roughing, and the difference compensation of the roughing is performed;

[0035] During the finishing process, the processing area segment with a length of 20-40 mm is used as a single processing unit. The cutting amount of the finishing is adjusted based on the cutting deviation during semi-finishing, and the difference compensation is performed on the semi-finishing.

[0036] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0037] 1. The present invention first processes each cylinder segment shell separately, and then combines several cylinder segment shells into a shape by welding. When processing the cylinder segment shell, the cylinder segment shell is processed with the inner circular end surface reference plane of the cylinder segment shell to avoid deviation caused by the inner circular end of the cylinder segment shell and the inability to place the matching parts, so that the matching parts can enter and exit the cylinder without jamming.

[0038] 2. The sunken groove and "U"-shaped deep groove are processed by the rough machining-semi-finishing-finishing processing method. In the semi-finishing process, a processing area segment with a length of 20-40 mm is used as a single processing unit. Before processing a processing area segment, the wall thickness of the area segment is first detected by a wall thickness gauge to determine the cutting deviation during rough machining. The cutting amount of semi-finishing is adjusted based on the cutting deviation during rough machining to compensate for the difference in rough machining; and in the finishing process, a processing area segment with a length of 20-40 mm is used as a single processing unit. Before processing a processing area segment, the wall thickness of the area segment is first detected by a wall thickness gauge to determine the cutting deviation during semi-finishing. The cutting amount of finishing is adjusted based on the cutting deviation during semi-finishing to compensate for the difference in semi-finishing, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell during rough machining and semi-finishing.

[0039] 3. Pre-process the outer end surface of the barrel shell to adjust the coaxiality and straightness of the inner and outer circular end surfaces of the barrel shell to adjust the uniformity of the wall thickness of the barrel shell, thereby ensuring the uniformity of the wall thickness of the "U"-shaped deep groove processed later, thereby avoiding the inability of the supporting parts to smoothly punch open the barrel due to uneven thickness of the "U"-shaped deep groove.

[0040] 4. Fit the two ends of the barrel shell onto the coaxial steps of the cover plate and the chuck respectively, so as to round the end of the barrel shell through the coaxial steps to avoid its deformation, and abut against the annular ribs inside the barrel shell through the pull rod to support the annular ribs, thereby supporting the inner wall of the barrel shell, further reducing the risk of deformation of the barrel shell.

[0041] 5. The inner circle end face reference of the barrel section shell is transferred to the cover plate, which overcomes the problem that the inner circle reference of the barrel section shell is difficult to align; in addition, the inner circle end of the barrel section shell is used for push-type placement of supporting parts, and the inner circle end of the barrel section shell is used as the alignment reference surface to avoid deviation caused by the inner circle end of the barrel section shell and the inability to place supporting parts, so that the supporting parts can enter and exit the barrel section shell without jamming.

[0042] 6. A top support piece on a pull rod is filled in the rib gap and fitted on the inner wall of the cylinder shell to support the position of the "U"-shaped deep groove to be processed, further reducing the risk of deformation at the processing position of the "U"-shaped deep groove on the cylinder shell.

[0043] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0045] Figure 1 It is a flow chart of the U-shaped deep groove processing method of the thin-walled cylinder section shell in the present invention;

[0046] Figure 2 It is a schematic diagram of the structure after the annular rib notch inside the shell of the cylinder section of the present invention is processed;

[0047] Figure 3 for Figure 2 Schematic diagram of the cross section at AA;

[0048] Figure 4 It is a schematic diagram of the structure of the auxiliary tooling in the present invention when assembling the housing of the clamping cylinder section;

[0049] Figure 5 It is a schematic diagram of the structure of the sunken groove and the "U"-shaped deep groove in the present invention;

[0050] Figure 6 It is a schematic diagram of the structure of the top holding member in the present invention;

[0051] Figure 7 for Figure 6 Schematic diagram of the cross section at BB;

[0052] Figure 8 It is a schematic diagram of the structure of the chuck and the cover plate in the present invention;

[0053] Fig. 9 It is a three-dimensional schematic diagram of the auxiliary tooling in the present invention when assembling the barrel segment shell;

[0054] Fig.10 It is a schematic diagram of the structure in which multiple cylinder segment shells are combined into a cylinder body in the present invention.

[0055] Reference numerals:

[0056] 1-barrel shell; 101-"U"-shaped deep groove; 102-sunken groove; 103-annular rib; 104-annular rib notch; 2-chuck; 3-cover plate; 4-pull rod; 5-limiting plate; 6-top holding piece; 601-fixing part; 602-supporting part; 8-axial direction of barrel shell; 9-horizontal plane reference line; 10-symmetric plane reference line; L-wall thickness of barrel shell; M-sunken groove depth; E-"U"-shaped deep groove thickness; a, b, c, d, e, f-points that need to be processed after the barrel shell is welded and formed. DETAILED DESCRIPTION

[0057] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0058] A super-large cylinder is one of the important components of a spacecraft. It is 5-6 meters long and has a "U"-shaped deep groove axially distributed on the outer end of the cylinder. The "U"-shaped deep groove is the same length as the cylinder. The inner cavity of the cylinder needs to ensure that the matching parts can enter and exit smoothly without jamming. At the same time, the outer circle "U"-shaped deep groove needs to have a uniform wall thickness to ensure that parts can be assembled and cut and separated in flight.

[0059] The inner and outer wall thicknesses of the barrel blank are uneven, and a plurality of annular ribs are provided on the inner wall to improve the strength of the barrel. Generally, each barrel segment shell is processed separately, and then several barrel segment shells are combined and formed by welding to obtain a finished barrel.

[0060] The cylinder has very high precision requirements, otherwise the matching parts cannot break through the cylinder and cannot achieve their corresponding functions. For any cylinder shell, its shell wall thickness is thin, rigidity is weak, and the "U" deep groove has a large span (1172mm), a thin groove wall thickness (0.75mm), and a large processing range. When processing the "U" deep groove, the cylinder shell is easy to deform, affecting the wall thickness accuracy of the "U" deep groove, and then affecting the wall thickness accuracy of the "U" deep groove of the finished cylinder, so that the matching parts cannot enter and exit the cylinder smoothly and without jamming.

[0061] In order to solve the above problems, the present invention provides a method for preparing a large thin-walled cylinder, comprising:

[0062] Step 1: Processing a plurality of barrel segment shells 1 to obtain a plurality of barrel segment shells 1 having “U”-shaped deep grooves 101;

[0063] Step 2: welding a plurality of cylinder segment shells 1 to obtain a cylinder body;

[0064] Wherein, in step 1, the inner circular end surface of the barrel section shell 1 is used as a reference surface to process the barrel section shell 1;

[0065] The “U”-shaped groove 101 is processed by a rough machining-semi-finishing-finishing machining method;

[0066] During semi-finishing and finishing, a processing area segment of 20-40 mm in length is used as a single processing unit.

[0067] Among them, all processing units constitute a complete "U"-shaped deep groove 101 processing area.

[0068] Compared with the prior art, the present invention first processes each barrel segment shell 1 separately, and then combines several barrel segment shells 1 into a shape by welding. When processing the barrel segment shell 1, the barrel segment shell is processed with the inner circular end face reference plane of the barrel segment shell 1 to avoid deviation caused by the inner circular end of the barrel segment shell 1, which leads to the inability to place matching parts, so that the matching parts can enter and exit the barrel without jamming; and, a processing area segment with a length of 20-40mm is used as a single processing unit, and a rough processing-semi-finishing-finishing processing method is adopted to process the "U"-shaped deep groove 101, which overcomes the problem of uneven cutting amount caused by deformation of the barrel segment shell 1 during rough processing and semi-finishing.

[0069] Specifically, in step 1, it includes:

[0070] S1: Pre-processing the outer end surface of the barrel shell 1 to adjust the coaxiality and straightness of the inner and outer circular end surfaces of the barrel shell 1;

[0071] S2: Align the barrel section shell 1 and determine the processing position of the "U"-shaped deep groove on the barrel section shell 1;

[0072] S3: Based on the processing position of the “U”-shaped deep groove 101, pre-processing the inner cavity of the barrel section shell 1;

[0073] S4: Processing a “U”-shaped deep groove 101 on the outer end surface of the barrel segment shell 1.

[0074] Among them, in S1, including:

[0075] S101: clamping the cylinder section shell 1 by means of supporting the two ends;

[0076] Specifically, the barrel section shell 1 is clamped by using auxiliary tooling, and the barrel section shell 1 is installed on a horizontal lathe.

[0077] Among them, Figure 2-9 As shown, the auxiliary tooling includes a chuck 2, a cover plate 3 and a plurality of pull rods 4. When clamping, the chuck 2 and the cover plate 3 are placed at both ends of the barrel section shell 1, and the two ends of the pull rod 4 are respectively connected to the chuck 2 and the cover plate 3 to tighten the chuck 2 and the cover plate 3 at the openings at both ends of the barrel section shell 1.

[0078] Specifically, one end surface of the chuck 2 is a mounting surface for mounting on a machine tool, and the other end surface thereof is a pressing surface, which is pressed against an opening at one end of the barrel section housing 1 under the tensile action of the pull rod 4 .

[0079] Furthermore, a coaxial step is provided on the clamping surface of the chuck 2, and the outer diameter of the coaxial step is 0.1-0.2 mm smaller than the inner diameter of the opening at one end of the barrel section housing 1. When clamping, the coaxial step provided on the clamping surface of the chuck 2 is inserted into the end opening of the barrel section housing 1 to support the end opening of the barrel section housing 1 to avoid deformation of the port of the barrel section housing 1.

[0080] Specifically, one end surface of the cover plate 3 is a pressing surface. When clamping, under the tensile action of the pull rod 4 , the pressing surface of the cover plate 3 is pressed against the other end opening of the barrel section housing 1 .

[0081] Furthermore, a coaxial step is provided on the pressing surface of the cover plate 3, and the outer diameter of the coaxial step is 0.1-0.2 mm smaller than the inner diameter of the opening at the other end of the barrel section shell 1. When clamping, the coaxial step provided on the pressing surface of the cover plate 3 is inserted into the end opening of the barrel section shell 1 to support the end opening of the barrel section shell 1 to avoid deformation of the end of the barrel section shell 1.

[0082] Furthermore, the outer diameters of the chuck 2 and the cover plate 3 are respectively the same as the outer diameters of the two end ports of the barrel section shell 1, and a plurality of limit plates 5 are respectively provided on the outer arc surfaces of the chuck 2 and the cover plate 3 to limit the barrel section shell 1 in the diameter direction of the barrel section shell 1 to ensure that the barrel section shell 1 does not slide to avoid affecting the processing accuracy.

[0083] Specifically, a plurality of tie rods 4 are provided, one end of the tie rod 4 is screwed to the chuck 2, and the other end of the tie rod 4 freely passes through the cover plate 3. When clamping, a nut is provided at the end of the tie rod 4 located at the cover plate 3. The nut is screwed in, and the cover plate 3 is squeezed through the nut, and then the barrel section shell 1 is squeezed through the cover plate 3, so that the barrel section shell 1 is clamped and fixed in the axial direction of the barrel section shell 1.

[0084] Furthermore, a plurality of groups of mounting holes are correspondingly provided on the chuck 2 and the cover plate 3 so as to adjust the mounting position of the pull rod 4 through the mounting holes; during installation, the two ends of the pull rod 4 are respectively inserted into a group of mounting holes, and through the cooperation of the nut and the pull rod 4, the chuck 2 and the cover plate 3 are squeezed at the two ends of the barrel section shell 1.

[0085] Furthermore, a plurality of tie rods 4 abut against the annular ribs 103 to support the annular ribs 103 , thereby supporting the inner wall of the barrel section shell 1 and reducing the risk of deformation of the barrel section shell 1 .

[0086] S102: Taking the inner circular end surface of one end of the barrel segment shell 1 as a reference surface, adjusting the straightness and axis centerline position of the outer end surface of the barrel segment shell 1;

[0087] Specifically, they include:

[0088] S1021: Determine the machining reference surface;

[0089] Specifically, the inner circular end surface at one end of the barrel section shell 1 is used as the processing reference surface, and a cover plate 3 is fastened at the end, so that when multiple barrel section shells 1 are combined into a finished barrel, the coaxiality of the multiple barrel section shells 1 is ensured to prevent the matching parts from being unable to smoothly enter and exit the barrel.

[0090] Among them, the coaxial step arranged on the pressing surface of the cover plate 3 is inserted into the opening at one end of the barrel section shell 1, and the outer diameter of the cover plate 3 is the same as the outer diameter of the barrel section shell 1 at this port. Then, the reference surface of the inner circular end of the barrel section shell 1 is transferred to the outer arc surface of the cover plate 3, so that the outer arc surface of the cover plate 3 is used as the processing reference surface.

[0091] S1022: Rough machining is performed on the outer end surface of the barrel section shell 1, with a machining allowance of 2-3 mm;

[0092] The wall thickness requirement of the barrel section shell 1 is 7.8 mm, that is, the wall thickness of the barrel section shell 1 is 9.8-10.8 mm, thereby ensuring the rigidity of the barrel section shell 1 and reducing the risk of deformation of the barrel section shell 1.

[0093] S1023: The barrel section shell 1 is finely processed by multiple passes, with each pass being less than or equal to 0.2 mm, until a barrel section shell 1 with a wall thickness of 7.8 mm is obtained.

[0094] Among them, in S2, including:

[0095] S201: Determine the horizontal and symmetric plane reference lines of the barrel shell 1;

[0096] Specifically, the barrel shell 1 is placed on a rotating table, the inner circle of the barrel shell 1 is aligned, and the horizontal plane reference line and the symmetric plane reference line of the barrel shell 1 are drawn as the basis for subsequent CNC milling and alignment of the barrel shell 1.

[0097] S202: Based on the determined horizontal plane reference line and symmetry plane reference line, determine the processing position of the “U”-shaped deep groove 101 on the barrel section shell 1.

[0098] There are two “U”-shaped deep grooves 101 on the barrel section shell 1, and the two “U”-shaped deep grooves 101 are symmetrically distributed.

[0099] Among them, S3 includes: removing the auxiliary tooling, transferring the barrel section shell 1 to the milling machine, and based on the determined processing positions of the two "U"-shaped deep grooves 101 on the barrel section shell 1, milling the annular ribs 103 at the corresponding positions on the inner cavity of the barrel section shell 1 to obtain the barrel section shell 1 with the internal annular ribs 103 having notches, so as to avoid the subsequent impact on the internal parts of the barrel body from rushing out of the barrel body.

[0100] Among them, in S4, including:

[0101] S401: Clamp the barrel section shell 1 by using auxiliary tooling, and install the barrel section shell 1 on a horizontal lathe;

[0102] Among them, the two pull rods 4 are adjusted to be placed at the two annular rib gaps 104 respectively, and a top support 6 is sleeved on the pull rods 4 to fill the rib gaps 104 and fit on the inner wall of the barrel section shell 1 to support the position of the "U"-shaped deep groove 101 to be processed, thereby further reducing the risk of deformation at the processing position of the "U"-shaped deep groove on the barrel section shell 1.

[0103] Specifically, the supporting member 6 includes a fixing portion 601 and a supporting portion 602, wherein the fixing portion 601 is sleeved on the pull rod 4 and is slidably connected with the pull rod 4; wherein the supporting portion 602 is arranged on the fixing portion 601, and is a conformal structure at the annular rib notch 104, for being inserted into the annular rib notch 104 and fitting on the inner wall of the barrel section shell 1.

[0104] During installation, one end of the four tie rods 4 is screwed onto the chuck 2. At this time, the four tie rods 4 are cross-distributed, the barrel section shell 1 is sleeved on the tie rods 4, the coaxial step of the chuck 2 is inserted into a port of the barrel section shell 1, and the barrel section shell 1 is rotated and adjusted so that the distributed annular rib notches 104 are in a horizontal position. At this time, the supporting part 6 is sleeved on the tie rods 4 corresponding to the annular rib notches 104 and pushed forward. At this time, the support part 602 slides in the annular rib notches 104.

[0105] Among them, the other two tie rods 4 avoid the notch position of the annular rib 103 and respectively abut against the annular rib 103 inside the barrel section shell 1 to support the annular rib 103, thereby supporting the inner wall of the barrel section shell 1 and further reducing the deformation risk of the barrel section shell 1.

[0106] S402: Based on the position of the U-shaped deep groove 101 to be processed, a sunken groove 102 is processed on the barrel shell 1 by a rough processing-semi-finishing-finishing method;

[0107] Specifically, they include:

[0108] S4021: rough machining the sunken groove 102 by one-step cutting;

[0109] Specifically, the cutting is performed in multiple passes in the diameter direction of the barrel segment shell 1, and each pass is performed in one go along the axial direction of the barrel segment shell 1 to improve the processing efficiency.

[0110] S4022: Based on the rough machining, semi-finishing the sunken groove 102 is performed, and difference compensation is performed on the rough machining;

[0111] Among them, in the axial direction of the barrel shell 1, a processing area segment with a length of 20-40mm is used as a single processing unit, and a wall thickness gauge is used to detect the thickness, and the difference compensation is performed on the rough processing by substituting the difference, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell 1 during rough processing.

[0112] Specifically, before processing a processing area segment, first use a wall thickness gauge to detect the wall thickness of the area segment to determine the cutting deviation during rough processing, and adjust the cutting amount of semi-finishing based on the cutting deviation during rough processing to compensate for the difference in rough processing.

[0113] Among them, based on the wall thickness value of the barrel shell 1 and the total rough machining cutting amount, the theoretical wall thickness value of the sunken groove 102 after rough machining is obtained, and the actual wall thickness value of the sunken groove 102 in the machining area is compared with the theoretical wall thickness value to obtain the cutting deviation after rough machining.

[0114] Furthermore, based on the cutting deviation after rough machining of the machining area segment, the actual total cutting amount of semi-finishing is adjusted so that the actual total cutting amount of rough machining-semi-finishing of the machining area segment is consistent with the theoretical total cutting amount.

[0115] In this way, the difference compensation of rough machining is achieved, and the problem of uneven cutting amount caused by deformation of the barrel shell 1 during rough machining is overcome.

[0116] After all the processing areas are processed, a complete semi-finished sunken groove 102 is obtained.

[0117] S4023: Based on the semi-finishing, the sunken groove 102 is finished, and the difference compensation is performed on the semi-finishing.

[0118] Among them, in the axial direction of the barrel shell 1, a processing area segment with a length of 20-40mm is used as a single processing unit, and a wall thickness gauge is used to detect the thickness, and the difference compensation is performed on the semi-finishing by substituting the difference, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell 1 during semi-finishing.

[0119] Specifically, before processing a processing area segment, first use a wall thickness gauge to detect the wall thickness of the area segment to determine the cutting deviation during semi-finishing, and adjust the cutting amount of semi-finishing based on the cutting deviation during semi-finishing to compensate for the difference in semi-finishing.

[0120] Among them, based on the wall thickness value of the barrel shell 1 and the total cutting amount of rough machining-semi-finishing, the theoretical wall thickness value of the sunken groove 102 after semi-finishing is obtained, and the actual wall thickness value of the sunken groove 102 in the processing area is compared with the theoretical wall thickness value to obtain the cutting deviation after semi-finishing.

[0121] Furthermore, based on the cutting deviation after semi-finishing of the processing area segment, the actual total cutting amount of the finishing is adjusted so that the actual total cutting amount of the roughing-semi-finishing-finishing of the processing area segment is consistent with the theoretical total cutting amount.

[0122] In this way, difference compensation for semi-finishing is achieved, and the problem of uneven cutting amount caused by deformation of the barrel shell 1 during semi-finishing is overcome.

[0123] After all the processing areas are processed, a complete and finely processed sunken groove 102 is obtained.

[0124] Exemplarily, the depression groove 102 has a depth of 2.7 (0, +0.15) mm and a width of 40 arc lengths.

[0125] In the axial direction of the barrel segment shell 1 , a margin of 15 mm is respectively provided between the two ends of the sunken groove 102 and the two ends of the barrel segment shell 1 , so as to facilitate subsequent welding connection between multiple barrel segment shells 1 .

[0126] S403: Based on the determined position of the “U”-shaped deep groove 101 to be processed, the “U”-shaped deep groove 101 is processed in the sunken groove 102 by adopting a rough processing-semi-finishing-finishing method.

[0127] Specifically, they include:

[0128] S4031: Determine the processing depth of the “U”-shaped deep groove 101;

[0129] The processing depth H of the "U"-shaped deep groove 101 satisfies:

[0130] H=LME

[0131] Wherein, L is the wall thickness of the barrel shell 1;

[0132] M is the depth of the depression 102;

[0133] E is the wall thickness of the “U”-shaped deep groove 101 .

[0134] Exemplarily, L=7.8 mm, M=2.7 mm, E=0.75 mm, then H=7.8-2.7-0.75=4.35 mm.

[0135] S4032: Rough machining of the "U"-shaped deep groove 101 by one-step cutting;

[0136] Specifically, the cutting is performed in multiple passes in the diameter direction of the barrel segment shell 1, and each pass is performed in one go along the axial direction of the barrel segment shell 1 to improve the processing efficiency.

[0137] S4033: on the basis of rough machining, semi-finishing the "U"-shaped deep groove 101 is performed, and difference compensation is performed on the rough machining;

[0138] Specifically, in the axial direction of the barrel shell 1, a processing area segment with a length of 20-40 mm is used as a single processing unit, and a wall thickness gauge is used to detect the thickness. The difference is substituted for the difference to compensate for the difference in rough processing, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell 1 during rough processing.

[0139] Before processing a processing area segment, the wall thickness of the area segment is first detected using a wall thickness gauge to determine the cutting deviation during rough processing, and the cutting amount of semi-finishing is adjusted based on the cutting deviation during rough processing to compensate for the difference in rough processing.

[0140] Among them, based on the wall thickness value of the barrel shell 1, the total cutting amount of the sunken groove 102 and the total cutting amount of rough machining, the theoretical wall thickness value of the "U"-shaped deep groove 101 after rough machining is obtained, and the actual wall thickness value of the "U"-shaped deep groove 101 in the machining area is compared with the theoretical wall thickness value to obtain the cutting deviation after rough machining.

[0141] Furthermore, based on the cutting deviation after rough machining of the processing area segment, the actual total cutting amount of semi-finishing is adjusted so that the sum of the actual total cutting amount of the sunken groove 102 of the processing area segment and the actual total cutting amount of the rough machining-semi-finishing of the "U"-shaped deep groove 101 is consistent with the theoretical sum of the total cutting amount.

[0142] In this way, the difference compensation of rough machining is achieved, and the problem of uneven cutting amount caused by deformation of the barrel shell 1 during rough machining is overcome.

[0143] After all the processing area segments are processed, a complete semi-finished "U"-shaped deep groove 101 is obtained.

[0144] S4034: Based on the semi-finishing, the “U”-shaped deep groove 101 is finished, and the difference compensation is performed on the semi-finishing.

[0145] Specifically, in the axial direction of the barrel shell 1, a processing area segment with a length of 20-40 mm is used as a single processing unit, and a wall thickness gauge is used to detect the thickness. The difference compensation is performed on the semi-finishing by substituting the difference, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell 1 during semi-finishing.

[0146] Before processing a processing area, a wall thickness gauge is first used to detect the wall thickness of the area to determine the cutting deviation during semi-finishing. The cutting amount of finishing is adjusted based on the cutting deviation during semi-finishing to compensate for the difference in semi-finishing.

[0147] Among them, based on the wall thickness value of the barrel shell 1, the total cutting amount of the sunken groove 102 and the total cutting amount of rough machining-semi-finishing, the theoretical wall thickness value of the "U"-shaped deep groove 101 after semi-finishing is obtained, and the actual wall thickness value of the "U"-shaped deep groove 101 in the machining area is compared with the theoretical wall thickness value to obtain the cutting deviation after semi-finishing.

[0148] Furthermore, based on the cutting deviation after semi-finishing of the processing area segment, the actual total cutting amount of the finishing is adjusted so that the sum of the actual total cutting amount of the sunken groove 102 of the processing area segment and the actual total cutting amount of the roughing-semi-finishing-finishing of the "U"-shaped deep groove 101 is consistent with the theoretical sum of the total cutting amount.

[0149] In this way, difference compensation for semi-finishing is achieved, and the problem of uneven cutting amount caused by deformation of the barrel shell 1 during semi-finishing is overcome.

[0150] After all the processing area segments are processed, a complete and finely processed "U"-shaped deep groove 101 is obtained.

[0151] In the axial direction of the barrel section shell 1 , a margin of 15 mm is respectively provided between the two ends of the “U”-shaped deep groove 101 and the two ends of the barrel section shell 1 , so as to facilitate subsequent welding connection between multiple barrel section shells 1 .

[0152] Exemplarily, the “U”-shaped deep groove 101 has a depth of 4.35 mm and a width of 8 arc lengths.

[0153] The “U”-shaped deep groove 101 is located in the middle of the sunken groove 102 , and the “U”-shaped deep groove 101 and the sunken groove 102 are of equal length.

[0154] In this way, by combining high feed rate roughing with low feed rate finishing, the machining efficiency can be improved while avoiding deformation of the barrel shell due to excessive feed rate.

[0155] Specifically, in step 2, it includes:

[0156] S5: placing a plurality of barrel segment shells 1 on a welding platform and adjusting the coaxiality of the plurality of barrel segment shells 1;

[0157] S6: welding a plurality of barrel segment shells 1 into shape;

[0158] S7: Process the excess at both ends of each cylinder segment shell 1 so that the sunken grooves 102 and the "U"-shaped deep grooves 101 of adjacent cylinder segment shells 1 are connected to obtain a finished cylinder.

[0159] Among them, in S7, when the recessed groove 102 is processed on the end margin of the cylinder segment shell 1, the processing method of step S402 is adopted.

[0160] Among them, after the sunken groove 102 of the excess at the end of the cylinder section shell 1 is processed, the "U"-shaped deep groove 101 is processed, and this processing method adopts step S403.

[0161] The parameters in step S403 need to be modified so that after fine machining of the “U”-shaped deep groove 101 , there is a machining allowance of 0.2-0.3 mm at the “U”-shaped deep groove 101 , thereby reducing the risk of deformation of the barrel section shell 1 .

[0162] Finally, the machining allowance is processed by manual grinding so that the "U"-shaped deep grooves 101 of all the cylinder segment shells 1 are connected, and finally a finished cylinder is obtained.

[0163] Compared with the prior art, the present invention first processes each cylinder segment shell 1 separately, and then combines several cylinder segment shells 1 into a combined shape by welding. When processing the cylinder segment shell 1, the cylinder segment shell is processed based on the inner circular end surface reference surface of the cylinder segment shell 1 to avoid deviation caused by the inner circular end of the cylinder segment shell 1, which leads to the inability to place the matching parts, and enables the matching parts to enter and exit the cylinder without jamming.

[0164] The outer end surface of the barrel section shell 1 is pre-processed to adjust the coaxiality and straightness of the inner and outer circular end surfaces of the barrel section shell 1, so as to adjust the uniformity of the wall thickness of the barrel section shell 1, thereby ensuring the uniformity of the wall thickness of the "U"-shaped deep groove 101 processed subsequently, thereby avoiding the inability of the supporting parts to smoothly punch open the barrel due to the uneven thickness of the "U"-shaped deep groove 101.

[0165] The two ends of the barrel section shell 1 are respectively fitted on the coaxial steps of the cover plate 3 and the chuck 2, so that the ends of the barrel section shell 1 are rounded through the coaxial steps to avoid its deformation, and the pull rod 4 is abutted against the annular rib 103 inside the barrel section shell 1 to support the annular rib 103, thereby supporting the inner wall of the barrel section shell 1, further reducing the risk of deformation of the barrel section shell 1.

[0166] The inner circular end face reference of the barrel section shell 1 is transferred to the cover plate 3, which overcomes the problem that the inner circular reference of the barrel section shell 1 is difficult to align; in addition, the inner circular end of the barrel section shell 1 is used for push-type placement of supporting parts, and the inner circular end of the barrel section shell 1 is used as the alignment reference surface to avoid deviation caused by the inner circular end of the barrel section shell 1, which may lead to the inability to place supporting parts, and realize the barrel body without jamming of supporting parts.

[0167] The sunken groove 102 and the "U"-shaped deep groove 101 are processed by a rough-semi-finishing-finishing processing method, wherein, in the semi-finishing process, a processing area segment with a length of 20-40 mm is used as a single processing unit. Before processing a processing area segment, a wall thickness gauge is first used to detect the wall thickness of the area segment to determine the cutting deviation during roughing, and the cutting amount of semi-finishing is adjusted based on the cutting deviation during roughing to compensate for the difference in roughing; and in the finishing process, a processing area segment with a length of 20-40 mm is used as a single processing unit. Before processing a processing area segment, a wall thickness gauge is first used to detect the wall thickness of the area segment to determine the cutting deviation during semi-finishing, and the cutting amount of finishing is adjusted based on the cutting deviation during semi-finishing to compensate for the difference in semi-finishing, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell 1 during roughing and semi-finishing.

[0168] A top support piece 6 sleeved on a pull rod 4 is filled in the rib gap 104 and fits against the inner wall of the barrel section shell 1 to support the position of the "U"-shaped deep groove 101 to be processed, further reducing the risk of deformation at the processing position of the "U"-shaped deep groove on the barrel section shell 1.

[0169] Example 1

[0170] A method for preparing a large thin-walled cylinder, comprising:

[0171] Step 1: Processing a plurality of barrel segment shells 1 to obtain a plurality of barrel segment shells 1 having “U”-shaped deep grooves 101;

[0172] Specifically, they include:

[0173] S1: Pre-processing the outer end surface of the barrel shell 1 to adjust the coaxiality and straightness of the inner and outer circular end surfaces of the barrel shell 1;

[0174] Specifically, they include:

[0175] S101: clamping the cylinder section shell 1 by means of supporting the two ends;

[0176] Specifically, they include:

[0177] S1011: Mount the chuck 2 on the turning-milling compound machining center, and screw one end of the four tie rods 4 into the mounting holes on the chuck 2 respectively;

[0178] The center line of the chuck 2 is located on a horizontal plane, that is, the chuck 2 is installed vertically.

[0179] S1012: Fit one end of the barrel housing 1 onto the coaxial step of the chuck 2;

[0180] Specifically, in the horizontal direction, the barrel section shell 1 is passed through four tie rods 4 until one end of the barrel section shell 1 fits on the coaxial step of the chuck 2. During this process, the annular rib 103 in the barrel section shell 2 abuts against the tie rod 4 to support the barrel section shell 1, which is convenient for the subsequent installation of the cover plate 3.

[0181] The outer diameter of the coaxial step on the chuck 2 is 0.2 mm smaller than the inner diameter of the opening at one end of the barrel section housing 1 .

[0182] S1013: insert the coaxial step of the cover plate 3 into the other end of the barrel section housing 1. At this time, the other end of the barrel section housing 1 fits tightly on the coaxial step of the cover plate 3.

[0183] The other ends of the four tie rods 4 pass through the corresponding mounting holes on the cover plate 3 respectively, and are exposed outside the cover plate 3 to reserve positions for nut mounting.

[0184] The outer diameter of the coaxial step on the cover plate 3 is 0.2 mm smaller than the inner diameter of the opening at the other end of the barrel section shell 1 .

[0185] S1014: by using the cooperation between the nut and the pull rod 4, the chuck 2 and the cover plate 3 are pressed onto the two ends of the barrel section shell 1, so as to clamp and fix the barrel section shell 1;

[0186] Specifically, the mounting holes on the chuck 2 and the cover plate 3 correspond to each other, and the diameter of the pull rod 4 is slightly smaller than the aperture of the mounting hole on the cover plate 3 so that one end of the pull rod 4 can pass through the mounting hole on the cover plate 3.

[0187] Among them, one end of the pull rod 4 passes through the mounting hole of the cover plate 3 and is located outside the cover plate 3. This part cooperates with the nut. When the nut is screwed in, the nut is used to squeeze the cover plate 3, and finally the chuck 2 and the cover plate 3 are squeezed at the two ends of the barrel section shell 1 to clamp and fix the barrel section shell 1.

[0188] The screw-in distances of the nuts at the ends of the four tie rods 4 are the same.

[0189] The clamping force of the cover plate 3 and the chuck 2 on the barrel section housing 1 can be adjusted by controlling the screw-in distance of the nut. The clamping force can ensure that the barrel section housing 1 can be stationary relative to the cover plate 3 and the chuck 2 during the processing.

[0190] The four tie rods 4 are respectively in contact with the annular ribs 103 inside the barrel section shell 1 to support the annular ribs 103 , thereby supporting the inner wall of the barrel section shell 1 and reducing the risk of deformation of the barrel section shell 1 .

[0191] When the barrel section housing 1 is clamped by the auxiliary tooling, the center lines of the chuck 2 and the cover plate 3 coincide with each other.

[0192] S1015: Four limiting plates 5 are respectively installed on the outer arc surfaces of the chuck 2 and the cover plate 3 to limit the barrel section shell 1 in the diameter direction of the barrel section shell 1.

[0193] Specifically, four limiting plates 5 are evenly arranged on the cover plate 3 , and the limiting plates 5 are mounted on the cover plate 3 by screws.

[0194] Among them, four limiting plates 5 are evenly arranged on the chuck 2, and the limiting plates 5 are installed on the chuck 2 by screws.

[0195] The limiting plates 5 on the cover plate 3 and the chuck 2 are distributed alternately.

[0196] S102: Taking the inner circular end surface of one end of the barrel segment shell 1 as a reference surface, the straightness and the axis centerline position of the outer end surface of the barrel segment shell 1 are adjusted.

[0197] Specifically, they include:

[0198] S1021: Determine the machining reference surface;

[0199] Specifically, the inner circular end surface at one end of the barrel section shell 1 is used as the processing reference surface, and a cover plate 3 is fastened at the end, so that when multiple barrel section shells 1 are combined into a finished barrel, the coaxiality of the multiple barrel section shells 1 is ensured to prevent the matching parts from being unable to smoothly enter and exit the barrel.

[0200] Among them, the coaxial step arranged on the pressing surface of the cover plate 3 is inserted into the opening at one end of the barrel section shell 1, and the outer diameter of the cover plate 3 is the same as the outer diameter of the barrel section shell 1 at this port. Then, the reference surface of the inner circular end of the barrel section shell 1 is transferred to the outer arc surface of the cover plate 3, so that the outer arc surface of the cover plate 3 is used as the processing reference surface.

[0201] S1022: Rough machining is performed on the outer end surface of the barrel section shell 1, with a machining allowance of 2 mm;

[0202] The wall thickness requirement of the barrel section shell 1 is 7.8 mm, that is, the wall thickness of the barrel section shell 1 is 9.8 mm, thereby ensuring the rigidity of the barrel section shell 1 and reducing the risk of deformation of the barrel section shell 1.

[0203] S1023: The barrel section shell 1 is finely processed by multiple passes, with each pass being less than or equal to 0.2 mm, until a barrel section shell 1 with a wall thickness of 7.8 mm is obtained.

[0204] Among them, after fine processing, the inner and outer end faces of the barrel shell 1 have a coaxiality of 0.05 and a straightness of 0.12.

[0205] Before the outer end surface of the barrel section shell 1 is processed, the interior of the barrel section shell 1 is a processed molding surface, that is, the interior of the barrel section shell 1 can be adapted to place corresponding parts.

[0206] S2: Align the barrel section shell 1 to determine the processing position of the “U”-shaped groove 101 on the barrel section shell 1;

[0207] Specifically, they include:

[0208] S201: Determine a horizontal plane reference line and a symmetric plane reference line of the barrel shell 1;

[0209] Specifically, the barrel shell 1 is placed on a rotating table, the inner circle of the barrel shell 1 is aligned, and the horizontal plane reference line and the symmetry plane reference line of the barrel shell are drawn as the basis for subsequent CNC milling and alignment of the barrel shell 1.

[0210] S202: Based on the determined horizontal plane reference line and symmetry plane reference line, determine the processing position of the “U”-shaped deep groove 101 on the barrel section shell 1.

[0211] There are two “U”-shaped deep grooves 101 on the barrel section shell 1, and the two “U”-shaped deep grooves 101 are symmetrically distributed.

[0212] S3: Based on the processing position of the “U”-shaped deep groove 101, pre-processing the inner cavity of the barrel section shell 1;

[0213] Specifically, the process includes: removing the auxiliary tooling, transferring the barrel section shell 1 to a milling machine, and based on the determined processing positions of the two "U"-shaped deep grooves 101 on the barrel section shell 1, milling the annular ribs 103 at corresponding positions on the inner cavity of the barrel section shell 1 to obtain a barrel section shell 1 with notches in the internal annular ribs 103, so as to avoid affecting the internal parts of the barrel from rushing out of the barrel.

[0214] The width of the annular rib notch 104 is the same as the width of the “U”-shaped deep groove 101 .

[0215] The annular ribs 103 in the barrel section shell 1 are punched out by milling.

[0216] S4: Processing a "U"-shaped deep groove 101 on the outer end surface of the barrel shell 1;

[0217] Specifically, they include:

[0218] S401: Clamp the barrel section shell 1 by using auxiliary tooling, and install the barrel section shell 1 on a horizontal lathe;

[0219] Among them, the two pull rods 4 are adjusted to be placed at the two annular rib gaps 104 respectively, and a top support 6 is sleeved on the pull rods 4 to fill the rib gaps 104 and fit on the inner wall of the barrel section shell 1 to support the position of the "U"-shaped deep groove 101 to be processed, thereby further reducing the risk of deformation at the processing position of the "U"-shaped deep groove on the barrel section shell 1.

[0220] Specifically, the supporting member 6 includes a fixing portion 601 and a supporting portion 602, wherein the fixing portion 601 is sleeved on the pull rod 4 and is slidably connected with the pull rod 4; wherein the supporting portion 602 is arranged on the fixing portion 601, and is a conformal structure at the annular rib notch 104, for being inserted into the annular rib notch 104 and fitting on the inner wall of the barrel section shell 1.

[0221] During installation, one end of the four tie rods 4 is screwed onto the chuck 2. At this time, the four tie rods 4 are cross-distributed, the barrel section shell 1 is sleeved on the tie rods 4, the coaxial step of the chuck 2 is inserted into a port of the barrel section shell 1, and the barrel section shell 1 is rotated and adjusted so that the distributed annular rib notches 104 are in a horizontal position. At this time, the supporting part 6 is sleeved on the tie rods 4 corresponding to the annular rib notches 104 and pushed forward. At this time, the support part 602 slides in the annular rib notches 104.

[0222] The other two tie rods 4 avoid the position of the annular rib notch 104 and respectively abut against the annular rib 103 inside the barrel section shell 1 .

[0223] S402: Based on the position of the U-shaped deep groove 101 to be processed, a sunken groove 102 is processed on the barrel shell 1;

[0224] Specifically, they include:

[0225] S4021: Rough machining of sink groove;

[0226] Among them, the processing tool is: Φ12mm end mill; when roughing: speed S3500r / min, feed F1500mm / min.

[0227] Among them, in the diameter direction of the barrel section shell 1, the total cutting amount of rough machining is 2 mm, which is divided into 4 passes, and each pass is in place along the axial direction of the barrel section shell 1 in one go to improve the machining efficiency.

[0228] S4022: on the basis of rough machining, semi-finishing machining is performed on the sunken groove 102;

[0229] Among them, in the axial direction of the barrel shell 1, a 30mm long processing area segment is used as a single processing unit, and a wall thickness gauge is used to detect the thickness, and the difference compensation is performed on the rough processing by substituting the difference, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell 1 during rough processing.

[0230] Specifically, before processing a processing area segment, first use a wall thickness gauge to detect the wall thickness of the area segment to determine the cutting deviation during rough processing, and adjust the cutting amount of semi-finishing based on the cutting deviation during rough processing to compensate for the difference in rough processing.

[0231] The total cutting amount of the rough machining is 2 mm. Theoretically, the remaining wall thickness at the sunken groove 102 is L-2=7.8-2=5.8 mm, where L is the wall thickness value of the barrel shell 1.

[0232] Among them, the theoretical total cutting amount during semi-finishing is 0.4mm, which is divided into 7 passes.

[0233] Before processing, use a wall thickness gauge to detect the wall thickness of the processing area and compare it with 5.8mm to obtain the absolute value of the difference with 5.8mm. At this time, if the wall thickness of the processing area is less than 5.8mm, the actual total cutting amount of the processing area is: 0.4-absolute value of the difference.

[0234] If the wall thickness of the processing area is greater than 5.8 mm, the actual total cutting amount of the processing area is: 0.4 + absolute value of the difference.

[0235] In this way, the difference compensation of rough machining is achieved, and the problem of uneven cutting amount caused by deformation of the barrel shell 1 during rough machining is overcome.

[0236] After all the processing areas are processed, a complete semi-finished sunken groove 102 is obtained.

[0237] Among them, during semi-finishing: speed S1500r / min, feed F500mm / min, processing tool: Φ12mm end mill.

[0238] S4023: Based on the semi-finishing, the sunken groove 102 is finished.

[0239] Among them, in the axial direction of the barrel shell 1, a 30mm long processing area segment is used as a single processing unit, and the thickness is detected by a wall thickness gauge, and the difference is compensated for the semi-finishing by substituting the difference, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell 1 during semi-finishing.

[0240] Specifically, before processing a processing area segment, first use a wall thickness gauge to detect the wall thickness of the area segment to determine the cutting deviation during semi-finishing, and adjust the cutting amount of finishing based on the cutting deviation during semi-finishing to compensate for the difference in semi-finishing.

[0241] The sum of the total cutting amount of rough machining and semi-finishing machining is 2+0.4=2.4 mm. Theoretically, the remaining wall thickness at the sunken groove 102 is L-2.4=7.8-2.4=5.4 mm, where L is the wall thickness value of the barrel shell 1.

[0242] Among them, the theoretical total cutting amount during finishing is 0.3mm, which is divided into 6 passes.

[0243] Before processing, use a wall thickness gauge to detect the wall thickness of the processing area and compare it with 5.4mm to obtain the absolute value of the difference with 5.4mm. At this time, if the wall thickness of the processing area is less than 5.4mm, the actual total cutting amount of the processing area is: 0.3-absolute value of the difference.

[0244] If the wall thickness of the processing area is greater than 5.4 mm, the actual total cutting amount of the processing area is: 0.3 + absolute value of the difference.

[0245] In this way, difference compensation for semi-finishing is achieved, and the problem of uneven cutting amount caused by deformation of the barrel shell 1 during semi-finishing is overcome.

[0246] After all the processing areas are processed, a complete and finely processed sunken groove 102 is obtained.

[0247] Among them, during finishing: speed S1500r / min, feed F500mm / min, processing tool: Φ12mm end mill.

[0248] In the axial direction of the barrel segment shell 1 , a margin of 15 mm is respectively provided between the two ends of the sunken groove 102 and the two ends of the barrel segment shell 1 , so as to facilitate subsequent welding connection between multiple barrel segment shells 1 .

[0249] At this time, the depth of the sunken groove 102 is 2.7 (0, +0.15) mm, and the width is 40 arc lengths.

[0250] S403 : Based on the determined position of the “U”-shaped deep groove 101 to be processed, the “U”-shaped deep groove 101 is processed in the sunken groove 102 .

[0251] Specifically, they include:

[0252] S4031: Determine the processing depth of the “U”-shaped deep groove 101;

[0253] The processing depth H of the "U"-shaped deep groove 101 satisfies:

[0254] H=LME

[0255] Wherein, L is the wall thickness of the barrel shell 1;

[0256] M is the depth of the depression 102;

[0257] E is the thickness of the “U”-shaped deep groove 101 .

[0258] Specifically, L=7.8 mm, M=2.7 mm, E=0.75 mm, at this time, H=7.8-2.7-0.75=4.35 mm.

[0259] The width of the “U”-shaped deep groove 101 is 8 arc lengths.

[0260] S4032: Rough machining of "U"-shaped deep groove 101;

[0261] Among them, the processing tool is a Φ8mm ball-end milling cutter. During roughing: speed S2500r / min, feed F1200mm / min.

[0262] Among them, in the diameter direction of the barrel section shell 1, the total cutting amount of rough machining is 2 mm, which is divided into 4 passes, and each pass is in place along the axial direction of the barrel section shell 1 in one go to improve the machining efficiency.

[0263] S4033: on the basis of rough machining, semi-finishing machining is performed on the "U"-shaped deep groove 101;

[0264] Among them, in the axial direction of the barrel shell 1, a 30mm long processing area segment is used as a single processing unit, and a wall thickness gauge is used to detect the thickness, and the difference compensation is performed on the rough processing by substituting the difference, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell 1 during rough processing.

[0265] Specifically, before processing a processing area segment, first use a wall thickness gauge to detect the wall thickness of the area segment to determine the cutting deviation during rough processing, and adjust the cutting amount of semi-finishing based on the cutting deviation during rough processing to compensate for the difference in rough processing.

[0266] The total cutting amount of the rough machining is 2 mm. Theoretically, the remaining wall thickness at the "U"-shaped deep groove 101 is L-2.7-2=7.8-2.7-2=3.1 mm, where L is the wall thickness value of the barrel shell 1.

[0267] Among them, the theoretical total cutting amount during semi-finishing is 2.1mm, which is divided into 7 passes.

[0268] Before processing, use a wall thickness gauge to detect the wall thickness of the processing area and compare it with 3.1mm to obtain the absolute value of the difference with 3.1mm. At this time, if the wall thickness of the processing area is less than 3.1mm, the actual total cutting amount of the processing area is: 2.1-absolute value of the difference.

[0269] If the wall thickness of the processing area is greater than 3.1 mm, the actual total cutting amount of the processing area is: 2.1 + absolute value of the difference.

[0270] In this way, the difference compensation of rough machining is achieved, and the problem of uneven cutting amount caused by deformation of the barrel shell 1 during rough machining is overcome.

[0271] After all the processing area segments are processed, a complete semi-finished "U"-shaped deep groove 101 is obtained.

[0272] Among them, during semi-finishing: speed S1500r / min, feed F300mm / min, and the processing tool is a Φ8mm ball head milling cutter.

[0273] S4034: Based on the semi-finishing, the “U”-shaped deep groove 101 is finished.

[0274] Among them, in the axial direction of the barrel shell 1, a 30mm long processing area segment is used as a single processing unit, and the thickness is detected by a wall thickness gauge, and the difference is compensated for the semi-finishing by substituting the difference, so as to overcome the problem of uneven cutting amount caused by deformation of the barrel shell 1 during semi-finishing.

[0275] Specifically, before processing a processing area segment, first use a wall thickness gauge to detect the wall thickness of the area segment to determine the cutting deviation during semi-finishing, and adjust the cutting amount of finishing based on the cutting deviation during semi-finishing to compensate for the difference in semi-finishing.

[0276] The sum of the total cutting amount of rough machining and semi-finishing is 2+2.1=4.1 mm. Theoretically, the remaining wall thickness at the "U"-shaped deep groove 101 is L-2.7-4.1=7.8-2.7-4.1=1 mm, where L is the wall thickness value of the barrel shell 1.

[0277] Among them, the theoretical total cutting amount during finishing is 0.25mm, which is divided into 6 passes.

[0278] Before processing, use a wall thickness gauge to detect the wall thickness of the processing area and compare it with 1mm to obtain the absolute value of the difference with 1mm. At this time, if the wall thickness of the processing area is less than 1mm, the actual total cutting amount of the processing area is: 0.25-absolute value of the difference.

[0279] If the wall thickness of the processing area is greater than 1mm, the actual total cutting amount of the processing area is: 0.25 + absolute value of the difference.

[0280] In this way, difference compensation for semi-finishing is achieved, and the problem of uneven cutting amount caused by deformation of the barrel shell 1 during semi-finishing is overcome.

[0281] After all the processing area segments are processed, a complete and finely processed "U"-shaped deep groove 101 is obtained.

[0282] Among them, during finishing: speed S1500r / min, feed F300mm / min, and the processing tool is a Φ8mm ball head milling cutter.

[0283] In the axial direction of the barrel section shell 1 , a margin of 15 mm is respectively provided between the two ends of the “U”-shaped deep groove 101 and the two ends of the barrel section shell 1 , so as to facilitate subsequent welding connection between multiple barrel section shells 1 .

[0284] At this time, the depth dimension of the “U”-shaped deep groove 101 is 4.35 mm, the width is 8 arc lengths, and the “U”-shaped deep groove 101 is located in the middle of the sunken groove 102 .

[0285] The “U”-shaped deep groove 101 and the sunken groove 102 are of equal length.

[0286] Step 2: Based on steps 1 to 4, a plurality of barrel segment shells 1 are obtained, and the plurality of barrel segment shells 1 are welded into shape to obtain a barrel body.

[0287] Specifically, they include:

[0288] S5: placing a plurality of barrel segment shells 1 on a welding platform and adjusting the coaxiality of the plurality of barrel segment shells 1;

[0289] The method includes adjusting the barrel section shells 1 so that the “U”-shaped deep grooves of adjacent barrel section shells 1 are aligned.

[0290] Among them, the number of barrel segment shells 1 is 5.

[0291] S6: welding a plurality of barrel segment shells 1 into shape;

[0292] After the plurality of cylinder segment shells 1 are welded and formed, the open ends of the adjacent cylinder segment shells 1 are connected, and at this time, the “U”-shaped deep grooves 101 on all the cylinder segment shells 1 are aligned.

[0293] S7: Process the excess at both ends of each cylinder segment shell 1 so that the sunken grooves 102 and the "U"-shaped deep grooves 101 of adjacent cylinder segment shells 1 are connected to obtain a finished cylinder.

[0294] Among them, Fig.10 As shown, the positions to be processed after welding forming include a, b, c, d, e, and f.

[0295] When the recessed groove 102 is processed on the end margin of the cylinder section shell 1, the processing method of step S402 is adopted.

[0296] Among them, after the sunken groove 102 of the excess at the end of the cylinder section shell 1 is processed, the "U"-shaped deep groove 101 is processed. The processing method adopts step S403. Among them, in step S403, the theoretical total cutting amount of rough processing, semi-finishing processing, and finishing processing are 2mm, 1.9mm, and 0.15mm respectively. At this time, the remaining theoretical wall thickness of the "U"-shaped deep groove 101 is 1.05mm, and the processing allowance is 0.3mm. Finally, the 0.3mm processing allowance is processed by manual grinding to finally obtain the finished cylinder.

[0297] After the barrel section shell 1 is welded and formed, the existing three-jaw chuck clamping support method is adopted to support the openings at both ends.

[0298] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0299] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for preparing a large thin-walled cylinder, characterized in that: include: Step 1: Processing a plurality of barrel segment shells to obtain a plurality of barrel segment shells having "U"-shaped deep grooves; Step 2: Welding multiple cylinder segment shells to obtain a cylinder body; Wherein, in step 1, the inner circular end surface of the barrel section shell is used as a reference surface to process the barrel section shell; Among them, the "U"-shaped groove is processed by rough machining-semi-finishing-finishing processing method; In the semi-finishing and finishing processes, the processing area segment with a length of 20-40 mm is regarded as a single processing unit; The step 1 comprises: S1: Pre-process the outer end surface of the barrel shell to adjust the coaxiality and straightness of the inner and outer circular end surfaces of the barrel shell; S2: Align the barrel shell and determine the processing position of the "U"-shaped deep groove on the barrel shell; S3: Based on the processing position of the "U"-shaped deep groove, the inner cavity of the barrel shell is pre-processed; S4: Processing a "U"-shaped deep groove on the outer end surface of the barrel shell; The S4 includes: S401: Clamp the barrel segment shell by using auxiliary tooling, and install the barrel segment shell on a horizontal lathe; S402: Based on the position of the "U"-shaped deep groove to be processed, a sunken groove is processed on the barrel shell by a rough processing-semi-finishing-finishing method; S403: Based on the determined "U"-shaped deep groove to be processed position, the "U"-shaped deep groove is processed in the sunken groove by adopting a rough processing-semi-finishing-finishing method.

2. The method according to claim 1, characterized in that The step 2 comprises: S5: placing multiple barrel segment shells on a welding platform and adjusting the coaxiality of the multiple barrel segment shells; S6: welding a plurality of barrel segment shells into shape; S7: Process the excess at both ends of each cylinder segment shell so that the sunken grooves and "U"-shaped deep grooves of adjacent cylinder segment shells are connected to obtain a finished cylinder body.

3. The method according to claim 1, characterized in that The S1 includes: S101: clamping the barrel segment shell by using auxiliary tooling, and installing the barrel segment shell on a horizontal lathe; S102: Taking the inner circular end surface of one end of the barrel shell as a reference surface, the straightness and the axis centerline position of the outer end surface of the barrel shell are adjusted.

4. The method according to claim 3, characterized in that: The auxiliary tooling includes a chuck, a cover plate and multiple pull rods. When clamping, the chuck and the cover plate are placed at both ends of the barrel section shell, and the two ends of the pull rod are respectively connected to the chuck and the cover plate to tighten the chuck and the cover plate at the two end openings of the barrel section shell.

5. The method according to claim 4, characterized in that: The chuck and the cover plate are provided with coaxial steps. When clamping, the coaxial steps on the chuck and the cover plate are respectively inserted into the openings at both ends of the barrel section shell to support the end openings of the barrel section shell.

6. The method according to claim 4, characterized in that: The chuck and the cover plate are correspondingly provided with a plurality of groups of mounting holes so as to adjust the mounting position of the pull rod through the mounting holes; During installation, two ends of the pull rod are respectively inserted into a group of installation holes.

7. The method according to claim 5, characterized in that: It also includes a top holding member, the top holding member includes a fixing portion and a supporting portion, the fixing portion is used to be sleeved on the pull rod and slidably connected with the pull rod; wherein the supporting portion is arranged on the fixing portion; Among them, S3 includes milling the internal annular ribs of the barrel section shell to obtain a barrel section shell with a notch in the internal annular ribs, and the support part is a conformal structure at the notch of the annular rib, which is used to be inserted into the notch of the annular rib and fit on the inner wall of the barrel section shell.

8. The method according to claim 1, characterized in that: In the semi-finishing process, the processing area segment with a length of 20-40 mm is used as a single processing unit. The cutting amount of semi-finishing is adjusted based on the cutting deviation during roughing, and the difference compensation of roughing is performed; During the finishing process, the processing area segment with a length of 20-40 mm is used as a single processing unit. The cutting amount of the finishing is adjusted based on the cutting deviation during semi-finishing, and the difference compensation is performed on the semi-finishing.

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