CN116100263B

CN116100263B - A method for preparing a large thin-walled cylinder

Info

Publication number: CN116100263B
Application number: CN202310217576.2A
Authority: CN
Inventors: 王炳达; 邢鹏; 石维娜; 武晓会; 张亚雄; 温玉旺; 尉渊; 唐慧霖
Original assignee: Beijing Xinghang Electromechanical Equipment Co Ltd
Current assignee: Beijing Xinghang Electromechanical Equipment Co Ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2025-03-18
Anticipated expiration: 2043-03-08
Also published as: CN116100263A

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 processing 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

Preparation method of large thin-wall cylinder

Technical Field

The invention relates to the technical field of large-scale cylinder processing, in particular to a preparation method of a large-scale thin-wall cylinder.

Background

A certain ultra-large cylinder is one of important components of the spacecraft, matched parts are assembled in the ultra-large cylinder, U-shaped deep grooves are axially distributed on the outer end face of the cylinder, and the U-shaped deep grooves are equal to the cylinder in length. The inner cavity of the cylinder body needs to ensure that the matched parts smoothly enter and exit without clamping stagnation, and meanwhile, the U-shaped deep grooves need to be uniform in wall thickness so as to ensure that the matched parts positioned in the cylinder body can be punched out under the environment that fluid resistance exists, so that the matched parts smoothly enter and exit the cylinder body without clamping stagnation.

At present, the inner circle of the shell is clamped and supported by a three-jaw chuck of a machine tool to process the inner circle and the outer circle of the shell, and the U-shaped deep groove is processed in a layering manner by adopting a constant value feeding mode of each layer.

However, because the contact area between the three claws and the part is limited, the three claws cannot play a good supporting and fixing role, so that corresponding form and position tolerance of the thin-wall part is difficult to ensure in the inner and outer circle processing, the follow-up procedure is not facilitated, the U-shaped deep groove wall is thin and has large span, the part is easy to deform during cutting due to insufficient supporting force, and finally the thickness of the U-shaped deep groove wall is extremely uneven, so that the follow-up use is seriously influenced.

Disclosure of Invention

In view of the above analysis, the embodiment of the invention aims to provide a preparation method of a large thin-wall cylinder body, which is used for solving the problems that a large-size thin-wall part is easy to deform and the wall thickness of a thin-wall deep groove is uneven in the prior art processing.

In one aspect, the embodiment of the invention provides a method for preparing a large thin-wall cylinder, which comprises the following steps:

step 1, processing a plurality of cylinder section shells to obtain a plurality of cylinder section shells with U-shaped deep grooves;

Step 2, welding and forming a plurality of cylinder section shells to obtain a cylinder body;

in the step 1, the inner circular end face of the cylinder section shell is used as a reference surface to process the cylinder section shell;

wherein, a rough machining, semi-finishing and finishing machining mode is adopted to machine the U-shaped groove;

in the semi-finishing and finishing processes, a machining area section with the length of 20-40mm is taken as a single machining unit.

Further, the step 1 includes:

S1, preprocessing the outer end surface of a cylinder section shell, and adjusting the coaxiality and straightness of the inner and outer circular end surfaces of the cylinder section shell;

S2, aligning the shell of the barrel section, and determining the machining position of the U-shaped deep groove on the shell of the barrel section;

S3, preprocessing the inner cavity of the shell of the barrel section based on the processing position of the U-shaped deep groove;

s4, machining a U-shaped deep groove on the outer end face of the barrel section shell.

Further, the step 2 includes:

S5, placing a plurality of cylinder section shells on a welding platform, and adjusting coaxiality of the cylinder section shells;

s6, welding and forming a plurality of cylinder section shells;

and S7, machining the allowance of the two ends of each barrel section shell, so that the sinking grooves of the adjacent barrel section shells are communicated with the U-shaped deep grooves, and a finished barrel is obtained.

Further, the step S1 includes:

s101, clamping a cylinder section shell by using an auxiliary tool, and installing the cylinder section shell on a horizontal lathe;

S102, taking the inner circular end face of one end of the cylinder section shell as a reference surface, and adjusting the straightness and the axial lead position of the outer end face of the cylinder section shell.

Further, the step S4 includes:

s401, clamping a cylinder section shell by using an auxiliary tool, and installing the cylinder section shell on a horizontal lathe;

s402, machining a sinking groove on a shell of the barrel section in a rough machining-semi-finishing mode based on a to-be-machined position of the U-shaped deep groove;

s403, machining the U-shaped deep groove in the sinking groove in a rough machining-semi-finishing mode based on the determined position to be machined of the U-shaped deep groove.

Further, the auxiliary fixture comprises a chuck, a cover plate and a plurality of pull rods, wherein during clamping, the chuck and the cover plate are arranged at two ends of the shell of the barrel section, two ends of the pull rods are respectively connected with the chuck and the cover plate, and the chuck and the cover plate are tightly pressed at openings at two ends of the shell of the barrel section.

Further, coaxial steps are arranged on the chuck and the cover plate, and when clamping is performed, the coaxial steps on the chuck and the cover plate are respectively inserted into openings at two ends of the shell of the cylinder section so as to support the openings at the ends of the shell of the cylinder section.

Further, a plurality of groups of mounting holes are correspondingly formed in the chuck and the cover plate, so that the mounting positions of the pull rods can be adjusted through the mounting holes;

when in installation, two ends of the pull rod are respectively inserted into a group of installation holes correspondingly.

The device further comprises a jacking piece, wherein the jacking piece comprises a fixing part and a supporting part, the fixing part is used for being sleeved on the pull rod and is connected with the pull rod in a sliding way, and the supporting part is arranged on the fixing part;

The S3 comprises milling of annular ribs inside the barrel section shell to obtain the barrel section shell with notches in the annular ribs, and the supporting part is of a follow-up structure at the notches of the annular ribs and is used for being inserted into the notches of the annular ribs and attached to the inner wall of the barrel section shell.

Further, in the semi-finishing process, a machining area section with the length of 20-40mm is taken as a single machining unit, the cutting amount of the semi-finishing is adjusted based on the cutting deviation in the rough machining, and the difference value compensation is carried out on the rough machining;

In the finishing process, a machining area section with the length of 20-40mm is taken as a single machining unit, the cutting amount of finishing is adjusted based on cutting deviation in semi-finishing, and differential compensation is carried out on the semi-finishing.

Compared with the prior art, the invention has at least one of the following beneficial effects:

1. According to the invention, after each cylinder section shell is independently processed, a plurality of cylinder section shells are combined and formed in a welding mode, wherein when the cylinder section shells are processed, the cylinder section shells are processed by using the reference of the inner circle end surfaces of the cylinder section shells, so that the situation that the matched parts cannot be placed due to deviation of the inner circle ends of the cylinder section shells is avoided, and the purpose that the matched parts can enter and exit the cylinder without clamping stagnation is realized.

2. The method comprises the steps of adopting a rough machining, semi-finishing and finishing machining mode to machine a sinking groove and a U-shaped deep groove, wherein in the semi-finishing machining process, a machining area section with the length of 20-40mm is used as a single machining unit, before machining one machining area section, firstly, the wall thickness of the area section is detected by a wall thickness meter, the cutting deviation in rough machining is determined, the cutting quantity of the semi-finishing machining is adjusted based on the cutting deviation in rough machining so as to carry out differential compensation on the rough machining, in the finishing machining process, the wall thickness of the machining area section with the length of 20-40mm is used as a single machining unit, before machining one machining area section, firstly, the wall thickness of the area section is detected by the wall thickness meter, the cutting deviation in semi-finishing machining is determined, and the cutting quantity of the finishing machining is adjusted based on the cutting deviation in semi-finishing machining so as to carry out differential compensation on the semi-finishing machining, and the problem that the cutting quantity is uneven due to deformation of a barrel section shell during rough machining and semi-finishing machining is solved.

3. The outer end face of the barrel section shell is preprocessed to adjust the coaxiality and straightness of the inner round end face and the outer round end face of the barrel section shell, so that uniformity of wall thickness of the barrel section shell is adjusted, uniformity of wall thickness of a U-shaped deep groove in subsequent processing is further ensured, and accordingly uneven thickness of the U-shaped deep groove is avoided, and the matched parts cannot be smoothly punched.

4. The two ends of the cylinder section shell are respectively attached and sleeved on the coaxial steps of the cover plate and the chuck, so that the end part of the cylinder section shell is rounded through the coaxial steps, the deformation of the cylinder section shell is avoided, the annular rib is supported through the annular rib butt joint of the pull rod and the inside of the cylinder section shell, the support of the inner wall of the cylinder section shell is further realized, and the deformation risk of the cylinder section shell is further reduced.

5. In addition, the inner circle end of the cylinder section shell is used for placing matched parts in a pushing mode, the inner circle end of the cylinder section shell is used as a centering reference surface, the situation that the matched parts cannot be placed due to deviation of the inner circle end of the cylinder section shell is avoided, and the fact that the matched parts can enter and exit the cylinder section shell without clamping stagnation is achieved.

6. The jacking piece sleeved on one pull rod is filled in the rib notch and attached to the inner wall of the barrel section shell, so that the position to be processed of the U-shaped deep groove is supported, and the risk of deformation of the U-shaped deep groove processing part on the barrel section shell is further reduced.

In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.

FIG. 1 is a flow chart of a method for processing a U-shaped deep groove of a thin-wall cylinder section shell;

FIG. 2 is a schematic view of the structure of the inner annular rib notch of the shell of the barrel section after processing;

FIG. 3 is a schematic cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is a schematic structural view of the auxiliary tool of the present invention when clamping a shell of a barrel section;

FIG. 5 is a schematic view of the structure of the sinking groove and the U-shaped deep groove in the invention;

FIG. 6 is a schematic view of a top holder according to the present invention;

FIG. 7 is a schematic cross-sectional view taken at B-B of FIG. 6;

FIG. 8 is a schematic view of the chuck and cover plate structure of the present invention;

FIG. 9 is a three-dimensional schematic diagram of an auxiliary tool of the present invention clamping a shell of a cartridge segment;

Fig. 10 is a schematic structural view of a plurality of barrel section shells combined into a barrel body in the invention.

Reference numerals:

1-barrel section shell, 101-U-shaped deep groove, 102-sinking groove, 103-annular rib, 104-annular rib notch, 2-chuck, 3-cover plate, 4-pull rod, 5-limit plate, 6-supporting piece, 601-fixing part, 602-supporting part, 8-axis direction of barrel section shell, 9-horizontal plane datum line, 10-symmetrical plane datum line, L-barrel section shell wall thickness, M-sinking groove depth, E-U-shaped deep groove thickness and a, b, c, d, E, f-barrel section shell point position to be processed after welding and forming.

Detailed Description

The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.

A certain ultra-large cylinder body is one of important components of the spacecraft, the length of the ultra-large cylinder body is 5-6m, U-shaped deep grooves are axially distributed on the outer end face of the cylinder body, and the U-shaped deep grooves are equal to the cylinder body in length. The inner cavity of the cylinder body needs to ensure that matched parts can smoothly enter and exit without clamping stagnation, and meanwhile, the outer circle U-shaped deep groove needs to be uniform in wall thickness, so that the assembly of the parts and the cutting and separation in flight can be realized.

The inner wall and the outer wall of the barrel blank are uneven, and a plurality of annular ribs are arranged on the inner wall so as to improve the strength of the barrel, and generally, after each barrel section shell is independently processed, a plurality of barrel section shells are combined and formed in a welding mode so as to obtain the finished barrel.

The cylinder has very high precision requirements, otherwise, the matched parts cannot break the cylinder, and the corresponding functions cannot be realized. For any barrel section shell, the shell wall thickness is thin and the rigidity is weak, the U-shaped deep groove span is large (1172 mm), the groove wall thickness is thin (0.75 mm), the machining range is large, and when the U-shaped deep groove is machined, the barrel section shell is easy to deform, the wall thickness precision of the U-shaped deep groove is influenced, and the wall thickness precision of the U-shaped deep groove of a finished barrel part is influenced, so that the barrel body can not be smoothly and smoothly moved in and out without clamping stagnation by matched parts.

In order to solve the problems, the invention provides a preparation method of a large thin-wall cylinder, which comprises the following steps:

Step 1, processing a plurality of barrel section shells 1 to obtain a plurality of barrel section shells 1 with U-shaped deep grooves 101;

Step2, welding and forming a plurality of cylinder section shells 1 to obtain a cylinder body;

In the step 1, the inner circular end face of the cylinder section shell 1 is used as a reference surface to process the cylinder section shell 1;

wherein, the U-shaped groove 101 is processed by adopting a rough processing, semi-finishing and finishing processing mode;

Wherein all machining units constitute a complete "U" shaped deep groove 101 machining area.

Compared with the prior art, the invention has the advantages that each barrel section shell 1 is firstly processed independently, and then a plurality of barrel section shells 1 are combined and formed in a welding mode, wherein when the barrel section shells 1 are processed, the barrel section shells are processed by using the standard of the inner circle end surfaces of the barrel section shells 1, the problem that the matched parts cannot be placed due to deviation of the inner circle ends of the barrel section shells 1, and the matched parts can enter and exit the barrel body without clamping stagnation is avoided, and the U-shaped deep groove 101 is processed by using a processing area section with the length of 20-40mm as a single processing unit in a rough processing-semi-finishing processing mode, so that the problem of uneven cutting amount caused by deformation of the barrel section shells 1 in rough processing and semi-finishing processing is solved.

Specifically, in step 1, the method includes:

S1, preprocessing the outer end surface of a cylinder section shell 1, and adjusting the coaxiality and straightness of the inner and outer circular end surfaces of the cylinder section shell 1;

S2, aligning the barrel section shell 1, and determining the machining position of the U-shaped deep groove on the barrel section shell 1;

S3, preprocessing the inner cavity of the shell 1 of the barrel section based on the processing position of the U-shaped deep groove 101;

s4, machining a U-shaped deep groove 101 on the outer end face of the barrel section shell 1.

Wherein, in S1, it includes:

s101, clamping a cylinder section shell 1 by adopting a mode of supporting circles at two ends;

Specifically, the cylinder section shell 1 is clamped by using an auxiliary tool, and the cylinder section shell 1 is mounted on a horizontal lathe.

As shown in fig. 2-9, the auxiliary tool comprises a chuck 2, a cover plate 3 and a plurality of pull rods 4, wherein during clamping, the chuck 2 and the cover plate 3 are arranged at two ends of the barrel section shell 1, and two ends of the pull rods 4 are respectively connected with the chuck 2 and the cover plate 3 and used for tightly pressing the chuck 2 and the cover plate 3 at openings at two ends of the barrel section shell 1.

Specifically, one end face of the chuck 2 is a mounting face and is used for being mounted on a machine tool, the other end face of the chuck is a compression face, and the chuck is extruded at an opening at one end of the barrel section shell 1 under the stretching action of the pull rod 4.

Further, the pressing surface of the chuck 2 is provided with a coaxial step, the outer diameter of the coaxial step is 0.1-0.2mm smaller than the inner diameter of the opening at one end of the barrel section shell 1, and when the clamping is performed, the coaxial step arranged at the pressing surface of the chuck 2 is inserted into the opening at the end of the barrel section shell 1 and used for supporting the opening at the end of the barrel section shell 1 so as to avoid deformation of the port of the barrel section shell 1.

Specifically, one end face of the cover plate 3 is a compression face, and when clamping, the compression face of the cover plate 3 is extruded at the opening of the other end of the barrel section shell 1 under the stretching action of the pull rod 4.

Further, a coaxial step is arranged on the compression surface of the cover plate 3, the outer diameter of the coaxial step is 0.1-0.2mm smaller than the inner diameter of the opening at the other end of the barrel section shell 1, and when the barrel section shell is clamped, the coaxial step arranged at the compression 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 so as to avoid deformation of the end of the barrel section shell 1.

Further, the outer diameters of the chuck 2 and the cover plate 3 are the same as the outer diameters of the two end ports of the barrel section shell 1, and a plurality of limiting plates 5 are arranged on the outer cambered surfaces of the chuck 2 and the cover plate 3 respectively and used for limiting the barrel section shell 1 in the diameter direction of the barrel section shell 1 so as to ensure that the barrel section shell 1 cannot slide and avoid affecting the machining precision.

Specifically, be equipped with a plurality of pull rods 4, the one end and the chuck 2 spiro union of pull rod 4, the other end free pass apron 3 of pull rod 4, and during the clamping, the cooperation of the tip of the pull rod 4 that is located apron 3 department is equipped with the nut, precesses the nut, extrudes apron 3 through the nut, and then extrudes section of thick bamboo casing 1 through apron 3, realizes in section of thick bamboo casing 1's axle center direction, and is fixed to section of thick bamboo casing clamping.

Furthermore, a plurality of groups of mounting holes are correspondingly formed in the chuck 2 and the cover plate 3 so as to adjust the mounting positions of the pull rods 4 through the mounting holes, and when the barrel section shell is mounted, two ends of the pull rods 4 are respectively and correspondingly inserted into one group of mounting holes and are matched with the pull rods 4 through nuts, so that the chuck 2 and the cover plate 3 are extruded at two ends of the barrel section shell 1.

Further, a plurality of pull rods 4 are abutted with the annular ribs 103 so as to support the annular ribs 103, further support the inner wall of the barrel section shell 1 is achieved, and the risk of deformation of the barrel section shell 1 is reduced.

S102, taking the inner circular end surface of one end of the cylinder section shell 1 as a reference surface, and adjusting the straightness and the axial lead position of the outer end surface of the cylinder section shell 1;

Specifically, the method comprises the following steps:

s1021, determining a machining reference surface;

Specifically, the inner circular end face at one port of the cylinder section shell 1 is used as a processing reference surface, and the cover plate 3 is fastened at the port, so that when a plurality of cylinder section shells 1 are combined into a finished cylinder body, the coaxiality of the cylinder section shells 1 is ensured, and the situation that matched parts cannot smoothly enter and exit the cylinder body is avoided.

Wherein, coaxial step that sets up on the compression face of apron 3 inserts in the opening of section of thick bamboo casing 1 one end, and the external diameter of apron 3 is the same with the external diameter of section of thick bamboo casing 1 this port department, and then, the reference surface of section of thick bamboo casing 1's interior round end conveys to the extrados department of apron 3 to this regard the extrados of apron 3 as the processing reference surface.

S1022, rough machining is carried out on the outer end face of the cylinder section shell 1, and the machining allowance is 2-3mm;

the wall thickness of the cartridge segment housing 1 is required to be 7.8mm, namely, the wall thickness of the cartridge segment housing 1 is 9.8-10.8mm at the moment, so that the rigidity of the cartridge segment housing 1 is ensured, and the deformation risk of the cartridge segment housing 1 is reduced.

S1023, carrying out finish machining on the cylinder section shell 1 by multiple feeding, wherein each feeding is less than or equal to 0.2mm until the cylinder section shell 1 with the wall thickness of 7.8mm is obtained.

Wherein, in S2, it includes:

S201, determining a horizontal and symmetrical plane datum line of the cylinder section shell 1;

Specifically, the cylinder section shell 1 is placed on a rotary table, the inner circle of the cylinder section shell 1 is aligned, and a horizontal plane datum line and a symmetrical plane datum line of the cylinder section shell 1 are drawn to serve as the basis for subsequent milling alignment of the cylinder section shell 1.

S202, determining the machining position of the U-shaped deep groove 101 on the barrel section shell 1 based on the determined horizontal plane datum line and the symmetry plane datum line.

Wherein, two U-shaped deep grooves 101 are arranged on the barrel section shell 1, and the two U-shaped deep grooves 101 are symmetrically distributed.

The S3 comprises the steps of removing an auxiliary tool, transferring the barrel section shell 1 to a milling machine, and milling the annular rib 103 at the corresponding position on the inner cavity of the barrel section shell 1 based on the determined machining positions of the two U-shaped deep grooves 101 on the barrel section shell 1 to obtain the barrel section shell 1 with the notch on the inner annular rib 103 so as to avoid the subsequent influence on the punching of the inner parts of the barrel body.

Wherein, in S4, it includes:

s401, clamping the cylinder section shell 1 by using an auxiliary tool, and installing the cylinder section shell 1 on a horizontal lathe;

Wherein, two annular muscle breach 104 departments are arranged respectively in to two pull rods 4 of regulation, and the cover has a top to hold piece 6 on the pull rod 4 for fill the muscle breach 104, and the laminating is on the inner wall of section of thick bamboo casing 1, with the position of waiting to process to support "U" type deep groove 101, further reduces the risk that "U" type deep groove processing department deformation on the section of thick bamboo casing 1.

Specifically, the propping piece 6 comprises a fixing part 601 and a supporting part 602, wherein the fixing part 601 is sleeved on the pull rod 4 and is in sliding connection with the pull rod 4, and the supporting part 602 is arranged on the fixing part 601, is of a follow-up structure at the annular rib notch 104, is used for being inserted into the annular rib notch 104 and is attached to the inner wall of the shell 1 of the barrel section.

During installation, one ends of the 4 pull rods 4 are in threaded connection with the chuck 2, at the moment, the 4 pull rods 4 are distributed in a cross mode, the barrel section shell 1 is sleeved on the pull rods 4, the coaxial steps of the chuck 2 are inserted into one port of the barrel section shell 1, the barrel section shell 1 is rotated and adjusted, the distributed annular rib gaps 104 are positioned at the horizontal position, at the moment, the jacking piece 6 is sleeved on the pull rods 4 corresponding to the annular rib gaps 104, and the jacking piece is pushed in, at the moment, the supporting portion 602 slides in the annular rib gaps 104.

The rest 2 pull 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 so as to support the annular rib 103, further support the inner wall of the barrel section shell 1, and further reduce the deformation risk of the barrel section shell 1.

S402, machining a sinking groove 102 on the barrel section shell 1 in a rough machining-semi-finishing mode based on the to-be-machined position of the U-shaped deep groove 101;

Specifically, the method comprises the following steps:

S4021, roughly machining the sinking groove 102 by adopting a one-time feeding in-place mode;

specifically, in the diameter direction of the barrel section shell 1, the cutting is carried out for a plurality of times, and each time the cutting is carried out, the cutting is carried out once along the axial direction of the barrel section shell 1, so that the processing efficiency is improved.

S4022, semi-finishing the sinking groove 102 on the basis of rough machining, and compensating the difference value of the rough machining;

in the axial direction of the cylinder section shell 1, a machining area section with the length of 20-40mm is taken as a single machining unit, the thickness is detected by using a wall thickness meter, and the difference value is compensated for rough machining in a mode of substituting the difference value, so that the problem that the cutting amount is uneven due to deformation of the cylinder section shell 1 during rough machining is solved.

Specifically, before machining a machining region, the wall thickness of the region is first detected by a wall thickness gauge, the cutting deviation in rough machining is determined, and the amount of semi-finished machining is adjusted based on the cutting deviation in rough machining to compensate for the difference in rough machining.

Based on the wall thickness value of the shell 1 of the barrel section and the total cutting amount of rough machining, the theoretical wall thickness value of the sinking groove 102 after rough machining is obtained, the actual wall thickness value of the sinking groove 102 of the machining area section is compared with the theoretical wall thickness value, and the cutting deviation after rough machining is obtained.

Further, the actual cut amount of the semi-finishing is adjusted based on the cut deviation after the rough machining of the machining region segment so that the actual cut amount of the rough machining-semi-finishing of the machining region segment coincides with the theoretical cut amount.

Thus, the differential compensation for rough machining is realized, and the problem that the cutting amount is uneven due to deformation of the barrel section shell 1 during rough machining is solved.

Wherein after all the machining area sections are machined, a complete semi-finished undercut 102 is obtained.

And S4023, finishing the sunken groove 102 on the basis of semi-finishing, and compensating the difference value of the semi-finishing.

In the axial direction of the barrel section shell 1, a machining area section with the length of 20-40mm is taken as a single machining unit, the thickness is detected by using a wall thickness meter, and the difference value compensation is carried out on semi-finishing in a mode of substituting a difference value, so that the problem that the cutting amount is uneven due to deformation of the barrel section shell 1 during semi-finishing is solved.

Specifically, before machining a machining area section, the wall thickness of the area section is detected by a wall thickness gauge, the cutting deviation during semi-finishing is determined, and the cutting amount of the semi-finishing is adjusted based on the cutting deviation during the semi-finishing so as to perform differential compensation on the semi-finishing.

Based on the wall thickness value of the shell 1 of the barrel section and the total cutting amount of rough machining and semi-finishing, the theoretical wall thickness value of the sinking groove 102 after semi-finishing is obtained, the actual wall thickness value of the sinking groove 102 of the machining area section is compared with the theoretical wall thickness value, and the cutting deviation after semi-finishing is obtained.

Further, the actual cut amount of finish machining is adjusted based on the cut deviation after semi-finish machining of the machining region segment so that the actual cut amount of rough machining-semi-finish machining of the machining region segment coincides with the theoretical cut amount.

Therefore, differential compensation is realized for semi-finishing, and the problem that the cutting amount is uneven due to deformation of the barrel section shell 1 during semi-finishing is solved.

Wherein, after all the processing area sections are processed, the complete sinking groove 102 after finish processing is obtained.

Illustratively, the undercut groove 102 has a depth dimension of 2.7 (0, +0.15) mm and a width of 40 arc lengths.

In the axial direction of the barrel section shell 1, a margin of 15mm is respectively arranged between two ends of the sinking groove 102 and two ends of the barrel section shell 1, so that a plurality of barrel section shells 1 can be welded and connected subsequently.

S403, machining the U-shaped deep groove 101 in the sinking groove 102 in a rough machining-semi-finishing mode based on the determined position to be machined of the U-shaped deep groove 101.

Specifically, the method comprises the following steps:

s4031, determining the machining depth of the U-shaped deep groove 101;

Wherein, the machining depth H of the U-shaped deep groove 101 meets the following conditions:

H=L-M-E

Wherein L is the wall thickness of the shell 1 of the barrel section;

m is the depth of the undercut 102;

E is the wall thickness at the "U" shaped deep groove 101.

Illustratively, l=7.8 mm, m=2.7 mm, e=0.75 mm, at which point h=7.8-2.7-0.75=4.35 mm.

S4032, roughly machining a U-shaped deep groove 101 by adopting a one-time feeding in-place mode;

S4033, semi-finishing the U-shaped deep groove 101 on the basis of rough machining, and compensating the difference value of the rough machining;

Specifically, in the axial direction of the cylinder section shell 1, a machining area section with the length of 20-40mm is taken as a single machining unit, the thickness is detected by using a wall thickness meter, and the difference value is compensated for rough machining in a mode of substituting a difference value, so that the problem that the cutting amount is uneven due to deformation of the cylinder section shell 1 during rough machining is solved.

Before machining a machining area, the wall thickness of the machining area is detected by a wall thickness gauge, cutting deviation in rough machining is determined, and the cutting amount of semi-finishing machining is adjusted based on the cutting deviation in rough machining so as to perform differential compensation on rough machining.

Based on the wall thickness value of the barrel section shell 1, the total machining cutting amount of the sunken groove 102 and the total roughing cutting amount, the theoretical wall thickness value of the U-shaped deep groove 101 after roughing is obtained, the actual wall thickness value of the U-shaped deep groove 101 of the machining area section is compared with the theoretical wall thickness value, and the cutting deviation after roughing is obtained.

Further, the actual cut amount of the semi-finishing is adjusted based on the cut deviation after the rough machining of the machining region segment so that the sum of the actual cut amount of the depressed groove 102 of the machining region segment and the actual cut amount of the rough machining-semi-finishing of the "U" shaped deep groove 101 coincides with the sum of the theoretical cut amounts.

Wherein, after all the processing area sections are processed, a complete semi-finished U-shaped deep groove 101 is obtained.

S4034, carrying out finish machining on the U-shaped deep groove 101 on the basis of semi-finish machining, and carrying out difference compensation on the semi-finish machining.

Specifically, in the axial direction of the barrel section shell 1, a machining area section with the length of 20-40mm is taken as a single machining unit, the thickness is detected by using a wall thickness meter, and the difference value compensation is carried out on semi-finishing in a mode of substituting a difference value, so that the problem that the cutting amount is uneven due to deformation of the barrel section shell 1 during semi-finishing is solved.

Before machining a machining area section, firstly detecting the wall thickness of the area section by using a wall thickness meter, determining cutting deviation during semi-finishing, and adjusting the cutting quantity of finishing based on the cutting deviation during semi-finishing so as to perform differential compensation on the semi-finishing.

Based on the wall thickness value of the barrel section shell 1, the total machining cutting amount of the sinking groove 102 and the rough machining-semi-finishing total cutting amount, the theoretical wall thickness value of the semi-finishing U-shaped deep groove 101 is obtained, the actual wall thickness value of the U-shaped deep groove 101 of the machining area section is compared with the theoretical wall thickness value, and the cutting deviation after semi-finishing is obtained.

Further, the actual cut amount of finish machining is adjusted based on the cut deviation after semi-finish machining of the machining region segment so that the sum of the actual cut amount of the depressed groove 102 of the machining region segment and the actual cut amount of rough machining-semi-finish machining of the "U" shaped deep groove 101 coincides with the sum of theoretical cut amounts.

Wherein, after all the processing area sections are processed, the complete finish-processed U-shaped deep groove 101 is obtained.

In the axial direction of the barrel section shell 1, a margin of 15mm is respectively arranged between two ends of the U-shaped deep groove 101 and two ends of the barrel section shell 1, so that a plurality of barrel section shells 1 can be welded and connected subsequently.

The exemplary "U" shaped deep groove 101 has a depth dimension of 4.35mm and a width of 8 arc lengths.

Wherein, the U-shaped deep groove 101 is positioned at the middle part of the sunken groove 102, and the U-shaped deep groove 101 and the sunken groove 102 are equal in length.

Therefore, through the combination of rough cutting with high feed and finish machining with low feed, the machining efficiency is improved, and the deformation of the shell of the barrel section caused by overlarge feed is avoided.

Specifically, in step 2, the method includes:

s5, placing the cylinder section shells 1 on a welding platform, and adjusting coaxiality of the cylinder section shells 1;

s6, welding and forming a plurality of cylinder section shells 1;

and S7, machining the allowance of the two ends of each barrel section shell 1 to ensure that the sinking grooves 102 and the U-shaped deep grooves 101 of the adjacent barrel section shells 1 are communicated to obtain a finished barrel.

In S7, when the recess 102 is formed in the end portion of the cylindrical shell 1, the processing method of step S402 is adopted.

After the sinking groove 102 of the end margin of the cylindrical segment case 1 is processed, the "U" shaped deep groove 101 is processed, and the processing method adopts step S403.

The parameters in step S403 need to be modified, so that after the "U" shaped deep groove 101 is finished, a machining allowance of 0.2-0.3mm is provided at the "U" shaped deep groove 101, thereby reducing the deformation risk of the barrel section shell 1.

Finally, the machining allowance is machined in a manual polishing mode, so that the U-shaped deep grooves 101 of all the barrel section shells 1 are communicated, and finally a finished barrel is obtained.

Compared with the prior art, the invention firstly processes each cylinder section shell 1 independently, and then combines and forms a plurality of cylinder section shells 1 in a welding mode, wherein when the cylinder section shells 1 are processed, the cylinder section shells are processed by using the standard of the inner circle end surfaces of the cylinder section shells 1, so that the situation that the matched parts cannot be placed due to deviation of the inner circle ends of the cylinder section shells 1 is avoided, and the matched parts can enter and exit the cylinder without clamping stagnation is realized.

Through carrying out the preliminary treatment to the outer terminal surface of section of thick bamboo casing 1 to the axiality and the straightness accuracy of the interior outer terminal surface of section of thick bamboo casing 1 are adjusted, are adjusted section of thick bamboo casing 1 wall thickness's homogeneity, and then ensure the homogeneity of follow-up processing "U" type deep groove 101 department wall thickness, and this avoids leading to the supporting part unable smooth and easy barrel that washes out because of "U" type deep groove 101 thickness is inhomogeneous.

The two ends of the cylinder section shell 1 are respectively attached and sleeved on the coaxial steps of the cover plate 3 and the chuck 2, so that the end part of the cylinder section shell 1 is rounded through the coaxial steps, the deformation of the cylinder section shell is avoided, the annular rib 103 is supported through the connection between the pull rod 4 and the annular rib 103 inside the cylinder section shell 1, the inner wall of the cylinder section shell 1 is further supported, and the deformation risk of the cylinder section shell 1 is further reduced.

In addition, the inner circle end of the cylinder section shell 1 is used for pushing type placement of matched parts, the inner circle end of the cylinder section shell 1 is used as a centering reference surface, the problem that the matched parts cannot be placed due to deviation of the inner circle end of the cylinder section shell 1 is avoided, and the cylinder body with no clamping stagnation of the matched parts is realized.

The method comprises the steps of machining a sinking groove 102 and a U-shaped deep groove 101 in a rough machining mode, wherein in the semi-finishing process, a machining area section with the length of 20-40mm is used as a single machining unit, before machining of one machining area section, the wall thickness of the area section is detected by a wall thickness meter, the cutting deviation in rough machining is determined, the cutting quantity of the semi-finishing is adjusted based on the cutting deviation in rough machining so as to carry out differential compensation on the rough machining, in the finishing process, the wall thickness of the machining area section with the length of 20-40mm is used as a single machining unit, before machining of one machining area section, the wall thickness of the area section is detected by the wall thickness meter, the cutting deviation in semi-finishing is determined, the cutting quantity of the finishing is adjusted based on the cutting deviation in semi-finishing so as to carry out differential compensation on the semi-finishing, and the problem that the cutting quantity is uneven due to deformation of a barrel section shell 1 during rough machining and semi-finishing is solved.

The jacking piece 6 sleeved on one pull rod 4 is filled in the rib notch 104 and attached to the inner wall of the barrel section shell 1, so that the position to be processed of the U-shaped deep groove 101 is supported, and the risk of deformation of the U-shaped deep groove processing part on the barrel section shell 1 is further reduced.

Example 1

A preparation method of a large thin-wall cylinder body comprises the following steps:

Specifically, the method comprises the following steps:

S1011, installing the chuck 2 on a turning and milling composite machining center, and respectively screwing one ends of four pull rods 4 into installation holes on the chuck 2;

wherein the centre line of the chuck 2 is located on a horizontal plane, i.e. the chuck 2 is mounted vertically.

S1012, one end of the barrel section shell 1 is attached and sleeved on the coaxial step of the chuck 2;

Specifically, in the horizontal direction, the section shell 1 passes through four pull rods 4 until one end of the section shell 1 is fitted and sleeved on the coaxial step of the chuck 2, and in the process, the annular rib 103 in the section shell 2 is abutted with the pull rods 4 so as to support the section shell 1, so that the cover plate 3 is convenient to install subsequently.

Wherein the outer diameter of the coaxial step on the chuck 2 is 0.2mm smaller than the inner diameter of the opening at one end of the barrel section shell 1.

S1013, inserting the coaxial step of the cover plate 3 into the other end of the barrel section shell 1, and at the moment, fitting and sleeving the other end of the barrel section shell 1 on the coaxial step of the cover plate 3;

The other ends of the four pull rods 4 respectively penetrate through corresponding mounting holes in the cover plate 3 and leak outside the cover plate 3 so as to reserve a nut mounting position.

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

S1014, utilizing the cooperation of nuts and pull rods 4 to squeeze the chucks 2 and the cover plates 3 at two ends of the barrel section shell 1, and clamping and fixing the barrel section shell 1;

specifically, the chuck 2 corresponds to the mounting holes formed in the cover plate 3 one by one, and the diameter of the pull rod 4 is slightly smaller than the aperture of the mounting hole in the cover plate 3, so that one end of the pull rod 4 passes through the mounting hole in the cover plate 3.

One end of the pull rod 4 passes through the mounting hole of the cover plate 3 and is positioned outside the cover plate 3, the part is matched with the nut, when the nut is screwed in, the cover plate 3 is extruded by the nut, and finally, the chuck 2 and the cover plate 3 are extruded at two ends of the barrel section shell 1 so as to clamp and fix the barrel section shell 1.

Wherein the screw-in distances of nuts at the end parts of the four pull rods 4 are the same.

The clamping force of the cover plate 3 and the chuck 2 on the barrel section shell 1 can be adjusted by controlling the screwing distance of the nuts, and the clamping force can enable the barrel section shell 1 to be static relative to the cover plate 3 and the chuck 2 in the machining process.

The four pull rods 4 are respectively abutted against the annular ribs 103 inside the barrel section shell 1 so as to support the annular ribs 103, further support the inner wall of the barrel section shell 1, and reduce the deformation risk of the barrel section shell 1.

When the shell 1 of the barrel section is clamped by using the auxiliary tool, the center line of the chuck 2 and the center line of the cover plate 3 are overlapped.

S1015, four limiting plates 5 are respectively arranged on the outer cambered surfaces of the chuck 2 and the cover plate 3, and the cartridge section shell 1 is limited in the diameter direction of the cartridge section shell 1.

Specifically, four limiting plates 5 are uniformly arranged on the cover plate 3, and the limiting plates 5 are arranged on the cover plate 3 through screws.

Four limiting plates 5 are uniformly arranged on the chuck 2, and the limiting plates 5 are arranged on the chuck 2 through screws.

Wherein the limiting plates 5 on the cover plate 3 and the chuck 2 are distributed in a staggered way.

S102, taking the inner circular end face of one end of the cylinder section shell 1 as a reference surface, and adjusting the straightness and the axial lead position of the outer end face of the cylinder section shell 1.

Specifically, the method comprises the following steps:

s1021, determining a machining reference surface;

S1022, rough machining is carried out on the outer end face of the cylinder section shell 1, and the machining allowance is 2mm;

The wall thickness of the cartridge segment housing 1 is required to be 7.8mm, that is to say, the wall thickness of the cartridge segment housing 1 is 9.8mm at this time, so that the rigidity of the cartridge segment housing 1 is ensured, and the deformation risk of the cartridge segment housing 1 is reduced.

Wherein, the coaxiality of the inner end surface and the outer end surface of the finished barrel section shell 1 is 0.05, and the straightness is 0.12.

Before the outer end face of the barrel section shell 1 is machined, the inside of the barrel section shell 1 is a machined molding face, namely corresponding parts can be placed in an adaptive mode in the barrel section shell 1.

S2, aligning the barrel section shell 1, and determining the machining position of the U-shaped groove 101 on the barrel section shell 1;

Specifically, the method comprises the following steps:

s201, determining a horizontal plane datum line and a symmetrical plane datum line of the cylinder section shell 1;

Specifically, the cylinder section shell 1 is placed on a rotary table, the inner circle of the cylinder section shell 1 is aligned, and a horizontal plane datum line and a symmetrical plane datum line of the cylinder section shell are drawn to serve as the subsequent milling alignment foundation of the cylinder section shell 1.

The milling machine comprises the steps of removing an auxiliary tool, transferring the barrel section shell 1 to a milling machine, and milling the annular rib 103 at the corresponding position on the inner cavity of the barrel section shell 1 based on the determined machining position of the two U-shaped deep grooves 101 on the barrel section shell 1 to obtain the barrel section shell 1 with the inner annular rib 103 provided with a notch so as to avoid affecting the punching of parts inside the barrel body.

The width of the annular rib notch 104 is the same as the width of the U-shaped deep groove 101.

Wherein the annular ribs 103 in the barrel section shell 1 are punched out in a milling mode.

S4, machining a U-shaped deep groove 101 on the outer end surface of the barrel section shell 1;

Specifically, the method comprises the following steps:

Wherein, the rest 2 pull rods 4 avoid the positions of the annular rib notches 104 and respectively abut against the annular ribs 103 in the barrel section shell 1.

S402, machining a sinking groove 102 on the barrel section shell 1 based on the position to be machined of the U-shaped deep groove 101;

Specifically, the method comprises the following steps:

S4021, rough machining of a sinking groove;

wherein, the processing cutter is an end mill with the diameter of 12mm, and the rotating speed S3500r/min and the feeding F1500mm/min are adopted in the rough cutting.

Wherein, in the diameter direction of section of a tube casing 1, rough machining total cutting volume is 2mm, divide 4 times feed, and feed along section of a tube casing 1 axial once in place at every turn to improve machining efficiency.

S4022, semi-finishing the sinking groove 102 on the basis of rough machining;

In the axial direction of the cylinder section shell 1, a machining area section with the length of 30mm is used as a single machining unit, a wall thickness gauge is used for thickness detection, and difference compensation is carried out on rough machining in a mode of substituting a difference value, so that the problem that the cutting amount is uneven due to deformation of the cylinder section shell 1 during rough machining is solved.

Wherein the total cut of the roughing is 2mm and the remaining wall thickness at the undercut groove 102 is, in theory, L-2=7.8-2=5.8 mm, wherein L is the wall thickness value of the barrel section housing 1.

Wherein the theoretical total cutting amount in semi-finishing is 0.4mm, and 7 times of feeding are performed.

Before machining, the wall thickness value of the machined area section is detected by using a wall thickness meter and is compared with 5.8mm to obtain the absolute value of the difference value of 5.8mm, and at the moment, if the wall thickness value of the machined area section is smaller than 5.8mm, the actual total cutting quantity of the machined area section is 0.4-absolute value of the difference value.

If the wall thickness value of the processing area section is larger than 5.8mm, the actual total cutting quantity of the processing area section is 0.4+ absolute value of the difference value.

Wherein, during semi-finishing, the rotating speed S1500r/min, the feeding F500mm/min and the processing cutter are end milling cutters with phi 12 mm.

And S4023, carrying out finish machining on the sunken groove 102 on the basis of semi-finish machining.

Wherein, in section of thick bamboo casing 1 axial direction to the processing area section of 30mm length is single processing unit, utilizes the wall thickness appearance to carry out thickness detection to carry out the difference compensation to semi-finishing with substituting the mode of difference, when overcoming semi-finishing, section of thick bamboo casing 1 produces the deformation and leads to the inhomogeneous problem of cutting volume.

Specifically, before machining a machining area section, the wall thickness of the area section is detected by a wall thickness gauge, cutting deviation in semi-finishing is determined, and the cutting amount of finishing is adjusted based on the cutting deviation in semi-finishing so as to perform differential compensation on the semi-finishing.

Wherein the sum of the total cutting power of the rough machining and the semi-finishing is 2+0.4=2.4 mm, and the residual wall thickness at the depressed groove 102 is L-2.4=7.8-2.4=5.4 mm theoretically, wherein L is the wall thickness value of the shell 1 of the barrel section.

Wherein, the theoretical total cutting amount in finish machining is 0.3mm, and the cutting is carried out for 6 times.

Before machining, the wall thickness value of the machining area section is detected by using a wall thickness meter and is compared with 5.4mm to obtain the absolute value of the difference value of 5.4mm, and at the moment, if the wall thickness value of the machining area section is smaller than 5.4mm, the actual total cutting quantity of the machining area section is 0.3-absolute value of the difference value.

If the wall thickness value of the processing area section is larger than 5.4mm, the actual total cutting quantity of the processing area section is 0.3+ absolute value of the difference value.

Wherein, during finish machining, the rotating speed S1500r/min, the feeding F500mm/min and the machining tool are end mills with phi 12 mm.

At this time, the depth dimension of the undercut 102 was 2.7 (0, +0.15) mm and the width was 40 arc lengths.

S403, machining the U-shaped deep groove 101 in the sinking groove 102 based on the determined position to be machined of the U-shaped deep groove 101.

Specifically, the method comprises the following steps:

s4031, determining the machining depth of the U-shaped deep groove 101;

H=L-M-E

Wherein L is the wall thickness of the shell 1 of the barrel section;

m is the depth of the undercut 102;

E is the thickness of the U-shaped deep groove 101.

Specifically, l=7.8 mm, m=2.7 mm, e=0.75 mm, at which time h=7.8-2.7-0.75=4.35 mm.

Wherein the width of the U-shaped deep groove 101 is 8 arc lengths.

S4032, roughly machining a U-shaped deep groove 101;

wherein, the processing cutter is a ball end milling cutter with the diameter of phi 8mm, and when in rough cutting, the rotating speed is S2500r/min, and the feeding speed is F1200mm/min.

S4033, semi-finishing the U-shaped deep groove 101 on the basis of rough machining;

Wherein the total cutting amount of the rough machining is 2mm, and the residual wall thickness at the "U" shaped deep groove 101 is L-2.7-2=7.8-2.7-2=3.1 mm in theory, wherein L is the wall thickness value of the barrel section shell 1.

Wherein the theoretical total cutting amount in semi-finishing is 2.1mm, and 7 times of feeding are performed.

Before machining, the wall thickness value of the machining area section is detected by using a wall thickness meter and is compared with 3.1mm to obtain the absolute value of the difference value with 3.1mm, and at the moment, if the wall thickness value of the machining area section is smaller than 3.1mm, the actual total cutting quantity of the machining area section is 2.1-the absolute value of the difference value.

If the wall thickness value of the processing area section is larger than 3.1mm, the actual total cutting quantity of the processing area section is 2.1+ difference absolute value.

The semi-finishing process is performed at the rotating speed S1500r/min, the feeding F300mm/min and the processing cutter is a ball end milling cutter with the diameter of 8 mm.

S4034, carrying out finish machining on the U-shaped deep groove 101 on the basis of semi-finish machining.

Wherein the sum of the total cutting amounts of the rough machining and the semi-finishing is 2+2.1=4.1 mm, and the residual wall thickness at the "U" shaped deep groove 101 is L-2.7-4.1=7.8-2.7-4.1=1 mm in theory, wherein L is the wall thickness value of the shell 1 of the barrel section.

Wherein, the theoretical total cutting amount in finish machining is 0.25mm, and the cutting is carried out for 6 times.

Before machining, detecting the wall thickness value of the machining area section by using a wall thickness meter, comparing the wall thickness value with 1mm, and obtaining the absolute value of the difference value with 1mm, wherein at the moment, if the wall thickness value of the machining area section is smaller than 1mm, the actual total cutting quantity of the machining area section is 0.25-absolute value of the difference value.

If the wall thickness value of the processing area section is larger than 1mm, the actual total cutting quantity of the processing area section is 0.25+ absolute value of the difference value.

Wherein, during finish machining, the rotating speed S1500r/min, the feeding F300mm/min and the machining tool are ball end mills with phi 8 mm.

At this time, the depth dimension of the "U" shaped deep groove 101 is 4.35mm, the width is 8 arc length, and the "U" shaped deep groove 101 is located in the middle of the depressed groove 102.

Wherein the U-shaped deep groove 101 and the sinking groove 102 are equal in length.

And 2, obtaining a plurality of barrel section shells 1 based on the steps 1 to 4, and welding and forming the barrel section shells 1 to obtain the barrel.

Specifically, the method comprises the following steps:

Wherein the cartridge segment housings 1 are adjusted such that the "U" shaped deep grooves of adjacent cartridge segment housings 1 are aligned.

Wherein the number of cartridge segment housings 1 is 5.

S6, welding and forming a plurality of cylinder section shells 1;

After the multiple barrel section shells 1 are welded and formed, the open ends of the adjacent barrel section shells 1 are connected, and at this time, the U-shaped deep grooves 101 on all the barrel section shells 1 are aligned.

As shown in fig. 10, the positions to be processed after the welding molding include a, b, c, d, e, f.

When the recess 102 is formed in the end portion of the cylindrical shell 1, the processing method of step S402 is adopted.

The machining method comprises the steps of machining a sinking groove 102 of the end allowance of a barrel section shell 1, and then machining a U-shaped deep groove 101, wherein in the machining method, in the step S403, the theoretical total cutting amount of rough machining, semi-finishing and finish machining is 2mm, 1.9mm and 0.15mm respectively, at the moment, the residual theoretical wall thickness of the U-shaped deep groove 101 is 1.05mm, the machining allowance is 0.3mm, and finally, machining the machining allowance of 0.3mm in a manual polishing mode to finally obtain a finished barrel.

After the barrel section shell 1 is welded and formed, an existing three-jaw chuck clamping and supporting mode is adopted to support openings at two ends.

Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program to instruct associated hardware, where the program may be stored on a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.

Claims

1. The preparation method of the large thin-wall cylinder is characterized by comprising the following steps:

In the semi-finishing and finishing processes, a machining area section with the length of 20-40mm is taken as a single machining unit;

The step 1 comprises the following steps:

s4, machining a U-shaped deep groove on the outer end surface of the barrel section shell;

The step S4 comprises the following steps:

2. The method according to claim 1, wherein the step 2 comprises:

s6, welding and forming a plurality of cylinder section shells;

3. The method according to claim 1, wherein S1 comprises:

4. The method of claim 3, wherein the auxiliary tool comprises a chuck, a cover plate and a plurality of pull rods, the chuck and the cover plate are arranged at two ends of the shell of the barrel section during clamping, and the two ends of the pull rods are respectively connected with the chuck and the cover plate and are used for tightly pressing the chuck and the cover plate at openings at two ends of the shell of the barrel section.

5. The method of claim 4, wherein the chuck and the cover plate are provided with coaxial steps, and the coaxial steps on the chuck and the cover plate are respectively inserted into openings at two ends of the shell of the barrel section to support the openings at the ends of the shell of the barrel section during clamping.

6. The method of claim 4, wherein a plurality of groups of mounting holes are correspondingly formed on the chuck and the cover plate, so that the mounting position of the pull rod can be adjusted through the mounting holes;

7. The method of claim 5, further comprising a top holder comprising a fixed portion and a support portion, wherein the fixed portion is configured to fit over the pull rod and slidingly engage the pull rod;

8. The method of claim 1, wherein during the semi-finishing process, a machining area section with the length of 20-40mm is taken as a single machining unit, the cutting amount of the semi-finishing process is adjusted based on the cutting deviation during the rough machining, and the rough machining is subjected to differential compensation;