CN115178625A - Method for manufacturing guide pipe sample - Google Patents

Method for manufacturing guide pipe sample Download PDF

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Publication number
CN115178625A
CN115178625A CN202210804816.4A CN202210804816A CN115178625A CN 115178625 A CN115178625 A CN 115178625A CN 202210804816 A CN202210804816 A CN 202210804816A CN 115178625 A CN115178625 A CN 115178625A
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CN
China
Prior art keywords
manufacturing
conduit
sample
entity
catheter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210804816.4A
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Chinese (zh)
Inventor
李慧敏
周军
胡雅玲
常伟
朱顺畅
江淑莺
龚桂秀
陈超
文松涛
李瑞玲
刘洋
胡宏菲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangxi Hongdu Aviation Industry Group Co Ltd
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Jiangxi Hongdu Aviation Industry Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Jiangxi Hongdu Aviation Industry Group Co Ltd filed Critical Jiangxi Hongdu Aviation Industry Group Co Ltd
Priority to CN202210804816.4A priority Critical patent/CN115178625A/en
Publication of CN115178625A publication Critical patent/CN115178625A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

The invention discloses a method for manufacturing a conduit sample, which comprises the following steps: creating a three-dimensional model of the catheter; constructing a solid process model on the basis of the three-dimensional model of the conduit; manufacturing an entity in an additive mode on the basis of the entity process model; selecting a sample tube with a corresponding size to bend along the center line of the solid by taking the qualified solid as a basis to obtain an initial shape real sample; measuring the prototype by using a measuring device, comparing the measured data with the entity process model, and manually correcting to be qualified to obtain a conduit prototype based on the entity process model; and manually bending and forming the conduit blank by taking the conduit full sample as reference, checking by using a special tool manufactured according to the three-dimensional model of the conduit, analyzing and searching reasons if the two dimensions are not coordinated, and repeating the steps until qualified parts meeting the process requirements or technical requirements are formed by manually bending and forming the conduit full sample. The invention greatly shortens the production period, saves the time for preparing the real sample and improves the sampling precision.

Description

Method for manufacturing guide pipe sample
Technical Field
The invention belongs to the field of aviation manufacturing, and particularly relates to manufacturing of an aviation metal conduit sample, which is particularly suitable for manufacturing of a metal conduit which is based on a model and cannot be subjected to numerical control bending forming.
Background
Catheters are important parts of aircraft and engines, and function and importance are similar to human blood vessels. Due to the complexity of the aircraft structure, many conduits for hydraulic, fuel, environmental, oxygen, etc. systems in the engine and aircraft interior are complex in layout, shape and orientation. Although digitalization in the design stage is realized at present, a large number of three-dimensional design technologies are adopted, and full-digital geometric information transmission in the manufacturing process is basically realized, compared with the traditional mode of taking a real sample on a machine after the assembly of an airplane, and the manufacture of a guide pipe formed by bending according to the real sample is greatly improved, a certain amount of guide pipes still exist, because the clamping distance of a numerical control bending process mould cannot be met by two adjacent bent middle straight-line sections and end processing straight-line sections of the guide pipe, or the numerical control bending process is inconvenient to replace the mould when the same guide pipe has a plurality of bends and the bending radius is different, or the guide pipe and a numerical control interference pipe bender in the numerical control bending process cannot be directly manufactured by digital processing.
Taking an airplane conduit as an example, the traditional conduit manufacturing usually adopts a mode of 'sampling before production', the mutual positions of a sampled conduit sample, surrounding parts, finished parts, accessories and a fixed support are coordinated on an airplane, the positions of related system conduits and cables in an area are coordinated, workers usually select small-caliber aluminum pipes with the diameter of phi 6 or phi 8mm and the like to bend along the central line of the conduit trend, the small-caliber aluminum pipes are repeatedly compared, tested and corrected on site to prepare an initial-shaped sample, the trend and the gap of the initial-shaped sample are identified under the condition that other system conduits, cables, finished parts, accessories and the like which are mutually related with the sample are complete, the initial-shaped sample is continuously corrected and re-taken until the trial assembly is qualified, and the sampling work is completed. Therefore, the traditional sampling work needs to be carried out on the airplane, a lot of preparation work is carried out, manual operation is completely relied on, the workload of multiple installation and verification is large, the period is long, the cost is high, the production efficiency and the manufacturing precision are low, the production management of the guide pipe is greatly inconvenient due to the existence of the sampling link, and the development progress of the airplane is passively elongated.
Although the technical improvement and upgrading of the numerical control pipe bender or the purchase of a numerical control pipe bender with higher processing capability is a way, the complexity of the guide pipe still has the possibility that machine tool equipment cannot meet the use requirement, the number of the guide pipes which cannot be directly bent in a numerical control mode and cannot be designed and optimized is not large, and the cost of adopting the method is abnormally high. Therefore, the manual pipe bending mode adopted for the conduit which cannot be bent and formed in a numerical control mode is reasonable, and therefore the optimization of the conduit sampling is important.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for manufacturing a guide pipe full sample so as to solve the problem of low processing efficiency of chamfering of a side wall orifice of a deep-cavity part.
The technical scheme of the invention is as follows:
a method of manufacturing a catheter sample, comprising the steps of:
step 1, establishing a catheter three-dimensional model;
step 2, constructing an entity process model on the basis of the three-dimensional model of the conduit;
step 3, manufacturing an entity in an additive mode on the basis of the entity process model;
step 4, measuring the entity, comparing the measured data with the entity process model, and re-manufacturing or manually correcting the process parameters which do not meet the process requirements or the technical requirements to be qualified according to the optimized process parameters in the step 2;
step 5, selecting sample tubes with corresponding sizes to bend along the center line of the trend of the entity according to the qualified entity to obtain a prototype entity;
step 6, measuring the prototype by using a measuring device, comparing the measured data with the entity process model, and manually correcting the prototype which does not meet the process requirement or the technical requirement until the prototype is qualified to obtain a conduit prototype based on the three-dimensional model;
and 7, manually bending and forming the conduit blank by taking the conduit full sample as a reference, checking by using a special tool manufactured according to the three-dimensional model of the conduit, analyzing and searching reasons if the conduit blank is not coordinated, and repeating the steps 1 to 6 until qualified parts are manually bent and formed according to the conduit full sample.
Further, the construction of the solid process model in the step 2 includes the process supplement design of the part geometry.
Further, the process complement design includes forming allowance and process filling for the part geometry.
Further, the manufacturing of the entity in the step 3 includes adjusting the placing position of the entity process model in the slicing processing software, setting the manufacturing speed, the layer height, the filling density, the temperature and other process parameters, selecting a proper adhesion platform mode and a proper support type, setting the additive manufacturing material type and the attribute, programming a numerical control program, manufacturing in a direct energy deposition or powder bed melting mode, and processing the entity with the appearance characteristics of the entity process model.
Further, the additive manufacturing material is polylactic acid (PLA).
Furthermore, the additive manufacturing temperature is 170-230 ℃, and the process parameter layer height is set to be half of the diameter of the nozzle.
Furthermore, in the step 5, an aluminum tube with the diameter of 6 multiplied by 1 or 8 multiplied by 1mm is selected as the sample tube.
Further, the measuring device in step 6 is a laser measuring machine.
Further, step 7 includes trimming the allowance after the pipe blank is bent and formed and the bending trend is corrected, wherein the trimming allowance includes removing the forming allowance, filling and opening.
The invention has the beneficial effects that:
1. the problems that the clamping distance of a die in a numerical control bending process cannot be met due to two adjacent bent middle straight line sections and an end processing straight line section of a guide pipe, or the die cannot be conveniently replaced in the numerical control bending process due to the fact that a plurality of guide pipes are bent and the bending radii are different, or the guide pipes and a numerical control pipe bender are interfered in the numerical control bending process, and the like, are solved;
2. the problems of time consumption, large workload and high cost of repeatedly sampling the catheter on site are solved;
3. the problem of low manufacturing precision caused by the fact that the traditional catheter sampling completely depends on manual control of the direction and the gap of the catheter is solved.
4. The production period is greatly shortened, the time for preparing the real sample is saved, and the sampling precision is improved.
Drawings
FIG. 1 is a flow chart of a method of manufacturing a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional model of a catheter in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of a physical process model according to a preferred embodiment of the present invention;
FIG. 4 is a schematic view of an additive manufacturing entity in a preferred embodiment of the invention;
FIG. 5 isbase:Sub>A cross-sectional view taken along A-A of FIG. 4;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4;
FIG. 7 is an enlarged view of a portion C of FIG. 5;
FIG. 8 is a schematic illustration of the slicing process in a preferred embodiment of the present invention;
FIG. 9 is a schematic view of a nozzle in accordance with a preferred embodiment of the present invention;
FIG. 10 is a schematic view of a catheter embodiment of the present invention;
FIG. 11 is a diagram illustrating data message delivery according to a preferred embodiment of the present invention;
in the figure: the three-dimensional model of the conduit comprises a three-dimensional model 1 of the conduit, a solid process model 2, a prototype 3, a solid 4, a nozzle 5, a conduit prototype 6, a hole 11, process filling 21, a forming allowance 22, a prototype central line 33, a support 41, a slice layer height 42 and a solid central line 43.
Detailed Description
The present invention will be further described with reference to the following examples, however, the scope of the present invention is not limited to the following examples.
Example 1: taking a certain aircraft conduit part as an example, a PLA material is selected, and the process of selectively extruding and selectively depositing the material through the nozzle 5 by using a heat source to melt the material is described as a method for manufacturing the conduit sample 6, and the flow of the manufacturing method is shown in fig. 1.
Fig. 2 shows a three-dimensional model 1 of a guide pipe, which has a complicated spatial trend and a hole 11, and the measurement of the model and the processing capability of a numerical control pipe bender show that the two adjacent middle straight-line sections and the end processing straight-line sections of the guide pipe cannot meet the clamping distance of a die in the numerical control bending process, so that manual bending is adopted, the manual bending needs a real sample, and the real sample is prepared according to the process flow of fig. 1.
The specific manufacturing method comprises the following steps:
step 1, creating a catheter three-dimensional model 1, as shown in figure 2;
step 2, constructing an entity process model 2 based on the three-dimensional conduit model 1, as shown in fig. 3, adding a forming allowance 22 to the three-dimensional conduit model 1 and performing a process supplementary design of process filling 21 to the upper hole 11 thereof according to the three-dimensional conduit model, a product design technical file, a process file (such as a handover state table, a part manufacturing scheme and the like), a use requirement of the process model and the like, thereby obtaining the entity process model 2 as a basis for subsequent design and manufacturing, wherein: the forming allowance 22 extends along the direction of the central line of the conduit, the forming allowance 22 is used for meeting the forming requirement of the conduit, prolonging the force arm, increasing the moment, avoiding inconvenient clamping and difficult bending and facilitating the forming, the process filling is to fill the holes on the surface of the three-dimensional model conduit, the filling surface and the molded surface of the part are in continuous and smooth transition, and the subsequent bending forming is facilitated;
step 3, pre-processing the solid process model 2 by taking the solid process model 2 as a basis and combining the trend of a guide pipe, the manufacturing quality and the efficiency, adjusting the placing position of the solid process model 2 in slice processing software, setting the manufacturing speed, the slice layer height 42, the filling density, the temperature and other process parameters, selecting a proper adhesion platform mode and a proper support 41 type, setting the type and the attribute of an additive manufacturing material, compiling a numerical control program, selectively extruding and manufacturing the additive manufacturing material through a nozzle 5 by adopting a heat source melting material and a selective deposition mode, and processing the solid 4 with the appearance characteristics of the solid process model 2 as the basis of subsequent manufacturing; preferably, the additive manufacturing process is as shown in fig. 4-10, preferably, the additive manufacturing material is polylactic acid (PLA) with good performance, environmental friendliness and low cost, the processing temperature is 170-230 ℃, and in order to ensure the manufacturing accuracy and efficiency, the slice layer height 42h is set to be half of the diameter d of the nozzle 5 according to experience, namely h =1/2d;
step 4, the manufactured entity 4 is measured after the support 41 is removed, the measured data is compared with the entity process model 2, the optimized process parameters which do not meet the process requirements or the technical requirements are manufactured again or corrected manually, and the qualified entity 4 is used as the basis for manufacturing the conduit real sample 6 subsequently;
step 5, based on the manufactured qualified entity 4, bending the small-caliber aluminum pipes with phi 6 multiplied by 1 or phi 8 multiplied by 1mm and the like along the center line 43 of the direction of the entity 4 to obtain a prototype 33, wherein the center line 33 of the prototype 33 is in accordance with the direction requirement of the center line 43 of the entity 4;
step 6, measuring the prototype sample 33 on a laser measuring machine, exporting the measured data, comparing the measured data with the entity process model 2, manually correcting the prototype sample which does not meet the process requirement or the technical requirement to be qualified to obtain a conduit sample 6 based on a three-dimensional model, as shown in figure 10, which is used for the production and the manufacture of subsequent conduit parts, and as shown in figure 11, the data information of the conduit sample 6 from the conduit three-dimensional model 1 is transmitted;
and 7, manually bending and forming a conduit blank by taking the conduit full sample 6 as a reference, checking by using a special tool manufactured by the three-dimensional conduit model 1, if the two dimensions are not coordinated, analyzing and searching reasons, and repeating the steps, wherein the steps are shown in the process flow of fig. 1 until qualified parts meeting the process requirements or technical requirements are manually bent and formed according to the conduit full sample 6.
Step 7 also includes trimming the remaining amount after the catheter blank is bent and shaped and the bending direction is corrected, wherein the trimming of the remaining amount includes removing the forming remaining amount 22, the process filling 21 and the opening 11 until the manufactured catheter conforms to the three-dimensional model of the catheter.
The invention solves the problem that the middle straight line segment is short and cannot meet the requirement of numerical control bending forming; the problems of time consumption, large workload and high cost of repeatedly sampling the catheter on site are solved; the problem of low manufacturing precision caused by the fact that the traditional catheter sampling completely depends on manual control of the direction and the gap of the catheter is solved. The method greatly shortens the production period, saves the time for preparing the real sample and improves the sampling precision.
While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (9)

1. A method of manufacturing a catheter sample, comprising the steps of:
step 1, establishing a catheter three-dimensional model;
step 2, constructing an entity process model on the basis of the three-dimensional model of the conduit;
3, manufacturing an entity in an additive mode on the basis of the entity process model;
step 4, measuring the entity, comparing the measured data with the entity process model, and re-manufacturing or manually correcting the process parameters which do not meet the process requirements or the technical requirements to be qualified according to the optimized process parameters in the step 2;
step 5, selecting a sample tube with a corresponding size to bend along the center line of the trend of the entity based on the qualified entity to obtain an initial-shaped real sample;
step 6, measuring the prototype by using a measuring device, comparing the measured data with the entity process model, and manually correcting the prototype which does not meet the process requirement or the technical requirement until the prototype is qualified to obtain a conduit prototype based on the three-dimensional model;
and 7, manually bending and forming the conduit blank by taking the conduit full sample as a reference, checking by using a special tool manufactured according to the three-dimensional model of the conduit, analyzing and searching reasons if the conduit blank is not coordinated, and repeating the steps 1 to 6 until qualified parts are manually bent and formed according to the conduit full sample.
2. A method of manufacturing a catheter master sample according to claim 1, wherein the building of the solid process model in step 2 comprises process-complementary design of the part geometry.
3. A method of manufacturing a catheter version as claimed in claim 2 wherein the process complementary design includes form allowance and process filling of the part geometry.
4. The method of claim 1, wherein the step 3 of manufacturing the solid body comprises adjusting the position of the solid process model in the slicing software, setting the manufacturing speed, layer height, packing density, temperature, etc., selecting a proper adhesion platform mode and support type, setting the additive manufacturing material type and properties, programming a numerical control program, manufacturing by direct energy deposition or powder bed melting, and processing the solid body with the appearance characteristics of the solid process model.
5. A method of manufacturing a catheter sample according to claim 4, wherein the additive manufacturing material is polylactic acid (PLA).
6. A method of manufacturing a real sample of a pipe as claimed in claim 4, wherein the additive manufacturing temperature is 170 to 230 ℃ and the process parameter layer height is set to be half the nozzle diameter.
7. A method of manufacturing a catheter version as claimed in claim 1 wherein in step 5 the sample tube is an aluminium tube of 6 x 1mm or 8 x 1mm diameter.
8. A method of manufacturing a catheter sample according to claim 1, wherein the measuring device in step 6 is a laser measuring machine.
9. A method of manufacturing a catheter version as claimed in claim 3 wherein step 7 further comprises trimming the blank after bending and straightening the bend, the trimming comprising removing the forming stock, process filling and aperturing.
CN202210804816.4A 2022-07-08 2022-07-08 Method for manufacturing guide pipe sample Pending CN115178625A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116861569A (en) * 2023-08-25 2023-10-10 北京星河动力装备科技有限公司 Rocket engine pipeline assembly and manufacturing method thereof

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CN103272901A (en) * 2013-06-17 2013-09-04 沈阳飞机工业（集团）有限公司 Method for taking and manufacturing guide tube real samples
CN105095605A (en) * 2015-09-15 2015-11-25 沈阳飞机工业（集团）有限公司 Simulation method of airplane conduit machining process
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CN111036901A (en) * 2019-12-10 2020-04-21 西安航天发动机有限公司 Selective laser melting forming method for multi-material part
US20200353569A1 (en) * 2017-10-30 2020-11-12 Cutwork B.V. An elongate profile, an assembly comprising the elongate profile and a method for producing the elongate profile
CN112395708A (en) * 2020-11-27 2021-02-23 北京宇航***工程研究所 Pipeline digital reconstruction method based on accurate measurement

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Publication number Priority date Publication date Assignee Title
CN103272901A (en) * 2013-06-17 2013-09-04 沈阳飞机工业（集团）有限公司 Method for taking and manufacturing guide tube real samples
CN113068457B (en) * 2014-12-24 2017-07-28 中国人民解放军第五七二0工厂 Rapid and accurate digital manufacturing method for aviation conduit
CN105095605A (en) * 2015-09-15 2015-11-25 沈阳飞机工业（集团）有限公司 Simulation method of airplane conduit machining process
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CN110874503A (en) * 2019-11-22 2020-03-10 中国航发控制***研究所 Rapid development method for aero-engine control system product
CN111036901A (en) * 2019-12-10 2020-04-21 西安航天发动机有限公司 Selective laser melting forming method for multi-material part
CN112395708A (en) * 2020-11-27 2021-02-23 北京宇航***工程研究所 Pipeline digital reconstruction method based on accurate measurement

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CN116861569A (en) * 2023-08-25 2023-10-10 北京星河动力装备科技有限公司 Rocket engine pipeline assembly and manufacturing method thereof

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