CN114378173B - Non-flaring molding manufacturing process for stainless steel conduit with working pressure of 28MPa - Google Patents
Non-flaring molding manufacturing process for stainless steel conduit with working pressure of 28MPa Download PDFInfo
- Publication number
- CN114378173B CN114378173B CN202111455608.XA CN202111455608A CN114378173B CN 114378173 B CN114378173 B CN 114378173B CN 202111455608 A CN202111455608 A CN 202111455608A CN 114378173 B CN114378173 B CN 114378173B
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- Prior art keywords
- pipe
- sleeve
- catheter
- pipe sleeve
- spinning
- 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.)
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 16
- 239000010935 stainless steel Substances 0.000 title claims abstract description 16
- 238000000465 moulding Methods 0.000 title claims abstract description 13
- 238000009987 spinning Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 3
- 239000010720 hydraulic oil Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
-
- 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
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Media Introduction/Drainage Providing Device (AREA)
- Metal Extraction Processes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to the field of hydraulic oil and cold air medium transmission channels of airplane hydraulic and cold air systems, in particular to a stainless steel conduit flaring-free molding manufacturing process with working pressure of 28MPa, which comprises the following specific steps: s1, cutting a pipe; s2, checking the appearance of the pipe sleeve; s3, mounting; s4, spinning; s5, checking the quality after spinning; the process of the invention directly determines the reliability of the connection between the pipe sleeve and the pipe body, the sealing performance of the pipe sleeve and the connection and processing performance of the pipe sleeve by strictly prescribing the outer diameter size of the non-flared pipe material with different pressures and the manufacturing parameters of internal rotation rolling forming torque between the pipe sleeve and the pipe body, thereby improving the connection strength of the pipe body and the pipe sleeve of the pipe; the adhesion degree of the inner wall of the pipe sleeve and the pipe body is increased, and the oil leakage and air leakage faults between the joint surfaces of the pipe sleeve and the pipe body are reduced; the qualification rate of the type of catheter processing and manufacturing is improved.
Description
Technical Field
The invention relates to the field of hydraulic oil and cold air medium transmission channels of airplane hydraulic and cold air systems, in particular to a non-flaring molding manufacturing process of a stainless steel conduit with working pressure of 28 MPa.
Background
The non-flaring conduit is widely applied to hydraulic and cold air systems of civil and military aircrafts and is used for pressure maintaining and transmission of working media. The application of the technology can effectively ensure the integrity of the equipment state.
The 28MPa pipe system adopts a flaring type sealing mode at present. Under the conditions of high vibration and high assembly stress, the pipe body of the guide pipe is easy to wear and break from the root of the flat pipe mouth to cause accidents, and a new structural form and a new technological method are needed to replace or iterate the traditional technological method at present so as to optimize the pipeline design.
In the technology for manufacturing the extrusion type flaring-free combined catheter end, the Chinese patent application number is 200710049224.1, and the flaring-free combined catheter end refers to a structure that a sleeve is connected to the catheter end in a sealing way. The extrusion forming technology of the non-flared conduit end uses a rubber sleeve expansion and assembly tool of a pull rod assembly to extrude the conduit wall of the conduit into a ring groove of a pipe sleeve, and technological parameters of a plurality of technological links such as forming, detecting, testing and the like, the technology improves the problems of frequent air leakage, large scrapping amount and short pressure maintaining time of the non-flared combined conduit, realizes the engineering application of the extrusion type non-flared combined conduit end manufacturing technology, but directly determines the reliability of connection of the pipe sleeve and the pipe body, the connection and the processing performance of the pipe sleeve and the sealing performance of the pipe sleeve and the like by manufacturing parameters such as the outer diameter size of non-flared conduit pipe materials with different pressures, internal rotation rolling forming torque between the pipe sleeve and the pipe body and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a flaring-free molding manufacturing process for a stainless steel conduit with working pressure of 28 MPa.
A stainless steel conduit flaring-free molding manufacturing process with working pressure of 28MPa comprises the following specific steps:
s1, cutting a pipe: the pipe diameter deformation of the guide pipe is prevented from generating ellipse, and the pipe end of the cut guide pipe is vertical to the radial center of the guide pipe;
s2, checking the appearance of the pipe sleeve; checking the surface of the pipe sleeve without burrs, scratches and abnormal machining marks; checking that the surface roughness of the sealing surface is not more than Ra0.4μm;
s3, mounting: selecting a corresponding expander, a clamping die and a positioning sleeve according to the specification of the catheter; installing and fixing the expander and the clamping die, installing the positioning sleeve at the end of the catheter, and fixing;
s4, spinning: setting equipment, starting spinning, and observing torque value change of special equipment for flaring-free internal rotation extrusion molding;
s5, quality inspection after spinning: checking and measuring the protruding sleeve part of the catheter, wherein the size of the protruding sleeve part is 1+/-0.5 mm; checking the rolled pipe sleeve root, wherein the pipe body of the pipe sleeve root is not allowed to have abnormal deformation; checking that the surfaces of the guide pipe and the pipe sleeve formed by spinning do not allow longitudinal and replacement nicks, scratches, burrs and cracks; the sleeve surface is not allowed to peel and scratch the coating caused by the relative movement of the outer clamping die.
The specific requirements of the step S1 cutting are as follows: the chamfer angle in deburring is recommended to be 45 degrees, and the thinning amount of the wall thickness of the guide pipe is not more than 1/3 after chamfering; measuring and controlling ellipticity and wall thickness of the end part of the catheter within a length range of 30mm after cutting the catheter; the tolerance of the outer diameter of the pipe isThe wall thickness tolerances of mm, phi 14 x 1.4, phi 18 x 1.8 are +.>mm，mm, ovality is not more than 0.05mm.
The pipe sleeve in the step S2 is made of stainless steel.
The torque value change in the step S4 is in accordance with the spinning torque ranges of phi 14 multiplied by 1.4 and phi 18 multiplied by 1, wherein the spinning torque ranges of phi 18 multiplied by 1.8 are 3.95-4.29 N.m, and the spinning torque ranges of phi 18 multiplied by 1.8 are 5.65-6.21 N.m.
The circumferential swelling part of the pipe body in the step S5 is uniformly swelled, and the pipe body is smoothly transited to a normal pipe body part; the allowable dimensional deviation of the outer diameter of the catheter at the position of 3+/-1 mm of the tail end of the measuring sleeve is measured, the dimensional deviation of the phi 14 mm catheter is 14.35-14.57 mm, and the dimensional deviation of the phi 18mm catheter is 18.35-18.57 mm.
The beneficial effects of the invention are as follows: the process of the invention directly determines the reliability of the connection between the pipe sleeve and the pipe body, the sealing performance of the pipe sleeve and the connection and processing performance of the pipe sleeve by strictly prescribing the outer diameter size of the non-flared pipe material with different pressures and the manufacturing parameters of internal rotation rolling forming torque between the pipe sleeve and the pipe body, thereby improving the connection strength of the pipe body and the pipe sleeve of the pipe; the adhesion degree of the inner wall of the pipe sleeve and the pipe body is increased, and the oil leakage and air leakage faults between the joint surfaces of the pipe sleeve and the pipe body are reduced; the qualification rate of the type of catheter processing and manufacturing is improved.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of a flare sleeve structure of the present invention.
Detailed Description
The present invention will be further described in the following to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the present invention easy to understand.
As shown in FIG. 1, the non-flaring molding manufacturing process of the stainless steel conduit with the working pressure of 28MPa comprises the following specific steps:
s1, cutting a pipe: the pipe diameter deformation of the guide pipe 2 is prevented from generating ellipse, and the pipe end of the cut guide pipe 2 is vertical to the radial center of the guide pipe 2;
s2, checking the appearance of the pipe sleeve 1; checking the surface of the pipe sleeve 1 to be free of burrs, scratches and abnormal machining marks; checking that the surface roughness of the sealing surface is not more than Ra0.4μm;
s3, mounting: selecting a corresponding expander, a clamping die and a positioning sleeve according to the specification of the catheter 2; the expander and the clamping die are installed and fixed, and the positioning sleeve is installed at the end head of the catheter 2 and fixed;
s4, spinning: setting equipment, starting spinning, and observing torque value change of special equipment for flaring-free internal rotation extrusion molding;
s5, quality inspection after spinning: the portion of the catheter 2 protruding from the sleeve 1 was inspected and measured to have a size of 1.+ -. 0.5mm; checking the root of the rolled pipe sleeve 1, wherein the pipe body at the root of the pipe sleeve 1 is not allowed to have abnormal deformation; checking that the surfaces of the guide tube 2 and the pipe sleeve 1 formed by spinning do not allow longitudinal and replacement scores, scratches, burrs and cracks; the surface of the pipe sleeve 1 is not allowed to be peeled off and scratched due to the relative movement of the outer clamping die.
The process of the invention directly determines the connection reliability of the pipe sleeve 1 and the pipe body and the sealing performance of the pipe sleeve 1 and the connection and processing performance of the pipe sleeve by strictly prescribing the outer diameter size of the pipe material of the non-flared pipe 2 with different pressures and the manufacturing parameters of internal rotation rolling forming torque between the pipe sleeve 1 and the pipe body, thereby improving the connection strength of the pipe body of the pipe 2 and the pipe sleeve; the adhesion degree of the inner wall of the pipe sleeve 1 and the pipe body is increased, and the oil leakage and air leakage faults between the joint surfaces of the pipe sleeve 1 and the pipe body are reduced; the qualification rate of the processing and manufacturing of the type of the conduit 2 is improved.
The specific requirements of the step S1 cutting are as follows: the chamfer angle in deburring is recommended to be 45 degrees, and the thickness reduction of the wall thickness of the guide pipe 2 is not more than 1/3 after chamfering; measuring and controlling ellipticity and wall thickness of the end part of the catheter 2 within a length range of 30mm after the catheter 2 is cut; the tolerance of the outer diameter of the pipe isThe wall thickness tolerances of mm, phi 14 x 1.4, phi 18 x 1.8 are +.>mm，mm, ovality is not more than 0.05mm.
The pipe sleeve 1 in the step S2 is made of stainless steel.
The conduit 2 in the step S3 is suitable for the material with the specification of 1Cr18Ni10Ti and comprises the following specifications: 14X 1.4, 18X 1.8.
The teeth of the sleeve 1 cut into the catheter 2 in step S4 must not be less than 0.08 and mm.
The torque value change in the step S4 is in accordance with the spinning torque ranges of phi 14 multiplied by 1.4 and phi 18 multiplied by 1, wherein the spinning torque ranges of phi 18 multiplied by 1.8 are 3.95-4.29 N.m, and the spinning torque ranges of phi 18 multiplied by 1.8 are 5.65-6.21 N.m.
The connection strength of the diameter phi 18 multiplied by 1.8 catheter 2 is not less than 49KN, and the connection strength of the diameter phi 14 multiplied by 1.4 catheter 2 is not less than 33KN.
The circumferential swelling part of the pipe body in the step S5 is uniformly swelled, and the pipe body is smoothly transited to a normal pipe body part; the outer diameter allowable dimensional deviation of the catheter 2 at the position 3+/-1 mm of the tail end of the sleeve 1 is measured, the dimensional deviation of the catheter 2 phi 14 mm is 14.35-14.57 mm, and the dimensional deviation of the catheter 2 phi 18mm is 18.35-18.57 mm.
The conduit 2 in the step S5 has no leakage and deformation under the hydraulic working state of 28 MPa.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A non-flaring molding manufacturing process of a stainless steel conduit with working pressure of 28MPa is characterized in that: the method comprises the following specific steps:
s1, cutting a pipe: the pipe diameter deformation of the guide pipe (2) is prevented from generating ellipse, and the pipe end of the cut guide pipe (2) is vertical to the radial center of the guide pipe (2);
s2, checking the appearance of the pipe sleeve (1); checking the surface of the pipe sleeve (1) to be free of burrs, scratches and abnormal machining marks; checking that the surface roughness of the sealing surface is not more than Ra0.4μm;
s3, mounting: selecting a corresponding expander, a clamping die and a positioning sleeve according to the specification of the catheter (2); installing and fixing the expander and the clamping die, installing the positioning sleeve at the end of the catheter (2), and fixing;
s4, spinning: setting equipment, starting spinning, and observing torque value change of special equipment for flaring-free internal rotation extrusion molding;
s5, quality inspection after spinning: checking and measuring the part of the catheter (2) protruding out of the sleeve (1), the size of which is 1+/-0.5 mm; checking the root of the rolled pipe sleeve (1), wherein the pipe body at the root of the pipe sleeve (1) is not allowed to deform abnormally; checking that the surfaces of the guide pipe (2) and the pipe sleeve (1) formed by spinning do not allow longitudinal and replacement nicks, scratches, burrs and cracks; the surface of the pipe sleeve (1) is not allowed to be peeled off and scratched by the plating layer caused by the relative movement of the outer clamping die;
the tolerance of the outer diameter of the pipe ismm，φ14×1.4、The wall thickness tolerances of φ18X1.8 are +.>mm，mm, ovality is not more than 0.05mm; the torque value change in the step S4 is in accordance with the spinning torque range of phi 14 multiplied by 1.4 and phi 18 multiplied by 1, wherein the spinning torque range of phi 18 multiplied by 1.8 is 3.95-4.29 N.m, and the spinning torque range of phi 18 multiplied by 1.8 is 5.65-6.21 N.m; in the step S5, the allowable dimensional deviation of the outer diameter of the catheter (2) at the position of 3+/-1 mm on the tail end of the sleeve (1) is measured, the dimensional deviation of the catheter (2) with phi 14 mm is 14.35-14.57 mm, and the dimensional deviation of the catheter (2) with phi 18mm is 18.35-18.57 mm.
2. The process for manufacturing the stainless steel conduit flawless molding under the working pressure of 28MPa according to claim 1, wherein the process is characterized in that: the specific requirements of the step S1 cutting are as follows: the chamfer angle at deburring is recommended to be 45 °.
3. The process for manufacturing the stainless steel conduit flawless molding under the working pressure of 28MPa according to claim 2, wherein the process is characterized in that: the wall thickness of the guide tube (2) should not be thinned by more than 1/3 after chamfering.
4. The process for manufacturing the stainless steel conduit flawless molding under the working pressure of 28MPa according to claim 1, wherein the process is characterized in that: the specific requirements of the step S1 cutting are as follows: and (3) measuring and controlling ellipticity and wall thickness of the end part of the catheter (2) within a length range of 30mm after the catheter (2) is cut.
5. The process for manufacturing the stainless steel conduit flawless molding under the working pressure of 28MPa according to claim 1, wherein the process is characterized in that: the pipe sleeve (1) in the step S2 is made of stainless steel.
6. The process for manufacturing the stainless steel conduit flawless molding under the working pressure of 28MPa according to claim 1, wherein the process is characterized in that: the circumferential swelling part of the pipe body in the step S5 is uniformly swelled, and the pipe body smoothly transits to the normal pipe body part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111455608.XA CN114378173B (en) | 2021-12-01 | 2021-12-01 | Non-flaring molding manufacturing process for stainless steel conduit with working pressure of 28MPa |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111455608.XA CN114378173B (en) | 2021-12-01 | 2021-12-01 | Non-flaring molding manufacturing process for stainless steel conduit with working pressure of 28MPa |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114378173A CN114378173A (en) | 2022-04-22 |
| CN114378173B true CN114378173B (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111455608.XA Active CN114378173B (en) | 2021-12-01 | 2021-12-01 | Non-flaring molding manufacturing process for stainless steel conduit with working pressure of 28MPa |
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| CN (1) | CN114378173B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB621908A (en) * | 1944-05-20 | 1949-04-22 | Parker Appliance Co | Improvements in or relating to couplings for tubes |
| CN101314173A (en) * | 2007-06-01 | 2008-12-03 | 成都飞机工业（集团）有限责任公司 | Manufacturing technique for extrusion pressing type non-enlarging combined pipe end socket |
| CN207298152U (en) * | 2017-09-29 | 2018-05-01 | 大连长之琳科技发展有限公司 | A kind of flareless pipeline connecting parts |
| CN108971364A (en) * | 2018-08-28 | 2018-12-11 | 航珍航空技术（上海）有限公司 | Flareless inward turning single lead screw ex truding briquetting machine and its expander |
| CN112793148A (en) * | 2020-12-17 | 2021-05-14 | 上海海鹰机械厂 | Taper sleeve type flaring-free guide pipe compression method |
| CN113404947A (en) * | 2021-07-28 | 2021-09-17 | 大连长之琳科技发展有限公司 | System pipeline based on rolling type combined guide pipe and assembling method thereof |
-
2021
- 2021-12-01 CN CN202111455608.XA patent/CN114378173B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB621908A (en) * | 1944-05-20 | 1949-04-22 | Parker Appliance Co | Improvements in or relating to couplings for tubes |
| CN101314173A (en) * | 2007-06-01 | 2008-12-03 | 成都飞机工业（集团）有限责任公司 | Manufacturing technique for extrusion pressing type non-enlarging combined pipe end socket |
| CN207298152U (en) * | 2017-09-29 | 2018-05-01 | 大连长之琳科技发展有限公司 | A kind of flareless pipeline connecting parts |
| CN108971364A (en) * | 2018-08-28 | 2018-12-11 | 航珍航空技术（上海）有限公司 | Flareless inward turning single lead screw ex truding briquetting machine and its expander |
| CN112793148A (en) * | 2020-12-17 | 2021-05-14 | 上海海鹰机械厂 | Taper sleeve type flaring-free guide pipe compression method |
| CN113404947A (en) * | 2021-07-28 | 2021-09-17 | 大连长之琳科技发展有限公司 | System pipeline based on rolling type combined guide pipe and assembling method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 导管端头加工零件结构与成形工艺;付冬雪;《黑龙江科技信息》(第17期);60页至61页 * |
| 无扩口导管预装成形技术;程纯娟;《洪都科技》(第3期);47-54页 * |
| 无扩口接头旋压成形工艺研究;付冬雪;《中国科技投资》(第9期);8-9页 * |
| 飞机液压无扩口管路连接工艺与性能研究;王洪洋汪永超;《自动化应用》(第8期);37页至39页 * |
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| CN114378173A (en) | 2022-04-22 |
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