CN104780986A - Measuring method for wall thickness of large-diameter extrusion-molding tee - Google Patents
Measuring method for wall thickness of large-diameter extrusion-molding tee Download PDFInfo
- Publication number
- CN104780986A CN104780986A CN201480002797.7A CN201480002797A CN104780986A CN 104780986 A CN104780986 A CN 104780986A CN 201480002797 A CN201480002797 A CN 201480002797A CN 104780986 A CN104780986 A CN 104780986A
- Authority
- CN
- China
- Prior art keywords
- section
- threeway
- wall thickness
- outline
- thickness
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a measuring method for the wall thickness of a large-diameter extrusion-molding tee. The measurement is based on tee pipe fittings formed by thermal extrusion in practical production, varying patterns of the wall thickness in different positions caused by the technical characteristics of thermal extrusion molding are summarized, the measuring method for measuring the thermal extrusion-molding tee is established, a wall thickness dimension database of the large-diameter thermal extrusion-molding tees is established, and the defect that engineering calculation and corresponding computer simulation prediction of bursting pressure calculation are not facilitated due to complicated distribution of the wall thickness dimensions of the thermal extrusion-molding tees is effectively overcome.
Description
Technical field
The invention belongs to tube wall thickness assessment and calculate studying technological domain, particularly a kind of measuring method of heavy caliber hot extrusion molding threeway wall thickness.
Background technology
In long-distance oil & gas pipeline engineering construction, in order to meet the needs such as point defeated, break-in, metering, the site operations such as field of standing, valve chamber and compressor station usually need the large-caliber pipe fittings products such as a large amount of elbows, threeway.For hot extrusion molding tee pipe fitting, due to its arm and the arc transition structure of supervisor's root uniqueness, the structural strength of threeway is made to depend on arm and supervisor's root radius of curvature R and shoulder wall thickness t equidimension consumingly.ANSIB16.9 pipeline specifications proposes the dimensional requirement of a series of duct element.The height that supervisor's length and arm are positioned at more than supervisor's center line is mainly comprised for threeway, and the wall thickness of external diameter and end and the size of bevel for welding, but for the size of master, arm transition position and global shape not requirement.The relevant specification of China's petrochemical industry has also continued to use above regulation substantially.In fact, different manufacturers, various processes and same specification hot extrusion molding threeway each position physical dimension of producing by different mould are also incomplete same, especially the radius of curvature of wall thickness and primary branch transition position, and the intensity of these two parameters to pipe fitting all has considerable influence.So effectively measure the critical size of heavy caliber hot extrusion threeway and sum up, find its Changing Pattern, set up the database of actual hot extrusion molding threeway size and error range, the quality surveillance of heavy caliber hot extrusion threeway and control are had great importance.
Existing documents and materials show also not have truly to reflect about specification to be relevant measurement method and the technical indicator of the isometrical of more than Φ 900mm and reducing hot extrusion molding threeway each position actual size.Only have and weld the result of high pressure equal tee burst pressure compared with actual burst pressure result with Φ 356mm × 55mm.This kind of equal tee is welding Highpressure Tee, and each wall thickness dimension of its threeway is comparatively even, can well predict.
Therefore need the moulding process feature according to hot extrusion threeway, on the basis of actual measurement hot extrusion molding threeway wall thickness change rule, set up the wall thickness database of the threeway key position of hot extrusion molding according to three-way pipe radius wall thickness Changing Pattern.And theoretical value analyze after and measured value different with the wall thickness dimension solving hot extrusion molding threeway differ greatly and can not carry out the problem applied.
Summary of the invention
The object of the present invention is to provide a kind of measuring method of heavy caliber hot extrusion molding threeway wall thickness, to set up threeway each several part wall thickness CD data storehouse, be convenient to computer simulation and the relevant pipe fitting performance prediction analysis of carrying out the later stage.
For solving the problems of the technologies described above, the invention provides a kind of measuring method of heavy caliber hot extrusion molding threeway wall thickness, comprising the steps:
(1) physical dimension of described threeway and thickness are simplified;
(2) at the tube end of described threeway to be 0 ° of cross section by the longitudinal cross-section of threeway axial line, then rotate and angularly determine other longitudinal cross-sections;
(3) with described arm pipe end girth joint place for initial point, the section outer contour in described cross section is pressed point outline line such as decile length;
(4) described section outline curve is cut with cardboard, be the pipe thickness that each measuring point on described section outline curve measured by a measuring point calibrator with described decile length, then paper using records the section outline curve that cardboard cuts, and outside contour curve marks each measuring point, GetData software is used to set up rectangular coordinate system and draw the coordinate value of each measuring point, by in each measuring point coordinate value input AutoCAD, connect each measuring point and generate section outer contour;
(5) draw after the pipe thickness point of the described each measuring point on described section outer contour being found intersection point by AutoCAD, connect each pipe thickness dot generation section inner outline;
(6) the section CAD that can obtain described threeway cross section by described inner outline and outer contour schemes; The section CAD that can obtain described other cross sections of threeway more as stated above schemes;
(7) scheme according to the section CAD in described threeway cross section, primary branch interface curvature can be determined, 0 °, 90 ° Chamfer Curve curvature are its primary branch interface curvature, and all the other angle primary branch interface curvature are by 0 °, the Chamfer Curve modeling of 90 °, is determined by the mean value of every section of arc radius.
Further, describedly angularly determine that angle described in other longitudinal cross-sections has 0 °, 15 °, 30 °, 45 °, 60 °, 75 °, 90 °.
Further, described is 20mm by the decile length in point outline curves such as decile length on section outline curve.
Further, the physical dimension of described threeway and thickness carry out simplification and comprise:
1) described threeway primary branch reduced outline is become the cylindrical of standard;
2) the arm end wall thickness of described threeway is reduced to uniform wall thickness, gets the mean value of surveyed wall thickness;
3) supervisor's section of described threeway is reduced to outline for circle, Internal periphery is oval;
4) the shoulder radii thickness method for simplifying of described threeway is: the thickness recorded by scene and outline draw all angles sectional drawing, measure chamfer radius inside and outside each section, uses during SolidWorks software modeling and automatically can set up change radius chamfering;
5) the primary branch pipe nipple of described threeway is reduced to the cylinder of standard;
6) the primary branch end socket of described threeway is reduced to the semiellipsoid of standard.
The measuring method of heavy caliber hot extrusion molding threeway wall thickness provided by the invention, according to the moulding process feature of hot extrusion threeway, on the basis of actual measurement hot extrusion molding threeway wall thickness change rule, set up the wall thickness database of hot extrusion molding threeway key position according to three-way pipe radius wall thickness Changing Pattern.Compensate for the deficiency that ANSIB16.9 pipeline specifications does not require for size and the global shape of threeway master, arm transition position.And measuring method of the present invention, for different-thickness sample, do not need to change jig, operating efficiency is high, test error is little, the physical dimension that each position of same specification hot extrusion molding threeway of different manufacturers, various processes and different mould production is incomplete same can be measured quickly and easily, be especially applicable to the radius of curvature measuring threeway different wall and threeway primary branch transition position
Accompanying drawing explanation
Schematic diagram in the measuring method of the heavy caliber hot extrusion molding threeway wall thickness that Fig. 1 provides for the embodiment of the present invention after the physical dimension of DN1200 × 900 model hot extrusion molding threeway and the simplification of thickness.
Thickness measure schematic cross-section in the measuring method of the heavy caliber hot extrusion molding threeway wall thickness that Fig. 2 provides for the embodiment of the present invention.
The 0 ° of sectional drawing generated in the measuring method of the heavy caliber hot extrusion molding threeway wall thickness that Fig. 3 provides for the embodiment of the present invention.
The 30 ° of sectional drawings generated in the measuring method of the heavy caliber hot extrusion molding threeway wall thickness that Fig. 4 provides for the embodiment of the present invention.
The 45 ° of sectional drawings generated in the measuring method of the heavy caliber hot extrusion molding threeway wall thickness that Fig. 5 provides for the embodiment of the present invention.
The 60 ° of sectional drawings generated in the measuring method of the heavy caliber hot extrusion molding threeway wall thickness that Fig. 6 provides for the embodiment of the present invention.
The 90 ° of sectional drawings generated in the measuring method of the heavy caliber hot extrusion molding threeway wall thickness that Fig. 7 provides for the embodiment of the present invention.
Detailed description of the invention
See Fig. 1, the measuring method of a kind of heavy caliber hot extrusion molding threeway wall thickness that the embodiment of the present invention provides, comprises the steps:
(1) physical dimension of threeway and thickness are simplified;
(2) at the tube end of threeway to be 0 ° of cross section by the longitudinal cross-section of threeway axial line, then rotate and angularly determine other longitudinal cross-sections;
(3) with arm pipe end girth joint place for initial point, the section outer contour in cross section is pressed point outline line such as decile length;
(4) section outline curve is cut with cardboard, be the pipe thickness that each measuring point on section outline curve measured by a measuring point calibrator with decile length, then paper using records the section outline curve that cardboard cuts, and outside contour curve marks each measuring point, GetData software is used to set up rectangular coordinate system and draw the coordinate value of each measuring point, by in each measuring point coordinate value input AutoCAD, connect each measuring point and generate section outer contour;
(5) draw after the pipe thickness point of each measuring point on section outer contour being found intersection point by AutoCAD, connect each pipe thickness dot generation section inner outline;
(6) the section CAD that can obtain threeway cross section by inner outline and outer contour schemes; The section CAD that can obtain other cross sections of threeway more as stated above schemes;
(7) scheme according to the section CAD in threeway cross section, primary branch interface curvature can be determined, 0 °, 90 ° Chamfer Curve curvature are its primary branch interface curvature, and all the other angle primary branch interface curvature are by 0 °, the Chamfer Curve modeling of 90 °, is determined by the mean value of every section of arc radius.
Wherein, angularly determine that the angle in other longitudinal cross-sections has 0 °, 15 °, 30 °, 45 °, 60 °, 75 °, 90 °.
Wherein, section outline curve divide the decile length in outline curve to be 20mm by decile length etc.
Wherein, the physical dimension of threeway and thickness carry out simplification and comprise:
1) threeway primary branch reduced outline is become the cylindrical of standard;
2) the arm end wall thickness of threeway is reduced to uniform wall thickness, gets the mean value of surveyed wall thickness;
3) supervisor's section of threeway is reduced to outline for circle, Internal periphery is oval;
4) the shoulder radii thickness method for simplifying of threeway is: the thickness recorded by scene and outline draw all angles sectional drawing, measure chamfer radius inside and outside each section, uses during SolidWorks software modeling and automatically can set up change radius chamfering;
5) the primary branch pipe nipple of threeway is reduced to the cylinder of standard;
6) the primary branch end socket of threeway is reduced to the semiellipsoid of standard.
Below for DN1200 × 900 model hot extrusion molding threeway, the measuring method of heavy caliber hot extrusion molding threeway wall thickness provided by the invention is described in detail, the C=889mm of DN1200 × 900 model hot extrusion molding threeway, M=787mm.
See Fig. 1, to the physical dimension of DN1200 × 900 model hot extrusion molding threeway and the simplification of thickness
(1) threeway primary branch reduced outline, due to the operation of bulge extruding in hot extrusion production technique, the profile of threeway primary branch can not be the cylindrical of very standard, therefore easy in order to model, the reduced outline of primary branch is become the cylindrical of standard.
(2) thickness of arm simplifies, and by the analysis of institute's Thickness Measurement by Microwave, arm end wall thickness is reduced to uniform wall thickness, gets the mean value of surveyed wall thickness.
(3) thickness be responsible for simplifies, and supervisor's end thickness is shown as up big and down small, and thickness is excessive gently from top to bottom, therefore supervisor end section is reduced to two non-concentric, and the inner circle center of circle is positioned at immediately below the cylindrical center of circle.The Thickness Analysis of threeway cross section position appropriate department is known, and the thickness being generally the left and right sides is maximum, and the thickness of bottom is minimum, therefore threeway cross section place supervisor's section is reduced to outline for circle, and Internal periphery is oval.
(4) simplification of shoulder radii thickness, the thickness recorded by scene and outline draw all angles sectional drawing, measure chamfer radius inside and outside each section, use during SolidWorks software modeling and automatically can set up change radius chamfering.
(5) simplification of primary branch pipe nipple, according to the thickness that scene is surveyed, the thickness of primary branch pipe nipple is even, therefore is reduced to the cylinder of standard.
(6) simplification of primary branch end socket, according to the thickness that scene is surveyed, the thickness of primary branch end socket is even, therefore is reduced to the semiellipsoid of standard.
See Fig. 2, at the tube end of threeway to be 0 ° of cross section by the longitudinal cross-section of threeway axial line, then turn clockwise, then select the angle of 15 °, 30 °, 45 °, 60 °, 75 °, 90 ° to determine other surveyed longitudinal cross-sections respectively.
See Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, listed section is respectively 0 °, 30 °, 45 °, 60 ° and 90 ° of sections being generated by actual measurement outer surface upper curve and respective thickness.The inner surface curve of each section and the generation step of section are: cut the upper outside contour curve of each cross-sectional face of threeway with cardboard, be the thickness that each point on outline curve measured by a measuring point sonigauge with every 20mm, subsequently cardboard profile paper using is copied down, and point out each measuring point, GetData software is used to set up rectangular coordinate system and draw the coordinate value of each measuring point, by in each measuring point coordinate value input AutoCAD, and each point smooth curve is connected, be outer contour; Draw in CAD after subsequently each dot thickness recorded with calibrator being found intersection point by AutoCAD, and connect with SPL spling, be inner outline.After inner outline and outer contour generate, the section of this angle can be obtained.According to DN1200 × 900 model hot extrusion molding threeway control section figure, 0 °, 90 ° of Chamfer Curve curvature are primary branch interface curvature, and all the other angle curve curvature are not primary branch interface curvature, therefore by 0 °, 90 ° of chamfering modelings.Chamfer radius is determined by the mean value of every section of arc radius.Try to achieve 0 ° of average outer chamfering radius of curvature, chamfering radius of curvature in average; 90 ° of average outer chamfering radius of curvature, chamfering radius of curvature in average.Supervisor's actual outside diameter, 0 ° of curve correspondence supervisor end thickness, supervisor bottom thickness, arm external diameter, actual M=787mm, C=889mm, the overall length between the end socket of supervisor two ends, a channel closure is to the distance at threeway center.The length of supervisor's end socket and the length of a channel closure.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. a measuring method for heavy caliber hot extrusion molding threeway wall thickness, is characterized in that, comprise the steps:
(1) physical dimension of described threeway and thickness are simplified;
(2) at the tube end of described threeway to be 0 ° of cross section by the longitudinal cross-section of threeway axial line, then rotate and angularly determine other longitudinal cross-sections;
(3) with described arm pipe end girth joint place for initial point, the section outer contour in described cross section is pressed point outline line such as decile length;
(4) described section outline curve is cut with cardboard, be the pipe thickness that each measuring point on described section outline curve measured by a measuring point calibrator with described decile length, then paper using records the section outline curve that cardboard cuts, and outside contour curve marks each measuring point, GetData software is used to set up rectangular coordinate system and draw the coordinate value of each measuring point, by in each measuring point coordinate value input AutoCAD, connect each measuring point and generate section outer contour;
(5) draw after the pipe thickness point of the described each measuring point on described section outer contour being found intersection point by AutoCAD, connect each pipe thickness dot generation section inner outline;
(6) the section CAD that can obtain described threeway cross section by described inner outline and outer contour schemes; The section CAD that can obtain described other cross sections of threeway more as stated above schemes;
(7) scheme according to the section CAD in described threeway cross section, primary branch interface curvature can be determined, 0 °, 90 ° Chamfer Curve curvature are its primary branch interface curvature, and all the other angle primary branch interface curvature are by 0 °, the Chamfer Curve modeling of 90 °, is determined by the mean value of every section of arc radius.
2. the measuring method of heavy caliber hot extrusion molding threeway wall thickness according to claim 1, is characterized in that: describedly angularly determine that angle described in other longitudinal cross-sections has 0 °, 15 °, 30 °, 45 °, 60 °, 75 °, 90 °.
3. the measuring method of heavy caliber hot extrusion molding threeway wall thickness according to claim 1, is characterized in that: described divides the decile length in outline curve to be 20mm by decile length etc. on section outline curve.
4. the measuring method of heavy caliber hot extrusion molding threeway wall thickness according to claim 1, is characterized in that: the physical dimension of described threeway and thickness carry out simplification and comprises:
1) described threeway primary branch reduced outline is become the cylindrical of standard;
2) the arm end wall thickness of described threeway is reduced to uniform wall thickness, gets the mean value of surveyed wall thickness;
3) supervisor's section of described threeway is reduced to outline for circle, Internal periphery is oval;
4) the shoulder radii thickness method for simplifying of described threeway is: the thickness recorded by scene and outline draw all angles sectional drawing, measure chamfer radius inside and outside each section, uses during SolidWorks software modeling and automatically can set up change radius chamfering;
5) the primary branch pipe nipple of described threeway is reduced to the cylinder of standard;
6) the primary branch end socket of described threeway is reduced to the semiellipsoid of standard.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2014/082242 WO2016008095A1 (en) | 2014-07-15 | 2014-07-15 | Method for measuring wall thickness of large-diameter hot extruded three-way pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104780986A true CN104780986A (en) | 2015-07-15 |
Family
ID=53621885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480002797.7A Pending CN104780986A (en) | 2014-07-15 | 2014-07-15 | Measuring method for wall thickness of large-diameter extrusion-molding tee |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104780986A (en) |
| WO (1) | WO2016008095A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996012912A1 (en) * | 1994-10-25 | 1996-05-02 | Wirsbo Rohrproduktion Und Vertriebs-Gmbh | Multiple pipe fitting |
| CN102039345A (en) * | 2009-10-19 | 2011-05-04 | 中国石油天然气集团公司 | Extrusion forming die for thick-wall butt welding tee joint and process for manufacturing tee joint |
| JP2011117823A (en) * | 2009-12-03 | 2011-06-16 | Tokyo Electric Power Co Inc:The | Device for measuring pipe wall thickness |
| CN103542214A (en) * | 2012-07-13 | 2014-01-29 | 中国石油天然气集团公司管材研究所 | Method for calculating wall thickness of large-aperture high-strength tee joints manufactured through hot drawing process for oil and gas delivery pipeline |
| CN103884306A (en) * | 2014-03-25 | 2014-06-25 | 中国石油天然气集团公司 | Test method for researching wall thickness of large-caliber hot extrusion forming tee joint |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202442669U (en) * | 2012-02-14 | 2012-09-19 | 中国石油天然气集团公司 | Positioning device for measuring circumferences or circumferential arc lengths of larger caliber steel pipes |
| CN202914952U (en) * | 2012-09-27 | 2013-05-01 | 嘉兴市杰希希管道工程有限公司 | Oil drill with tee joint |
| CN203231003U (en) * | 2013-04-18 | 2013-10-09 | 河北泽润高压管道管件有限公司 | Novel hot-extrusion tee joint for steam pipelines of 600 MW and 1000 MW ultra-supercritical generator sets |
-
2014
- 2014-07-15 WO PCT/CN2014/082242 patent/WO2016008095A1/en active Application Filing
- 2014-07-15 CN CN201480002797.7A patent/CN104780986A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996012912A1 (en) * | 1994-10-25 | 1996-05-02 | Wirsbo Rohrproduktion Und Vertriebs-Gmbh | Multiple pipe fitting |
| CN102039345A (en) * | 2009-10-19 | 2011-05-04 | 中国石油天然气集团公司 | Extrusion forming die for thick-wall butt welding tee joint and process for manufacturing tee joint |
| JP2011117823A (en) * | 2009-12-03 | 2011-06-16 | Tokyo Electric Power Co Inc:The | Device for measuring pipe wall thickness |
| CN103542214A (en) * | 2012-07-13 | 2014-01-29 | 中国石油天然气集团公司管材研究所 | Method for calculating wall thickness of large-aperture high-strength tee joints manufactured through hot drawing process for oil and gas delivery pipeline |
| CN103884306A (en) * | 2014-03-25 | 2014-06-25 | 中国石油天然气集团公司 | Test method for researching wall thickness of large-caliber hot extrusion forming tee joint |
Non-Patent Citations (1)
| Title |
|---|
| 吴宏等: "基于验证试验法的X80钢级大口径三通设计", 《油气储运》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016008095A1 (en) | 2016-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jiang et al. | A practical sampling method for profile measurement of complex blades | |
| CN106383955B (en) | Data interconversion method for stress analysis and three-dimensional model in pipeline design | |
| CN104216283B (en) | Rapid generation method of aircraft conduit processing files | |
| CN107273597B (en) | Design method of water distribution system of natural ventilation cooling tower | |
| CN110849291B (en) | Method for detecting bending radius of large-scale bent pipe | |
| US11253941B2 (en) | Predictive algorithm of welding distortion resultant from adding flanges to a butt weld or socket weld end of valve body casting | |
| CN103884306B (en) | A kind of testing method studying heavy caliber hot extrusion molding threeway wall thickness | |
| CN105855344A (en) | Forming method for small-radius bent pipes | |
| CN104475481A (en) | A variable corrugated pipe producing process and a product thereof | |
| CN104625648A (en) | Technological method for machining square and rectangular pipes | |
| CN103394881B (en) | A kind of hot extrusion three-way forming technique | |
| WO2022257322A1 (en) | Digital assembly and manufacturing method for flame exhaust pipe of servo mechanism | |
| CN104217084B (en) | The modeling method and device of a kind of heavy caliber hot extrusion molding threeway | |
| Fan et al. | Research on deformation characteristics of JCOE forming in large diameter welding pipe | |
| CN107407933A (en) | pipe network diagnostic device | |
| CN104780986A (en) | Measuring method for wall thickness of large-diameter extrusion-molding tee | |
| CN103542214A (en) | Method for calculating wall thickness of large-aperture high-strength tee joints manufactured through hot drawing process for oil and gas delivery pipeline | |
| CN105268761A (en) | Large-diameter thick-walled longitudinal submerged-arc welding pipe based on J-forming C-forming O-forming and Compression to make round (JCOC) forming process | |
| Yu et al. | Development of a cold stamping process for forming single-welded elbows | |
| CN111079306A (en) | Calculation method, system, device and storage medium for pipe fitting for pipeline connection | |
| CN103707054B (en) | A kind of Coordinated assembly method for three-docking-surfacseparating separating unit | |
| Zhang et al. | Mesh reconstruction technology of welding process in 3D FEM simulation of porthole extrusion and its application | |
| CN112025133A (en) | Mechanical processing track optimization method for variable-angle intersecting groove | |
| CN108345703A (en) | A kind of interior high-pressure molding method for optimization analysis and system based on CAE | |
| CN111774813A (en) | Method for manufacturing inner field of folding pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150715 |
|
| WD01 | Invention patent application deemed withdrawn after publication |