CN103884306A - Test method for researching wall thickness of large-caliber hot extrusion forming tee joint - Google Patents
Test method for researching wall thickness of large-caliber hot extrusion forming tee joint Download PDFInfo
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- CN103884306A CN103884306A CN201410112212.9A CN201410112212A CN103884306A CN 103884306 A CN103884306 A CN 103884306A CN 201410112212 A CN201410112212 A CN 201410112212A CN 103884306 A CN103884306 A CN 103884306A
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Abstract
The invention provides a test method for researching wall thickness of a large-caliber hot extrusion forming tee joint. The method includes the steps that an actually produced hot extrusion forming tee joint pipe fitting is measured, the change of the wall thickness at different positions is summarized according to the characteristics of the hot extrusion forming process of the pipe fitting, a section CAD drawing of sections of different angles of the tee joint is determined, and then a wall thickness database of the large-caliber hot extrusion forming tee joint is built. The method effectively solves the problems that the wall thickness of the hot extrusion forming tee joint is complex in distribution and can not be measured, so that engineering calculation and corresponding computer simulation and prediction burst pressure calculation are difficult to conduct.
Description
Technical field
The invention belongs to tube wall thickness assessment and calculate studying technological domain, particularly a kind of method of testing of studying heavy caliber hot extrusion molding threeway wall thickness.
Background technology
In long oil and gas pipeline engineering construction, the needs such as, break-in point defeated in order to meet, metering, the site operations such as field, valve chamber and compressor station of stand usually need a large amount of large-caliber pipe fittings such as elbow, threeway products.For hot extrusion molding tee pipe fitting, due to its arm and the arc transition structure of supervisor's root uniqueness, make the structural strength of threeway depend on consumingly arm and supervisor's root radius of curvature R and shoulder wall thickness t equidimension.ANSI B16.9 pipeline standard has proposed a series of requirement to the size of duct element.Be mainly that external diameter, the wall thickness of threeway end and the size of threeway bevel for welding that supervisor's length, the tee branch of threeway are positioned to supervisor's height threeway more than center line proposed specific requirement, but do not do requirement for size and the global shape of master, arm transition position.The relevant specification of China's petrochemical industry has also been continued to use above regulation substantially.In fact, different manufacturers, various processes and the each position of the same specification hot extrusion molding threeway physical dimension of producing by different moulds incomplete same, especially the radius-of-curvature of wall thickness and primary branch transition position, and these two parameters all have considerable influence to the intensity of pipe fitting.So the wall thickness to heavy caliber hot extrusion threeway is measured and is summed up, and finds its Changing Pattern, set up the wall thickness data of actual hot extrusion molding threeway different parts, quality supervision and the control of heavy caliber hot extrusion threeway are had great importance.
Existing documents and materials show that also not having truly to reflect about specification is definite method and the technical indicator of the isometrical and each position of reducing hot extrusion molding threeway wall thickness more than Φ 900mm.Only have with the result of Φ 356mm × 55mm welding high pressure equal tee burst pressure and the comparison of actual burst pressure result.This kind of equal tee is welding Highpressure Tee, and each wall thickness dimension of its threeway is more 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 data of hot extrusion molding threeway key position according to three-way pipe radius wall thickness Changing Pattern.With solve the wall thickness dimension of hot extrusion molding threeway different and analyze after theoretical value and measured value differ greatly and the problem that can not apply.
Summary of the invention
The object of the present invention is to provide a kind of method of testing of studying heavy caliber hot extrusion molding threeway wall thickness, to set up threeway each several part wall thickness critical size data, be convenient to carry out the computer simulation in later stage and relevant pipe fitting performance prediction analysis.
For solving the problems of the technologies described above, the invention provides a kind of method of testing of studying heavy caliber hot extrusion molding threeway wall thickness, comprise the steps:
(1) be 0 ° of cross section take the longitudinal cross-section by threeway axial line at a tube end for described threeway, draw the section outline curve in 0 ° of cross section, then determine that around described tube axis line rotation the longitudinal cross-section of other angles also draws respectively the section outline curve of respective cross-section;
(2), take described arm pipe end girth joint place as initial point, on the section outline curve in described 0 ° of cross section, point length mark such as interval goes out a series of measuring points;
(3) cut the section outline curve in described 0 ° of cross section according to the section exterior contour in 0 ° of cross section of threeway with cardboard, then on paper, record the section outline curve in 0 ° of cross section that described cardboard cuts and mark corresponding described each measuring point, use GetData software to set up rectangular coordinate system to determine the coordinate figure of described each measuring point, by in described each measuring point coordinate figure input AutoCAD, connect the section outer contour in 0 ° of cross section of described each measuring point generation;
(4) measure the pipe thickness of each measuring point on the section outline curve in 0 ° of cross section of described threeway, then on the section outer contour in 0 ° of cross section in described AutoCAD, on described each measuring point, draw successively and the tangential direction line segment vertical and that equate with the described each measuring point pipe thickness recording of the section outer contour in described 0 ° of cross section, connect the section inner outline in 0 ° of cross section of other end dot generation of described each line segment;
(5) the section CAD that can obtain 0 ° of cross section of described threeway by the section outer contour in described 0 ° of cross section and described inner outline schemes, the length of the each line segment in the section CAD in described 0 ° of cross section figure between outer contour and inner outline is the threeway wall thickness at each measuring point place on 0 ° of cross section, changes the wall thickness change in 0 ° of cross section of known described threeway according to the line segment length between the outer contour of described each measuring point and inner outline;
(6) the section CAD that obtains respectively as stated above again the cross section of described other angles of threeway schemes, each line segment length in the section CAD of described other angle cross section of threeway figure between outer contour and inner outline is the threeway wall thickness at each measuring point place on respective angles cross section, changes the wall thickness change in the cross section of known described threeway respective angles according to the line segment length between outer contour and the inner outline of each measuring point on respective angles cross section.
Further, described in the described longitudinal cross-section of determining other angles, other angles comprise 15 °, 30 °, 45 °, 60 °, 75 ° and 90 °.
Further, the length of described decile length is 20mm.
The method of testing of research 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 hot extrusion molding threeway wall thickness change rule, the section CAD in the cross section by obtaining the multiple special angle of threeway schemes the wall thickness change situation of known hot extrusion molding threeway, thereby obtains characterizing the rule of hot extrusion molding threeway wall thickness change.Having made up ANSIB16.9 pipeline standard does not have the deficiency of specific requirement for the size of threeway master, arm transition position and global shape.And the method for research threeway wall thickness provided by the invention, for the sample of different-thickness, do not need to change jig, work efficiency is high, test error is little, can measure quickly and easily the incomplete same physical dimension in the each position of same specification hot extrusion molding threeway that different manufacturers, various processes and different mould are produced.
Accompanying drawing explanation
In the method for testing of the research heavy caliber hot extrusion molding threeway wall thickness that Fig. 1 provides for the embodiment of the present invention, measure the schematic diagram in cross section.
The 0 ° of sectional drawing generating in the method for testing of the research heavy caliber hot extrusion molding threeway wall thickness that Fig. 2 provides for the embodiment of the present invention.
30 ° of sectional drawings that generate in the method for testing of the research heavy caliber hot extrusion molding threeway wall thickness that Fig. 3 provides for the embodiment of the present invention.
45 ° of sectional drawings that generate in the method for testing of the research heavy caliber hot extrusion molding threeway wall thickness that Fig. 4 provides for the embodiment of the present invention.
60 ° of sectional drawings that generate in the method for testing of the research heavy caliber hot extrusion molding threeway wall thickness that Fig. 5 provides for the embodiment of the present invention.
90 ° of sectional drawings that generate in the method for testing of the research heavy caliber hot extrusion molding threeway wall thickness that Fig. 6 provides for the embodiment of the present invention.
Hot extrusion molding threeway physical dimension schematic diagram in the method for testing of the research heavy caliber hot extrusion molding threeway wall thickness that Fig. 7 provides for the embodiment of the present invention.
Embodiment
A kind of method of testing of studying heavy caliber hot extrusion molding threeway wall thickness that the embodiment of the present invention provides, comprises the steps:
(1) be 0 ° of cross section take the longitudinal cross-section by threeway axial line at a tube end for threeway, draw the section outline curve in 0 ° of cross section, then determine that around a tube axis line rotation longitudinal cross-section of other angles also draws respectively the section outline curve of respective cross-section;
(2), take arm pipe end girth joint place as initial point, on the section outline curve in 0 ° of cross section, point length mark such as interval goes out a series of measuring points;
(3) cut the section outline curve in 0 ° of cross section according to the section exterior contour in 0 ° of cross section of threeway with cardboard, then on paper, record the section outline curve in 0 ° of cross section that cardboard cuts and mark corresponding each measuring point, use GetData software to set up rectangular coordinate system to determine the coordinate figure of each measuring point, by in each measuring point coordinate figure input AutoCAD, connect the section outer contour in 0 ° of cross section of each measuring point generation;
(4) pipe thickness of each measuring point on the section outline curve in measurement 0 ° of cross section of threeway, then on the section outer contour in 0 ° of cross section in AutoCAD, on each measuring point, draw successively and the tangential direction line segment vertical and that equate with the each measuring point pipe thickness recording of the section outer contour in 0 ° of cross section, connect the section inner outline in 0 ° of cross section of other end dot generation of each line segment;
(5) the section CAD that can obtain 0 ° of cross section of threeway by the section outer contour in 0 ° of cross section and inner outline schemes, the length of the each line segment in the section CAD figure in 0 ° of cross section between outer contour and inner outline is the threeway wall thickness at each measuring point place on 0 ° of cross section, changes the wall thickness change in 0 ° of cross section of known threeway according to the line segment length between the outer contour of each measuring point and inner outline;
(6) the section CAD that obtains respectively as stated above again the cross section of other angles of threeway schemes, each line segment length in the section CAD of other angle cross section of threeway figure between outer contour and inner outline is the threeway wall thickness at each measuring point place on respective angles cross section, changes the wall thickness change in the cross section of known threeway respective angles according to the line segment length between outer contour and the inner outline of each measuring point on respective angles cross section.
Wherein, determine that other angles in the longitudinal cross-section of other angles comprise 15 °, 30 °, 45 °, 60 °, 75 ° and 90 °.
Wherein, the length of decile length is 20mm.
Take DN1200 × 900 model hot extrusion molding threeway as example, the method for testing of research heavy caliber hot extrusion molding threeway wall thickness provided by the invention is elaborated below, wherein, the C=889mm of DN1200 × 900 model hot extrusion molding threeway, M=787mm.
Referring to Fig. 1, a tube end in threeway is 0 ° of cross section take the longitudinal cross-section by threeway axial line, draw the section outline curve in 0 ° of cross section, then turn clockwise around a tube axis line for threeway, select respectively again the angle of 30 °, 45 °, 60 ° and 90 ° to determine other longitudinal cross-sections, and draw respectively the section outline curve in 30 °, 45 °, 60 ° and 90 ° cross sections.
Describe as an example of the section outer contour in 0 ° of cross section by threeway axial line longitudinal cross-section and the generation method of section inner outline example.The section outer contour in 0 ° of cross section and the generation step of section inner outline are: take the arm pipe end girth joint place of threeway as initial point, on the section outline curve in 0 ° of cross section of threeway, at interval of measuring point of pitch mark of 20mm, remember a series of measuring points at the section outline curve subscript in 0 ° of cross section like this; Copy the exterior contour of 0 ° of section of threeway with cardboard, cut the section outline curve in 0 ° of cross section, then on paper, record the section outline curve in 0 ° of cross section that cardboard cuts, and mark and each measuring point corresponding on the section outline curve in 0 ° of cross section of threeway, then use GetData software to set up rectangular coordinate system to determine the coordinate figure of each measuring point, again by each measuring point coordinate figure input AutoCAD, connect each measuring point and can generate the section outer contour in 0 ° of cross section.
Then measure the pipe thickness of each measuring point on the section outline curve in 0 ° of cross section of threeway, again on the section outer contour in 0 ° of cross section in AutoCAD, on each measuring point, draw successively and the tangential direction line segment vertical and that equate with the each measuring point pipe thickness recording of the section outer contour in 0 ° of cross section, another end points that connects each line segment can generate the section inner outline in 0 ° of cross section.
After the section inner outline in 0 ° of cross section and outer contour generate, can obtain the section CAD figure in 0 ° of cross section of threeway.The section CAD in 0 ° of cross section of model hot extrusion molding threeway, DN1200 × 900 schemes as shown in Figure 2, because the length of the each line segment between outer contour and inner outline in the section CAD figure in 0 ° of cross section is the threeway wall thickness at each measuring point place on 0 ° of cross section, therefore change according to the line segment length between the outer contour of each measuring point and inner outline the wall thickness change that can know 0 ° of cross section of threeway.
Adopt with the section CAD that obtains 0 ° of cross section and scheme identical method, can obtain respectively 30 ° of threeways, 45 °, the section CAD figure in 60 ° and 90 ° cross sections, 30 ° of DN1200 × 900 model hot extrusion molding threeway, 45 °, the section CAD figure in 60 ° and 90 ° cross sections, respectively as Fig. 3, Fig. 4, shown in Fig. 5 and Fig. 6, due to 30 ° of threeways, 45 °, each line segment length in the section CAD figure in the cross section of 60 ° and 90 ° between outer contour and inner outline is the threeway wall thickness at each measuring point place on respective angles cross section, therefore can know 30 ° of threeways according to the length variations of the line segment between each measuring point place's outer contour and inner outline on respective angles cross section, 45 °, the wall thickness change of 60 ° and 90 ° sections.
By the section CAD figure in the above-mentioned several special angle of model hot extrusion molding threeway cross section, DN1200 × 900, according to the length variations of the line segment between each measuring point place's outer contour and inner outline in the section CAD figure of each angle cross section, can analyze the Thickness Distribution Variation Features that draws hot extrusion molding threeway, thereby obtain characterizing the characteristic dimension of hot extrusion molding threeway wall thickness.Referring to Fig. 7, C is the half of threeway supervisor length, and M is that arm is positioned at height more than supervisor's center line, D
0for threeway supervisor's external diameter, d
0for the external diameter of tee branch, R is the radius-of-curvature of the shoulder transition position of supervisor and arm.Because the chamfering curvature of inside and outside outline line in the section CAD figure in 0 ° and 90 ° cross section is the inside and outside interface curvature of primary branch, therefore, in the section CAD figure in 0 ° and 90 ° cross section, the chamfering radius-of-curvature of inside and outside outline line is respectively to be determined by the mean value of every section of arc radius of inside and outside outline line, obtains the radius of curvature R value of the shoulder transition position of threeway supervisor and arm.And according to the section CAD figure end wall thickness dimension in 0 ° of cross section, obtain the gauge t of threeway supervisor end
1; According to the section CAD figure both side ends wall thickness dimension in 90 ° of cross sections, obtain the gauge t of tee branch end
2gauge t with supervisor bottom
3.
Because the starting material of hot extrusion molding threeway are steel plates, the thickness of whole threeway all changes near steel plate pipe thickness, and threeway bottom is owing to not passing through drawing and extrusion process, its bottom thickness is approximately the pipe thickness T of threeway, the gauge t of the threeway supervisor bottom therefore, obtaining by this method of testing
3, be approximately the pipe thickness T of threeway, can be used as a characteristic dimension of threeway.Hot extrusion molding threeway supervisor section thickness is from supervisor bottom and increases gradually to being responsible for end thickness, in threeway dimensional measurement from now on, can be responsible for threeway the gauge t of end
1for a characteristic dimension of threeway; For a tube end section thickness, should select the thickness t of a tube end
2as a characteristic dimension of threeway.Hot extrusion molding threeway is of a size of its shoulder chamfer radius (i.e. 0 ° of Chamfer Curve position) the most especially, shoulder chamfer radius is along with producer, mould, caliber, the difference of technique and difference, therefore shoulder chamfer radius R is the size that hot extrusion molding threeway has feature most, therefore select another characteristic dimension that shoulder chamfer radius R is threeway.To sum up analyze, for hot extrusion molding threeway from now on, can be with pipe thickness T, supervisor end thickness t
1, arm end thickness t
2r is characteristic dimension with threeway shoulder chamfer radius.
Can find out that from the section CAD figure of each angle cross section threeway wall thickness change is larger, the thinnest position of threeway wall thickness is all at tee branch pipe end in general, and arm pipe end wall thickness is all less than pipe thickness T.After the general wall thickness of primary branch zone of transition increases, enters supervisor, variation in thickness is irregular.The heavv section of three-way tube wall of different model is generally 30 ° of sections; The thinnest section is generally 90 ° of sections, and approaches pipe thickness T.
The method of testing of research heavy caliber hot extrusion molding threeway wall thickness provided by the invention, the wall thickness of the hot extrusion molding tee pipe fitting based on actual production is measured, the tube wall thickness causing for its hot extrusion molding process characteristic is summarized at the Changing Pattern of different parts, by determining the section CAD figure in cross section of the multiple special angle of tee pipe fitting, set up the wall thickness dimension data of the privileged sites of heavy caliber hot extrusion molding threeway, thereby sum up the Thickness Distribution Variation Features of hot extrusion molding threeway, obtain characterizing the characteristic dimension of hot extrusion molding threeway wall thickness, can effectively determine the wall thickness of the hot extrusion molding threeway of wall thickness complex distributions, and be conducive to carry out the engineering calculation in later stage and the calculating of corresponding computer simulation prediction burst pressure.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (3)
1. a method of testing of studying heavy caliber hot extrusion molding threeway wall thickness, is characterized in that, comprises the steps:
(1) be 0 ° of cross section take the longitudinal cross-section by threeway axial line at a tube end for described threeway, draw the section outline curve in 0 ° of cross section, then determine that around described tube axis line rotation the longitudinal cross-section of other angles also draws respectively the section outline curve of respective cross-section;
(2), take described arm pipe end girth joint place as initial point, on the section outline curve in described 0 ° of cross section, point length mark such as interval goes out a series of measuring points;
(3) cut the section outline curve in described 0 ° of cross section according to the section exterior contour in 0 ° of cross section of threeway with cardboard, then on paper, record the section outline curve in 0 ° of cross section that described cardboard cuts and mark corresponding described each measuring point, use GetData software to set up rectangular coordinate system to determine the coordinate figure of described each measuring point, by in described each measuring point coordinate figure input AutoCAD, connect the section outer contour in 0 ° of cross section of described each measuring point generation;
(4) measure the pipe thickness of each measuring point on the section outline curve in 0 ° of cross section of described threeway, then on the section outer contour in 0 ° of cross section in described AutoCAD, on described each measuring point, draw successively and the tangential direction line segment vertical and that equate with the described each measuring point pipe thickness recording of the section outer contour in described 0 ° of cross section, connect the section inner outline in 0 ° of cross section of other end dot generation of described each line segment;
(5) the section CAD that can obtain 0 ° of cross section of described threeway by the section outer contour in described 0 ° of cross section and described inner outline schemes, the length of the each line segment in the section CAD in described 0 ° of cross section figure between outer contour and inner outline is the threeway wall thickness at each measuring point place on 0 ° of cross section, changes the wall thickness change in 0 ° of cross section of known described threeway according to the line segment length between the outer contour of described each measuring point and inner outline;
(6) the section CAD that obtains respectively as stated above again the cross section of described other angles of threeway schemes, each line segment length in the section CAD of described other angle cross section figure between outer contour and inner outline is the threeway wall thickness at each measuring point place on respective angles cross section, changes the wall thickness change in known described threeway respective angles cross section according to the line segment length between outer contour and the inner outline of each measuring point on respective angles cross section.
2. the method for testing of research heavy caliber hot extrusion molding threeway wall thickness according to claim 1, is characterized in that: described in the described longitudinal cross-section of determining other angles, other angles comprise 15 °, 30 °, 45 °, 60 °, 75 ° and 90 °.
3. the method for testing of research heavy caliber hot extrusion molding threeway wall thickness according to claim 1, is characterized in that: the length of described decile length is 20mm.
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| CN104780986A (en) * | 2014-07-15 | 2015-07-15 | 杨顺伟 | Measuring method for wall thickness of large-diameter extrusion-molding tee |
| CN105627851A (en) * | 2016-01-29 | 2016-06-01 | 王昌益 | New method for rock blasting deformation research |
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