CN107506506A - A kind of nipple thread gluing Risk Forecast Method based on finite element analysis - Google Patents
A kind of nipple thread gluing Risk Forecast Method based on finite element analysis Download PDFInfo
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- CN107506506A CN107506506A CN201610414645.9A CN201610414645A CN107506506A CN 107506506 A CN107506506 A CN 107506506A CN 201610414645 A CN201610414645 A CN 201610414645A CN 107506506 A CN107506506 A CN 107506506A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The present invention is a kind of nipple thread gluing Risk Forecast Method based on finite element analysis, comprising：Nipple dimensional parameters are determined by way of the mapping in kind of the part dimension or new designs of threaded joints that are indicated on screw joint product structural drawings；Nipple twist-on parameter is determined by the upper shackle actual tests of new designs of threaded joints；Calculated according to nipple dimensional parameters and twist-on parameter and twist-on length is detained on nipple；Contact stress is detained using finite element method and according on nipple dimensional parameters and twist-on parameter calculating nipple；Using twist-on length and Calculation of Contact Stress nipple thread gluing risk factors are detained on nipple, thread gluing risk size is judged.The present invention can realize the prediction of each several part thread gluing after button on nipple, diagnosis for product optimization design and thread gluing problem provides reference, product development cycle and cost are advantageously reduced, reduces product thread gluing risk, reduces all kinds of accidents occurred when product uses by thread gluing.
Description
Technical field
The present invention relates to the thread connection technology in petroleum engineering, refers in particular to a kind of screw thread based on finite element analysis
Joint thread gluing Risk Forecast Method.
Background technology
Tubing and casing is the special tubing in oil exploitation engineering, terminates the rear sleeve support borehole wall in drilling well, oil pipe is then by original
Oil and gas is transported to earth's surface, finally realizes oil-gas mining.During this between oil pipe and oil pipe and sleeve pipe and sleeve pipe
Between need by nipple realize connect.
Thread gluing is tubing and casing one of common failure mode in the production and use process.Its lighter damages thread surface,
The repeatedly upper shackle ability and torque wrench moment of product are influenceed, the sealing and bonding strength of tubing and casing can be reduced when serious, makes spiral shell
Leakage occurs for line joint or well accident of threading off, and influences work production and safety.
According to the definition of ISO13679 (2002) standard, thread gluing is that a kind of generation is cold between the metal surface to contact with each other
Weld (Cold welding).In tubing and casing in shackle process, the contact surface of the male and female screw thread of interaction is not ideal
It is smooth, but have certain roughness and form error.It is upper button be screwed into during contact surface corresponding to male and female screw thread all
It is to be contacted since partial points, is progressively transitioned into face contact.With above snapping through continuing for journey, surface roughness and form error etc.
Presence caused by contact uneven, this allows for different parts contact difference, and the pressure on localized contact point is very high, surpasses
The stress of steel matrix yield point is crossed, so as to produce plastic deformation in contact point.In plastic history, if thread surface does not have
Ruptured with the presence of coating, or coating in tangential motion, then part can occur for contact point both sides metal at normal temperatures
Recrystallization, diffusion or fusing etc. change, and are easily bonded between surface, thus produce cold welding phenomenon.Tubing and casing once occurs serious
Thread gluing phenomenon, it will drastically reduce the structural intergrity and sealing integrity of screw thread, ultimately result in that well is fallen in slippage and underground is let out
Leakage accident occurs.
It is very more to influence the factor of nipple thread gluing, wherein several influence factors main are as follows：
1st, flange, the burr of processing formation：It is existing inevitably to there is processing flange, burr etc. during screw thread process
As.These flange, burr are dealt with improperly can scratch thread surface so as to cause thread gluing in upper shackle process.
2nd, mismachining tolerance：Pitch, taper, tooth form etc. can all have certain error in joint process, these errors
So that stress distribution is uneven after joint twist-on, the possibility increase of thread gluing occurs for the excessive region of local stress.
3rd, thread surface processing quality is bad：Thread surface coating serves the effect of isolation and protection, avoids male and female
Threaded base directly contacts during upper button, therefore the quality of face coat bad can directly contribute thread gluing.
4th, torque wrench moment：Increased torque wrench moment acts on after nipple the contact stress being converted into inside joint.Turn round
Square is bigger, and contact stress also can be bigger, and the risk for producing thread gluing also can be higher.
It follows that in addition to the physical damnifications such as flange, burr, holiday, most Thread-sticking is all with contacting
Stress is relevant, therefore realizes that the risk anticipation of new designs of threaded joints thread gluing is feasible by the analysis to contact stress.
The content of the invention
A kind of the problem of the invention aims to overcome prior art to exist, there is provided screw thread based on finite element analysis
Joint thread gluing Risk Forecast Method, realize the thread gluing prediction of new designs of threaded joints.
The purpose of the present invention is achieved through the following technical solutions：
A kind of nipple thread gluing Risk Forecast Method based on finite element analysis, it is comprised the steps of：
S1, by way of the mapping in kind of the part dimension or new designs of threaded joints that are indicated on screw joint product structural drawings
Determine nipple dimensional parameters；
S2, nipple twist-on parameter is determined by the upper shackle actual tests of new designs of threaded joints；
S3, calculated according to the nipple dimensional parameters and twist-on parameter and twist-on length is detained on nipple；
S4, nipple is calculated using finite element method and according to the nipple dimensional parameters and twist-on parameter
Upper button contact stress；
S5, using twist-on length and Calculation of Contact Stress nipple thread gluing risk factors are detained on nipple, judge viscous
Detain risk size.
In the step S1, the nipple dimensional parameters include：The outer tube diameter D of nipple, wall thickness t, male end
Sealing surface diameter parameters dSealing surface pin, male end diameter of thread parameter dScrew thread pin, female end sealing surface diameter parameters dSealing surface box, female end screw thread
Diameter parameters dScrew thread box, male and female end sealing surface angle parameter theta, male and female end thread taper parameter γ and male and female end thread pitch
Parameter p；
In the step S2, the twist-on parameter includes：The upper button flex point torque T of nipple1, upper button flex point number of turns n1,
Final torque wrench moment T2, final upper buckle ring number n2。
The step S3 refers to the circular bead surface in nipple, and several calculating points are respectively selected on sealing surface and screw thread position,
Then each calculating point twist-on contact length is calculated respectively, and calculation procedure is as follows：
S31, calculates the relative displacement of nipple, and calculation formula is as follows：
d0=p* (n2-n1)
In formula：d0For the axially opposing displacement of nipple twist-on, each axially opposing displacement d of nipple twist-on for calculating point0
It is identical；
S32, calculates the screw thread of nipple and its contact magnitude of interference at sealing surface position, calculation formula are as follows：
δScrew thread=dScrew thread pin-dScrew thread box
δSealing surface=dSealing surface pin-dSealing surface box
In formula：δScrew threadTo be in the screw thread radial direction matching allowance that screw thread position calculates point, point is calculated in screw thread position
Screw thread radial direction matching allowance is identical；δSealing surfaceTo be in the sealing surface radial fit interference that nipple sealing surface position calculates point
Amount；
S33, calculate the screw thread, sealing surface and the axial displacement at circular bead surface position of nipple；
For screw thread position, male and female end screw thread is the angle relative motion defined with taper, its axial displacement, calculation formula
It is as follows：
wScrew thread=γ * δScrew thread/2+d0
W in formulaScrew threadThe screw thread that point is calculated to be in nipple screw thread position axially engages displacement, the screw thread position
It is identical that the screw thread of calculating point axially engages displacement；
For sealing surface position, male and female end in contact is that its axial displacement, calculation formula is such as with sealing surface angle relative motion
Under：
W in formulaSealing surfaceThe sealing surface that point is calculated to be in nipple sealing surface position axially engages displacement；
For circular bead surface position, male and female end in contact occurs after flex point appearance, and its axial displacement is：
wCircular bead surface=d0
W in formulaCircular bead surfaceThe sealing surface that point is calculated to be in nipple sealing surface position axially engages displacement；
S34, calculates the actual twist-on contact length of screw thread of nipple, and calculation formula is as follows：
L in formulaEiFor each corresponding actual twist-on contact length for calculating point；
W is relative displacement in formula, if being in the calculating point of nipple screw thread position, W=WScrew thread；If it is in spiral shell
The calculating point of line joint sealing face position, then W=WSealing surface；If it is in the calculating point at nipple circular bead surface position, W=
WCircular bead surface；
R in formulaiFor each corresponding radius for calculating nipple pipe portion position residing for point, wherein i is each numbering for calculating point, right
For oil sleeve joint, each position radius riChange is little, takes ri=D/2, then above-mentioned LEiCalculation formula be：
The step S4 includes：
S41, built based on the obtained nipple relative displacement relation of the obtained nipple dimensional parameters of step S1 and S31
Vertical nipple FEM model；
S42, the nipple twist-on parameter and step S31 that are obtained according to step S2 actually detain the displacement relation bar of twist-on
Part, boundary condition is added, boundary condition mainly includes material property, axial symmetry characteristic, contact performance etc., attached in calculating process
It is added in computation model；
S43, complete finite element analysis and calculating；
S44, extraction and analysis result, obtain the contact stress σ of each calculating point contact positioniNumerical value, wherein i is each calculating
The numbering of point.
In the step S5, each corresponding actual twist-on contact length L for calculating point of nipple is utilizedEiWith contact site
Contact stress σi, nipple thread gluing risk factors are calculated, judge thread gluing risk size, formula is as follows：
Fzi=σi*LEi
In formula, FziFor each corresponding thread gluing risk factors for calculating point, wherein i is each numbering for calculating point.
Beneficial effects of the present invention：
A kind of nipple thread gluing Risk Forecast Method based on finite element analysis of the present invention, it is possible to achieve nipple
The prediction of each several part thread gluing after upper button, the diagnosis for product optimization design and thread gluing problem provide reference, advantageously reduce product
Construction cycle and cost, by this method and by structure optimization, product thread gluing risk is reduced, is reduced when product uses because viscous
All kinds of accidents of garnishment life.
To further illustrate above-mentioned purpose, design feature and the effect of the present invention, the present invention is entered below with reference to accompanying drawing
Row describes in detail.
Brief description of the drawings
Fig. 1 is the nipple thread gluing Risk Forecast Method schematic flow sheet of the invention based on finite element analysis；
Fig. 2 is the schematic diagram of implication shown in male end thread parameter in nipple of the present invention；
Fig. 3 is the schematic diagram of implication shown in female end thread parameter in nipple of the present invention；
Fig. 4 is that twist-on curve synoptic diagram is detained on nipple of the present invention；
Fig. 5 is to calculate the schematic diagram chosen when twist-on length is detained on nipple of the present invention and calculate point；
Fig. 6 is nipple contact stress analysis result figure of the present invention.
Embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing of embodiment.
The present invention by the analysis and calculating to thread parameter, it is determined that during upper button each contact site of nipple twist
Connect contact length；Then finite element method is utilized, determines the contact stress of the corresponding site after the completion of nipple twist-on；
Compare the size for determining thread gluing risk finally by the twist-on contact length and contact stress that determine position.
Referring to Fig. 1, the nipple thread gluing Risk Forecast Method of the invention based on finite element analysis comprises the steps of：
S1, by way of the mapping in kind of the part dimension or new designs of threaded joints that are indicated on screw joint product structural drawings
Determine nipple dimensional parameters；
S2, nipple twist-on parameter is determined by the upper shackle actual tests of new designs of threaded joints；
S3, calculated according to the nipple dimensional parameters and twist-on parameter and twist-on length is detained on nipple；
S4, nipple is calculated using finite element method and according to the nipple dimensional parameters and twist-on parameter
Upper button contact stress；
S5, using twist-on length and Calculation of Contact Stress nipple thread gluing risk factors are detained on nipple, judge viscous
Detain risk size.
Lower mask body is as an example.
A nipple is chosen as analysis object, carries out thread gluing risk profile.
In the step S1, material object is surveyed and drawn according to the part dimension indicated on product structure drawing or by instrument
Etc. each dimensional parameters that mode determines screw-thread joint structure, referring to Fig. 2-Fig. 3, the nipple dimensional parameters mainly include：
The outer tube diameter D of nipple, wall thickness t, male end sealing surface diameter parameters dSealing surface pin, male end diameter of thread parameter dScrew thread pin, female end
Sealing surface diameter parameters dSealing surface box, female end diameter of thread parameter dScrew thread box, male and female end sealing surface angle parameter theta, male and female end screw thread
Taper parameter γ and male and female end thread pitch parameter p.
In the step S2, nipple twist-on parameter is obtained by the actual make-and-break test of new designs of threaded joints.Referring to
Fig. 4, the twist-on parameter mainly include：The upper button flex point torque T of nipple1, upper button flex point number of turns n1, final torque wrench moment
T2, final upper buckle ring number n2.The upper button flex point is that the point of curvature significant changes occurs for the torque wrench moment curve of nipple, i.e.,
T in Fig. 41Corresponding point；It is the point that beam is buckled on nipple finally above to detain, i.e. T in Fig. 42Corresponding point.
In step s3, calculated according to the dimensional parameters and twist-on parameter and twist-on length is detained on nipple, be specifically
Refer to the circular bead surface in nipple, several calculating points, each calculating of the present embodiment selection are respectively selected on sealing surface and screw thread position
Point 1-4 as shown in Figure 5 calculates point, wherein：Screw thread position selects two calculating points, and the big end of screw thread (calculating point 2) and screw thread are small
End (calculates point 1)；Sealing surface position selects one to calculate point (calculating point 4), circular bead surface position selection one calculates point and (calculates point
3).The point that the location contacts stress is maximum in each position is chosen during selection respectively and is used as calculating point.Then calculate respectively each
Point twist-on contact length is calculated, calculation procedure is as follows：
S31, calculates the relative displacement of nipple, and calculation formula is as follows：
d0=p* (n2-n1)
In formula：d0For the axially opposing displacement of nipple twist-on；P is male and female end thread pitch parameter；n1For upper button flex point
The number of turns；n2For final upper buckle ring number, i.e. 1-4 respectively calculates the axially opposing displacement d of nipple twist-on a little0It is identical；
S32, calculates the screw thread of nipple and its contact magnitude of interference at sealing surface position, calculation formula are as follows：
δScrew thread=dScrew thread pin-dScrew thread box
δSealing surface=dSealing surface pin-dSealing surface box
In formula：δScrew threadPoint is calculated to be in nipple screw thread position (the present embodiment refers to calculate point 2 and calculates point 1)
Screw thread radial direction matching allowance, the screw thread radial direction matching allowance of the calculating point (calculate point 2 and calculate point 1) in screw thread position
It is identical；δSealing surfaceTo be in the sealing surface radial fit that nipple sealing surface position calculates point (the present embodiment refers to calculate point 4)
The magnitude of interference；dSealing surface pinFor male end sealing surface diameter parameters；dScrew thread pinFor male end diameter of thread parameter；dSealing surface boxFor female end sealing surface
Diameter parameters；dScrew thread boxFor female end diameter of thread parameter.
S33, calculate the screw thread, sealing surface and the axial displacement at circular bead surface position of nipple；
For screw thread position, male and female end screw thread is the angle relative motion defined with taper, therefore its axial displacement calculates
Formula is as follows：
wScrew thread=γ * δScrew thread/2+d0
W in formulaScrew threadTo be in the spiral shell that nipple screw thread position calculates point (the present embodiment refers to calculate point 2 and calculates point 1)
Line axially engages displacement, and it is identical that the screw thread of the calculating point of the screw thread position axially engages displacement；γ is male and female end thread conical
Spend parameter；
For sealing surface position, male and female end in contact is with sealing surface angle relative motion, therefore its axial displacement calculating public affairs
Formula is as follows：
W in formulaSealing surfaceTo be in the sealing surface of the calculating point at nipple sealing surface position (the present embodiment refers to calculate point 4)
Axially engage displacement；
For circular bead surface position, male and female end in contact occurs after flex point appearance, therefore its axial displacement is：
wCircular bead surface=d0
W in formulaCircular bead surfaceTo be in the sealing surface of the calculating point at nipple sealing surface position (the present embodiment refers to calculate point 4)
Axially engage displacement；
S34, calculates the actual twist-on contact length of screw thread of nipple, and calculation formula is as follows：
L in formulaEiFor each corresponding actual twist-on contact length for calculating point；W is relative displacement, if being in nipple spiral shell
The calculating point (the present embodiment refers to calculate point 2 and calculates point 1) at line position, then W=WScrew thread；If it is in nipple sealing surface
The calculating point (the present embodiment refer to calculate point 4) at position, then W=WSealing surface；If it is in the calculating at nipple circular bead surface position
Point (the present embodiment refer to calculate point 3), then W=WCircular bead surface；P is male and female end thread pitch parameter；riFor residing for each corresponding calculating point
The radius of nipple pipe portion position, wherein i is each numbering (in the present embodiment, i=1,2,3,4) for calculating point, for tubing and casing
For joint, each position radius riChange is little, can take ri=D/2, then：
In the step S4, connect using finite element method and according to the dimensional parameters and twist-on parameter calculating screw thread
Beam contact stress is buckled on head.The contact stress belongs to state nonlinear problem, and contacting mechanism can consider when two solids connect
When touching, due to surface roughness, the maximum position of micro-bulge height sum contacts at first between two surfaces.As load increases
Add, other paired micro-bulges also corresponding contact；After each micro-bulge starts contact, elastic deformation occurs；When load exceedes certain
During one critical value, plastic deformation occurs or in elastic-plastic deformation state.
The concrete operations flow of the S4 includes：
S41, closed based on the obtained nipple relative displacement of the obtained nipple dimensional parameters of step S1 and step S31
System establishes nipple FEM model；
S42, the nipple twist-on parameter and step S31 that are obtained according to step S2 actually detain the displacement relation bar of twist-on
Part, boundary condition is added, boundary condition mainly includes material property, axial symmetry characteristic, contact performance etc., attached in calculating process
It is added in computation model；
S43, complete finite element analysis and calculating；
S44, extraction and analysis result, obtain the contact stress σ of each calculating point contact positioniNumerical value, wherein i is each calculating
The numbering (in the present embodiment, i=1,2,3,4) of point, shown in Fig. 6 is the contact stress analysis result at nipple 1-4 positions.
In step s 5, each corresponding actual twist-on contact length L for calculating point of nipple is utilizedEiWith connecing for contact site
Touch stress σi, nipple thread gluing risk factors are calculated, judge thread gluing risk size.Based on different failure mode thread gluing risks
Factor has many algorithms, and the present embodiment, which is chosen, simplifies algorithm, and calculation formula is as follows：
Fzi=σi*LEi
In formula, FziFor each corresponding thread gluing risk factors for calculating point, LEiLength is contacted for each corresponding actual twist-on for calculating point
Degree, wherein i are each numbering (in the present embodiment, i=1,2,3,4) for calculating point；σiIt is each corresponding contact stress for calculating point.
Table 1 respectively calculates point contact length contact stress and thread gluing risk factors table
From the calculating data (table 1) for the nipple for choosing experiment as can be seen that (calculating point from the big end of screw thread respectively
2), the contact stress that four screw thread small end (calculate point 1), sealing surface (calculating point 4), circular bead surface (calculating point 3) positions are chosen is most
In the contrast of big value node, contact stress is maximum (1456MPa), but thread gluing factor is minimum for circular bead surface (calculating point 3).Thread gluing factor
Maximum appears in screw thread small end position (calculating point 1), corresponding male end screw initial thread buckle position, is coincide with actually buckling fruit.
Those of ordinary skill in the art is it should be appreciated that the embodiment of the above is intended merely to the explanation present invention's
Purpose, and limitation of the invention is not used as, as long as in the essential scope of the present invention, the change to embodiment described above
Change, modification will all fall in the range of the claim of the present invention.
Claims (5)
1. a kind of nipple thread gluing Risk Forecast Method based on finite element analysis, it is characterised in that comprise the steps of：
S1, determined by way of the mapping in kind of the part dimension or new designs of threaded joints that are indicated on screw joint product structural drawings
Nipple dimensional parameters；
S2, nipple twist-on parameter is determined by the upper shackle actual tests of new designs of threaded joints；
S3, calculated according to the nipple dimensional parameters and twist-on parameter and twist-on length is detained on nipple；
S4, detained using finite element method and according on the nipple dimensional parameters and twist-on parameter calculating nipple
Contact stress；
S5, using twist-on length and Calculation of Contact Stress nipple thread gluing risk factors are detained on nipple, judge thread gluing wind
Dangerous size.
2. the nipple thread gluing Risk Forecast Method based on finite element analysis as claimed in claim 1, it is characterised in that：
In the step S1, the nipple dimensional parameters include：The outer tube diameter D of nipple, wall thickness t, male end sealing
Face diameter parameters dSealing surface pin, male end diameter of thread parameter dScrew thread pin, female end sealing surface diameter parameters dSealing surface box, the female end diameter of thread
Parameter dScrew thread box, male and female end sealing surface angle parameter theta, male and female end thread taper parameter γ and male and female end thread pitch parameter
p；
In the step S2, the twist-on parameter includes：The upper button flex point torque T of nipple1, upper button flex point number of turns n1, finally
Torque wrench moment T2, final upper buckle ring number n2。
3. the nipple thread gluing Risk Forecast Method based on finite element analysis, its feature exist as claimed in claim 1 or 2
In：
The step S3 refers to the circular bead surface in nipple, several calculating points is respectively selected on sealing surface and screw thread position, then
Each calculating point twist-on contact length is calculated respectively, and calculation procedure is as follows：
S31, calculates the relative displacement of nipple, and calculation formula is as follows：
d0=p* (n2-n1)
In formula：d0For the axially opposing displacement of nipple twist-on, each axially opposing displacement d of nipple twist-on for calculating point0It is phase
With；
S32, calculates the screw thread of nipple and its contact magnitude of interference at sealing surface position, calculation formula are as follows：
δScrew thread=dScrew thread pin-dScrew thread box
δSealing surface=dSealing surface pin-dSealing surface box
In formula：δScrew threadTo be in the screw thread radial direction matching allowance that screw thread position calculates point, the screw thread of point is calculated in screw thread position
The radial fit magnitude of interference is identical；δSealing surfaceTo be in the sealing surface radial fit magnitude of interference that nipple sealing surface position calculates point；
S33, calculate the screw thread, sealing surface and the axial displacement at circular bead surface position of nipple；
For screw thread position, male and female end screw thread is the angle relative motion defined with taper, and its axial displacement, calculation formula is such as
Under：
wScrew thread=γ * δScrew thread/2+d0
W in formulaScrew threadThe screw thread that point is calculated to be in nipple screw thread position axially engages displacement, the calculating of the screw thread position
It is identical that the screw thread of point axially engages displacement；
For sealing surface position, male and female end in contact is as follows with sealing surface angle relative motion, its axial displacement, calculation formula：
W in formulaSealing surfaceThe sealing surface that point is calculated to be in nipple sealing surface position axially engages displacement；
For circular bead surface position, male and female end in contact occurs after flex point appearance, and its axial displacement is：
wCircular bead surface=d0
W in formulaCircular bead surfaceThe sealing surface that point is calculated to be in nipple sealing surface position axially engages displacement；
S34, calculates the actual twist-on contact length of screw thread of nipple, and calculation formula is as follows：
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L in formulaEiFor each corresponding actual twist-on contact length for calculating point；
W is relative displacement in formula, if being in the calculating point of nipple screw thread position, W=WScrew thread；If it is in screw thread to connect
The calculating point at head sealing surface position, then W=WSealing surface；If it is in the calculating point at nipple circular bead surface position, W=WCircular bead surface；
R in formulaiFor each corresponding radius for calculating nipple pipe portion position residing for point, wherein i is each numbering for calculating point, for oil
For casing joint, each position radius riChange is little, takes ri=D/2, then above-mentioned LEiCalculation formula be：
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4. the nipple thread gluing Risk Forecast Method based on finite element analysis as claimed in claim 3, it is characterised in that：
The step S4 includes：
S41, spiral shell is established based on the obtained nipple relative displacement relation of the obtained nipple dimensional parameters of step S1 and S31
Line joint FEM model；
S42, the nipple twist-on parameter and step S31 that are obtained according to step S2 actually detain the displacement relation condition of twist-on,
Boundary condition is added, boundary condition mainly includes material property, axial symmetry characteristic, contact performance etc., is added in calculating process
Into computation model；
S43, complete finite element analysis and calculating；
S44, extraction and analysis result, obtain the contact stress σ of each calculating point contact positioniNumerical value, wherein i be it is each calculate point
Numbering.
5. the nipple thread gluing Risk Forecast Method based on finite element analysis as claimed in claim 4, it is characterised in that：
In the step S5, each corresponding actual twist-on contact length L for calculating point of nipple is utilizedEiContact with contact site
Stress σi, nipple thread gluing risk factors are calculated, judge thread gluing risk size, formula is as follows：
Fzi=σi*LEi
In formula, FziFor each corresponding thread gluing risk factors for calculating point, wherein i is each numbering for calculating point.
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| CN107506506B CN107506506B (en) | 2020-11-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112084588A (en) * | 2020-08-31 | 2020-12-15 | 东风商用车有限公司 | Support bolt arrangement method using simulation optimization |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU621147B2 (en) * | 1988-09-02 | 1992-03-05 | Exxon Production Research Company | Torque position makeup of tubular connections |
| CN101696621A (en) * | 2009-11-04 | 2010-04-21 | 天津钢管集团股份有限公司 | Air-tight seal screw joint |
| CN103696705A (en) * | 2013-12-16 | 2014-04-02 | 天津商业大学 | Control method of interference amount of threads of buttress special threaded oil casing |
-
2016
- 2016-06-14 CN CN201610414645.9A patent/CN107506506B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU621147B2 (en) * | 1988-09-02 | 1992-03-05 | Exxon Production Research Company | Torque position makeup of tubular connections |
| CN101696621A (en) * | 2009-11-04 | 2010-04-21 | 天津钢管集团股份有限公司 | Air-tight seal screw joint |
| CN103696705A (en) * | 2013-12-16 | 2014-04-02 | 天津商业大学 | Control method of interference amount of threads of buttress special threaded oil casing |
Non-Patent Citations (1)
| Title |
|---|
| 孙建安等: "快速上扣螺纹接头的有限元分析及优化设计", 《宝钢技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112084588A (en) * | 2020-08-31 | 2020-12-15 | 东风商用车有限公司 | Support bolt arrangement method using simulation optimization |
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