CN106951647A - The hexahedral mesh partitioning of taper thread joint - Google Patents
The hexahedral mesh partitioning of taper thread joint Download PDFInfo
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Abstract
The invention discloses a kind of hexahedral mesh partitioning of taper thread joint, by the way that cutting perpendicular to axis direction and in the axial direction is carried out in finite element software to the male and female taper thread worked good；Pass through the boundary condition of the plane of reference of establishment and the Surface Creation intersection of model as grid division；The plane grid shape of end face at foundation grid density, the section cutting of reasonable construction effective thread；The grid node at pin and box sub mating surface is set to align by setting up node；Extract previous screw thread and finished the surface of hexahedral mesh as the boundary condition for drawing latter screw thread grid, to ensure the continuity of grid；To the grid at non-threaded place, size of mesh opening is suitably increased.The present invention can substantially improve taper thread joint mesh quality, improve simulation accuracy and efficiency, and can promote the hexahedral mesh division for any type screw thread.
Description
Technical field
Acted on the present invention relates to the technical field of taper thread joint, more particularly to a kind of energy Accurate Analysis drilling rod by external force
The hexahedral mesh partitioning of the taper thread joint of the stress distribution situation of lower nipple.
Background technology
Taper thread joint is widely adopted due to its good sealing in probing industry, in drilling process, drilling rod
In the presence of the power such as frictional force, pressure, centrifugal force, gravity, moment of torsion, moment of flexure, easily it is damaged, influences project progress.Cause
This designs the mechanical performance that the nipple with good mechanical properties will greatly improve drilling rod, reduces loss.At this stage, bore
The bench test machine of knock-off joint can only load moment of flexure and moment of torsion, it is impossible to imitate real drilling condition completely, therefore utilize limited
First emulation technology carries out tooth stress analysis, analysis of fatigue, optimization screw thread and joint design to screw thread and has been used.
For Finite Element Simulation Analysis, the quality of grid directly determines the precision and efficiency of calculating.At this stage, screw thread point
Analysis is more to be analyzed using two-dimensional axisymmetric analysis or picture tetrahedral grid, and two-dimensional axisymmetric analysis can not consider threedimensional model
Geometric effect, tetrahedral grid analysis can not ensure precision and operation efficiency.For nipple, due to its contact surface
And working environment is complicated, high-precision analysis result could be designed with directive significance to it, using in operational precision and efficiency
Aspect hexahedral mesh with the obvious advantage carries out simulation analysis to screw thread and just seems very necessary, and mating surface grid node aligns
Hexahedral mesh can obtain more accurate result.What Xi'an Communications University proposed《A kind of achievable hexahedral mesh is divided
Bolt parametric Finite Element Modeling Method》Cylindrical thread can only be modeled with specific method and gridding, it is impossible to
Grid applied to taper thread is built, and can not also draw the hexahedral mesh of pin and box sub grid node alignment, and method is extremely
Complexity, pre-treatment workload is huge.
Therefore, the designer of the present invention is in view of drawbacks described above, it is comprehensive to be engaged in for many years for a long time by concentrating on studies and designing
The experience and achievement of related industry, propose that a kind of workload is small, it is adaptable to the hexahedral mesh division methods meaning of taper thread joint
Justice is great, to overcome drawbacks described above.
The content of the invention
It is an object of the invention to provide a kind of hexahedral mesh partitioning of taper thread joint, improve taper thread grid and draw
Sub-prime amount, reduces technical staff's workload, improves simulation calculation precision and efficiency.
To solve the above problems, the invention discloses a kind of hexahedral mesh partitioning of taper thread joint, its feature exists
In comprising the steps of：
Step 1, the taper thread joint that has assembled carried out perpendicular to axis and along the cutting of axis；
Step 2, a certain effective a quarter screw thread for taking taper thread joint after cutting, effective thread end parallel to
Set up Equidistant Nodes in the geometrical edge boundary line of axis, cross node and set up the plane of reference perpendicular to axis, with the plane of reference and screw thread
Surface creation intersection；
Step 3, excessively axis set up the angularly plane of reference；
What step 4, the intersection set up with step 2 and the boundary line of a quarter effective thread itself and step 3 were set up
The plane of reference creates node；
Step 5, establishment plane quadrilateral grid, grid on two end faces of effective a quarter screw thread of taper thread joint
Using intersection as boundary condition；
Grid that node that step 6, the intersection set up with step 2, step 4 are set up, step 5 are created and effective four/
The geometrical relationship of one screw thread in itself is boundary condition, draws hexahedral mesh grid cell；
Step 7, a quarter screw thread for taking the taper thread joint being engaged after cutting with step 3 selection screw thread, repeat to use
The method of step 2~step 6 draws hexahedral mesh；
Step 8, the method for weight 2~step 7 of de-multiplexing steps draw other taper thread joint and its taper thread being engaged
The hexahedral mesh of 3/4ths screw threads of joint；
Step 9, using the surface for the hexahedral mesh finished as adjacent two sections of screw threads boundary condition；
Step 10,2~step 9 of repeat step, draw remaining thread segment and the hexahedral mesh grid at other positions of joint
Unit.
Wherein：In step 1, cutting, specific steps are carried out to the taper thread joint assembled using finite element software
For：The cutting perpendicular to axis first is carried out according to pitch at effective thread, non-threaded place divided by structure, then along axis
It is upper to carry out cutting with two mutually perpendicular faces.
Wherein：The thread surface of step 3 refers to and the intersecting face of the plane of reference set up.
Wherein：The intersection point of taper thread joint on the contact surface is overlapped in step 4, therefore using intersection point as the grid of boundary condition
Node is also overlapped.
Wherein：The node alignment of pin and box sub grid drawn by step 10 on the contact surface.
By said structure, the hexahedral mesh partitioning of taper thread joint of the invention has the effect that：
1st, realize and quickly divide, high practicability；
2nd, taper thread joint mesh quality is substantially improved, simulation accuracy and efficiency is improved；
3rd, the hexahedral mesh division for any type screw thread can be promoted, is applicable more extensive.
The detailed content of the present invention can be obtained by explanation described later and institute's accompanying drawing.
Brief description of the drawings
Figure 1A to Fig. 1 C, which to be shown, the taper thread joint that has assembled is carried out perpendicular to axis and along the cutting of axis；
Fig. 2A to Fig. 2 D shows the step of setting up intersection；
Fig. 3 A to Fig. 3 C show the step of setting up node；
Fig. 4 A to Fig. 4 B are shown creates plane grid on two end faces of a quarter effective thread；
Fig. 5 shows male joint a quarter effective thread hexahedral mesh；
Fig. 6 shows female joint a quarter effective thread hexahedral mesh；
Fig. 7 shows pin and box sub a quarter screw thread hexahedral mesh；
Fig. 8 A to Fig. 8 C show one effective thread hexahedral mesh of pin and box sub；
Fig. 9, which is shown, extracts previous effective thread hexahedral mesh surface as the perimeter strip for drawing next effective thread
Part；
Figure 10 shows complete male joint hexahedral mesh；
Figure 11 shows complete female joint hexahedral mesh；
Figure 12 shows pin and box sub ligand hexahedral mesh sectional view；
Figure 13 A to Figure 13 B show the enlarged diagram of pin and box sub ligand hexahedral mesh.
Embodiment
Referring to Fig. 1 to Figure 12, it is shown that the hexahedral mesh partitioning of taper thread joint of the invention.
The hexahedral mesh partitioning of the taper thread joint can be comprised the steps of：
1) taper thread joint that has assembled is carried out perpendicular to axis and along the cutting of axis, it is preferred that the cone
Nipple can be male joint or female joint, coordinate the cutting at section perpendicular to axis to enter using a pitch as interval in screw thread
OK, it is in angularly to be divided into four parts by the taper thread joint along the cutting of axis；
2) a certain effective a quarter screw thread of taper thread joint after cutting (male joint or female joint) is taken, in effective thread
The plane of reference of the node foundation perpendicular to axis is crossed, with ginseng in end parallel to Equidistant Nodes are set up in the geometrical edge boundary line of axis
Examine the surface creation intersection of face and screw thread；
3) cross axis and set up the angularly plane of reference, the plane of reference number depend on the quantity of grid；
4) use step 2) set up intersection and a quarter effective thread itself boundary line and step 3) set up ginseng
Examine face and create node；The intersection point of taper thread joint (male joint or female joint) on the contact surface is overlapped, therefore using intersection point as border
The grid node of condition is also overlapped；
5) plane four is created on two end faces of effective a quarter screw thread of taper thread joint (male joint or female joint)
Side shape grid, grid is using intersection as boundary condition；
6) with step 2) intersection set up, step 4) set up node, step 5) grid that creates and effective four/
The geometrical relationship of one screw thread in itself is boundary condition, draws hexahedral mesh grid cell.
7) take after cutting with step 3) choose the taper thread joint (female joint or male joint) that is engaged of screw thread four/
One screw thread, weight de-multiplexing steps 2)~step 6) method draw hexahedral mesh；
8) weight de-multiplexing steps 2)~step 7) method draw other taper thread joint (male joint or female joint) and its
The hexahedral mesh of 3/4ths screw threads of the taper thread joint (female joint or male joint) being engaged；
9) using the surface for the hexahedral mesh finished as adjacent two sections of screw threads (fittings body) boundary condition；
10) repeat step 2)~step 9), draw remaining thread segment and the hexahedral mesh grid list at other positions of joint
Member.
Below by taking the tool joints of Φ 50 as an example, with reference to accompanying drawing, the present invention is described in detail.
Step 1, taper thread joint carried out perpendicular to axis and along the cutting of axis.Dicing process is to having worked good
Male joint and female joint are carried out simultaneously, and in effective thread section, cutting is carried out by interval of a pitch, at non-threaded section, according to
Structure carries out reasonable cutting.Figure 1A to Fig. 1 C show the effect after cutting.
Step 2, a certain effective a quarter screw thread for taking male joint after cutting (or female joint), in effective thread end
Parallel to Equidistant Nodes are set up in the geometrical edge boundary line of axis, cross node and set up the plane of reference perpendicular to axis, with the plane of reference and
The surface creation intersection of screw thread, intersection is used as one of boundary condition for drawing hexahedral mesh.Fig. 2A to Fig. 2 D show establishment and handed over
Line process.
Step 3, cross axis and set up the angularly plane of reference, the number of the plane of reference depends on the size of grid, by the plane of reference with
The intersection point of intersection as grid node.Fig. 3 A to Fig. 3 C show the establishment process of node.
Step 4, the establishment plane quadrilateral grid in male joint (or female joint) effectively a quarter two end faces of screw thread.
Fig. 4 A to Fig. 4 B show plane quadrilateral grid and create process.
Step 5, using intersection, node, plane quadrilateral grid, the geometrical boundary of effective a quarter screw thread in itself as border
Condition, draws hexahedral mesh grid cell.Fig. 5 show drawn hexahedral mesh.
Step 6, take with choosing female joint (or male joint) a quarter screw thread for being engaged of a quarter screw thread, to hand over
Line, node, plane quadrilateral grid, the geometrical boundary of effective a quarter screw thread in itself are boundary condition, draw hexahedron net
Lattice grid cell.Fig. 6 show drawn hexahedral mesh.
Step 7, determine pin and box sub grid matching conjunction state as shown in Figure 7.
Step 8, repetition above step, draw the hexahedral mesh of complete effective thread section.Shown in Fig. 8 A to Fig. 8 C
For the hexahedral mesh of an effective thread section.
The surface for the effective thread section hexahedral mesh that step 9, extraction have been finished is as adjacent two sections of screw threads (fittings body)
Boundary condition.Fig. 9 show the surface for extracting the effective thread section hexahedral mesh finished.
Step 10, repetition above step, draw remaining thread segment and the hexahedral mesh grid cell at other positions of joint.
Figure 10, Figure 11, Figure 12, Figure 13 A to Figure 13 B are the hexahedral mesh of complete pin and box sub.
Wherein, in step 1, cutting, specific steps are carried out to the taper thread joint assembled using finite element software
For：The cutting perpendicular to axis first is carried out according to pitch at effective thread, non-threaded place divided by structure, then along axis
It is upper to carry out cutting with two mutually perpendicular faces.
Wherein, the thread surface of step 3 refers to and the intersecting face of the plane of reference set up.
Wherein, the node alignment of pin and box sub grid drawn by step 10 on the contact surface.
Thus, the present invention by being carried out in finite element software to the male and female taper thread worked good perpendicular to axis direction and
Cutting in the axial direction；Pass through the boundary condition of the plane of reference of establishment and the Surface Creation intersection of model as grid division；
The plane grid shape of end face at foundation grid density, the section cutting of reasonable construction effective thread；Male and female is connect by setting up node
Grid node alignment at head mating surface；Extract previous screw thread and finish the surface of hexahedral mesh as the latter screw thread grid of picture
Boundary condition, to ensure the continuity of grid；To the grid at non-threaded place, size of mesh opening is suitably increased.The present invention can be significantly
Improve taper thread joint mesh quality, improve simulation accuracy and efficiency, and the hexahedron net for any type screw thread can be promoted
Lattice are divided.
It is readily apparent that the description and record of the above are only illustrated in the disclosure being not intended to be limiting of the invention
Hold, using or use.Although being described in embodiment and embodiment being described in the drawings, the present invention is not limited
By accompanying drawing example and described in embodiment as it is now recognized that optimal mode to implement the particular case of the teachings of the present invention
Son, the scope of the present invention is by any embodiment including falling into description and appended claims above.
Claims (5)
1. the hexahedral mesh partitioning of a kind of taper thread joint, it is characterised in that comprise the steps of：
Step 1, the taper thread joint that has assembled carried out perpendicular to axis and along the cutting of axis；
Step 2, a certain effective a quarter screw thread for taking taper thread joint after cutting, in effective thread end parallel to axis
Geometrical edge boundary line on set up Equidistant Nodes, cross node and set up the plane of reference perpendicular to axis, with the surface of the plane of reference and screw thread
Create intersection；
Step 3, excessively axis set up the angularly plane of reference；
The reference that step 4, the intersection set up with step 2 and the boundary line of a quarter effective thread itself and step 3 are set up
Face creates node；
Step 5, plane quadrilateral grid is created on two end faces of effective a quarter screw thread of taper thread joint, grid is to hand over
Line is boundary condition；
Grid and effective a quarter spiral shell that step 6, the intersection set up with step 2, the node of step 4 foundation, step 5 are created
The geometrical relationship of line in itself is boundary condition, draws hexahedral mesh grid cell；
Step 7, a quarter screw thread for taking the taper thread joint being engaged after cutting with step 3 selection screw thread, weight de-multiplexing steps 2
The method of~step 6 draws hexahedral mesh；
Step 8, the method for weight 2~step 7 of de-multiplexing steps draw other taper thread joint and its taper thread joint being engaged
3/4ths screw threads hexahedral mesh；
Step 9, using the surface for the hexahedral mesh finished as adjacent two sections of screw threads boundary condition；
Step 10,2~step 9 of repeat step, draw remaining thread segment and the hexahedral mesh grid cell at other positions of joint.
2. hexahedral mesh partitioning as claimed in claim 1, it is characterised in that：In step 1, finite element software pair is utilized
The taper thread joint assembled carries out cutting, concretely comprises the following steps：First carried out at effective thread according to pitch perpendicular to axis
Cutting, non-threaded place is divided by structure, then carries out cutting with two mutually perpendicular faces along along axis.
3. hexahedral mesh partitioning as claimed in claim 1, it is characterised in that：The thread surface of step 3 refers to and built
The intersecting face of the vertical plane of reference.
4. hexahedral mesh partitioning as claimed in claim 1, it is characterised in that：Taper thread joint is in contact surface in step 4
On intersection point overlap, therefore grid node using intersection point as boundary condition is also overlapped.
5. hexahedral mesh partitioning as claimed in claim 1, it is characterised in that：Pin and box sub grid is connecing drawn by step 10
Node alignment in contacting surface.
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| CN201710180631.XA CN106951647B (en) | 2017-03-24 | 2017-03-24 | Hexahedral mesh division method for taper thread joint |
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| CN201710180631.XA CN106951647B (en) | 2017-03-24 | 2017-03-24 | Hexahedral mesh division method for taper thread joint |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112347682A (en) * | 2020-11-26 | 2021-02-09 | 北京工业大学 | Method for dividing hexahedral mesh containing transition mesh and lead angle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080243454A1 (en) * | 2007-03-30 | 2008-10-02 | Jean-Laurent Mallet | Partitioning algorithm for building a stratigraphic grid |
| CN102332047A (en) * | 2011-10-09 | 2012-01-25 | 西安交通大学 | Bolt finite element parametric modeling method capable of realizing hexahedron grid division |
| CN106202639A (en) * | 2016-06-29 | 2016-12-07 | 北京强度环境研究所 | A kind of MJ bolt and nut finite element grid modeling method |
-
2017
- 2017-03-24 CN CN201710180631.XA patent/CN106951647B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080243454A1 (en) * | 2007-03-30 | 2008-10-02 | Jean-Laurent Mallet | Partitioning algorithm for building a stratigraphic grid |
| CN102332047A (en) * | 2011-10-09 | 2012-01-25 | 西安交通大学 | Bolt finite element parametric modeling method capable of realizing hexahedron grid division |
| CN106202639A (en) * | 2016-06-29 | 2016-12-07 | 北京强度环境研究所 | A kind of MJ bolt and nut finite element grid modeling method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112347682A (en) * | 2020-11-26 | 2021-02-09 | 北京工业大学 | Method for dividing hexahedral mesh containing transition mesh and lead angle |
| CN112347682B (en) * | 2020-11-26 | 2024-04-19 | 北京工业大学 | Threaded hexahedral mesh dividing method comprising excessive meshes and lead angles |
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