CN114458934A - Member and joint integrated composite material pretightening force longitudinal fractal tooth connecting device - Google Patents
Member and joint integrated composite material pretightening force longitudinal fractal tooth connecting device Download PDFInfo
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- CN114458934A CN114458934A CN202210041964.5A CN202210041964A CN114458934A CN 114458934 A CN114458934 A CN 114458934A CN 202210041964 A CN202210041964 A CN 202210041964A CN 114458934 A CN114458934 A CN 114458934A
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- teeth
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- fractal
- metal sleeve
- material pipe
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- 239000002131 composite material Substances 0.000 title claims abstract description 123
- 229910052751 metal Inorganic materials 0.000 claims abstract description 74
- 239000002184 metal Substances 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000036316 preload Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000003672 processing method Methods 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Images
Classifications
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- 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
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/64—Joining a non-plastics element to a plastics element, e.g. by force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5227—Joining tubular articles for forming multi-tubular articles by longitudinally joining elementary tubular articles wall-to-wall (e.g. joining the wall of a first tubular article to the wall of a second tubular article) or for forming multilayer tubular articles
- B29C66/52271—Joining tubular articles for forming multi-tubular articles by longitudinally joining elementary tubular articles wall-to-wall (e.g. joining the wall of a first tubular article to the wall of a second tubular article) or for forming multilayer tubular articles one tubular article being placed inside the other
- B29C66/52272—Joining tubular articles for forming multi-tubular articles by longitudinally joining elementary tubular articles wall-to-wall (e.g. joining the wall of a first tubular article to the wall of a second tubular article) or for forming multilayer tubular articles one tubular article being placed inside the other concentrically, e.g. for forming multilayer tubular articles
-
- 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
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
- F16S3/06—Assemblies of elongated members
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention relates to a longitudinal fractal tooth connecting device for pretightening force of a component and joint integrated composite material. Comprises an external metal sleeve, a composite pipe and an internal metal sleeve; the inner surface and the outer surface of the composite material pipe are respectively provided with a plurality of longitudinal fractal teeth which are integrally formed with the composite material pipe, the longitudinal fractal teeth are arranged in parallel to the axis of the composite material pipe, and the plurality of fractal teeth are uniformly arranged along the circumferential direction of the composite material pipe; the inner surface of the outer metal sleeve is provided with fractal teeth matched with the fractal teeth on the outer surface of the composite material pipe, the outer surface of the inner metal sleeve is provided with fractal teeth matched with the fractal teeth on the inner surface of the composite material pipe, and after the inner metal sleeve, the composite material pipe and the outer metal sleeve are sequentially assembled, force is applied to enable the outer metal sleeve to generate plastic deformation, so that the whole joint generates pretightening force, and connection is achieved. According to the invention, the connection of the composite material pipe is realized through the integrally formed longitudinal fractal teeth, and the strength of the composite material pipe is improved through the longitudinal fractal teeth.
Description
Technical Field
The invention belongs to the field of composite material connection, and particularly relates to a composite material connecting method for improving the bearing capacity of the existing composite material connecting technology and further reducing the weight of a composite material connecting part and a component.
Background
The composite material connecting technology mainly comprises the following steps: bolt connection, glue joint, glue and screw mixed connection and composite material pretightening force tooth connection. These connection techniques all have certain disadvantages: for the bolt connection, the rubber-screw mixed connection and the pre-tightening force tooth connection of the composite material, secondary processing such as hole opening or tooth punching needs to be carried out on the composite material at the connection position. This not only increases the cost of making the joint, but also disrupts the continuity of the fibers, thereby reducing the load bearing capacity of the composite joint. Although the composite material is not required to be subjected to secondary processing in the process of gluing the composite material, the colloid is subjected to secondary curing, so that the shearing strength of the colloid at the joint is low, and the joint is easy to age, so that the bearing capacity of the joint is not high. Meanwhile, the existing composite material connecting technology only considers the connecting efficiency of the connecting part and does not consider the mechanical property of the rod piece.
The patent of the prior patent CN201710942875.7, entitled "a high-load-bearing, high-fatigue-performance composite material multi-stage pipe tooth connecting device", discloses a structure: outer metal tube, inner metal tube, transition metal tube. The outer metal pipe, the composite material pipe and the inner metal pipe are sequentially arranged from outside to inside; the outer metal pipe, the inner metal pipe and the composite material pipe are in force transmission through a tooth meshing effect and/or friction force generated by pretightening force; wherein, the outer metal pipe and the composite pipe are provided with teeth which are mutually meshed, and/or the inner metal pipe and the composite pipe are mutually meshed; the pretightening force is extruded through the outer metal sleeve to enable the outer metal sleeve to generate deformation application and/or the inner metal extruded composite material pipe to generate deformation application. As an improvement, the teeth in the joint are single-stage teeth or multi-stage teeth, and the fatigue performance of the joint is improved through the multi-stage teeth. However, these teeth are formed by secondary operations on the composite material that break the continuity of the fibers in the composite material. The bearing capacity of the entire joint is not fully developed.
The patent of the prior publication, which is named as "a high-load-bearing composite material fractal tooth connecting device based on soft substances" (application number: 202110631498.1), discloses the structure as follows: the composite board connection comprises a metal board connecting piece, a composite board, a soft substance and a pretightening force applying device: and preparing multi-stage fractal teeth on the composite material plate and the metal plate, reserving a gap between the metal teeth and the composite material teeth, and determining the size of the gap according to the rigidity of the soft substance. In the assembling process, the metal teeth and the composite material teeth are firstly assembled, then the gaps are filled up through soft substances, and finally pretightening force is applied through bolts on two sides of the metal plate. The patent only optimizes the tooth load distribution proportion of the composite material, and can solve the problem of secondary processing or secondary curing in the existing composite material connecting technology. In addition, the load is transmitted through the shear surface of the composite material in the connection mode, and the interlaminar shear strength of the material determines the bearing capacity of the joint.
Meanwhile, the existing composite pipes are all uniform in wall thickness, and the composite pipes often need larger thickness in order to increase the local stability of the composite pipes, so that the weight of the composite pipes is increased, and the bearing capacity of the composite pipes cannot be fully exerted. This is one of the reasons why composite pipes are difficult to apply in large quantities in civil engineering.
Disclosure of Invention
The invention aims to provide a component and joint integrated composite material pre-tightening force longitudinal fractal tooth connecting device, which is used for molding composite material fractal teeth and a composite material pipe at one time, and avoids secondary processing so as to improve the connecting efficiency of a composite material connecting part. The composite material pipe with the longitudinal teeth can not only transmit load, but also reduce the wall thickness of the composite material pipe, thereby further reducing the weight of the connecting part and the component.
The technical solution for realizing the purpose of the invention is as follows: a longitudinal fractal tooth connecting device for a composite material pipe comprises an outer metal sleeve, the composite material pipe and an inner metal sleeve;
the inner surface and the outer surface of the composite material pipe are respectively provided with a plurality of longitudinal fractal teeth which are integrally formed with the composite material pipe, the longitudinal fractal teeth are arranged in parallel to the axis of the composite material pipe, and the fractal teeth are uniformly arranged along the circumferential direction of the composite material pipe;
the inner surface of the outer metal sleeve is provided with fractal teeth matched with the fractal teeth on the outer surface of the composite material pipe, the outer surface of the inner metal sleeve is provided with fractal teeth matched with the fractal teeth on the inner surface of the composite material pipe, and after the inner metal sleeve, the composite material pipe and the outer metal sleeve are sequentially assembled, force is applied to enable the outer metal sleeve to generate plastic deformation, so that the whole joint generates pretightening force, and connection is achieved.
Furthermore, single-stage teeth are adopted to replace fractal teeth.
Furthermore, the single-stage teeth are any one or more of trapezoidal teeth, right-angle teeth or circular arc teeth.
Furthermore, the fractal teeth are any one or more of secondary teeth, tertiary teeth and quaternary teeth.
A method for connecting by adopting the device comprises the following steps:
step (1): pultrusion is carried out on the composite material pipe with the inner surface and the outer surface provided with longitudinal fractal teeth;
step (2): assembling the inner metal sleeve and the composite tube through the teeth;
and (3): and inserting the composite material pipe assembled with the inner metal sleeve into the outer metal sleeve, and after the composite material pipe is assembled, enabling the outer metal sleeve to generate plastic deformation through an external extrusion device, so as to generate pretightening force.
Furthermore, in the step (3), pre-tightening force is applied to the assembled external metal sleeve in a squeezing or interference fit mode.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the composite material teeth and the composite material pipe are formed in a pultrusion mode, and secondary processing of the composite material teeth is avoided; due to the integral molding of the composite material teeth and the composite material pipe, the strength of the composite material at the joint cannot be weakened, so that the connection efficiency of the joint is improved, and the processing cost of the composite material joint is reduced.
(2) Different from the traditional composite material pretightening force tooth: the composite material tooth provided by the invention is along the length direction, and the direction of the existing composite material pre-tightening force tooth is annular; when the composite material tooth is in the annular direction, the composite material tooth needs to be screwed into the metal sleeve during assembly, and the problems of high assembly difficulty and high required machining precision exist. However, when the composite material tooth is in the longitudinal direction, the tooth only needs to be directly inserted into the metal sleeve, so that the assembly difficulty is greatly reduced, and meanwhile, the requirement on the precision of the composite material tooth is not high.
(3) The joint provided by the invention transmits load through friction force, so that the more the number of the tooth fractal is, the larger the contact area of the composite material and the metal sleeve is, the larger the transmitted friction force is; when the traditional teeth are connected, load is transmitted through the shearing surface of the composite material teeth; therefore, the joint provided by the invention needs to prepare three-stage or even four-stage fractal teeth to increase the friction contact surface so as to improve the bearing capacity of the joint.
(4) Compared with the traditional composite pipe tooth connection, the tooth processing method has the advantages that the tooth processing method is different from the traditional composite pipe tooth processing method, and not only can the longitudinal tooth be independently prepared on the inner wall and the outer wall of the composite material, but also the longitudinal tooth can be jointly prepared on the inner wall and the outer wall; this increases the composite friction surface area and further increases the bearing capacity of the joint.
(5) The longitudinal teeth directly pultruded in the pultrusion process can be used for the assembly connection of the composite material and the metal sleeve, and simultaneously, the geometric rigidity of the composite material pipe is increased after the inner wall or the outer wall of the composite material pipe is provided with the longitudinal fractal teeth, so that the local stability of the composite material pipe can be improved, and the dead weight of the composite material pipe is reduced; therefore, the integral design of the fractal teeth on the component and the joint realizes the increase of the bearing capacity and the reduction of the weight of the joint and the component.
Drawings
Fig. 1 is an overall schematic view of the connecting device of the present invention.
Fig. 2 is a cross-sectional view of the connection device of the present invention.
Fig. 3 is a three-dimensional schematic view of a composite tube of the present invention.
Figure 4 is a cross-sectional view of a composite tube of the present invention.
FIG. 5 is a three-dimensional schematic view of an outer metal sleeve of the present invention.
FIG. 6 is a cross-sectional view of the outer metal sleeve of the present invention.
FIG. 7 is a three-dimensional schematic view of the inner metal sleeve of the present invention.
FIG. 8 is a cross-sectional view of the inner metal sleeve of the present invention.
FIG. 9 is a schematic illustration of pretension application.
Description of reference numerals:
1-composite material pipe, 2 outer metal sleeve, 3-inner metal sleeve and 4-fractal tooth.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
A composite material pre-tightening force longitudinal fractal tooth connecting structure with integrally designed components and joints is as follows: the connection includes an outer metal sleeve, an intermediate composite tube, and an inner metal tube. In the pultrusion production process of the composite material pipe, composite material fractal teeth are longitudinally pultruded along the interior of the composite material pipe, and the number of the fractal teeth and the stage number of the fractal teeth are adjusted according to the bearing capacity of the joint. And preparing multi-stage teeth matched with the inner wall of the composite material pipe on the outer wall of the inner metal sleeve, and assembling the inner metal sleeve and the composite material pipe through the teeth. And then screwing the composite material pipe assembled on the inner metal sleeve into the outer metal sleeve. After the metal sleeve and the composite material pipe are assembled, the external metal sleeve generates plastic deformation through the external extrusion device, and therefore pretightening force is generated.
Example 1
Inner and outer metal sleeves, and a pultrusion composite material tube. The wall thickness of the composite material pipe is 8mm, and the thickness of the inner metal sleeve and the outer metal sleeve is 6 mm. Three-stage teeth which are uniformly distributed along the circumference are prepared on the inner wall of the outer metal sleeve, and the depth and the thickness of each stage of teeth are respectively 1.5mm, 1mm and 0.5 mm. In order to match the local compressive bearing capacity of the joint with the bearing capacity of the joint, the number of longitudinal teeth prepared in the circumferential direction of the outer metal sleeve is 16, and the longitudinal teeth are uniformly distributed in the circumferential direction. And three-stage teeth which are uniformly distributed along the circumference are prepared on the outer wall of the inner metal sleeve, and the geometric dimension of the teeth is the same as that of the outer metal sleeve. When the composite material pipe is pultruded, longitudinal parting teeth matched with the inner and outer metal sleeves are pultruded on the inner and outer walls of the composite material pipe through a pultrusion process, and the composite material pipe and the inner and outer metal sleeves are assembled through the composite material longitudinal teeth. And finally applying pretightening force to the joint in a squeezing or interference fit mode.
The present invention is not limited to the above-described embodiments, and any obvious modifications and alterations by those skilled in the art can be made without departing from the spirit of the present invention.
Claims (6)
1. A component and joint integrated composite pre-tightening force longitudinal fractal tooth connecting device is characterized by comprising an external metal sleeve, a composite material pipe and an internal metal sleeve;
the inner surface and the outer surface of the composite material pipe are respectively provided with a plurality of longitudinal fractal teeth which are integrally formed with the composite material pipe, the longitudinal fractal teeth are arranged in parallel to the axis of the composite material pipe, and the fractal teeth are uniformly arranged along the circumferential direction of the composite material pipe;
the inner surface of the outer metal sleeve is provided with fractal teeth matched with the fractal teeth on the outer surface of the composite material pipe, the outer surface of the inner metal sleeve is provided with fractal teeth matched with the fractal teeth on the inner surface of the composite material pipe, and after the inner metal sleeve, the composite material pipe and the outer metal sleeve are sequentially assembled, force is applied to enable the outer metal sleeve to generate plastic deformation, so that the whole joint generates pretightening force, and connection is achieved.
2. The coupling device of claim 1, wherein single-stage teeth are used in place of fractal teeth.
3. The connecting device according to claim 2, wherein the single-stage teeth are any one or more of trapezoidal teeth, right-angle teeth or circular arc teeth.
4. The connecting device according to claim 1, characterized in that the fractal teeth are any one or any several of secondary, tertiary and quaternary teeth.
5. A method of connecting using the device of any of claims 1-4, comprising the steps of:
step (1): pultrusion is carried out on the composite material pipe with the inner surface and the outer surface provided with longitudinal fractal teeth;
step (2): assembling the inner metal sleeve and the composite tube through the teeth;
and (3): and inserting the composite material pipe assembled with the inner metal sleeve into the outer metal sleeve, and after the composite material pipe is assembled, enabling the outer metal sleeve to generate plastic deformation through an external extrusion device, so as to generate pretightening force.
6. The method of claim 5, wherein the step (3) applies the pre-load force to the assembled outer metal sleeve by pressing or interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210041964.5A CN114458934B (en) | 2022-01-14 | 2022-01-14 | Longitudinal fractal tooth connecting device for pretightening force of component and joint integrated composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210041964.5A CN114458934B (en) | 2022-01-14 | 2022-01-14 | Longitudinal fractal tooth connecting device for pretightening force of component and joint integrated composite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114458934A true CN114458934A (en) | 2022-05-10 |
| CN114458934B CN114458934B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210041964.5A Active CN114458934B (en) | 2022-01-14 | 2022-01-14 | Longitudinal fractal tooth connecting device for pretightening force of component and joint integrated composite material |
Country Status (1)
| Country | Link |
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| CN (1) | CN114458934B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115556370A (en) * | 2022-09-30 | 2023-01-03 | 中国人民解放军陆军工程大学 | Connecting structure and connecting method for spline-type special-shaped section composite material section bar |
| CN115614558A (en) * | 2022-09-29 | 2023-01-17 | 中国人民解放军陆军工程大学 | Novel spline type composite material connecting structure and connecting method |
| CN115923165A (en) * | 2022-09-30 | 2023-04-07 | 中国人民解放军陆军工程大学 | Extruded composite material and metal piece threaded connection structure and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115614558A (en) * | 2022-09-29 | 2023-01-17 | 中国人民解放军陆军工程大学 | Novel spline type composite material connecting structure and connecting method |
| CN115556370A (en) * | 2022-09-30 | 2023-01-03 | 中国人民解放军陆军工程大学 | Connecting structure and connecting method for spline-type special-shaped section composite material section bar |
| CN115923165A (en) * | 2022-09-30 | 2023-04-07 | 中国人民解放军陆军工程大学 | Extruded composite material and metal piece threaded connection structure and method |
| CN115923165B (en) * | 2022-09-30 | 2023-12-01 | 中国人民解放军陆军工程大学 | Extrusion-molded composite material and metal piece thread-shaped connecting structure and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114458934B (en) | 2024-03-19 |
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