CN114458934B - Longitudinal fractal tooth connecting device for pretightening force of component and joint integrated composite material - Google Patents
Longitudinal fractal tooth connecting device for pretightening force of component and joint integrated composite material Download PDFInfo
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- CN114458934B CN114458934B CN202210041964.5A CN202210041964A CN114458934B CN 114458934 B CN114458934 B CN 114458934B CN 202210041964 A CN202210041964 A CN 202210041964A CN 114458934 B CN114458934 B CN 114458934B
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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 75
- 239000002184 metal Substances 0.000 claims abstract description 75
- 238000000034 method Methods 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 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
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
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
Landscapes
- 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 component and joint integrated composite material pretightening force longitudinal fractal tooth connecting device. Comprises an outer metal sleeve, a 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 parallel to the axis of the composite material pipe, and the plurality of fractal teeth are uniformly distributed 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, after the inner metal sleeve, the composite material pipe and the outer metal sleeve are assembled in sequence, a 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 structure which aims to improve the bearing capacity of the existing composite material connecting technology and further reduce the weight of a composite material connecting part and a component.
Background
The composite material connection technology mainly comprises the following steps: the method comprises the following steps of bolt connection, cementing, glue-screw mixed connection and composite material pretightening force tooth connection. These connection techniques all suffer from certain drawbacks: for the bolt connection, the glue-screw mixed connection and the pretightening force tooth connection of the composite materials, secondary processing such as perforating or tooth punching is needed to be carried out on the composite materials at the connection part. This not only increases the cost of manufacture of the joint but also breaks the continuity of the fibers, thereby reducing the load bearing capacity of the composite joint. Although secondary processing is not needed for the composite material cementing, the colloid is secondarily solidified, so that the shearing strength of the colloid at the joint is lower, and the colloid is easy to age, so that the joint bearing capacity is not high. Meanwhile, the existing composite material connection technology only considers the connection efficiency of the connection part, and does not consider the mechanical property of the rod piece.
The patent CN201710942875.7 disclosed in the prior art has the patent name of a high-bearing and high-fatigue-performance composite material multistage pipe tooth connecting device, and the disclosed structure is as follows: an outer metal tube, an inner metal tube and a transition metal tube. The outer metal tube, the composite material tube and the inner metal tube are sequentially arranged from outside to inside; the friction force generated by tooth meshing action and/or pretightening force is transmitted among the outer metal tube, the inner metal tube and the composite material tube; wherein, teeth which are mutually meshed are arranged between the outer metal tube and the composite material tube, and/or teeth which are mutually meshed are arranged between the inner metal tube and the composite material tube; the pre-tightening force is extruded through the outer metal sleeve to enable the outer metal sleeve to deform and apply and/or enable the inner metal extrusion composite material tube to deform and apply. As an improvement, the teeth in the joint are single-stage teeth or multi-stage teeth, and fatigue performance of the joint is improved through the multi-stage teeth. However, these teeth are formed by secondary processing on the composite material, which breaks the continuity of the fibers in the composite material. The load bearing capacity of the entire joint is not fully exerted.
The patent name of the prior published patent is 'a high-load-bearing composite fractal tooth connecting device based on soft substances' (application number: 202110631498.1), and the disclosed structure is as follows: the composite board connection comprises a metal board connecting piece, a composite board, a soft substance and a pretightening force applying device: preparing multi-stage fractal teeth on the composite material plate and the metal plate, reserving gaps between the metal teeth and the composite material teeth, and determining the size of the gaps according to the rigidity of soft substances. During the assembly process, the metal teeth and the composite teeth are assembled firstly, then the gaps are filled with soft substances, and finally the pretightening force is applied through bolts on two sides of the metal plate. The patent only optimizes the composite material tooth load distribution proportion, and can solve the problem of secondary processing or secondary solidification existing in the existing composite material connection technology. In the connection mode, load is transmitted through the shearing surface of the composite material, and the interlayer shearing strength of the material determines the bearing capacity of the joint.
Meanwhile, the existing composite material pipes are all uniform in wall thickness, and in order to increase the local stability of the composite material pipes, the composite material pipes often need to be large in thickness, so that the weight of the composite material pipes is increased, and meanwhile, the bearing capacity of the composite material pipes cannot be fully exerted. This is also one of the reasons why composite tubes 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 pretightening force longitudinal fractal tooth connecting device, which is used for forming composite material fractal teeth and a composite material pipe at one time, so that secondary processing is avoided, and the connecting efficiency of a composite material connecting position is improved. The composite tube is provided with longitudinal teeth, so that load can be transmitted, the wall thickness of the composite tube can be reduced, and the weight of the connecting part and the component is further reduced.
The technical solution for realizing the purpose of the invention is as follows: a composite material pipe longitudinal fractal tooth connecting device comprises an outer metal sleeve, a 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 parallel to the axis of the composite material pipe, and the plurality of fractal teeth are uniformly distributed 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, after the inner metal sleeve, the composite material pipe and the outer metal sleeve are assembled in sequence, a 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.
Further, single-stage teeth are used instead of fractal teeth.
Further, the single-stage teeth are any one or more of trapezoidal teeth, right-angle teeth or circular arc teeth.
Further, the fractal teeth are any one or any several of secondary, tertiary and quaternary teeth.
The method for connecting by adopting the device comprises the following steps:
step (1): pultrusion of composite tubes with longitudinal fractal teeth on the inner and outer surfaces;
step (2): assembling the inner metal sleeve and the composite tube through the teeth;
step (3): the composite material pipe assembled with the inner metal sleeve is inserted into the outer metal sleeve, and after the composite material pipe is assembled, the outer metal sleeve is subjected to plastic deformation through an external extrusion device, so that pretightening force is generated.
Further, in the step (3), a pre-tightening force is applied to the assembled outer metal sleeve in a pressing 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 by one-time pultrusion, so that the secondary processing of the composite material teeth is avoided; because the composite material teeth and the composite material pipe are integrally formed, the strength of the composite material at the joint is not weakened, so that the connection efficiency of the joint is improved, and the processing cost of the composite material joint is reduced.
(2) Unlike conventional composite pretension teeth are: the composite material teeth provided by the patent of the invention are along the length direction, and the direction of the teeth of the existing composite material pretightening force is the circumferential direction; when the composite material teeth are in the circumferential direction, the composite material teeth are required 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 teeth are in the longitudinal direction, the teeth are only required to be directly inserted into the metal sleeve, so that the assembly difficulty is greatly reduced, and meanwhile, the precision requirement on the composite material teeth is not high.
(3) The joint provided by the invention transfers load through friction force, so that the larger the number of tooth fractal stages is, the larger the contact area between the composite material and the metal sleeve is, and the larger the transferred friction force is; while the traditional teeth are connected, the load is transmitted through the shearing surface of the composite material teeth; therefore, the joint provided by the invention needs to be provided with three-level or even four-level fractal teeth to increase the friction contact surface so as to improve the bearing capacity of the joint.
(4) Unlike the traditional composite material pipe tooth connection in which teeth are machined on one side of a composite material pipe, the longitudinal teeth can be independently manufactured on the inner wall and the outer wall of the composite material, and simultaneously the longitudinal teeth can be commonly manufactured on the inner wall and the outer wall of the composite material pipe; this increases the friction surface area of the composite material and thus further increases the load bearing capacity of the joint.
(5) The longitudinal teeth which are directly pulled and extruded in the pulling and extruding process can be used for assembling and connecting the composite material and the metal sleeve, and meanwhile, the geometric rigidity of the composite material pipe is increased after the longitudinal fractal teeth are arranged on the inner wall or the outer wall of the composite material pipe, so that the longitudinal teeth can be used for improving the local stability of the composite material pipe and reducing the dead weight of the composite material pipe; 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 a schematic view of the whole 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 of a composite tube of the present invention.
Fig. 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 an outer metal sleeve of the present invention.
Fig. 7 is a three-dimensional schematic view of an inner metal sleeve of the present invention.
Fig. 8 is a cross-sectional view of an inner metal sleeve of the present invention.
Fig. 9 is a schematic illustration of pretension application.
Reference numerals illustrate:
1-composite material pipe, 2 outer metal sleeve, 3-inner metal sleeve, 4-fractal tooth.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
The longitudinal fractal tooth connecting structure of the pretightening force of the composite material with the integrated design of the component and the joint is as follows: the connection includes an outer metal sleeve, an intermediate composite tube, and an inner metal tube. And simultaneously longitudinally drawing and extruding fractal teeth of the composite material along the inside of the composite material pipe in the process of drawing and extruding the composite material pipe, wherein the number of the fractal teeth and the number of the fractal stages are adjusted according to the bearing capacity of the joint. And preparing multistage 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. The composite tube assembled in the inner metal sleeve is then screwed into the outer metal sleeve. After the metal sleeve is assembled with the composite material pipe, the external metal sleeve is subjected to plastic deformation through an external extrusion device, so that pretightening force is generated.
Example 1
And the inner and outer metal sleeves are used for pultrusion of the composite material pipe. The wall thickness of the composite material pipe is 8mm, and the thickness of the inner and outer metal sleeves is 6mm. Three-stage teeth which are uniformly distributed along the circumference are prepared on the inner wall of the outer metal sleeve, and the depth of each stage of teeth is 1.5mm, 1mm and 0.5mm respectively. In order to match the local compressive load bearing capacity of the joint with the load bearing capacity of the joint, the longitudinal teeth number prepared in the circumferential direction of the outer metal sleeve is 16, and the teeth are uniformly distributed in the circumferential direction. Three-stage teeth uniformly distributed along the circumference are prepared on the outer wall of the inner metal sleeve, and the geometric dimensions of the teeth are the same as those of the outer metal sleeve. When the composite material pipe is pulled and extruded, longitudinal parting teeth matched with the inner metal sleeve and the outer metal sleeve are pulled and extruded on the inner wall and the outer wall of the composite material through a pulling and extruding process, and the composite material pipe and the inner metal sleeve and the outer metal sleeve are assembled through the longitudinal teeth of the composite material. And finally, applying pretightening force to the joint in a manner of extrusion or interference fit.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions, etc., which can be made by one skilled in the art without departing from the spirit of the present invention, are within the scope of the present invention.
Claims (6)
1. The component and joint integrated composite material pretightening force longitudinal fractal tooth connecting device is characterized by comprising an outer metal sleeve, a 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 parallel to the axis of the composite material pipe, and the plurality of fractal teeth are uniformly distributed 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, after the inner metal sleeve, the composite material pipe and the outer metal sleeve are assembled in sequence, a 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 connection device of claim 1, wherein single stage teeth are used in place of fractal teeth.
3. The connection device according to claim 2, wherein the single-stage teeth are any one or any several of trapezoidal teeth, right angle teeth or circular arc teeth.
4. The connection device according to claim 1, wherein 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 one of claims 1-4, comprising the steps of:
step (1): pultrusion of composite tubes with longitudinal fractal teeth on the inner and outer surfaces;
step (2): assembling the inner metal sleeve and the composite tube by means of teeth;
step (3): the composite material pipe assembled with the inner metal sleeve is inserted into the outer metal sleeve, and after the composite material pipe is assembled, the outer metal sleeve is subjected to plastic deformation through the outer extrusion device, so that pretightening force is generated.
6. The method of claim 5, wherein the pre-tightening force is applied to the assembled outer metal sleeve in step (3) by means of an extrusion 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 |
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| Publication Number | Publication Date |
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| CN114458934A CN114458934A (en) | 2022-05-10 |
| CN114458934B true CN114458934B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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 |
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| CN (1) | CN114458934B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115614558B (en) * | 2022-09-29 | 2023-06-09 | 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 |
| 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 |
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| CN114458934A (en) | 2022-05-10 |
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