CN111070716A - Low-temperature composite material threaded column composition forming method - Google Patents
Low-temperature composite material threaded column composition forming method Download PDFInfo
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- CN111070716A CN111070716A CN202010001146.3A CN202010001146A CN111070716A CN 111070716 A CN111070716 A CN 111070716A CN 202010001146 A CN202010001146 A CN 202010001146A CN 111070716 A CN111070716 A CN 111070716A
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Classifications
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- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/004—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore making articles by joining parts moulded in separate cavities, said parts being in said separate cavities during said joining
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- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
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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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/02—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws divided longitudinally
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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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
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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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
- F16B43/001—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts for sealing or insulation
Abstract
A low-temperature composite threaded column forming method adopts a mode of winding and forming a fiber reinforced composite material impregnated with low-temperature resin on the surface of a winding mold with threads to roughly form a hollow base body and a hollow column head of a threaded column formed by the threaded column into a structure with the threads, after demoulding, an external thread matched with the internal thread of the base body is processed on the outer side of one end of the column head, and after the base body and the column head are assembled, aerogel is filled in an inner cavity of the column head or the base body and the column head are assembled into a whole after the aerogel is filled in the inner cavity of the column head. According to the invention, multiple sections of the threaded column are respectively wound and formed to ensure the performance and adjust the height, the aerogel is filled in the inner cavity, the heat conductivity coefficient of the threaded column is greatly reduced, the condition that the deep cooling device is easy to leak cold is avoided, the energy loss is reduced, and the working efficiency of the device is improved.
Description
Technical Field
The invention relates to a method for forming a threaded column, in particular to a method for forming a composite threaded column used in a low-temperature environment, and belongs to the technical field of cryogenic heat insulation.
Background
The cryogenic heat insulation technology is an important branch in the field of cryogenic technology and is directly related to the safe operation of a cryogenic device. Besides the functional heat insulation layer, the deep cooling loop also comprises a protective plate structure, so that test products can be conveniently overhauled and conveyed. And the protective plate structure is supported by the screw thread post, consequently, requires the screw thread post to have higher low temperature resistant mechanical strength, lower coefficient of heat conductivity, and height-adjustable simultaneously has locking function again, in case structural design is unreasonable, and the material coefficient of heat conductivity does not satisfy operating mode requirement, will cause cryogenic system to leak cold, leads to cryogenic device ambient temperature to reach the requirement, increases energy loss simultaneously, reduces device work efficiency. How to form a screw thread column assembly which is resistant to low temperature, has a higher heat insulation function, and has the functions of height adjustment and looseness prevention is a problem to be solved urgently.
Like application number CN201020679503.3, the utility model patent of the name "polyurethane composite thread shape section bar" discloses a polyurethane composite thread section bar, it adopts glass fiber to constitute screw thread type section bar skeleton, compare with conventional screw thread post, it is light strong to have, energy-conserving heat preservation, thermal-insulated, healthy, green, energy-conserving effect is showing, corrosion-resistant, ageing-resistant, longe-lived, dimensional stability is good, weather resistance is good, high temperature resistant, low temperature resistance is good, insulating properties is good, damping properties is good, advantages such as rich in color.
As another example, the utility model patent with the name of "a plastic part including a threaded column, a plastic component" of application No. CN201520807716.2 discloses a plastic threaded column, wherein the threaded column is arranged between the plastic parts as a connecting component, compared with the prior art, the depth of the threaded hole in the threaded column of the plastic part of the utility model is smaller, which is convenient for product forming and can conveniently and reliably realize the screw fastening connection between two parts with larger distance; the inner surface and the outer surface of the lower part of the threaded column are not demoulded in the same direction, so that the connecting part between the root of the threaded column and the plastic part is not thick, the structure is simple, the required die is simple during preparation, and the cost is low.
As another example, the invention patent with the application number CN201510018364.7, entitled "method for manufacturing internal threads of carbon fiber pipe" discloses a method for manufacturing internal threads of carbon fiber pipe, which comprises the steps of firstly manufacturing a core mold, winding a BOPP tape on the core mold, and forming an inverted triangle on the core mold; winding a layer of carbon fiber cloth on a BOPP belt by using high tension, spraying or brushing a release agent, and then placing for 30-60min, wherein the purpose of high tension winding is to enable the first layer of carbon fiber cloth to better form internal threads, the purpose of brushing the release agent is to uniformly form films, and the later-stage demolding is easy. Winding: winding the carbon fiber cloth on the first layer of carbon fiber cloth to manufacture a carbon fiber tube; and (3) curing: heating and curing at the temperature of 130-150 ℃; and (4) core pulling, wherein core pulling is carried out at the temperature of 50-70 ℃.
Also, as the invention patent of application No. CN200810227277.2 entitled "a composite material internal thread forming method", a composite material internal thread forming method is disclosed, in which a non-woven fabric impregnated with resin is circumferentially wound on the surface of a core mold thread part; coating a resin matrix mixed with inorganic material whiskers on a circumferentially wound non-woven fabric layer, wherein the height of the resin is not lower than the tooth tops of the threads of the die; paving reinforced unidirectional fiber cloth on the surface of the core mold along the annular direction, wherein the fiber direction of the reinforced unidirectional fiber cloth is consistent with the radial direction of the core mold and does not exceed 1/3 of the tooth height; winding the reinforced hoop winding fiber on the surface of the unidirectional fiber cloth in a hoop direction, wherein the bandwidth is not more than the thread pitch; spirally winding the tube body fibers to a required thickness; curing and demolding; the structure is characterized in that the inner thread of the composite material pipeline is formed by a method of combining unidirectional cloth and circumferential winding of reinforcing fibers, so that the reinforcing fibers can be reasonably distributed on the thread tooth part along the bearing direction, the function of reinforcing a resin matrix is achieved, and the inner thread part in threaded connection has enough strength.
Although the screw post composition and the screw thread forming method in the above documents are different from the current general technology, the heat insulation performance and the low temperature resistance of the screw post composition can not meet the requirements of the cryogenic heat insulation technology, and therefore, a special forming method is needed to prepare the low temperature screw post composition which meets the requirements of the cryogenic environment.
Disclosure of Invention
The invention provides a method for forming a low-temperature composite threaded column assembly with low thermal conductivity, high low-temperature resistance and mechanical strength, and simultaneously has the functions of height adjustment and looseness prevention, and aims to solve the problems that the current threaded column assembly cannot meet the use requirement in a cryogenic environment, is high in thermal conductivity and poor in low-temperature resistance and is easy to leak cold.
The technical means adopted by the invention to solve the problems are as follows: a low-temperature composite threaded column assembly forming method adopts a mode of winding and forming a fiber reinforced composite material impregnated with low-temperature resin on the surface of a winding mold with threads to roughly form a hollow base body and a hollow column head of a threaded column in the threaded column assembly into a structure with the threads, after demoulding, an external thread matched with the internal thread of the base body is processed on the outer side of one end of a column head, and after the base body and the column head are assembled, aerogel is filled in an inner cavity of the column head or the base body and the column head are assembled into a whole after the aerogel is filled in the inner cavity of the column head.
Further, the seat body and the column cap are formed by winding glass fiber yarns, the yarns adopt 240-2400tex, the width of a wound yarn sheet is a screw pitch, a winding angle is a screw thread spiral angle, the winding tension is 60-120N, the resin content is 25% -35%, the winding speed is 0.1-0.3m/s, the resin gel is continuously rotated until the resin gel is formed after the resin gel is wound to the required thickness, and the resin gel is stripped on a stripper after the resin gel is cured and formed.
Further, the yarn adopts 360-960tex, and the winding tension is 80-100N.
Further, low-temperature anti-loosening glue is coated on the external thread of the column head before the seat body and the column head are assembled, and aerogel is coated on the outer wall of the threaded column after the seat body and the column head are assembled.
Further, the column cap is designed to adjust the height of the column cap in a mode that the middle threaded column and the upper threaded column are in threaded connection.
Furthermore, square clamping grooves are machined in the outer surfaces, far away from the outer threaded column side, of the middle threaded column and the upper threaded column.
Furthermore, after the gasket formed by the threaded columns is molded by adopting a fiber reinforced composite material impregnated with low-temperature resin, grooves are processed on the surfaces of the gasket, and the grooves are filled with aerogel.
And further, after the aerogel filled in the groove is 1-2mm higher than the upper surface of the disc, placing the gasket between the threaded column and the workpiece.
Furthermore, the gasket is molded by adopting glass fiber cloth, and the specification of the glass fiber cloth is 80-200g/m2。
Further, the specification of the glass fiber cloth is 100-150 g/m2。
The invention has the beneficial effects that:
1. the invention sets the threaded column into multi-section threaded connection, can adjust the overall height of the threaded column according to the requirement when in use, can meet different height requirements, improves the application range, and avoids cutting fibers during separate processing because the internal threads are integrally formed, thereby having excellent comprehensive performance.
2. According to the invention, the threaded column is set to be of a structure that aerogel is filled in the fiber reinforced composite material, so that the heat conductivity coefficient of the threaded column is greatly reduced, the condition that a deep cooling device is easy to leak cold is avoided, the energy loss is reduced, and the working efficiency of the device is improved.
3. According to the invention, the gasket is arranged into a structure with the groove, so that the heat conductivity coefficient is further reduced, the heat insulation function is improved, the heat loss is avoided, the looseness is prevented, the aerogel is 1-2mm higher than the surface of the disc when the groove is filled with the aerogel, and the aerogel is compressed through extrusion between the threaded column and the workpiece when the gasket is arranged between the threaded column and the workpiece, so that the aerogel is arranged more compactly, the strength of the gasket is improved, and the heat insulation performance of the gasket is improved.
4. According to the invention, the square clamping grooves are formed in the outer sides of the middle threaded column and the upper threaded column, so that the overall height of the threaded column can be conveniently adjusted.
Drawings
FIG. 1 is a schematic structural view of an embodiment;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of a square slot formed on the outer sides of the middle threaded post and the upper threaded post according to the first embodiment;
FIG. 4 is a schematic front view of a gasket according to the first and second embodiments;
FIG. 5 is a left side view of a gasket structure according to an embodiment;
FIG. 6 is a left side view of a second gasket structure of the embodiment;
FIG. 7 is a schematic front view of a third embodiment and a fourth embodiment of a gasket construction;
FIG. 8 is a schematic cross-sectional view of a three-shim structure according to an embodiment;
FIG. 9 is a schematic cross-sectional view of a four-shim structure according to an embodiment;
in the figure: 1. the fixing plate comprises a fixing plate, 2 parts of a gasket, 21 parts of a groove, 3 parts of a seat body, 4 parts of a column head, 41 parts of a middle threaded column, 42 parts of an upper threaded column and 43 parts of a square clamping groove.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A low-temperature composite material threaded column composition forming method, as shown in fig. 1 and fig. 2, in this embodiment, a threaded column composed of threaded columns is designed to be a structure in which a seat body 3 and a column cap 4 are connected, and the column cap 4 is also designed to be a structure in which a middle threaded column 41 and an upper threaded column 42 are connected, the seat body 3, the middle threaded column 41 and the upper threaded column 42 are both hollow cylinders, one end of an internal cavity of the seat body 3 is provided with an annular boss, the inner peripheral surface of the annular boss is provided with internal threads to fix the whole threaded column composition on a fixing plate 1, and the inner peripheral surface of the seat body 3 at the end opposite to the boss is also provided with; the outer peripheral surface of one end of the middle threaded column 41 is provided with an external thread which is connected with the seat body 3 through the adjustable height of the thread, and the inner peripheral surface of the other end is provided with an internal thread; the outer peripheral surface of one end of the upper threaded column 42 is provided with an external thread which is connected with the middle threaded column 41 in a height-adjustable mode through threads.
In this embodiment, the seat body 3, the middle threaded column 41 and the upper threaded column 42 are formed by winding the glass fiber yarn in the fiber reinforced composite material on the surface of a winding mold with threads. Firstly, impregnating glass fiber yarns in low-temperature resin, and then respectively winding the impregnated yarns on a numerical control winding device on dies of a seat body 3, a middle threaded column 41 and an upper threaded column 42, wherein the impregnated yarns adopt 240-2400tex, preferably 360-960tex, the width of a wound yarn sheet is a thread pitch, the winding angle is a thread spiral angle, the winding tension is 60-120N, preferably 80-100N, the resin content is 25-35%, and the winding speed is 0.1-0.3 m/s; and (3) continuously rotating until the resin gel is formed after the resin gel is wound to the required thickness, conveying the resin gel into a curing furnace for curing and forming to form a blank, demoulding the blank on a demoulding machine, respectively processing the size of the blank, and processing external threads by using one of diamond and hard alloy cutters. And brushing low-temperature anti-loosening glue on the external threads of the middle threaded column 41 and the upper threaded column 42, and matching the seat body 3, the middle threaded column 41 and the upper threaded column 42 to the required height. In the step, yarns are wound on the die for forming, so that the trend of fibers in the threaded column is favorably controlled, and the strength of the threaded column is ensured; the low-temperature anti-loosening glue is coated on the external threads of the middle threaded column 41 and the upper threaded column 42, so that the base body 3, the middle threaded column 41 and the upper threaded column 42 are not easy to loosen after being integrally formed, and the performance of the threaded columns is improved. Filling aerogel in the inner cavity of the matched threaded column, adopting a mode of pasting cloth layer by layer until the inner cavity is filled, coating aerogel on the outer wall of the threaded column, wherein the thickness of the aerogel is 5-7 layers, and finally bonding the aerogel by using low-temperature glue. The fiber reinforced composite material is used as the framework of the threaded column to provide strength support, the framework is separated from the surrounding environment by the aerogel with good heat insulation performance inside and outside the framework, the heat insulation performance of the threaded column is greatly improved, and the maintenance of the low-temperature environment in a cryogenic loop is facilitated.
As shown in fig. 3, a diamond or hard alloy tool is used to machine a square slot 43 on the outer side of the non-external thread of the middle threaded column 41 and the upper threaded column 42, the number and size of the square slot 43 can be selected according to the structure of the threaded column, when the height of the threaded column needs to be adjusted, the middle threaded column 41 or the upper threaded column 42 can be conveniently screwed in or screwed out at the square slot 43 by means of clamping with a tool, and the problem of possible slippage when directly clamped on a cylindrical surface is avoided.
Gasket 2Molding by adopting a glass fiber cloth mold pressing method in the fiber reinforced composite material, wherein the specification of the glass fiber cloth is 80-200g/m2Preferably 100-150 g/m2. As shown in fig. 4 and 5, in this embodiment, the gasket 2 is designed to have grooves 21 with tooth structures at equal intervals on a ring surface, after an annular disc is molded, the grooves 21 at equal intervals are processed on the ring surface by using one of diamond and hard alloy tools, aerogel is attached to the grooves 21 until the thickness of the aerogel is 1-2mm higher than the annular upper surface of the gasket, and when the threaded column assembly is fixed to the fixing plate 1, the gasket 2 is pressed by the threaded column and the fixing plate 1 to compress the aerogel and fill the grooves 21. Design into gasket 2 and have recess 21 and fill the structure of aerogel in recess 21, because the thermal insulation performance of aerogel is greater than fiber reinforced composite's thermal insulation performance far away, can improve gasket 2's thermal insulation performance under the prerequisite of proof strength, further reduce the speed that the heat got into in the cryrogenic return circuit, reduced the energy consumption, and with the equidistant tooth structural design of recess 21, convenient processing is favorable to improving gasket 2's production speed. This embodiment adopts the mode of two-layer gasket 2 stack when using, and with two-layer gasket 2 syntropy, recess 21 be the vertical state stack, with the fibre reinforced composite cross contact of two-layer gasket 2, separate as far as possible, both guaranteed gasket 2's intensity, also further reduce thermal transmission, improve the adiabatic performance that the screw thread post is constituteed.
The following examples are given by way of example according to actual experimental conditions.
Example one
In this embodiment, the raw material for preparing the threaded column is 360tex glass fiber yarn, and the molding mode is: winding 360tex glass fiber yarn with low temperature resin on the thread mold of the upper thread column under the tension of 80-100N, the width of the yarn sheet being the thread pitch length, the resin content being 25-27%, the winding speed being 0.1-0.2m/s, winding to the required thickness, continuing rotating to gel, and curing in a curing furnace at the curing temperature of 90 ℃ for 2h +110 ℃ for 2 h. And (3) processing external threads by adopting a diamond cutter after demoulding to obtain the upper threaded column 42, wherein the process method of the middle threaded column 41 and the base body 3 is the same as that of the upper threaded column.
As shown in fig. 4 and 6, the gasket 2 is designed to have a structure in which the grooves 21 of the tooth structure with equal intervals are formed on the ring surfaces of both sides, and the grooves 21 are filled with aerogel, and the grooves 21 of both sides are formed in the same manner in fig. 6, or the grooves 21 of both sides of the gasket 2 may be formed perpendicular to each other. At this time, the thickness of the gasket 2 can be set to be larger than that of the gasket 2 in the first embodiment according to needs, and only one gasket 2 is used in one threaded column assembly, and of course, the actual specification size and the number of the gaskets 2 can be adjusted according to the use environment.
Example two
In this embodiment, the raw material for preparing the threaded column is 960tex glass fiber yarn, and the molding method is as follows: winding 960tex glass fiber yarn with low temperature resin on the thread mold of the upper thread column under tension of 80-100N, with the width of the yarn sheet being the thread pitch length, the resin content of 30-32% and the winding speed of 0.2-0.3m/s, winding to the required thickness, rotating continuously to gel, and curing in a curing furnace at 90 deg.C for 2h +110 deg.C for 2 h. And (3) processing external threads by adopting a diamond cutter after demoulding to obtain the upper threaded column 42, wherein the process method of the middle threaded column 41 and the base body 3 is the same as that of the upper threaded column.
As shown in fig. 7 and 8, a groove 21 is formed on one side of the gasket 2, and aerogel is filled in the groove 21, wherein the groove 21 is formed by: the extension lines of the central lines of all the grooves 21 pass through the circle center, and all the grooves 21 are arranged symmetrically and identically, so that the strength of all the parts of the gasket 2 is ensured, and the processing and the assembly are convenient. When the gasket is used, a mode of overlapping two layers of gaskets 2 can be adopted, and the positions of the grooves 21 of the two layers of gaskets 2 are overlapped in the same mode, so that the strength is ensured.
The applicant compares the performance of the threaded column formed in the above embodiment with that of a conventional threaded column with internal threads machined subsequently:
| material | Internal thread forming mode | Ballast power (KN) | Side ballast force (KN) | Fatigue test |
| 360tex yarn | One-step winding forming | 56.2 | 5.9 | By passing |
| 960tex yarn | One-step winding forming | 52.1 | 5.2 | By passing |
| 360tex yarn | Secondary working | 51.8 | 5.1 | Do not pass through |
| 960tex yarn | Secondary working | 47.3 | 4.6 | Do not pass through |
Through the comparative test, the threaded column formed by one-time winding has higher compressive strength and stronger fatigue resistance.
EXAMPLE III
As shown in fig. 7 and 9, in this embodiment, the gasket 2 is provided with the grooves 21 on both sides, the grooves 21 are filled with aerogel, and the positions of the grooves 21 on both sides are correspondingly arranged to ensure the strength of the gasket 2.
Example four
In this embodiment, the head 4 of the threaded column may be provided as a whole, that is, the threaded column is not formed by three segments as in the embodiment, but is connected by two segments of threads, and at this time, the heights of the seat body 3 and the head 4 are increased compared with each segment in the embodiment. Of course, the number of the sections of the threaded column can be selected according to the actual use condition, and the structure and the connection relationship between each section are the same as those described in the first embodiment.
It should be noted that the low-temperature resin and the low-temperature glue and the low-temperature anti-loosening glue used in the present invention are not specific to a certain resin or glue, and all resins or glues capable of being used in a low-temperature environment and maintaining performance can be used, and the low-temperature environment is not specific to a certain temperature, but refers to a temperature range involved in the current cryogenic technology, and can be as low as-196oC。
The above embodiments are provided for illustrative purposes only and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should fall within the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (10)
1. A low-temperature composite material threaded column composition forming method is characterized in that: the method comprises the steps of roughly forming a hollow seat body and a hollow column head of a threaded column in a threaded column assembly into a structure with internal threads in a mode of winding and forming the surface of a winding mold with the threads by using fiber reinforced composite material impregnated with low-temperature resin, demoulding, processing external threads matched with the internal threads of the seat body on the outer side of one end of the column head, filling aerogel in an inner cavity of the column head after the seat body and the column head are assembled, or assembling the seat body and the column head into a whole after the aerogel is filled in the inner cavity of the column head.
2. The method for compositely forming a threaded column of cryogenic composite material according to claim 1, wherein: the seat body and the column cap are formed by winding glass fiber yarns, the yarns adopt 240 plus 2400tex, the width of a wound yarn sheet is a screw pitch, a winding angle is a screw thread spiral angle, the winding tension is 60-120N, the resin content is 25% -35%, the winding speed is 0.1-0.3m/s, the resin gel is continuously rotated until the resin gel is wound to the required thickness, and the resin gel is removed on a demoulding machine after curing and forming.
3. The method for compositely forming a threaded column of cryogenic composite material according to claim 2, wherein: the yarn adopts 360-960tex and the winding tension is 80-100N.
4. The method for compositely forming a threaded column of cryogenic composite material according to claim 1, wherein: and low-temperature anti-loosening glue is coated on the external thread of the column head before the seat body and the column head are assembled, and the outer wall of the threaded column is also coated with aerogel after the assembly.
5. The method for compositely forming a threaded column of cryogenic composite material according to claim 1, wherein: the column cap is designed in a way that the height of the column cap is adjusted by the way that the middle threaded column and the upper threaded column are in threaded connection.
6. The method for compositely forming a threaded column of cryogenic composite material according to claim 5, wherein: and square clamping grooves are processed on the outer surfaces of the middle threaded column and the upper threaded column far away from the side of the external threaded column.
7. The method for compositely forming a threaded column of cryogenic composite material according to claim 1, wherein: after the gasket formed by the threaded columns is molded by adopting a fiber reinforced composite material impregnated with low-temperature resin, a groove is processed on the surface of the gasket, and aerogel is filled in the groove.
8. The method for compositely forming a threaded column of cryogenic composite material according to claim 7, wherein: and after the aerogel filled in the groove is 1-2mm higher than the upper surface of the disc, placing the gasket between the threaded column and the workpiece.
9. The method for compositely forming a threaded column of cryogenic composite material according to claim 7, wherein: the gasket is molded by glass fiber cloth in a compression molding way, and the specification of the glass fiber cloth is 80-200g/m2。
10. The method for compositely forming a threaded column of cryogenic composite material according to claim 9, wherein: the specification of the glass fiber cloth is 100-150 g/m2。
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| CN111070716B (en) | 2022-03-18 |
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