CN112339355A - Thermoplastic composite nut and preparation method and application thereof - Google Patents
Thermoplastic composite nut and preparation method and application thereof Download PDFInfo
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- CN112339355A CN112339355A CN202011057492.XA CN202011057492A CN112339355A CN 112339355 A CN112339355 A CN 112339355A CN 202011057492 A CN202011057492 A CN 202011057492A CN 112339355 A CN112339355 A CN 112339355A
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- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 47
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 78
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 42
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- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 4
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- 239000004952 Polyamide Substances 0.000 claims description 3
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- 239000004760 aramid Substances 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract 1
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Images
Classifications
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
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- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/263—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer having non-uniform thickness
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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
- F16B37/00—Nuts or like thread-engaging members
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- B32B2262/10—Inorganic fibres
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/554—Wear resistance
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The disclosure relates to a thermoplastic composite material connecting part, in particular to a thermoplastic composite nut and a preparation method and application thereof. The thermoplastic composite nut is formed by compounding three annular laminations from inside to outside, and is respectively an internal rigid ring, a middle transition reinforced support ring and a surface hybrid fiber reinforced structure ring; the method comprises the steps of laminated one-time plasticizing molding and integral two-time plasticizing molding, wherein the inner surface of an internal rigid ring is prepared by plasticizing molding of high-modulus carbon fiber and polyethylene which are wound in two dimensions; the middle transition reinforcing support ring is prepared by carbon fiber reinforcement along the axial direction of the nut and plasticizing and molding of propylene resin; the surface hybrid fiber reinforced structural ring is prepared by plasticizing and molding hybrid carbon fibers, high-toughness fibers and thermoplastic polyester resin; the integral secondary plasticizing molding is that three annular laminated layers are arranged according to the internal and external structures and then are plasticized and molded to obtain the composite material. The problem of among the prior art thermosetting resin nut difficult secondary recycle, and can't prepare the nut that obtains composite construction, influence nut mechanical properties is solved.
Description
Technical Field
The disclosure relates to a thermoplastic composite material connecting part, in particular to a thermoplastic composite nut and a preparation method and application thereof.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Nuts and bolts are common fastening devices, most of nuts and bolts in the prior art are made of metal materials, but the metal nuts and bolts have the problem of easy looseness due to high rigidity, and are easy to corrode and difficult to detach due to long-time inactivity.
In order to solve the problem, the prior art provides a method for preparing a nut by using thermosetting plastics, and resin has certain fluidity relative to metal, so that the resin is more easily combined with the metal, the tightness of the resin and the metal is better, and the resin is not easy to loosen.
Disclosure of Invention
The nut solves the problems that in the prior art, a thermosetting resin nut is not easy to recycle secondarily, and the nut with a composite structure cannot be prepared, so that the mechanical property of the nut is influenced.
In one or some embodiments of the present disclosure, a thermoplastic composite nut is provided, which comprises, in order from inside to outside, a surface thread layer, an internal rigid ring, a middle transition reinforcing support ring, and a hybrid fiber reinforcing ring;
the surface thread layer is a carbon fiber composite thermoplastic resin layer, and the inner surface of the surface thread layer is of a thread structure;
the main body of the inner rigid ring is made of high-modulus carbon fibers along the axial direction of the nut;
the main body of the middle transition reinforcing support ring is made of high-strength carbon fibers along the axial direction of the nut;
the hybrid fiber reinforced ring is composed of a thermoplastic resin and hybrid fibers.
In one or some embodiments of the present disclosure, a method for preparing a thermoplastic composite nut is provided, wherein the thermoplastic composite nut is compounded by three annular laminated layers from inside to outside, namely an internal rigid ring, a middle transition reinforced support ring and a surface hybrid fiber reinforced structure ring;
comprises the steps of laminated one-time plasticizing molding and integral two-time plasticizing molding,
the laminated layer is subjected to one-step plasticizing molding, namely three annular laminated layers are subjected to plasticizing molding by resin, carbon fiber or hybrid fiber, and particularly, the inner surface of the internal rigid ring is subjected to plasticizing molding by adopting high-modulus carbon fiber and polyethylene which are wound in two dimensions; the main body of the inner rigid ring is reinforced by high-modulus carbon fibers arranged along the axial direction,
the middle transition reinforcing support ring is prepared by carbon fiber reinforcement along the axial direction of the nut and plasticizing and molding of propylene resin;
the surface hybrid fiber reinforced structural ring is prepared by plasticizing and molding hybrid carbon fibers, high-toughness fibers and thermoplastic polyester resin;
the integral secondary plasticizing molding is that three annular laminated layers are arranged according to the internal and external structures and then are plasticized and molded to obtain the composite material.
In one or some embodiments of the present disclosure, a thermoplastic composite nut made by the above-described method of making a thermoplastic composite nut is provided.
In one or more embodiments of the present disclosure, a fastening device is provided, comprising the thermoplastic composite nut and a bolt as described above, the bolt having threads corresponding to the surface thread layer threads.
One or some of the above technical solutions have the following advantages or beneficial effects:
1) according to the composite nut, the thermoplastic material and the carbon fiber are compounded to prepare the composite nut, the problem that the thermosetting composite material is difficult to recover for the second time is solved, the carbon fiber is added into the thermoplastic material for compounding, and the mechanical property of the composite nut is greatly improved.
2) The present disclosure provides a method for manufacturing a thermoplastic composite nut, the structure of which comprises the following parts: an internal rigid ring, a middle transition reinforced support ring and a surface hybrid fiber reinforced structure ring. The inner surface of the inner rigid ring is annularly wound with carbon fiber reinforced thermoplastic resin, the inner surface of the inner rigid ring can be subjected to secondary thread machining, and the main body of the inner rigid ring is arranged by high-modulus carbon fibers along the axial direction of the nut, so that rigid support is provided for the whole nut; the middle transition reinforced support ring is arranged by adopting high-strength carbon fibers along the axial direction of the nut, and is subjected to composite processing by taking thermoplastic resin as a matrix; the surface hybrid fiber reinforced structure ring is reinforced by mixing high-strength carbon fiber and high-toughness fiber, and is compositely processed by taking thermoplastic resin as a matrix. The three layers of different fibers are reinforced in different arrangement modes, and meanwhile, the composite material nut prepared by compounding the thermoplastic resin matrix has multiple mechanical and mechanical properties such as light weight, high rigidity, high strength, friction resistance and the like, and can be conveniently used as a key application product for replacing metal parts to become a composite material structural connecting part.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and, together with the description, serve to explain the disclosure and not to limit the disclosure.
FIG. 1 is a cross-sectional view of the structure of the thermoplastic composite nut of examples 1-4.
Wherein, 1, an inner rigid ring; 2. a middle transition reinforcing support ring; 3. surface hybrid fiber reinforced structural rings; 4. a surface thread layer.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the disclosure without making any creative effort, shall fall within the protection scope of the disclosure.
The nut solves the problems that in the prior art, a thermosetting resin nut is not easy to recycle secondarily, and the nut with a composite structure cannot be prepared, so that the mechanical property of the nut is influenced.
In one or some embodiments of the present disclosure, a thermoplastic composite nut is provided, which comprises, in order from inside to outside, a surface thread layer, an internal rigid ring, a middle transition reinforcing support ring, and a hybrid fiber reinforcing ring;
the surface thread layer is a carbon fiber composite thermoplastic resin layer, and the inner surface of the surface thread layer is of a thread structure;
the main body of the inner rigid ring is made of high-modulus carbon fibers along the axial direction of the nut;
the main body of the middle transition reinforcing support ring is made of high-strength carbon fibers along the axial direction of the nut;
the hybrid fiber reinforced ring is composed of a thermoplastic resin and hybrid fibers.
Preferably, the inner surface of the inner rigid ring is circumferentially wound with carbon fibers, the fibers being wound in a two-dimensional winding arrangement
Preferably, the two-dimensional winding arrangement comprises hoop winding, spiral winding and longitudinal winding.
Preferably, wherein the winding angle of the hoop winding is controlled within the range of 85-90 °; the winding angle of the spiral winding is controlled to be 45-70 degrees; the winding angle of the longitudinal winding does not exceed 25 deg..
Preferably, the high modulus carbon fiber comprises M40, M40J, M55, M55J, M60, M60J.
Preferably, the high-strength carbon fiber is any one of T300, T700, T800 and T1000 carbon fiber;
preferably, the hybrid fibers comprise high strength carbon fibers and high tenacity fibers, wherein the high strength carbon fibers comprise T300, T700, T800, T1000 carbon fibers and the high tenacity fibers comprise aramid fibers, UHMWPE fibers, PBO fibers.
Preferably, the thermoplastic resin includes polyethylene, polypropylene, polycarbonate, thermoplastic polyester, polyphenylene sulfide, polyether ether ketone, polyether ketone, polyamide, polyimide.
In one or some embodiments of the present disclosure, a method for preparing a thermoplastic composite nut is provided, wherein the thermoplastic composite nut is compounded by three annular laminated layers from inside to outside, namely an internal rigid ring, a middle transition reinforced support ring and a surface hybrid fiber reinforced structure ring;
comprises the steps of laminated one-time plasticizing molding and integral two-time plasticizing molding,
the laminated layer is subjected to one-step plasticizing molding, namely three annular laminated layers are subjected to plasticizing molding by resin, carbon fiber or hybrid fiber, and particularly, the inner surface of the internal rigid ring is subjected to plasticizing molding by adopting high-modulus carbon fiber and polyethylene which are wound in two dimensions; the main body of the inner rigid ring is reinforced by high-modulus carbon fibers arranged along the axial direction,
the middle transition reinforcing support ring is prepared by carbon fiber reinforcement along the axial direction of the nut and plasticizing and molding of propylene resin;
the surface hybrid fiber reinforced structural ring is prepared by plasticizing and molding hybrid carbon fibers, high-toughness fibers and thermoplastic polyester resin;
the integral secondary plasticizing molding is that three annular laminated layers are arranged according to the internal and external structures and then are plasticized and molded to obtain the composite material.
Preferably, the inner surface of the inner rigid ring is annularly wound with carbon fiber, which can be selected from any one of M40, M40J, M55, M55J, M60 and M60J,
or the two-dimensional winding arrangement mode comprises hoop winding, spiral winding and longitudinal winding, wherein the winding angle of the hoop winding is controlled within the range of 85-90 degrees, the winding angle of the spiral winding is controlled within the range of 45-70 degrees, and the winding angle of the longitudinal winding is not more than 25 degrees.
Preferably, the whole of the whole inner rigid ring takes thermoplastic resin as a matrix, and the matrix content of the whole rigid ring is controlled within the range of 40-60%, and is flexibly adjusted according to design requirements.
Preferably, the thermoplastic resin matrix of the inner rigid ring comprises one or more of polyethylene, polypropylene, polycarbonate, thermoplastic polyester, polyphenylene sulfide, polyether ether ketone, polyether ketone, polyamide and polyimide.
Preferably, the middle transition reinforced support ring is arranged by adopting high-strength carbon fibers along the axial direction of the nut, and is subjected to composite processing by taking thermoplastic resin as a matrix;
preferably, the high-strength carbon fibers include T300, T700, T800, T1000 carbon fibers;
or, the thermoplastic resin matrix of the middle transition reinforced support ring comprises one or more of polyethylene, polypropylene, polycarbonate, thermoplastic polyester, polyphenylene sulfide, polyether ether ketone, polyether ketone, polyamide and polyimide;
or the matrix content of the whole intermediate transition reinforcing support ring is controlled within the range of 40-60%, and the matrix content can be flexibly adjusted according to the design requirement.
Preferably, the surface hybrid fiber reinforced structural ring is subjected to hybrid reinforcement by adopting high-strength carbon fibers and high-toughness fibers, is subjected to composite processing by taking thermoplastic resin as a matrix,
preferably, the high-strength carbon fiber comprises T300, T700, T800 and T1000 carbon fibers, the high-toughness fiber comprises aramid fiber, UHMWPE fiber and PBO fiber, the mixing ratio of the two fibers can be flexibly adjusted according to the design requirement,
or, the thermoplastic resin matrix of the surface hybrid fiber reinforced structural ring comprises one or more of polyethylene, polypropylene, polycarbonate, thermoplastic polyester, polyphenylene sulfide, polyether ether ketone, polyether ketone, polyamide and polyimide,
or, the resin matrix content is controlled within the range of 40-60%.
Preferably, the integral secondary plasticizing molding comprises the following specific steps:
arranging the three annular laminated layers according to the inner and outer structures, placing the three annular laminated layers in a nut mold with a certain cavity for thread secondary plasticizing processing, heating according to the hot melting plasticizing property of a resin matrix, pressurizing the resin matrix after the temperature reaches the resin hot melting temperature of the nut, and taking out a nut sample after the mold is cooled;
preferably, the plasticizing temperature is controlled within the range of 180-290 ℃, the pressurizing pressure is controlled within the range of 2-8MPa, and the time for secondary plasticizing thread processing is controlled within the range of 2-5 hours.
In one or some embodiments of the present disclosure, a thermoplastic composite nut made by the above-described method of making a thermoplastic composite nut is provided.
In one or more embodiments of the present disclosure, a fastening device is provided, comprising the thermoplastic composite nut and a bolt as described above, the bolt having threads corresponding to the surface thread layer threads.
Preferably, the bolt is a metal bolt.
Example 1
As shown in fig. 1, the present embodiment provides a method of making a thermoplastic composite nut comprising an inner rigid ring, an intermediate transition reinforcement support ring, and a surface hybrid fiber reinforcement structural ring.
The inner surface of the inner rigid ring is formed by polyethylene with 40% of high-modulus carbon fiber reinforcement content of M40 wound in two dimensions, wherein the winding mode can be a hoop winding mode with a winding angle controlled at 85 degrees; the body of the inner rigid ring is made of polyethylene resin with a high modulus carbon fiber reinforcement content of 60% of M60J arranged axially.
The middle transition reinforcing support ring is made of polypropylene resin with the T300 carbon fiber reinforcing content of 45% along the axial direction of the nut.
The surface hybrid fiber reinforced structure ring is formed by mixing T300 carbon fiber and K49 aramid fiber in a ratio of 1:1, and the resin matrix of the surface hybrid fiber reinforced structure ring is thermoplastic polyester resin with the content of 55%.
After the laminated structure is plasticized and molded, the laminated structure is placed in a nut mold with a certain cavity for secondary plasticizing processing of threads, heating is carried out according to the hot melting plasticizing characteristic of a resin matrix, after the temperature reaches the resin hot melting temperature of the nut, the nut is pressurized, wherein the plasticizing temperature is controlled within 220 ℃, the pressurizing pressure is controlled within 3MPa, the secondary plasticizing thread processing time is controlled within 3 hours, and after the mold is cooled, a nut sample is taken out.
Example 2
As shown in fig. 1, the present embodiment provides a method of making a thermoplastic composite nut comprising an inner rigid ring, an intermediate transition reinforcement support ring, and a surface hybrid fiber reinforcement structural ring.
The inner surface of the inner rigid ring is formed by two-dimensionally winding M40J high-modulus carbon fiber reinforced polyimide resin with the content of 50%, wherein the winding mode can be a spiral winding mode with the winding angle controlled at 45 degrees; the body of the inner rigid ring was constructed of an axially aligned polycarbonate resin with a 54% high modulus carbon fiber reinforcement content of M60.
The middle transition reinforcing support ring is made of polyamide resin with T1000 carbon fiber reinforcing content of 50% along the axial direction of the nut.
The surface hybrid fiber reinforced structure ring is composed of T700 carbon fibers and UHMWPE fibers in a hybrid ratio of 3:1, and the resin matrix of the surface hybrid fiber reinforced structure ring is polyphenylene sulfide resin with a content of 45%.
After the laminated structure is plasticized and molded, the laminated structure is placed in a nut mold with a certain cavity for secondary plasticizing processing of threads, heating is carried out according to the hot melting plasticizing characteristic of a resin matrix, after the temperature reaches the resin hot melting temperature of the nut, the nut is pressurized, wherein the plasticizing temperature is controlled within the range of 280 ℃, the pressurizing pressure is controlled within the range of 4MPa, the secondary plasticizing processing time of the threads is controlled within the range of 4 hours, and after the mold is cooled, a nut sample is taken out.
Example 3
As shown in fig. 1, the present embodiment provides a method of making a thermoplastic composite nut comprising an inner rigid ring, an intermediate transition reinforcement support ring, and a surface hybrid fiber reinforcement structural ring.
The inner surface of the inner rigid ring is formed by two-dimensionally winding M55 high-modulus carbon fiber reinforced polyether ether ketone resin with the content of 52%, wherein the winding mode can be a longitudinal winding mode with the winding angle not more than 25 degrees; the main body of the inner rigid ring is made of polyphenylene sulfide resin with 55% of high-modulus carbon fiber reinforcement content of M55 which is axially arranged.
The middle transition reinforcing support ring is made of polyether ketone resin with the reinforcing content of T800 carbon fibers of 48 percent along the axial direction of the nut.
The surface hybrid fiber reinforced structure ring is composed of T800 carbon fiber and PBO fiber in a hybrid ratio of 4:1, and a resin matrix of the surface hybrid fiber reinforced structure ring is made of polyimide resin with a content of 60%.
After the laminated structure is plasticized and molded, the laminated structure is placed in a nut mold with a certain cavity for secondary plasticizing processing of threads, heating is carried out according to the hot melting plasticizing characteristic of a resin matrix, after the temperature reaches the resin hot melting temperature of the nut, the nut is pressurized, wherein the plasticizing temperature is controlled within 290 ℃, the pressurizing pressure is controlled within 8MPa, the secondary plasticizing thread processing time is controlled within 5 hours, and after the mold is cooled, a nut sample is taken out.
Example 4
As shown in fig. 1, the present embodiment provides a method of making a thermoplastic composite nut comprising an inner rigid ring, an intermediate transition reinforcement support ring, and a surface hybrid fiber reinforcement structural ring.
Wherein the inner surface of the inner rigid ring is formed by two-dimensionally winding polyamide with the reinforcement content of M55J high-modulus carbon fiber being 60%, wherein the winding mode can be a longitudinal winding mode with the winding angle not exceeding 20 degrees; the main body of the inner rigid ring is made of polyimide resin with a high-modulus carbon fiber reinforcement content of 50% and arranged axially, and M60 is arranged axially.
The middle transition reinforcing support ring is made of thermoplastic polyester resin with T1000 carbon fiber reinforcing content of 50% along the axial direction of the nut.
The surface hybrid fiber reinforced structure ring is composed of T1000 carbon fibers and UHMWPE fibers in a hybrid ratio of 5:1, and a resin matrix of the surface hybrid fiber reinforced structure ring is made of 55% polyimide resin.
After the laminated structure is plasticized and molded, the laminated structure is placed in a nut mold with a certain cavity for secondary plasticizing processing of threads, heating is carried out according to the hot melting plasticizing characteristic of a resin matrix, after the temperature reaches the resin hot melting temperature of the nut, the nut is pressurized, wherein the plasticizing temperature is controlled within 270 ℃, the pressurizing pressure is controlled within 6MPa, the secondary plasticizing thread processing time is controlled within 4 hours, and after the mold is cooled, a nut sample is taken out.
Comparative example 1
This example provides a method of making a thermoplastic composite nut, differing from example 1 in that the composite nut is made entirely of surface hybrid fiber reinforced structural rings.
Comparative example 2
This example provides a method for manufacturing a thermoplastic composite nut, which is different from example 1 in that the inner surface of the inner rigid ring is plasticized and formed by three-dimensionally winding high-modulus carbon fiber and polyethylene.
Comparative example 3
The embodiment provides a method for manufacturing a thermoplastic composite nut, which is different from embodiment 1 in that the inner surface of the inner rigid ring is formed by plasticizing and molding hoop-wound high-modulus carbon fiber and polyethylene, and the winding angle of the hoop-winding is 75 degrees.
Mechanical property tests are carried out on the thermoplastic composite nuts prepared in examples 1-4 and comparative examples 1-3, and it is found that the actual mechanical property of the thermoplastic composite nut described in comparative example 1 is worse even though the thermoplastic composite nut is completely made of the surface hybrid fiber reinforced structural ring with the highest strength, while the comparative example 2 adopts three-dimensional winding, the inventor finds that in practical application, the nut composite structure is easy to separate and fall off, and obviously, the two-dimensional winding is beneficial to the tight combination of two-phase interfaces. The two-dimensional structure of the composite nut described in the comparative example 3 with an excessively large winding angle is easy to loosen, and the mechanical property requirement cannot be met in practical application.
From the comparison of the mechanical properties, the nut is made of the surface hybrid fiber reinforced structural ring with the strongest rigidity, the mechanical property is worse than that of the nut made of the three-layer annular lamination, and the mechanical property of the nut is improved due to the matching relationship of the three-layer annular lamination.
From comparative examples 2 and 3, the two-dimensional winding is adopted, and a specific angle is defined, so that the mechanical property of the composite nut is improved.
The disclosure of the present invention is not limited to the specific embodiments, but rather to the specific embodiments, the disclosure is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A thermoplastic composite nut is characterized by comprising a surface thread layer, an internal rigid ring, a middle transition reinforced support ring and a hybrid fiber reinforced ring from inside to outside in sequence;
the surface thread layer is a carbon fiber composite thermoplastic resin layer, and the inner surface of the surface thread layer is of a thread structure;
the main body of the inner rigid ring is made of high-modulus carbon fibers along the axial direction of the nut;
the main body of the middle transition reinforcing support ring is made of high-strength carbon fibers along the axial direction of the nut;
the hybrid fiber reinforced ring is composed of a thermoplastic resin and hybrid fibers.
2. The thermoplastic composite nut of claim 1 wherein said inner rigid ring has an inner surface circumferentially wound with carbon fibers wound in a two-dimensional winding arrangement
Preferably, the two-dimensional winding arrangement comprises hoop winding, spiral winding and longitudinal winding.
Preferably, wherein the winding angle of the hoop winding is controlled within the range of 85-90 °; the winding angle of the spiral winding is controlled to be 45-70 degrees; the winding angle of the longitudinal winding does not exceed 25 deg..
Preferably, the high modulus carbon fiber comprises M40, M40J, M55, M55J, M60, M60J.
Preferably, the high-strength carbon fiber is any one of T300, T700, T800 and T1000 carbon fiber;
preferably, the hybrid fibers comprise high strength carbon fibers and high tenacity fibers, wherein the high strength carbon fibers comprise T300, T700, T800, T1000 carbon fibers and the high tenacity fibers comprise aramid fibers, UHMWPE fibers, PBO fibers.
Preferably, the thermoplastic resin includes polyethylene, polypropylene, polycarbonate, thermoplastic polyester, polyphenylene sulfide, polyether ether ketone, polyether ketone, polyamide, polyimide.
3. The preparation method of the thermoplastic composite nut is characterized in that the thermoplastic composite nut is formed by compounding three annular laminations from inside to outside, wherein the three annular laminations are respectively an internal rigid ring, a middle transition reinforced support ring and a surface hybrid fiber reinforced structure ring;
comprises the steps of laminated one-time plasticizing molding and integral two-time plasticizing molding,
the laminated layer is subjected to one-step plasticizing molding, namely three annular laminated layers are subjected to plasticizing molding by resin, carbon fiber or hybrid fiber, and particularly, the inner surface of the internal rigid ring is subjected to plasticizing molding by adopting high-modulus carbon fiber and polyethylene which are wound in two dimensions; the main body of the inner rigid ring is reinforced by high-modulus carbon fibers arranged along the axial direction,
the middle transition reinforcing support ring is prepared by carbon fiber reinforcement along the axial direction of the nut and plasticizing and molding of propylene resin;
the surface hybrid fiber reinforced structural ring is prepared by plasticizing and molding hybrid carbon fibers, high-toughness fibers and thermoplastic polyester resin;
the integral secondary plasticizing molding is that three annular laminated layers are arranged according to the internal and external structures and then are plasticized and molded to obtain the composite material.
4. The method of claim 3, wherein the inner rigid ring has an inner surface hoop-wound with carbon fibers, optionally any one of M40, M40J, M55, M55J, M60, M60J,
or the two-dimensional winding arrangement mode comprises hoop winding, spiral winding and longitudinal winding, wherein the winding angle of the hoop winding is controlled within the range of 85-90 degrees, the winding angle of the spiral winding is controlled within the range of 45-70 degrees, and the winding angle of the longitudinal winding is not more than 25 degrees.
5. The method of claim 3, wherein the whole inner rigid ring is made of thermoplastic resin as a matrix, and the matrix content of the whole rigid ring is controlled within a range of 40-60%, and is flexibly adjusted according to design requirements.
6. The method of claim 3, wherein the thermoplastic resin matrix of the inner rigid ring comprises one or more of polyethylene, polypropylene, polycarbonate, thermoplastic polyester, polyphenylene sulfide, polyetheretherketone, polyetherketone, polyamide, and polyimide.
7. The method for preparing a thermoplastic composite nut as claimed in claim 3, wherein the intermediate transition reinforced support ring is arranged by high-strength carbon fibers along the axial direction of the nut and is compositely processed by using thermoplastic resin as a matrix;
preferably, the high-strength carbon fibers include T300, T700, T800, T1000 carbon fibers;
or, the thermoplastic resin matrix of the middle transition reinforced support ring comprises one or more of polyethylene, polypropylene, polycarbonate, thermoplastic polyester, polyphenylene sulfide, polyether ether ketone, polyether ketone, polyamide and polyimide;
or the matrix content of the whole intermediate transition reinforcing support ring is controlled within the range of 40-60 percent and is flexibly adjusted according to the design requirement;
or the surface hybrid fiber reinforced structure ring adopts high-strength carbon fiber and high-toughness fiber for hybrid reinforcement, and thermoplastic resin as a matrix for composite processing,
preferably, the high-strength carbon fiber comprises T300, T700, T800 and T1000 carbon fibers, the high-toughness fiber comprises aramid fiber, UHMWPE fiber and PBO fiber, the mixing ratio of the two fibers can be flexibly adjusted according to the design requirement,
or, the thermoplastic resin matrix of the surface hybrid fiber reinforced structural ring comprises one or more of polyethylene, polypropylene, polycarbonate, thermoplastic polyester, polyphenylene sulfide, polyether ether ketone, polyether ketone, polyamide and polyimide,
or, the resin matrix content is controlled within the range of 40-60%.
8. The method of claim 3, wherein the integral post-plastication molding step comprises:
arranging the three annular laminated layers according to the inner and outer structures, placing the three annular laminated layers in a nut mold with a certain cavity for thread secondary plasticizing processing, heating according to the hot melting plasticizing property of a resin matrix, pressurizing the resin matrix after the temperature reaches the resin hot melting temperature of the nut, and taking out a nut sample after the mold is cooled;
preferably, the plasticizing temperature is controlled within the range of 180-290 ℃, the pressurizing pressure is controlled within the range of 2-8MPa, and the time for secondary plasticizing thread processing is controlled within the range of 2-5 hours.
9. A thermoplastic composite nut produced by the method for producing a thermoplastic composite nut according to any one of claims 3 to 8.
10. A fastening device comprising the thermoplastic composite nut and bolt of claim 1 or 2 or 9, the bolt having threads corresponding to the surface thread layer threads;
preferably, the bolt is a metal bolt.
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| CN202011057492.XA CN112339355A (en) | 2020-09-30 | 2020-09-30 | Thermoplastic composite nut and preparation method and application thereof |
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