CN116423882A - Method for manufacturing anchor bolt nut and anchor bolt nut - Google Patents
Method for manufacturing anchor bolt nut and anchor bolt nut Download PDFInfo
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- CN116423882A CN116423882A CN202310481886.5A CN202310481886A CN116423882A CN 116423882 A CN116423882 A CN 116423882A CN 202310481886 A CN202310481886 A CN 202310481886A CN 116423882 A CN116423882 A CN 116423882A
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- prepreg
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- fiber fabric
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 14
- 238000004804 winding Methods 0.000 claims abstract description 40
- 238000000748 compression moulding Methods 0.000 claims abstract description 14
- 239000000835 fiber Substances 0.000 claims description 94
- 239000004744 fabric Substances 0.000 claims description 58
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 41
- 239000004917 carbon fiber Substances 0.000 claims description 41
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 36
- 239000003822 epoxy resin Substances 0.000 claims description 33
- 229920000647 polyepoxide Polymers 0.000 claims description 33
- 239000003365 glass fiber Substances 0.000 claims description 28
- 229920005989 resin Polymers 0.000 claims description 28
- 239000011347 resin Substances 0.000 claims description 28
- 239000011159 matrix material Substances 0.000 claims description 16
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 9
- 229930185605 Bisphenol Natural products 0.000 claims description 7
- 239000004593 Epoxy Substances 0.000 claims description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 4
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 claims description 4
- 239000004202 carbamide Substances 0.000 claims description 4
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000012745 toughening agent Substances 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011152 fibreglass Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 239000004412 Bulk moulding compound Substances 0.000 description 5
- 238000010008 shearing Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- ZWOULFZCQXICLZ-UHFFFAOYSA-N 1,3-dimethyl-1-phenylurea Chemical compound CNC(=O)N(C)C1=CC=CC=C1 ZWOULFZCQXICLZ-UHFFFAOYSA-N 0.000 description 2
- PLIKAWJENQZMHA-UHFFFAOYSA-N 4-aminophenol Chemical compound NC1=CC=C(O)C=C1 PLIKAWJENQZMHA-UHFFFAOYSA-N 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XMTQQYYKAHVGBJ-UHFFFAOYSA-N 3-(3,4-DICHLOROPHENYL)-1,1-DIMETHYLUREA Chemical compound CN(C)C(=O)NC1=CC=C(Cl)C(Cl)=C1 XMTQQYYKAHVGBJ-UHFFFAOYSA-N 0.000 description 1
- MOAPNXVHLARBNQ-UHFFFAOYSA-N 3-[4-[[4-(dimethylcarbamoylamino)phenyl]methyl]phenyl]-1,1-dimethylurea Chemical compound C1=CC(NC(=O)N(C)C)=CC=C1CC1=CC=C(NC(=O)N(C)C)C=C1 MOAPNXVHLARBNQ-UHFFFAOYSA-N 0.000 description 1
- YBRVSVVVWCFQMG-UHFFFAOYSA-N 4,4'-diaminodiphenylmethane Chemical compound C1=CC(N)=CC=C1CC1=CC=C(N)C=C1 YBRVSVVVWCFQMG-UHFFFAOYSA-N 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- AUSGLDHLCBXRML-UHFFFAOYSA-N bis(oxiran-2-ylmethyl) 2-[(3-methyloxiran-2-yl)methyl]butanedioate Chemical compound C(C1CO1)OC(=O)CC(CC1C(C)O1)C(=O)OCC1CO1 AUSGLDHLCBXRML-UHFFFAOYSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- 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
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
-
- 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
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/681—Component parts, details or accessories; Auxiliary operations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention provides a manufacturing method of an anchor rod nut and the anchor rod nut. The manufacturing method comprises the following steps: step S1, winding a prepreg tape on the surface of a threaded mandrel to form a prepreg tape layer; s2, winding prepreg tows on the surface of the prepreg tape layer to form a prepreg tow layer; step S3, winding a prepreg sheet on the surface of the prepreg tow layer to form a prepreg sheet layer, so as to obtain a prefabricated assembly; and S4, carrying out compression molding on the prefabricated assembly to obtain the anchor rod nut. According to the screw thread mandrel, the surface of the screw thread mandrel is wound with the prepreg tape, the prepreg tows and the prepreg sheet to form the prepreg tape layer, the prepreg tows and the prepreg sheet layer which are sequentially arranged from inside to outside, the anchor rod nut is obtained through compression molding, the anchor rod nut is sequentially arranged through different layering, the strength and the rigidity of the screw thread are effectively improved, the slipping is prevented, and meanwhile the radial load of the nut can be effectively increased.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a manufacturing method of an anchor rod nut and the anchor rod nut.
Background
The anchor rod is a main supporting device for supporting a coal roadway, and the composite material anchor rod has the advantages of nonmetal, good durability, light weight, low production cost and the like, so that the composite material anchor rod starts to gradually replace a steel anchor rod to be popularized and applied in a coal mine. At present, a common glass fiber reinforced plastic anchor rod nut is generally formed by adopting a Bulk Molding Compound (BMC) reinforced by chopped glass fibers in a compression molding mode, and the nut strength is low. The lower bearing capacity of the joint part between the tail part of the glass fiber reinforced plastic anchor rod body and the nut in the use process reduces the strength of the whole anchor rod, the damage of the anchor rod nut is mainly represented by the fact that the internal thread of the nut or the thread of the external thread section of the anchor rod is flattened and fails under the action of shear stress, the nut is crushed or crushed by the extrusion deformation of the tray, and the failure is mainly caused by the fact that the thread strength and the rigidity of the nut are poor, and the shearing resistance of the thread of the nut is low, so that the nut is pulled off to fail.
In view of this, the present invention has been made.
Disclosure of Invention
The invention mainly aims to provide a manufacturing method of an anchor rod nut and the anchor rod nut, which are used for solving the problems of failure caused by the fact that the nut is pulled out due to poor screw thread strength and rigidity and low shearing resistance of screw threads of a common glass fiber reinforced plastic anchor rod nut in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method of manufacturing a rock bolt nut, the method comprising the steps of: step S1, winding a prepreg tape on the surface of a threaded rod to form a prepreg tape layer; s2, winding prepreg tows on the surface of the prepreg tape layer to form a prepreg tow layer; step S3, winding a prepreg sheet on the surface of the prepreg tow layer to form a prepreg sheet layer, and obtaining a prefabricated assembly; step S4, carrying out compression molding on the prefabricated assembly to obtain an anchor rod nut; the prepreg tape comprises a first fiber fabric and a first matrix resin attached to the first fiber fabric, the prepreg tows comprise fiber tows and a second matrix resin attached to the fiber tows, and the prepreg sheet comprises a fiber sheet and a third matrix resin attached to the fiber sheet.
Further, in the step S1, the first fiber fabric is a carbon fiber fabric or a glass fiber fabric, and the surface density of the first fiber fabric is 150-250 g/m 2 。
Further, the tensile strength of the carbon fibers in the carbon fiber fabric is 4600-4900 MPa, and the tensile modulus is 230-250 GPa.
Further, the glass fibers have a tensile strength of 3300 to 3700MPa and a tensile modulus of 90 to 100GPa.
Further, the width of the prepreg tape is 40 to 50mm.
Further, the prepreg tape is multilayered.
Further, the winding direction of the prepreg tape is 40 to 50 DEG with respect to the central axis of the threaded mandrel.
Further, in the prepreg tape, the mass content of the first fiber fabric is 40 to 55%.
Further, the fiber tows are carbon fiber tows or glass fiber tows.
Further, the specification of the fiber tows is 24K-48K.
Further, the prepreg tow layer is a plurality of layers.
Further, the winding aroma of the prepreg tows is 40-50 degrees or 85-95 degrees based on the central axis of the threaded mandrel.
Further, in the prepreg tows, the mass content of the fiber tows is 40-55%.
Further, in step S3, the fiber sheet comprises a second fiber fabric and chopped fibers, and the chopped fibers are laid on the second fiber fabricForming a chopped fiber layer on the fiber fabric, wherein the second fiber fabric is a carbon fiber fabric or a glass fiber fabric, and the surface density is 150-250 g/m 2 The chopped fiber is glass fiber or carbon fiber, and the diameter is 6-13 mu m.
Further, the mass ratio of the chopped fibers to the second fibrous web is: 0.6-1:1.5-2.
Further, the width of the prepreg sheet is 30 to 40mm.
Further, the mass content of the fiber sheet in the prepreg sheet is 40-55%.
Further, in the step S4, the temperature of compression molding is 135-1450 ℃, the pressure is 15-25 MPa, and the time is 10-20 min.
Further, the direction of pressure application is perpendicular to the central axis of the threaded mandrel.
Further, the first matrix resin, the second matrix resin, and the third matrix resin are each independently an epoxy resin.
Further, the epoxy resin comprises the following raw materials in percentage by mass: 30-50% of liquid bisphenol type epoxy resin, 10-30% of multifunctional epoxy resin, 20-40% of resin of solid epoxy E20, 5-8% of dicyandiamide, 3-5% of organic urea accelerator and 8-10% of toughening agent, wherein the liquid bisphenol type epoxy resin is liquid bisphenol A type epoxy resin and/or bisphenol F type epoxy resin.
In order to achieve the above object, according to another aspect of the present invention, there is provided an anchor rod nut prepared mainly by any one of the manufacturing methods provided in the first aspect.
Further, the screw nut is in a truncated cone shape, and the taper of the anchor rod nut is 1:4-6, preferably 1:5.
Further, the interface of the screw thread of the anchor rod nut is an arc, the radius of the arc is 6-7 mm, the height of the screw thread is 1.2-1.4 mm, and the width of the screw thread is 2.8-3.2 mm.
Further, the concentricity tolerance of the anchor nut is + -0.1 mm.
By using the technical scheme, the prepreg tape layer, the prepreg tow layer and the prepreg sheet layer which are sequentially arranged from inside to outside are formed by winding the prepreg tape layer, the prepreg tow layer and the prepreg sheet on the surface of the threaded mandrel, and the anchor rod nut is obtained through compression molding. In addition, this stock nut can also give the certain deformability of nut when satisfying nut intensity through using the preimpregnation sheet layer as the skin, and then can make the stock nut hug tightly the stock body of rod under the extrusion effect of tray, further increases the whole bearing capacity of stock subassembly.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present invention will be described in detail with reference to examples.
As analyzed in the background technology of the application, the common glass fiber reinforced plastic anchor rod nut is molded by adopting common glass fiber reinforced bulk molding compound, the screw thread strength and rigidity of the nut are poor, the shearing resistance is low, and in the use process, the problems that the screw thread of the internal screw thread of the nut or the external screw thread section of the anchor rod is flattened and failed under the action of shearing stress, and the nut is extruded, deformed and crushed by a tray exist. In order to solve the problem, the application provides a manufacturing method of an anchor rod nut and the anchor rod nut.
In an exemplary embodiment of the present application, a method of manufacturing a rock bolt nut is provided, the method comprising the steps of: step S1, winding a prepreg tape on the surface of a threaded mandrel to form a prepreg tape layer; s2, winding prepreg tows on the surface of the prepreg tape layer to form a prepreg tow layer; step S3, winding a prepreg sheet on the surface of the prepreg tow layer to form a prepreg sheet layer, so as to obtain a prefabricated assembly; step S4, carrying out compression molding on the prefabricated assembly to obtain an anchor rod nut; wherein the prepreg tape comprises a first fibrous fabric and a first matrix resin attached to the first fibrous fabric; the prepreg tows include a fiber tows and a second matrix resin attached to the fiber tows, and the prepreg sheet includes a fiber sheet and a third matrix resin attached to the fiber sheet.
By using the technical scheme, the prepreg tape layer, the prepreg tow layer and the prepreg sheet layer which are sequentially arranged from inside to outside are sequentially wound on the surface of the threaded mandrel, and the anchor rod nut is sequentially arranged through different layering, so that the strength and the rigidity of threads are effectively increased, slipping is prevented, and meanwhile, the radial load of the nut can be effectively increased. In addition, this stock nut can also give the certain deformability of nut when satisfying nut intensity through using the preimpregnation sheet layer as the skin, and then can make the stock nut hug tightly the stock body of rod under the extrusion effect of tray, further increases the whole bearing capacity of stock subassembly.
The specific types of the first base resin, the second base resin, and the third base resin are not particularly limited, and any resin type commonly used in the art may be used. In order to further increase the strength of the anchor nut, it is preferable that each of the first matrix resin, the second matrix resin, and the third matrix resin is independently an epoxy resin.
Specifically, in some embodiments, the raw materials of the epoxy resin include, in mass percent: 30-50% of liquid bisphenol type epoxy resin (such as 30%, 35%, 40%, 42%, 45%, 48%, 50% or any two number range), 10-30% of multifunctional epoxy resin (such as 10%, 15%, 20%, 25%, 30% or any two number range), 20-40% of solid epoxy E20 resin (such as 20%, 25%, 30%, 32%, 35%, 38%, 40% or any two number range), 5-8% of dicyandiamide (such as 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8% or any two number range), 3-5% of organic urea accelerator (such as 3%, 3.5%, 4%, 4.5%, 5% or any two number range), 8-10% of toughening agent (such as 8%, 8.5%, 9%, 9.5%, 10% or any two number range), wherein the liquid bisphenol type epoxy resin is liquid bisphenol A type epoxy resin and/or bisphenol type F epoxy resin.
The specific type of the above-mentioned multifunctional epoxy resin is not limited, and includes, but is not limited to, at least one of 4,4' diaminodiphenylmethane tetraglycidyl amine, triglycidyl para-aminophenol, and diglycidyl 4, 5-epoxyhexane-1, 2-dicarboxylate.
The specific type of the above-mentioned organic urea accelerator is also not limited, and includes at least one of phenyldimethylurea, 3- (3, 4-dichlorophenyl) -1, 1-dimethylurea, and N, N- (methylenedi-4, 1-phenylene) bis (N, N-dimethylurea).
The specific type of the toughening agent is not limited, and includes at least one of carboxyl terminated nitrile rubber, nano core shell rubber particles, polyurethane modified epoxy resin and polysulfide rubber.
In the step S1, the first fiber fabric is preferably a carbon fiber fabric or a glass fiber fabric, so as to further improve the strength of the prepreg, and further improve the strength of the anchor rod nut. In some embodiments, it is preferred that the first fibrous web have an areal density of 150 to 250g/m 2 Such as 150g/m 2 、180g/m 2 、200g/m 2 、250g/m 2 Or a range of values consisting of any two values. The specific type of the carbon fiber in the carbon fiber fabric is not limited, and all carbon fibers commonly used in the art can be used in the field, in some embodiments, the tensile strength of the selected carbon fiber is 4600-4900 MPa, and the tensile modulus is 230-250 GPa, so that the prepreg tape formed by adhering the woven carbon fiber fabric to the first matrix resin is favorable for having higher strength. The specific type of glass fibers in the glass fiber fabric is not limited, and glass fibers commonly used in the art may be used, and in some embodiments, glass fibers having a tensile strength of 3300 to 3700MPa and a tensile modulus of 90 to 100GPa are selected.
To facilitate winding of the prepreg tape on the threaded mandrel, the width of the prepreg tape is preferably 40 to 50mm (e.g., 40mm, 42mm, 45mm, 48mm, 50mm, or a range of values consisting of any two values). The winding complexity is higher when the width of the prepreg tape is too small, the prepreg tape layer with uniform thickness is difficult to form, and the width of the prepreg tape is too large, so that the prepreg tape is not beneficial to winding on a threaded mandrel.
The number of layers of the prepreg tape layers is not particularly limited, and the prepreg tape layers can be one layer or multiple layers according to the requirement of the anchor rod nut, and when the prepreg tape layers are multiple layers, the strength of threads in the anchor rod nut can be improved more conveniently.
In order to further enhance the strength of the prepreg tape layer, it is preferable that the winding direction of the prepreg tape is 40 to 50 ° with respect to the central axis of the threaded core rod when the prepreg tape is wound around the threaded core rod, so that the strength and rigidity of the thread are further enhanced, and the radial load of the nut can be increased. In some embodiments, the prepreg tape is wound on the surface of the threaded mandrel three layers in a clockwise direction and then wound on the surface of the threaded mandrel three layers in a counter-clockwise direction.
In step S2, in order to further increase the strength of the fiber strand layer, the fiber filaments in the fiber strand are preferably carbon fibers or glass fibers.
The specific specifications of the fiber tows are not limited, and in some embodiments, the specifications of the fiber tows are 24K-48K, which is more beneficial to improving the thread strength of the anchor rod nut.
The number of the prepreg tow layers is at least one, and in order to further improve the strength of the anchor bolt nut, the prepreg tow layers are preferably a plurality of layers.
In order to improve the efficiency of winding the prepreg filaments, the winding direction of the prepreg tows is preferably 40-50 degrees or 85-95 degrees based on the central axis of the threaded mandrel, so that the strength and the rigidity of the threads are further enhanced, and the radial load of the nut can be increased. In some embodiments, the prepreg tows are wound around the outer surface of the prepreg tape layer in a circumferential direction to form a prepreg tows layer, and preferably the number of layers of the prepreg tape layer is five.
In the step S3, the fiber sheet includes a second fiber fabric and chopped fibers, and the chopped fibers are laid on the second fiber fabric layer to form a chopped fiber layer, that is, the fiber sheet includes a second fiber fabric and chopped fibers which are stacked; wherein the second fiber fabric is carbon fiber fabric or glass fiber fabric, and the surface density is 150-250 g/m 2 The chopped fibers are glass fibers having a diameter of 6 to 13 μm (e.g., 6, 8, 10, 11 or 13 μm). Preferably fibrous sheetsIn the layer, the mass ratio of the chopped fibers to the second fiber fabric is 0.6-1:1.5-2 (such as 0.6:1.5, 0.6:1.8, 0.6:2, 0.8:1.5, 0.8:1.8, 0.8:2, 1:1.5, 1:1.8 or 1:2), and the prepreg sheet formed by the fiber sheet has more excellent mechanical strength.
In order to facilitate winding of the prepreg sheet around the outer surface of the prepreg tow layer to form the prepreg sheet layer, the prepreg sheet preferably has a width of 30 to 40mm (e.g., 30mm, 32mm, 35mm, 38mm, 40mm, or any two values in the range of values).
To further increase the strength of the anchor bolt nut, in some embodiments, the mass content of the first fibrous fabric in the prepreg tape is 40-55%; such as 40%, 45%, 50%, 55% or any two values. In other embodiments, the mass content of the fiber tows in the prepreg tows is 40-55%; such as 40%, 45%, 50%, 55% or any two values. In other embodiments, the mass content of the fiber sheet in the prepreg sheet is 40 to 55%; such as 40%, 45%, 50%, 55% or any two values.
In the above step S4, specific process conditions of the compression molding are not limited, and the conditions of the compression molding commonly used in the art may be used. In order to further improve the efficiency of the compression molding, the temperature of the compression molding is preferably 135-145 ℃ (such as 135 ℃, 138 ℃, 140 ℃, 142 ℃, 145 ℃ or a range of any two values), the pressure is 15-25 MPa (such as 15MPa, 18MPa, 20MPa, 22MPa, 25MPa or a range of any two values), and the time is preferably 10-20 min (such as 10min, 12min, 15min, 18min, 20min or a range of any two values).
When the common glass fiber reinforced plastic anchor rod nut is molded by adopting chopped fiber glass fiber reinforced Bulk Molding Compound (BMC), a mold cavity is vertically placed, materials around a threaded core rod are compacted in the vertical direction when the mold cavity is vertically pressurized, but the material pressure in the horizontal direction is lower, so that the strength of the molded anchor rod threads is poor. In some embodiments, the direction of the applied pressure is perpendicular to the central axis of the threaded core rod, so that the strength of the formed anchor rod threads can be improved while the compaction of the threads is ensured, the anchor rod nut cavity is preferably horizontally distributed, and the pressure is vertically applied between the threaded core rod and the upper pressure head and the lower pressure head of the die during compression forming.
It should be noted that, the nut prepared by the method for manufacturing the anchor rod nut provided by the application may be any shape commonly used in the art, and in order to improve the matching between the nut and the anchor rod, it is preferable that the nut is a tray nut in a truncated cone shape, a small diameter part is used as a head, a large diameter part is used as a tail, and when the prepreg tows are used for winding the prepreg tape layer, the number of winding layers is sequentially increased from the head to the tail so as to form a truncated cone-shaped structure.
In a second exemplary embodiment of the present application, there is also provided a rock bolt nut prepared substantially in accordance with any one of the methods of manufacture provided in the first exemplary embodiment described above.
The utility model provides an anchor rod nut has set gradually prepreg tape layer, preimpregnation silk layer and with preimpregnation sheet layer from interior to exterior, through different layering order setting, has effectively increased the intensity and the rigidity of screw thread to prevent the slippage, can effectively increase the radial load of nut simultaneously. In addition, this stock nut gives the certain deformability of nut through using the preimpregnation lamella as the skin when satisfying nut intensity, and then can make the stock nut hug closely the stock body of rod under the extrusion effect of tray, further increases the whole bearing capacity of stock subassembly.
In some embodiments, the anchor rod nut is in a shape of a circular table, namely a tray nut, and the taper of the tray nut is 1:4-6, and is more preferably 1:5, so that the matching between the tray nut and the anchor rod is further improved, the nut is tightly held by the anchor rod body under the extrusion action of the tray, and the overall bearing capacity of the anchor rod assembly is improved.
In some embodiments, the contact length of the anchor nut with the tray bore is 10-15 mm less than the tray bore height.
In other embodiments, the interface of the threads of the anchor rod nut is an arc, the radius of the arc is 6-7 mm, the height of the threads is 1.2-1.4 mm, and the width of the threads is 2.8-3.2 mm, so that the matching performance with the anchor rod is enhanced, the tightness of the anchor rod assembly is further improved, and the overall bearing capacity of the anchor rod assembly is further improved.
In some embodiments, the concentricity tolerance of the anchor rod nut is +/-0.1 mm, and the quality is more stable and reliable.
The advantageous effects of the present application will be further described below with reference to examples and comparative examples.
Example 1
The embodiment provides a round table-shaped anchor rod nut, which is prepared according to the following steps:
(1) Providing a prepreg tape, cutting the prepreg tape into narrow bands with the width of 40-50 mm, winding the narrow bands on the surface of a threaded mandrel in a clockwise direction for three layers, and winding the narrow bands on the surface of the threaded mandrel in a counterclockwise direction for three layers to form a prepreg tape layer coated outside the threaded mandrel, wherein the prepreg tape comprises a carbon fiber twill fabric and epoxy resin attached to the surface of the carbon fiber twill fabric, and the surface density of the carbon fiber twill fabric is 200g/m 2 The raw materials of the epoxy resin comprise: 40wt% of liquid bisphenol A type epoxy resin, 15wt% of multifunctional epoxy resin, 25 wt% of solid epoxy E20 resin, 7% of dicyandiamide, 4% of phenyl dimethyl urea, 9% of carboxyl terminated nitrile rubber, and 45wt% of carbon fiber twill fabric in the prepreg tape.
(2) Providing a prepreg tow, taking the central axis of a threaded mandrel as a reference, winding the prepreg tow on the outer surface of a prepreg tape layer for three layers along the winding direction of 45+/-5 degrees, then winding the prepreg tow for three layers along the winding direction of-45+/-5 degrees, and then winding the prepreg tow for five layers in a circumferential direction; taking the small diameter part of the anchor rod nut as the head part and the large diameter part as the tail part, and winding ten layers of prepreg tows on the tail part to form a truncated cone shape so as to obtain a prepreg tow layer; the prepreg tows comprise fiber tows and epoxy resin attached to the fiber tows, the epoxy resin is the same as the epoxy resin on the prepreg tape, the fiber tows are 24K carbon fiber tows, the tensile strength is 4700Mpa, the tensile modulus is 240GPa, and the content of the carbon fiber tows in the prepreg layer is 45wt%.
(3) Providing a prepreg, cutting the prepreg into prepreg strips with the width of 30-40 mm, winding the prepreg strips on the outer surface of a prepreg tow layer in a circumferential direction, and winding three layers to form a shapeForming a prepreg sheet layer to obtain a prefabricated assembly; wherein the prepreg sheet comprises a fiber sheet and epoxy resin attached to the fiber sheet, the epoxy resin is the same as the epoxy resin on the prepreg tape, the fiber sheet is formed by compounding continuous fiber fabric and randomly oriented chopped long fibers, and the continuous fiber fabric has an areal density of 200g/m 2 The chopped fiber is carbon fiber, the diameter is 6-7 mu m, the length is 30-50 mm, and the mass ratio of the chopped fiber to the carbon fiber fabric is 1:1.5; and the content of the fiber sheet in the prepreg sheet is 45wt%; and the total mass of the preform assembly was 180g.
(4) Placing the prefabricated assembly into an anchor rod nut mold, wherein the mold is provided with a six-cavity mold, the mold cavity is horizontally placed, the temperature of the mold is controlled to be 140+/-3 ℃, then the prefabricated assembly is vertically applied to the mold cavity under the pressure of 20MPa, and the pressure is maintained for 15min; and taking out the workpiece from the die cavity after the pressure maintaining is finished, cooling and trimming to obtain the round-table-shaped anchor rod nut.
Example 2
This example differs from example 1 in that the carbon fiber twill weave content in the prepreg tape is 40wt% and the carbon fiber tow content in the prepreg tow is 40wt%; the content of the fiber sheet in the prepreg sheet was 40wt%.
Example 3
This example differs from example 1 in that the content of carbon fiber twill in the prepreg tape is 55wt% and the content of carbon fiber tows in the prepreg tows is 55wt%; the content of the fiber sheet in the prepreg sheet was 55wt%.
Example 4
The difference between this example and example 1 is that in step (2), glass fiber tows are used instead of carbon fiber tows as the fiber tows in the prepreg tows, and the tensile strength of the glass fiber tows is 3500Mpa and the tensile modulus is 95GPa.
Example 5
This example differs from example 1 in that in step (1), in the prepreg tape, a glass fiber plain weave is used instead of a carbon fiber twill weave, and the areal density of the glass fiber plain weave is 200 g-m 2 。
Example 6
This example differs from example 1 in that in step (1), the surface density of the carbon fiber twill fabric in the prepreg tape is 150g/m 2 。
Example 7
This example differs from example 1 in that in step (1), the surface density of the carbon fiber twill fabric in the prepreg tape is 250g/m 2 。
Example 8
This example differs from example 1 in that in step (1), a prepreg tape having an areal density of 300g/m was used 2 The plain weave fabric of the glass fiber of (2) replaces the carbon fiber fabric; in the step (2), in the prepreg tows, glass fiber tows are used for replacing carbon fiber tows as fiber tows in the prepreg tows, and the tensile strength of the fiber of the glass fiber tows is 3500Mpa, and the tensile modulus of the fiber tows is 95Gpa.
Example 9
This example differs from example 1 in that in step (3), the mass ratio of carbon fiber fabric to chopped fiber in the fiber sheet is 0.6:1.5.
Example 10
The present embodiment is different from embodiment 1 in that in step (3), the fiber sheet is a carbon fiber fabric, and the chopped fibers are not provided on the carbon fiber fabric.
Example 11
The present embodiment is different from embodiment 1 in that in step (2), the prepreg tows are wound on the outer surface of the prepreg tape layer for three layers at a winding angle of 60±5°, and then wound for three layers in a winding direction of-60±5°.
Example 12
The present embodiment is different from embodiment 1 in that in step (2), the prepreg tows are wound three layers on the outer surface of the prepreg tape layer at a winding angle of 30±5°, and then wound three layers in a winding direction of-30±5°.
Example 13
This example differs from example 1 in that in step (4), the cavity is placed vertically while the direction of application of pressure is unchanged.
Comparative example 1
This comparative example differs from example 1 in that step (3) was not performed, and the prepreg tows were wound in multiple layers in step (2), resulting in a preform assembly having a total mass of 180g.
Comparative example 2
This comparative example differs from example 1 in that step (2) was not performed, in step (1) the prepreg tape was wound in multiple layers and the prepreg sheet was wound in multiple layers, resulting in a preform assembly having a total mass of 180g.
Comparative example 3
This comparative example differs from example 1 in that step (1) was not performed, in step (2) the pre-tows were wound six more layers and the pre-preg sheets were wound multiple layers, resulting in a pre-fabricated assembly with a total mass of 180g.
Test examples
The anchor nuts provided in the above examples and comparative examples were tested for maximum load capacity and toughness, and the results are shown in table 1 below. The testing method of the maximum bearing capacity is MTT 1061-2008 resin anchor rod glass fiber reinforced plastic rod body and accessories. The results are shown in Table 1 below.
TABLE 1
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the surface of the threaded mandrel is wound with the prepreg tape, the prepreg tows and the prepreg sheets to form the prepreg tape layer, the prepreg tows layer and the prepreg sheet layer which are sequentially arranged from inside to outside, and the anchor rod nut is obtained through compression molding. In addition, this stock nut can also give the certain deformability of nut when satisfying nut intensity through using the preimpregnation sheet layer as the skin, and then can make the stock nut hug tightly the stock body of rod under the extrusion effect of tray, further increases the whole bearing capacity of stock subassembly.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of manufacturing a rock bolt nut, the method comprising the steps of:
step S1, winding a prepreg tape on the surface of a threaded mandrel to form a prepreg tape layer;
s2, winding prepreg tows on the surface of the prepreg tape layer to form a prepreg tow layer;
step S3, winding a prepreg sheet on the surface of the prepreg tow layer to form a prepreg sheet layer, so as to obtain a prefabricated assembly;
step S4, carrying out compression molding on the prefabricated assembly to obtain the anchor rod nut;
wherein the prepreg tape comprises a first fiber fabric and a first matrix resin attached to the first fiber fabric, the prepreg tows comprise fiber tows and a second matrix resin attached to the fiber tows, and the prepreg sheet comprises a fiber sheet and a third matrix resin attached to the fiber sheet.
2. The method according to claim 1, wherein in the step S1, the first fiber fabric is a carbon fiber fabric or a glass fiber fabric, and the first fiber fabric has an areal density of 150 to 250g/m 2 ；
Preferably, the tensile strength of the carbon fibers in the carbon fiber fabric is 4600-4900 MPa, and the tensile modulus is 230-250 Gpa;
preferably, the tensile strength of glass fibers in the glass fiber fabric is 3300-3700 MPa, and the tensile modulus is 90-100 GPa;
preferably, the width of the prepreg tape is 40-50 mm;
preferably, the prepreg tape layer is a plurality of layers;
preferably, the winding direction of the prepreg tape is 40-50 degrees based on the central axis of the threaded mandrel;
preferably, in the prepreg tape, the mass content of the first fiber fabric is 40 to 55%.
3. The method according to claim 1, wherein the fiber tows are carbon fiber tows or glass fiber tows in step S2;
preferably, the specification of the fiber tows is 24K-48K;
preferably, the prepreg tow layer is a plurality of layers;
preferably, the winding direction of the prepreg tows is 40-50 degrees or 85-95 degrees based on the central axis of the threaded core rod;
preferably, in the prepreg tows, the mass content of the fiber tows is 40-55%.
4. The method according to claim 1, wherein the fiber sheet includes a second fiber fabric and chopped fibers laid on the second fiber fabric to form a chopped fiber layer, the second fiber fabric is a carbon fiber fabric or a glass fiber fabric, and the surface density is 150 to 250g/m 2 The chopped fibers are glass fibers or carbon fibers, and the diameter is 6-13 mu m;
preferably, the mass ratio of the chopped fibers to the second fiber fabric is 0.6-1:1.5-2;
preferably, the width of the prepreg sheet is 30-40 mm;
preferably, the mass content of the fiber sheet in the prepreg is 40-55%.
5. The method according to claim 1, wherein the temperature of the compression molding is 135-145 ℃, the pressure is 15-25 MPa, and the time is 10-20 min in step S4;
preferably, the direction of the pressure application is perpendicular to the central axis of the threaded mandrel.
6. The production method according to any one of claims 1 to 5, wherein the first base resin, the second base resin, and the third base resin are each independently an epoxy resin;
preferably, the epoxy resin comprises the following raw materials in percentage by mass: 30-50% of liquid bisphenol type epoxy resin, 10-30% of multifunctional epoxy resin, 20-40% of solid epoxy E20 resin, 5-8% of dicyandiamide, 3-5% of organic urea accelerator and 8-10% of toughening agent, wherein the liquid bisphenol type epoxy resin is liquid bisphenol A type epoxy resin and/or bisphenol F type epoxy resin.
7. A rock bolt nut, characterized in that it is mainly produced by the production method according to any one of claims 1 to 6.
8. A rock bolt nut according to claim 7, wherein the rock bolt nut is frustoconical with a taper of 1:4 to 6, preferably 1:5.
9. The anchor bolt nut of claim 7, wherein the interface of the threads of the anchor bolt nut is an arc, the radius of the arc is 6-7 mm, the height of the threads is 1.2-1.4 mm, and the width of the threads is 2.8-3.2 mm.
10. A rock bolt nut according to any one of claims 7 to 9, wherein the concentricity tolerance of the rock bolt nut is ± 0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310481886.5A CN116423882A (en) | 2023-04-28 | 2023-04-28 | Method for manufacturing anchor bolt nut and anchor bolt nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310481886.5A CN116423882A (en) | 2023-04-28 | 2023-04-28 | Method for manufacturing anchor bolt nut and anchor bolt nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116423882A true CN116423882A (en) | 2023-07-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310481886.5A Pending CN116423882A (en) | 2023-04-28 | 2023-04-28 | Method for manufacturing anchor bolt nut and anchor bolt nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116423882A (en) |
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2023
- 2023-04-28 CN CN202310481886.5A patent/CN116423882A/en active Pending
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