CN113450970A - Production method of multilayer wire and cable - Google Patents
Production method of multilayer wire and cable Download PDFInfo
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- CN113450970A CN113450970A CN202110302946.3A CN202110302946A CN113450970A CN 113450970 A CN113450970 A CN 113450970A CN 202110302946 A CN202110302946 A CN 202110302946A CN 113450970 A CN113450970 A CN 113450970A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 54
- 239000002184 metal Substances 0.000 claims abstract description 54
- 239000004033 plastic Substances 0.000 claims abstract description 24
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 238000005491 wire drawing Methods 0.000 claims abstract description 9
- 150000002739 metals Chemical class 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 25
- 229920001721 polyimide Polymers 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 238000004132 cross linking Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000005097 cold rolling Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000007847 structural defect Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 abstract description 50
- 230000000694 effects Effects 0.000 abstract description 4
- 239000011241 protective layer Substances 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 8
- 239000004020 conductor Substances 0.000 description 7
- VLDPXPPHXDGHEW-UHFFFAOYSA-N 1-chloro-2-dichlorophosphoryloxybenzene Chemical compound ClC1=CC=CC=C1OP(Cl)(Cl)=O VLDPXPPHXDGHEW-UHFFFAOYSA-N 0.000 description 4
- HLBLWEWZXPIGSM-UHFFFAOYSA-N 4-Aminophenyl ether Chemical compound C1=CC(N)=CC=C1OC1=CC=C(N)C=C1 HLBLWEWZXPIGSM-UHFFFAOYSA-N 0.000 description 4
- 238000010292 electrical insulation Methods 0.000 description 4
- 238000006068 polycondensation reaction Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000010345 tape casting Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/02—Stranding-up
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
Abstract
The invention belongs to the technical field of cable production, in particular to a production method of a multilayer wire cable, which aims at the problem of large occupied area and provides the following scheme, comprising the following steps: s1: smelting nonferrous metals such as copper, aluminum and alloy; s2: casting ingots; s3: rolling; s4: carrying out wire drawing treatment on the rolled nonferrous metal; s5: annealing the non-ferrous metal monofilament formed by wire drawing; s6: stranding a plurality of monofilaments together by using a stranding machine; s7: an insulating layer is extruded on the outer layer of the conductive wire core; s8: completing cabling of the electric wires and the electric cables; s9: an inner protective layer is extruded outside the cabled insulated wire core and armored; s10: directly extruding a plastic outer sheath on the wire and the cable by using an extruding machine; s11: and (5) detecting a finished product. The invention reduces the occupied area of the wire and the cable, reduces the geometric dimension of the wire and the cable, leads the outer sheath to have better internal protection effect, and the insulating layer has good insulating protection and can conduct heat conduction and flame retardance.
Description
Technical Field
The invention relates to the technical field of cable production, in particular to a production method of a multilayer wire cable.
Background
The wire and cable is used for transmitting electric (magnetic) energy, information and wire products for realizing electromagnetic energy conversion. A wire cable in a broad sense, also referred to as a cable for short, refers to an insulated cable, which can be defined as: an aggregate consisting of; the cable may also have additional conductors without insulation, i.e. conductors, insulation, inner sheath, outer sheath and armor type, so that most of the existing electric wires and cables are multilayer electric wires and cables.
Most of the existing multilayer electric wires and cables are subjected to the working procedures of drawing, stranding, insulating extrusion (wrapping), cabling, armoring, sheath extrusion and the like in the production process, but the number of the wires in the existing multilayer electric wires and cables is more, so that the occupied area is larger and the diameter is thicker after the stranding and wrapping are finished; the outer sheath of the existing multilayer wire cable mostly adopts a common plastic outer sheath, so that the protection effect is poor; the insulating layer of the existing multilayer wire cable has poor heat conduction effect.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a production method of a multilayer wire cable.
The invention provides a production method of a multilayer wire cable, which comprises the following steps:
s1: adding nonferrous metals such as copper, aluminum and alloy into a smelting furnace for smelting;
s2: injecting the smelted nonferrous metal into a mould, and condensing the nonferrous metal into an ingot shape for ingot casting;
s3: rolling the cast ingot-shaped nonferrous metal, pulling the rolled piece between rotating rollers by friction force, compressing and performing plastic deformation to make the rolled piece have a certain size and shape;
s4: drawing the rolled nonferrous metal, reducing the section, increasing the length and improving the strength of the nonferrous metal by using a drawing machine through one or more die holes of a drawing die, and obtaining the required cross-sectional area shape and size; the main technical parameter of wire drawing is a die matching technology;
s5: annealing the non-ferrous metal monofilament formed by wire drawing, slowly heating the non-ferrous metal monofilament to a certain temperature, keeping the temperature for enough time, and then slowly cooling the non-ferrous metal monofilament at a proper speed; the key of the annealing process is to prevent the oxidation of the nonferrous metal monofilament;
s6: a plurality of monofilaments are twisted together in a concentric layer twisting mode according to a specified direction by using a twisting machine, so that the flexibility and the integrity of a conductive wire core of the electric wire cable are improved, and the subsequent laying and installation are facilitated;
s7: the outer layer of the conductive wire core is extruded with a non-conductive insulating layer to isolate or wrap the conductive wire core so as to ensure the safe operation of electrical equipment, and the insulating layer comprises a polyimide film; the polyimide film is an H-grade insulating film produced by polycondensation of pyromellitic dianhydride and diaminodiphenyl ether in a high-polarity solvent and then by a tape casting method, and has excellent high and low temperature resistance, electrical insulation, cohesiveness, radiation resistance, medium resistance, chemical stability and flame retardance, so that the polyimide film has good insulation protection performance on conductor wire cores and can conduct heat conduction and flame retardance;
the main technical requirements of plastic insulation extrusion are that the eccentricity is an important mark for reflecting the extrusion process level, and the structural size and the deviation value of most products are clearly specified in the standard; smoothness is that the surface of the extruded insulating layer is required to be smooth, and the problems of rough surface, scorching and poor quality of impurities cannot be caused; the compactness is that the cross section of the extruded insulating layer is compact and firm, and cannot be provided with pinholes visible to naked eyes, so that the existence of air bubbles is avoided;
s8: twisting a plurality of insulated wire cores according to a certain rule, and completing filling of gaps among the wire cores and binding of the wire cores during twisting to complete cabling of the electric wire and the cable; the technical requirements of cabling are as follows: firstly, the twisting of the cable caused by the turning over of the opposite insulated wire core is avoided, and secondly, the insulating layer is prevented from being scratched; the filling ensures the roundness and stability of the cable after cabling, and the binding ensures that the cable core is not loose;
s9: an inner sheath isolation sleeve is extruded outside the cabled insulated wire core, then the inner sheath cushion layer is wound, and the insulated wire core is armored while the inner sheath cushion layer is wound, namely, a layer of metal protection is additionally arranged on the outermost surface of the insulated wire core, so that the inner insulated wire core and the inner sheath are prevented from being damaged during transportation and installation; the inner protective layer prevents the insulated wire core from being scratched by armor;
s10: the plastic outer sheath is directly extruded on the wire and the cable by using the plastic extruding machine, and the mechanical strength, elasticity, dimensional stability and solvent resistance of the plastic outer sheath are improved through cross-linking treatment;
s11: and (5) detecting finished products of the processed wires and cables, and packaging and warehousing the qualified products.
Preferably, in the S1, the smelting temperature of the smelting furnace is 1100-1300 ℃.
Preferably, in S3, the rolling process is cold rolling.
Preferably, in S5, the annealing has the functions of improving the toughness of the monofilament, reducing the hardness and residual stress of the nonferrous metal, stabilizing the dimension, reducing the deformation and crack tendency, refining the crystal grains and eliminating the structural defects so as to meet the requirements of the wire and cable on the conductive wire core.
Preferably, in S6, in the twisting process, a pressing form is adopted, so that the common circle is changed into a semicircle, a sector, a tile shape and a pressed circle, thereby reducing the occupied area of the electric wire and the electric cable and reducing the geometric size of the electric wire and the electric cable.
Preferably, in S6, the concentric layer twisting is performed such that the non-ferrous metal monofilaments are twisted around the center of the stranded wire layer by layer in an orderly manner, and the twisting directions of adjacent stranded layers are opposite.
Preferably, in S8, the cabling function is to satisfy the requirement of multiple cores of the electric wire, make the structure of the electric wire more stable, increase the flexibility of the electric wire, and make the three-phase magnetic field offset and reduce the loss.
Preferably, in S10, the outer sheath is used for improving the mechanical strength, chemical corrosion resistance, moisture resistance, water resistance and fire resistance of the electric wire and cable.
The beneficial effects of the invention are as follows:
1. according to the production method of the multilayer electric wire and cable, a plurality of insulated wire cores are stranded in the process of twisting, a pressing form is adopted, so that a common circle is changed into a semicircle, a sector, a tile shape and a pressed circle, the occupied area of the electric wire and cable is reduced, and the geometric size of the electric wire and cable is reduced.
2. According to the production method of the multilayer electric wire and cable, the plastic outer sheath is subjected to cross-linking treatment, so that the mechanical strength, elasticity, dimensional stability and solvent resistance of the plastic outer sheath are improved, and the protection effect on the conductor wire core, the insulating layer and the inner protection layer inside the plastic outer sheath is better.
3. The insulating layer comprises a layer of polyimide film, the polyimide film is an H-grade insulating film produced by polycondensation of pyromellitic dianhydride and diaminodiphenyl ether in a high-polarity solvent and then by a tape casting method, and the H-grade insulating film has excellent high and low temperature resistance, electrical insulation, cohesiveness, radiation resistance, medium resistance, chemical stability and flame retardance, so that the insulating protective property to a conductor wire core is good, and heat conduction and flame retardance can be realized.
The parts not involved in the process are the same as or can be implemented using the prior art.
Drawings
Fig. 1 is a flow chart of a method for producing a multilayer electric wire cable according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
Referring to fig. 1, a method for producing a multilayer wire cable includes the steps of:
s1: adding nonferrous metals such as copper, aluminum and alloy into a smelting furnace for smelting;
s2: injecting the smelted nonferrous metal into a mould, and condensing the nonferrous metal into an ingot shape for ingot casting;
s3: rolling the cast ingot-shaped nonferrous metal, pulling the rolled piece between rotating rollers by friction force, compressing and performing plastic deformation to make the rolled piece have a certain size and shape;
s4: drawing the rolled nonferrous metal, reducing the section, increasing the length and improving the strength of the nonferrous metal by using a drawing machine through one or more die holes of a drawing die, and obtaining the required cross-sectional area shape and size; the main technical parameter of wire drawing is a die matching technology;
s5: annealing the non-ferrous metal monofilament formed by wire drawing, slowly heating the non-ferrous metal monofilament to a certain temperature, keeping the temperature for enough time, and then slowly cooling the non-ferrous metal monofilament at a proper speed; the key of the annealing process is to prevent the oxidation of the nonferrous metal monofilament;
s6: a plurality of monofilaments are twisted together in a concentric layer twisting mode according to a specified direction by using a twisting machine, so that the flexibility and the integrity of a conductive wire core of the electric wire cable are improved, and the subsequent laying and installation are facilitated;
s7: the outer layer of the conductive wire core is extruded with a non-conductive insulating layer to isolate or wrap the conductive wire core so as to ensure the safe operation of electrical equipment, and the insulating layer comprises a polyimide film; the polyimide film is an H-grade insulating film produced by polycondensation of pyromellitic dianhydride and diaminodiphenyl ether in a high-polarity solvent and then by a tape casting method, and has excellent high and low temperature resistance, electrical insulation, cohesiveness, radiation resistance, medium resistance, chemical stability and flame retardance, so that the polyimide film has good insulation protection performance on conductor wire cores and can conduct heat conduction and flame retardance;
the main technical requirements of plastic insulation extrusion are that the eccentricity is an important mark for reflecting the extrusion process level, and the structural size and the deviation value of most products are clearly specified in the standard; smoothness is that the surface of the extruded insulating layer is required to be smooth, and the problems of rough surface, scorching and poor quality of impurities cannot be caused; the compactness is that the cross section of the extruded insulating layer is compact and firm, and cannot be provided with pinholes visible to naked eyes, so that the existence of air bubbles is avoided;
s8: twisting a plurality of insulated wire cores according to a certain rule, and completing filling of gaps among the wire cores and binding of the wire cores during twisting to complete cabling of the electric wire and the cable; the technical requirements of cabling are as follows: firstly, the twisting of the cable caused by the turning over of the opposite insulated wire core is avoided, and secondly, the insulating layer is prevented from being scratched; the filling ensures the roundness and stability of the cable after cabling, and the binding ensures that the cable core is not loose;
s9: an inner sheath isolation sleeve is extruded outside the cabled insulated wire core, then the inner sheath cushion layer is wound, and the insulated wire core is armored while the inner sheath cushion layer is wound, namely, a layer of metal protection is additionally arranged on the outermost surface of the insulated wire core, so that the inner insulated wire core and the inner sheath are prevented from being damaged during transportation and installation; the inner protective layer prevents the insulated wire core from being scratched by armor;
s10: the plastic outer sheath is directly extruded on the wire and the cable by using the plastic extruding machine, and the mechanical strength, elasticity, dimensional stability and solvent resistance of the plastic outer sheath are improved through cross-linking treatment;
s11: and (5) detecting finished products of the processed wires and cables, and packaging and warehousing the qualified products.
In the invention, in S1, the smelting temperature of the smelting furnace is 1100-1300 ℃.
In the present invention, in S3, the rolling process is cold rolling.
In the invention, in S5, the annealing function is to improve the toughness of the monofilament, reduce the hardness and residual stress of nonferrous metals, stabilize the size, reduce the deformation and crack tendency, refine the crystal grains and eliminate the tissue defects, so as to meet the requirements of the wire and the cable on the conductive wire core.
In the invention, in S6, in the stranding process, a pressing form is adopted, so that a common circle is changed into a semicircle, a sector, a tile shape and a pressed circle, the occupied area of the electric wire and the electric cable is reduced, and the geometric size of the electric wire and the electric cable is reduced.
In the present invention, in S6, the concentric layer twisting is performed by twisting the non-ferrous metal monofilaments layer by layer around the center of the stranded wire in order, with the twisting directions of adjacent layers being opposite.
In the invention, in S8, the cabling function is to meet the requirement of multiple cores of the electric wire, make the structure of the electric wire more stable, increase the flexibility of the electric wire, and make the three-phase magnetic field offset and reduce the loss.
In the invention, in S10, the outer sheath is used for improving the mechanical strength, chemical corrosion resistance, moisture resistance, water resistance and fire resistance of the electric wire and the electric cable.
Example 2
Referring to fig. 1, a method for producing a multilayer wire cable includes the steps of:
s1: adding nonferrous metals such as copper, aluminum and alloy into a smelting furnace for smelting;
s2: injecting the smelted nonferrous metal into a mould, and condensing the nonferrous metal into an ingot shape for ingot casting;
s3: rolling the cast ingot-shaped nonferrous metal, pulling the rolled piece between rotating rollers by friction force, compressing and performing plastic deformation to make the rolled piece have a certain size and shape;
s4: drawing the rolled nonferrous metal, reducing the section, increasing the length and improving the strength of the nonferrous metal by using a drawing machine through one or more die holes of a drawing die, and obtaining the required cross-sectional area shape and size; the main technical parameter of wire drawing is a die matching technology;
s5: annealing the non-ferrous metal monofilament formed by wire drawing, slowly heating the non-ferrous metal monofilament to a certain temperature, keeping the temperature for enough time, and then slowly cooling the non-ferrous metal monofilament at a proper speed; the key of the annealing process is to prevent the oxidation of the nonferrous metal monofilament;
s6: a plurality of monofilaments are twisted together in a concentric layer twisting mode according to a specified direction by using a twisting machine, so that the flexibility and the integrity of a conductive wire core of the electric wire cable are improved, and the subsequent laying and installation are facilitated;
s7: the outer layer of the conductive wire core is extruded with a non-conductive insulating layer to isolate or wrap the conductive wire core so as to ensure the safe operation of electrical equipment, and the insulating layer comprises a polyimide film; the polyimide film is an H-grade insulating film produced by polycondensation of pyromellitic dianhydride and diaminodiphenyl ether in a high-polarity solvent and then by a tape casting method, and has excellent high and low temperature resistance, electrical insulation, cohesiveness, radiation resistance, medium resistance, chemical stability and flame retardance, so that the polyimide film has good insulation protection performance on conductor wire cores and can conduct heat conduction and flame retardance;
the main technical requirements of plastic insulation extrusion are that the eccentricity is an important mark for reflecting the extrusion process level, and the structural size and the deviation value of most products are clearly specified in the standard; smoothness is that the surface of the extruded insulating layer is required to be smooth, and the problems of rough surface, scorching and poor quality of impurities cannot be caused; the compactness is that the cross section of the extruded insulating layer is compact and firm, and cannot be provided with pinholes visible to naked eyes, so that the existence of air bubbles is avoided;
s8: twisting a plurality of insulated wire cores according to a certain rule, and completing filling of gaps among the wire cores and binding of the wire cores during twisting to complete cabling of the electric wire and the cable; the technical requirements of cabling are as follows: firstly, the twisting of the cable caused by the turning over of the opposite insulated wire core is avoided, and secondly, the insulating layer is prevented from being scratched; the filling ensures the roundness and stability of the cable after cabling, and the binding ensures that the cable core is not loose;
s9: an inner sheath isolation sleeve is extruded outside the cabled insulated wire core, then the inner sheath cushion layer is wound, and the insulated wire core is armored while the inner sheath cushion layer is wound, namely, a layer of metal protection is additionally arranged on the outermost surface of the insulated wire core, so that the inner insulated wire core and the inner sheath are prevented from being damaged during transportation and installation; the inner protective layer prevents the insulated wire core from being scratched by armor;
s10: the plastic outer sheath is directly extruded on the wire and the cable by using the plastic extruding machine, and the mechanical strength, elasticity, dimensional stability and solvent resistance of the plastic outer sheath are improved through cross-linking treatment;
s11: and (5) detecting finished products of the processed wires and cables, and packaging and warehousing the qualified products.
In the present invention, in S1, the melting temperature of the melting furnace is 1200 ℃.
In the present invention, in S3, the rolling process is cold rolling.
In the invention, in S5, the annealing function is to improve the toughness of the monofilament, reduce the hardness and residual stress of nonferrous metals, stabilize the size, reduce the deformation and crack tendency, refine the crystal grains and eliminate the tissue defects, so as to meet the requirements of the wire and the cable on the conductive wire core.
In the invention, in S6, in the stranding process, a pressing form is adopted, so that a common circle is changed into a semicircle, a sector, a tile shape and a pressed circle, the occupied area of the electric wire and the electric cable is reduced, and the geometric size of the electric wire and the electric cable is reduced.
In the present invention, in S6, the concentric layer twisting is performed by twisting the non-ferrous metal monofilaments layer by layer around the center of the stranded wire in order, with the twisting directions of adjacent layers being opposite.
In the invention, in S8, the cabling function is to meet the requirement of multiple cores of the electric wire, make the structure of the electric wire more stable, increase the flexibility of the electric wire, and make the three-phase magnetic field offset and reduce the loss.
In the invention, in S10, the outer sheath is used for improving the mechanical strength, chemical corrosion resistance, moisture resistance, water resistance and fire resistance of the electric wire and the electric cable.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A method of producing a multilayer wire cable comprising the steps of:
s1: adding nonferrous metals such as copper, aluminum and alloy into a smelting furnace for smelting;
s2: injecting the smelted nonferrous metal into a mould, and condensing the nonferrous metal into an ingot shape for ingot casting;
s3: rolling the cast ingot-shaped nonferrous metal, pulling the rolled piece between rotating rollers by friction force, compressing and performing plastic deformation to make the rolled piece have a certain size and shape;
s4: drawing the rolled nonferrous metal, reducing the section, increasing the length and improving the strength of the nonferrous metal by using a drawing machine through one or more die holes of a drawing die, and obtaining the required cross-sectional area shape and size;
s5: annealing the non-ferrous metal monofilament formed by wire drawing, slowly heating the non-ferrous metal monofilament to a certain temperature, keeping the temperature for enough time, and then slowly cooling the non-ferrous metal monofilament at a proper speed;
s6: a plurality of monofilaments are twisted together in a concentric layer twisting mode according to a specified direction by using a twisting machine, so that the flexibility and the integrity of a conductive wire core of the electric wire cable are improved, and the subsequent laying and installation are facilitated;
s7: the outer layer of the conductive wire core is extruded with a non-conductive insulating layer to isolate or wrap the conductive wire core so as to ensure the safe operation of electrical equipment, and the insulating layer comprises a polyimide film;
s8: twisting a plurality of insulated wire cores according to a certain rule, and completing filling of gaps among the wire cores and binding of the wire cores during twisting to complete cabling of the electric wire and the cable;
s9: an inner sheath isolation sleeve is extruded outside the cabled insulated wire core, then the inner sheath cushion layer is wound, and the insulated wire core is armored while the inner sheath cushion layer is wound, namely, a layer of metal protection is additionally arranged on the outermost surface of the insulated wire core, so that the inner insulated wire core and the inner sheath are prevented from being damaged during transportation and installation;
s10: the plastic outer sheath is directly extruded on the wire and the cable by using the plastic extruding machine, and the mechanical strength, elasticity, dimensional stability and solvent resistance of the plastic outer sheath are improved through cross-linking treatment;
s11: and (5) detecting finished products of the processed wires and cables, and packaging and warehousing the qualified products.
2. The method of claim 1, wherein the melting temperature of the melting furnace in the step S1 is 1100-1300 ℃.
3. The method for manufacturing a multi-layer electric wire according to claim 1, wherein the rolling process in S3 is a cold rolling process.
4. The method as claimed in claim 1, wherein in step S5, the annealing is performed to improve the toughness of the monofilament, reduce the hardness and residual stress of the nonferrous metal, stabilize the dimension, reduce the tendency of deformation and crack, refine the crystal grains and eliminate the structural defects, so as to meet the requirements of the wire and cable for the conductive core.
5. The method as claimed in claim 1, wherein in step S6, the twisting process is performed in a pressing manner to change the general round shape into a semi-circle, a fan shape, a tile shape and a pressed round shape, so as to reduce the occupied area of the wire and cable and reduce the geometric dimension of the wire and cable.
6. The method of claim 1, wherein the concentric layer twisting in S6 is performed by twisting the non-ferrous metal monofilaments one by one around the center of the stranded wire in an orderly manner, and twisting the adjacent stranded layers in opposite directions.
7. The method as claimed in claim 1, wherein in S8, the cabling is used to satisfy the requirement of multiple cores of the cable, to make the cable structure more stable, to increase the flexibility of the cable, and to cancel the three-phase magnetic field and reduce the loss.
8. The method for producing a multilayer electric wire as claimed in claim 1, wherein the outer sheath in S10 is used to improve mechanical strength, chemical resistance, moisture resistance, water resistance and fire resistance of electric wire.
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| CN202110302946.3A CN113450970A (en) | 2021-03-22 | 2021-03-22 | Production method of multilayer wire and cable |
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| CN202110302946.3A CN113450970A (en) | 2021-03-22 | 2021-03-22 | Production method of multilayer wire and cable |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112038001A (en) * | 2020-08-27 | 2020-12-04 | 尚纬股份有限公司 | Manufacturing method of single-phase alternating current fireproof high-voltage cable for railway engineering |
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| CN109509593A (en) * | 2017-09-14 | 2019-03-22 | 上海电缆厂（南京）有限公司 | A kind of cable manufacturing process |
| CN110610783A (en) * | 2019-09-19 | 2019-12-24 | 尚纬股份有限公司 | Manufacturing method of control cable used in third-generation nuclear power station containment vessel |
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Application publication date: 20210928 |