CN116765157A - Preparation method of polygonal monofilaments of submarine cable - Google Patents
Preparation method of polygonal monofilaments of submarine cable Download PDFInfo
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- CN116765157A CN116765157A CN202310732733.3A CN202310732733A CN116765157A CN 116765157 A CN116765157 A CN 116765157A CN 202310732733 A CN202310732733 A CN 202310732733A CN 116765157 A CN116765157 A CN 116765157A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
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- 238000013461 design Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000005491 wire drawing Methods 0.000 claims abstract description 4
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- 238000013459 approach Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 abstract description 13
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
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Abstract
A preparation method of polygonal monofilaments of a submarine cable belongs to the technical field of submarine cables. Comprising the following steps: determining the approximate area of a monofilament section and the chamfer radius of a regular polygon; determining the diameter of an external circle of a regular polygon where the cross section of the monofilament is positioned, and selecting an existing circular monofilament drawing die combination similar to the diameter of the external circle; changing the die in the last several passes in the single wire drawing process; and (3) drawing the monofilaments, wherein in the drawing process, the annealing coefficient and the linear speed of the wire drawing machine are adjusted according to the structures of the monofilaments. According to the invention, the polygonal special-shaped monofilament is designed to replace the original trapezoid and Z/S molded lines, so that the structural stability of the conductor is improved, and the problems of difficult design and difficult manufacture of the traditional molded line monofilament are avoided; and the chamfer design is carried out on each corner, so that the filling of the water-blocking material is facilitated, and the requirements of the water-blocking conductor are met.
Description
Technical Field
The invention relates to a preparation method of polygonal monofilaments of a submarine cable, and belongs to the technical field of submarine cables.
Background
In recent years, with rapid development of offshore wind power projects, demands for medium-high voltage submarine cables and optical fiber composite submarine cables are increasing. The conductors of submarine cables are generally formed by twisting a plurality of round monofilaments by adopting a compressed round structure, and the compression coefficient of the conductors is gradually reduced along with the increase of the section of the conductors, so that the production process and the economic cost of the cables are negatively influenced. Therefore, a molded line conductor structure with higher filling coefficient is selected in the industry, and the main difference between the molded line conductor structure and the compressed circular structure is that the shape of the stranded monofilament is different, so that the compression coefficient of the conductor can be effectively improved, and the outer diameter of the conductor can be reduced.
However, the design and production of the molded filament are very complex, and especially the filament state needs to be noticed at all times during the production; meanwhile, the traditional molded line monofilaments are mostly trapezoid and Z/S molded lines, and because the sizes of the monofilaments of all layers are different, a plurality of sets of drawing dies are needed, and the rest monofilaments are inconvenient to store, so that great difficulty is brought to the production of the special-shaped monofilaments.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a preparation method of polygonal monofilaments of a submarine cable.
The technical scheme of the invention is as follows:
the preparation method of the polygonal monofilament of the submarine cable is characterized by comprising the following steps of:
(1) Design of monofilament
(1) Determining the approximate area S of a monofilament cross-section from the performance parameters of a cable 1 (based on the resistance of the cable,The number of the monofilaments in the cable and the material of the monofilaments determine the approximate area S of the cross section of the monofilaments 1 )；
(2) The section of the monofilament is of a regular polygon structure, and the area S is approximated according to the section of the monofilament 1 Determining the chamfering radius r of a regular polygon;
(3) determining the diameter d of an circumscribed circle of a regular polygon where the section of the monofilament is positioned;
(2) Processing of monofilaments
(1) Selecting an existing circular monofilament drawing die combination similar to the diameter d of the circumscribed circle according to the diameter d of the circumscribed circle of the regular polygon where the cross section of the monofilament is positioned (selecting a circular monofilament drawing die similar to the diameter d, and fully utilizing the existing circular monofilament drawing die);
(2) the die in the last n passes in the monofilament drawing process is replaced by a corresponding regular polygon monofilament drawing die (the die is reasonably matched according to the area reduction ratio, and the dies in the later passes are optionally replaced); wherein m is a natural number, and m is more than or equal to 1;
(3) and (3) drawing the monofilaments, wherein in the drawing process, the annealing coefficient and the linear speed of the wire drawing machine are adjusted according to the structures of the monofilaments.
The special-shaped monofilament structure adopted by the invention is a regular polygon structure with a cross section (similar to that of the special-shaped monofilament structure), so that the special-shaped monofilament structure is convenient to draw and can avoid quality problems such as turn-over and the like in the manufacturing process; chamfering is carried out at the corners of the regular polygon, so that the production and the filling of water-blocking materials are facilitated, and meanwhile, the phenomenon of tip discharge when the regular polygon is applied to a high-voltage circuit can be avoided; during processing, one or two special-shaped monofilament drawing dies can be selectively added on the basis of the existing round monofilament drawing dies, so that the monofilaments with different specifications can be quickly drawn.
Further, since the chamfer size directly affects the actual production difficulty and the final compression coefficient of the special-shaped monofilament, the smaller the difference between the approximate area and the actual area of the cross section of the monofilament is, the smaller the chamfer radius is, so in the primary design process, the chamfer radius is obtained according to the following table 1 according to the required approximate area of the cross section of the monofilament:
TABLE 1 relationship of approximate area and chamfer of regular polygon monofilament section
Further, in the step (1), determining the circumscribed circle diameter d of the regular polygon where the cross section of the monofilament is located, including the following steps:
A. known approximate area S of monofilament cross section 1 The number of the edges of the regular polygon is n, and the approximate diameter d of the circumscribed circle is calculated by the following regular polygon area formula 1 ：
B. Known approximate diameter d of circumscribed circle 1 Calculating the approximate area S 'of the cross section of the monofilament by using the chamfering radius r and the edge number of the regular polygon and utilizing the BO instruction of CAD drawing software' 1 ；
C. Due to the approximate area S 'of the monofilament cross section' 1 Less than the approximate area S of the cross section of the monofilament 1 To get maximum approach to S 1 Considering that the dimension processing precision of the diameter direction of the drawing die is controlled within 0.01mm, the approximate diameter d of the circumcircle is set 2 ＝d 1 +0.01；
Known approximate diameter d of circumscribed circle 2 Calculating the approximate area S of the cross section of the monofilament by using the chamfering radius r and the edge number of the regular polygon and utilizing the BO instruction of CAD drawing software 2 ；
D. In S' 1 、S 2 Is selected to be closest to the approximate area S 1 As the final monofilament cross-sectional area S, the corresponding circumscribed circle diameter is designated as the final circumscribed circle diameter d.
Further, in step (2), according to q=k 1 ·Q 0 Adjusting annealing coefficient, wherein Q is polygonal monofilament annealing coefficient, Q 0 Is the annealing coefficient k of the existing round monofilament with the diameter d similar to that of the circumscribing circle 1 Is the ratio of the perimeter of the cross section of the existing circular monofilament to the perimeter of the cross section of the polygonal monofilament. According to v=k2·v 0 Adjusting the linear speed, wherein V is polygonalLinear speed of filament production, V 0 Is the linear speed, K of the existing round monofilament with the diameter similar to the diameter d of the circumcircle 2 Is the ratio of the polygonal monofilament cross-sectional area to the existing circular monofilament cross-sectional area.
After drawing the filaments, there may be some internal stresses in the conductor due to cold deformation of the metal, which stresses may reduce the electrical properties of the conductor. To reduce these internal stresses, it is often necessary to anneal the filaments. In the traditional special-shaped monofilament drawing production, the existing annealing scheme corresponding to the round monofilament is not suitable for the traditional special-shaped monofilament, the conditions of incomplete annealing, even excessive fire and the like are easy to occur, the quality of a product is influenced, and therefore operators usually debug according to the past experience, and the result is uneven.
The annealing temperature of conventional profiled monofilaments is generally higher than that of conventional round monofilaments because the profiled monofilaments have irregular cross-sectional shapes and relatively complex internal stresses, thus requiring higher temperatures to relieve these stresses. In the invention, the regular polygon monofilament has symmetrical structure and similar to a circle, and the internal structure and the stress of the regular polygon monofilament are simpler than those of the traditional special shape, so that the existing round monofilament annealing scheme similar to the circumcircle of the regular polygon monofilament can be selected, and the adaptability improvement production is carried out on the basis of the scheme, thereby greatly reducing the difficulty of drawing the monofilament. The invention can avoid the quality problem caused by the fact that the parameters of equipment are adjusted by experience when the original special-shaped monofilaments are processed by adjusting the annealing coefficient, the production line speed and the like.
In addition, because the molded line has complex structure and excessive influencing factors during mold matching, the drawing pass can be increased during actual production, and the ductility of the material cannot be well exerted.
Compared with the prior art, the polygonal special-shaped monofilament is designed to replace the original trapezoid and Z/S molded lines, so that the structural stability of the conductor is improved, and the problems of difficult design and difficult manufacture of the traditional molded line monofilament are avoided; and the chamfer design is carried out on each corner, so that the filling of the water-blocking material is facilitated, and the requirements of the water-blocking conductor are met. The processing method of the invention can be quickly improved on the basis of the existing equipment, so that the equipment has the capability of quickly drawing the type of monofilaments; secondly, the invention can systematically adjust the equipment parameters, avoid the quality problem brought by the original processing method, and simultaneously can fully improve the equipment productivity; thirdly, the existing circular monofilament drawing die can be utilized, and the cost is greatly saved.
Drawings
FIG. 1 is a schematic cross-sectional view of a regular hexagonal monofilament according to an embodiment of the present invention;
in the figure: 1. a profiled monofilament; 2. chamfering special-shaped monofilaments; 3. the special-shaped monofilaments are externally connected with circles.
Detailed Description
Example 1
The preparation method of the polygonal monofilament of the submarine cable comprises the steps of designing and processing the polygonal monofilament, wherein:
1. design of regular polygon monofilament
S1: determining the approximate area S of the monofilament section according to the parameters such as the resistance value of the cable, the number of the monofilaments in the cable, the monofilament material and the like 1 ；
S2: the section of the monofilament is of a regular polygon structure, and the area S is approximated according to the section of the monofilament 1 Determining the chamfering radius r of a regular polygon:
TABLE 1 relationship of approximate area and chamfer of regular polygon monofilament section
S3: known approximate area S of monofilament cross section 1 The number of the edges of the regular polygon is n, and the approximate diameter d of the circumscribed circle is calculated by the following regular polygon area formula 1 ：
S4: known approximate diameter d of circumscribed circle 1 Calculating the approximate area S 'of the monofilament section by using CAD drawing software, wherein the chamfer radius r and the edge number of the regular polygon' 1 ；
S5: due to the approximate area S 'of the monofilament cross section' 1 Less than the approximate area S of the cross section of the monofilament 1 To get maximum approach to S 1 Considering that the dimension processing precision of the diameter direction of the drawing die is controlled within 0.01mm, the approximate diameter d of the circumcircle is set 2 ＝d 1 +0.01；
Known approximate diameter d of circumscribed circle 2 Calculating the approximate area S of the section of the monofilament by using CAD drawing software, wherein the chamfer radius r and the edge number of the regular polygon 2 ；
S6: in S' 1 、S 2 Is selected to be closest to the approximate area S 1 As the final monofilament cross-sectional area S, the corresponding circumscribed circle diameter is the final circumscribed circle diameter d;
s7: naming: (L-circumscribed circle diameter-chamfer radius) (L-d-r);
2. processing of regular polygon monofilaments
S1: selecting an existing circular monofilament drawing die combination with the diameter similar to d according to the diameter d of the circumscribed circle of the regular polygon where the monofilament section is positioned;
s2: for the mould in the single filament drawing process, the last m moulds are selectively replaced with corresponding special moulds, wherein m is a natural number, and m is more than or equal to 1;
s3: sequentially passing polygonal monofilaments through a die;
s4: according to q=k 1 ·Q 0 Adjusting annealing coefficient, wherein Q is polygonal monofilament annealing coefficient, Q 0 Is the annealing coefficient k of the existing round monofilament with the diameter d similar to that of the circumscribing circle 1 Ensuring the product quality for the ratio of the perimeter of the cross section of the circular monofilament to the perimeter of the cross section of the polygonal monofilament;
s5: according to v=k 2 ·V 0 Adjusting the linear speed, wherein V is the linear speed of the polygonal monofilament, V 0 Is straight to the external circleThe linear speed, K of the existing round monofilament with similar diameter d 2 Is the ratio of the polygonal monofilament cross-sectional area to the circular monofilament cross-sectional area;
s6: adjusting the wire winding width and setting the wire winding meter number;
s7: drawing monofilaments to check tensile strength, resistance and outer diameter;
s8: fine tuning is carried out;
s9: normal production.
Example 2
1. Monofilament design
S1: the regular hexagonal monofilament cross section is shown in figure 1, and the approximate area S 1 ＝9.22mm 2 ；
S2: from table 1: chamfer radius r=0.3 mm;
s3: the diameter d of the circumscribed circle is obtained by a polygonal formula (regular hexagon) 1 ＝3.77mm：
S4: known approximate diameter d of circumscribed circle 1 Calculating the approximate area S 'of the monofilament section by using CAD drawing software, wherein the chamfer radius r and the edge number of the regular polygon' 1 ＝9.20mm 2 ；
S5: due to the approximate area S 'of the monofilament cross section' 1 Less than the approximate area S of the cross section of the monofilament 1 To get maximum approach to S 1 The dimension processing precision of the drawing die in the diameter direction is controlled within 0.01mm, and the approximate diameter d of the circumcircle is set 2 ＝d 1 +0.01＝3.78mm；
Known approximate diameter d of circumscribed circle 2 Calculating the approximate area S of the section of the monofilament by using CAD drawing software, wherein the chamfer radius r and the edge number of the regular polygon 2 ＝9.25mm 2 ；
S6: in S' 1 、S 2 Is selected to be closest to the approximate area S 1 As a final monofilament cross-sectional area s= 9.22mm 2 The corresponding circumscribed circle diameter is taken as the final circumscribed circle diameter d=3.77 mm;
s7: naming: l-3.77-0.3.
2. Monofilament processing
S1: selecting a round monofilament drawing die combination with the diameter of 3.80 mm;
s2: the last mould (outlet mould) is replaced by a special-shaped mould;
s3: sequentially passing the polygonal monofilaments through a die;
s4: an annealing scheme of round monofilaments with a diameter of 3.80mm is selected;
according to q=k 1 ·Q 0 Adjusting annealing coefficient, wherein Q is polygonal monofilament annealing coefficient, Q 0 Is the annealing coefficient, k of round monofilaments with similar diameters 1 Is the ratio of the perimeter of the cross section of the circular monofilament to the perimeter of the cross section of the polygonal monofilament;
namely: k (k) 1 Circular monofilament cross-sectional perimeter/regular polygonal monofilament cross-sectional perimeter= 23.876/22.426 = 1.0647;
s5: according to v=k 2 ·V 0 Adjusting the linear speed, wherein V is the linear speed of the polygonal monofilament, V 0 Is the linear speed, K of the round monofilament with similar diameter 2 Is the ratio of the cross-sectional area of the polygonal monofilaments to the cross-sectional area of the circular monofilaments;
namely: k (K) 2 The regular polygon monofilament cross section/round monofilament cross section area=9.22/11.16=0.83, and the production line speed v=kxv0 is adjusted to ensure the product quality;
s6: adjusting the wire-rewinding width and setting the wire-rewinding meter number;
s7: drawing monofilaments to check tensile strength, resistance and outer diameter;
s8: fine tuning is carried out;
s9: normal production.
Claims (6)
1. The preparation method of the polygonal monofilament of the submarine cable is characterized by comprising the following steps of:
(1) Design of monofilament
(1) Determining the approximate area S of a monofilament cross-section from the performance parameters of a cable 1 ；
(2) The sheet isThe section of the filament is of a regular polygon structure, and the area S is approximated according to the section of the monofilament 1 Determining the chamfering radius r of a regular polygon;
(3) determining the diameter d of an circumscribed circle of a regular polygon where the section of the monofilament is positioned;
(2) Processing of monofilaments
(1) Selecting an existing circular monofilament drawing die combination similar to the circumscribed circle diameter d according to the circumscribed circle diameter d of the regular polygon where the monofilament section is positioned;
(2) replacing the die in the last m passes in the monofilament drawing process with a corresponding regular polygon monofilament drawing die; wherein m is a natural number, and m is more than or equal to 1;
(3) and (3) drawing the monofilaments, wherein in the drawing process, the annealing coefficient and the linear speed of the wire drawing machine are adjusted according to the structures of the monofilaments.
2. The method for preparing polygonal monofilaments of a submarine cable according to claim 1, wherein in the step (1), the approximate area S of the cross section of the monofilaments is determined according to the resistance value of the cable, the number of the monofilaments in the cable and the material of the monofilaments 1 。
3. The method for producing polygonal monofilaments of a submarine cable according to claim 2, wherein in the step (1), the chamfer radius r of the regular polygon is determined according to table 1, and the following table 1 is the approximate area S of the cross section of the regular polygon monofilaments 1 Relationship with regular polygon chamfer r:
table 1 the relationship between the approximate area of the regular polygon monofilament cross section and the chamfer angle.
4. A method for preparing a polygonal monofilament of a submarine cable according to claim 3, wherein in the step (1), the diameter d of the circumscribed circle of the regular polygon on which the cross section of the monofilament is located is determined, comprising the steps of:
A. known approximate area S of monofilament cross section 1 The number of the edges of the regular polygon is n, and the approximate diameter d of the circumscribed circle is calculated by the following regular polygon area formula 1 ：
B. Known approximate diameter d of circumscribed circle 1 Calculating the approximate area S 'of the monofilament section by using CAD drawing software, wherein the chamfer radius r and the edge number of the regular polygon' 1 ；
C. Due to the approximate area S 'of the monofilament cross section' 1 Less than the approximate area S of the cross section of the monofilament 1 To get maximum approach to S 1 Considering that the dimension processing precision of the diameter direction of the drawing die is controlled within 0.01mm, the approximate diameter d of the circumcircle is set 2 ＝d 1 +0.01；
Known approximate diameter d of circumscribed circle 2 Calculating the approximate area S of the section of the monofilament by using CAD drawing software, wherein the chamfer radius r and the edge number of the regular polygon 2 ；
D. In S' 1 、S 2 Is selected to be closest to the approximate area S 1 The corresponding circumscribed circle diameter is the final circumscribed circle diameter d as the final monofilament cross-sectional area S.
5. A method for preparing a polygonal monofilament for a submarine cable according to claim 1 or 4, wherein in step (2), according to q=k 1 ·Q 0 Adjusting annealing coefficient, wherein Q is polygonal monofilament annealing coefficient, Q 0 Is the annealing coefficient k of the existing round monofilament with the diameter d similar to that of the circumscribing circle 1 Is the ratio of the perimeter of the cross section of the existing circular monofilament to the perimeter of the cross section of the polygonal monofilament.
6. The method for producing a polygonal monofilament of a submarine cable according to claim 5, wherein in the step (2),according to v=k 2 ·V 0 Adjusting the linear speed, wherein V is the linear speed of the polygonal monofilament, V 0 Is the linear speed, K of the existing round monofilament with the diameter similar to the diameter d of the circumcircle 2 Is the ratio of the polygonal monofilament cross-sectional area to the existing circular monofilament cross-sectional area.
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