CN113123149A - Steel cord with glue permeation structure and preparation method thereof - Google Patents
Steel cord with glue permeation structure and preparation method thereof Download PDFInfo
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- CN113123149A CN113123149A CN202110434260.XA CN202110434260A CN113123149A CN 113123149 A CN113123149 A CN 113123149A CN 202110434260 A CN202110434260 A CN 202110434260A CN 113123149 A CN113123149 A CN 113123149A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 158
- 239000010959 steel Substances 0.000 title claims abstract description 158
- 239000003292 glue Substances 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000011295 pitch Substances 0.000 claims abstract description 16
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 14
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000005482 strain hardening Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 7
- 238000009713 electroplating Methods 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 238000004381 surface treatment Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910000746 Structural steel Inorganic materials 0.000 abstract description 7
- 238000010073 coating (rubber) Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000012466 permeate Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
- D07B1/0633—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration having a multiple-layer configuration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/066—Reinforcing cords for rubber or plastic articles the wires being made from special alloy or special steel composition
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/10—Rope or cable structures
- D07B2201/1012—Rope or cable structures characterised by their internal structure
- D07B2201/102—Rope or cable structures characterised by their internal structure including a core
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/2006—Wires or filaments characterised by a value or range of the dimension given
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/201—Wires or filaments characterised by a coating
- D07B2201/2011—Wires or filaments characterised by a coating comprising metals
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2038—Strands characterised by the number of wires or filaments
- D07B2201/204—Strands characterised by the number of wires or filaments nine or more wires or filaments respectively forming multiple layers
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2052—Cores characterised by their structure
- D07B2201/2059—Cores characterised by their structure comprising wires
- D07B2201/2061—Cores characterised by their structure comprising wires resulting in a twisted structure
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3025—Steel
- D07B2205/3028—Stainless steel
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3085—Alloys, i.e. non ferrous
- D07B2205/3089—Brass, i.e. copper (Cu) and zinc (Zn) alloys
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/202—Environmental resistance
- D07B2401/2025—Environmental resistance avoiding corrosion
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/2055—Improving load capacity
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/208—Enabling filler penetration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2046—Tire cords
Abstract
The invention discloses a steel cord with a glue permeation structure, which comprises a monofilament with the diameter of d0 of a core filament and n layer filaments twisted around the core filament in the same twisting direction and different twisting pitches; the layer silk includes intermediate layer silk and outer layer silk, and the intermediate layer silk includes that 4 diameters are the monofilament of d1, and outer layer silk includes that 9 diameters are the monofilament of d2, and wherein the diameter of core silk, intermediate layer monofilament and outer layer monofilament satisfies following relation: d0 < d1 < d 2; gaps L are reserved among the outer layer filament monofilaments, and gaps L1 are reserved among the middle layer filament monofilaments. The invention also discloses a preparation method of the steel cord with the glue permeation structure, which comprises the following steps: preparing three wet-drawn steel wires with the diameters of d0, d1 and d2 respectively, twisting the wet-drawn steel wires into structural steel wires of '1 +4+ 9' to obtain the steel cord with the glue permeation performance. The improvement of the rubber coating performance of the invention can improve the corrosion resistance, fatigue resistance, impact resistance and bonding retention of the tire and prolong the service life of the tire.
Description
Technical Field
The invention belongs to the field of steel cords, and particularly relates to a steel cord with a glue permeation structure and a preparation method thereof.
Background
The steel cord is an important component in a radial tire framework material, and the compact steel cord is widely manufactured and applied due to good fatigue performance. The compact steel cord forms a compact cross-sectional configuration by accommodating a large number of filaments over a limited cross-section. The tight steel cord is arranged too tightly between the single filaments and between the layers, when the tight steel cord is vulcanized with rubber, rubber viscous fluid cannot permeate into the single filaments of the middle layer of the steel cord, the air content of the inner layer of the steel cord is high due to low rubber permeation rate, the corrosion resistance of the steel cord is reduced, and the quality of the tire is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a steel cord with a rubber permeation structure and a preparation method thereof, gaps are formed between the filaments of the middle layer of the steel cord and between the filaments of the outer layer of the steel cord to form the rubber permeation structure, rubber adhesive fluid can fully permeate and embed the rubber adhesive fluid around each filament of the steel cord through the gaps between the filaments when the rubber adhesive fluid is vulcanized with rubber, the permeation performance of the rubber is greatly improved, the stability and the anchoring performance of the cord structure are effectively improved, the improvement of the rubber coating performance can improve the corrosion resistance, the fatigue resistance, the impact resistance and the adhesion retention of the tire, and the service life of the tire is prolonged.
In order to solve the above technical problems, the present invention provides a steel cord having a rubberizing structure, the steel cord comprising a single filament having a core filament diameter d0, and n layer filaments twisted around the core filament in the same twist direction and different twist pitches; the layer silk includes intermediate layer silk and outer layer silk, and the intermediate layer silk includes that 4 diameters are the monofilament of d1, and outer layer silk includes that 9 diameters are the monofilament of d2, and wherein the diameter of core silk, intermediate layer monofilament and outer layer monofilament satisfies following relation: d0 < d1 < d 2; gaps L are reserved among the outer layer filament monofilaments, and gaps L1 are reserved among the middle layer filament monofilaments to form a glue permeation structure. The steel cord of the structure not only has a compact and stable structure, but also leaves effective gaps to meet the needs of glue permeation. The formed gaps L are uniformly distributed in the circumferential direction, and rubber viscous fluid permeates into the gaps of the steel cord intermediate layer L1 from the direction of 360 degrees and fully permeates and is embedded around each monofilament, so that moisture is prevented from permeating into the gaps of steel wires in the steel cord along the steel cord, and the corrosion resistance and the fatigue resistance of the steel cord in the tire are improved.
Preferably, the d0, d1 and d2 satisfy the following relationships:
0.42＜(d0/d1)＜0.80；
1.00＜(d2/d1)＜1.2；
d0 is between 0.08 and 0.22 mm.
Preferably, the d0, d1 and d2 satisfy the following relationships:
0.50＜(d0/d1)＜0.640；
1.05＜(d2/d1)＜1.18；
d0 is between 0.095-0.20 mm.
Preferably, the average width of the gaps L between the filaments of the outer layer is not less than 0.028mm, and the average width of the gaps L1 between the filaments of the middle layer is not less than 0.025 mm.
The invention also provides a preparation method of the steel cord with the glue permeation structure, which comprises the following steps:
preparing three wet-drawn steel wires with the diameters of d0, d1 and d2 respectively;
selecting a wet-drawn steel wire with the diameter of d0 as a core wire, selecting 4 wet-drawn steel wires with the diameter of d1 as intermediate layer monofilaments, and twisting the core wire and the 4 intermediate layer monofilaments into a '1 + 4' central strand;
selecting 9 wet-drawn steel wires with the diameter d2 as outer layer monofilaments, twisting the central strand and the 9 outer layer monofilaments into a steel wire with a structure of '1 +4+ 9', and obtaining the steel cord with the rubber-infiltrated structure.
Preferably, the method of preparing three wet drawn steel wires having diameters d0, d1 and d2, respectively, is:
performing surface treatment on the wire rod, performing rough drawing, then performing intermediate drawing to obtain a dry-drawn steel wire, and performing heat treatment to remove work hardening before intermediate drawing;
sequentially carrying out austenitizing treatment and water bath quenching treatment on the dry-drawn steel wire, and then electroplating thermal diffusion to obtain the steel wire with the surface plated with the copper-zinc alloy;
and (3) carrying out wet drawing on the steel wire plated with the copper-zinc alloy to obtain three kinds of wet-drawn steel wires with the diameters of d0, d1 and d2 respectively.
Preferably, the wire rod has a diameter of 5.5mm, is subjected to heat treatment to remove work hardening after being roughly drawn to a diameter of 2.80-3.14mm, and then is subjected to dry drawing to a diameter of 0.82-2.20 mm.
Preferably, the wire rod comprises the following components in percentage by weight: 0.60-1.02% of C, 0.30-0.70% of Mn, 0.15-0.30% of Si, no more than 0.030% of P, no more than 0.030% of S, no more than 0.35% of Cr, and Fe as the other component.
Preferably, the twisting is performed by a double twisting machine.
The invention achieves the following beneficial effects: according to the steel cord with the rubber-impregnated structure, the size and the proportion of each layer of monofilament are controlled, so that the steel cord with a stable structure can be obtained, the average width of gaps L between outer layer filament monofilaments is not less than 0.028mm, and the average width of gaps L1 between middle layer filament monofilaments is not less than 0.025mm, so that gaps are formed between the steel cord middle layer filament monofilaments and between the outer layer filament monofilaments to form the rubber-impregnated structure, rubber adhesive fluid can fully penetrate and be embedded around each steel cord monofilament through the gaps between the monofilaments during vulcanization of rubber, the rubber infiltration performance is greatly improved, the stability and the anchorage of the cord structure are effectively improved, the improvement of the rubber coating performance can improve the corrosion resistance, the fatigue resistance, the impact resistance and the adhesive retention of a tire, and the service life of the tire is prolonged. The structural steel cord is low in linear density, and the production cost of the tire can be effectively reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of a steel cord having a rubberized structure according to the present invention;
wherein: 11-core filament, 22-intermediate layer filament, 33-outer layer filament.
FIG. 2 is a twinning machine;
wherein: 1. the machine comprises a main machine, 2. an external over-twisting step, 3. a distributing plate, 4. a traction wheel, 5. a spool and 6. a core machine.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a steel cord having a rubberized structure, the steel cord comprising one monofilament having a core filament 11 diameter d0, and n layer filaments twisted around said core filament 11 in the same twist direction and different twist pitches, the layer filaments comprising a middle layer filament 22 and an outer layer filament 33, the middle layer filament 22 consisting of 4 monofilaments having a diameter d1, and the outer layer filament 33 consisting of 9 monofilaments having a diameter d2, wherein the monofilaments have a diameter d0 < d1 < d 2. The steel cord manufactured by controlling the ratio of the monofilaments of each layer of the steel cord can ensure that the average width of gaps L formed among the monofilaments of the outer layer 33 is at least 0.028mm, the average width of the gaps L1 formed among the monofilaments of the middle layer 22 is at least 0.025mm, and further, rubber viscous fluid can smoothly permeate into the gaps L1 of the monofilaments of the middle layer 22 of the steel cord.
A preparation method of a steel cord with a rubberizing structure comprises the following preparation steps;
carrying out surface treatment on a wire rod with the diameter of 5.5mm, then carrying out rough drawing to obtain a steel wire with the diameter of 2.80-3.14mm, then carrying out intermediate drawing to obtain a dry-drawn steel wire with the diameter of 0.80-2.20mm, and also carrying out heat treatment before intermediate drawing to remove work hardening; (2) sequentially carrying out austenitizing treatment and water bath quenching treatment on the dry-drawn steel wire, and then electroplating thermal diffusion to obtain the steel wire with the surface plated with the copper-zinc alloy; (3) carrying out wet drawing on the steel wire plated with the copper-zinc alloy to obtain three wet-drawn steel wires with the diameters of d0, d1 and d2 respectively; (4) selecting a wet-drawn steel wire with the diameter of d0 as a core wire, selecting 4 wet-drawn steel wires with the diameter of d1 as intermediate layer monofilaments, twisting one core wire and 4 intermediate layer monofilaments into a '1 + 4' central strand by a core machine of a double-twisting machine (shown in figure 2), selecting 9 wet-drawn steel wires with the diameter of d2 as outer layer monofilaments, and twisting the central strand and 9 outer layer monofilaments into a '1 +4+ 9' structural steel wire by the double-twisting machine (shown in figure 1).
The steel cord adopts the steel wire rod as the raw material, and the steel wire rod used by the steel wire comprises the following components in percentage by weight: 0.60-1.02% of C, 0.30-0.70% of Mn, 0.15-0.30% of Si, no more than 0.030% of P, no more than 0.030% of S, no more than 0.35% of Cr, and Fe as the other component.
Example 1
A steel cord with a rubberized structure, the steel cord comprising a single filament with a diameter d0 of 0.11mm of a core filament 11, and n layer filaments twisted around said core filament 11 in the same twist direction and with different twist pitches, the layer filaments comprising intermediate layer filaments 22 and outer layer filaments 33, the intermediate layer filaments 22 consisting of 4 single filaments with a diameter d1 of 0.18mm, the outer layer filaments 33 consisting of 9 single filaments with a diameter d2 of 0.20mm, the twist pitch of the steel filaments of the intermediate layer 22 being 6.3mm, the twist pitch of the steel filaments of the outer layer 33 being 12.5 mm.
The preparation method of the steel cord of the present example 1 includes the steps of:
(1) carrying out surface treatment on a wire rod with the diameter of 5.5mm, carrying out rough drawing, drawing to the diameter of 2.80-3.14mm, carrying out normalizing treatment to remove work hardening, and then carrying out middle drawing to obtain a dry-drawn steel wire with the diameter of 0.82mm, 1.22mm and 1.35 mm; (2) sequentially carrying out austenitizing treatment and water bath quenching treatment on the dry-drawn steel wire, and then electroplating thermal diffusion to obtain the steel wire with the surface plated with the copper-zinc alloy; (3) carrying out wet drawing on the steel wire plated with the copper-zinc alloy to obtain three wet-drawn steel wires with the diameters of 0.11mm, 0.18mm and 0.20mm respectively; (4) selecting a wet-drawn steel wire with the diameter of 0.11mm as a core wire, selecting 4 wet-drawn steel wires with the diameter of 0.18mm as intermediate layer monofilaments, twisting one core wire and 4 intermediate layer monofilaments into a 1 multiplied by 0.11+4 multiplied by 0.18 central strand by a core machine of a double twisting machine (shown in figure 2), selecting nine wet-drawn steel wires with the diameter of 0.20mm as outer layer monofilaments, and twisting the central strand and nine outer layer monofilaments into a 1 multiplied by 0.11+4 multiplied by 0.18+9 multiplied by 0.20 structural steel wire (shown in figure 1) by the double twisting machine.
Example 2
A steel cord with a rubberized structure, the steel cord comprising a single filament with a diameter d0 of 0.12mm of a core filament 11, and n layer filaments twisted around said core filament 11 in the same twist direction and with different twist pitches, the layer filaments comprising intermediate layer filaments 22 and outer layer filaments 33, the intermediate layer filaments 22 consisting of 4 single filaments with a diameter d1 of 0.20mm, the outer layer filaments 33 consisting of 9 single filaments with a diameter d2 of 0.225mm, the twist pitch of the steel filaments of the intermediate layer 22 being 7.0mm, the twist pitch of the steel filaments of the outer layer 33 being 14.0 mm.
The preparation method of the steel cord of the present example 2 includes the steps of:
(1) carrying out surface treatment on a wire rod with the diameter of 5.5mm, carrying out rough drawing, drawing to the diameter of 2.80-3.14mm, carrying out normalizing treatment to remove work hardening, and then carrying out middle drawing to obtain a dry-drawn steel wire with the diameter of 0.82mm, 1.35mm and 1.55 mm; (2) sequentially carrying out austenitizing treatment and water bath quenching treatment on the dry-drawn steel wire, and then electroplating thermal diffusion to obtain the steel wire with the surface plated with the copper-zinc alloy; (3) carrying out wet drawing on the steel wire plated with the copper-zinc alloy to obtain three wet-drawn steel wires with the diameters of 0.12mm, 0.20mm and 0.225mm respectively; (4) selecting a wet-drawn steel wire with the diameter of 0.12mm as a core wire, selecting 4 wet-drawn steel wires with the diameter of 0.20mm as intermediate layer monofilaments, twisting one core wire and 4 intermediate layer monofilaments into a 1 multiplied by 0.12+4 multiplied by 0.20 central strand by a core machine of a double twisting machine (shown in figure 2), selecting nine wet-drawn steel wires with the diameter of 0.225mm as outer layer monofilaments, and twisting the central strand and nine outer layer monofilaments into a 1 multiplied by 0.12+4 multiplied by 0.20+9 multiplied by 0.225 structural steel wire (shown in figure 1) by the double twisting machine.
Example 3
A steel cord with a rubberizing structure, the steel cord comprising a single filament with a diameter d0 of 0.13mm of a core filament 11, and n layer filaments twisted around said core filament 11 in the same twist direction and with different twist pitches, the layer filaments comprising intermediate layer filaments 22 and outer layer filaments 33, the intermediate layer filaments 22 consisting of 4 single filaments with a diameter d1 of 0.22mm, the outer layer filaments 33 consisting of 9 single filaments with a diameter d2 of 0.245mm, the twist pitch of the steel filaments of the intermediate layer 22 being 8.0mm, the twist pitch of the steel filaments of the outer layer 33 being 16.0 mm.
The preparation method of the steel cord of the present example 3 includes the steps of:
(1) carrying out surface treatment on a wire rod with the diameter of 5.5mm, carrying out rough drawing, drawing to the diameter of 2.80-3.14mm, carrying out normalizing treatment to remove work hardening, and then carrying out middle drawing to obtain a dry-drawn steel wire with the diameter of 0.82mm, 1.40mm and 1.60 mm; (2) sequentially carrying out austenitizing treatment and water bath quenching treatment on the dry-drawn steel wire, and then electroplating thermal diffusion to obtain the steel wire with the surface plated with the copper-zinc alloy; (3) carrying out wet drawing on the steel wire plated with the copper-zinc alloy to obtain three wet-drawn steel wires with the diameters of 0.13mm, 0.22mm and 0.245mm respectively; (4) selecting a wet-drawn steel wire with the diameter of 0.13mm as a core wire, selecting 4 wet-drawn steel wires with the diameter of 0.22mm as intermediate layer monofilaments, twisting one core wire and 4 intermediate layer monofilaments into a 1 multiplied by 0.13+4 multiplied by 0.22 central strand by a core machine of a double twisting machine (shown in figure 2), selecting nine wet-drawn steel wires with the diameter of 0.245mm as outer layer monofilaments, and twisting the central strand and nine outer layer monofilaments into a 1 multiplied by 0.13+4 multiplied by 0.22+9 multiplied by 0.245 structural steel wire (shown in figure 1) by the double twisting machine.
Example 4
A steel cord having a rubberized structure, the steel cord comprising a single filament having a core filament 11 diameter d0 of 0.185mm, and n layer filaments twisted around said core filament 11 in the same twist direction and different twist pitches, the layer filaments comprising intermediate layer filaments 22 and outer layer filaments 33, the intermediate layer filaments 22 being composed of 4 single filaments having a diameter d1 of 0.33mm, the outer layer filaments 33 being composed of 9 single filaments having a diameter d2 of 0.38mm, the twist pitch of the steel filaments of the intermediate layer 22 being 10.0mm, and the twist pitch of the steel filaments of the outer layer 33 being 20.0 mm.
The preparation method of the steel cord of the present example 4 includes the steps of:
(1) carrying out surface treatment on a wire rod with the diameter of 5.5mm, carrying out rough drawing, and carrying out middle drawing after the wire rod is drawn to the diameter of 2.80-3.14mm to obtain a dry-drawn steel wire with the diameter of 1.15mm, 1.94mm and 2.05 mm; (2) sequentially carrying out austenitizing treatment and water bath quenching treatment on the dry-drawn steel wire, and then electroplating thermal diffusion to obtain the steel wire with the surface plated with the copper-zinc alloy; (3) carrying out wet drawing on the steel wire plated with the copper-zinc alloy to obtain three wet-drawn steel wires with the diameters of 0.185mm, 0.33mm and 0.38mm respectively; (4) selecting a wet-drawn steel wire with the diameter of 0.185mm as a core wire, selecting 4 wet-drawn steel wires with the diameter of 0.33mm as a middle layer monofilament, twisting one core wire and 4 middle layer monofilaments into a 1 multiplied by 0.185+4 multiplied by 0.33 central strand by a core machine of a double twisting machine (shown in figure 2), selecting nine wet-drawn steel wires with the diameter of 0.38mm as an outer layer monofilament, and twisting the central strand and nine outer layer monofilaments into a 1 multiplied by 0.185+4 multiplied by 0.33+9 multiplied by 0.38 structural steel wire (shown in figure 1) by the double twisting machine.
The steel cord adopts the raw material of a steel wire rod, and the steel wire rod used by the core wire 11 steel wire comprises the following components in percentage by weight: 0.60-0.85% of C, 0.30-0.60% of Mn, 0.15-0.30% of Si, no more than 0.030% of P, no more than 0.030% of S, and Fe as the other component. The steel wire rods used for the middle layer 22 and the outer layer 33 are composed of the following components in percentage by weight: 0.70-1.02% of C, 0.30-0.70% of Mn, 0.15-0.30% of Si, no more than 0.030% of P, no more than 0.030% of S, no more than 0.35% of Cr, and Fe as the other component.
Table 1 shows the dimensional parameters of the steel cord and the width of the slit obtained in examples 1 to 4.
TABLE 1 dimensional parameters of the steel cords of examples 1 to 4
As can be seen from table 1, in the embodiment, all gaps L between the outer layer filaments 33 and all gaps L1 between the intermediate layer filaments 22 of the steel cord are not less than 0.030mm on average, and are not less than 0.026mm on average, which can meet the requirement for gaps in the glue permeation process, so that the rubber can well permeate into the gaps of the intermediate layer L1 of the steel cord.
The cord thread preparation is carried out according to the method of the invention, the performance of the steel cord thread manufactured in the embodiment 1-4 is selected for testing, and the specific method for coating rubber in the rubber penetration test comprises the following steps: cutting a section of steel cord and placing the steel cord in a mold box with rubber, then covering rubber on the other side of the placed steel cord, forming a steel cord sample solidified in the rubber after a certain period of high temperature and high pressure, cutting a sample of 25mm, stripping the monofilament of an outer layer filament 33, measuring the approximate length J and the width K of the non-rubber-coated part of the sheath steel wire, wherein subscripts 1 and 2 … M represent different non-rubber-coated parts, calculating the area of the non-rubber-coated steel wire, dividing the total area of all steel wires obtained by multiplying the approximate width of the non-rubber-coated part by 25mm to obtain the percentage of the non-rubber-coated part, and subtracting the percentage by 1 to obtain the percentage of rubber coating, namely the rubber coating ratio Pc. See formula (1):
the results of the tests are shown in table 2:
TABLE 2 test data of steel cords of examples 1 to 4 of the present invention
Rubber penetration test in table 2-the lower the pressure drop, the better the bleed performance; the pressure drop is 0 percent, and the specific method for rubber permeation pressure drop is disclosed in Chinese patent application publication CN 102666972A.
As can be seen from the data detected in table 2, a gap exists between each monofilament of the middle layer filament 22 and the outer layer filament 33 of the steel cord prepared in example 2, so that rubber can fully penetrate and be embedded around each monofilament through the gap between the monofilaments during vulcanization, the rubber coating rate reaches 100%, rubber viscous fluid penetrates and effectively improves the adhesive force between the steel cord and the rubber, and the rubber viscous fluid penetrates and penetrates into the pores between each monofilament of the steel cord due to the structure, so that the rubber is coated around each monofilament, the compactness of the structure is formed, the intrusion of water and gas can be avoided, the corrosion resistance, fatigue resistance, impact resistance and adhesion retention of the steel cord in the tire are improved, and the service life of the tire is effectively prolonged.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A steel cord with a rubber-impregnated structure is characterized in that: the steel cord comprises a single filament with the diameter d0 of a core filament and n layers of filaments twisted around the core filament in the same twist direction and different twist pitches; the layer silk includes intermediate layer silk and outer layer silk, and the intermediate layer silk includes that 4 diameters are the monofilament of d1, and outer layer silk includes that 9 diameters are the monofilament of d2, and wherein the diameter of core silk, intermediate layer monofilament and outer layer monofilament satisfies following relation: d0 < d1 < d 2; gaps L are reserved among the outer layer filament monofilaments, and gaps L1 are reserved among the middle layer filament monofilaments to form a glue permeation structure.
2. A steel cord with a bleed structure according to claim 1, characterized in that said d0, d1 and d2 satisfy the following relations:
0.42＜(d0/d1)＜0.80；
1.00＜(d2/d1)＜1.20；
d0 is between 0.08 and 0.22 mm.
3. A steel cord with a bleed structure according to claim 2, characterized in that said d0, d1 and d2 satisfy the following relations:
0.50＜(d0/d1)＜0.640；
1.05＜(d2/d1)＜1.18；
d0 is between 0.095-0.20 mm.
4. A steel cord with a rubberized structure according to claim 1, wherein said outer layer filaments have an average width of gaps L between filaments L not less than 0.028mm, and said intermediate layer filaments have an average width of gaps L1 not less than 0.025 mm.
5. A method of manufacturing a steel cord with a rubberized structure according to any one of claims 1 to 4, comprising:
preparing three wet-drawn steel wires with the diameters of d0, d1 and d2 respectively;
selecting a wet-drawn steel wire with the diameter of d0 as a core wire, selecting 4 wet-drawn steel wires with the diameter of d1 as intermediate layer monofilaments, and twisting the core wire and the 4 intermediate layer monofilaments into a '1 + 4' central strand;
selecting 9 wet-drawn steel wires with the diameter d2 as outer layer monofilaments, twisting the central strand and the 9 outer layer monofilaments into a steel wire with a structure of '1 +4+ 9', and obtaining the steel cord with the rubber-infiltrated structure.
6. The method according to claim 5, characterized in that the method of preparing three wet drawn steel wires with diameters d0, d1 and d2, respectively, is:
performing surface treatment on the wire rod, performing rough drawing, then performing intermediate drawing to obtain a dry-drawn steel wire, and performing heat treatment to remove work hardening before intermediate drawing;
sequentially carrying out austenitizing treatment and water bath quenching treatment on the dry-drawn steel wire, and then electroplating thermal diffusion to obtain the steel wire with the surface plated with the copper-zinc alloy;
and (3) carrying out wet drawing on the steel wire plated with the copper-zinc alloy to obtain three kinds of wet-drawn steel wires with the diameters of d0, d1 and d2 respectively.
7. The method as claimed in claim 6, wherein the wire rod has a diameter of 5.5mm, is subjected to heat treatment to remove work hardening after being roughly drawn to a diameter of 2.80-3.14mm, and then is subjected to intermediate drawing to a dry drawn wire having a diameter of 0.82-2.20 mm.
8. The method of claim 6, wherein the wire rod comprises the following components in percentage by weight: 0.60-1.02% of C, 0.30-0.70% of Mn, 0.15-0.30% of Si, no more than 0.030% of P, no more than 0.030% of S, no more than 0.35% of Cr, and Fe as the other component.
9. Method according to claim 5, characterized in that the twisting is carried out by means of a double twisting machine.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110434260.XA CN113123149A (en) | 2021-04-22 | 2021-04-22 | Steel cord with glue permeation structure and preparation method thereof |
| PCT/CN2021/109549 WO2022222301A1 (en) | 2021-04-22 | 2021-07-30 | Steel cord having glue permeation structure and preparation method for steel cord |
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| CN202110434260.XA CN113123149A (en) | 2021-04-22 | 2021-04-22 | Steel cord with glue permeation structure and preparation method thereof |
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| CN113123149A true CN113123149A (en) | 2021-07-16 |
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| CN202110434260.XA Pending CN113123149A (en) | 2021-04-22 | 2021-04-22 | Steel cord with glue permeation structure and preparation method thereof |
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| WO (1) | WO2022222301A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022222301A1 (en) * | 2021-04-22 | 2022-10-27 | 江苏兴达钢帘线股份有限公司 | Steel cord having glue permeation structure and preparation method for steel cord |
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| Publication number | Publication date |
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| WO2022222301A1 (en) | 2022-10-27 |
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Application publication date: 20210716 |