Process for producing tire bead wire by using 80 # steel wire rod

Abstract

The invention discloses a process for producing a tire bead wire by using a 80 # steel wire rod, the 80 # steel wire rod is used as a raw material, and the wire rod comprises the following components in percentage by mass: 0.80-0.82% of C, 0.17-0.20% of Si, 0.45-0.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.03% of Cr, less than or equal to 0.03% of Ni, less than or equal to 0.04% of Cu and the balance of Fe and inevitable impurities. Compared with the prior art, in the production of the tire bead steel wire, the 80 # steel wire rod is used as a raw material, the cost is reduced on the premise of meeting customer requirements, the 80 # steel wire rod is lower in cost compared with a tire bead grade special wire rod (C82DA), the content of manganese and silicon elements is increased, and the heat treatment performance of the tire bead steel wire is remarkably improved; the drawing pass changes along with the specification of a product, the temperature in a plating solution in the chemical plating procedure, the concentration of Cu < 2 + > / Sn < 2 + >, the take-up speed, the tempering temperature and other procedures are adaptively adjusted, the drawing resistance is reduced, the diffusion efficiency of a plating layer is improved, meanwhile, the hot brittleness of the steel wire is eliminated, the toughness and strength of the steel wire are improved, and the energy consumption is reduced under the optimal production condition.

Description

Technical Field

[0001] The present invention relates to the technical field of bead wire production, in particular to a process for producing bead wire from 80# steel wire rod. Background Art

[0002] Bead wire is typically made of high-quality steel with a special coating. It securely and tightly secures the tire to the rim, ensuring it can withstand the immense pressures of driving. It also exhibits high rigidity, fatigue resistance, and corrosion resistance. Through technological innovation within the industry, bead wire has continuously achieved breakthroughs in strength, toughness, and plasticity, becoming an indispensable component of tires for automobiles, aviation, heavy machinery, and other equipment.

[0003] Currently, bead wires used in industrial applications come in two types: normal-strength (NT) and high-strength (HT). High-strength bead wire has a wider range of applications and higher market value. To improve the strength of bead wire, wire rods with higher carbon contents are typically used. However, this method easily destroys the wire's plasticity, resulting in poor wire forming and difficulty meeting the design requirements for various tire manufacturing applications. Furthermore, the production process for high-carbon-content wire rods for bead wire is complex, requiring higher resource consumption and increasing waste emissions. Summary of the Invention

[0004] The present invention aims to provide a process for producing bead wire from 80# steel wire rod. By replacing the commonly used C82DA bead-grade wire rod with 80# steel wire rod, the resulting bead wire possesses a high-strength (HT) structure, meeting tire manufacturing performance requirements while reducing wire rod raw material costs. Furthermore, by improving the tempering process, the toughness and plasticity of the wire are enhanced, further expanding the application range of the bead wire product. This invention substantially reduces the wire rod grade, simplifies the wire rod raw material production process, and reduces production costs. It also increases the manganese and silicon alloying element content, enhancing the hot working properties of the bead wire. Furthermore, the present invention improves the performance of the bead wire product by improving key processes such as drawing, electroless plating, and tempering. By adapting the take-up speed, heating temperature, and cooling water temperature during the tempering process, the present invention eliminates internal stress in the wire and improves its toughness and strength. Ultimately, this achieves the goals of energy conservation, emission reduction, and low-carbon development in the bead wire industry, thereby resolving the issues raised in the aforementioned background art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A process for producing bead wire from 80# steel wire rod uses the 80# steel wire rod as a raw material. The composition of the wire rod, measured by mass percentage, includes: C: 0.80% to 0.82%, Si: 0.17% to 0.20%, Mn: 0.45% to 0.50%, P: ≤0.015%, S: ≤0.015%, Cr: ≤0.03%, Ni: ≤0.03%, Cu: ≤0.04%, and the balance is Fe and unavoidable impurities.

[0006] The specific steps include: Step 1: subject the Φ5.5mm wire rod to processes such as dephosphorization, surface cleaning, boron coating, and drawing. The drawing process requires 3 to 5 passes through the die to obtain a large drawn steel wire semi-finished product.

[0007] Step 2: After welding and polishing the large-drawn steel wire obtained above, a multi-pass multi-servo direct-drive wire drawing machine is used to draw the wire through a die for 5 to 7 passes to obtain a medium-drawn steel wire semi-finished product.

[0008] Step 3: Degrease, pickle, and alkaline wash the intermediate drawn steel wire to remove surface impurities, and temper the steel wire with variable frequency induction current to eliminate internal stress.

[0009] Step 4: After cooling and cleaning, immerse the steel wire in the copper plating solution. After the redox reaction, the Cu in the solution 2+ 、Sn 2+ The surface Fe is oxidized and diffused to form a bronze alloy layer; after rinsing and drying, the steel wire is passed through a cotton thread soaked in Kumar solution and coated with Kumar resin.

[0010] Step 5: The finished bead wire is taken up through an I-shaped wheel and tested for breaking strength, yield strength ratio, and torsional performance.

[0011] Step 6: Classify and package qualified products according to different varieties and specifications for storage.

[0012] A further solution of the present invention is that in step 3, the take-up speed is controlled to be 200-400 m / min, and the tempering heating temperature is controlled to be 400-500°C.

[0013] A further solution of the present invention is that in step 4, the plating solution temperature is controlled at 35±5°C, and the Cu 2+ 、Sn 2+ The concentrations are 3.0-9.0 g / l and 0.1-0.3 g / l respectively.

[0014] A further embodiment of the present invention is that in step 4, the copper content in the coating is 98.35±1.35%, and the tin content is 1.65±1.35%.

[0015] Beneficial effects of the present invention: The process for producing tire bead wire from 80# steel wire rod of the present invention has lower carbon content and application grade than tire bead-specific wire rod, which reduces the difficulty of producing wire rod raw materials and saves costs; increases the content of manganese and silicon elements, and improves the hardenability of the steel wire; manganese and sulfur in the steel form MnS with a higher melting point, which avoids the formation of FeS films on grain boundaries, eliminates cracks on the surface of the steel wire, improves hot working performance, and thus improves the strength and toughness of the material.

[0016] The present invention's process for producing bead wire from 80# steel wire rod achieves tempering conditions with minimal energy consumption by adaptively adjusting the wire take-up speed and tempering temperature. This significantly reduces resistance during bead wire drawing, lowering energy consumption and facilitating efficient production. While lowering production costs and enhancing physical properties (breaking strength, yield strength ratio, and torsion strength), it also reduces energy consumption and waste emissions, meeting environmentally friendly requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a comparison chart of the breaking force of the tire bead wire products obtained according to Examples 1, 2, and 3 of the present invention and the original process.

[0018] Figure 2 The figure is a comparison chart of the yield strength ratio of the bead wire products obtained according to Examples 1, 2, and 3 of the present invention and the original process.

[0019] Figure 3 The figure is a comparison chart of the torsion value of the tire bead wire product obtained according to Examples 1, 2, and 3 of the present invention and the original process. DETAILED DESCRIPTION

[0020] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. Example 1

[0021] (1) Φ5.5mm 80# steel wire rod is used as raw material. The composition of the wire rod is calculated by mass percentage, including: C: 0.80%, Si: 0.17%, Mn: 0.45%, P: 0.013%, S: 0.008%, Cr: 0.02%, Ni: 0.01%, Cu: 0.002%, and the balance is Fe and unavoidable impurities.

[0022] (2) The above-mentioned wire rod is passed through a descaling machine to remove the surface oxide scale, and then the surface is cleaned, boron coated, drawn, and wound in sequence. The drawing process requires four passes through the die to obtain a Φ3.13mm steel wire.

[0023] (3) After the large-scale semi-finished products are welded and polished, they are drawn through 7 passes of die using a multi-pass multi-servo direct-drive wire drawing machine to obtain a Φ1.55mm medium-drawn steel wire.

[0024] (4) Degrease, pickle, and alkaline wash the intermediate drawn steel wire to remove surface impurities. Temper the wire using variable frequency induction current to eliminate internal stress. The take-up speed is controlled at 230 m / min, and the tempering temperature is controlled at 420°C.

[0025] (5) After cleaning, immerse the steel wire in the copper plating solution. After the redox reaction, the Cu in the solution 2+ 、Sn 2+ Oxidize the surface Fe, the bath temperature is 35℃, and the Cu content in the bath is 2+ 、Sn 2+ The concentrations were 8.5 g / l and 0.3 g / l respectively, and a bronze alloy layer was diffused. After rinsing and drying, the steel wire was passed through a cotton thread soaked in Kumar solution to coat the Kumar resin.

[0026] (6) The tire bead wire product obtained is taken up by a Z54 I-shaped wheel and tested for breaking strength, yield strength ratio, total elongation at break and torsional performance.

[0027] (7) Products that have passed the inspection shall be packaged and stored according to different varieties and specifications.

[0028] The 1.55mm HT bead wire produced in this example has a copper coating content of 98.02% and a tin content of 1.98%. Its breaking strength is 4275N, a 4.73% increase compared to the original process. Its yield strength ratio is 95.2%, a 6.61% increase. Its torsion resistance is 36 times / 360°, a 56.52% increase compared to the original process. Example 2

[0029] (1) Φ5.5mm 80# steel wire rod is used as raw material. The composition of the wire rod is calculated by mass percentage, including: C: 0.80%, Si: 0.19%, Mn: 0.47%, P: 0.015%, S: 0.014%, Cr: 0.01%, Ni: ≤0.03%, Cu: ≤0.004%, and the balance is Fe and unavoidable impurities.

[0030] (2) The above-mentioned wire rod is passed through a descaling machine to remove the surface oxide scale, and then the surface is cleaned, boron coated, drawn, and wound in sequence. The drawing process requires 5 passes through the die to obtain Φ3.25mm steel wire.

[0031] (3) After the large-drawn semi-finished product is welded and polished, it is drawn through 6 passes of a die using a multi-pass multi-servo direct-drive wire drawing machine to obtain a Φ2.00mm medium-drawn steel wire.

[0032] (4) Degrease, pickle, and alkaline wash the intermediate drawn steel wire to remove surface impurities. Temper the wire using variable frequency induction current to eliminate internal stress. The take-up speed is controlled at 350 m / min, and the tempering temperature is controlled at 470°C.

[0033] (5) After cooling and cleaning, immerse the steel wire in the copper plating solution. After the redox reaction, the Cu in the solution 2+ 、Sn 2 + The surface Fe is oxidized, the bath temperature is 40℃, and the Cu 2+ 、Sn 2+ The concentrations were 5.5 g / l and 0.2 g / l, respectively, and a bronze alloy layer was diffused. After rinsing and drying, the steel wire was passed through a cotton thread soaked in Kumar solution to coat the Kumar resin.

[0034] (6) The tire bead wire product obtained is taken up by a Z54 I-shaped wheel and tested for breaking strength, yield strength ratio, total elongation at break and torsional performance.

[0035] (7) Products that have passed the inspection shall be packaged and stored according to different varieties and specifications.

[0036] The 2.00mm HT bead wire produced in this example has a copper content of 98.41% and a tin content of 1.59%. Its breaking strength is 6285N, a 4.40% increase compared to the original process. Its yield strength is 94.5%, a 7.88% increase. Its torsion resistance is 29 times / 360°, a 45.00% increase compared to the original process. Example 3

[0037] (1) Φ5.5mm 80# steel wire rod is used as raw material. The composition of the wire rod is calculated by mass percentage, including: C: 0.80%, Si: 0.20%, Mn: 0.48%, P: 0.015%, S: 0.014%, Cr: 0.01%, Ni: ≤0.03%, Cu: ≤0.004%, and the balance is Fe and unavoidable impurities.

[0038] (2) The above-mentioned wire rod is passed through a descaling machine to remove the surface oxide scale, and then the surface is cleaned, boron coated, drawn, and wound in sequence. The drawing process requires 5 passes through the die to obtain Φ3.25mm steel wire.

[0039] (3) After the large-drawn semi-finished product is welded and polished, it is drawn through a 5-pass die using a multi-pass multi-servo direct-drive wire drawing machine to obtain a Φ2.20mm medium-drawn steel wire.

[0040] (4) Degrease, pickle, and alkaline wash the intermediate drawn steel wire to remove surface impurities. Temper the wire using variable frequency induction current to eliminate internal stress. The take-up speed is controlled at 330 m / min, and the tempering temperature is controlled at 480°C.

[0041] (5) After cleaning, immerse the steel wire in the copper plating solution. After the redox reaction, the Cu in the solution 2+ 、Sn 2+ Oxidize the surface Fe, the bath temperature is 30℃, and the Cu 2+ 、Sn 2+ The concentrations were 6.0 g / l and 0.2 g / l, respectively, and a bronze alloy layer was diffused. After rinsing and drying, the steel wire was passed through a cotton thread soaked in Kumar solution to coat the Kumar resin.

[0042] (6) The tire bead wire product obtained is taken up by a Z54 I-shaped wheel and tested for breaking strength, yield strength ratio, total elongation at break and torsional performance.

[0043] (7) Products that have passed the inspection shall be packaged and stored according to different varieties and specifications.

[0044] The 2.20mm HT bead wire produced in this example has a copper coating content of 97.62% and a tin content of 2.38%. Its breaking strength is 7363N, a 2.46% increase compared to the original process. Its yield strength ratio is 95.3%, a 7.56% increase. Its torsion resistance is 28 times / 360°, a 47.37% increase compared to the original process.

[0045] Combining the above three high-strength structural bead wire embodiments of 1.55mmHT, 2.00mmHT and 2.20mmHT, it can be seen that the method of the present invention, while meeting customer needs, not only reduces product production costs by using lower-grade 80# steel discs, but also improves key physical properties of the steel wire such as breaking force, yield strength ratio and torsion value, as follows Figure 1 、 2 As shown in Figure 3, the hardness and toughness of the tire bead wire are enhanced, further broadening the application range of the product.

[0046] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A process for producing bead wire from 80# steel wire rod, characterized by: 80# steel wire rod is used as raw material. The composition of the wire rod is calculated by mass percentage, including: C: 0.80% to 0.82%, Si: 0.17% to 0.20%, Mn: 0.45% to 0.50%, P: ≤0.015%, S: ≤0.015%, Cr: ≤0.03%, Ni: ≤0.03%, Cu: ≤0.04%, and the balance is Fe and unavoidable impurities; The specific steps include: Step 1: subjecting the Φ5.5mm wire rod to processes such as dephosphorization, surface cleaning, boron coating, and drawing, wherein the drawing process requires 3 to 5 passes through the die to obtain a semi-finished large drawn steel wire; Step 2: After welding and polishing the large-drawn steel wire obtained above, a multi-pass multi-servo direct-drive wire drawing machine is used to draw the wire through a die through 5 to 7 passes to obtain a medium-drawn steel wire semi-finished product; Step 3: Degreasing, pickling, alkali washing and other means are used to remove surface impurities from the intermediate drawn steel wire, and the steel wire is tempered and heated by variable frequency induction current to eliminate internal stress; Step 4: After cooling and cleaning, immerse the steel wire in the copper plating solution. After the redox reaction, the Cu in the solution 2+ 、Sn 2+ The surface Fe is oxidized and diffused to form a bronze alloy layer; after rinsing and drying, the steel wire is passed through a cotton thread soaked in Kumar solution to be coated with Kumar resin; Step 5: The finished bead wire is taken up through an I-shaped wheel and tested for breaking strength, yield strength ratio, and torsional performance; Step 6: Classify and package qualified products according to different varieties and specifications for storage.

2. The process for producing bead wire from 80# steel wire rod as claimed in claim 1, characterized in that: In step 3, the take-up speed is controlled to be 200-400 m / min, and the tempering heating temperature is controlled to be 400-500°C.

3. The process for producing bead wire from 80# steel wire rod according to claim 1, characterized in that: In step 4, the plating solution temperature is controlled at 35±5°C, and the Cu 2+ 、Sn 2+ The concentrations are 3.0-9.0 g / l and 0.1-0.3 g / l respectively.

4. The process for producing bead wire from 80# steel wire rod according to claim 1, characterized in that: In step 4, the copper content in the coating is 98.35±1.35%, and the tin content is 1.65±1.35%.

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