CN210553963U

CN210553963U - Intermediate frequency tempering device for tempering tire bead steel wire

Info

Publication number: CN210553963U
Application number: CN201821847372.8U
Authority: CN
Inventors: 苗为钢; 朱银桂; 柯增光
Original assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Current assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Priority date: 2018-11-10
Filing date: 2018-11-10
Publication date: 2020-05-19
Anticipated expiration: 2028-11-10

Abstract

The utility model discloses an intermediate frequency tempering device for tempering tire bead steel wire, tire bead steel wire are once for drawing or draw the single steel wire that forms twice, and the steel wire carries out intermediate frequency tempering process adjustment after the surperficial edulcoration, finally obtains the steel wire performance of ideal. The utility model discloses a tempering process adjustment makes tempering back steel wire breaking force promote 0 ~ 15% than generating line steel wire breaking force, and elongation at break keeps more than 5% simultaneously, satisfies tire bead steel wire elongation at break requirement, and other performance index do not have obvious change. Furthermore, through the utility model discloses the intensity of the tire bead steel wire of tempering is promoted to the tire bead steel wire under the requirement of equal intensity level can reduce suitably to reduce bus-bar steel wire carbon content or suitably reduce bus-bar steel wire inlet wire diameter production, finally reaches the purpose of practicing thrift tire bead steel wire manufacturing cost.

Description

Intermediate frequency tempering device for tempering tire bead steel wire

Technical Field

The utility model relates to a tire bead steel wire especially relates to an intermediate frequency tempering device for tempering tire bead steel wire.

Background

The bead wire is an important stressed component of the radial tire, and extremely complex alternating load and impact load are born in the tire, so that the requirement on the performance of the bead wire is high. The bead wire is required to have not only higher strength and good fatigue resistance but also impact resistance, and thus the bead wire is required to have the characteristics of high elongation, high torsion data and the like. The bead wire plays an important role in safety, high-speed performance, and durability of the tire, and the bead wire periodically receives deformation stress such as tension, bending, shearing, and the like. The tire bead steel wire for the tire can be helpful to improve the quality of the tire only if the tire bead steel wire has higher strength and better strip stretching rate, torsion and bending performance, and further improves the safety performance of the tire.

With the development of radial tires, the conventional production process of the bead wire mainly comprises tempering and plating the bead wire, wherein the bead wire is obtained by performing a series of surface treatments on a wire rod with the diameter of 5.5mm-6.5mm and then drawing the wire rod once or twice, the bead wire is tempered and plated with copper after the surface treatments, and then the finished bead wire is obtained. The main processes involved in the one-step drawing are as follows: paying off wires → continuous drawing of pretreatment → copper plating by tempering → packaging of finished products, wherein the diameter of the continuous drawing steel wire of the pretreatment is generally 1.20mm-2.30 mm; the two-time drawing relates to the main processes as follows: the method comprises the steps of wire paying-off → pretreatment drawing → intermediate heat treatment → medium wire drawing → tempering copper plating → finished product packaging, wherein the diameter of a pretreatment drawn steel wire is generally 2.50mm-5.00mm, and the diameter of a medium wire drawing wire is generally 0.70mm-1.60 mm.

Under competitive pressure, cost reduction and efficiency improvement are also necessary measures for tire enterprises to seek development in the market, and the saving and use of limited resources are promoted by the manufacturing industry. Therefore, the tire bead steel wire used as the tire framework material continuously receives the challenges of performance, cost and energy conservation, and in addition, energy conservation and emission reduction are more and more emphasized all over the world, the development of high-performance low-energy-consumption tires is faster and faster, and the requirements of the tires on steel wire cords are higher and higher. However, the existing tempering process of the bead wire has the following defects: the first disadvantage is that: the tempering process of the tire bead steel wire has certain influence on the breaking force of the steel wire, the strength of the steel wire is reduced after tempering, and the production cost of the tire bead steel wire is increased; the second disadvantage is that: the reduction of the breaking force of the tire bead steel wire inevitably requires the increase of the diameter of the steel wire to make up the deficiency of the reduction of the breaking force, thereby leading the usage amount of the tire bead steel wire in unit length to be increased, leading the weight of a single tire to be increased, leading the cost of the tire to be increased, and being not beneficial to the light weight requirement of the tire. In view of the above problems, there is a need for a tempering apparatus for bead wires, which can improve the breaking force of the bead wires and ensure the elongation of the bead wires while ensuring the same carbon content and the same diameter of the steel wire bus.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a method for controlling the breaking force and the elongation of a tire bead steel wire.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an intermediate frequency tempering device for tempering a tire bead steel wire, wherein a tire bead steel wire bus is a single steel wire formed by one-time drawing or two-time drawing, and the intermediate frequency tempering device comprises a shell, an intermediate frequency tube, a power control device and a power supply; the number of the intermediate frequency tubes is at least 2, the intermediate frequency tubes are arranged and fixed in the shell, the intermediate frequency tubes are connected with the power control device and the power supply through wires, and the wires are wound on the intermediate frequency tubes in a spiral shape; the power of the intermediate frequency tempering device is 5KW-35 KW; and the tire bead steel wire passes through the intermediate frequency tempering device and is tempered by heating.

Preferably, only one of said bead wire busbars is heated in each intermediate frequency tube.

Preferably, the intermediate frequency tempering device comprises 1-40 intermediate frequency tubes, namely 1-40 bead wire bus bars are positioned in the intermediate frequency tubes at the same time.

Preferably, the plurality of busbar wires processed by the tempering device at the same time have the same or different diameters.

Preferably, the optimal power of the intermediate frequency tempering device is 20 KW.

Preferably, the bead wire has a diameter of 0.70mm to 2.30 mm.

Compared with the prior art, the beneficial effects of the utility model are that:

the tempering process is adjusted to improve the breaking force of the tempered steel wire by 0-15% compared with that of the bus steel wire, and simultaneously, the elongation at break is kept above 5%, so that the requirement on the elongation at break of the tire bead steel wire is met, and other performance indexes are not obviously changed. In addition, the strength of the bead wire can be improved, so that the bead wire under the requirement of the same strength level can reduce the carbon content of the bus wire properly or reduce the incoming diameter of the bus wire properly for production, and finally the purpose of saving the production cost of the bead wire is achieved. The utility model discloses can improve the bearing capacity and the security performance of tire, can have the relative quantity of reduction tire bead steel wire under the new technological condition, reduce tire manufacturing cost, satisfy the light quantification requirement of tire.

Drawings

FIG. 1 is a schematic diagram of intermediate frequency tempering of a single bus steel wire after impurity removal;

FIG. 2 is a schematic diagram of the integral intermediate frequency tempering of a plurality of steel wires after impurity removal.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

Referring to fig. 1 and 2, an intermediate frequency tempering device for tempering a bead wire, wherein a bead wire bus is a single wire formed by one-time drawing or two-time drawing, and the bead wire is a wire with ideal performance obtained by performing intermediate frequency tempering process adjustment after surface impurity removal; the intermediate frequency tempering process is realized by an intermediate frequency tempering device.

The intermediate frequency tempering device comprises a shell, an intermediate frequency tube 2, a power control device 3 and a power supply 4; the number of the intermediate frequency tubes is at least 2, the intermediate frequency tubes 2 are arranged and fixed in the shell, the intermediate frequency tubes 2, the power control device 3 and the power supply 4 are connected together through a lead, and the lead is spirally wound on the intermediate frequency tubes 2; the power of the intermediate frequency tempering device is 5KW-35 KW.

The intermediate frequency tempering process comprises the following steps: feeding the bead wire bus 1 obtained after primary drawing or secondary drawing into the intermediate frequency tempering device for tempering, wherein the power of the intermediate frequency tempering device is 5KW-35KW, the power range is further narrowed and defined on the basis of the original tempering process, and when the power is less than 5KW, the breaking force of the tempered finished bead wire is insufficient and cannot meet the production requirement; when the power is more than 35KW, the elongation of the finished product of the bead wire after tempering is continuously increased, and the breaking force is continuously reduced so that the comprehensive performance of the finished product of the bead wire is reduced. The use of power control rather than temperature control makes it easier to operate the production equipment.

In the figure 1, a single bead wire bus 1 subjected to surface impurity removal is sent into the intermediate frequency tube 2 at a certain speed and is tempered through the intermediate frequency tube 2, the power control device 3 connected with the intermediate frequency tube 2 can control the tempering power, so that the tempering temperature in the intermediate frequency tube 2 is changed, the bead wire bus 1 improves the wire breaking force and the elongation rate under the condition that the carbon content is not changed, namely, the bead wire under the requirement of the same strength level can properly reduce the carbon content of the bead wire bus 1 or properly reduce the incoming wire diameter production of the bead wire bus 1, and finally the purpose of saving the bead wire production cost is achieved.

Further, the intermediate-frequency tempering process is to perform intermediate-frequency primary heating on the single bus steel wire, namely, one bus steel wire is heated in one intermediate-frequency tube and is heated and tempered separately, each bead steel wire bus 1 obtains the best tempering effect, and the condition of uneven tempering cannot occur.

In one embodiment, the tempering process simultaneously treats 1-40 bus steel wires at one time, i.e. the number of the intermediate frequency tubes ranges from 1-40. Preferably, the diameters of the plurality of busbar wires treated simultaneously by the tempering process are the same or different. This allows to achieve a quantitative production requirement, which is advantageous for reducing time costs and economic costs.

In a preferred embodiment, the optimum power of the intermediate frequency tempering device is 20 KW. Taking a conventional phi 1.55HT bead wire bus as an example, the conventional phi 1.55HT bead wire bus is formed by taking a wire rod with the diameter of phi 5.50 and the carbon content of 0.8 wt% as a raw material through one-time drawing, and the main processes of the conventional phi 1.55HT bead wire bus comprise mechanical peeling of the wire rod, mechanical rust removal, surface cleaning, surface boron coating, drying, drawing and the like.

After the phi 1.55HT tire bead steel wire bus is subjected to surface impurity removal treatment, the relative adjustment process of the adjustment of the intermediate frequency tempering process is carried out, and the data comparison of the steel wire destructive power and the elongation rate is as follows:

in the upper table, the bus steel wire is used when the medium-frequency power is 0KW, and the wire moving speeds of the tempered wire steel in the upper table are the same.

From the comparison of the data in the table, the breaking force of the tempered steel wire is reduced to a different degree than that of the bus steel wire under the condition that the medium-frequency power is 23KW and 26KW, and the breaking of the steel wire is in a descending trend along with the reduction of the medium-frequency power; the breaking force of the steel wire is reduced after the tempering in the conventional process, and the phenomenon that the breaking force of the steel wire is unqualified can be solved by adjusting the medium frequency power, so that the production requirement is met.

The medium-frequency power of 20KW is seen from the upper surface of the tempering process, the breaking force and the elongation at break of the steel wire have certain margin space compared with the standard, the production requirement can be met, and the steel wire is not greatly twisted with the bus steel wire after tempering, so that the standard requirement can be met. If the breaking force of the steel wire is unqualified when the conventional tempering process is adopted, the steel wire can not meet the standard requirement. Under the condition, the carbon content of the steel wire is inevitably increased to improve the breaking force of the bus steel wire, namely, the carbon content of a raw material wire rod is increased to 82 wt% through a test, the breaking force of the steel wire can reach 4050N under the conditions of medium-frequency power 23KW and the same wiring speed, although various performances of the steel wire meet standard requirements after the carbon content is increased, the cost of steel materials is increased due to the increase of the carbon content, and the manufacturing cost of the tire bead steel wire is increased.

Preferably, the carbon content of the bead wire is 0.60 wt% to 0.95 wt%, i.e. the weight percentage of the bead wire is 0.60 wt% to 0.95%, the carbon content of the improved bead wire bus bar is reduced compared to conventional bead wire bus bars. Still further, the bead wire generating line has a diameter of 0.70mm to 2.30 mm. Compared with the tire bead wire bus bar with the same strength, the diameter of the improved tire bead wire bus bar is reduced. By reducing the carbon content or the diameter of the bus steel wire, the relative usage amount of the bead steel wire can be reduced, the manufacturing cost of the tire is reduced, and the requirement of the tire on easy quantification is met.

Preferably, the routing speed of the bead wire is 150m/min-500m/min, and better wire performance can be obtained after the tempering process is finished.

From the above, the utility model discloses a tempering process adjustment makes tempering back steel wire breaking force promote 0-15% than generating line steel wire breaking force, and elongation at break keeps more than 5% simultaneously, and the adjustment improves the breaking force of the steel wire generating line of equal carbon content, same diameter, satisfies tire bead steel wire elongation at break requirement, and other performance index do not have obvious changes. In addition, the strength of the bead wire can be improved, so that the bead wire under the requirement of the same strength level can reduce the carbon content of the bus wire properly or reduce the incoming diameter of the bus wire properly for production, and finally the purpose of saving the production cost of the bead wire is achieved. The utility model discloses can improve the bearing capacity and the security performance of tire, can have the relative quantity of reduction tire bead steel wire under the new technological condition, reduce tire manufacturing cost, satisfy the light quantification requirement of tire.

The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.

Claims

1. An intermediate frequency tempering device for tempering a tire bead steel wire, wherein a tire bead steel wire bus is a single steel wire formed by one-time drawing or two-time drawing, and is characterized by comprising a shell, an intermediate frequency tube, a power control device and a power supply; the number of the intermediate frequency tubes is at least 2, the intermediate frequency tubes are arranged and fixed in the shell, the intermediate frequency tubes are connected with the power control device and the power supply through wires, and the wires are wound on the intermediate frequency tubes in a spiral shape; the power of the intermediate frequency tempering device is 5-35 KW, and the tire bead steel wire passes through the intermediate frequency tempering device and is heated and tempered.

2. An intermediate frequency tempering arrangement for tempering bead wires according to claim 1, wherein: only one of the bead wire bus bars is heated in each intermediate frequency tube.

3. An intermediate frequency tempering arrangement for tempering bead wires according to claim 1, wherein: the intermediate frequency tempering device comprises 1-40 intermediate frequency tubes, namely 1-40 bead wire buses are positioned in the intermediate frequency tubes at the same time.

4. An intermediate frequency tempering arrangement for tempering bead wires according to claim 3, wherein: the diameters of the plurality of bus steel wires processed by the intermediate frequency tempering device at the same time are the same or different.

5. An intermediate frequency tempering arrangement for tempering bead wires according to claim 1, wherein: the optimal power of the intermediate frequency tempering device is 20 KW.

6. An intermediate frequency tempering arrangement for tempering bead wires according to claim 1, wherein: the diameter of the bead wire is 0.70mm-2.30 mm.