RU2436675C1 - Method to manufacture case of pneumatic single-layer tyre - Google Patents

Abstract

FIELD: technological processes. ^ SUBSTANCE: invention relates to tyre industry and to a method to make a case of a pneumatic single-layer tyre. A toroidal stock of a frame is formed from tyre fabric, comprising warp and weft threads coated with a layer of adhesive composition. Reinforcement layers of a breaker are prepared and cut, assembling is done, which includes application of breaker and tread layers, cases are formed and vulcanised. The frame is made of non-rubber coated tyre fabric, a warp thread and a weft thread of which in areas of crossing are fixed to each other by means of a wrap thread and coated with an adhesive solution that provides stickiness to non-vulcanised rubber. During tyre assembly the frame tyre fabric is applied on an assembling drum directly onto a rubber part, or the frame tyre fabric is previously applied onto the rubber part and wound on the assembling drum jointly as a signal part. ^ EFFECT: invention provides for increased accuracy of frame threads positioning, increased quality of a finished tyre with reduction of technological operations number in process of the frame production, which reduces costs for production and simultaneously increases quality indices of the finished tyre, first of all, homogeneity. ^ 3 cl, 2 dwg, 1 tbl

Description

The invention relates to vehicles, in particular to methods for the manufacture of tires of automobile pneumatic tires with a single-layer carcass of textile cord.

A traditional method of manufacturing a tire carcass is known, in which the textile cord fabric is pre-rubberized (calendered), then it is cut across the fabric and again mated with a 90-degree rotation, mating is done by sticking unvulcanized rubber and rolls into rolls. Then, the material obtained on the assembly machine is wrapped (wound) on a cylindrical (at least in the central part) drum, on which the tire carcass blank is formed. (V.V. Ragulin, Tire technology, Moscow: Chemistry, 1970)

A known method of manufacturing a pneumatic tire, in which a toroidal blank of a reinforced carcass is made by spiral winding a thread or cord with the formation of at least one layer on an annular assembly core, pre-coated with at least a layer of rubber compound. The side rings of the tire are installed, then a toroidal blank of the carcass is cut along the circumference from the inside. The ends of the cut carcass are folded outward around the beads of the tire. Form on both sides of the cut two halves of the toroidal blank of the frame. Then carry out the final operations for the manufacture of tires. (RF patent No. 2129487, IPC B29D 30/06, B29D 30/08, publ. 04/27/1999)

A known method of manufacturing a tire, comprising the manufacture of a carcass, in which the formation of one layer of the carcass in the form of a strip, the latter includes many longitudinal and parallel filamentary elements, partially covered with a layer of elastomeric material, further applying the strip to a toroidal support to which a structure in the form of a tape is attached, a tread strip and a pair of side walls on the circumferential outer side of the frame. Carry out the vulcanization of the tire. A continuous element in the form of a strip is applied to the toroidal support by alternating applied sections, each of which is U-shaped around the cross-section contour of the toroidal support to form two lateral sections located in planes orthogonal to the geometric axis of rotation of the toroidal support and vertex sections. The lateral sections are located at a distance from each other in the axial direction. The apex sections are located radially from the outer side between the side sections and are sequentially applied side by side along the circumferential extension of the toroidal support. At that time, each side section of each applied section was partially overlapped by the side section of one subsequent applied section. (RF patent No. 2213008, IPC B29D 30/08, publ. 09/27/2003 - prototype.)

The disadvantages of the known methods is the need to perform a large number of preliminary operations for the preparation of the source material for the assembly of the frame (rubberizing, cutting, joining strips), which is associated with a significant share of labor and energy costs, as well as a large number of transport operations. In addition, the options for manufacturing the frame on the mandrel are longer than the traditional method.

A tire of a car tire is an elastic strong rubber-cord sheath made by sequential assembly of parts on an assembly drum, their processing and subsequent vulcanization in molds.

One of the main parts of the tire is the carcass - rubber-cord layers, usually containing textile (or m / a) threads, forming a toroidal power base of the tire.

The main fabric for the textile layers of the tire carcass is the weft cord. Weft cord - a fabric consisting of frequent strong longitudinal threads - warp and transverse, rarer threads - weft, designed to fix warp threads before rubberizing. In this case, the weft threads do not form nodes with warp threads. The warp threads of the cord must withstand heavy loads and have the necessary elasticity and strength with repeated cyclic (variable) deformations.

The technical problem to which the invention is directed is to increase the accuracy of the location of the carcass filaments, to improve the quality of the finished tire while reducing the number of technological operations in the process of manufacturing the carcass, which reduces production costs and at the same time improves the quality of the finished tire, primarily uniformity.

The stated technical problem is solved in that in a method for manufacturing a tire of a pneumatic single-layer tire, characterized by the formation of a toroidal blank of a carcass of cord fabric, including warp and weft, coated with a layer of adhesive composition, preparation and cutting of the reinforcing layers of the belt, assembly, including the application of layers of the belt and tread , molding and vulcanization of the tire, according to the proposed invention, the frame is made of non-rubber cord fabric, warp and weft threads of which in places the sections are fixed between each other with a wrapping thread and coated with an adhesive composition, which provides adhesion to unvulcanized rubber, when assembling a tire, the carcass cord fabric is applied directly to the rubber part or the carcass cord fabric on the assembly drum and pre-applied to the rubber part and wound together on the assembly drum as a single part.

The technical result achieved by the implementation of the entire claimed combination of essential features is:

- simplification of the manufacturing process of the frame due to the exclusion of rubberizing operations and preliminary cutting of rubber cord material;

- reducing rubber consumption;

- increasing the uniformity of the finished product,

- reducing tire weight by eliminating the preliminary rubberization of the textile layers of the carcass.

The proposed method is illustrated by drawings, where

figure 1 shows an example assembly according to the claimed method;

figure 2 shows the appearance of the toroidal blanks of the tire.

Figure 1-2 shows the following positions of the drawings:

1 - cord non-rubberized fabric frame,

2 - a rubber part, including a sealing layer with a rubber gasket or a rubber layer, a sealing layer and sidewalls,

3 - breaker;

4 - tread;

5 - sidewall;

6 - side ring.

The use of cord fabric 1 made of textile material for the frame, in which the warp and weft threads are fixed to each other with a special thin upholstery thread, provides a significantly better mutual fixation of the main (frame) cord threads to each other. Since the textile material is not only impregnated to improve bonding with rubber, but also coated with a special adhesive composition, which provides high adhesion to unvulcanized rubber, this allows not to rubberize the material beforehand and use it immediately in the process of tire assembly.

According to the proposed method, such cord fabric 1 is used directly on the assembly machine, laying it on a cylindrical (at least in the central part) frame drum or cord fabric 1 is preliminarily applied to the rubber part 2 in the feed device of the machine and wound them together on the assembly drum as a single part. Then they can impose other necessary rubber parts, if necessary, and also place side rings 6 with wings (Fig. 1).

The rubber part 2 is a combined part and includes a rubber layer and a sealing layer or a rubber layer, a sealing layer and sidewalls 5.

After that, make a belt-tread belt and form a toroidal blank of the tire (figure 2). In this case, the lining of the textile material of the cord fabric with rubber is carried out directly in the process of molding the tire on the assembly drum, and the flow of rubber between the threads and the formation of the rubber-cord bond occurs directly during vulcanization of the adjacent tire parts by rubber due to the pressure of the diaphragm in the mold and high temperature.

As an example of a specific implementation, we can give a method of manufacturing a pneumatic single-layer tire tire and calculate the parameters of such a tire for a 185 / 65R14 passenger car with one layer of 18PDU textile cord in the frame, two metal cord layers from 3l30 cord and one “protective” textile layer in belt 3 .

In the process of tire assembly, a textile cord fabric 1 made by knitting is used, the warp and weft threads of which are fixed at the intersections at the intersection with a twisting thread. The cord fabric 1 is pre-impregnated and coated with a composition that provides adhesion to rubber. First, a combined rubber part 2 consisting of a rubber layer, a sealing layer and a sidewall 5 is superimposed on the frame assembly drum, then cord fabric 1 corresponding to the width of the carcass is applied (Fig. 1). It is possible that the cord fabric is applied to the rubber composite part beforehand. In this case, the cord fabric of the frame and the combined rubber part are superimposed on the frame assembly drum at the same time. At the same time, a belt 3 is made of a rubberized and cut metal cord fabric (strip) on the belt drum and, if necessary, a shielding textile layer and tread 4 are applied. Then the transfer device, on which the side rings 6, duplicated with the wing are pre-fixed, moves the belt blank to the middle zone frame drum, simultaneously fix the side rings 6 due to the diaphragms of the frame drum. Then, the tire blank is formed by simultaneously turning the rubber part of the sidewall 5 and the carcass around the side ring 6 with the closer approach of the side rings and the formation of the central part by the diaphragm (figure 2). The finished tire blank is then vulcanized in the mold.

Table 1 shows the calculated data for passenger tires collected in a known manner using pre-rubberized textile carcass layers (Etalon) and the proposed method (Experimental) using non-rubberized carcass carcass fabric as cord fabric, warp and weft threads of which are fixed at intersections with a twisting thread and are covered with an adhesive composition, which provides adhesion to unvulcanized rubber.

Table 1 The name of indicators The standard with a rubberized textile layer of the frame Experienced with a non-rubberized textile layer of the frame Diameter,% one hundred one hundred Width,% one hundred one hundred The temperature at the edges of the breaker,% one hundred 80-90 Efficiency on machines,% one hundred one hundred Speed endurance,% one hundred 100-105 Weight, % one hundred 95 Cost% one hundred 90

Using the proposed method for manufacturing a tire of a pneumatic single-layer tire provides increased production efficiency by saving energy and labor resources and reducing depreciation due to the elimination of rubber cutting and cutting of cord material and reducing rubber consumption and, accordingly, reducing tire weight.

Claims (3)

1. A method of manufacturing a tire of a pneumatic single-layer tire, characterized by the formation of a toroidal blank of the carcass of the cord fabric, including warp and weft, coated with a layer of adhesive composition, preparation and cutting of reinforcing layers of the belt, assembly, including the application of layers of belt and tread, molding and vulcanization of the tire, characterized in that the frame is made of non-rubberized cord fabric, warp and weft threads of which are fixed at the intersections with a twisting thread and covered with glues m composition, providing adhesion to unvulcanized rubber. 2. A method of manufacturing a tire of a pneumatic single-layer tire according to claim 1, characterized in that the frame cord fabric is applied directly to the rubber part on the assembly drum. 3. A method of manufacturing a pneumatic single-layer tire tire according to claim 1, characterized in that the carcass cord fabric is preliminarily applied to the rubber part and wound together on the assembly drum as a single part.

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