JP3437662B2 - Method for manufacturing tire member - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt layer constituting a belt applied to a pneumatic tire, wherein a steel cord or steel wire having a wavy shape is applied to a tire equatorial plane. The present invention relates to a method for producing a tire member for obtaining a so-called circumferential wavier belt layer arranged in a direction parallel or substantially parallel to the tire as an unvulcanized member before molding the tire. Can be manufactured with precision,
Furthermore, the present invention relates to a method for producing a tire member that can exhibit excellent durability as a belt layer of a product tire. [0002] In preparing the above-mentioned wavy belt layer member, the following two production methods are well known. First, a plurality of steel cords or a plurality of steel wires are first corrugated using a pair of gear-shaped bracing devices or other bracing means, and then the corrugated steel cords or corrugations are applied. This is a production method in which a steel wire is coated with unvulcanized rubber by a calendaring operation to obtain a wavy belt layer member. [0003] Second, as disclosed in Japanese Patent Application Laid-Open No. 3-27928, first, a plurality of rubber-coated wire sheets are bitten by a pair of gear-shaped rolls to form a vertical waveform, and thereafter, This is a manufacturing method in which a wavy belt layer member is obtained by passing a hauled wire sheet between a pair of rolls so as to flatten a vertical waveform into a flat shape. [0004] However, one of the above manufacturing methods is to form a hard and highly resilient steel cord or steel wire itself into a waveform by a strong action force by a gear or other means. Due to the habit, it is inevitable that the brass-plated portion, which is indispensable for bonding with the rubber applied to the filament or wire constituting the cord, will be damaged, and the background of the steel material will be exposed. If the thus manufactured wavy belt layer member is applied to a pneumatic tire, particularly a radial tire, the exposed portion of the steel ground cannot be bonded to the rubber, so that the actual running of the tire can be prevented. As the process proceeds, a peeling phenomenon, that is, the occurrence of separation failure occurs from the exposed portion, and sometimes the durability tends to be remarkably reduced. Further, in the above two manufacturing methods, although the rubber is interposed between the wire for applying the waveform and the gear-shaped roll in a non-vulcanized state, the above-mentioned tendency to decrease the durability is reduced. Although it can be avoided, the longitudinal wave formed on the wire once in the state of a wire rubber sheet is forced to fall down into a transverse wave state between a pair of rolls, so the restraining force of the rubber resists this and the wire There is a disadvantage in terms of quality in that it does not fall down sufficiently and therefore it is not possible to obtain the desired high-precision wavy belt member. [0007] Accordingly, the disadvantages described above can be advantageously avoided, that is, sufficient durability can be exhibited as a belt layer of a pneumatic tire, and the steel cord or steel wire inside the wavy belt layer member has a layer surface. SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple method for manufacturing a member for a tire, which can obtain belt layer members arranged in accordance with precise regularity as complete transverse waves along the line. [0008] In order to achieve the above object, a method of manufacturing a tire member according to the present invention is directed to a method of manufacturing a tire member, comprising using one of a steel cord and a steel wire with an unvulcanized rubber. A step of coating with the composition to form a long rubber-coated unit member, and an interval control for aligning a plurality of the unit members side by side at predetermined intervals in a range that does not contact each other.
After passing through the guide member to make a long rubber-coated unit member bundle,
Supplying the member bundle between a pair of rotating press-fitting gears, and subjecting the member bundle to a direction between rotation axes of the gears to form a longitudinally corrugated member bundle; Is supplied to a rotatable corrugated turning roll to form a transverse corrugated member bundle in which the longitudinal waveform of each steel cord or each steel wire in the member bundle is turned into a transverse waveform along the width direction of the member bundle; and Supplying the corrugated member bundle to a rotating pressure roll to form a long transverse corrugated steel cord strip member or a long transverse corrugated steel wire strip member. First, one steel cord or one steel wire previously coated with an unvulcanized rubber composition is used as a long rubber-coated unit member, and a plurality of unit members are collectively controlled for distance control. After the guide members are passed through each unit member at a predetermined interval, desirably a long rubber-coated unit member bundle aligned side by side at a small interval such that the distance between the unit members does not closely adhere to each other, and then a pair of pressurizations is performed. Since the longitudinal wave is formed for each unit member of the member bundle for the first time through the custom gear, a covering rubber is interposed between the custom gear and each steel cord or each steel wire during this time, As a result, it is possible to avoid damage to the cord or the wire due to the hammering gear, and therefore it is possible to sufficiently maintain the durability of a product tire using this member bundle as an intermediate member. Next, by supplying the vertical corrugated member bundle to a rotatable corrugated turning roll, all the vertical corrugated unit members are pushed down in the same direction, thereby turning the vertical corrugated of each steel cord or steel wire into a horizontal corrugated. be able to. What is important here is that there is sufficient space between the unit members of the bundle of longitudinally corrugated members after passing through a pair of pressurizing hammer gears for turning from a vertical arrangement to a horizontal arrangement of waveforms. This means that the restraining or resisting force of the rubber against this deflection does not affect this deflection behavior by applying the appropriate tension to the bundle of longitudinally corrugated members. Therefore, when the longitudinal corrugated member bundle passes between the corrugated turning rolls, each corrugated steel cord or each corrugated steel wire is easily and accurately turned from a longitudinal wave state to a transverse wave state along the width direction of the member bundle, and is uniform. A horizontal wave arrangement is used. [0011] This is not the case, that the peaks and valleys in the corrugations of each steel cord or each steel wire in the long transverse corrugated member bundle are aligned with each other as a whole, and that each steel cord or each steel wire is aligned. It is not without exception that the mutual intervals are aligned. Therefore, a highly accurate wavy belt layer member can be obtained. Next, the bundle of long transverse corrugated members is pressed by a pressure roll to fill gaps between the unit members with a covering rubber of a cord or a wire to form an integral strip member, and upper and lower surfaces adapted to the next forming step Is finished to a smooth long transverse corrugated steel cord strip member or a long transverse corrugated steel wire strip member, and the transverse wave arrangement is not disturbed in this step. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below with reference to FIGS. FIG. 1 is a schematic illustration of a front view of a main part of a device using a steel cord 1 as a rubber-coated unit member, and FIG. 2 is a diagram showing a device for finishing a rubber-coated unit member into a transversely corrugated steel cord strip member. It is a diagrammatic side view of a part. In FIG. 1, reference numeral 2 denotes a reel on which a long steel cord 1 has been previously wound, and reference numeral 3 denotes a rubber coating for coating the steel cord with an unvulcanized rubber composition (hereinafter abbreviated as rubber). It is an apparatus, and usually uses an extruder provided with a rubber coating die. The diameter of the exit hole of this base (diameter of the cylindrical hole on the right side of the figure) is 0.2 to
Set 0.8 mm larger. The steel cord 1 pulled out from the reel 2 is introduced into the mouthpiece of the extruder 3, and the steel cord 1 is coated with rubber to form a rubber-coated unit member 1a.
a is wound on a reel 4. The reel 4 is uniformly and loosely wound by rotating the reel 4 by a rotation driving means (not shown). The coating rubber thickness is about 1/2 of the difference between the diameter of the outlet hole and the diameter of the cord. In the illustrated example, a single rubber-coated unit member 1a is manufactured, and a plurality of or a plurality of rubber-coated unit members 1a can be simultaneously obtained by a single extruder. In FIG. 2, a plurality (twelve in the illustrated example) of the reels 4 on which the unit member 1a has been wound are rotatably mounted on a support device (not shown). Each reel 4 is preferably arranged in alignment and preferably exerts a gentle braking force. The unit members 1a are unwound from the respective reels 4 and are aligned side by side through the guide holes of the spacing control / guide member 5, and the alignment is performed by the unit members 1a.
Are formed to form a long bundle of rubber-coated unit members 6 which are kept at a small interval so as not to contact each other. In addition, a tension is applied to the member from the unwinding portion of the unit member 1a to the winding portion of the strip member 12 by the gentle braking force of the reel 4 and the rotational driving force of the winding member of the strip member 12 described later. The rubber-coated unit member bundle 6 is supplied between a pair of rotating press-fitting gears 7 to form a waveform on the member. At this time, the pair of gears are synchronized so that the peaks and valleys mesh with each other.
Of course, it is sufficient to cause corrugated plastic deformation in each steel cord. As is apparent from FIG. 2, the waveform thus formed is a longitudinal waveform which is formed by applying a direction between the rotation axes of the pair of gears 7. Here, the waveform may be a sine wave shape or a zigzag shape, and the period and amplitude of the wave are determined by appropriately selecting the cross-sectional shapes of the teeth of the pair of custom gears 7. Is suitable for spur gear type. In the case where the member bundle 6 is wide as shown in the figure, it is appropriate to call it a roll-shaped gear 7 rather than a gear. The member bundle that has passed through the pair of pressurizing hammer gears 7 becomes a longitudinal wave member bundle 8 that forms a longitudinal wave for each unit member 1a. Next, the longitudinal wave member bundle 8 is supplied to a rotatable waveform turning roll 9 to turn the longitudinal wave into a transverse wave. At that time, all the unit members 1a of the vertical corrugated member bundle 8 at the start of the work
The tip part of is dropped in the same direction by a jig used temporarily or manually. Thereafter, a rotational force in the same direction is naturally applied to each unit member 1a which is a continuous body by the above-mentioned tension acting on all the unit members 1a. As a result, each unit member 1a
Can be easily and reliably turned in the same direction. Due to the function of turning from the longitudinal wave to the shear wave, the waveform turning roll 9 plays a role that can be called a roll-over roll. The waving operation by one corrugating turning roll 9 is effective when the tension acting on the vertical corrugated member bundle 8 is relatively large. However, when a more reliable waving operation is desired or when the tension acting on the longitudinal corrugated member bundle 8 is relatively small, it is desirable to use the pressing roll 9 'shown in FIG. The pressing roll 9 ′ is configured to apply an appropriate pressing force to the corrugating turning roll 9. The relatively small tension refers to a relative tension when the steel cord diameter is large or when the amplitude of the waveform is small and the wavelength is long. In other words, when the steel cord diameter is small, the waveform amplitude is large, and the waveform wavelength is short, the same tension is regarded as a relatively large tension. The horizontal corrugated member bundle 10 in which all the unit members are turned into a horizontal corrugation is supplied to the next pressure roll 11. The members so far are referred to as a bundle because each unit member does not necessarily have to be completely integrated because there are irregularities on the surface, and the unit members do not always need to be completely integrated.
For the first time, the transverse corrugated member bundle 10 is elongated by the rolling operation of the steel cord strip member 1 having a strip-shaped flat surface.
It becomes 2. This member 12 is wound around a winding tool (not shown) with a predetermined tensile force in the direction of arrow A shown in the figure, and is completed here as a tire member. In another embodiment different from the above, when a large tension is required for the waving operation, the corrugated turning roll 9 or the corrugated turning roll 9 and the holding roll 9 are preferably provided as shown in FIG. A tension roll 13 is provided between the pair 9 ′ (illustrated example) and the pressure roll 11. Since the tension roll 13 functions to apply a desired tension to the member bundles 8 and 10, it has not only a function of applying a large tension but also a function of adjusting the magnitude of the tension. It can be called a means. While the pressure rolls 11 shown in FIG. 3 are configured as a pair with two rolls, the single pressure roll 11 is shown in FIG. 2 because it is possible to perform the rolling action in any configuration. This is because In addition to the rolling operation using three or four calender rolls 11 in FIG. 3, a thin gauge rubber sheet can be added. When the tension roll 13 is provided, as shown in FIG.
8 and the surface of the member 12 may be substantially coplanar,
On the other hand, in the embodiment shown in FIG. 2, the corrugated turning roll 9 is positioned above the position shown in FIG. 3, and the surface of the member bundle 8 has an upward gradient and the surface of the member bundle 10 has a downward gradient. . Although the embodiment of the steel cord has been described above, it is possible to use a steel wire instead. In this case, too, a long transversely corrugated steel wire strip member 12 'is formed in the same manner as described above. Obtainable. Further, in addition to the above embodiment, the order of the steps can be changed. For example, after a plurality of rubber-coated unit members 1a are firstly subjected to a vertical waving process by a pair of waving gears 7 and then passed through a spacing control / guide member 5, the same long member as described above is obtained. A transverse corrugated steel cord strip member 12 or a long transverse corrugated steel wire strip member 12 'can also be obtained. Next, an evaluation of the comparison between the example and the conventional examples 1 and 2 was carried out according to the following items and test methods. Conventional Example 1 is in accordance with the above-described method of forming a corrugation directly on a steel cord, and Conventional Example 2 is also in accordance with the above-described method of forming a corrugation on a rubberized strip. Evaluation items: (1) Size and presence / absence of surface damage of steel cord. (2) Accuracy of transverse waveform. First, in the test method of the above-mentioned item 1, the paint is directly applied to the steel cord, and then the rubber cord is applied to the steel cord, the corrugated cord is taken out of the corrugated cord, and a picture is taken. A method of measuring the total area of the paint peeled portion per 1 m) was used. The results are as follows. (Example 1): There is no peeled portion. (Conventional example 1); 50 mm ² / m (Conventional example 2); 10 mm ² / m The test of the second term is that the (a) cord waveform (amplitude / wavelength) in the finished transversely corrugated steel cord strip member is used. Accuracy measurement, (b) measurement of variation in code interval (expressed as a code diameter ratio), and (c) observation of code waveform laterality (coplanarity of code center line). The test results are as follows. (Example); Item (a): ± 0.1% or less, Item (b): ±
2%, item (c): extremely good. (Conventional Example 1); Item (a): ± 0.1% or less, Item (b):
± 10%, item (c): extremely good. (Conventional Example 2); Item (a): ± 1.5%, Item (b): ± 3
0%, item (c): a horizontal waveform is not formed, and most of the code waves are standing and extremely defective. From the above test results, the laterally corrugated steel cord strip member 12 of the embodiment has an intact cord surface,
It can be seen that a highly accurate horizontal waveform is formed. On the other hand, in the conventional example 1, the level of the horizontal waveform is almost equal to that of the embodiment except for the variation of the code interval related to the alignment of the codes, but the code surface is in contrast to the embodiment. The damaged part of the tire is large, and this is insufficient to provide sufficient durability as a tire. In addition, the reason why the damaged portion of Conventional Example 2 showed an unexpectedly large value was that an excessive pressing force was applied when turning from a longitudinal wave to a transverse wave, and despite that, the above (a) to ( Item c) shows a remarkably bad result, which does not provide the desired performance and durability of the tire, and is not practical. According to the present invention, a wavy belt capable of maintaining high accuracy and sufficient durability using a relatively simple device and sufficiently satisfying the demands of tires can be obtained. A method for producing a tire member as a layer can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a method for manufacturing a long rubber-coated unit member according to the present invention. FIG. 2 is an explanatory view of a method for manufacturing a tire member according to the present invention. FIG. 3 is a main part side view for explaining another method for manufacturing a tire member according to the present invention. [Description of Signs] 1 Steel cord, steel wire 1a Rubber-coated unit member 2, 4 reel 3 Extruder 5 Interval control / guide member 6 Rubber-coated unit member bundle 7 Pressing hammering gear 8 Vertical corrugated member bundle 9 Waveform turning roll 9 'holding roll 10 horizontal corrugated member bundle 11 crimping roll 12 horizontal corrugated steel cord strip member 13 tension roll

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29D 30/00-30/72 B29C 47/00-47/96 D07B 1/00-1/22

Claims (1)

(57) [Claim 1] A step of coating one of a steel cord and a steel wire with an unvulcanized rubber composition to form a long rubber coated unit member. After a plurality of the unit members are arranged side by side at predetermined intervals in a range where they do not come into contact with each other, the unit members are passed through an interval control / guide member to form a long rubber-coated unit member bundle, and then a pair of pressurizations for rotating the member bundle A process in which the bundle of members is supplied between the gears, and the member bundle is subjected to a bending process in a direction between the rotation axes of the respective gears to form a vertical corrugated member bundle; and the vertical corrugated member bundle is supplied to a rotatable corrugated turning roll. ,
A step of turning a longitudinal corrugation of each steel cord or each steel wire in the member bundle into a lateral corrugation along a width direction of the member bundle to form a transverse corrugated member bundle; and supplying the transverse corrugated member bundle to a rotating pressure roll. Producing a long transversely corrugated steel cord strip member or a long transversely corrugated steel wire strip member.