JP5293116B2 - End treatment method and apparatus for rubber member with reinforcing cord - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an end processing method of a reinforcing corded rubber member and an apparatus therefor, wherein the method improves reducing effect of rigidity difference between a joint part and other parts when both end parts are joined one above the other. <P>SOLUTION: Abutting ends 10, 11 are formed by heating a reinforcing corded rubber member 3 on a heating plate 6 while being clamped with a pressing cylinder 1 and pulled horizontally with a traction cylinder 2, and thereafter cutting with a hot scalpel 7. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method and an apparatus for treating an end portion of a rubber member with a reinforcing cord, and more specifically, when both ends are overlapped and joined together, a difference in rigidity between the joined portion and other portions is reduced. The present invention relates to a method and apparatus for processing a rubber member containing a reinforcing cord.

  A carcass member used for a pneumatic tire is manufactured by joining both ends of a rubber member in which a reinforcing cord such as a steel cord or an organic fiber cord is embedded to form an annular shape. In order to withstand the tensile force applied during the molding of the pneumatic tire, the joining method is performed by laminating both end portions one above the other. However, when the joining end portions are stacked one above the other in this manner, the arrangement of the reinforcing cords in the joining portion becomes denser than the other portions, so that the circumferential rigidity becomes non-uniform and the uniform of the manufactured pneumatic tire becomes uniform. There was a problem that Mitty would fall.

  In order to solve such a problem, Patent Document 1 discloses that a part of a rubber member with a reinforcing cord is deformed into a V shape and heated while being pulled to roughen the arrangement of the reinforcing cord, and then cut and joined. Proposes an edge method.

However, in the above method, since the rubber member with the reinforcing cord is deformed into a V shape, a difference in expansion occurs between the tip portion and the skirt portion of the V shape, and the intervals between the reinforcing cords are not uniform. There is a problem that the effect of reducing the difference in rigidity between the portion and other portions is low. In addition, since a V-shaped deformation remains in the joint portion of the rubber member with the reinforcing cord, there is a problem that the joining work becomes difficult.
Japanese Patent No. 2831102

  The object of the present invention is to improve the effect of reducing the difference in rigidity between the joint and other parts when both ends are overlapped and joined together, and the rubber with a reinforcing cord that can be easily joined An object of the present invention is to provide a member end processing method and an apparatus therefor.

  An end treatment method for a rubber member with a reinforcing cord according to the present invention that achieves the above object is an end treatment method for a rubber member in which a plurality of parallel reinforcing cords that are joined with both ends thereof being stacked one above the other are embedded. And sandwiching the two portions in the longitudinal direction of the rubber member, pulling the sandwiched portion in a direction substantially perpendicular to the reinforcing cord, and extending the pulled portion between the reinforcing cords along the reinforcing cord. It is characterized by cutting.

  In the method for treating an end portion of the rubber member with the reinforcing cord, after heating the stretched portion of the rubber member, the rubber cord is cut between the reinforcing cords along the reinforcing cord or the portion where the rubber member is sandwiched is heated. After that, it is desirable to pull in a direction substantially orthogonal to the reinforcing cord. At that time, the tensile force and the heating temperature of the rubber member with the reinforcing cord should satisfy the conditions on the higher elongation side than the inflection point in the stress-elongation characteristics of the rubber composition constituting the rubber member with the reinforcing cord. Is desirable. Moreover, it is good to pull so that the elongation of the rubber member containing a reinforcement cord may be 150 to 300%.

  An end treatment device for a rubber member with a reinforcing cord according to the present invention that achieves the above object is an end treatment device for a rubber member in which a plurality of parallel reinforcing cords that are joined with both end portions stacked vertically are embedded. The rubber member includes a tensile unit that sandwiches two portions in the longitudinal direction of the rubber member and pulls the stretched portion in a direction substantially orthogonal to the reinforcing cord, and a cutting unit that cuts the pulled portion between the reinforcing cords. It is characterized by this.

  The end treatment apparatus for a rubber member with a reinforcing cord preferably further includes a heating means for heating the rubber member, and the heating means is preferably a heating plate that sandwiches and heats the rubber member with a reinforcing cord.

  The method and apparatus for treating an end portion of a rubber member containing a reinforcing cord according to the present invention is suitably used for manufacturing a carcass member of a pneumatic tire.

  According to the method and apparatus for treating an end of a rubber member with a reinforcing cord according to the present invention, the longitudinal direction of the rubber member with a reinforcing cord is sandwiched at two locations, and the sandwiched portion is pulled in a direction substantially perpendicular to the reinforcing cord. In this state, the reinforcing cord-containing rubber member is cut between the reinforcing cords along the reinforcing cords so that the joining end portions are formed. Therefore, the effect of reducing the difference in rigidity between the joined portion and the other portions can be improved when both end portions are joined one above the other. Further, since the joining end portion is not deformed, the joining operation can be facilitated.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example of an end portion processing apparatus for carrying out the end portion processing method for a rubber member with a reinforcing cord according to the present invention.

  This end processing apparatus is installed in a manufacturing process of a carcass member in a tire molding process, and pulling means composed of a pressing cylinder 1 and a tension cylinder 2 is arranged along the conveying direction (longitudinal direction) of the rubber member 3 with a reinforcing cord. A pair is arranged. The head portions 4 of the two pressing cylinders 1 operate so as to press the rubber member 3 with a reinforcing cord toward the head portion 5 of the tension cylinder 2 positioned below. Further, the head portions 5 of the two tension cylinders 2 are arranged so that the upper surfaces thereof are along the bottom surfaces of the rubber members 3 with the reinforcing cords, and operate so as to move in the opposite directions parallel to the transport direction. Examples of the pressing cylinder 1 and the tension cylinder 2 include actuators driven by hydraulic pressure or pneumatic pressure. Between the tension means, a heating means composed of a heating plate 6 for sandwiching and heating the rubber member 3 with a reinforcing cord from above and below and a cutting means composed of a hot knife 7 for heating a flat blade are installed. . The rubber member 3 with a reinforcing cord is formed by embedding a reinforcing cord 8 such as a steel cord or an organic fiber cord in a belt-like rubber material 9 so as to be parallel to each other. It is conveyed in the direction orthogonal to the reinforcing cord 8 between the head portion 5.

  A method for treating the end of a rubber member with a reinforcing cord using such an end treating apparatus will be described below.

  First, as shown in FIG. 2A, the rubber member 3 with the reinforcing cord is pressed from above by the head portions 4 of the two pressing cylinders 1 and between the head portion 5 of the tension cylinder 2 disposed below. Hold with. The distance between the two pressing cylinders 1 may be set so that 8 to 15 reinforcing cords 8 are included. Then, as shown in FIG. 2 (b), the head part 4 of the pressing cylinder 1 and the head part 5 of the tension cylinder 2 are opposed to each other in the conveying direction in a state where the rubber member 3 with the reinforcing cord is sandwiched. Move to. Thereby, since the rubber member 3 with the reinforcing cord is pulled in a direction substantially orthogonal to the reinforcing cord 8, the interval between the reinforcing cords 8 of the rubber member 3 with the reinforcing cord is widened between the head portions 4 of the pressing cylinder 1, and the density thereof is increased. Lower. Next, as shown in FIG. 2C, the pulled portion is sandwiched and heated by the heating plate 6 from above and below. After this heating is performed for a predetermined time so as to maintain the shape, the heating plate 6 is pulled up and the rubber material 9 between the reinforcing cords 8 is made into the reinforcing cords 8 by the hot knife 7 as shown in FIG. Cut in parallel (perpendicular to the paper surface) to form the joining end 10. Finally, after returning the head part 4 of the pressing cylinder 1 and the head part 5 of the tension cylinder 2 to the original state, the rubber member 3 with the reinforcing cord is conveyed to a position where a joining end part on the other end side is formed.

  In the end portion processing method described above, the reinforcing cord-containing rubber member 3 may be softened and easily stretched by performing a heating step before the pulling step shown in FIG.

  As shown in FIG. 3, the joining end 10 formed in this way is joined to the carcass member 12 by being overlapped and bonded to the joining end 11 similarly formed on the other end side. Become. At this time, since the joint ends 10 and 11 that overlap vertically are pulled in a substantially horizontal direction, the arrangement of the reinforcing cords 8 is rough and the intervals between the reinforcing cords 8 are equal. The effect of reducing the rigidity difference between the portion 13 and other portions can be improved. Further, since the joining end portions 10 and 11 are not deformed, the joining operation can be facilitated. Furthermore, when the reinforcing cord-containing rubber member 3 is heated while being pulled in the horizontal direction, shrinkage of the joining end portions 10 and 11 after heating can be suppressed, and the dimensional accuracy of the carcass member 12 can be maintained.

  The tensile force by the tension cylinder 2 and the heating temperature by the heating plate 6 in the above end treatment method are the stress-elongation characteristics of the rubber composition constituting the rubber member 3 with the reinforcing cord as shown in FIG. It is desirable to set so as to satisfy the condition on the higher extension side than the inflection point 14 in the -S curve. Here, the inflection point 14 refers to a point where the secondary differential value becomes zero.

  By setting the tensile force and the heating temperature in this way, the rubber member 3 with the reinforcing cord can be evenly extended, so the effect of reducing the difference in rigidity between the joint portion 13 and other portions is further improved. can do.

  The elongation of the rubber member 3 with the reinforcing cord is preferably 150 to 300% of the original length, more preferably 250 to 300%. By doing in this way, the reinforcement cords 8 of the upper and lower joining end portions 10 and 11 are bonded so that they are alternately positioned in the circumferential direction, so that the interval between the reinforcement cords 8 in the joining portion 13 is reinforced in other portions. The effect of reducing the difference in rigidity between the joint portion 13 and other portions can be further improved by setting the distance to the same distance as the cord 8.

It is the edge part processing apparatus of the rubber member containing a reinforcement cord which consists of embodiment of this invention. It is process drawing explaining the edge part processing method of the rubber member containing a reinforcement cord of 1st and 2nd invention, Comprising: (a) is the process which clamps the rubber member containing a reinforcement cord, (b) is the reinforcement which was clamped The step of pulling the corded rubber member, (c) shows the step of heating the pulled rubber member with the reinforcing cord, and (d) shows the step of cutting the rubber member with the reinforcing cord after heating. It is an enlarged view of the junction part of the rubber member containing a reinforcement cord. It is a figure which shows the example of the stress-elongation characteristic of a rubber composition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press cylinder 2 Tensile cylinder 3 Rubber member with a reinforcement cord 4 Head part (press cylinder)
5 Head (Tension cylinder)
6 Heating plate 7 Hot knife 8 Reinforcement cord 9 Rubber material 10 Joining end 11 Joining end 12 on the other end side Carcass member 13 Joining part 14 Inflection point

Claims (10)

A rubber member end processing method in which a plurality of mutually parallel reinforcing cords that are joined with the both ends overlapped vertically are embedded,
Reinforcement that sandwiches two portions in the longitudinal direction of the rubber member, pulls the sandwiched portion in a direction substantially orthogonal to the reinforcement cord, and cuts the stretched portion between the reinforcement cords along the reinforcement cord A method for treating an end portion of a corded rubber member.   The method for treating an end portion of a rubber member with a reinforcing cord according to claim 1, wherein the stretched portion of the rubber member is heated and then cut between the reinforcing cords along the reinforcing cord.   The end portion processing method for a rubber member with a reinforcing cord according to claim 1 or 2, wherein two portions in the longitudinal direction of the rubber member are sandwiched, and the sandwiched portion is heated and then pulled in a direction substantially perpendicular to the reinforcing cord. .   The tensile force and the heating temperature of the rubber member with a reinforcing cord satisfy the conditions on the higher elongation side than the inflection point in the stress-elongation characteristics of the rubber composition constituting the rubber member with the reinforcing cord. The end part processing method of the rubber member containing a reinforcement cord of 2 or 3.   The method for treating an end of a rubber member with a reinforcing cord according to any one of claims 1 to 4, wherein the rubber member with a reinforcing cord is pulled so that an elongation of the rubber member with a reinforcing cord is 150 to 300%.   The method for treating an end portion of a rubber member with a reinforcing cord according to any one of claims 1 to 5, wherein the rubber member with a reinforcing cord is used as a carcass member of a pneumatic tire. A rubber member end processing apparatus in which a plurality of parallel reinforcing cords that are joined with the both ends overlapped vertically are embedded,
Entering a reinforcing cord comprising tension means for sandwiching two portions in the longitudinal direction of the rubber member and pulling in a direction substantially orthogonal to the reinforcing cord, and cutting means for cutting the pulled portion between the reinforcing cords Rubber member end treatment equipment.   The end processing apparatus for a rubber member with a reinforcing cord according to claim 7, further comprising a heating means for heating the rubber member.   The end treatment apparatus for a rubber member with a reinforcing cord according to claim 8, wherein the heating means is a heating plate that sandwiches and heats the rubber member with a reinforcing cord.   The end treatment apparatus for a rubber member with a reinforcing cord according to any one of claims 7 to 9, wherein the rubber member with a reinforcing cord is used as a carcass member of a pneumatic tire.

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