JP4566981B2 - Tire manufacturing method and holing device - Google Patents

Description

  The present invention relates to a holing device suitable for manufacturing a tire in which cord-like sheet-like rubber members are laminated, and a tire manufacturing method.

  The tire is obtained from a green tire. This green tire is obtained through a molding process using a former. In this green tire, a large number of rubber members are laminated. Specific examples of the rubber member include an inner liner, a carcass ply, a sidewall rubber sheet, a belt ply, and a tread rubber sheet. The green tire is pressurized and heated in a mold. The rubber composition of a green tire flows by pressurization and heating. By heating, a crosslinking reaction occurs in the rubber composition. This process is called a vulcanization process.

  When green tires are molded, air may be caught in the green tires. This air exists between the rubber member and another rubber member. The air moves due to the flow of the rubber composition in the vulcanization process. By this movement, air can be discharged out of the green tire. However, if the movement is insufficient, air remains in the tire. In particular, air tends to remain in a tire in which the carcass ply includes a steel cord.

  Residual air hinders tire quality. For example, if air remains between the carcass ply and the sidewall, wrinkles are generated on the sidewall. Sidewalls with scissors are repaired. Repair takes time and effort. In addition, the residual air impairs the tire uniformity.

  Japanese Patent Application Laid-Open No. 2003-154579 and Japanese Patent Application Laid-Open No. 2000-301626 show an apparatus for making a hole in a rubber member of a tire. This device comprises a number of cones. This cone descends in a direction perpendicular to the carcass ply. As the cone descends, the cone penetrates the carcass ply vertically. A hole is formed in the carcass ply by the penetration. This carcass ply is laminated with another rubber member to obtain a green tire. In the vulcanization process, air is discharged from the holes.

  Japanese Patent Application Laid-Open No. 2003-154579 discloses a needle block body that can swing the needle body back and forth in the transport direction X with respect to a vertical line. This swinging occurs due to the play of the needle block body. When the steel cord and the needle body collide, the needle body escapes and damage to the cord is suppressed.

JP 2003-154579 A JP 2000-301626 A

  In order to pull out the cone penetrating the carcass ply, the cone rises. As the cone rises, the carcass ply may be lifted following the cone. In this case, although the cone is raised, it is not completely pulled out from the carcass ply. In other words, the carcass ply remains in a state where a cone is stuck. If the carcass ply is moved by the conveyor in this state, the carcass cord is damaged and the perforating process must be stopped.

  An object of the present invention is to provide a tire manufacturing method capable of manufacturing a high-quality tire.

The tire manufacturing method according to the present invention includes:
(1) A drilling step of providing a hole in a rubber member with a cord by moving the cone forward and backward,
(2) A step of obtaining a laminated member including the rubber member (3) A step of obtaining a green tire from the laminated member, and (4) A step of pressing and heating the green tire in a mold. In the perforating step, an abutting member disposed apart from the mounting surface of the rubber member is used. The contact member includes a passage hole that allows the cone to advance and retract, and an abutment surface that can contact the rubber member pulled by the cone retract.

  Preferably, in the manufacturing method, a distance between the placement surface and the contact surface is 8 mm or more and 12 mm or less.

  Preferably, in the manufacturing method, the width of the passage hole is 10 mm or more and 20 mm or less.

  Preferably, in the manufacturing method, the passage hole is circular and the diameter thereof is 10 mm or more and 20 mm or less.

  Preferably, in the manufacturing method, the cone is held with play and is swingable due to the play. The amplitude of the oscillation is 2 mm or more and 5 mm or less in the direction orthogonal to the code orientation direction.

  A holing device according to the present invention includes a cone, a moving means capable of moving the cone forward and backward toward a rubber member for a tire, a placement surface on which the rubber member can be placed, and a distance from the placement surface. And a contact member arranged. The contact member has a passage hole that allows the cone to advance and retract, and an abutment surface that can contact the rubber member pulled by the cone retracting. The cone can penetrate the rubber member placed between the mounting table and the contact member.

  The cone is reliably pulled out from the rubber member by the contact member. Therefore, damage to the cord is minimized.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 is a front view showing a holing device 10 according to an embodiment of the present invention together with a carcass ply 12. The holing device 10 includes an elevating unit 14, a driving unit 16, a mounting table 18, a contact member 19, and a conveyor 20. The carcass ply 12 is a sheet-like rubber member. The carcass ply 12 includes a large number of cords. The cord is made of steel or organic fiber. The carcass ply 12 is mounted on the mounting table 18 and the conveyor 20.

  The elevating part 14 includes a piston 22, a holder 24, a slider 26, a cone support 28 and a cone 30. The piston 22 extends in the vertical direction. The extending direction of the piston 22 is the same as the moving direction of the cone 30. The lower end of the piston 22 is connected to the upper surface of the holder 24. The holder 24 has a plate shape. The slider 26 has a rod shape. The slider 26 extends in the vertical direction. The extending direction of the slider 26 is the same as the moving direction of the cone 30. The lower end of the slider 26 is connected to the upper surface of the holder 24. The holder 24 holds the cone support 28. The cone support 28 is fixed to the bottom surface side of the holder 24. A large number of cone supports 28 are arranged at predetermined intervals. The rear end of the cone 30 is supported by the cone support 28. A cone 30 is attached to the holder 24 via a cone support 28. Although not shown, a large number of cones 30 are also arranged in the direction perpendicular to the paper surface. Specifically, three cones 30 are arranged in the direction perpendicular to the paper surface. The holder 24 is provided with a total of nine cones 30.

  The cone support 28 includes two divided bodies 28a and 28b and a connecting portion (not shown) that connects the divided bodies. The cone 30 is sandwiched between the divided body 28a and the divided body 28b. The cone 30 is fixed to the cone support 28 by this clamping. As shown in FIGS. 1 and 2, the holder 24 has a slide groove 31. 1 and 2, the opening 33 of the slide groove 31 is shown. From this opening 33, the cone support 28 is slid into the slide groove 31. A plurality of cone supports 28 are inserted into one slide groove 31. Specifically, three conical supports 28 are inserted into one slide groove 31.

  The cone 30 is replaced with the wear of the tip. By preparing the cone 30 fixed to the cone support 28 in advance, the cone 30 can be exchanged together with the cone support 28. In this replacement work, troublesome work such as tightening screws is unnecessary. By exchanging the cone 30 with the cone support 28, labor and time can be omitted.

  A gap exists between the slide groove 31 and the cone support 28. The cone support 28 is held by the holder 24 while having play. The cone 30 is held by the holder 24 while having play. Due to this play, the cone 30 can swing.

  The drive unit 16 includes a cylinder 32, a base plate 34, and a guide 36. The cylinder 32 is fixed to the base plate 34. The guide 36 is fixed to the base plate 34. The guide 36 is cylindrical. A slider 26 is passed through the guide 36.

  The mounting table 18 is located directly below the elevating unit 14. A number of holes 40 are provided in the top plate 38 of the mounting table 18. The hole 40 is a through hole. The axial direction of the hole 40 is a vertical direction. The axial direction of the hole 40 is the same as the moving direction of the cone 30. The mounting surface 39 of the top plate 38 is a flat surface. The carcass ply 12 is disposed on the placement surface 39. The carcass ply 12 moves along the placement surface 39. The hole 40 is located immediately below the cone 30. The inner diameter of the hole 40 is larger than the maximum outer diameter of the cone 30 in a portion that can be inserted into the hole 40. Further, the hole 40 has an inner diameter that does not hinder the rocking of the cone 30 due to play. The cone 30 can swing in the direction perpendicular to the paper surface in FIG. The hole 40 may be a long hole whose longitudinal direction is the direction perpendicular to the paper surface in FIG.

  Two conveyors 20 are arranged with the mounting table 18 in between. By the rotation of the conveyor 20, the carcass ply 12 is conveyed, for example, in the direction of the arrow A1. The conveying direction of the carcass ply 12 is the longitudinal direction of the carcass ply 12. Conveying means other than the conveyor 20 may be provided. An example of the other conveying means is a roller. The carcass ply 12 may be conveyed in a direction orthogonal to the paper surface of FIG.

  As shown in FIG. 1, the piston 22 is inserted into the cylinder 32. As the piston 22 slides with respect to the cylinder 32, the elevating unit 14 moves up and down. When moving up and down, the slider 26 slides on the guide 36. By this rubbing, the elevating part 14 moves up and down while the holder 24 is kept horizontal. By moving up and down, the cone 30 moves forward and backward toward the carcass ply 12. The cylinder 32 and the piston 22 constitute moving means. Other moving means may be provided. As another moving means, a motor is exemplified. In addition, in order to make an understanding easy, description of the cover part which covers the side surface of the holder 24 is abbreviate | omitted in FIG.1 and FIG.2. By this omission, the cone support 28 that is originally hidden in the lid is shown.

  The moving direction of the cone 30 is a vertical direction. The moving direction of the cone 30 is the same as the longitudinal direction of the cone 30. The normal line of the mounting surface 39 is parallel to the moving direction of the cone 30. The mounting surface 39 is horizontal.

  The cone 30 can swing in any direction. As indicated by the double arrows in FIG. 1, the cone 30 can swing in the direction in which the carcass ply 12 is conveyed. In other words, the cone 30 can swing in a direction orthogonal to the code orientation direction. In other words, the cone 30 can swing in the longitudinal direction of the carcass ply 12. Further, the cone 30 can swing in the cord orientation direction. In other words, the cone 30 can swing in a direction orthogonal to the conveying direction of the carcass ply 12. In other words, the cone 30 can swing in the width direction of the carcass ply 12.

  The cone 30 moves in a vertical direction with a constant stroke. As shown in FIG. 2, when the cone 30 is lowered to the lower limit of the stroke, the carcass ply 12 is penetrated by the cone 30. When the cone 30 rises to the upper limit of the stroke, the drilling process ends. When the cone 30 rises to the upper limit of the stroke, the tip t1 of the cone 30 is located above the passage hole 41. When the cone 30 rises to the upper limit of the stroke, the cone 30 does not exist below the lower end of the passage hole 41.

  In the drilling step, the carcass ply 12 is stopped. When the hole making process by the holing device 10 is completed, the carcass ply 12 is conveyed by the conveyor 20. The carcass ply 12 conveyed for a certain distance stops. With the carcass ply 12 stopped, the hole making process is started again. By repeating this, a large number of holes are formed at both ends in the width direction of the carcass ply 12.

  The contact member 19 is provided between the elevating unit 14 and the mounting table 18. The contact member 19 is plate-shaped as a whole. The contact member 19 has a flat plate shape as a whole.

  The contact member 19 has a passage hole 41 and a contact surface 42. The passage hole 41 is provided corresponding to the position of the cone 30. When the elevating part 14 moves up and down, the cone 30 moves up and down in the passage hole 41 of the contact member 19. The passage hole 41 allows the cone 30 to move forward (down) and backward (up). The contact member 19 is fixed. The position of the contact member 19 is constant regardless of the elevation of the elevation unit. The shape and size of the passage hole 41 are set so as not to disturb the swing of the cone 30. The shape and size of the hole 40 are also set so as not to disturb the swing of the cone 30.

  The contact surface 42 is the lower surface of the contact member 19. The contact surface 42 is substantially a flat surface. The contact surface 42 is substantially horizontal. The contact surface 42 is substantially parallel to the placement surface 39.

  FIG. 3 is a perspective view of the contact member 19. As shown in FIG. 3, nine passage holes 41 are provided corresponding to the nine cones 30. The arrangement of the passage holes 41 corresponds to the arrangement of the cones 30. Three passage holes 41 are provided at the same position in the longitudinal direction of the carcass ply 12. Three passing holes 41 are provided at different positions in the longitudinal direction of the carcass ply 12. The arrangement of the holes 40 also corresponds to the arrangement of the cones 30. Each hole 40 is located immediately below each passage hole 41. 1 and 2, the cross section of the contact member 19 is a cross section taken along the line AA in FIG. 3.

  FIG. 4 is a plan view of the carcass ply 12 in which the hole 44 is opened by the cone 30. Although not shown, the holing device 10 is provided at each of both ends in the width direction of the carcass ply 12. Two holing devices 10 are provided at each of both ends in the width direction of the carcass ply 12. By the holing device 10, a large number of holes 44 are provided at both ends in the width direction of the carcass ply 12.

  A frictional force can act between the cone 30 penetrating the carcass ply 12 and the carcass ply 12. The carcass ply 12 may follow the cone 30 due to this frictional force. When the cone 30 pierced into the carcass ply 12 is pulled upward, the carcass ply 12 may follow the cone 30 in some cases. By this tracking, the carcass ply 12 is pulled upward. When the abutting member 19 is not present, there may occur a state where the cone 30 is not pulled out from the carcass ply 12 even though the cone 30 is completely lifted. If the movement of the carcass ply 12 is started with the cone 30 sticking into the carcass ply 12, the cord of the carcass ply 12 is damaged. Specifically, damage to the cord, opening of the cord, etc. can occur. In order to avoid damage to the cord, the holing device 10 is unavoidably stopped. This stop significantly reduces tire productivity.

  The abutting surface 42 of the holing device 10 can abut on the rubber member pulled by the rising of the cone 30. The contact member 19 prevents the carcass ply 12 from being bent upward when the cone 30 is pulled out. In the holing device 10, the cone 30 is reliably pulled out of the carcass ply 12 by the contact member 19. When the cone 30 reaches the upper limit of the stroke, the cone 30 is reliably pulled out from the carcass ply 12. The contact member 19 suppresses damage to the cord in the carcass ply 12. The contact member 19 suppresses the stopping of the holing device 10. The abutting member 19 increases the productivity of the tire.

  By play, the cone 30 can be tilted. The force required to incline the cone 30 is negligible. When penetrating the carcass ply 12, a force that inclines the cone 30 may act on the cone 30. By this force, the cone 30 can be inclined. When the cone 30 is pulled out from the carcass ply 12, the inclination of the cone 30 can be eliminated by gravity. In other words, the extending direction of the cone 30 can return to the vertical direction by gravity.

  The carcass ply 12 provided with the holes 44 is supplied to the former. Other sheet-like rubber members are also supplied to the former. Examples of the other rubber member include an inner liner, another carcass ply, a sidewall rubber sheet, a belt ply, and a tread rubber sheet. An inner liner is laminated adjacent to the carcass ply 12. The carcass ply 12 and the inner liner are laminated, and another rubber member is further laminated to obtain a laminated member. The laminated member includes a carcass ply 12 and an inner liner laminated adjacent to the carcass ply 12. The laminated member is shaped by a former. A green tire is obtained by this shaping. The inner liner is laminated inside the carcass ply 12.

  This green tire is subjected to a vulcanization process. In the vulcanization process, a green tire is put into a mold. The green tire is pressurized and heated with a mold and a bladder. The rubber composition flows by pressurization and heating. The rubber causes a crosslinking reaction by heating, and a tire is obtained. In the initial stage of the vulcanization process, air existing between the carcass ply 12 and the inner liner is discharged from the green tire through the hole 44. Thereafter, the hole 44 is closed by the flow of the rubber composition.

  The adhesion of the carcass ply 12 can affect the quality of the tire. When the adhesiveness of the carcass ply 12 is lowered, the carcass ply 12 is likely to be misaligned or wrinkled during forming or vulcanization molding. This misalignment or wrinkle can deteriorate the tire quality.

  By contacting the contact surface 42, the adhesiveness of the carcass ply 12 can be lowered. The larger the contact area with the contact surface 42, the wider the range where the adhesiveness is reduced. On the other hand, as described above, the cone 30 is reliably pulled out by contact with the contact surface 42. It is preferable that excessive contact with the contact surface 42 is suppressed while ensuring contact with the contact surface 42.

  In FIG. 1, what is indicated by a double-headed arrow S1 is the distance between the mounting surface 39 and the contact surface 42. From the viewpoint of suppressing the contact area between the contact surface 42 and the carcass ply 12, the interval S1 is preferably 8 mm or more, and more preferably 9 mm or more. From the viewpoint of suppressing generation of wrinkles due to excessive lifting of the carcass ply 12, the interval S <b> 1 is preferably 12 mm or less, and more preferably 11 mm or less.

  In FIG. 1, a double arrow S <b> 2 indicates the distance between the upper surface of the carcass ply 12 and the contact surface 42. From the viewpoint of suppressing the contact area between the contact surface 42 and the carcass ply 12, the interval S2 is preferably 4 mm or more, and more preferably 5 mm or more. From the viewpoint of suppressing generation of wrinkles due to excessive lifting of the carcass ply 12, the interval S <b> 2 is preferably 10 mm or less, and more preferably 9 mm or less. The interval S2 is substantially equal to a value (S1-T) obtained by subtracting the thickness T of the carcass ply 12 from the interval S1.

  The contact surface 42 of the contact member 19 may be subjected to a surface treatment capable of suppressing rubber adhesion. By this surface treatment, the carcass ply 12 is unlikely to adhere to the contact surface 42. By this surface treatment, a decrease in adhesiveness in the carcass ply 12 can be suppressed.

  In FIG. 3, what is indicated by a double-headed arrow D <b> 1 is the diameter of the passage hole 41. From the viewpoint of preventing contact between the cone 30 and the contact member 19 when the cone 30 swings, the diameter D1 is preferably 10 mm or more, and more preferably 12 mm or more. When the diameter D1 is excessively large, the carcass ply 12 can easily enter the passage hole 41. Due to this penetration, a circular recess may be formed in the passage hole 41. This recess can reduce the adhesion between the carcass ply 12 and the laminated member adjacent thereto. In this respect, the diameter D1 is preferably 20 mm or less, and more preferably 18 mm or less.

  As described above, the carcass ply 12 is a rubber member with a cord. As the cone 30 passes through the carcass ply 12, the cone 30 can contact the cord. This contact may damage the cord or cut the cord. Damage to the cord can degrade tire quality.

  Oscillation of the cone 30 can suppress cord damage. Since the cone 30 is held with play, it can be swung by an extremely small external force. The cone 30 can be swung by a resistance force when it comes into contact with the cord. This rocking suppresses damage to the cord.

  In the above embodiment, the cone support 28 is provided for each cone 30. The cones 30 can individually swing. Since the cone support 28 is divided into pieces, the swing of a specific cone 30 and the swing of another cone 30 are not completely linked. Therefore, the cord can be avoided more effectively by swinging.

  In the above-mentioned Japanese Patent Application Laid-Open No. 2003-154579, the needle is swung by providing play in the needle block body. There is no play between the block body and the needle. A plurality (three) of needles are fixed to one needle block body. Since the three needles are fixed to the same needle block body, they move together. The movement of the needle block body is restricted by the movement of the needle having the greatest resistance among the plurality of needles of the needle block body. Other needles installed in the same needle block body move according to the movement of the needle having the greatest resistance. These other needles have insufficient escape from the cord. In addition, since the three needles fixed to the same needle block body restrain each other, the movement of each needle is restricted. As a result of insufficient escape from the cord, cord damage and carcass ply 12 opening are likely to occur. In the present embodiment, damage to the cord and the opening of the carcass ply 12 can be effectively suppressed.

  FIG. 5 is a diagram for explaining the amplitude of oscillation in the cone 30. The amplitude of the swing is measured at the tip t1 of the cone 30. In FIG. 5, a code orientation direction in the carcass ply 12 is indicated by a straight line C <b> 1. The cord orientation direction C1 coincides with the width direction of the carcass ply 12. In FIG. 5, a straight line C2 indicates a direction orthogonal to the code orientation direction C1. The direction C2 is also referred to as an orthogonal direction below. The orthogonal direction C2 coincides with the conveyance direction of the carcass ply 12. The orthogonal direction C2 coincides with the longitudinal direction of the carcass ply 12.

  As indicated by the double arrow Y1, the cone 30 can swing in the cord orientation direction C1. As indicated by the double arrow Y2, the cone 30 can swing in the orthogonal direction C2.

  In FIG. 5, what is indicated by H1 is the amplitude H1 of the cone 30 in the code orientation direction C1. In FIG. 5, what is indicated by H2 is the amplitude H2 of the cone 30 in the orthogonal direction C2. In FIG. 5, the origin G indicates the position of the tip t1 when the cone 30 is not inclined. The origin G is the starting point for measuring the amplitudes H1 and H2.

  The amplitude H1 is preferably 2 mm or more from the viewpoint that the cone 30 can easily avoid the cord and suppress the cord damage. From the viewpoint of suppressing the cord damage due to the excessive inclination of the cone 30, the amplitude H1 is preferably 5 mm or less.

  The amplitude H2 is preferably 2 mm or more from the viewpoint that the cone 30 can easily avoid the cord and suppress the cord damage. From the viewpoint of suppressing cord damage due to excessive inclination of the cone 30, the amplitude H2 is preferably 5 mm or less.

  FIG. 6 is a perspective view of the contact member 46 in the holing device according to the second embodiment of the present invention. The holing device is the same as the holing device 10 except that the abutting member 19 described above is replaced with an abutting member 46. The contact member 46 has a passage hole 48. The passage hole 48 is a long hole. A plurality of cones 30 are inserted through one passage hole 48. Specifically, the three cones 30 are inserted into one passage hole 48. The longitudinal direction of the passage hole 48 coincides with the width direction of the carcass ply 12. The longitudinal direction of the passage hole 48 coincides with the orientation direction of the cord in the carcass ply 12. The longitudinal direction of the passage hole 48 may coincide with the longitudinal direction of the carcass ply 12. By making the passage hole 48 a long hole, the alignment of the cone 30 in the longitudinal direction of the passage hole 48 can be simplified.

  In FIG. 6, what is indicated by a double arrow W <b> 1 is the width of the passage hole 48. If the width W1 is narrow, the rocking cone 30 and the contact member 19 are likely to contact each other. This contact limits the swing range of the cone 30. This contact can damage the cone 30. From the viewpoint of suppressing contact between the cone 30 and the contact member 19 when the cone 30 swings, the width W1 is preferably 10 mm or more, and more preferably 12 mm or more. When the width W <b> 1 is excessively large, the carcass ply 12 easily enters the passage hole 48 as the cone 30 rises. This penetration prevents the cone 30 from being pulled out of the carcass ply 12. In this respect, the width W1 is preferably 20 mm or less, and more preferably 18 mm or less.

  From the viewpoint of suppressing the cord damage, the swing in the orthogonal direction C2 is particularly important. The cone 30 preferably swings at least in the orthogonal direction C2.

  The higher the degree of freedom of rocking of the cone 30, the less damage to the cord. From the viewpoint of suppressing cord damage, it is more preferable to swing in the cord orientation direction C1 and the orthogonal direction C2. From the viewpoint of suppressing cord damage, it is even more preferable that the cone 30 swings in all directions. The “omnidirectional” means any direction in the plane including the code orientation direction C1 and the orthogonal direction C2. More preferably, the amplitude of oscillation in all directions is 2 mm or more and 5 mm or less.

  In the above embodiment, there is play between the cone support 28 and the holder 24, and there is no play between the cone 30 and the cone support 28. A play may be provided between the cone 30 and the cone support 28. However, when play is provided between the cone support 28 and the cone 30, an excessive force acts on the root portion of the cone 30 every time the cone 30 swings, and the durability of the cone 30 becomes a problem. In addition, when play is provided between the cone support 28 and the cone 30, it is difficult to restore the extending direction of the cone 30 to the vertical direction. From the viewpoints of rocking stability and durability, there is play between the cone support 28 and the holder 24 and play between the cone 30 and the cone support 28 as in the above embodiment. Preferably no.

  Hereinafter, the effects of the present invention will be clarified by examples. However, the present invention should not be construed in a limited manner based on the description of the examples.

[Example 1]
A carcass ply with a steel cord was prepared. The thickness T of this carcass ply is 2.25 mm. The carcass ply was subjected to a hole making process using the holing device shown in FIG. The distance S1 between the mounting surface and the contact surface was 10 mm. The diameter D1 of the passage hole was 15 mm. The carcass ply shown in FIG. 4 was obtained by this drilling step. The production line including the drilling process was put into operation and drilling with a holing device was repeated. In this production line, the following (1) to (3) were repeated.
(1) Carcass ply conveyance stop (2) Hole making (3) Carcass ply carrying a certain distance The production line was operated until the hole was made 1000 times. When the carcass ply is transported after the drilling, if the carcass ply is caught on the cone, the production line is stopped.

[Examples 2 to 9]
Carcass plies of Examples 2 to 9 were obtained in the same manner as in Example 1 except that the distance S1 and the diameter D1 were as shown in Table 1 below. These evaluation results are shown in Table 1 below.

[Comparative Example 1]
The same holing apparatus as in Example 1 was used except that no abutting member was provided. A carcass ply of Comparative Example 1 was obtained in the same manner as Example 1 except that this holing device was used. The specifications and evaluation results of Comparative Example 1 are shown in Table 1 below.

[Scratches of code]
The cords were observed with a microscope at 200 locations in the vicinity of the holes. When one or more code flaws were found, it was judged as “Cord flawed”, and when no code flaw was found, it was designated as “No code flawed”. The evaluation results are shown in Table 1 below.

[Number of production line stops]
Table 1 below shows the number of stoppages of the production line until 1000 holes are made. The smaller the number of stops, the higher the productivity.

[Adhesive strength of carcass ply]
The adhesive strength was measured at 8 locations where the holes were formed. The eight measurement positions p1 are shown in FIG. The average value of the adhesive strength at 8 locations is shown in Table 1 below.

[Example 10]
The carcass ply shown in FIG. 4 was obtained in the same manner as in Example 1 except that the holing device according to the second embodiment was used. This holing device includes the contact member shown in FIG. In this contact member, the width W1 of the passage hole was 15 mm. The amplitude H1 of the cone in the code orientation direction was 4 mm. The cone amplitude H2 in the orthogonal direction was also 4 mm. The specifications and evaluation results of this example are shown in Table 2 below.

[Examples 11 to 18]
Carcass plies of Examples 11 to 18 were obtained in the same manner as Example 10 except that the width W1, amplitude H1, and amplitude H2 were as shown in Table 2.

[Comparative Example 2]
The same holing apparatus as in Example 10 was used except that no abutting member was provided. A carcass ply of Comparative Example 2 was obtained in the same manner as Example 10 except that this holing device was used. The specifications and evaluation results of Comparative Example 2 are shown in Table 2 below.

[Code scratch rate]
The cords were observed with a microscope at 100 locations in the vicinity of the holes. Of the 100 locations, the ratio of locations where code scratches were found is shown in Table 2 below as “Code scratch occurrence rate”. The number of places where the code flaw is recognized is the numerator, and the number of places observed, that is, 100 is the denominator.

  As shown in Tables 1 and 2, the examples have higher evaluations than the comparative examples. From this result, the superiority of the present invention is clear.

  The present invention can be applied to any tire.

FIG. 1 is a front view showing a holing device according to an embodiment of the present invention together with a carcass ply. FIG. 2 is a front view showing the holing device of FIG. 1 together with the carcass ply. FIG. 3 is a perspective view of the contact member. FIG. 4 is a perspective view of a carcass ply in which holes are provided by a holing device. FIG. 5 is a diagram for explaining the amplitude of the cone. FIG. 6 is a perspective view of a contact member according to another embodiment.

DESCRIPTION OF SYMBOLS 10 ... Holing apparatus 12 ... Carcass ply 14 ... Elevating part 16 ... Drive part 18 ... Mounting stand 19, 46 ... Contact member 20 ... Conveyor 22 ... Piston 24 ... Holder 28 ... Conical support 30 ... Conical 32 ... Cylinder 40 ... Hole 41, 48 ... Passing hole 42 ... Contact surface 44 ... Hole

Claims (8)

A step of making a hole in the rubber member containing the cord by moving the cone forward and backward, and
A step of obtaining a laminated member including the rubber member;
A step of obtaining a green tire from the laminated member;
The green tire is pressurized and heated in a mold,
In the punching step, a contact member disposed away from the mounting surface of the rubber member is used,
The contact member has a passage hole that allows the cone to advance and retreat, and a contact surface that can contact the rubber member pulled by the cone retraction ,
Each of the cones is held with play, and each of the cones can swing due to the play, and the swing direction is at least perpendicular to the cord orientation direction and the direction. der Ru method of manufacturing a tire.   The manufacturing method according to claim 1, wherein an interval between the placement surface and the contact surface is 8 mm or more and 12 mm or less.   The manufacturing method according to claim 1, wherein a width of the passage hole is 10 mm or more and 20 mm or less.   The manufacturing method according to claim 1, wherein the passage hole is circular and has a diameter of 10 mm or more and 20 mm or less. 5. The manufacturing method according to claim 1, wherein the amplitude of rocking of the cone is 2 mm or more and 5 mm or less in a direction orthogonal to the code orientation direction. Each of the cones is supported by one cone support,
The holder is connected to the moving means for moving the cone forward and backward,
The manufacturing method according to claim 1, wherein each cone support is held with play in the holder. With a cone,
Moving means capable of moving the cone forward and backward toward a rubber member for tires;
A mounting surface on which the rubber member can be mounted;
A contact member disposed away from the mounting surface;
The abutment member has a passage hole which may allow advancement and retraction of the cone, and a contact surface which can contact with the rubber member is pulled by the retraction of the cone,
Each of the cones is held with play, and each of the cones can swing due to the play, and the swing direction is at least perpendicular to the cord orientation direction and the direction. And
A holing device in which the cone can penetrate the rubber member placed between the mounting table and the contact member. A cone support attached to each cone, and
A holder connected to the moving means,
The holing device according to claim 7, wherein each of the cone supports is held with play in the holder.

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