JP2013091194A - Pressing roller for tire molding, and method for pressing rubber material for the tire molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressing roller for tire molding and a method for pressing rubber material for the tire molding, capable of reducing a burden on an operator by eliminating re-pressing work performed by a manual roller, not causing a residual air in a joint portion and separation of a joint, and preventing the rubber material from wrinkling.SOLUTION: This pressing roller for the tire molding is configured to press and press-fix the joint portion formed by overlapping both the ends of the rubber material wound around a former with each other. In the pressing roller for the tire molding, the diameter of a center portion in a roller axial direction is formed into an inverted crown shape having a diameter smaller than those of both the ends. The method for pressing the rubber material for the tire molding press-fixes the joint portion in such a manner that by using the pressing roller for the tire molding, the joint portion formed by overlapping both the ends of the rubber material wound around the former with each other is pressed by pressing force of 390-590N.

Description

  The present invention relates to a pressure roller for tire molding and a pressing method for pressing a joint portion of a rubber material for tire molding wound around a cylindrical former of a tire molding machine.

  When forming a raw tire, it is necessary to press the formed joint portion after the rubber material is wound around the former, and then press the joint portion while eliminating air remaining in the joint portion. The joint part is crimped by the method shown in FIG.

  That is, the two-stage molding machine A is provided with a former A1 (first former), and a rubber material 43 supplied from a servicer (not shown) is wound around the former A1 so that the circumferential direction of the rubber material 43 is increased. Both end portions 43a and 43b are overlapped to form a joint portion 44.

  The joint portion 44 is pressed and pressed against the former A1 with a predetermined pressing force by the pressing device A2 that moves in the direction of the arrow on the former A1.

  Specifically, the pressing device A2 includes a tire molding press roller 1 that rolls along the joint portion 44 while pressing the joint portion 44, a holder A21 that pivotally supports the tire molding press roller 1, and a joint portion. 44. A moving body A22 that reciprocates in the former axial direction along 44, a cylinder A23 that is supported by the moving body A22 and that presses the tire forming press roller 1 toward the joint portion 44, and a tire forming press roller 1 And a control unit (not shown) for automatically setting the movement range of the tire forming presser roller 1 from the former width and limiting it on the former segment.

  As a tire molding presser roller 1 in the pressing device A2, a sponge roller formed only with a sponge roll was used at the beginning.

  However, since the sponge roller is easily deformed, the joint portion cannot be pressed sufficiently, and after pressing with the sponge roller, the operator needs to press again using a manual roller. There was a problem of increasing the burden of.

  Then, the roller as shown in the following FIGS. 5-7 was proposed as a pressing roller for tire shaping | molding which can ensure sufficient pressing force by one press.

  That is, the roller 5 shown in FIG. 5 is a sponge-covered roller constituted by an iron base portion 51 and a sponge roll portion 52 that covers the outside of the iron base portion 51.

  The roller 6 shown in FIG. 6 includes an iron base portion 61, a sponge roll portion 62 that covers the outside of the iron base portion 61, and a nylon (registered trademark) roll portion 63 that covers the outside of the sponge roll portion 62. MC nylon roller (for example, Patent Document 1).

  Further, the roller 7 shown in FIG. 7 is an iron roller in which the outer peripheral surface 71 of the roller is subjected to iris knurl processing.

JP 2011-37113 A

  However, since these rollers have only point contact with the circumferential direction of the former, they are pressed in a line state in the axial direction of the former. Since the entire joint allowance cannot be pressed in this manner, the former of the joint portion is not sufficiently pressed in the circumferential direction, and it is not possible to prevent the occurrence of residual air or separation of the joint. Further, when the pressing force is increased, there is a problem that sagging occurs in the forward direction of the roller and wrinkles occur in the rubber material.

  In view of the above-described problems of the prior art, the present invention eliminates the need for a second pressing operation by a manual roller, thereby reducing the burden on the operator, and causes air remaining in the joint portion and separation of the joint. It is an object of the present invention to provide a pressure roller for forming a tire and a method for pressing the rubber material for forming a tire without causing wrinkles in the rubber material.

The invention described in claim 1
A press roller for molding a tire for pressing and pressure-bonding a joint portion formed by overlapping both end portions of a rubber material wound around a former,
A tire-forming presser roller having a reverse crown shape in which a diameter of a central portion in a roller axial direction is smaller than a diameter of both end portions.

The invention described in claim 2
2. The tire forming press roller according to claim 1, wherein a radius of curvature of the outer peripheral surface in the roller axial direction is formed to be 20 to 60 mm larger than a radius of the former.

The invention according to claim 3
3. The tire forming press roller according to claim 1, wherein the outer peripheral surface is subjected to iris knurl processing.

The invention according to claim 4
Using the press roller for molding a tire according to any one of claims 1 to 3,
For molding a tire, characterized in that the joint portion is pressure-bonded by pressing with a pressing force of 390 to 590 N against a joint portion formed by overlapping both end portions of a rubber material wound around a former This is a method of pressing a rubber material.

  According to the present invention, the pressing operation by the manual roller becomes unnecessary, and the burden on the operator can be reduced, and the air remaining in the joint part and the separation of the joint do not occur, and the rubber material It is possible to provide a pressing roller for tire molding and a method for pressing a rubber material for tire molding without causing wrinkles.

It is a front view of the press roller for tire fabrication concerning a 1st embodiment of the present invention. It is sectional drawing of the press roller for tire shaping | molding which concerns on the 2nd Embodiment of this invention. It is a side view of the press roller for tire fabrication concerning a 2nd embodiment of the present invention. It is a perspective view which shows typically the tire shaping | molding apparatus provided with the press apparatus. It is sectional drawing which shows an example of the conventional pressing roller for tire shaping | molding. It is sectional drawing which shows an example of the conventional pressing roller for tire shaping | molding. It is sectional drawing which shows an example of the conventional pressing roller for tire shaping | molding.

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

1. Tire forming presser roller (first embodiment)
FIG. 1 is a front view of a pressure roller for molding a tire according to the present embodiment. 1 tire molding pressure roller 1, 11 the outer circumferential surface of the tire molding pressure roller 1, r is the radius of curvature of the outer peripheral surface 11 of the tire molding pressure roller 1, W ₁ is a tire molding pressure roller 1 Width , D is the diameter of both ends of the press roller 1 for forming a tire.

  The tire-forming presser roller 1 is formed in an inverted crown shape in which the diameter of the central portion in the roller axial direction is smaller than the diameter D of both ends, and the radius of curvature r in the roller axial direction of the outer peripheral surface 11 is the tire-forming radius. Based on the outer diameter of the former A1 (1st former) in FIG. 4 described above, considering the thickness and width of the joint portion, and so on, as appropriate so that the presser roller 1 and the joint portion of the rubber material are in contact with a sufficient width Although it is set to a large size, it is preferable to set the R shape of the press roller 1 for forming a tire to a value that is 20 to 60 mm larger than the radius of the former A1. It is particularly preferable that it is 40 mm larger than the radius of the former A1.

The width W ₁ of the tire molding pressure roller 1 is set to be larger than the width of the joint portion so as to be sufficiently covered joint portion (circumferential width). Specifically, it is set to be 20 to 70 mm larger than the width of the joint portion.

  The material of the press roller 1 for forming a tire is not particularly limited, but iron, aluminum, MC nylon, and the like are preferable.

(Second Embodiment)
FIG. 2 is a cross-sectional view of a tire forming presser roller according to a second embodiment. FIG. 3 is a side view of the pressing roller for forming a tire shown in FIG.

  As shown in FIGS. 2 and 3, the tire molding presser roller 1 </ b> A according to the second embodiment is subjected to iris knurl processing on the outer peripheral surface 11 of the tire molding presser roller 1 of the first embodiment. It is constituted by.

In FIG. 2, d ₂ is the groove depth of the groove 12 provided in the circumferential direction of the roller, P is the groove pitch of the groove 12, and θ ₁ is the opening angle of the groove 12. As shown in FIG. 2, a plurality of grooves 12 are formed at a predetermined pitch P in the roller axial direction on the outer peripheral surface 11 of the tire molding presser roller 1A.

In FIG. 3, d ₁ is the groove depth of the groove 13 provided in the roller axis direction, θ ₃ is the opening angle of the groove 13, and W ₂ is the width of the upper surface of the groove 13 (the upper end portion of the mountain). As shown in FIG. 3, a plurality of grooves 13 are formed on the outer peripheral surface 11 of the tire molding presser roller 1 at a predetermined angle θ ₂ in the roller circumferential direction.

The groove pitch P is preferably 1 to 3 mm, and particularly preferably 2 mm. And as groove opening angle (theta) ₁ , 45-60 degrees is preferable and 60 degrees is especially preferable. As the groove depth _{d 2,} preferably 1 to 3 mm, 2 mm is particularly preferred.

The number of grooves 13, that is, the number of divisions on the outer periphery is preferably 15 to 50, particularly preferably 30 divisions (angle θ ₂ = 12 °). And as opening angle (theta) ₃ of a groove | channel, 45-90 degrees is preferable and 60 degrees is especially preferable. Further, the width W2 of the upper surface of the groove is preferably 1 to ₂ mm, and particularly preferably 1.16 mm. Further, the groove depth d ₁ is preferably 1 to 8 mm, and particularly preferably 4 mm.

  As described above, by forming the iris knurls having a predetermined pitch, particularly preferably 1.5 mm pitch, on the outer peripheral surface of the tire-forming presser roller, adhesion with the rubber material during pressing is prevented.

2. Pressing Force of Tire Forming Pressing Roller The two-stage forming machine and the pressing device of the present embodiment are the same as FIG. 4 described above except that each tire forming presser roller is used as a tire forming presser roller. It is.

  When the joint portion is pressed with an appropriate pressing force using the tire molding presser roller 1, the joint portion 44 is deformed to bring the outer peripheral surface of the tire molding presser roller 1 into line contact in the width direction of the joint portion 44. And the entire joint allowance can be pressed. In this state, the tire forming presser roller 1 can be pressed over the entire surface of the joint portion 44 by moving in the length direction of the joint portion 44.

  As a result, even if the joint portion 44 is not pressed with an excessive force, the joint portion can be sufficiently pressed to prevent the occurrence of residual air and joint separation. A specific preferable pressing force is 390 to 590 N. In this case, the rubber material is not wrinkled.

  And when the iris knurl processing is given, since the peak part of a iris knurl bites into a joint part, the air remainder can be eliminated more efficiently.

  Moreover, since the pressing operation by the manual type roller becomes unnecessary, the burden on the operator can be reduced.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

1, 1A Tire molding presser roller 5 Roller (sponge-coated roller)
6 Roller (MC nylon roller)
7 Roller (iron roller)
11, 71 Roller outer peripheral surface 12, 13 Groove 43 Rubber material 43a, 43b Both ends of rubber material in the circumferential direction 44 Joint portion 51, 61 Iron base portion 52, 62 Sponge roll portion 63 Nylon roll portion A Two-stage molding machine A1 Former A2 Pressing device A21 Holder A22 Moving body A23 Cylinder D Diameter of both ends of the pressure roller for tire molding W ₁ Width of the pressure roller for molding the tire W Width of the upper surface of the groove ₂ d ₁ , d ₂ Groove depth P Groove pitch r Tire molding Radius of curvature of outer peripheral surface of presser roller for rotation θ ₁ , θ ₃ Groove opening angle θ ₂ Dividing angle of outer periphery

Claims (4)

A press roller for molding a tire for pressing and pressure-bonding a joint portion formed by overlapping both end portions of a rubber material wound around a former,
A tire forming presser roller, wherein a diameter of a central portion in a roller axial direction is formed in an inverted crown shape smaller than a diameter of both end portions.   2. The tire molding presser roller according to claim 1, wherein a radius of curvature of the outer peripheral surface in the roller axial direction is formed to be 20 to 60 mm larger than a radius of the former.   The tire forming press roller according to claim 1 or 2, wherein the outer peripheral surface is subjected to iris knurl processing. Using the press roller for molding a tire according to any one of claims 1 to 3,
For molding a tire, characterized in that the joint portion is pressure-bonded by pressing with a pressing force of 390 to 590 N against a joint portion formed by overlapping both end portions of a rubber material wound around a former Method of pressing rubber material.

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