JP2018079571A - Molding device of rubber member for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding device of a rubber member for a tire in which adhesion to an upper press belt of a rubber strip can be prevented, the rubber strip is supplied to an intended position on a molding drum with high accuracy, and degree of dispersion of sticking pitches can be reduced even when force in a lateral direction is applied.SOLUTION: In a molding device of a rubber member for a tire in which a belt-shaped rubber strip is spirally wound on a molding drum and attached to form the rubber member for the tire by supplying the belt-shaped rubber strip through an applicator, the applicator includes an applicator belt for transporting the rubber strip toward the molding drum and an upper press belt disposed facing the applicator belt and for pressing the rubber strip to the applicator belt. In the molding device of the rubber member for the tire, a smooth surface having a lateral stripe perpendicular to a rotation direction of the upper press belt on the outer peripheral surface of the upper press belt is formed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tire rubber member molding apparatus for molding a tire rubber member by supplying a belt-shaped rubber strip to a molding drum and winding it in a spiral shape.

  In the manufacturing process of a pneumatic tire, a strip wind method is widely used in which a rubber member for a tire is formed by spirally winding and adhering a belt-shaped rubber strip around a forming drum.

  In this strip winding method, when the belt-shaped rubber strip is supplied to the forming drum via the applicator, the applicator is moved while being moved along the axial direction of the forming drum so that it is wound spirally on the forming drum. Turn and paste.

  Specifically, the applicator includes an applicator belt that conveys the rubber strip and a pair of upper and lower belts of an upper presser belt that presses the conveyed rubber strip against the applicator belt, and the rubber strip is sandwiched between the pair of upper and lower belts. Is sent out toward the forming drum (for example, Patent Document 1).

  At this time, in general, a transport belt using a resin or hand-woven cloth as a belt is used for the pair of upper and lower belts.

JP, 2015-71261, A

  However, in the case of the conventional applicator, if the adhesive strength of the rubber strip increases, the rubber strip adheres to the upper presser belt and does not peel off from the applicator, causing the rubber strip to be entangled and causing the line to pause. There is a risk of lowering.

  Therefore, in order to prevent the occurrence of such problems, conventionally, as an upper presser belt, a belt whose adhesion to the rubber strip is suppressed, or the force to sandwich the rubber strip is reduced, Prevents the rubber strip from sticking to the upper presser belt.

  However, even if any upper presser belt is used, the rubber strip can be prevented from sticking to the upper presser belt, but the rubber strip is hardly restrained by the upper presser belt. If a lateral force is applied by an applicator that moves laterally upward, a rubber strip may be applied at a position different from the target position, resulting in a problem that the application pitch varies greatly.

  Therefore, the present invention prevents the rubber strip from adhering to the upper presser belt when the rubber strip is supplied to the forming drum by the applicator, and is accurate to the target position of the forming drum even when a lateral force is applied. It is an object of the present invention to provide a molding apparatus for a rubber member for a tire, which can supply a rubber strip high and reduce the degree of variation in affixing pitch.

  As a result of intensive studies to solve the above problems, the present inventor has found that the above problems can be solved by the invention described below, and has completed the present invention.

The invention described in claim 1
A tire rubber member molding apparatus for molding a rubber member for a tire by spirally winding and adhering a belt-like rubber strip on a molding drum by supplying it through an applicator,
The applicator is
An applicator belt for conveying the rubber strip toward the molding drum;
An upper presser belt disposed opposite to the applicator belt and pressing the rubber strip against the applicator belt;
2. A tire rubber member molding apparatus according to claim 1, wherein a smooth surface having horizontal stripes perpendicular to the rotational direction of the upper presser belt is formed on the outer peripheral surface of the upper presser belt.

The invention described in claim 2
2. The tire rubber member molding apparatus according to claim 1, wherein the length and interval of the smooth surfaces of the horizontal stripes in the rotation direction of the upper presser belt are constant.

The invention according to claim 3
3. The tire rubber member molding apparatus according to claim 1, wherein a surface roughness Ra of the smooth surface of the horizontal stripes is 0.2 μm or less. 4.

The invention according to claim 4
The tire rubber member molding apparatus according to any one of claims 1 to 3, wherein a surface roughness Ra of the non-smooth portion of the horizontal stripes is 0.5 to 1.0 µm. It is.

The invention described in claim 5
The tire rubber according to any one of claims 1 to 4, wherein a ratio of the smooth surface of the horizontal stripes to a length of the upper presser belt is 30 to 50%. It is a molding apparatus of a member.

  According to the present invention, when the rubber strip is supplied to the forming drum by the applicator, the rubber strip is prevented from coming into close contact with the upper presser belt, and even when a lateral force is applied, the target position of the forming drum is accurately adjusted. It is possible to provide a molding apparatus for a rubber member for a tire that can supply a high rubber strip to reduce the degree of variation in the attaching pitch.

It is a side view which shows typically the shaping | molding apparatus of the rubber member for tires which concerns on one embodiment of this invention. It is a top view explaining the example of the smooth surface of the horizontal stripe formed in the outer peripheral surface of the upper pressing belt of the shaping | molding apparatus of the rubber member for tires which concerns on one embodiment of this invention. It is a top view which shows the outer peripheral surface of the conventional upper presser belt.

  Hereinafter, a tire rubber member molding apparatus according to an embodiment of the present invention will be specifically described with reference to the drawings.

1. Basic Configuration of Tire Rubber Member Molding Device FIG. 1 is a side view schematically showing a tire rubber member molding device according to the present embodiment. As shown in FIG. 1, the tire rubber member molding apparatus 1 according to the present embodiment is basically the same as the conventional tire rubber member molding apparatus, and includes an applicator 10, a molding drum 5, and the like. It has. The applicator 10 can be moved laterally along the axial direction of the forming drum 5.

  The applicator 10 includes an applicator belt 12 that conveys the rubber strip G toward the molding drum 5, and an upper presser belt 14 that presses the rubber strip G against the applicator belt 12.

  The applicator belt 12 is stretched around a driving roller 20, driven rollers 21 to 23, and a tension roller 24. The belt support member 28 disposed between the driven roller 22 and the driven roller 23 is disposed so as to face the inner peripheral surface of the applicator belt 12 with a slight separation. The applicator belt 12 conveys the rubber strip G placed on the belt toward the molding drum 5 by rotating the driving roller 20 by a driving mechanism (not shown).

  The upper presser belt 14 is stretched around the driven rollers 25 to 27 and is disposed to face the applicator belt 12. The upper presser belt 14 restrains the rubber strip G to be conveyed on the applicator belt 12 by pressing the rubber strip G being conveyed on the applicator belt 12.

2. Features of Tire Rubber Member Molding Apparatus According to the Present Embodiment As described above, the tire rubber member molding apparatus according to the present embodiment has the same basic structure as the conventional structure, but the upper presser belt. A characteristic feature of the present invention is that a smooth surface of horizontal stripes is formed on the outer peripheral surface of the film.

  FIG. 2 is a plan view for explaining an example of a smooth surface of horizontal stripes formed on the outer peripheral surface of the upper presser belt of the tire rubber member molding apparatus according to the present embodiment, and FIG. 3 is a conventional upper presser belt. It is a top view which shows the outer peripheral surface.

  That is, in the present embodiment, as shown in FIGS. 2A to 2C, horizontal stripes perpendicular to the rotation direction of the upper presser belt 14 (see FIG. 1) are formed on the outer peripheral surface of the upper presser belt 14. The smooth surface 33 is formed. The length and interval of the horizontal surface of the horizontal stripes in the rotation direction of the upper presser belt can be determined as appropriate. However, the length and interval of the smooth surface of the horizontal stripe are preferably constant.

  2A to 2C, reference numeral 32 denotes a joint portion formed when the upper presser belt 14 is manufactured, and the surface is processed to be smooth. In the upper presser belt 14, a rough surface 34 is formed on portions other than the horizontal stripe smooth surface 33 and the joint portion 32.

  Here, the smoothness of the smooth surface is smooth enough to allow the transported rubber strip to be in close contact with each other, and the roughness of the rough surface suppresses the close contact of the transported rubber strip. Rough enough to be able to.

  Since the conventional upper presser belt 14 shown in FIG. 3 is formed only by the rough surface 34, the rubber strip being conveyed cannot be sufficiently restrained, and the degree of variation in the sticking pitch during the conveyance of the rubber strip can be reduced. A large step of the rubber strip was formed in the molded rubber member, and as a result, a streaky inner appearance defect occurred.

  On the other hand, in the present embodiment, as described above, the horizontal stripe smooth surface 33 is formed on the outer peripheral surface of the upper presser belt 14, and the smooth surface 33 and the rough surface 34 are alternately formed. As a result, the rubber strip that has been transported on the smooth surface 33 is sufficiently restrained and transported to the tip of the applicator without causing a positional shift. On the other hand, since the close contact of the rubber strip that has been conveyed is suppressed on the rough surface 34, it is possible to sufficiently suppress the rubber strip from being wound around the upper presser belt 14 generated at the tip of the applicator.

  In the present embodiment, since the smooth surface to which the rubber strip is in close contact is formed in a horizontal stripe, it can be in close contact with the upper presser belt over the entire width of the rubber strip and counter the force in the lateral direction.

  In the present embodiment, the above-described effects are combined, and the rubber strip is supplied with high precision toward the target position of the forming drum without causing the rubber strip to be caught from the upper presser belt 14. Can do. As a result, it becomes possible to improve the accuracy of attaching the rubber strip to the molding drum, to reduce the degree of variation in the attaching pitch, and to suppress the occurrence of a large step in the rubber strip at the time of attaching, Generation | occurrence | production of the stripe-shaped internal appearance defect in the shape | molded raw cover can be suppressed.

  And the improvement of the sticking accuracy can increase the speed of the molding operation of the rubber strip, so that the productivity can be improved.

  In the present embodiment, the surface roughness Ra of the smooth surface 33 is preferably 0.2 μm or less. When the surface roughness Ra exceeds 0.2 μm, it becomes difficult to restrain the position of the rubber strip with the upper presser belt.

  On the other hand, the surface roughness Ra of the rough surface 34 is preferably 0.5 to 1.0 μm. When the surface roughness Ra is less than 0.5 μm, the rubber strip is easily wound around the upper presser belt, and when the surface roughness Ra exceeds 1.0 μm, it is difficult to restrain the position of the rubber strip with the upper presser belt.

  The ratio of the horizontal striped smooth surface 33 to the length of the upper presser belt 14 is preferably 30 to 50%. When the ratio of the horizontal surface 33 of the horizontal stripes is less than 30%, the adhesion between the rubber strip G and the upper presser belt 14 becomes too weak, and the variation in the position where the rubber strip is attached increases. On the other hand, when the ratio of the horizontal striped smooth surface 33 exceeds 50%, the adhesion between the rubber strip G and the upper presser belt 14 becomes too strong, and the rubber strip G is easily caught in the upper presser belt 14.

  In the present embodiment, an ironing method is preferably employed as a method for processing the outer peripheral surface of the upper presser belt 14 described above. As a specific ironing method, the surface roughness Ra of the portion subjected to the press treatment is reduced by applying a high-temperature plane press treatment to the portion where the horizontal stripes of the upper presser belt 14 are to be provided. A method of making a difference in the surface roughness Ra of the outer peripheral surface of the presser belt 14 can be mentioned. Further, the surface roughness Ra of the portion subjected to the press treatment is performed by applying a press treatment with a high-temperature roll subjected to a knurling treatment to a place where the rough surface 34 of the upper presser belt 14 smoothed in advance is to be provided. It is also possible to employ a method in which the difference in the surface roughness Ra of the outer peripheral surface of the upper presser belt 14 is increased by increasing

  Hereinafter, the present invention will be described based on examples.

1. Examples 1-5
In the example, in the molding apparatus according to the embodiment of the present invention shown in FIG. 1, the ratio of the horizontal stripe-shaped smooth surface 33 (surface roughness Ra: 0.20 μm) to the length of the upper presser belt 14 in FIG. However, using the upper presser belt 14 changed into five types of 10%, 30%, 50%, 70%, and 90%, using the applicator 10 that moves in the lateral direction with respect to the forming drum 5 at a constant speed. The rubber strip G was wound around the molding drum 5 and attached. At this time, the distance (pitch) from the reference line to the center line of the rubber strip wound around the forming drum was 13.4 mm as a reference. And surface roughness Ra in the rough surface 34 was 0.50 micrometer.

2. Comparative Example In the comparative example, the rubber strip G was wound around and bonded to the molding drum 5 under the same conditions as in the example except that the conventional upper presser belt 14 shown in FIG. 3 was used.

3. Evaluation and Results (1) Pitch Variation In each example and comparative example, the distance (pitch) from the reference line to the center line of the rubber strip that is wound around the forming drum is measured, and the variation with respect to the reference pitch is measured. Sought and evaluated.

(2) Presence or absence of occurrence of sticking trouble In addition, when sticking to the forming drum, check if there is sticking trouble that cannot be attached to the forming drum because the rubber strip adheres to the upper presser belt and does not peel off from the applicator. It was measured.

(3) Results The results are shown in Table 1.

  From Table 1, by forming a smooth surface of horizontal stripes on the upper presser belt (Examples 1 to 5), the variation in pitch is smaller than that of the comparative example, and the accuracy of attaching the rubber strip to the molding drum is improved. It can be seen that it has improved.

  However, in Example 4 and Example 5, there is a problem of sticking, and if the ratio of the horizontal surface of the horizontal stripes becomes too large, the rubber strip can be satisfactorily applied to the forming drum even if the pitch variation becomes small. It turns out that it becomes impossible to paste.

  Moreover, in Example 2 and Example 3, when the surface roughness Ra of the smooth surface of the horizontal stripes exceeds 0.2 μm, the pitch variation is 0.8 or more, and the pitch variation is larger than that in Table 1. It was confirmed. And in Example 2 and Example 3, when surface roughness Ra of the part which is not a smooth surface of a horizontal stripe was less than 0.5, it was confirmed that a sticking trouble generate | occur | produces a little. In addition, when the surface roughness Ra of the non-smooth portion of the horizontal stripes exceeded 1.0 μm, it was confirmed that the pitch variation was 0.8 or more, and the pitch variation was larger than that in Table 1.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to said embodiment. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Molding apparatus of rubber member for tire 5 Molding drum 10 Applicator 12 Applicator belt 14 Upper presser belt 20 Drive roller 21, 22, 23 (Applicator belt) driven roller 24 Tension roller 25, 26, 27 (Upper presser belt) driven Roller 28 Belt support member 32 Joint part 33 (Horizontal stripe) smooth surface 34 Rough surface G Rubber strip

Claims (5)

A tire rubber member molding apparatus for molding a rubber member for a tire by spirally winding and adhering a belt-like rubber strip on a molding drum by supplying it through an applicator,
The applicator is
An applicator belt for conveying the rubber strip toward the molding drum;
An upper presser belt disposed opposite to the applicator belt and pressing the rubber strip against the applicator belt;
An apparatus for molding a rubber member for a tire, wherein a smooth surface having horizontal stripes perpendicular to a rotation direction of the upper presser belt is formed on an outer peripheral surface of the upper presser belt.   The apparatus for molding a rubber member for tire according to claim 1, wherein the length and interval of the smooth surface of the horizontal stripes in the rotation direction of the upper presser belt are constant.   3. The tire rubber member molding apparatus according to claim 1, wherein a surface roughness Ra of the smooth surface of the horizontal stripes is 0.2 μm or less.   The tire rubber member molding apparatus according to any one of claims 1 to 3, wherein a surface roughness Ra of the non-smooth portion of the horizontal stripes is 0.5 to 1.0 µm. .   The tire rubber according to any one of claims 1 to 4, wherein a ratio of the smooth surface of the horizontal stripes to a length of the upper presser belt is 30 to 50%. Member forming device.

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