JP2005081617A - Tire vulcanizing/molding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire vulcanizing/molding apparatus constituted so as to prevent the relative shift in the axial direction of a tire between the sectors of a sectional tire vulcanizing/molding apparatus to enhance the uniformity and appearance of the tire after vulcanization/molding. <P>SOLUTION: In the sectional tire vulcanizing/molding apparatus composed of a pair of upper and lower side plates 13 and 14 for molding both side wall parts of the tire and a plurality of the sectors 12, which are divided in the peripheral direction C of the tire, for integrally molding a tread part and both shoulder parts, locking mechanisms 15a and 15b for restricting the relative shift in the axial direction Z of the tire are provided to the mutual contact surfaces of the adjacent sectors. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tire vulcanization molding apparatus, and more particularly to a tire vulcanization molding apparatus that can prevent the occurrence of relative deviation in the tire axial direction between adjacent sectors and can prevent errors in the arrangement order of sectors. It is.

  Among conventional tire vulcanization molding apparatuses, a so-called sectional type molding apparatus includes a pair of upper and lower side plates 13 and 14 for molding both sidewall portions, a tread portion and both shoulder portions, as shown in FIGS. A mold is constituted by a plurality of sectors 12 that are divided into a plurality of pieces in the tire circumferential direction for integrally molding (see, for example, Patent Document 1).

  These mold parts 12, 13, and 14 are assembled in the container 10 with the sector 12 held in the segment 11, and the mold is shown in FIGS. 8 and 10 by lowering the container 10. The tire is vulcanized and molded from the open state to the closed state shown in FIGS. 9 and 11, and after molding, the tire is returned to the state shown in FIGS. 8 and 10 and the molded tire is taken out.

However, in the sectional vulcanization molding apparatus, as shown in FIGS. 14 and 15, a relative deviation G may occur in the tire axial direction Z between adjacent sectors 12. Such a relative deviation in the tire axial direction Z not only affects the uniformity of the tire after vulcanization molding, but also a step in the tire axial direction Z is formed in the groove formed in the tire circumferential direction C on the tread surface. This causes a problem of lowering the commercial value by deteriorating the appearance.
Japanese Patent Laid-Open No. 7-314459 (2nd page, FIG. 14 (b))

  An object of the present invention is to provide a tire vulcanization molding apparatus that prevents relative deviation in the tire axial direction between sectors of a sectional vulcanization molding apparatus and can improve the uniformity and appearance of a tire after vulcanization molding. There is to do.

  The tire vulcanization molding apparatus for achieving the above object is divided into a plurality of tire circumferential directions in which a pair of upper and lower side plates for molding both sidewall portions of the tire and a tread portion and both shoulder portions are integrally molded. In the sectional type tire vulcanizing and molding apparatus including the sectors, a locking mechanism for restraining a relative deviation in the tire axial direction is provided on the mutual contact surfaces of the adjacent sectors. With this configuration, it is possible to prevent the occurrence of relative deviation in the tire axial direction between adjacent sectors when the mold is closed.

  The locking mechanism is preferably configured by providing a concave portion on one of the contact surfaces of adjacent sectors and a convex portion that fits the concave portion on the other.

  In addition, if one of the positions, number, and shape of the projections and depressions formed on the mutual contact surfaces is made different for each contact surface between sectors, multiple sectors are arranged in the tire circumferential direction. If the arrangement order is not correct, the convex portions and the concave portions cannot be fitted together, and sector misalignment can be prevented.

  Furthermore, it is preferable that the locking mechanism is configured so as to allow a displacement with respect to the tire radial direction. With this configuration, the opening / closing operation of the sector can be performed more smoothly.

  In addition, the holding mechanism for the sector segment may be configured to provide a play that allows movement in the tire axial direction between the sector and the segment that holds the sector. The deviation in the tire axial direction can be adjusted with higher accuracy by the mechanism.

  According to the tire vulcanization molding apparatus of the present invention, since the locking mechanism for restraining the relative displacement in the tire axial direction is provided between the contact surfaces of the adjacent sectors, when the mold is closed, between the adjacent sectors Therefore, the tire uniformity after the vulcanization molding and the appearance of the tire tread portion can be maintained in a good state.

  In addition, if any one or a combination of the positions and number of protrusions and recesses in the locking mechanism is made different for each contact surface between sectors, an error occurs in the arrangement order of sectors in the tire circumferential direction. Can not be.

  Hereinafter, the tire vulcanization molding apparatus of the present invention will be described with reference to the embodiments shown in the drawings.

  As shown in FIGS. 8 to 11, this tire vulcanization molding apparatus is divided into a plurality of (for example, eight) tire circumferential directions C in which a tread portion and both shoulder portions are integrally molded in a container 10. The sector 12 is incorporated via the segment 11 and arranged on the circumference, and a pair of upper mold side plate 13 and lower mold side plate 14 for forming the sidewall portion are arranged vertically.

  The container 10 is hung by the outer peripheral edge of the elevating frame 10a and the lower surface thereof, and supports the outer ring 10b having a tapered surface whose diameter is expanded downward on the inner peripheral side, and the upper mold side plate 13 to elevate and lower. The upper plate 10c and the lower plate 10d supporting the lower mold side plate 14 are configured.

  The sector 12 is supported by a segment 11 having a tapered surface that expands downward on the outer peripheral side, and this segment 11 is connected to the inner side of the outer ring 10b through a dovetail fitting. When the outer ring 10b is lowered from the state of FIG. 8 to the state of FIG. 9, the taper surface that is the inner peripheral surface of the outer ring 10b presses the taper surface that is the outer peripheral surface of the segment 11 while descending. 11 is moved inward. By this movement, the segment 11 and the sector 12 shift from the open state of FIG. 10 to the closed state of FIG. 11, and the sector 12 is arranged adjacently, and the tread portion and both shoulder portions of the tire are integrally formed. Become a mold.

  In the molding apparatus of the present invention, as shown in FIGS. 1 to 5, when the locking devices 15a and 15b are provided on the mutual contact surfaces 15 and 15 of the sectors 12 and 12, and the mold is closed, they are adjacent to each other. A relative shift in the tire axial direction Z between the matching sectors 12 and 12 is prevented.

  The locking device 15 includes a concave portion 15a formed on one contact surface 15 of the sector 12 and a convex portion 15a formed on the other contact surface 15 with a kingpin or the like, and the concave portion 15a and the convex portion 15a are formed. When fitted, play (backlash) is not generated in the tire axial direction Z.

  The concave portion 15a is formed by recessing the contact surface 15 of the sector 12 by molding or processing. However, the convex portion 15b may be formed integrally with the sector 12, or a kingpin formed separately from the sector 12. Etc. may be separately attached.

  When the mold is closed, one concave portion 15a of the contact surface 15 between the adjacent sectors 12 and 12 and the other convex portion 15b are fitted to each other, so that the sector mold is closed. The relative deviation in the tire axial direction Z between adjacent sectors 12 and 12 is restrained. The tire radial direction R is formed so as to allow a slight deviation so that the mold can be opened and closed smoothly.

  Then, either the installation position or the installation number of the concave portions 15a and the convex portions 15b or a combination thereof is configured to be different for each of the contact surfaces 15 and 15 between the sectors 12 and 12. That is, as shown in FIG. 6, the installation positions of the concave portions 15 a and the corresponding convex portions 15 b are shifted in the tire axial direction Z, and this deviation amount H differs for each contact surface 15, 15 of the sector 12. Value. Or as shown in FIG. 7, it forms by increasing the installation number of the recessed part 15a and the convex part 15b corresponding to this. Alternatively, it is formed by changing the shape of the concave portion 15a and the convex portion 15b. Further, if necessary, the change in the installation position, the change in the number of installations, and the change in shape are combined so that the contact surfaces of the sectors 12 and 12 are different. That is, the concave portion 15a and the convex portion 15b can be fitted only when the sectors are in the correct arrangement order in the tire circumferential direction C.

  With this configuration, when the adjacent sectors 12 and 12 are not in a correct combination, that is, when the arrangement order of the sectors 12 is not correct, the concave portions 15a and the convex portions 15b cannot be fitted. It is possible to prevent mistakes in the arrangement order.

  In addition, a notch 16 is provided outside the contact surface 15 of the sector 12 so that air that escapes from the gap between the contact surfaces 15 and 15 when the mold is closed is between the contact surfaces of the segments 11. It is easy to leak into the gap S generated.

  Further, the surface 17 (FIGS. 3 and 5) facing and in contact with the segment 11 above and below the sector 12 (the tire axial direction Z) is a gap between the sector 12 and the sector 12 so that the mold can be smoothly opened and closed. T is formed so as to generate play, and when the sector 12 is joined to the segment 11 with a bolt, it is not completely fixed in the tire axial direction Z but is given a little play (backlash) and held. That is, it is configured to provide a play that allows movement in the tire axial direction Z between the sector 12 and the segment 11 that holds the sector 12.

  In the tire vulcanization molding apparatus having this configuration, an unvulcanized tire (green tire) is vulcanized and molded as follows.

  First, when an unvulcanized tire and a vulcanizing chamber are inserted and the lifting frame 10a of the container 10 is lowered while the mold shown in FIGS. 8 and 10 is opened, the segment 11 is moved while the outer ring 10b is lowered. The taper surface is pressed to move the segment 11 and the sector 12 inward. By this movement, the concave portions 15a and the convex portions 15 of the adjacent sectors 12 are fitted to each other, and the sectors 12 are arranged adjacent to each other while adjusting the relative displacement in the tire axial direction Z to zero. It becomes an annular shape that integrally molds the parts.

  The annular sector 12 abuts on the upper mold side plate 13 and the lower mold side plate 14 to form a tire vulcanization molding space A. In the tire vulcanization molding space A, a high temperature and a high pressure are supplied from the vulcanization chamber. The vulcanized gas is supplied to press the unvulcanized tire against the mold, and the tire is vulcanized and molded.

  After the tire molding, when the elevating frame 10a of the container 10 is raised, the outer ring 10b and the segment 11 are joined via the dovetail fitting, so the segment 11 and the sector 12 move outward, and FIG. The mold shown in FIG. 10 is opened. In this open state, the molded tire is taken out, the vulcanization and molding process of this tire is completed, and the process proceeds to the next vulcanization and molding process of the tire.

  According to the tire vulcanization molding apparatus of the present invention, since the locking mechanisms 15a and 15b for preventing the relative displacement in the tire axial direction Z are provided, the tire shaft between the adjacent sectors 12 when the mold is closed. It is possible to prevent the occurrence of a deviation in the direction Z and to prevent a step between the sectors 12. Therefore, the uniformity of the tire after vulcanization molding and the appearance of the tire tread portion can be maintained in a good state.

  In addition, in the locking mechanism, if any one of the installation position, the number of installations, and the shape of the concave portions 15a and the convex portions 15b or a combination thereof is made different for each contact surface between the sectors, the tire circumferential direction C of the sector 12 is determined. It is possible to prevent mistakes in the arrangement order.

  Further, when the sector 12 is held in the segment 11, if the play in the tire axial direction Z is allowed between the sector 12 and the segment 11, the deviation in the tire axial direction Z between the adjacent sectors 12, 12 is achieved. Adjustment can be performed with higher accuracy.

It is a plane sectional view showing the composition of the sector of the tire vulcanization molding device of an embodiment of the invention. It is a perspective view which shows the recessed part of the sector and the latching mechanism in the tire vulcanization molding apparatus of embodiment of this invention. It is a figure which shows the contact surface of the sector of FIG. It is a perspective view which shows the convex part of the sector and latching mechanism in the tire vulcanization molding apparatus of embodiment of this invention. It is a figure which shows the contact surface of the sector of FIG. It is a figure which shows the contact surface of the sector which changed the installation position of the recessed part of a latching mechanism. It is a figure which shows the contact surface of the sector which changed the installation number of the recessed part of a latching mechanism. It is a sectional side view of the half on one side showing the configuration of the tire vulcanization molding apparatus, and shows the open state of the mold. It is a sectional side view of one half showing the composition of a tire vulcanization molding device, and is a figure showing the closed state of a metallic mold. It is a plane sectional view which shows the open state of a metal mold | die. It is a plane sectional view which shows the closed state of a metal mold | die. It is a perspective view which shows the normal positional relationship of the adjacent sector in the closed state of a metal mold | die. It is the figure seen from the tire radial direction which shows the normal positional relationship of the adjacent sector in the closed state of a metal mold | die. It is a perspective view which shows the positional relationship which the adjacent sector in the closed state of a metal mold | die shifted in the tire axial direction. It is the figure seen from the tire radial direction which shows the positional relationship which the adjacent sector in the closed state of a metal mold | die shifted in the tire axial direction.

Explanation of symbols

10 Container 11 Segment 12 Sector 13 Upper mold side plate 14 Lower mold side plate 15 Sector contact surface 15a Recess (locking mechanism)
15b Convex part (locking mechanism)

Claims (5)

  In a sectional type tire vulcanization molding apparatus comprising a pair of upper and lower side plates for molding both sidewall portions of a tire, and a sector divided into a plurality of tire circumferential directions integrally molding a tread portion and both shoulder portions, A tire vulcanization molding apparatus provided with a locking mechanism for restraining relative displacement in the tire axial direction on the contact surfaces of the adjacent sectors.   2. The tire vulcanization molding apparatus according to claim 1, wherein the locking mechanism is configured such that a concave portion is provided on one of the mutual contact surfaces of the adjacent sectors, and a convex portion that is fitted in the concave portion is provided on the other.   The tire vulcanization molding apparatus according to claim 2, wherein any one of an installation position, an installation number, and a shape of the convex portions and the concave portions or a combination thereof is made different for each contact surface between the sectors.   The tire vulcanization molding apparatus according to any one of claims 1 to 3, wherein the locking mechanism is configured to allow displacement with respect to a tire radial direction. The tire vulcanization molding apparatus according to any one of claims 1 to 4, wherein a play that allows movement in a tire axial direction is provided between the sector and a segment that holds the sector.

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