JP2016179641A - Method and apparatus for preheating tire vulcanizing mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preheating a tire vulcanizing mold capable of efficiently preheating a tire vulcanizing mold by suppressing energy consumption.SOLUTION: In a state where a tire vulcanizing container 1, which comprises a segment 3 which is attached to the outer peripheral surface of a plurality of respective selector molds 9 annularly arranged, a lifting and lowering plate 4 to which an upper side mold 10a is attached, a bottom plate 5 to which a lower side mold 10b is attached and a container ring 2 which vertically moves, is not installed on a vulcanizer, an outside surface of the tire vulcanizing container 1 is heated by a heating body 7 while a heated gas F supplied through an injection pipe 6a is blown toward a tire-molding surface S of at least the selector molds 9 of the closed molds 9, 10a and 10b.SELECTED DRAWING: Figure 3

Description

  TECHNICAL FIELD The present invention relates to a tire vulcanization mold preheating method and apparatus, and more particularly, a tire vulcanization mold preheating method and apparatus that can efficiently preheat a tire vulcanization mold while suppressing energy consumption. It is about.

  In the tire manufacturing process, green tires are successively vulcanized. When tires having different specifications (shape, size, etc.) are vulcanized by the same vulcanizer, the tire vulcanization mold installed in the vulcanizer is replaced with a different tire vulcanization mold. When the mold is replaced in this way, the vulcanization of the green tire cannot be started unless the mold is at a certain high temperature. Therefore, a time loss occurs in the process until the predetermined temperature is reached.

  In order to reduce the time loss of such a process, the mold is preheated. In the conventional mold preheating method, for example, the outer peripheral surface of a vulcanizing container to which a mold is attached is heated by a hot plate. The region where the temperature is actually desired to be increased is the tire molding surface of the mold (tire molding surface), but the heat supplied from the hot plate is radiated from the tire molding surface of the mold, so the tire molding surface is heated to a predetermined temperature. There is a problem that it takes more time than necessary. In other words, useless energy is consumed for preheating the mold.

  Another method for preheating the mold is to supply a heating fluid to the vulcanizing bladder disposed inside the mold while heating the outer peripheral surface of the vulcanizing container attached with the mold with a hot plate. There has been proposed a method of heating from the tire molding surface side of the mold in a state where it is not brought into contact with the tire molding surface of the mold (see Patent Document 1). In this method, the hot plate and the vulcanizing bladder serve as a heat source, and the heat from the heating fluid is radiated toward the tire molding surface of the mold through the vulcanizing bladder. That is, a large amount of energy is required because the heat of the heating fluid is consumed for heating the vulcanizing bladder. And since the heat | fever of a heating fluid is used for the preheating of a mold through the vulcanizing bladder, there exists a problem that heat conduction efficiency is bad. In addition, this method has a problem that preheating cannot be performed unless a vulcanizing bladder is installed inside the mold.

JP 2009-90501 A

  An object of the present invention is to provide a tire vulcanization mold preheating method and apparatus that can efficiently preheat a tire vulcanization mold while suppressing energy consumption.

  In order to achieve the above object, a method for preheating a tire vulcanization mold according to the present invention includes a tire vulcanization mold attached to a tire vulcanization container, and the tire vulcanization container provided with a vulcanization bladder. A preheating method for a tire vulcanization mold that preheats the mold in a state where the mold is not installed in a sulfur machine, and at least a tire molding surface formed on the mold toward a tire molding surface on which a tire tread is molded While heating gas is sprayed, the outer surface of the said container for tire vulcanization is heated.

  The tire vulcanization mold preheating apparatus of the present invention includes a tire vulcanization container in which the tire vulcanization mold is attached, and is used in a state where the tire vulcanization container is not installed in a vulcanizer. A tire vulcanization mold preheating apparatus for spraying at least a tire molding surface for molding a tire tread out of tire molding surfaces formed in the mold attached to the inside of the tire vulcanization container It has the injection pipe which supplies heated gas, and the heating body attached to the outer side of the said container for tire vulcanization, It is characterized by the above-mentioned.

  According to the present invention, since the heated gas is blown toward at least the tire molding surface for molding the tire tread among the tire molding surfaces formed in the mold, the temperature of the tire molding surface on which the heated gas is sprayed rises. Therefore, even if the heat supplied from the outer surface of the vulcanizing container dissipates from the tire molding surface of the mold, the heat dissipation amount can be suppressed. Therefore, it is advantageous for raising the temperature of the molding surface of the mold in a short time.

  In addition, since the heated gas is directly blown toward the tire molding surface, the heat of the heating gas can be effectively used for suppressing heat radiation from the tire molding surface and heating the tire molding surface. Therefore, energy consumption can be suppressed and the tire molding surface of the mold can be efficiently preheated. Along with this, time loss in the vulcanization process can be reduced, which contributes to improvement in tire productivity.

  Here, for example, an inert gas is used as the heating gas. If an inert gas such as nitrogen gas is used, it is possible to avoid the occurrence of rust in the mold as compared with the case where air is simply used.

  A seal member may be arranged at a position covering the tire molding surface formed on the mold with a gap between the tire molding surface and the heated gas may be accommodated in the gap. In this case, since the heated gas can be retained between the gaps, the heat of the heated gas can be used for preheating over a long period of time. Therefore, it becomes more and more advantageous for suppressing energy consumption.

  After the heated gas accommodated in the gap is recovered, it can be heated and refluxed in the gap. In this case, since the heat of the heated gas can be effectively used without wasting it, it becomes more and more advantageous for suppressing energy consumption.

It is explanatory drawing which illustrates the preheating apparatus of the mold for tire vulcanization | cure of this invention by a longitudinal cross-sectional view. It is explanatory drawing which illustrates the injection tube, sector mold, and segment of FIG. 1 by planar view. It is explanatory drawing which illustrates the preheating apparatus of FIG. 1 by the right half longitudinal cross-sectional view. It is explanatory drawing which illustrates another embodiment of a preheating apparatus by a right half longitudinal cross-sectional view. It is explanatory drawing which illustrates another embodiment of a preheating apparatus by right half longitudinal cross-sectional view. It is a graph which shows the temperature change of the tire molding surface by the difference in the temperature of heating gas. It is a graph which shows the preheating required time by a difference in the temperature of heating gas.

  Hereinafter, the tire vulcanization mold preheating method and the preheating apparatus of the present invention will be described based on the embodiment shown in the drawings, taking as an example the case of preheating a sectional type mold.

  A tire vulcanization mold preheating apparatus (hereinafter referred to as a preheating apparatus) of the present invention illustrated in FIG. 1 includes a tire vulcanization container 1 (hereinafter referred to as a container 1) and a heating body 7 attached to the outside of the container 1. And an injection pipe 6 a for injecting the heated gas F into the container 1. This preheating device is used in a state where the container 1 is not installed in the vulcanizer.

  Inside the container 1, a sectional type tire vulcanization mold 8 (hereinafter referred to as a mold 8) is attached. As illustrated in FIG. 2, the mold 8 includes a plurality of (for example, about eight) sector molds 9 that are annularly arranged to mold a tire tread, and an annular upper side mold 10 a that molds a tire sidewall. It is comprised with the lower side mold 10b. A tire molding surface S is formed on the inner surface of each mold 8. A one-dot chain line in the figure indicates an annular center line CL of the sector mold 9 arranged in an annular shape.

  The container 1 includes a segment 3 attached to the outer peripheral surface of each sector mold 9, a lift plate 4 to which the upper side mold 10a is attached, a bottom plate 5 to which the lower side mold 10b is attached, and a container ring 2 that moves up and down. And. The elevating plate 4 and the container ring 2 are moved up and down independently by a hydraulic cylinder or the like. The outer peripheral surface of the segment 3 and the inner peripheral surface of the container ring 2 are inclined so as to spread downward toward the outer peripheral side.

  The segment 3 is suspended from the lifting plate 4 so as to be slidable in the horizontal direction. The outer peripheral inclined surface of the segment 3 and the inner peripheral inclined surface of the container ring 2 are slidably engaged, and the segment 3 slides in the horizontal direction when the container ring 2 moves up and down.

  The segment 3 that has been moved downward and abutted against the upper surface of the bottom plate 5 slides on the upper surface of the bottom plate 5 by moving the container ring 2 downward, so that each sector mold 11 is moved to the annular center line CL. In contrast, it is configured to move forward.

  By moving the container ring 2 further downward and moving the sector mold 11 together with the respective segments 3 forward with respect to the annular center line CL, the respective sector molds 9 are assembled in an annular shape, and the upper side mold 10a and the lower side mold 10a are moved downward. The mold 8 is clamped by being assembled with the side side mold 10b.

  The heating body 7 is, for example, a hot plate. In this embodiment, the heating body 7 is installed on each of the upper surface, the side surface, and the lower surface of the container 1 so as to correspond to the outer position of each mold 8. The heating body 7 is installed at an appropriate position on the outer surface of the container 1.

  The injection tube 6a is provided with a heater 6b such as a heater. The heated gas F heated by the heater 6b is blown through the injection pipe 6a toward the tire molding surface S of the closed mold 8.

  The tip (injection port) of the injection tube 6a is preferably opposed to the tire molding surface S of the sector mold 9. In this embodiment, the injection pipe 6 a is bent at a midway position and extends toward the tire molding surface S of the sector mold 9. By setting the tip position of the injection pipe 6a in this way, it is desirable that the heated gas F supplied through the injection pipe 6a be directly blown onto the tire molding surface S of the sector mold 9. Further, since the heated gas F naturally moves upward, the vertical position of the tip of the injection pipe 6 a is preferably set at the lower end of the tire molding surface S of the sector mold 9.

  The number of injection tubes 6a is not limited to one, and a plurality of injection tubes 6a may be provided. When a plurality of injection pipes 6a are provided, it is preferable that their tips (injection ports) are arranged at equal intervals in the circumferential direction around the annular center line CL. Instead of directing the tip of the injection tube 6a only to the tire molding surface S of the sector mold 9 as in this embodiment, each tire molding surface S of the sector mold 9, the upper side mold 10a, and the lower side mold 10b It is also possible to provide an injection tube 6a with the tip directed. Alternatively, the injection pipe 6a with the tip directed can be provided only on the tire molding surface S of the sector mold 9 and the lower side mold 10b.

  The heated gas F is a gas heated to, for example, 100 ° C. to 210 ° C. As the heated gas F, air, inert gas, or the like is used.

  Hereinafter, an example of a procedure for preheating the mold 8 according to the present invention will be described. This preheating is performed, for example, at a preheating station located in the vicinity of the vulcanizer.

  As illustrated in FIG. 1, the container 1 having the mold 8 attached therein is clamped without being installed in the vulcanizer. In this state, the heating body 7 attached to the outer surface of the container 1 is heated (heated). The heating temperature of the heating body 7 is, for example, 150 ° C. to 190 ° C. Further, as illustrated in FIG. 3 through the injection tube 6 a, the heated gas F is blown toward the tire molding surface S of the sector mold 9 in the mold 8. In other words, the heated gas F is blown toward the tire molding surface S for molding the tire tread among the tire molding surfaces S formed on the mold 8. In this embodiment, the heated gas F is sprayed only toward the tire molding surface S of the sector mold 9.

  Heat is supplied to the mold 8 from the heating body 7 and preheated. This heat is radiated from the tire molding surface S. However, since the tire molding surface S is heated by the heated gas F to be blown, the heat radiation amount can be suppressed. Thereby, since the temperature of the tire molding surface S can be raised in a short time, energy consumption can be suppressed and the tire molding surface S can be efficiently preheated. Even when the heated gas F is sprayed only on the tire molding surface S of the sector mold 9, heat from the heated gas F is transmitted to the upper side mold 10a and the lower side mold 10b via the sector mold 9, so that each mold It is effective for raising and lowering the tire molding surface S of No. 8 quickly.

  Since the heating gas F is directly blown onto the tire molding surface S without interposing a vulcanizing bladder, the heat of the heating gas F is effectively used for suppressing heat dissipation from the tire molding surface S and heating the tire molding surface S. be able to. Therefore, it is advantageous to preheat the tire molding surface S efficiently while suppressing energy consumption.

  When the tire molding surface S of the mold 8 rises to a predetermined temperature due to preheating, the container 1 is installed in the vulcanizer. Next, a green tire is installed inside the mold 8 that is opened, and then the mold 8 is closed and then clamped to start vulcanization of the green tire. Therefore, according to the present invention, the vulcanizer is not occupied for preheating the mold 8. As a result, the tire productivity does not deteriorate due to the shortage of the vulcanizer.

  In this embodiment, the heating gas F is sprayed in a direction orthogonal to the molding surface S of the sector mold 9 in plan view. The direction in which the heated gas F is blown may be inclined with respect to the tire molding surface S of the sector mold 9 in plan view. In this spraying direction, since the heated gas F flows so as to turn around the annular center line CL, the temperature variation due to the position of the tire molding surface S can be reduced and the temperature can be raised.

  If an inert gas such as nitrogen gas is used as the heating gas F, it is possible to avoid the occurrence of rust in the mold 8 as compared with the case where air is simply used.

  In the embodiment of the preheating device illustrated in FIG. 4, a seal member 6 c is additionally provided with respect to the previous embodiment. The seal member 6c is disposed at a position covering the tire molding surface S of each mold 8 with a gap g between the tire molding surface S and the seal member 6c. As a result, a gap g surrounded by the seal member 6c and the tire molding surface S of each mold 8 is formed. Therefore, the heated gas F supplied through the injection pipe 6a is accommodated in the gap g.

The seal member 6c has an annular shape, for example. As the sealing member 6c, for example, a member excellent in heat insulation, such as a fiber-based heat insulating material such as glass wool, or a foamed heat insulating material of various materials such as resin, rubber, or elastomer can be used. A heat insulating material having a thermal diffusion coefficient (temperature diffusivity) of 1 mm ² / s or less is preferably used as the seal member 6c.

  In this embodiment, since the heated gas F can be retained in the gap g, the heat of the heated gas F can be used for preheating over a long period of time. Therefore, it becomes more and more advantageous for suppressing energy consumption.

  The embodiment of the preheating device illustrated in FIG. 5 is different from the embodiment illustrated in FIG. 4 in that the recovery pipe 6e collects the heated gas F accommodated in the gap g from the gap g and the heated gas F through the injection pipe 6a. A pump 6d for refluxing the gap g is additionally provided. The injection tube 6a and the recovery tube 6e pass through the seal member 6c, and the distal end (recovery port) of the recovery tube 6e is located above the distal end (injection port) of the injection tube 6a. The injection pipe 6a, the pump 6d, and the recovery pipe 6e form a circulation path for circulating the heated gas F through the gap g.

  By providing the heater 6b in this circulation path, the heated gas F recovered through the recovery pipe 6e is heated by the heater 6b, so that the temperature of the heated gas F is maintained at a high temperature. The heated gas F is heated and maintained at, for example, 100 ° C. to 210 ° C. by the heater 6b. By providing a plurality of combinations of the injection pipe 6a, the heater 6b, the pump 6d, and the recovery pipe 6e, a plurality of the circulation paths can be formed.

  Thus, since the heated gas F injected into the gap g is circulated, the heat of the heated gas F can be effectively used without wasting it. Therefore, it becomes more and more advantageous to suppress the energy consumption used for preheating the tire molding surface S.

  In order to efficiently preheat the tire molding surface S, it is preferable that the distal end of the recovery tube 6e and the distal end of the injection tube 6a are arranged at positions as far as possible from each other. For example, the distal end of the collection tube 6e and the distal end of the injection tube 6a are disposed opposite to each other at a position facing each other in plan view.

  The present invention is not limited to a sectional type mold, and can also be applied to preheating a so-called two-division type tire vulcanization mold that is divided in the tire width direction on the tire equatorial plane.

  The same mold is attached to the container as illustrated in FIG. 1 to be in a closed mold state, and a seal member is disposed at a position covering the tire molding surface at a distance from the tire molding surface as illustrated in FIG. Tire molding surface for four methods (conventional example, Examples 1 to 3) by heating the outer surface of the tire under the same conditions and varying the presence and temperature of heated gas (nitrogen gas) sprayed onto the tire molding surface of the sector mold The temperature of was measured over time. The result is shown in FIG. In the conventional example (curve A in FIG. 6), heated gas is not blown, and in Example 1 (curve B in FIG. 6), Example 2 (curve C in FIG. 6), and Example 3 (curve D in FIG. 6), respectively. The temperature of the heated gas to be sprayed was set to 90 ° C, 150 ° C, and 210 ° C.

  From the results shown in FIG. 6, it can be seen that Examples 1 to 3 can quickly raise the temperature of the tire molding surface as compared with the conventional example.

  FIG. 7 shows the time required for the temperature of the tire molding surface to reach the predetermined temperature for completion of preheating from the predetermined initial temperature for the four types of preheating methods in the conventional example and Examples 1 to 3 shown in FIG. Plotted. In FIG. 7, the conventional example, the first example, the second example, and the third example correspond to points A, B, C, and D, respectively, and the conventional example is shown as an index with a reference of 100. The smaller the index value, the shorter the required preheating time.

  From the results shown in FIG. 7, it can be seen that if the temperature of the heated gas blown onto the tire molding surface is 90 ° C. or higher, the preheating time can be reduced to about 50% compared to the conventional case.

DESCRIPTION OF SYMBOLS 1 Tire vulcanization container 2 Container ring 3 Segment 4 Elevating plate 5 Bottom plate 6a Injection pipe 6b Heater 6c Sealing member 6d Pump 6e Recovery pipe 7 Heating body 8 Tire vulcanization mold 9 Sector mold 10a Upper side mold 10b Lower side Side mold g Clearance F Heated gas S Tire molding surface

Claims (7)

For tire vulcanization, in which a tire vulcanization mold is attached to a tire vulcanization container and the tire vulcanization container is not installed in a vulcanizer equipped with a vulcanization bladder, and the mold is preheated. A mold preheating method,
For vulcanizing a tire, characterized in that a heated gas is blown toward at least a tire molding surface for molding a tire tread among tire molding surfaces formed in the mold, and an outer surface of the tire vulcanizing container is heated. Mold preheating method.   The method for preheating a tire vulcanization mold according to claim 1, wherein an inert gas is used as the heating gas.   3. The tire vulcanization according to claim 1, wherein a seal member is disposed at a position covering the tire molding surface formed on the mold so as to leave a gap with the tire molding surface, and the heated gas is accommodated in the gap. Mold preheating method.   The method for preheating a tire vulcanization mold according to claim 3, wherein the heated gas contained in the gap is recovered and then heated to be refluxed. A tire vulcanization mold preheating device comprising a tire vulcanization container in which a tire vulcanization mold is attached, and the tire vulcanization container not used in a vulcanizer. ,
An injection pipe for supplying a heated gas to be blown toward at least a tire molding surface for molding a tire tread among tire molding surfaces formed in the mold attached to the inside of the tire vulcanizing container, and for the tire vulcanization A preheating device for a tire vulcanization mold, comprising: a heating body attached to the outside of the container.   The tire according to claim 5, wherein a seal member is provided at a position covering the tire molding surface formed in the mold so as to be spaced from the tire molding surface, and the heated gas is accommodated in the gap. Preheating device for vulcanization mold.   A recovery pipe for recovering the heated gas stored in the gap from the gap; a heater for heating the recovered heated gas; and a pump for refluxing the heated gas heated by the heater through the injection pipe. The tire vulcanization mold preheating device according to claim 6.

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