JP2016179640A - 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: An outside surface of a tire vulcanizing container 1 is heated by a heating body 7 while a heated gas F is injected through an injection pipe 6a into a gap g between an outer peripheral surface of a vulcanizing bladder 9a and a tire molding surface of the molds 11, 12a and 12b in a state of attaching the molds 11, 12a and 12b to a tire vulcanizing container 1 comprising a segment 3 which is attached to the outer peripheral surface of a plurality of respective selector molds 11 annularly arranged, a lifting and lowering plate 4 to which an upper side mold 12a is attached, a bottom plate 5 to which a lower side mold 12b is attached and a container ring 2 which vertically moves to install on a vulcanizer 8 and arranging the vulcanizing bladder 9a inside the molds 11, 12a and 12b.SELECTED DRAWING: Figure 1

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. If the vulcanization is interrupted for some reason while the green tire is continuously vulcanized, a time loss occurs in the process for the same reason when starting to vulcanize a new green tire.

  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.

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 tire vulcanization mold preheating method according to the present invention includes a tire vulcanization mold mounted inside a tire vulcanization container, and the tire vulcanization container includes a vulcanization bladder. A preheating method for a tire vulcanization mold, which is installed in a vulcanizer and in which the vulcanization bladder is disposed inside the mold, and the mold is preheated,
A heating gas is injected between the outer surface of the vulcanizing bladder and a tire molding surface formed in the mold, and the outer surface of the tire vulcanizing container is heated.

  The tire vulcanization mold preheating apparatus of the present invention includes a tire vulcanization container in which a tire vulcanization mold is attached, and a vulcanization in which the tire vulcanization container is installed and disposed inside the mold. A tire vulcanization mold preheating device comprising a vulcanizer having a vulcanizer for a tire, the tire molding surface formed in the mold attached to the inside of the tire vulcanization container, and the vulcanization bladder It has the injection pipe which inject | pours heated gas in the clearance gap between these, 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 injected between the outer surface of the vulcanizing bladder and the tire molding surface formed on the mold, the ambient temperature of the clearance increases. Therefore, even if the heat supplied from the outer surface of the vulcanizing container dissipates heat from the tire molding surface of the mold, the amount of heat dissipation can be suppressed because the ambient temperature of the gap is high. 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 injected into the gap, the heat of the heated gas can be effectively used for suppressing heat dissipation from the tire molding surface and for 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.

  After the heated gas injected into 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 bladder for vulcanization | cure of FIG. 1, a sector mold, and a segment by planar view. It is explanatory drawing which illustrates another embodiment of a preheating apparatus by a 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 vulcanizing 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 vulcanizing mold preheating device (hereinafter referred to as a preheating device) of the present invention illustrated in FIG. 1 includes a tire vulcanizing container 1 (hereinafter referred to as a container 1) and a vulcanizing bladder 9a. 1 is provided, a heating body 7 attached to the outside of the container 1, and an injection pipe 6 a for injecting a heating gas F into the container 1. The vulcanizer 8 has a central mechanism 9 provided with a cylindrical vulcanizing bladder 9a. The upper edge portion and the lower edge portion of the vulcanizing bladder 9a are held by holding plates attached to the central mechanism 9 with an interval in the vertical direction.

  Inside the container 1, a sectional type tire vulcanization mold 10 (hereinafter referred to as a mold 10) is attached. As illustrated in FIG. 2, the mold 10 includes a plurality of (for example, about eight) sector molds 11 that are annularly arranged to mold a tire tread, an annular upper side mold 12 a that molds a tire sidewall, and It is comprised by the lower side mold 12b. A tire molding surface S is formed on the inner surface of each mold 10. The vulcanizing bladder 9a is arranged inside the mold 10. An alternate long and short dash line in the figure indicates an annular center line CL of the sector mold 11 arranged in an annular shape.

  The container 1 includes a segment 3 attached to the outer peripheral surface of each sector mold 11, a lift plate 4 to which an upper side mold 12a is attached, a bottom plate 5 to which a lower side mold 12b 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 11 can be assembled in an annular shape, and the upper side mold 12a and the lower side mold 12a. The mold 10 is clamped by being assembled with the side-side mold 12b.

  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 10. 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 injected into the gap g between the outer surface of the non-expanded vulcanizing bladder 9a and the tire molding surface S of each mold 10 through the injection pipe 6a.

  The tip (injection port) of the injection pipe 6a is preferably opposed to the tire molding surface S of the sector mold 11. 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 11. By setting the tip position of the injection pipe 6a in this way, it is desirable that the heated gas F injected from the injection pipe 6a does not directly hit the vulcanizing bladder 9a. Further, since the heated gas F naturally moves upward, the vertical position of the tip of the injection tube 6a is preferably set at the lower end of the tire molding surface S of the sector mold 11.

  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.

  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 10 according to the present invention will be described.

  As illustrated in FIG. 1, the container 1 to which the mold 10 is attached is installed in the vulcanizer 8 so that the mold 10 is clamped. 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, the heated gas F is injected into the gap g between the outer surface of the vulcanizing bladder 9a and the tire molding surface S of each mold 10 through the injection pipe 6a.

  Heat is supplied to the mold 10 from the heating body 7 and preheated. The heated gas F is injected into the gap g, and the atmospheric temperature of the gap g is increased. Therefore, even if the heat supplied from the outer surface of the container 1 dissipates heat from the tire molding surface S, the heat dissipation 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.

  Since the heating gas F is directly injected into the gap g, the heat of the heating gas F can be effectively used for suppressing heat dissipation from the tire molding surface S and for heating the tire molding surface S. 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 10 rises to a predetermined temperature due to preheating, the mold 10 is opened and a green tire is installed therein, then the mold 10 is closed and then clamped to vulcanize the green tire. To start. Therefore, according to the present invention, the waiting time until the tire molding surface S of the mold 10 rises to a predetermined temperature is shortened, and the time loss in the vulcanization process can be reduced, which contributes to the improvement of tire productivity. .

  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 10 as compared with the case where air is simply used.

  In another embodiment of the preheating device illustrated in FIG. 3, a recovery pipe 6d that recovers the heated gas F injected into the gap g from the gap g, a heater 6b that heats the recovered heated gas F, and a heater 6b. And a pump 6c that recirculates the heated heated gas F to the gap g through the injection pipe 6a. That is, a circulation path for circulating the heated gas F through the gap g is formed by the injection pipe 6a, the pump 6c, and the recovery pipe 6d.

  By providing the heater 6b in this circulation path, 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 6c, and the recovery pipe 6d, 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 the present invention, since the mold 10 is preheated with the container 1 installed in the vulcanizer 8, vulcanization of the green tire can be started as soon as the tire molding surface S of the mold 10 rises to a predetermined temperature. Therefore, there is no problem that the temperature of the mold 10 preheated before the container 1 is installed in the vulcanizer 8 is lowered.

  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.

  As shown in FIG. 1, the same mold is attached to the container and installed in the vulcanizer, and the outer surface of the container is heated under the same conditions. The outer surface of the vulcanizing bladder and the tire molding surface of each mold The temperature of the tire molding surface was measured over time for four methods (conventional examples and examples 1 to 3) by varying the presence and temperature of the heated gas (nitrogen gas) injected into the gap. The result is shown in FIG. The conventional example (curve A in FIG. 4) does not inject heated gas, and Example 1 (curve B in FIG. 4), Example 2 (curve C in FIG. 4), and Example 3 (curve D in FIG. 4) are The temperature of the heated gas to be injected was 90 ° C., 150 ° C., and 210 ° C., respectively.

  From the results shown in FIG. 4, it can be seen that Examples 1 to 3 can quickly increase the temperature of the tire molding surface as compared with the conventional example.

  FIG. 5 shows the time required for the temperature of the tire molding surface to reach a predetermined temperature for completion of preheating from the predetermined initial temperature for the four preheating methods of the above-described conventional example and Examples 1 to 3. Plotted. In FIG. 5, 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 indicated by an index with reference 100. The smaller the index value, the shorter the required preheating time.

  From the results shown in FIG. 5, if the temperature of the heated gas injected between the outer surface of the vulcanizing bladder and the tire molding surface of each mold is 90 ° C. or higher, the preheating time is about 50 times that of the conventional case. It can be seen that it can be about%.

DESCRIPTION OF SYMBOLS 1 Tire vulcanization container 2 Container ring 3 Segment 4 Elevating plate 5 Bottom plate 6a Injection pipe 6b Heater 6c Pump 6d Recovery pipe 7 Heating body 8 Vulcanizer 9 Central mechanism 9a Vulcanization bladder 10 Tire vulcanization mold 11 Sector mold 12a Upper side mold 12b Lower side mold F Heated gas S Tire molding surface

Claims (5)

A tire vulcanization mold is mounted inside a tire vulcanization container, the tire vulcanization container is installed in a vulcanizer equipped with a vulcanization bladder, and the vulcanization bladder is disposed inside the mold. A preheating method of a tire vulcanization mold for preheating the mold,
Injecting heated gas into the gap between the outer surface of the vulcanizing bladder and the tire molding surface formed in the mold, and heating the outer surface of the tire vulcanizing container 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.   The method for preheating a tire vulcanization mold according to claim 1 or 2, wherein the heated gas injected into the gap is recovered and then heated to be refluxed. A tire vulcanizing container having a tire vulcanizing mold mounted therein, and a vulcanizer having a vulcanizing bladder in which the tire vulcanizing container is installed and disposed inside the mold. A sulfur mold preheating device,
An injection pipe for injecting a heated gas into a gap between a tire molding surface formed in the mold attached to the inside of the tire vulcanizing container and an outer surface of the vulcanizing bladder; and the tire vulcanizing container. A preheating device for a tire vulcanization mold, comprising a heating body attached to the outside.   A recovery pipe for recovering the heated gas injected from the gap from the gap; a heater for heating the recovered heated gas; a pump for refluxing the heated gas heated by the heater through the injection pipe; The preheating apparatus for a tire vulcanization mold according to claim 4, comprising:

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