JP6428174B2 - Vulcanizing mold cleaning method and cleaning support jig - Google Patents

Description

  The present invention relates to a method for cleaning a vulcanization mold and a cleaning support jig, and more specifically, without using large-scale equipment when spraying granular dry ice on the mold surface of a vulcanization mold for cleaning. The present invention relates to a vulcanizing mold cleaning method and a cleaning support jig that enable efficient cleaning for a long time.

  In the manufacturing process of rubber products such as tires, a molded body made of unvulcanized rubber is vulcanized using a vulcanization mold. Since the components contained in the compact adhere to and accumulate on the mold surface of the vulcanization mold over time, cleaning is performed in a timely manner. Various cleaning methods have been proposed (see, for example, Patent Document 1).

  In the sector (tire vulcanization mold) cleaning method described in Patent Literature 1, the back surface opposite to the sector molding surface is brought into contact with a flat heating plate and heated to 240 ° C to 260 ° C. Thereafter, the sector is separated from the heating plate and moved to another stage, and dry ice pellets are sprayed to remove dirt adhered to the mold surface. It is described that when dry ice pellets collide with the mold surface of a heated sector, dirt on the mold surface is rapidly and drastically cooled and cracks and the like based on thermal shock are generated and effectively removed. . Since dry ice pellets sublimate, there is also an advantage that no further cleaning is required.

  Since the compressed air is blown violently along with the dry ice pellets of about −80 ° C. on the mold surface, the temperature of the mold surface rapidly decreases when the cleaning operation is started. Since the temperature of the dirt is lowered with the temperature of the mold surface, the thermal shock generated in the dirt is reduced, so that the cleaning efficiency is remarkably lowered.

  After a certain period of time has elapsed since the start of the cleaning operation, it becomes difficult to remove the dirt, so that the cleaning time becomes long, and accordingly, the temperature of the molding surface is further lowered. There is also a demerit that the consumption of dry ice pellets increases as the cleaning time increases.

  Also, many sectors have a curved back surface. When such a sector is heated, the back surface does not sufficiently come into contact with the flat plate-like heating plate, so that the heating time becomes long. In the method described in Patent Document 1, the sector is heated by supplying high-temperature steam in addition to the heating plate. However, a facility for generating high-temperature steam and a sealed space for sealing the steam together with the sector are required. There is a demerit that becomes large scale.

JP 2008-114479 A

  The present invention has been made in view of the above problems, and its purpose is to efficiently clean for a long time without using large-scale equipment when cleaning by spraying granular dry ice on the molding surface of the vulcanizing mold. It is an object of the present invention to provide a vulcanizing mold cleaning method and a cleaning support jig that can be used.

  In order to achieve the above object, the vulcanization mold cleaning method of the present invention is a method of cleaning a vulcanization mold in which the vulcanization mold is heated and sprayed with granular dry ice on the molding surface of the mold. In the method, the heat storage member is attached to and integrated with the back surface on the opposite side to the molding surface, and after the heat storage member is heated together with the mold, the heat storage member remains integrated with the mold. In this case, the dry ice is sprayed on the mold surface for cleaning.

  The vulcanization mold cleaning support jig of the present invention is a vulcanization mold cleaning support jig used for cleaning by spraying granular dry ice on a mold molding surface of a heated vulcanization mold, It has a mounting surface that comes into surface contact with the back surface opposite to the molding surface, and is provided with a heat storage member that can be attached to and detached from the mold, and the heat storage member is in a lump shape, and when spraying the dry ice, It is characterized by being left attached to the back of the mold.

  According to the present invention, since the heat storage member is brought into surface contact with the back surface of the vulcanization mold to be integrated and heated, heat can be stored in the heat storage member together with the mold. Thereafter, since the mold is cleaned while the heat storage member is integrated with the mold, heat can be supplied from the heat storage member to the mold to which dry ice and compressed air are blown. Therefore, it becomes easy to maintain the temperature of the molding surface of the mold at a high temperature, and it becomes possible to clean efficiently for a long time.

  In addition, since a heat storage member that is integrated by bringing it into surface contact with the back surface of the mold may be prepared, a large facility is not required.

  In the present invention, a member having a thermal conductivity of 80 W / mk or more can be used as the heat storage member. As a result, the heat of the heat storage member can be rapidly supplied to the mold that is deprived of heat by blowing dry ice or the like, which is advantageous in maintaining the temperature of the molding surface at a high temperature.

  It is also possible to spray dry ice on the molding surface while heating the heat storage member by the connected heating means. By supplying heat from the heat generating means to the heat storage member even during the cleaning operation, the amount of heat supplied from the heat storage member to the mold can be increased, so it is more advantageous to maintain the mold surface temperature at a high temperature for a long time. become. As a vulcanization mold, for example, a sector for tire vulcanization is targeted.

It is explanatory drawing which illustrates the washing | cleaning assistance jig | tool of the mold for vulcanization | cure of this invention. It is explanatory drawing which illustrates the washing | cleaning assistance jig | tool of FIG. 1 by planar view. It is explanatory drawing which illustrates the washing | cleaning assistance jig | tool of FIG. 1 in an AA cross section. It is explanatory drawing which illustrates the state which integrates and heats the washing | cleaning assistance jig | tool and the mold for vulcanization | cure. It is explanatory drawing which illustrates the washing | cleaning assistance jig | tool and vulcanization mold of FIG. 4 by planar view. It is explanatory drawing which illustrates the washing | cleaning assistance jig | tool and vulcanization mold of FIG. 4 in a BB cross section. It is explanatory drawing which illustrates the state which wash | cleans the vulcanization mold. It is explanatory drawing which shows the washing | cleaning assistance jig | tool provided with a heat generating means. It is explanatory drawing which illustrates the washing | cleaning assistance jig | tool of FIG. 8 by planar view.

Hereinafter, a method for cleaning a vulcanization mold and a cleaning support jig of the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIGS. 1 to 3, the vulcanization mold cleaning support jig 1 of the present invention includes a massive heat storage member 2. In this embodiment, the heat storage member 2 has a substantially rectangular parallelepiped shape, but the upper surface. Is formed in an arc shape protruding downward. Specifically, an arcuate mounting surface 3 that is in surface contact with the vulcanization mold to be cleaned is formed on the upper surface side of the heat storage member 2, and the bottom surface 4 is formed flat. In FIG. 1, the mounting surface 3 is indicated by a broken line. Opposing side wall portions 5 are erected at both ends in the width direction of the mounting surface 3. On the other hand, both ends of the mounting surface 3 in the circumferential direction of the arc are U-shaped openings 6. Under each opening 6, a gripping portion 7 is overhanging. The grip portion 7 is used when an operator moves the cleaning support jig 1.

  The shape of the mounting surface 3 is appropriately changed according to the back surface shape of the vulcanization mold to be mounted. The heat storage member 2 is formed by cutting or casting a metal such as aluminum or iron.

  Next, a method for cleaning the vulcanizing mold using the cleaning support jig 1 will be described by taking as an example the case where the vulcanizing mold 8 is a tire vulcanizing sector 8 (hereinafter referred to as sector 8). First, as illustrated in FIGS. 4 to 6, the sector 8 is placed on the cleaning support jig 1. The sector 8 has a molding surface 9 for molding a tire with a tread pattern and the like, and a back surface 10 opposite to the molding surface 9. It is formed in a circular arc shape that is on the side. In FIG. 4, a boundary portion between the back surface 10 of the sector 8 and the mounting surface 3 of the cleaning support jig 1 formed in a shape along the back surface 10 is indicated by a broken line.

  The sector 8 is placed on the cleaning support jig 1 in a state where the back surface 10 is in surface contact with the mounting surface 3 of the heat storage member 2 and is in an integrated state. Most of the back surface 10 (for example, an area of 90% or more) is in surface contact with the mounting surface 3, and preferably the entire back surface 10 is in surface contact. Both ends of the sector 8 in the circumferential direction are placed in a state of projecting from the opening 6 of the heat storage member 2, and part of a pair of side surfaces located in the horizontal direction perpendicular to the circumferential direction of the sector 8 is an attachment surface 3 is gripped inside a pair of side wall portions 5 erected on 3. The side wall 5 is preferably formed in a shape that is in surface contact with a part of the side surface of the sector 8. A movable claw or the like may be installed on the cleaning support jig 1 and the sector 8 may be fixed by the movable claw so that the cleaning support jig 1 and the sector 8 can be integrated more firmly.

  The cleaning support jig 1 integrated with the sector 8 is placed on the heating plate 11 to heat the sector 8 together with the heat storage member 2. Since the flat bottom surface 4 of the heat storage member 2 is in surface contact with the heating plate 11 having a flat top surface, the heat storage member 2 can be efficiently heated by the heating plate 11.

  Since the attachment surface 3 of the heat storage member 2 is formed in advance along the shape of the back surface 10 of the sector 8, the heat supplied from the heating plate 11 is supplied to the sector 8 via the heat storage member 2. Since the heat storage members 2 in surface contact with each other are arranged in close contact between the back surface 10 of the sector 8 and the heating plate 11, the heating efficiency of the sector 8 can be improved. When the back surface 10 of the vulcanizing mold 8 is not flat like the sector 8, the heating efficiency is increased by arranging the heat storage member 2 in surface contact with the vulcanizing mold 8 and the heating plate 11. It can be significantly improved.

  When the heating time until the vulcanizing mold 8 is heated to a predetermined temperature is compared between the case where the cleaning support jig 1 of the present invention is used and the case where it is not used, the former has a heating time of 50 compared to the latter. % Can be shortened. Since the efficiency at the time of heating the vulcanization mold 8 is improved, a large facility for supplying high-temperature steam or the like as in the prior art becomes unnecessary.

  After heating the sector 8 and the heat storage member 2 to a predetermined temperature (for example, 200 ° C.), the sector 8 is moved onto the work table 12 while being integrated with the heat storage member 2 as illustrated in FIG. . The nozzle 13 is directed to the molding surface 9 of the sector 8 and the granular dry ice sprayed together with the compressed air from the dry ice feeder 14 is sprayed to remove the dirt adhering to the molding surface 9. The granular dry ice is, for example, pelletized dry ice or powdered dry ice having a particle size smaller than that of the pellet.

  Due to the contact with dry ice and the compressed air injected together with the dry ice, the temperature of the dirt adhering to the mold surface 9 decreases. However, since heat is sequentially transferred from the heat storage member 2 attached to and integrated with the rear surface 10 side of the sector 8 to the sector 8, the high temperature state of the sector 8 is maintained. Along with this, it is possible to suppress the temperature drop of dirt on the molding surface 9, so that it is possible to clean efficiently for a long time.

  Further, since the heat storage member 2 is attached to the back surface 10 side of the sector 8, there is no hindrance to the cleaning work of spraying dry ice on the mold surface 9. For example, when heat is to be supplied directly to the mold surface 9 of the sector 8 that is being cleaned by a warm air machine or the like, the warm air disturbs the flow of compressed air that blows dry ice and reduces the cleaning efficiency.

  The heat storage member 2 is desirably formed smaller than the sector 8 in plan view. In this embodiment, as illustrated in FIG. 5, a part of the side wall 5 of the heat storage member 2 protrudes from the sector 8, but the other part is formed smaller than the sector 8. This makes it difficult for dry ice and compressed air to directly collide with the heat storage member 2 when dry ice is blown onto the molding surface 9 of the sector 8. In other words, the heat of the heat storage member 2 can be suppressed from moving to dry ice or compressed air, and most of the heat can be moved to the sector 8, so that the heat of the heat storage member 2 is prevented from being wasted and the temperature is reduced. It is advantageous to suppress the decrease.

  The volume of the heat storage member 2 is desirably set in a range of, for example, 30 to 200% with respect to the volume of the sector 8 to be mounted. If the volume of the heat storage member 2 is too small, the amount of heat that can be stored tends to be insufficient, and if the volume of the heat storage member 2 is excessive, handling when the cleaning support jig 1 is moved becomes inconvenient.

  As a material for forming the heat storage member 2, it is desirable to select the same material as that of the sector 8 to be mounted or a material having a close thermal conductivity. Thereby, the thermal gradient when heat moves from the heat storage member 2 to the molding surface 9 of the sector 8 becomes uniform, and it becomes easy to efficiently move the heat. If the thermal conductivity of the heat storage member 2 is too low with respect to the sector 8, the amount of heat transferred from the heat storage member 2 to the sector 8 is reduced even though the temperature of the molding surface 9 is reduced during the cleaning operation. It may be difficult to maintain the temperature of 9. If the thermal conductivity of the heat storage member 2 is too high, the amount of heat transferred from the heat storage member 2 to the atmosphere during the cleaning operation increases, and it may be difficult to supply sufficient heat to the sector 8.

  When the sector 8 is made of aluminum, the heat storage member 2 is made of the same material and has an aluminum thermal conductivity of 236 W / mk (0 ° C.) or a thermal conductivity of 83.5 W / mk (0 ° C.). It is desirable to form iron, brass (brass) having a thermal conductivity of 106 W / mk (0 ° C.), or the like. The appropriate material of the heat storage member 2 differs depending on the material forming the sector 8, but considering the speed at which the molding surface 9 is cooled by dry ice, the heat storage member 2 has a thermal conductivity of 80 W / mk or more and 500 W / mk or less. It is desirable to form with the material which has.

By using the present invention, the cleaning time of the sector 8 can be greatly shortened, so that the working efficiency can be improved and the consumption of granular dry ice can be greatly suppressed. For example, when cleaning eight sectors 8 used downstream of one tire, if the conventional method requires a cleaning time of one hour per sector 8, for example, the sector 8 for one tire is cleaned. Requires 8 hours. On the other hand, when the cleaning support jig 1 is used, the cleaning time per sector 8 can be set to about 20 minutes, so the time required for cleaning the sector 8 for one tire is 2 hours 40 It can be shortened to about minutes. As the cleaning time is shortened, the consumption of granular dry ice can be suppressed to about 1/3.

  As illustrated in FIGS. 8 and 9, the heat storage member 2 may be connected to the heat storage member 2 so that the heat storage member 2 is continuously heated by the heat generation device 15 during the cleaning operation. In this embodiment, the heat generating means 15 includes two heater wires 16 disposed between the attachment surface 3 and the back surface 4 of the heat storage member 2, and a power source 17 that supplies electricity to the heater wires 16. Become.

  Since the heat storage member 2 can be continuously heated by the heater wire 16 while the sector 8 is being cleaned, it is further advantageous to maintain the temperature of the molding surface 9 at a high temperature. According to this configuration, for example, when the groove of the molding surface 9 such as the sector 8 for the studless tire is fine and complicated, or when the groove is the large sector 8, the cleaning operation cannot be completed in a short time. However, it is possible to suppress a decrease in cleaning efficiency by maintaining the temperature of the heat storage member 2 at a high temperature for a long time.

  In addition, since heat can be supplied to the heat storage member 2 even during the cleaning operation, there is no possibility that the amount of heat supplied from the heat storage member 2 to the sector 8 is insufficient even if the volume of the heat storage member 2 is reduced. Therefore, it becomes possible to reduce the size of the heat storage member 2 and provide the cleaning support jig 1 that is easier to handle.

  The heat storage member 2 may be heated by the heater wire 16 as long as it can be performed at least during the cleaning operation. This heating may be continuous or intermittent. Further, while the heat storage member 2 and the sector 8 are heated on the heating plate 11, it is possible to supply the electricity to the heater wire 16 to heat the heat storage member 2. Thereby, the heating time of the heat storage member 2 and the sector 8 can be further shortened. The heating of the heat storage member 2 by the heater wire 16 may be configured to start after a predetermined time has elapsed after the start of the cleaning operation.

  The heat generating means 15 is not limited to the heater wire 16 or the like, and it is sufficient that the heat storage member 2 can be heated. For example, it can also be comprised with the flow path formed in the thermal storage member 2, and the heat medium supply machine which supplies and circulates the heating medium heated to this flow path.

  Further, the heat storage member 2 can be formed of a plurality of materials. For example, the heat storage member 2 is configured to enclose a material having a relatively high specific heat. According to this configuration, since the total amount of heat that can be stored without increasing the volume of the heat storage member 2 can be increased, for example, when used for cleaning the sector 8 having a complicated tread pattern that takes time to clean, This is advantageous for maintaining the temperature of the molding surface 9 at a high temperature for a long time.

  The present invention is not limited to the sector 8, and can be applied to the case of cleaning the vulcanizing mold 8 used when vulcanizing rubber products.

  An experiment was carried out in which a sector of the same specification formed of aluminum was heated to 200 ° C., and granular dry ice was sprayed to clean the mold surface and the required cleaning time was measured. When the index is set to 100 based on the cleaning time of the conventional method that does not use the cleaning support jig of the present invention, the same cleaning support jig illustrated in FIGS. 1 to 3 having a heat storage member formed of aluminum is used. The index was 30 to 50, and the index was 60 to 80 when the cleaning support jig in which the heat storage member was made of iron was used. The smaller the index value, the shorter the cleaning time.

  After a predetermined time after the start of the cleaning operation, the heat storage member was heated for a certain period of time by the heating means and cleaned, and the above index could be further reduced by about 5-10.

DESCRIPTION OF SYMBOLS 1 Cleaning assistance jig 2 Heat storage member 3 Mounting surface 4 Bottom surface 5 Side wall part 6 Opening part 7 Holding part 8 Heating mold (sector)
9 Molding surface 10 Back surface 11 Heating plate 12 Work table 13 Nozzle 14 Dry ice feeder 15 Heating means 16 Heater wire 17 Power supply

Claims (8)

In the vulcanization mold cleaning method of heating the vulcanization mold and spraying granular dry ice on the molding surface of the mold for cleaning,
The heat storage member is attached to and integrated with the back surface opposite to the molding surface, and the heat storage member is heated together with the mold, and then the mold storage is performed while the heat storage member is integrated with the mold. A method for cleaning a vulcanization mold, wherein the surface is cleaned by spraying the dry ice.   The method for cleaning a vulcanization mold according to claim 1, wherein a member having a thermal conductivity of 80 W / mk or more is used as the heat storage member.   The method for cleaning a vulcanization mold according to claim 1 or 2, wherein the dry ice is sprayed onto the molding surface while the heat storage member is heated by a connected heating means.   The vulcanization mold cleaning method according to claim 1, wherein the mold is a tire vulcanization sector. A cleaning support jig for a vulcanization mold used for cleaning by spraying granular dry ice on a mold surface of a heated vulcanization mold,
It has a mounting surface that comes into surface contact with the back surface opposite to the molding surface, and is provided with a heat storage member that can be attached to and detached from the mold, and the heat storage member is in a lump shape, and when spraying the dry ice, A cleaning support jig for a vulcanization mold, wherein the jig is left attached to the back of the mold.   The cleaning support jig for a vulcanization mold according to claim 5, wherein the heat storage member has a thermal conductivity of 80 W / mk or more.   The cleaning support jig for a vulcanization mold according to claim 5 or 6, further comprising heat generating means that is connected to the heat storage member when spraying the dry ice.   The cleaning assist jig for a vulcanization mold according to any one of claims 5 to 7, wherein the mold is a sector for tire vulcanization.

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