JP5454250B2 - Manufacturing method of tire vulcanization mold - Google Patents

Description

  The present invention relates to a method for manufacturing a mold for vulcanizing a tire, and more particularly, it is possible to prevent breakage of a gypsum mold and removal of a sipe blade from the gypsum mold by simple processing. It is related with the manufacturing method of the mold for tire vulcanization which can use repeatedly the member used for.

  As a method of manufacturing a tire vulcanization mold, a master mold is prepared, a rubber mold in which the surface shape of the master mold is transferred is manufactured, a gypsum mold in which the surface shape of the rubber mold is transferred is manufactured, and then a gypsum mold is manufactured. There is known a gypsum mold method in which a molten metal is poured into the surface of the mold to cast a mold in which the surface shape of the gypsum mold is transferred. In recent years, molds for tire vulcanization have become complicated shapes due to various performance requirements for tires. In the gypsum mold method, when the tire vulcanization mold has a complicated shape and fine projections are formed on the gypsum mold, the projections are removed when the gypsum mold is released from the rubber mold. May be damaged.

  Therefore, various methods have been proposed in order to prevent such damage to the gypsum mold (see Patent Document 1). For example, as described in FIG. 7 of Patent Document 1, a reinforcing member is integrally provided on a thin bone member for forming a sipe, and a part of the thin bone member is embedded in a necessary part of a rubber mold. At the same time, the plaster mold is manufactured by pouring gypsum with the reinforcing material exposed. According to this method, since the periphery of the portion where the reinforcing material of the gypsum mold is embedded is reinforced by the reinforcing material, the gypsum mold is hardly damaged when the gypsum mold is released from the rubber mold. However, in this method, it is necessary to prepare a thin bone member with a reinforcing material integrally attached thereto. And since the part of the reinforcing material which becomes unnecessary after the completion of the vulcanization mold needs to be cut and the cut part needs to be finished, there is a problem that the operation becomes complicated. There is also a problem that the cut reinforcing material becomes disposable.

  As another method, as described in FIG. 5 of Patent Document 1, it is also proposed to join a reinforcing member to a thin bone member with an adhesive. In this method, there is a problem that it takes time to join the reinforcing material to the thin bone member. Further, there is a problem that it takes time to separate the reinforcing material bonded to the fine bone member after the vulcanization mold is completed.

  The reinforcing material embedded in the gypsum mold exhibits an anchor effect that makes it difficult for the fine bone member to come out of the gypsum mold by providing a through hole or slit as described in FIG. However, it is difficult to obtain a sufficient anchor effect with a plate-like reinforcing material as described in Patent Document 1.

JP-A-11-170267

  It is an object of the present invention to prevent damage to a gypsum mold and to prevent a sipe blade from coming off from the gypsum mold by simple processing, and a tire that can be used repeatedly for preventing damage and preventing slippage. It is providing the manufacturing method of the mold for vulcanization | cure.

  In order to achieve the above object, the method for producing a tire vulcanization mold according to the present invention produces a rubber mold in which a rubber material is poured onto the surface of the master mold to transfer the master mold surface shape, In a method for manufacturing a tire vulcanization mold, in which a gypsum mold is poured to produce a gypsum mold in which the surface shape of a rubber mold is transferred, and then a mold in which molten metal is poured onto the surface of the gypsum mold to transfer the surface shape of the gypsum mold is cast. The sipe blade with metal wire attached by twisting together the metal wire inserted through the through-hole provided in the sipe blade in the process of manufacturing the gypsum mold, The gypsum mold is produced by pouring gypsum into the surface of the rubber mold so as to be exposed at a predetermined position on the surface of the rubber mold, and the surface of the gypsum mold. After casting the mold was transferred Jo, the metal wire, and removing from the sipe blade by solving the torsional alignment.

  According to the present invention, in the process of manufacturing the gypsum mold, the metal wire inserted through the through hole provided in the sipe blade is used by twisting the metal wire rod attached to the sipe blade. After casting the mold with the surface transferred, the metal wire is removed from the sipe blade by untwisting the metal wire, so that the metal wire can be easily attached to and removed from the sipe blade. This metal wire is not disposable and can be used repeatedly.

  Also, since the entire metal wire is exposed on the surface of the rubber mold and is placed in a predetermined position on the surface of the rubber mold, gypsum is poured into the surface of the rubber mold to produce a gypsum mold. The entire wire is embedded in a plaster mold. Since the periphery of the portion where the metal wire is embedded is reinforced by the metal wire, the gypsum mold is hardly damaged when the gypsum mold is released from the rubber mold. In addition, since the metal wires are twisted together, the sipe blade is difficult to come off from the gypsum mold, and an excellent anchor effect can be obtained.

  As said metal wire, a dull iron wire, a copper wire, or an aluminum alloy wire can be used, for example. Since a dull iron wire or the like is easily deformed, twisting and untwisting work can be performed quickly. The metal wire is twisted together so that, for example, the opening angle at both ends is 30 ° to 120 °. When it does in this way, the reinforcement effect with respect to the gypsum mold by a metal wire and the anchor effect with respect to the sipe blade will become favorable.

  The protruding length from the sipe blade after the metal wire is twisted together is, for example, 5 mm to 30 mm. When this length is used, the twisting and untwisting operations can be easily performed, and the reinforcing effect for the gypsum mold by the metal wire and the anchor effect for the sipe blade can be easily obtained.

It is a front view which illustrates the blade for sipe and metal wire which are used for the present invention. It is a side view of FIG. It is explanatory drawing which illustrates the process of manufacturing a gypsum mold in a cross section. It is explanatory drawing which illustrates the process of casting a mold in a cross section. It is sectional drawing which illustrates the cast mold.

  Hereinafter, the manufacturing method of the mold for tire vulcanization of the present invention is explained based on the embodiment shown in the figure.

  As illustrated in FIGS. 1 and 2, the sipe blade 1 used in the present invention is provided with through holes 2a and 2b in two upper and lower stages. The number of through-holes 2a and 2b varies depending on the size of the sipe blade 1, but is about 1 to 3, respectively.

  The metal wire 3 is inserted into the lower through hole 2a, and both ends thereof are attached by being twisted together. The outer diameters of the metal wire 3 and the through hole 2a are substantially the same, and the outer diameter is, for example, about 0.5 mm to 1.0 mm.

  The number of twists of the metal wire 3 is not particularly limited, but is, for example, about 1 to 5 times. The upper through-hole 2b is provided in order to prevent the sipe blade 1 from coming off from a tire vulcanization mold 6 (hereinafter referred to as a mold 6) described later.

  In FIG. 1, only one metal wire 3 is attached to the sipe blade 1, but the metal wire 3 can be attached to each through hole 2a. Moreover, the number of the metal wires 3 to be attached can be further increased by increasing the number of through holes 2a. That is, at least one metal wire 3 may be attached, and two or more metal wires 3 are preferably attached in order to ensure stability.

  The material of the sipe blade 1 is, for example, stainless steel, general carbon steel, copper, aluminum alloy, or other metals. As the metal wire 3, a dull iron wire, a copper wire, an aluminum alloy wire or the like can be used. When a dull iron wire or the like is used, it can be easily deformed, so that twisting and untwisting can be performed quickly.

  Next, a procedure for manufacturing the mold 6 using the sipe blade 1 with a metal wire will be described.

  First, a rubber mold 4 is manufactured by pouring a rubber material into the surface of the master mold to transfer the surface shape of the master mold. Next, as illustrated in FIG. 3, the sipe blade 1 with metal wire described above is implanted at a predetermined position on the surface of the rubber mold 4 so that the entire metal wire 3 is exposed on the surface of the rubber mold 4. To the state. In this state, gypsum P is poured into the surface of the rubber mold 4 to produce a gypsum mold 5 in which the surface shape of the rubber mold 4 is transferred. Therefore, the entire metal wire 3 is embedded in the manufactured gypsum mold 5.

  Therefore, the periphery of the portion of the gypsum mold 5 where the metal wire 3 is embedded is effectively reinforced by the metal wire 3, and the gypsum mold 5 is less likely to be damaged when the gypsum mold 5 is released from the rubber mold 4. Moreover, since the metal wire 3 is twisted together and has a complicated shape, the sipe blade 1 is less likely to come out of the gypsum mold 5 as compared with the plate-like member. That is, an excellent anchor effect can be obtained.

  When this gypsum mold 5 is dried, it may be heated to 200 ° C. or higher. Therefore, it is preferable that melting | fusing point of the metal wire 3 is 250 degreeC or more so that the metal wire 3 may not fuse | melt at a drying process.

  Next, as illustrated in FIG. 4, a mold 6 in which a molten metal M such as an aluminum material is poured into the surface of the gypsum mold 5 to transfer the surface shape of the gypsum mold 5 is cast. After the poured molten metal M is solidified, when the gypsum mold 5 is removed, the mold 6 is obtained by transferring the surface shape of the gypsum mold 5.

  At this stage, since the metal wire 3 is still attached to the sipe blade 1, as shown in FIG. 5, the metal wire 3 is untwisted and the sipe blade 1 is removed. Remove from.

  In the present invention, as described above, when the metal wire 3 inserted through the through-hole 2a is attached to the sipe blade 1 by twisting and removed, the twisting may be released. Attachment and removal of the metal wire 3 with respect to the blade 1 is a simple process. Moreover, the metal wire 3 is not disposable but can be used repeatedly.

  When attaching the metal wire 3 to the sipe blade 1, it is preferable to twist the metal wire 3 so that the opening angle A at both ends of the metal wire 3 is 30 ° to 120 °. When the opening angle A is within this range, the reinforcing effect of the metal wire 3 on the gypsum mold 5 is improved. In addition, the sipe blade 1 is more difficult to be removed from the gypsum mold 5, and an excellent anchor effect can be obtained.

  The protruding length of the metal wire 3 from the sipe blade 1 is preferably about 5 mm to 30 mm. The protruding length is a length by which the metal wire 3 after twisting is protruded from the through hole 2 a of the sipe blade 1. If the projecting length is within this range, the work of twisting or untwisting the metal wire 3 is further facilitated. Moreover, since the length of the metal wire 3 embedded in the gypsum mold 5 is increased, the reinforcing effect on the gypsum mold 5 can be easily improved. For the same reason, it becomes difficult for the sipe blade 1 to come out of the gypsum mold 5 and an anchor effect is easily obtained.

  The present invention may be applied, for example, when the mold 6 is manufactured using the sipe blade 1 having a length of 25 mm or more.

DESCRIPTION OF SYMBOLS 1 Blade for sipe 2a, 2b Through-hole 3 Metal wire material 4 Rubber mold 5 Gypsum mold 6 Mold M Molten metal P Gypsum

Claims (4)

  A rubber material is poured onto the surface of the master mold to produce a rubber mold in which the surface shape of the master mold is transferred, and then a gypsum mold is cast onto the surface of the rubber mold to transfer the surface shape of the rubber mold. In a method for manufacturing a tire vulcanization mold in which a molten metal is poured into a mold surface and a mold in which the surface shape of the gypsum mold is transferred is cast, in the process of manufacturing the gypsum mold, the mold is inserted into a through hole provided in the sipe blade. The metal wire rod is attached to the sipe blade with the metal wire rod by twisting together, the entire metal wire rod is exposed on the surface of the rubber die, and is placed in a predetermined position on the surface of the rubber die, The gypsum mold is produced by pouring gypsum into the surface of the rubber mold, and after casting the mold that transfers the surface shape of the gypsum mold, the metal wire is twisted together. Method for producing a tire vulcanizing mold, and removing brought from the sipe blade Solve.   The method for producing a mold for tire vulcanization according to claim 1, wherein the metal wire is a blunt iron wire, a copper wire, or an aluminum alloy.   The method for manufacturing a mold for tire vulcanization according to claim 1 or 2, wherein the metal wire is twisted so that an opening angle between both ends is 30 ° to 120 °.   The method for producing a tire vulcanization mold according to any one of claims 1 to 3, wherein a protrusion length from the sipe blade after the metal wires are twisted together is 5 mm to 30 mm.

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