JP2006263980A - Forming mold for tire vulcanizing mold, manufacturing method of tire vulcanizing mold using the forming mold and tire manufactured using tire vulcanizing mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forming mold for a tire vulcanizing mold excellent in heat conductivity and heat insulating properties, having strength against heat shock, good in surface precision and capable of being used repeatedly, a manufacturing method of the tire vulcanizing mold using this forming mold and a tire manufactured using the tire vulcanizing mold. <P>SOLUTION: The forming mold for manufacturing the tire vulcanizing mold by gravitational casting is made of a graphite material for a mold. This forming mold 1 is constituted of a pattern forming mold 2 divided into a plurality of parts using the graphite material for the mold. Various tire patterns such as profiles 3a or grooves 3b parallel to the center of the forming mold or provided with a draft angle are formed to the surface 2a of the pattern forming mold 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mold for manufacturing a tire vulcanization mold, a method for manufacturing a tire vulcanization mold using the mold, and a tire manufactured using the tire vulcanization mold. In more detail, the mold is manufactured using a graphite material for mold as a raw material, and the mold for tire vulcanization molding is excellent in thermal conductivity and heat insulation and strong against heat shock (temperature change). The present invention relates to a mold, a method for manufacturing a tire vulcanization mold using the mold, and a tire manufactured using the tire vulcanization mold.

  Conventionally, steel molds (see, for example, Patent Document 1), plaster molds, and the like are mainly used as molds used for manufacturing tire vulcanization molds.

However, since the former metal mold has good thermal conductivity, it is necessary to apply a coating mold (heat insulating agent) to the surface to prevent rapid cooling in so-called gravity casting, and the surface accuracy of the mold surface is required. It is not suitable for tire molds. Further, the latter gypsum mold has a problem that it has heat insulation properties but cannot be reused due to insufficient strength.
JP 2001-179752 A

  This invention pays attention to such conventional problems, and by using a graphite material for mold as a mold, it has excellent thermal conductivity and heat insulation, is strong against heat shock, has good surface accuracy, and repeats. Provided is a mold for a tire vulcanization mold that can be used, a method for manufacturing a tire vulcanization mold using the mold, and a tire manufactured using the tire vulcanization mold. It is for the purpose.

  In order to achieve the above object, the present invention provides a molding die for a tire vulcanization molding die according to the present invention, which is a molding die for producing a tire vulcanization molding die by gravity casting. The gist is that the graphite material for mold is formed as a raw material.

  Here, the mold is composed of a plurality of pattern molds, and the dividing lines of the pattern molds are formed so as to be fitted to each other toward the center of the mold, and the mold is formed on the surface of the pattern mold. The tire pattern is formed parallel to the center of the tire or with a draft angle.

  The plurality of divided pattern forming dies are configured to be attachable to and detachable from a jig that can be set on a casting frame, and the plurality of divided pattern forming dies are divided into a plurality of types. The plurality of types of pattern forming dies are configured to be detachable from the jig.

  Further, the tire vulcanization molding die manufacturing method of the present invention includes forming a tire profile and a groove on the molding surface of the molding die of the vulcanization molding die formed from a graphite material for a mold. Then, the mold is composed of a plurality of divided pattern molds that can be fitted to each other toward the center of the mold, and after the divided pattern mold is detachably attached to a jig, It is set in the casting frame, and then the molten metal is poured into the casting frame to cast a vulcanization mold, and after the molten metal solidifies, the molding die is removed together with the jig from the casting frame. It is what.

  Here, the divided pattern forming die is detachably attached to a jig that can be set on the casting frame via a fastening member.

  Furthermore, the gist of the tire manufactured using the tire vulcanization mold according to the present invention is to be manufactured by the above manufacturing method.

  In this way, the mold is made from the graphite material for the mold, so it has excellent thermal conductivity, no cracking against heat shock (temperature change), high strength, good surface accuracy, and repeatability. Can be used.

Since the present invention is configured as described above, the following excellent effects can be obtained. (A). The mold is made of a graphite material for molds, so it has excellent thermal conductivity and does not crack against heat shock (temperature change), which is stronger than conventional metal molds and plaster molds. Show excellent effects.
(B). A tire mold with a clean surface can be manufactured by setting a pattern mold made of reusable graphite for molds on a jig that can be assembled.
(C). By using a graphite material for a mold as the material of the mold and engraving the shape of the tire pattern in the mold, it is possible to obtain a mold that has a good casting surface and can be repeated.
(D). Divided into multiple types, the pattern mold is divided into multiple types, and these multiple types of pattern mold can be attached to and detached from the jig. And repair can be performed easily.
(E). Since a graphite material for molds having a good thermal conductivity is used, a tire mold having a good surface accuracy of a metal material such as aluminum can be obtained.
(F). By shortening the cutting time compared to metal molds such as steel, the delivery time can be shortened and productivity can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an overall perspective view of one mold for producing a tire vulcanization mold according to the present invention, FIG. 2 is a front view of one mold, and this mold 1 is used for a mold. A pattern molding die 2 constructed by dividing into a plurality of parts using a graphite material (for example, standard GMC-100 manufactured by Nippon Electrode Co., Ltd.) was manufactured. Various tire patterns such as a profile 3a and a grooving 3b provided with a parallel or draft angle with respect to the center of the tire are formed.

  In the embodiment of the present invention, the pattern forming die 2 is formed into a plurality of substantially fan-shaped patterns 1A as shown in FIG. 3 and a plurality of substantially fan-shaped shapes as shown in FIG. It is comprised with the formed type 2 pattern shaping | molding die 2B.

  Further, the angle γ between the dividing line S and the normal line Y of the pattern mold 2A has the same angle as the angle γ of the pattern mold 2B, and the type 1 pattern mold 2A is as shown in FIG. In addition, the dividing line S has an obtuse angle α with respect to the line X parallel to the center line, and the obtuse angle α needs to be opened at least + 0.5 ° or more. As shown in FIG. 4, both dividing lines S have an acute angle β with respect to the line X parallel to the center line, and this acute angle β is the opposite angle of Type 1, that is, −0.5 ° or more. Thus, the pattern forming die 2A and the pattern forming die 2B formed of the graphite material for the mold can be prevented from cracking.

  Next, a method for manufacturing a mold for tire vulcanization molding using the pattern molding die 2A of type 1 and the pattern molding die 2B of type 2 will be described.

  First, a molding die 1 in which various tire patterns such as a profile 3a and a groove processing 3b are formed on the surface 2a in parallel or with a draft angle on the surface 2a is formed by using a graphite material for a mold. A plurality of substantially fan-shaped pattern forming dies 2A or a plurality of substantially fan-shaped pattern forming dies 2B as described above are manufactured.

  After the plurality of pattern forming dies 2A or the pattern forming dies 2B configured as described above are first placed in the jig 4 made of metal (for example, aluminum) as shown in FIG. When the pattern forming die 2B in the form of type 2 is fitted and arranged, and then tightened to the jig 4 via a fastening member 5 such as a bolt as shown in FIG. 6, the pattern forming die 2A and the pattern forming die It is fastened and fixed in a state where both dividing lines S with 2B coincide.

  As shown in FIGS. 7 (a) and 7 (b), the jig 4 configured as described above, the pattern forming die 2A, and the pattern forming die 2B are set in a casting frame 6 and poured with a molten metal such as aluminum. The mold for vulcanization molding W is casted with Then, after the molten metal is solidified, as shown in FIGS. 8A to 8F, together with the vulcanization mold W from the casting frame 6, the assembled jig 4 and the pattern mold 2A and Remove the pattern molding die 2B, further remove the jig 4 from the pattern molding die 2A and the pattern molding die 2B, loosen the fastening members 5 such as bolts, and sequentially remove the plurality of pattern molding die 2A and the pattern molding die 2B. Finally, the pattern mold 2B is removed from the vulcanization mold W to complete the operation.

  The tire using the tire vulcanization molding die thus manufactured can be a tire having a smooth surface and a good appearance.

  As described above, by using the mold graphite material for the pattern forming dies 2A and 2B, it has excellent thermal conductivity and heat insulation, and is strong against heat shock (temperature change) and has a strong surface. It has good accuracy and can be used repeatedly.

1 is an overall perspective view of one molding die for producing a tire vulcanization molding die embodying the present invention. It is a front view of one shaping | molding die. It is an AA arrow enlarged side view of FIG. It is an AA arrow expanded side view of FIG. It is explanatory drawing of the process of assembling a type 1 pattern shaping | molding die and a type 2 pattern shaping | molding die to a jig | tool. It is a front view of the state which assembled | attached the type 1 pattern shaping | molding die and the type 2 pattern shaping | molding die to the jig | tool. (A) is a sectional view at the time of casting, in which a pattern forming die assembled to a jig is arranged on a casting frame, and (b) is a side view of (a). (A)-(f) removes the pattern shaping | molding die assembled | attached to the jig from the casting frame, a tire vulcanization mold, a jig | tool and the type 1 pattern shaping die, and the type 2 pattern shaping die, It is explanatory drawing of the process of removing sequentially.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Pattern mold 2a Surface 2A Type 1 pattern mold 2B Type 2 pattern mold 3a Profile 3b Groove processing 4 Jig W Tire mold for tire vulcanization molding 5 Fastening member 6 Casting frame S Double dividing line X Center line α Obtuse angle β Acute angle

Claims (8)

A mold for producing a tire vulcanization mold, which is a mold for producing a tire vulcanization mold by gravity casting, wherein the mold is formed using a graphite material for a mold as a raw material. . 2. The tire vulcanization mold according to claim 1, wherein the mold is configured by a plurality of pattern molds, and the dividing lines of the pattern molds are formed so as to be fitted to each other toward the mold center. Mold. The mold for a tire vulcanization mold according to claim 1 or 2, wherein a tire pattern is formed on the surface of the pattern mold in parallel or with a draft angle to the center of the mold. 4. The mold for molding a tire vulcanization mold according to claim 2, wherein the pattern mold divided into a plurality of parts is detachably attached to a jig that can be set on a casting frame. The tire processing unit according to claim 2 or 3, wherein the plurality of divided pattern forming dies are divided into a plurality of types, and the plurality of types of pattern forming dies are configured to be detachable from the jig. Mold for mold for sulfur molding. A tire profile and a groove are formed on the molding surface of the mold for producing a vulcanization mold made of a graphite material for mold, and the mold is fitted to each other with the dividing line toward the mold center. It is composed of a plurality of divided pattern molds that can be combined. After the divided pattern molds are detachably mounted on a jig, they are set in a casting frame, and then molten metal is poured into the casting frame. A method for producing a tire vulcanization mold using a molding die characterized in that after the molten metal is solidified by casting a vulcanization molding die with a jig, the molding die is removed together with a jig from the casting frame. . The tire vulcanization mold using the mold according to claim 6, wherein the plurality of divided pattern molds are detachably attached to a jig that can be set on a casting frame via a fastening member. Production method. A tire manufactured using the tire vulcanization mold manufactured according to claim 6.

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