WO2010029802A1 - Procédé de fabrication d’une coulée pour un moule destiné à mouler un pneumatique - Google Patents

Procédé de fabrication d’une coulée pour un moule destiné à mouler un pneumatique Download PDF

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Publication number
WO2010029802A1
WO2010029802A1 PCT/JP2009/060904 JP2009060904W WO2010029802A1 WO 2010029802 A1 WO2010029802 A1 WO 2010029802A1 JP 2009060904 W JP2009060904 W JP 2009060904W WO 2010029802 A1 WO2010029802 A1 WO 2010029802A1
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Prior art keywords
casting
mold
surface portion
manufacturing
tire
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Application number
PCT/JP2009/060904
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English (en)
Japanese (ja)
Inventor
石原　泰之
Original Assignee
株式会社ブリヂストン
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Publication date
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Priority to CN2009801356881A priority Critical patent/CN102149490A/zh
Priority to EP09812950.5A priority patent/EP2335844B1/fr
Priority to US13/059,771 priority patent/US20110174460A1/en
Publication of WO2010029802A1 publication Critical patent/WO2010029802A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers

Definitions

  • the present invention relates to a method for manufacturing a casting for a tire molding mold of a sectional mode type, and in particular, it is difficult for twisting and warping deformation of each block casting at the time of casting shrinkage, and there is little difference in shrinkage rate between the top and bottom,
  • the present invention relates to a method for manufacturing a casting for a tire molding die, which can have a relatively short molten metal solidification time and easily obtain a sound casting.
  • Tire molding dies are generally produced by casting because of the complexity of the design and the ability to cast thin plates such as sipes and blades made of dissimilar metal materials.
  • the plaster casting method is widely adopted.
  • Other reasons for adopting the gypsum casting method are (1) the ability to produce castings with melting points up to the level of aluminum alloys with high dimensional accuracy, and (2) the ease of cutting and assembly at the gypsum mold stage. (3) It is possible to cope with casting of sipe and blade with a high degree of freedom, and (4) complicated design shape can be accurately transferred by casting inversion from a rubber mold.
  • Patent Document 1 discloses a molten metal pouring method using a low pressure casting method
  • Patent Document 2 discloses a molten metal pouring method using a dedicated chute in gravity casting
  • Patent Document 3 describes gravity.
  • a molten metal pouring method using a runner surface plate that can be repeatedly used in casting is disclosed.
  • the characteristics of these methods are: (1) After casting, processing and forming a sectional mold, (2) Since the outlet is concentrated on the lower surface side, the melt solidification time is different at the top and bottom for each sectional mold. (3) Utilizing a casting frame as a cooling mold.
  • FIG. 19 illustrates a process example when a tire mold is manufactured by a sectional mold.
  • A is a top view of the ring casting 100 of a tire mold
  • B is the sectional view.
  • a tire mold is first cast, then divided into individual block castings 101 by sector division, and then the outer periphery is processed into a sectional mold. According to this method, it is possible to perform both ring-shaped simultaneous casting of a plurality of block castings and casting of one block casting.
  • JP-A-57-58968 (Claims etc.) Japanese Patent No. 2796010 (Claims etc.) JP 2007-144480 A (Claims etc.)
  • the object of the present invention is that twisting and warping deformation of each block casting hardly occur at the time of casting shrinkage, and there is little difference in shrinkage rate at the top and bottom, and even a large property can have a relatively short molten metal solidification time. It is providing the manufacturing method of the casting for tire molding dies which is easy to obtain a sound casting.
  • the present inventor has found that the above object can be achieved by adopting the following configuration, and has completed the present invention.
  • the method for producing a casting for a tire molding die of the present invention is a method for producing a casting for a tire molding die of a sectional mold type in which a mold is opened and closed by dividing into a plurality in the circumferential direction. Including a step of individually casting the divided block castings to produce them, and in this step, an upper surface portion, a lower surface portion, and circumferentially divided surfaces on both sides that surround the design surface that is a contact surface with the mold from four sides The molten metal is poured into a mold in which a cooling metal is disposed so as to continuously surround at least the design surface on the four surfaces.
  • the chillers facing each other are arranged symmetrically with respect to the four surfaces of the upper surface portion, the lower surface portion, and the circumferential dividing surfaces on both sides. Further, it is preferable that a pair of outlets for the mold is arranged symmetrically on the upper surface part and the lower surface part, or a pair of outlets for the mold is arranged symmetrically on the circumferential dividing surfaces on both sides. Furthermore, it is preferable to form a runner for supplying molten metal to the hot water outlet and / or the hot water outlet inside the cooling metal.
  • twisting and warping deformation of each block casting hardly occur at the time of casting shrinkage, and there is little difference in shrinkage rate between the upper and lower sides, and even a large property can have a relatively short molten metal solidification time, and sound. It is possible to provide a method for producing a casting for a tire molding die that is easy to obtain a casting.
  • FIG. 6 is a perspective view showing the manufacturing method of Example 2.
  • FIG. 6 is a perspective view showing the manufacturing method of Example 3.
  • FIG. 6 is a perspective view showing a manufacturing method of Comparative Example 1.
  • FIG. 10 is a perspective view showing a manufacturing method of Comparative Example 2.
  • FIG. It is explanatory drawing of a chord dimension measurement.
  • FIG. 1 (A) is a perspective view of the block casting 1 according to the first embodiment of the present invention.
  • the back surface 4 side of one circumferentially divided surface 3a is disposed on the half surface and the substantially half surface on the back surface 4 side of the other circumferentially divided surface 3b.
  • the portion where the chiller abuts is indicated by hatching.
  • the mold it is important to form the mold so that the cooling metal continuously surrounds the design surface 6 as shown.
  • part rapidly arises at the time of the molten metal solidification after casting, and the said solidified site
  • the produced block casting 1 is less likely to be deformed such as twisting and warping, and the difference in shrinkage between the upper surface portion 2a and the lower surface portion 2b is reduced.
  • FIG. 1B is a perspective view of the block casting 1 according to the second embodiment of the present invention.
  • a cooling metal is disposed on the substantially half surface on the back surface 4 side of the direction dividing surface 3b.
  • FIG. 1C is a perspective view of a block casting 1 according to the third embodiment of the present invention. Cooling metal is disposed on the design surface 6 side substantially half surface of the upper surface portion 2a of the block casting 1, the back surface 4 side substantially half surface of the lower surface portion 2b, and the entire circumferential dividing surfaces 3a and 3b on both sides.
  • the cooling metal can continuously surround the design surface 6, and as a result, the solidification of the part rapidly occurs at the time of the solidification of the molten metal after casting.
  • part functions as a restraint tool at the time of the solidification and cooling shrinkage
  • FIG. 2 (A) is a perspective view of a block casting 1 according to a fourth embodiment of the present invention.
  • the opposing chillers are symmetrical with each other. Has been placed.
  • FIG. 2 (B) is a perspective view of the block casting 1 according to the fifth embodiment of the present invention. Cooling metal on the design surface 6 side approximately half surface of the upper surface portion 2a of the block casting 1, the design surface 6 side approximately half surface of the lower surface portion 2b, and the design surface 6 side approximately half surface of the circumferentially divided surfaces 3a and 3b on both sides. By arrange
  • FIG. 2C is a perspective view of the block casting 1 according to the sixth embodiment of the present invention. Cooling metal is arranged on the back half 4 side of the upper surface 2a of the block casting 1, the back side 4 of the lower face 2b, and the back side 4 of the circumferentially divided surfaces 3a and 3b on both sides. Thus, the opposing chillers are arranged symmetrically.
  • FIG. 2 (D) is a perspective view of the block casting 1 according to the seventh embodiment of the present invention. Cooling metal is applied to the design surface 6 side approximately half surface of the upper surface portion 2a of the block casting 1, the design surface 6 side approximately half surface of the bottom surface portion 2b, and the back surface 4 side approximately half surface of the circumferentially divided surfaces 3a and 3b on both sides.
  • positioning the chillers which oppose are arrange
  • FIG. 2 (E) is a perspective view of the block casting 1 according to the eighth embodiment of the present invention. Cooling metal is arranged on the back half 4 side of the upper surface 2a of the block casting 1, the back side 4 of the bottom face 2b, and the design side 6 half of the circumferentially divided surfaces 3a and 3b on both sides. By doing so, the opposing chillers are arranged symmetrically. In each figure, the portion where the chiller abuts is indicated by hatching.
  • the cooling metal continuously surrounds the design surface 6, and thus the same effect as that of the invention according to the first embodiment can be obtained.
  • the opposing chillers are arranged symmetrically on the four surfaces of the upper surface portion 2a and the lower surface portion 2b of the block casting 1 and the circumferentially divided surfaces 3a and 3b on both sides. Accordingly, the solidification of the molten metal from the upper surface portion 2a, the lower surface portion 2b, and the circumferentially divided surfaces 3a and 3b on both sides starts symmetrically at substantially the same time, and the block casting 1 is symmetrical in the vertical and horizontal directions (arrow direction). It becomes easy to obtain characteristics.
  • the hot water 5 when aiming at a solidification form that is symmetrical in the vertical and horizontal directions (in the direction of the arrow) of the block casting 1, the hot water 5 must be installed on the back surface 4 side, and the molten metal on the back surface 4 side of the block casting 1. It is necessary to delay clotting. Therefore, it is not necessary to obtain the restraining effect of the solidification / cooling shrinkage of the entire block casting 1 by the molten metal initial solidified layer on the back surface 4, so that it is not necessary to install a cooling metal on the back surface 4 side.
  • the pair of outlets for the mold are arranged symmetrically on the upper surface part and the lower surface part, or the pair of outlets for the mold are arranged symmetrically on the circumferential dividing surfaces on both sides. Embodiments will be described.
  • FIG. 3 is a schematic view showing the arrangement of outlets with respect to the mold of the block casting 1 according to the ninth embodiment of the present invention.
  • a pair of hot water outlets 7 arranged symmetrically on the upper surface 2a and the lower surface 2b are formed on the upper surface 2a side and the lower surface 2b side edge of the design surface 6.
  • the molten metal poured from the pouring port 10 is supplied to the pouring gate 7 through the throttle port 11 and one runner 8 by the gravity casting method.
  • FIG. 4 is a schematic view showing the arrangement of outlets with respect to the mold of the block casting 1 according to the tenth embodiment of the present invention.
  • a pair of outlets 7 arranged symmetrically on the upper surface portion 2a and the lower surface portion 2b are provided at the upper surface portion 2a side and the lower surface portion 2b side edge of the design surface 6. Is formed.
  • the molten metal poured from the pouring port 10 is supplied to the pouring gate 7 through the throttle port 11 and the runner 8 divided into two hands by the gravity casting method.
  • FIG. 5 is a schematic view showing the arrangement of outlets with respect to the mold of the block casting 1 according to the eleventh embodiment of the present invention.
  • two pairs of hot water outlets 7 arranged symmetrically on the upper surface 2a and the lower surface 2b are formed on the upper surface 2a side and the lower surface 2b side edges of the design surface 6, respectively.
  • the molten metal poured from the pouring port 10 is supplied to the pouring gate 7 through the throttle port 11 and the runner 8 divided into two hands by the gravity casting method.
  • the cooling metal continuously surrounds the design surface 6, and therefore, the same effects as those of the invention according to the first embodiment can be obtained.
  • the molten metal heat input (overheating) state from the pouring outlet 7 from the start of pouring to the completion of pouring can be made even in the vertical and horizontal directions. 1 is advantageous in that it is easy to obtain symmetrical characteristics in the vertical and horizontal directions.
  • FIG. 6 is a schematic diagram showing the arrangement of outlets with respect to the mold of the block casting 1 according to the twelfth embodiment of the present invention.
  • the tap 7 is formed on the side edge of the upper surface 2 a of the design surface 6.
  • the molten metal poured from the pouring port 10 is supplied to the pouring gate 7 through the throttle port 11 and one runner 8 by the gravity casting method.
  • the tap 7 is formed inside the chiller 12, that is, through the chiller 12.
  • FIG. 7 is a schematic diagram showing the arrangement of outlets with respect to the mold of the block casting 1 according to the thirteenth embodiment of the present invention.
  • a pair of hot water outlets 7 arranged symmetrically on the upper surface 2a and the lower surface 2b are formed on the upper surface 2a side and the lower surface 2b side edge of the design surface 6.
  • the molten metal poured from the pair of pouring ports 10 is supplied to the pouring gate 7 through separate throttle ports 11 and runners 8 by gravity casting.
  • the tap 7 is formed in the inside 12 of the chiller.
  • the cooling metal 12 continuously surrounds the design surface 6, and thus the same effects as those of the invention according to the first embodiment can be obtained.
  • the pouring gate 7 is installed in the cooling metal interior 12 so that the molten metal in the pouring gate 7 is solidified and cooled immediately after pouring is completed, and the pouring gate 7 is provided as in the twelfth embodiment. Even in the case where they are not symmetrically arranged in the vertical direction, the advantage that the block casting 1 solidifies and cools substantially uniformly in the vertical and horizontal directions as in the thirteenth embodiment can be obtained.
  • FIG. 8 is a schematic diagram showing the arrangement of outlets with respect to the mold of the block casting 1 according to the fourteenth embodiment of the present invention.
  • the preferred embodiment shown is the same as the twelfth embodiment except that the runner 8 is formed inside the cooler 12.
  • FIG. 9 is a schematic diagram showing the arrangement of outlets with respect to the mold of the block casting 1 according to the fifteenth embodiment of the present invention.
  • a pair of hot water outlets 7 arranged symmetrically on the upper surface 2a and the lower surface 2b are formed on the upper surface 2a side and the lower surface 2b side edge of the design surface 6.
  • the molten metal poured from one pouring port 10 is supplied to the pouring gate 7 through a runner 8 that is divided into two portions with the throttle port 11 by gravity casting.
  • both the hot water outlet 7 and the runner 8 are formed inside the cooling metal 12.
  • the effects of the inventions according to the above twelfth and thirteenth embodiments can be further enhanced, and the trouble of having to attach and detach the external gate every time of casting can be saved. There is also an advantage that it can be done.
  • the method for manufacturing a sectional mold type casting for tire molding mold according to the present invention is characterized by a process of individually casting the divided block castings, and is characterized by other processes such as a prototype manufacturing process.
  • the steps such as the rubber mold reversal step, the gypsum mold reversal step, the mold drying step, the mold separation step, and the mold matching step can be appropriately performed according to known methods.
  • FIG. 10 is a perspective view showing a casting method of the block casting 1 of the first embodiment.
  • a cooling metal 12 is arranged on the four casting frames of the upper surface portion 2a, the lower surface portion 2b and the circumferentially divided surfaces 3a and 3b of the block casting 1 so as to continuously surround the design surface 6.
  • the cast frame surrounding the block casting 1, the runner 8, the tap 7 and the chill metal 12 was all made of a sand mold made of water glass hardened silica sand.
  • the cooling metal contact area rate of the upper surface portion 2a is 80%
  • the cooling metal contact area rate of the lower surface portion 2b is 50%
  • the cooling metal contact area of the circumferentially divided surfaces 3a and 3b is 60%.
  • a block casting 1 was produced with a casting frame and cooling metal temperature of 25 ° C. and a casting start temperature of 680 ° C.
  • AC4C aluminum alloy
  • FIG. 11 is a perspective view illustrating a casting method of the block casting 1 of the second embodiment.
  • the cooling metal 12 is symmetrically arranged so as to continuously surround the design surface 6 in the four-sided casting frame of the upper surface portion 2a, the lower surface portion 2b and the circumferentially divided surfaces 3a and 3b of the block casting. Arranged.
  • the cast frame surrounding the block casting 1, the runner 8, the tap 7 and the chill metal 12 was all made of a sand mold made of water glass hardened silica sand.
  • the cooling metal contact area ratio of the upper surface portion 2a is 50%
  • the cooling metal contact area ratio of the lower surface portion 2b is 50%
  • the cooling metal contact area of the circumferentially divided surfaces 3a and 3b is 60%.
  • a block casting was produced by setting the casting frame and cooling metal temperature to 25 ° C. and casting start temperature to 680 ° C.
  • AC4C aluminum alloy
  • FIG. 12 is a transparent perspective view showing a casting method of the block casting 1 of the third embodiment.
  • the upper surface 2a, the lower surface 2b, the circumferentially divided surfaces 3a and 3b, the runner 8, the outlet 7 and the casting frame (lower mold) 13 surrounding the cooling metal 12 are all made of cast iron. did.
  • the casting frame (upper mold) on the back side of the block casting was made of water glass hardened silica sand.
  • the runner 8 and the tap 7 were dug into the lower structure.
  • AC4C aluminum alloy
  • FIG. 13 is a perspective view showing a conventional casting method for a tire mold casting of Comparative Example 1.
  • a ring-shaped runner 18 was installed on the lower side of the ring, and a hot water outlet 17 was arranged on the top thereof.
  • the contact area ratio of the chill metal is 100% of the entire surface of the outer peripheral cylindrical surface of the ring casting, about 40% in the donut-shaped inner side of the lower plane, and 0% (no chill metal contact) in the upper surface portion 22a where the hot water 15 is generated. did.
  • a block casting was produced at a casting mold temperature and a casting frame temperature of 200 ° C. and a casting start temperature of 680 ° C.
  • AC4C aluminum alloy
  • FIG. 14 is a perspective view showing a casting method of the block casting 1 of Comparative Example 2.
  • two chillers 12 are arranged on each of the four cast frames of the upper surface portion 2a, the lower surface portion 2b and the circumferentially divided surfaces 3a and 3b of the block casting.
  • the contact area of the chillers was all 30%.
  • the block casting 1 was produced by setting the casting mold and casting frame temperature to 25 ° C. and casting start temperature to 680 ° C.
  • AC4C aluminum alloy
  • a rubber mold was manufactured by placing a wooden mold on which a tread pattern was formed in a mold and pouring a silicone rubber material into the mold.
  • the wood mold was made of synthetic wood (basic shrinkage setting: 11.5 / 1000), and the rubber mold was a gypsum-lined silicone rubber mold (rubber layer thickness 15 mm).
  • gypsum G-1 foamed gypsum made by Noritake Gypsum: 70% water mixing, 50% foaming increase
  • the design surface ⁇ 600 ⁇ 20mm, tire width dimension 195 ⁇ 30mm, casting thickness 70 ⁇
  • the basic dimensions of the tire mold casting and the manufacturing method thereof are shown in Table 1 below.
  • FIG. 15 is an explanatory diagram of the chord dimension measurement.
  • the upper chord dimension, the central chord dimension, and the lower chord dimension of each of the obtained casts for tire hardware were measured, and the average of the differences from the respective drawing dimensions was calculated.
  • the difference between the upper chord dimension and the lower chord dimension was calculated.
  • a positive value means that the casting chord dimension is larger than the drawing value.
  • a positive value means that the upper chord dimension is smaller.
  • FIG. 16 is an explanatory diagram of twist measurement.
  • difference values from theoretical dimensions were calculated at four points (A to D) in the vicinity of the upper and lower ends of the block cast product.
  • the total absolute value of the obtained difference values (
  • FIG. 17 is an explanatory diagram of circumferential warpage measurement.
  • FIG. 18 is an explanatory diagram of the measurement of warpage in the width direction.
  • the obtained results are summarized in Table 2.
  • Comparative Example 1 (conventional ring casting) has good twist, circumferential warpage, and width direction warpage characteristics (both average value and variation are small), but the difference in chord dimension between the top and bottom is the largest. It was. Further, in Comparative Example 2 (conventional block casting), although the string size difference between the upper and lower sides was small, the twisting, circumferential direction and width direction warping characteristics were poor.
  • Example 1 the string dimension difference was smaller than that of Comparative Example 1, and twisting and warping deformation could be suppressed more than Comparative Example 2. That is, it can be seen that it is possible to provide a block casting method in which twisting and warping deformation during casting shrinkage hardly occur and the shrinkage rate difference between the upper and lower dies of the sectional mold is small. Further, in Example 2, the upper and lower chord dimension difference could be further suppressed as compared with Example 1. Further, in Example 3, twisting and warping were similar to ring casting, but the difference in the upper and lower chord dimensions could be greatly improved compared to ring casting.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

La présente invention concerne un procédé de fabrication d’une coulée pour un moule destiné à mouler un pneumatique. Selon l’invention, il est peu probable que la coulée ne se gauchisse ou ne se déforme lorsqu’elle se rétrécit. Les moules supérieurs et inférieurs du moule transversal présentent une faible différence au niveau des degrés de rétrécissement. La coulée, même si elle est importante, peut être produite dans un délai de solidification du métal fondu relativement court et le procédé permet de facilement produire des coulées parfaites. L'invention concerne en outre un procédé de fabrication d’une coulée pour un moule qui convient au moulage d'un pneumatique et est du type transversal, le moule étant divisé sur sa circonférence pour permettre l’opération d’ouverture et de fermeture du moule. Le procédé comprend une étape de moulage et de production séparés de coulées de bloc individuel distinctes (1). Dans cette étape, le métal fondu est déversé dans le moule dans lequel le métal en cours refroidissement, qui entoure continuellement au moins une surface conçue de manière esthétique (6) qui est une surface de contact en contact avec le moule, est amené sur quatre surfaces qui sont une surface supérieure (2a), une surface inférieure (2b) et des surfaces séparées sur la circonférence (3a, 3b) des deux côtés de la surface supérieure et de la surface inférieure. Les quatre surfaces entourent la surface conçue de manière esthétique (6) à partir de quatre directions.
PCT/JP2009/060904 2008-09-11 2009-06-15 Procédé de fabrication d’une coulée pour un moule destiné à mouler un pneumatique WO2010029802A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2009801356881A CN102149490A (zh) 2008-09-11 2009-06-15 轮胎成型模具用铸件的制造方法
EP09812950.5A EP2335844B1 (fr) 2008-09-11 2009-06-15 Procédé de fabrication d une coulée pour un moule destiné à mouler un pneumatique
US13/059,771 US20110174460A1 (en) 2008-09-11 2009-06-15 Method of manufacturing casting for mold for molding tire

Applications Claiming Priority (2)

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JP2008-233981 2008-09-11
JP2008233981A JP5243157B2 (ja) 2008-09-11 2008-09-11 タイヤ成型金型用鋳物の製造方法

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WO2010029802A1 true WO2010029802A1 (fr) 2010-03-18

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EP (1) EP2335844B1 (fr)
JP (1) JP5243157B2 (fr)
CN (1) CN102149490A (fr)
WO (1) WO2010029802A1 (fr)

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JP2011131437A (ja) * 2009-12-22 2011-07-07 Bridgestone Corp タイヤ成型金型の製造方法

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JP6091996B2 (ja) * 2013-05-20 2017-03-08 株式会社ブリヂストン タイヤ成型用金型の製造方法
CN103551514B (zh) * 2013-11-14 2015-07-08 沈阳工业大学 大型铸钢件冒口加热易割片
JP5946492B2 (ja) * 2014-06-05 2016-07-06 住友ゴム工業株式会社 タイヤ用金型の鋳造方法及び鋳造設備
JP2018187655A (ja) * 2017-05-09 2018-11-29 株式会社ブリヂストン タイヤ用の成形モールドの製造方法
JP7415884B2 (ja) * 2020-11-12 2024-01-17 トヨタ自動車株式会社 鋳造装置及び鋳造方法

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CN102149490A (zh) 2011-08-10
JP5243157B2 (ja) 2013-07-24
EP2335844A4 (fr) 2013-11-27

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