Aluminum alloy in mold for tire and tire mold

a technology of aluminum alloy and tire mold, which is applied in the field of aluminum alloy casting and tire mold, can solve the problems of rubber-protruding tires, achieve the effects of suppressing local deformation, enhancing elastic limit strain, and improving mechanical properties of cast mold

Inactive Publication Date: 2008-09-25
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]According to the invention, the design for enhancing the elastic limit strain can be given to the casting aluminum alloy. Therefore, by using such an aluminum alloy can be improved mechanical properties of a cast mold made of the aluminum alloy, and particularly the local deformation is suppressed during the vulcanization building, and hence it is possible to prolong the service life of the mold.

Problems solved by technology

The local deformation results in the deformation of the inner face form of the mold, which brings about the deterioration of RR in the tire or the poor fitting among the mutual mold segments in the split mold and hence disadvantageously produces a rubber-protruded tire.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0044]Each of mold segments used for the vulcanization building of a passenger car tire having a tire size of 225 / 60 R15 is cast from an aluminum alloy having a chemical composition shown in Table 1 under conditions shown in Table 2. As regards the castability, the state of generating cast cavities is examined under a proper casting design. In this case, the casting design is a gravity casting with a chill type ring of one sprue.

[0045]Then, the elastic limit strain is measured with respect to the resulting molds. Furthermore, the vulcanization building of tires is conducted through the above molds under the following conditions over a long time of period to measure spue generating ratio and mold repairing cycle after the use period of one year. The measured results are shown in Table 3.

[0046]Conditions of tire vulcanization building (gas vulcanization)[0047]platen / jacket temperature: 180° C. / 180° C.[0048]initial stage of vulcanization: steam, pressure 1.67 MPa (17 kgf / cm2), 2.5 minu...

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Abstract

An aluminum alloy for a tire mold comprises Mg: 3.0-6.0 mass %, Si: 0.2-4.5 mass % and the balance being Al and inevitable impurities.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to an aluminum alloy suitable as a starting material of a tire mold used in the vulcanization building of tires, and more particularly to a casting aluminum alloy and a tire mold comprising such an aluminum alloy.[0003]2. Description of the Related Art[0004]A tire mold (hereinafter referred to as “mold” simply), particularly a so-called split mold consisting of plural mold segments is commonly made from an aluminum alloy from a viewpoint of the casting property. As a typical example of the casting aluminum alloy used in the tire mold are known AC2B, AC4C and AC7A defined in JIS H5202 (1992), which is disclosed in Non-Ferrous Metals of JIS HANDBOOK. These aluminum alloys are easy in the plastic deformation because an elastic limit strain σe is as small as 0.04% in AC2B system, 0.10% in AC4C system and 0.12% in AC7A system.[0005]In the mold made of the aluminum alloy, therefore, local deformation is...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C21/08C22C21/02
CPCB29C33/38C22C21/08B29L2030/00
Inventor YANO, MASASHI
Owner BRIDGESTONE CORP
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