METHOD OF PRODUCING TYRES, OF MAKING VULCANIZATION MOULDS FOR SAID TYRES, TYRES AND MOULDS THUS PRODUCED
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United States of America Patent
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N/A
Issued Date -
Dec 6, 2001
app pub date -
Jan 28, 1998
filing date -
Jan 29, 1997
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Mould parts of a mould for vehicle tyres, such as sector matrices in a centripetal mould, are made by sintering of a metal- or ceramic-based powder (3) cyclically deposited in consecutively superposed layers. Deposition of each layer is followed by sintering of the powder by a laser beam (8) moving within previously defined areas delimiting contours of the sintered laminate portion thus obtained. Movement of the laser beam (8) is managed by a programmable electronic control unit (11) in which digital information defining the three-dimensional graphic representation of the mould portion to be obtained is stored. The digital information is processed for dividing the graphic representation into superposed layers corresponding each to one of the laminate portions to be obtained by sintering of the corresponding powder layer. Thus moulds of sintered material are obtained, which are provided with inner microcavities enabling air ejection during the tyre vulcanization.
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