SPARK PLUG INSULATOR PRODUCTION METHOD, INSULATOR, MOLDING DIE

Title:

SPARK PLUG INSULATOR PRODUCTION METHOD, INSULATOR, MOLDING DIE

Document Type and Number:

WIPO Patent Application WO/2016/092723

Kind Code:

A1

Abstract:

This invention suppresses the deformation of a molded body due to mold releasing. A back part molding die comprising a plurality of die portions is used, said plurality of die portions including a first die portion which forms, among the internal surface of the back part molding die, a first partial internal surface that spans one turn in the circumferential direction, and a second die portion which is disposed more to the forward extremity side in the axis line direction than the first die portion and which forms, among the internal surface of the back part molding die, a second partial internal surface that spans one turn in the circumferential direction. At mold releasing time, by starting to move the first die portion toward the back extremity side relative to the back part molded portion, and, after starting to move the first die portion, by starting to move the second die portion toward the back extremity side relative to the back part molded portion, the back part molding die is disassembled into a plurality of die portions. Alternatively, the back part molding die may comprise a plurality of die portions, each forming, among the internal surface of the back part molding die, a different portion from one another.

Inventors:

KURONO HIROKAZU (JP)
UEGAKI HIRONORI (JP)
HONDA TOSHITAKA (JP)
HAZAMA HIROYUKI (JP)
TANAKA KUNIHARU (JP)
KAWAJI HIROYUKI (JP)

Application Number:

PCT/JP2015/004823

Publication Date:

June 16, 2016

Filing Date:

September 23, 2015

Export Citation:

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Assignee:

NGK SPARK PLUG CO (JP)

International Classes:

H01T13/20; H01T21/02

Foreign References:

DE102010042155A1	2012-04-12
JP2010228342A	2010-10-14
JPH08183062A	1996-07-16
JPS63149705U	1988-10-03

Other References: