METHOD OF MANUFACTURING SEAL RING, INJECTION MOLDING MOLD USED THEREFOR AND APPARATUS OF MANUFACTURING SEAL RING

Japanese Patent JP3835994

B2

PROBLEM TO BE SOLVED: To provide a technique for manufacturing a piston seal which decreases a process number and shows excellent cut dimension accuracy and productivity.
SOLUTION: A mandrel 2 is enclosed in a rubbery molded item W injection- molded into a bottom-possessing hollow cylindrical shape while air is blown out from a large diameter hole 9, and after the rubbery molded item W is absorbed and secured to the mandrel 2 by a negative pressure vacuum force working to a convex groove 8 and a circumferential groove 6, a whole body of the rubbery molded item W and the mandrel 2 is rotated. A cutter blade 3 cuts the rubbery molded item W from its bottom portion repeatedly moving according to a locus A into piston seals 1. The width of the circumferential groove 6 of the outer circumference of the mandrel 2 is in advance made to coincide with the width of the piston seal 1 and the tip end of the cutter blade 3 is accepted by the circumferential groove 6 whereby a mutual interference between the cutter blade 3 and the mandrel 2 is avoided.

JPS59198130	PICKING UP DEVICE FOR INJECTION MOLDING
JP2683949	[Title of Invention] Spurless Disc Mold
JP4698552	Parting lock device and mold device equipped with the device

Shinichi Ojo
Kazunori Onishi
Takeshi Matsutani
Toru Imanaka
Makoto Nozawa

JP2001119062A

October 18, 2006

April 18, 2001

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Kinugawa Rubber Industry Co., Ltd.

B29C45/26; F16J15/00; B26D3/00; B29C45/17; B29C45/44; B29K21/00; B29K105/24; B29L31/26; (IPC1-7): B29C45/17; B29C45/26; B29C45/44; //B29K21:00; B29K105:24; B29L31:26

JP58183239A
JP61049836A
JP50034668A

Tsuyoshi Hashimoto
Hiromichi Kobayashi
Tomioka Kiyoshi

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