| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for processing the cord groove hole of a die insert which prevents the biased abrasion of the outlet side end part of the inner peripheral surface of the cord groove hole of the die insert set in an extruder used for producing a tire carcass, a belt layer, etc., and makes it possible to arrange steel cords accurately for a long time and the die insert. SOLUTION: A polishing steel cord 11 is inserted into the cord groove hole 2 of the die insert 1 fixed by fixing parts 14a and 14b and moved, and only the outlet side end part 2a of the inner periphery of the cord groove hole 2 is polished smoothly. After that, the whole inner peripheral surface of the cord groove hole 2 is polished by abrasive grains. Next, the whole inner peripheral surface of the cord groove hole 2 is coated with a surface hardening film to fix a surface hardened layer firmly to the outlet side end part 2a. COPYRIGHT: (C)2008,JPO&INPIT
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