To provide a manufacturing method of a mouthpiece for forming a honeycomb structure, simply manufacturing the mouthpiece for forming a honeycomb structure of a hexagonal honeycomb shape with high accuracy.
In this manufacturing method of the mouthpiece for forming the honeycomb structure, a hexagonal honeycomb-shaped slit 5 is formed on one surface 7 of the plate-like mouthpiece base 2, and a backside hole 4 communicating with the slit 5 is formed on the other surface 8 of the mouthpiece base 2. A working fluid hole 3 with a bore diameter smaller than the width of the slit 5 is formed to a predetermined depth on one surface 7 of the mouthpiece base 2, and the backside hole 4 communicating with the working fluid hole 3 is formed on the other surface 8 of the mouthpiece base 2, whereby while the working fluid 10 for discharge machining is caused to flow from the other surface 8 side of the mouthpiece base 2 through the backside hole 4 and the working fluid hole 3 to one surface 7 side, one surface 7 of the mouthpiece base 2 is machined to a depth to communicate with the backside hole 4 by discharge machining, and the slit 5 of a hexagonal honeycomb shape is formed on one surface of the mouthpiece base 2.
IWADE MASANARI
HAYASHI SEIICHIRO
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