To obtain a die for a perforated pipe which enables an increase of a feed rate of a workpiece between the tandem teeth of a mandrel and the increase of the threshold speed of extrusion molding.
The die 100 for the perforated pipe is constituted by building a die 1 and the mandrel 2 into a die chamber 3. The die 1 has an extrusion 11 at its center and is enclosed by a land forming the cylindrical surface of a cross-sectional shape corresponding to the external shape of the cross section of the perforated pipe 200 to be extrusion molded. The tandem teeth 23 are so dimensioned as to be coaxially arranged within the extrusion port 11. A chamfered part 7 is formed in the connecting part to a pass chamber 40 of the land. The chamfered part 7 smoothly supplies the workpiece in a hot state at a high speed from the pass chamber 40 to the extrusion space 6 and has the effect of pushing the workpiece between the teeth when the extrusion speed is improved in extrusion molding.
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FUKUOKA SHINGORO
MAIKERU ROORENSU HAIDEN
FURUKAWA ELECTRIC CO LTD
W II LTD B
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