Apparatus for manufacturing a tubular honeycomb assembly with an adiabatic layer formed integrally on the peripheral wall

Claim 1

An apparatus for extruding a tubular honeycomb assembly with an adiabatic layer formed integrally on the peripheral wall comprising: a first metal-pattern body comprising a trancated conical portion in which a plurality of honeycomb shaped grooves are provided, and a flange portion which is provided integrally on one longitudinal end of the trancated conical portion, those portions of which face the respective intersecting points of the plural honeycomb shaped grooves are provided with holes each having a larger diameter than that of each corresponding intersecting point of the honeycomb shaped grooves, and which is secured to an extrusion guide pipe into which a plastic material to be shaped is successively introduced under a predetermined pressure, the plural honeycomb shaped grooves provided in the trancated conical portion of the first metal-pattern body and the holes provided in the flange portion thereof jointly acting as an extruding passageway for shaping a tubular honeycomb section of the desired tubular honeycomb assembly; a second cylindrical metal-pattern body which has at its center a trancated conical through hole disposed coaxially above the trancated conical portion of the first metal-pattern body to define therewithin a first space communicating with parts of the honeycomb shaped grooves and acting as an extruding passageway for shaping a first pipe section enclosing the outer periphery of the tubular honeycomb section, and which comprises a flange portion secured to the extrusion guide pipe together with the flange portion of the first metal-pattern body, and a trancated conical portion projected coaxially from one surface of the flange portion opposite to the extrusion guide pipe and provided with a plurality of slits in the longitudinal direction at a predetermined interval and with a plurality of slots each interposed between the adjacent ones of the plural slits, the respective lower ends of the plural slits and slots being communicated with the first space; and a stopper ring securing the first and second metal-pattern bodies through their flange portions to the extrusion guide pipe and having a trancated conical shaped through hole disposed coaxially above the trancated conical portion of the second metal-pattern body to define therewithin a second space communicating with the upper ends of the plural slots provided in the trancated conical portion of the second metal-pattern body and acting as an extruding passageway for shaping a second pipe section disposed coaxially above the first pipe section, the plural slits provided in the trancated conical portion of the second metal-pattern body having their upper ends communicated with the second space and acting as an extruding passageway for shaping a plurality of radially extended ribs interposed between the first and second pipe sections.

Claim 2

An apparatus for extruding a tubular honeycomb assembly with an adiabatic layer formed integrally on the peripheral wall comprising: a first metal-pattern body comprising a trancated conical portion in which a plurality of honeycomb shaped grooves are provided, and a flange portion which is provided integrally on one longitudinal end of the trancated conical portion, those portions of which face the respective intersecting points of the plural honeycomb shaped grooves are provided with holes each having a larger diameter than that of each corresponding intersecting point of the honeycomb shaped grooves, and which is secured to an extrusion guide pipe into which a plastic material to be shaped is successively introduced under a predetermined pressure, the plural honeycomb shaped grooves provided in the trancated conical portion of the first metal-pattern body and the holes provided in the flange portion thereof jointly acting as an extruding passageway for shaping a tubular honeycomb section of the desired tubular honeycomb assembly; a second cylindrical metal-pattern body which has at its center a trancated conical through hole disposed coaxially above the trancated conical portion of the first metal-pattern body to define therewithin a first space communicating with parts of the honeycomb shaped grooves and acting as an extruding passageway for shaping a first pipe section enclosing the outer periphery of the tubular honeycomb section, and which comprises a flange portion secured to the extrusion guide pipe together with the flange portion of the first metal-pattern body, and a trancated conical portion projected coaxially from one surface of the flange portion opposite to the extrusion guide pipe and provided with a plurality of slits in the longitudinal direction at a predetermined interval and with a plurality of slots each interposed between the adjacent ones of the plural slits, the respective lower ends of the plural slits and slots being communicated with the first space; and a stopper ring securing the first and second metal-pattern bodies through their flange portions to the extrusion guide pipe and having a trancated conical shaped through hole disposed coaxially above the trancated conical portion of the second metal-pattern body to define therewithin a second space communicating with the upper ends of the plural slots provided in the trancated conical portion of the second metal-pattern body and acting as an extruding passageway for shaping a second pipe section disposed coaxially above the first pipe section, the plural slits provided in the trancated conical portion of the second metal-pattern body having their upper ends communicated with the second space and acting as an extruding passageway for shaping a plurality of radially extended ribs interposed between the first and second pipe sections.