초록 ▼

Method for producing an extrusion die and resulting die for making a honeycomb structure provided with axially extending separate passages. Feed passages and interconnected pooling slots are formed in a metallic die body respectively from opposed end surfaces so as to be communicated with each other

Method for producing an extrusion die and resulting die for making a honeycomb structure provided with axially extending separate passages. Feed passages and interconnected pooling slots are formed in a metallic die body respectively from opposed end surfaces so as to be communicated with each other. A metallic plate is secured to the end surface provided with the interconnected pooling slots and formed in that plate to communicate with the pooling slots are narrower interconnected extrusion slots having the same shape and size as those of walls of the desired honeycomb structure.

대표청구항 ▼

A method for producing an extrusion die to be used in forming a honeycomb structure provided with numerous axially extending passages which are separated by thin walls, comprising the steps of: preparing from a single metallic block a die body having opposing end surfaces and a shape and size corres

A method for producing an extrusion die to be used in forming a honeycomb structure provided with numerous axially extending passages which are separated by thin walls, comprising the steps of: preparing from a single metallic block a die body having opposing end surfaces and a shape and size corresponding to those desired for said extrusion die, forming numerous discrete initial feed passageways in said die body for initially receiving and feeding an extrudable material of said honeycomb structure and interconnected pooling slots for pooling and distributing said extrudable material directly fed from said feed passageways temporally, said feed passageways being formed from one of said end surfaces of said die body towards the other end surface opposed to said one end surface in an axial direction of said die body at predetermined intervals to a predetermined depth, said interconnected pooling slots being formed from said other end surface of said die body towards said one end surface thereof to the level of said predetermined depth, the inner end of each of said feed passageways being directly communicated with said pooling slots, securing a metallic plate directly to said other end surface of said die body to cover said pooling slots, and forming interconnected extrusion slots in said metallic plate so as to be respectively narrower than but in register and communicated with said interconnected pooling slots for extruding said extrudable material distributed through said pooling slots, said interconnected extrusion slots having the same shape and width as a transverse cross section of said walls of said honeycomb structure. An extrusion die for making a honeycomb structure, comprising: an integral metallic die body having two opposed surfaces from one of which a multiplicity of discrete feed passageways extend inwardly to a level of about 13 mm. to about 16 mm. toward the other of said surfaces and having in said other surface a grid network of criss-crossing pooling slots running transverse to said passageways and forming a multiplicity of intersections and being interconnected throughout said network and extending from said other surface toward said one surface to said level at which said passageways meet said slots for direct communication, said pooling slots being formed by individual columns integral with said die body, the number of said feed passageways being substantially less than the number of said pooling slot intersections, and a multiplicity of discrete metallic platelets each larger than said columns in transverse dimensions and nonintegral with said die body but respectively secured permanently to said columns and together forming a grid network of interconnected extrusion slots respectively registering on said pooling slots but having a width substantially narrower than said pooling slots.