Extrusion die and method for producing extrusion die for forming a honeycomb structure
AssigneeNippon Soken, Inc.
InventorsShinichi Yamamoto, Toshihiko Ito
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Abstract
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.
Claims49
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.
A method for producing an extrusion die useful in making a honeycomb structure having numerous discrete through-holes separated by walls, comprising the steps of:
- forming in one surface of a metallic die body a network of pooling slots interconnected throughout said network and having a depth extending from said one surface inwardly toward an opposed surface to a certain level,
- securing a metallic plate directly to said one surface to cover all of said slots,
- forming through said plate a network of interconnected extrusion slots in communication with said pooling slots for extruding said walls, and
- forming numerous discrete feed passageways for initially receiving extrudable material and feeding same to said pooling slot network, said passageways extending from said opposed surface inwardly toward said one surface to the said level of said pooling slots for direct communication therewith inside said body,
- said pooling and extrusion slots being formed to cause extrudable material received by the pooling slots from said feed passageways to be spread throughout said pooling slot network so that said material can be extruded continuously through the whole of said extrusion slot network to make said walls solid.
A method for producing an extrusion die useful to make a honeycomb structure, comprising the steps of:
- forming on one surface of a metallic die body a multiplicity of discrete columns extending perpendicular from said surface and having outer ends of given size and forming a network of pooling slots interconnected throughout said network,
- forming on said outer column ends respective discrete metallic platelets each having an area larger than the respective outer column end and together forming between themselves a network of interconnected criss-crossing extrusion slots forming a multiplicity of intersections and being coextensive with said pooling slot network with the extrusion slots being substantially narrower than their respective pooling slots with which they communicate, and
- forming in said die body to a depth of about 13 mm. to about 16 mm. a multiplicity of discrete feed passageways which are substantially less in number than the number of extrusion slot intersections but substantially wider than said pooling slots and which communicate directly with said pooling slots.
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.
Dependencies are inferred from the claim text.