Method of manufacturing extrusion die for extruding honeycomb structural body
US5728286A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 8, 1996 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Aug 8, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23H2200/30
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing an extrusion die for extruding a honeycomb structural body is disclosed. The extrusion die has a plurality of forming channels which have a shape in a traverse cross section corresponding to that of the honeycomb structural body and have a predetermined depth from a front side of the extrusion die toward a back side, and a plurality of opening holes for feeding raw materials which have a cylindrical shape extending independently from the back side toward the front side and are arranged at a cross portion and/or a straight portion of the forming channels in such a manner that each opening hole is opened and connected to the cross portion and/or straight portion of the forming channels. The method includes the steps of, inserting, into the cross portion of the forming channels, an electrode having a circular shape in a traverse cross section and a length corresponding to the depth of the forming channel, and performing an electrolytic machining by using the electrode so as to make a corner portion of a cell surrounded by the forming channels an arcuate shape in a traverse cross section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.