Powder molding method and powder compression molded composite article having a rest-curve like boundary
US4419413A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1982 |
| Grant date | Dec 6, 1983 |
| Priority date | — |
| Expiry date | Feb 23, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12146
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A powder compression molding method for producing a multilayer powder compression molded article having a plurality of different material layers disposed in a compression direction utilizes relative movements between an upper punch, a lower punch, a die having a step formed therein, and two feed shoes. The powder compression molded article thus formed requires a reduced amount of a special layer. The powder compression molding method includes forming a first space by moving the die relative to the lower punch, introducing a first powder into the first space through a first feed shoe, lowering the lower punch relative to the die to form a second space so that an upper surface of the first powder on the step of the die and on the lower punch has a nonuniform height, introducing a second powder into the second space, and moving the upper punch towards the lower punch to compress the first and second powders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.