定義

• Sinking.  Diesinking; creating a die, not by engraving or carving, but by hubbing – pressing a hard steel pattern into a soft steel block.  See hubbing.
  This experimental medal was made of powder metals and formed by compaction and sintering. It was made for Franklin Mint. It proved the unworthiness of this process for medal manufacture.
   

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

人际关系