cold forging in china history present and future dr zhen zhao prof xue yu ruan shanghai jiaotong university p r 16 sept 2005 chester uk 38 th icfg plenary meeting 14 september the racecourse part i industry general technology was promoted to be used since 1950s 1958 x at univ started research on extrusion for ferrous metal 1st successfully developed by 1962 sartorius shuttle early literatures written etc chinese published 1963 new of 1975 1976 process tool illustration these 4 books are guideline many years products parts before material brass h62
