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pro vyhledávání: '"Yu. N. Tel'yanov"'
Autor:
A. F. Chamin, Yu. N. Tel'yanov
Publikováno v:
Chemical and Petroleum Engineering. 21:97-98
In the manufacture of pipe grids for shell-and-tube heat exchangers the drilling of openings represents the major volume (up to 80%) of the mechanical treatment. According to the existing technology, the boring is performed by spiral drills made of R