| 释义 |
Rockwell|ˈrɒkwɛl|
The name of Stanley P. Rockwell, 20th-cent. U.S. metallurgist, used attrib. with reference to a hardness test which he introduced, in which the depth of penetration of the material (usu. a metal) by a steel ball or a diamond cone is measured under specified conditions; hence also used to denote values of relative hardness determined by such methods.
1920Foundry Trade Jrnl. XXII. 778/2 A new hardness testing apparatus, called the Rockwell hardness tester, is now available. 1922S. P. Rockwell in Trans. Amer. Soc. Steel Treating II. 1013 The Rockwell hardness tester is at present made in three sizes. 1922Chem. Abstr. XVI. 3296 Formulas..are given for conversion from the Rockwell value to the Brinell value. 1930Engineering 19 Sept. 358/1 Rockwell hardness measurements and X-ray diffraction patterns had shown that lattice distortion could be accompanied by appreciable softening. 1945A. T. Birkby Phenolic Plastics v. 56 The V.P.N. and Rockwell ‘C’ test equivalents of this are 700–750 and 58–60 respectively. 1976Islander (Victoria, B.C.) 16 May 15/3 Get a blade with a Rockwell hardness factor of 57 to 59... Steel less than Rockwell 57–59 is too soft and won't hold a cutting edge. |