FIELD: machining of metals, in particular, hole drilling in heat-treated plate materials. SUBSTANCE: plate to be machined is softened in the working area of the supposed hole by spot heating; as a result, the metal strength is reduced, heating is effected sue to friction of the rotating steel rod with a flat end up to appearance of blue color on the material being machined in the drilling area; after that the material being machine is let cool down. EFFECT: facilitated procedure.
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| MANUAL SAW-SETTING PLIERS FOR WOOD-WORKING SAWS | 1999 |
|
RU2152853C1 |
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SU1834759A3 |
