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用手锯锯钢材是钳工要掌握的基本功之一。但不少同志缺乏使用经验,直接将锯条在钢材上锯削,这样不仅锯得慢,而且锯条寿命大大缩短。因为手工锯条的材料其工作部分硬度很高,一般为HRC58～62,是很耐磨的,但一旦工作温度升到250℃时其硬度马上下降,在锯削时会有一部分机械能变成热能,使其锯缝、锯条温度升高,磨损增加,锯条很快报废。如果在锯条上或锯缝中加几滴废机油,或几滴水,既可降温,又可润滑,并可使锯条寿命提高两倍以上,锯时省力省时。
Sawing steel with a hand saw is one of the basic skills that fitters must master. However, many comrades lack of experience in using saw blades to cut sawn steel directly, thus not only sawing slowly but also shortening the life of the saw blade. Because manual saw blade material part of its high hardness, usually HRC58 ~ 62, is very wear-resistant, but once the working temperature rose to 250 ℃ when its hardness decreased immediately, there will be a part of the sawing mechanical energy into heat, Make it kerf, saw blade temperature increases, wear increases, saw blade quickly scrapped. If the saw blade or sawtooth plus a few drops of waste oil, or a few drops of water, both cooling and lubrication, and can increase the life of the saw blade more than doubled, saving time and labor-saving sawing.