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各种灰鑄鉄鑄件,因为用途不同,要求鑄件表面硬度也不一样。在鑄造过程中常因鉄水成分中碳、硅含量过高;退火温度过高;鑄件某部分在澆鑄后冷却过慢等原因,造成鑄件硬度过低的現象,尤其是帶有导軌面的鑄件,如果硬度过低就会影响它的使用寿命。为了不使鑄件因硬度过低而报廢,可根据加热激冷的办法来增加它的硬度。采用的方法如下:
Casting a variety of gray cast iron, because of different uses, require the casting surface hardness is not the same. In the casting process often due to water components in the carbon, silicon content is too high; annealing temperature is too high; some parts of the casting after cooling is too slow cooling and other reasons, resulting in castings hardness is too low, especially with a cast rail surface , If the hardness is too low will affect its service life. In order not to make castings scrapped due to low hardness, according to the method of heating chill to increase its hardness. The method used is as follows: