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由于我厂是成批地生产汽车零件,为了缩短渗碳周期,更好地保证质量,采取丁先在井式炉中渗碳后用密封式保护气氛炉加热淬火。渗碳温度为920℃,工件渗碳出炉后放在冷却坑内缓冷。虽然这样工艺时间长,但生产质量还是比较稳定的。偶尔也存在着一些质量问题,现将出现的问题和解决方法分述如下。一、网状碳化物且晶粒粗大:我们认为工件渗碳后出现网状碳化物和晶粒粗大的主要原因是由于工件渗碳后冷速太慢,促使碳化物沿晶界析出,为此我厂将每台冷却井都加装了
As I plant is the production of automotive parts in batches, in order to shorten the carburizing cycle, to better ensure the quality, take Ding first in the pit furnace after carburizing with a sealed protective atmosphere furnace quenching. Carburizing temperature is 920 ℃, carburizing the workpiece after the release on the cooling pit slowly cold. Although this process a long time, but the quality of production is relatively stable. Occasionally, there are some quality problems, the problems that now appear and solutions are described below. First, the mesh carbide and coarse grains: We believe that after the workpiece carburizing mesh carbides and coarse grains is the main reason for the slow cooling carburizing the workpiece, prompting the precipitation of carbide along grain boundaries, I plant each cooling well are installed