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一、避免由于润滑而产生摩擦热在进行精冲加工时常使用润滑油,但有的润滑油在工作温度升高时摩擦系数也会增大,从而产生摩擦热,因而不宜用于精冲。例如锭子油,只要温度稍有升高,摩擦系数也即升高。又如菜子油,当温度在100℃左右时摩擦系数很低,但在150℃对摩擦系数急剧升高。目前使用的精冲润滑油含有30％动、植物油,在200℃时摩擦系数也很低。二、使用耐压负荷高的加工油精冲加工对象多半为厚板,冲切长度较长,加工速度较快。当使用一般加工油时,油膜与厚板的破断金属接触,会使模具磨损而发热,因而精冲加工油的耐压负荷须在15公斤力/厘米~2以上。锭子油的耐压负荷为4公斤力/厘米~2,菜子油为7～8公斤力/厘米~2,均不适于作精冲加工油。
First, to avoid friction and heat due to lubrication In the process of fine blanking often use lubricants, but some lubricants in the working temperature increases the friction coefficient will increase, resulting in frictional heat, and therefore should not be used for fine blanking. For example, spindle oil, as long as the temperature rises slightly, the coefficient of friction also increases. Another example is rapeseed oil, when the temperature is about 100 ℃ low coefficient of friction, but the friction coefficient at 150 ℃ sharply increased. Currently used refined lubricating oil contains 30% of animal and vegetable oils, the coefficient of friction at 200 ℃ is also very low. Second, the use of high pressure load processing of refined oil processing objects are mostly heavy plate, punching a longer length, processing speed. When using the general processing oil, the oil film and the broken metal plate contact, the mold will wear and heat, so fine punching processing oil pressure load to be 15 kg force / cm ~ 2 or more. Spindle oil pressure load of 4 kg force / cm ~ 2, rapeseed oil 7 ~ 8 kg force / cm ~ 2, are not suitable for fine blanking processing oil.