一、概述B690型牛头刨床系液压驅动,操纵、調整方便,滑枕速度平稳,傳动功率大,能作精密的平面加工和强力切削,故在我国使用颇广。但使用以来,特别在南方温度較高的地区,均发生油溫过高、效率降低,以致夏季須停車降温或采用各种降温設备,以求恢复工作能力等現象。根据我所在某些工厂的調查,証明机床的工作油温的确很高(在70℃以上),在环境温度較高的条件下(36～37℃),Ⅲ級滑枕速度已不能作长时間 I. Overview B690 shaper hydraulic drive system, easy to adjust, smooth ram speed, transmission power, can be used for precision machining and cutting, it is quite widely used in our country. However, since it was used, especially in areas with high temperature in the south, oil temperature was too high and efficiency was reduced, so that it was necessary to stop cooling in the summer or use various cooling equipment to resume work capacity. According to the survey of some factories where I work, it proved that the working oil temperature of the machine tool is really high (above 70 ℃) and the Ⅲ grade ram speed can not be long under the high ambient temperature (36 ~ 37 ℃) between