济南汽车制造总厂铸钢厂的一条半自动高压造型线,系机械部济南铸锻机械研究所帮助设计的,从1974年正式投产以来,担负着该厂黄河牌汽车部分中小铸钢件的生产任务,两班工作制,运转一直比较正常。但由于工作环境恶劣,造型主机压实活塞难免有被铁豆、砂粒拉毛和挤伤的地方,时间一长,活塞表面被拉挤成一条条小的沟槽和凹坑,有的深达3mm,造成严重漏油以致不能正常运转,只得更换新活塞。 Jinan Automobile Manufacturing Plant of a semi-automatic high-pressure steel casting line, Department of Mechanical Casting Jinan Machinery Research Institute to help design, formally put into operation from 1974 onwards, responsible for the plant part of the Yellow River vehicle brand small steel castings production tasks , Two classes of work, functioning has been more normal. However, due to poor working conditions, modeling host compacted piston will inevitably be iron beans, grit and squeezing the sand place, over time, the piston surface is pulled into a small grooves and pits, and some deep 3mm , Causing serious oil spill so that it can not operate normally, only to replace the new piston.