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我厂一台L6120拉床在使用一段时间后,产生了拉力不断下降的情况。经测试,拉力只达到8～11吨力,而额定拉力为20吨力。这次大修理拆开机床一检查,除发现径向活塞泵内的42只小活塞与孔配合间隙略超差之外(规定配合间隙为0.02mm,实际测得配合间隙为0.025～0.03mm之间),还发现主油缸内的四只活塞环开口间隙竟达0.5mm以上,有两只为0.8mm,大大地超过开口间隙规定(开口间隙应小于0.1mm)。可以肯定一部分压力油是经过活塞环开口间
I plant a L6120 broaching machine in use for some time, resulting in a continuous decline in tension. Tested, the tension only reached 8 to 11 tons of force, while the rated pulling force of 20 tons of force. The major overhaul of the machine apart from the inspection, in addition to the radial piston pump found within the 42 small piston and the hole with the gap slightly beyond tolerance (with the provisions of the gap is 0.02mm, the actual measured with the gap of 0.025 ~ 0.03mm ) And found that the opening clearance of the four piston rings in the main fuel tank was as high as 0.5 mm or more and two of them were 0.8 mm, greatly exceeding the provisions of the opening clearance (the opening clearance should be less than 0.1 mm). Can be sure that part of the pressure oil is through the piston ring between the openings