Abnormal machine hydraulic system analysis

2019 - machine hydraulic system anomaly analysis 05 - 23 machine hydraulic system is of great harm, damage to hydraulic equipment working surface quality ( Roughness) And machining precision, reduce the service life of hydraulic machine tools and cutting tool, and even produce waste and accidents, so must be ruled out. Machine tool hydraulic system of actuators ( The hydraulic cylinder or hydraulic motor) , often need to very low speed, such as moving a few millimeters per minute even less than 1 mm or rotation of a few revolutions per minute. At this time, often can appear obvious uneven speed, intermittent time stops, the fast and slow, the phenomenon of a jump stop, hydraulic press for this kind of phenomenon be crawling, the stability problem. Don't appear crawl phenomenon minimum speed, called the running smoothness of the critical speed. Is also a crawl, there is a difference between the failure phenomenon: regular crawl, crawl have irregular; Some crawling irregular and amplitude is big; Some reptiles at very low speed. These different crawl phenomenon, its reason is different, focusing on the surface, some is given priority to with mechanical reasons, some of the reasons of the hydraulic primarily, some is given priority to with oil into the cause of the air, some is given priority to with the reason of bad lubrication. Hydraulic press hydraulic equipment maintenance and operation, and maintenance personnel must constantly summarized, find out the reasons of crawling quickly, be ruled out. Solve the problem of hydraulic crawling from the following aspects. Focus on the moving parts of the friction state and machine movement balance: 1, poor precision guide rail, guide rail surface ( V, flat guide) Serious distortion. 2, guide surface rusty spot. Article 3, guide rail clamp set too tight, guide material large difference of dynamic and static friction factor. 4, guide research is bad, not enough points, uneven ideas. 5, on the guide rail of oil tank is not good, the depth is too shallow, runtime has worn off, the uneven open groove, groove length is too short. 6, a new hydraulic press hydraulic equipment, guide without running-in. 7, hydraulic press, hydraulic cylinder axis is not parallel with guide rail. 8, hydraulic press hydraulic cylinder body hole to detain period of rust, Local section of the crawling) And strain. 9 hole, hydraulic press, hydraulic cylinder, piston rod and the piston accuracy is poor. 10, hydraulic press, hydraulic cylinder and installation accuracy, piston, piston rod, cylinder hole and comte cylinder lid alignment is poor. 11, the hydraulic cylinder piston and cylinder head, sealed tight, blocking or too loose. 12, long downtime and oil in water ( Especially the grinding coolant) Result in some parts of the rust. 13, hydrostatic guideway choke plug, guide rail oil.